* Re: 2.4 iget5_locked port attempt to 2.4
2003-02-21 20:04 ` Jan Harkes
@ 2003-02-22 9:29 ` Oleg Drokin
2003-02-24 10:21 ` 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time) Oleg Drokin
2003-03-03 14:09 ` 2.4 iget5_locked port attempt to 2.4 Oleg Drokin
2 siblings, 0 replies; 22+ messages in thread
From: Oleg Drokin @ 2003-02-22 9:29 UTC (permalink / raw)
To: Andrew Morton, mason, sam, vs, nikita, trond.myklebust, jaharkes,
linux-kernel
Hello!
On Fri, Feb 21, 2003 at 03:04:40PM -0500, Jan Harkes wrote:
> > Ok, here is my simple attempt. I just took a patch from early 2.5
> > days by jaharkes@cs.cmu.edu ;)
> Nice to see that it is being considered for a backport to 2.4, that
> would allow me to get rid of the lock around the call to iget4.
That's because we do not want to use this kind of lock in iget for reiserfs ;)
> Why didn't you take the final version that was sent to Linus? It was
I did. I extracted these patches from bitkeeper.
> against 2.5.14, but should be pretty close for 2.4.x. You can find
Still there were lots of differences in coda and especially nfs.
> it at http://delft.aura.cs.cmu.edu/icreate/, both broken up in small
> steps, and as one big patch.
They should be the same as those accepted by Linus, no?
> > Coda changes are not tested, but look correct.
> Those Coda changes are not correct as we really need to use iget4 (or
> in the new code, iget5_locked). That patch looks like it won't even
> compile, coda_inocmp is simply removed while it is still used by the two
It compiles. At least I checked that and it compiled for me.
> calls to iget4 that you didn't replace with iget5_locked. Let alone
Hm?
Probably I sent wron patch.
> adding the inode initializer. I also don't know why you are adding an
> unused local variable to coda_replace_fid.
Ah, stupid me.
That was previous version of the patch without some rejects applied manually by me.
Look at this version below ;)
Sorry.
Bye,
Oleg
===== Documentation/filesystems/Locking 1.7 vs edited =====
--- 1.7/Documentation/filesystems/Locking Thu Dec 19 05:34:24 2002
+++ edited/Documentation/filesystems/Locking Fri Feb 21 14:19:38 2003
@@ -114,7 +114,7 @@
remount_fs: yes yes maybe (see below)
umount_begin: yes no maybe (see below)
-->read_inode() is not a method - it's a callback used in iget()/iget4().
+->read_inode() is not a method - it's a callback used in iget().
rules for mount_sem are not too nice - it is going to die and be replaced
by better scheme anyway.
===== fs/Makefile 1.16 vs edited =====
--- 1.16/fs/Makefile Thu Sep 12 04:00:00 2002
+++ edited/fs/Makefile Fri Feb 21 14:24:21 2003
@@ -7,7 +7,7 @@
O_TARGET := fs.o
-export-objs := filesystems.o open.o dcache.o buffer.o
+export-objs := filesystems.o open.o dcache.o buffer.o inode.o
mod-subdirs := nls
obj-y := open.o read_write.o devices.o file_table.o buffer.o \
===== fs/inode.c 1.36 vs edited =====
--- 1.36/fs/inode.c Thu Aug 29 07:02:23 2002
+++ edited/fs/inode.c Fri Feb 21 14:20:46 2003
@@ -17,6 +17,7 @@
#include <linux/swapctl.h>
#include <linux/prefetch.h>
#include <linux/locks.h>
+#include <linux/module.h>
/*
* New inode.c implementation.
@@ -783,7 +784,32 @@
* by hand after calling find_inode now! This simplifies iunique and won't
* add any additional branch in the common code.
*/
-static struct inode * find_inode(struct super_block * sb, unsigned long ino, struct list_head *head, find_inode_t find_actor, void *opaque)
+static struct inode * find_inode(struct super_block * sb, struct list_head *head, int (*test)(struct inode *, void *), void *data)
+{
+ struct list_head *tmp;
+ struct inode * inode;
+
+ tmp = head;
+ for (;;) {
+ tmp = tmp->next;
+ inode = NULL;
+ if (tmp == head)
+ break;
+ inode = list_entry(tmp, struct inode, i_hash);
+ if (inode->i_sb != sb)
+ continue;
+ if (!test(inode, data))
+ continue;
+ break;
+ }
+ return inode;
+}
+
+/*
+ * find_inode_fast is the fast path version of find_inode, see the comment at
+ * iget_locked for details.
+ */
+static struct inode * find_inode_fast(struct super_block * sb, struct list_head *head, unsigned long ino)
{
struct list_head *tmp;
struct inode * inode;
@@ -799,8 +825,6 @@
continue;
if (inode->i_sb != sb)
continue;
- if (find_actor && !find_actor(inode, ino, opaque))
- continue;
break;
}
return inode;
@@ -832,13 +856,28 @@
return inode;
}
+void unlock_new_inode(struct inode *inode)
+{
+ /*
+ * This is special! We do not need the spinlock
+ * when clearing I_LOCK, because we're guaranteed
+ * that nobody else tries to do anything about the
+ * state of the inode when it is locked, as we
+ * just created it (so there can be no old holders
+ * that haven't tested I_LOCK).
+ */
+ inode->i_state &= ~(I_LOCK|I_NEW);
+ wake_up(&inode->i_wait);
+}
+
+
/*
* This is called without the inode lock held.. Be careful.
*
* We no longer cache the sb_flags in i_flags - see fs.h
* -- rmk@arm.uk.linux.org
*/
-static struct inode * get_new_inode(struct super_block *sb, unsigned long ino, struct list_head *head, find_inode_t find_actor, void *opaque)
+static struct inode * get_new_inode(struct super_block *sb, struct list_head *head, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data)
{
struct inode * inode;
@@ -848,37 +887,68 @@
spin_lock(&inode_lock);
/* We released the lock, so.. */
- old = find_inode(sb, ino, head, find_actor, opaque);
+ old = find_inode(sb, head, test, data);
if (!old) {
+ if (set(inode, data))
+ goto set_failed;
+
inodes_stat.nr_inodes++;
list_add(&inode->i_list, &inode_in_use);
list_add(&inode->i_hash, head);
- inode->i_ino = ino;
- inode->i_state = I_LOCK;
+ inode->i_state = I_LOCK|I_NEW;
spin_unlock(&inode_lock);
- /* reiserfs specific hack right here. We don't
- ** want this to last, and are looking for VFS changes
- ** that will allow us to get rid of it.
- ** -- mason@suse.com
- */
- if (sb->s_op->read_inode2) {
- sb->s_op->read_inode2(inode, opaque) ;
- } else {
- sb->s_op->read_inode(inode);
- }
-
- /*
- * This is special! We do not need the spinlock
- * when clearing I_LOCK, because we're guaranteed
- * that nobody else tries to do anything about the
- * state of the inode when it is locked, as we
- * just created it (so there can be no old holders
- * that haven't tested I_LOCK).
+ /* Return the locked inode with I_NEW set, the
+ * caller is responsible for filling in the contents
*/
- inode->i_state &= ~I_LOCK;
- wake_up(&inode->i_wait);
+ return inode;
+ }
+
+ /*
+ * Uhhuh, somebody else created the same inode under
+ * us. Use the old inode instead of the one we just
+ * allocated.
+ */
+ __iget(old);
+ spin_unlock(&inode_lock);
+ destroy_inode(inode);
+ inode = old;
+ wait_on_inode(inode);
+ }
+ return inode;
+set_failed:
+ spin_unlock(&inode_lock);
+ destroy_inode(inode);
+ return NULL;
+}
+
+/*
+ * get_new_inode_fast is the fast path version of get_new_inode, see the
+ * comment at iget_locked for details.
+ */
+static struct inode * get_new_inode_fast(struct super_block *sb, struct list_head *head, unsigned long ino)
+{
+ struct inode * inode;
+
+ inode = alloc_inode(sb);
+ if (inode) {
+ struct inode * old;
+
+ spin_lock(&inode_lock);
+ /* We released the lock, so.. */
+ old = find_inode_fast(sb, head, ino);
+ if (!old) {
+ inode->i_ino = ino;
+ inodes_stat.nr_inodes++;
+ list_add(&inode->i_list, &inode_in_use);
+ list_add(&inode->i_hash, head);
+ inode->i_state = I_LOCK|I_NEW;
+ spin_unlock(&inode_lock);
+
+ /* Return the locked inode with I_NEW set, the
+ * caller is responsible for filling in the contents
+ */
return inode;
}
@@ -896,9 +966,9 @@
return inode;
}
-static inline unsigned long hash(struct super_block *sb, unsigned long i_ino)
+static inline unsigned long hash(struct super_block *sb, unsigned long hashval)
{
- unsigned long tmp = i_ino + ((unsigned long) sb / L1_CACHE_BYTES);
+ unsigned long tmp = hashval + ((unsigned long) sb / L1_CACHE_BYTES);
tmp = tmp + (tmp >> I_HASHBITS);
return tmp & I_HASHMASK;
}
@@ -930,7 +1000,8 @@
retry:
if (counter > max_reserved) {
head = inode_hashtable + hash(sb,counter);
- inode = find_inode(sb, res = counter++, head, NULL, NULL);
+ res = counter++;
+ inode = find_inode_fast(sb, head, res);
if (!inode) {
spin_unlock(&inode_lock);
return res;
@@ -958,14 +1029,18 @@
return inode;
}
-
-struct inode *iget4(struct super_block *sb, unsigned long ino, find_inode_t find_actor, void *opaque)
+/*
+ * This is iget without the read_inode portion of get_new_inode
+ * the filesystem gets back a new locked and hashed inode and gets
+ * to fill it in before unlocking it via unlock_new_inode().
+ */
+struct inode *iget5_locked(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data)
{
- struct list_head * head = inode_hashtable + hash(sb,ino);
+ struct list_head * head = inode_hashtable + hash(sb, hashval);
struct inode * inode;
spin_lock(&inode_lock);
- inode = find_inode(sb, ino, head, find_actor, opaque);
+ inode = find_inode(sb, head, test, data);
if (inode) {
__iget(inode);
spin_unlock(&inode_lock);
@@ -978,22 +1053,57 @@
* get_new_inode() will do the right thing, re-trying the search
* in case it had to block at any point.
*/
- return get_new_inode(sb, ino, head, find_actor, opaque);
+ return get_new_inode(sb, head, test, set, data);
}
+/*
+ * Because most filesystems are based on 32-bit unique inode numbers some
+ * functions are duplicated to keep iget_locked as a fast path. We can avoid
+ * unnecessary pointer dereferences and function calls for this specific
+ * case. The duplicated functions (find_inode_fast and get_new_inode_fast)
+ * have the same pre- and post-conditions as their original counterparts.
+ */
+struct inode *iget_locked(struct super_block *sb, unsigned long ino)
+{
+ struct list_head * head = inode_hashtable + hash(sb, ino);
+ struct inode * inode;
+
+ spin_lock(&inode_lock);
+ inode = find_inode_fast(sb, head, ino);
+ if (inode) {
+ __iget(inode);
+ spin_unlock(&inode_lock);
+ wait_on_inode(inode);
+ return inode;
+ }
+ spin_unlock(&inode_lock);
+
+ /*
+ * get_new_inode_fast() will do the right thing, re-trying the search
+ * in case it had to block at any point.
+ */
+ return get_new_inode_fast(sb, head, ino);
+}
+
+EXPORT_SYMBOL(iget5_locked);
+EXPORT_SYMBOL(iget_locked);
+EXPORT_SYMBOL(unlock_new_inode);
+
/**
- * insert_inode_hash - hash an inode
+ * __insert_inode_hash - hash an inode
* @inode: unhashed inode
+ * @hashval: unsigned long value used to locate this object in the
+ * inode_hashtable.
*
* Add an inode to the inode hash for this superblock. If the inode
* has no superblock it is added to a separate anonymous chain.
*/
-void insert_inode_hash(struct inode *inode)
+void __insert_inode_hash(struct inode *inode, unsigned long hashval)
{
struct list_head *head = &anon_hash_chain;
if (inode->i_sb)
- head = inode_hashtable + hash(inode->i_sb, inode->i_ino);
+ head = inode_hashtable + hash(inode->i_sb, hashval);
spin_lock(&inode_lock);
list_add(&inode->i_hash, head);
spin_unlock(&inode_lock);
===== fs/coda/cnode.c 1.8 vs edited =====
--- 1.8/fs/coda/cnode.c Wed May 29 19:20:33 2002
+++ edited/fs/coda/cnode.c Fri Feb 21 18:35:03 2003
@@ -27,11 +27,6 @@
return 1;
}
-static int coda_inocmp(struct inode *inode, unsigned long ino, void *opaque)
-{
- return (coda_fideq((ViceFid *)opaque, &(ITOC(inode)->c_fid)));
-}
-
static struct inode_operations coda_symlink_inode_operations = {
readlink: page_readlink,
follow_link: page_follow_link,
@@ -62,29 +57,46 @@
init_special_inode(inode, inode->i_mode, attr->va_rdev);
}
+static int coda_test_inode(struct inode *inode, void *data)
+{
+ ViceFid *fid = (ViceFid *)data;
+ return coda_fideq(&(ITOC(inode)->c_fid), fid);
+}
+
+static int coda_set_inode(struct inode *inode, void *data)
+{
+ ViceFid *fid = (ViceFid *)data;
+ ITOC(inode)->c_fid = *fid;
+ return 0;
+}
+
+static int coda_fail_inode(struct inode *inode, void *data)
+{
+ return -1;
+}
+
struct inode * coda_iget(struct super_block * sb, ViceFid * fid,
struct coda_vattr * attr)
{
struct inode *inode;
struct coda_inode_info *cii;
- ino_t ino = coda_f2i(fid);
struct coda_sb_info *sbi = coda_sbp(sb);
+ unsigned long hash = coda_f2i(fid);
- down(&sbi->sbi_iget4_mutex);
- inode = iget4(sb, ino, coda_inocmp, fid);
+ inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
if ( !inode ) {
- CDEBUG(D_CNODE, "coda_iget: no inode\n");
- up(&sbi->sbi_iget4_mutex);
return ERR_PTR(-ENOMEM);
}
- /* check if the inode is already initialized */
- cii = ITOC(inode);
- if (coda_isnullfid(&cii->c_fid))
- /* new, empty inode found... initializing */
- cii->c_fid = *fid;
- up(&sbi->sbi_iget4_mutex);
+ if (inode->i_state & I_NEW) {
+ cii = ITOC(inode);
+ /* we still need to set i_ino for things like stat(2) */
+ inode->i_ino = hash;
+ list_add(&cii->c_cilist, &sbi->sbi_cihead);
+ unlock_new_inode(inode);
+ }
+
/* always replace the attributes, type might have changed */
coda_fill_inode(inode, attr);
@@ -129,6 +141,7 @@
struct ViceFid *newfid)
{
struct coda_inode_info *cii;
+ unsigned long hash = coda_f2i(newfid);
cii = ITOC(inode);
@@ -139,17 +152,16 @@
/* XXX we probably need to hold some lock here! */
remove_inode_hash(inode);
cii->c_fid = *newfid;
- inode->i_ino = coda_f2i(newfid);
- insert_inode_hash(inode);
+ inode->i_ino = hash;
+ __insert_inode_hash(inode, hash);
}
/* convert a fid to an inode. */
struct inode *coda_fid_to_inode(ViceFid *fid, struct super_block *sb)
{
- ino_t nr;
+
struct inode *inode;
- struct coda_inode_info *cii;
- struct coda_sb_info *sbi;
+ unsigned long hash = coda_f2i(fid);
if ( !sb ) {
printk("coda_fid_to_inode: no sb!\n");
@@ -158,47 +170,29 @@
CDEBUG(D_INODE, "%s\n", coda_f2s(fid));
- sbi = coda_sbp(sb);
- nr = coda_f2i(fid);
- down(&sbi->sbi_iget4_mutex);
- inode = iget4(sb, nr, coda_inocmp, fid);
- if ( !inode ) {
- printk("coda_fid_to_inode: null from iget, sb %p, nr %ld.\n",
- sb, (long)nr);
- goto out_unlock;
- }
-
- cii = ITOC(inode);
+ inode = iget5_locked(sb, hash, coda_test_inode, coda_fail_inode, fid);
+ if ( !inode )
+ return NULL;
- /* The inode could already be purged due to memory pressure */
- if (coda_isnullfid(&cii->c_fid)) {
- inode->i_nlink = 0;
- iput(inode);
- goto out_unlock;
- }
+ /* we should never see newly created inodes because we intentionally
+ * fail in the initialization callback */
+ BUG_ON(inode->i_state & I_NEW);
CDEBUG(D_INODE, "found %ld\n", inode->i_ino);
- up(&sbi->sbi_iget4_mutex);
return inode;
-
-out_unlock:
- up(&sbi->sbi_iget4_mutex);
- return NULL;
}
/* the CONTROL inode is made without asking attributes from Venus */
int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
{
- int error = 0;
+ int error = -ENOMEM;
*inode = iget(sb, CTL_INO);
- if ( *inode ) {
+ if (*inode) {
(*inode)->i_op = &coda_ioctl_inode_operations;
(*inode)->i_fop = &coda_ioctl_operations;
(*inode)->i_mode = 0444;
error = 0;
- } else {
- error = -ENOMEM;
}
return error;
===== fs/coda/inode.c 1.9 vs edited =====
--- 1.9/fs/coda/inode.c Wed May 29 19:17:41 2002
+++ edited/fs/coda/inode.c Fri Feb 21 18:35:58 2003
@@ -34,7 +34,6 @@
/* VFS super_block ops */
static struct super_block *coda_read_super(struct super_block *, void *, int);
-static void coda_read_inode(struct inode *);
static void coda_clear_inode(struct inode *);
static void coda_put_super(struct super_block *);
static int coda_statfs(struct super_block *sb, struct statfs *buf);
@@ -42,7 +41,6 @@
/* exported operations */
struct super_operations coda_super_operations =
{
- read_inode: coda_read_inode,
clear_inode: coda_clear_inode,
put_super: coda_put_super,
statfs: coda_statfs,
@@ -179,24 +177,6 @@
printk("Coda: Bye bye.\n");
kfree(sbi);
-}
-
-/* all filling in of inodes postponed until lookup */
-static void coda_read_inode(struct inode *inode)
-{
- struct coda_sb_info *sbi = coda_sbp(inode->i_sb);
- struct coda_inode_info *cii;
-
- if (!sbi) BUG();
-
- cii = ITOC(inode);
- if (!coda_isnullfid(&cii->c_fid)) {
- printk("coda_read_inode: initialized inode");
- return;
- }
-
- cii->c_mapcount = 0;
- list_add(&cii->c_cilist, &sbi->sbi_cihead);
}
static void coda_clear_inode(struct inode *inode)
===== fs/nfs/inode.c 1.18 vs edited =====
--- 1.18/fs/nfs/inode.c Thu Aug 15 05:05:32 2002
+++ edited/fs/nfs/inode.c Fri Feb 21 14:44:06 2003
@@ -45,7 +45,6 @@
void nfs_zap_caches(struct inode *);
static void nfs_invalidate_inode(struct inode *);
-static void nfs_read_inode(struct inode *);
static void nfs_write_inode(struct inode *,int);
static void nfs_delete_inode(struct inode *);
static void nfs_put_super(struct super_block *);
@@ -55,7 +54,6 @@
static int nfs_show_options(struct seq_file *, struct vfsmount *);
static struct super_operations nfs_sops = {
- read_inode: nfs_read_inode,
write_inode: nfs_write_inode,
delete_inode: nfs_delete_inode,
put_super: nfs_put_super,
@@ -634,7 +632,7 @@
* do this once. (We don't allow inodes to change types.)
*/
if (inode->i_mode == 0) {
- NFS_FILEID(inode) = fattr->fileid;
+// NFS_FILEID(inode) = fattr->fileid;
inode->i_mode = fattr->mode;
/* Why so? Because we want revalidate for devices/FIFOs, and
* that's precisely what we have in nfs_file_inode_operations.
@@ -650,9 +648,9 @@
inode->i_op = &nfs_symlink_inode_operations;
else
init_special_inode(inode, inode->i_mode, fattr->rdev);
- memcpy(&inode->u.nfs_i.fh, fh, sizeof(inode->u.nfs_i.fh));
+// memcpy(&inode->u.nfs_i.fh, fh, sizeof(inode->u.nfs_i.fh));
}
- nfs_refresh_inode(inode, fattr);
+// nfs_refresh_inode(inode, fattr);
}
struct nfs_find_desc {
@@ -667,7 +665,7 @@
* i_ino.
*/
static int
-nfs_find_actor(struct inode *inode, unsigned long ino, void *opaque)
+nfs_find_actor(struct inode *inode, void *opaque)
{
struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
struct nfs_fh *fh = desc->fh;
@@ -685,6 +683,18 @@
return 1;
}
+static int
+nfs_init_locked(struct inode *inode, void *opaque)
+{
+ struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
+ struct nfs_fh *fh = desc->fh;
+ struct nfs_fattr *fattr = desc->fattr;
+
+ NFS_FILEID(inode) = fattr->fileid;
+ memcpy(NFS_FH(inode), fh, sizeof(struct nfs_fh));
+ return 0;
+}
+
/*
* This is our own version of iget that looks up inodes by file handle
* instead of inode number. We use this technique instead of using
@@ -712,7 +722,7 @@
{
struct nfs_find_desc desc = { fh, fattr };
struct inode *inode = NULL;
- unsigned long ino;
+ unsigned long hash;
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
goto out_no_inode;
@@ -722,12 +732,17 @@
goto out_no_inode;
}
- ino = nfs_fattr_to_ino_t(fattr);
+ hash = nfs_fattr_to_ino_t(fattr);
- if (!(inode = iget4(sb, ino, nfs_find_actor, &desc)))
+ if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
goto out_no_inode;
- nfs_fill_inode(inode, fh, fattr);
+ if (inode->i_state & I_NEW) {
+ inode->i_ino = hash;
+ nfs_fill_inode(inode, fh, fattr);
+ unlock_new_inode(inode);
+ } else
+ nfs_refresh_inode(inode, fattr);
dprintk("NFS: __nfs_fhget(%x/%Ld ct=%d)\n",
inode->i_dev, (long long)NFS_FILEID(inode),
atomic_read(&inode->i_count));
===== fs/reiserfs/inode.c 1.42 vs edited =====
--- 1.42/fs/reiserfs/inode.c Thu Feb 13 15:42:42 2003
+++ edited/fs/reiserfs/inode.c Fri Feb 21 14:29:42 2003
@@ -30,7 +30,7 @@
lock_kernel() ;
/* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
- if (INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
+ if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
down (&inode->i_sem);
journal_begin(&th, inode->i_sb, jbegin_count) ;
@@ -887,7 +887,7 @@
// item version directly
//
-// called by read_inode
+// called by read_locked_inode
static void init_inode (struct inode * inode, struct path * path)
{
struct buffer_head * bh;
@@ -1127,27 +1127,24 @@
make_bad_inode(inode);
}
-void reiserfs_read_inode(struct inode *inode) {
- reiserfs_make_bad_inode(inode) ;
+int reiserfs_init_locked_inode (struct inode * inode, void *p)
+{
+ struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p ;
+ inode->i_ino = args->objectid;
+ INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
+ return 0;
}
-
/* looks for stat data in the tree, and fills up the fields of in-core
inode stat data fields */
-void reiserfs_read_inode2 (struct inode * inode, void *p)
+void reiserfs_read_locked_inode (struct inode * inode, struct reiserfs_iget_args *args)
{
INITIALIZE_PATH (path_to_sd);
struct cpu_key key;
- struct reiserfs_iget4_args *args = (struct reiserfs_iget4_args *)p ;
unsigned long dirino;
int retval;
- if (!p) {
- reiserfs_make_bad_inode(inode) ;
- return;
- }
-
- dirino = args->objectid ;
+ dirino = args->dirid ;
/* set version 1, version 2 could be used too, because stat data
key is the same in both versions */
@@ -1160,7 +1157,7 @@
/* look for the object's stat data */
retval = search_item (inode->i_sb, &key, &path_to_sd);
if (retval == IO_ERROR) {
- reiserfs_warning ("vs-13070: reiserfs_read_inode2: "
+ reiserfs_warning ("vs-13070: reiserfs_read_locked_inode: "
"i/o failure occurred trying to find stat data of %K\n",
&key);
reiserfs_make_bad_inode(inode) ;
@@ -1192,7 +1189,7 @@
during mount (fs/reiserfs/super.c:finish_unfinished()). */
if( ( inode -> i_nlink == 0 ) &&
! inode -> i_sb -> u.reiserfs_sb.s_is_unlinked_ok ) {
- reiserfs_warning( "vs-13075: reiserfs_read_inode2: "
+ reiserfs_warning( "vs-13075: reiserfs_read_locked_inode: "
"dead inode read from disk %K. "
"This is likely to be race with knfsd. Ignore\n",
&key );
@@ -1204,38 +1201,43 @@
}
/**
- * reiserfs_find_actor() - "find actor" reiserfs supplies to iget4().
+ * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
*
* @inode: inode from hash table to check
- * @inode_no: inode number we are looking for
- * @opaque: "cookie" passed to iget4(). This is &reiserfs_iget4_args.
+ * @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
*
- * This function is called by iget4() to distinguish reiserfs inodes
+ * This function is called by iget5_locked() to distinguish reiserfs inodes
* having the same inode numbers. Such inodes can only exist due to some
* error condition. One of them should be bad. Inodes with identical
* inode numbers (objectids) are distinguished by parent directory ids.
*
*/
-static int reiserfs_find_actor( struct inode *inode,
- unsigned long inode_no, void *opaque )
+int reiserfs_find_actor( struct inode *inode, void *opaque )
{
- struct reiserfs_iget4_args *args;
+ struct reiserfs_iget_args *args;
args = opaque;
/* args is already in CPU order */
- return le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args -> objectid;
+ return (inode->i_ino == args->objectid) &&
+ (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
}
struct inode * reiserfs_iget (struct super_block * s, const struct cpu_key * key)
{
struct inode * inode;
- struct reiserfs_iget4_args args ;
+ struct reiserfs_iget_args args ;
- args.objectid = key->on_disk_key.k_dir_id ;
- inode = iget4 (s, key->on_disk_key.k_objectid,
- reiserfs_find_actor, (void *)(&args));
+ args.objectid = key->on_disk_key.k_objectid ;
+ args.dirid = key->on_disk_key.k_dir_id ;
+ inode = iget5_locked (s, key->on_disk_key.k_objectid,
+ reiserfs_find_actor, reiserfs_init_locked_inode, (void *)(&args));
if (!inode)
return ERR_PTR(-ENOMEM) ;
+
+ if (inode->i_state & I_NEW) {
+ reiserfs_read_locked_inode(inode, &args);
+ unlock_new_inode(inode);
+ }
if (comp_short_keys (INODE_PKEY (inode), key) || is_bad_inode (inode)) {
/* either due to i/o error or a stale NFS handle */
===== fs/reiserfs/super.c 1.27 vs edited =====
--- 1.27/fs/reiserfs/super.c Wed Oct 30 19:42:36 2002
+++ edited/fs/reiserfs/super.c Fri Feb 21 14:28:06 2003
@@ -381,8 +381,6 @@
struct super_operations reiserfs_sops =
{
- read_inode: reiserfs_read_inode,
- read_inode2: reiserfs_read_inode2,
write_inode: reiserfs_write_inode,
dirty_inode: reiserfs_dirty_inode,
delete_inode: reiserfs_delete_inode,
@@ -1117,7 +1115,7 @@
int old_format = 0;
unsigned long blocks;
int jinit_done = 0 ;
- struct reiserfs_iget4_args args ;
+ struct reiserfs_iget_args args ;
int old_magic;
struct reiserfs_super_block * rs;
@@ -1194,11 +1192,17 @@
printk("clm-7000: Detected readonly device, marking FS readonly\n") ;
s->s_flags |= MS_RDONLY ;
}
- args.objectid = REISERFS_ROOT_PARENT_OBJECTID ;
- root_inode = iget4 (s, REISERFS_ROOT_OBJECTID, 0, (void *)(&args));
+ args.objectid = REISERFS_ROOT_OBJECTID ;
+ args.dirid = REISERFS_ROOT_PARENT_OBJECTID ;
+ root_inode = iget5_locked (s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor, reiserfs_init_locked_inode, (void *)(&args));
if (!root_inode) {
printk ("reiserfs_read_super: get root inode failed\n");
goto error;
+ }
+
+ if (root_inode->i_state & I_NEW) {
+ reiserfs_read_locked_inode(root_inode, &args);
+ unlock_new_inode(root_inode);
}
s->s_root = d_alloc_root(root_inode);
===== include/linux/fs.h 1.74 vs edited =====
--- 1.74/include/linux/fs.h Sat Jan 4 06:09:16 2003
+++ edited/include/linux/fs.h Fri Feb 21 15:18:40 2003
@@ -885,13 +885,6 @@
void (*read_inode) (struct inode *);
- /* reiserfs kludge. reiserfs needs 64 bits of information to
- ** find an inode. We are using the read_inode2 call to get
- ** that information. We don't like this, and are waiting on some
- ** VFS changes for the real solution.
- ** iget4 calls read_inode2, iff it is defined
- */
- void (*read_inode2) (struct inode *, void *) ;
void (*dirty_inode) (struct inode *);
void (*write_inode) (struct inode *, int);
void (*put_inode) (struct inode *);
@@ -940,6 +933,7 @@
#define I_LOCK 8
#define I_FREEING 16
#define I_CLEAR 32
+#define I_NEW 64
#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
@@ -1378,19 +1372,32 @@
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
-typedef int (*find_inode_t)(struct inode *, unsigned long, void *);
-extern struct inode * iget4(struct super_block *, unsigned long, find_inode_t, void *);
+extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
+extern struct inode * iget_locked(struct super_block *, unsigned long);
+extern void unlock_new_inode(struct inode *);
+
static inline struct inode *iget(struct super_block *sb, unsigned long ino)
{
- return iget4(sb, ino, NULL, NULL);
+ struct inode *inode = iget_locked(sb, ino);
+
+ if (inode && (inode->i_state & I_NEW)) {
+ sb->s_op->read_inode(inode);
+ unlock_new_inode(inode);
+ }
+
+ return inode;
}
extern void clear_inode(struct inode *);
extern struct inode *new_inode(struct super_block *sb);
extern void remove_suid(struct inode *inode);
-extern void insert_inode_hash(struct inode *);
+extern void __insert_inode_hash(struct inode *, unsigned long hashval);
extern void remove_inode_hash(struct inode *);
+static inline void insert_inode_hash(struct inode *inode) {
+ __insert_inode_hash(inode, inode->i_ino);
+}
+
extern struct file * get_empty_filp(void);
extern void file_move(struct file *f, struct list_head *list);
extern struct buffer_head * get_hash_table(kdev_t, int, int);
===== include/linux/reiserfs_fs.h 1.26 vs edited =====
--- 1.26/include/linux/reiserfs_fs.h Mon Jan 20 13:19:30 2003
+++ edited/include/linux/reiserfs_fs.h Fri Feb 21 15:20:00 2003
@@ -1478,8 +1478,9 @@
#define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)))
#define PUT_B_I_POS_UNFM_POINTER(bh,ih,pos, val) do {*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)) = cpu_to_le32(val); } while (0)
-struct reiserfs_iget4_args {
+struct reiserfs_iget_args {
__u32 objectid ;
+ __u32 dirid ;
} ;
/***************************************************************************/
@@ -1730,8 +1731,9 @@
/* inode.c */
-void reiserfs_read_inode (struct inode * inode) ;
-void reiserfs_read_inode2(struct inode * inode, void *p) ;
+void reiserfs_read_locked_inode(struct inode * inode, struct reiserfs_iget_args *args) ;
+int reiserfs_find_actor(struct inode * inode, void *p) ;
+int reiserfs_init_locked_inode(struct inode * inode, void *p) ;
void reiserfs_delete_inode (struct inode * inode);
void reiserfs_write_inode (struct inode * inode, int) ;
struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, __u32 *data,
===== kernel/ksyms.c 1.67 vs edited =====
--- 1.67/kernel/ksyms.c Tue Oct 1 22:34:41 2002
+++ edited/kernel/ksyms.c Fri Feb 21 14:19:50 2003
@@ -140,7 +140,6 @@
EXPORT_SYMBOL(fget);
EXPORT_SYMBOL(igrab);
EXPORT_SYMBOL(iunique);
-EXPORT_SYMBOL(iget4);
EXPORT_SYMBOL(iput);
EXPORT_SYMBOL(inode_init_once);
EXPORT_SYMBOL(force_delete);
@@ -528,7 +527,7 @@
EXPORT_SYMBOL(read_ahead);
EXPORT_SYMBOL(get_hash_table);
EXPORT_SYMBOL(new_inode);
-EXPORT_SYMBOL(insert_inode_hash);
+EXPORT_SYMBOL(__insert_inode_hash);
EXPORT_SYMBOL(remove_inode_hash);
EXPORT_SYMBOL(buffer_insert_list);
EXPORT_SYMBOL(make_bad_inode);
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time)
2003-02-21 20:04 ` Jan Harkes
2003-02-22 9:29 ` Oleg Drokin
@ 2003-02-24 10:21 ` Oleg Drokin
2003-02-24 16:50 ` Trond Myklebust
2003-03-03 14:09 ` 2.4 iget5_locked port attempt to 2.4 Oleg Drokin
2 siblings, 1 reply; 22+ messages in thread
From: Oleg Drokin @ 2003-02-24 10:21 UTC (permalink / raw)
To: Andrew Morton, vs, nikita, trond.myklebust, jaharkes,
linux-kernel
Hello!
Ok, here's iget5_locked backport version that works for me.
NFS client works the same way as unpatched 2.4.21-pre4 from
current bk tree.
(ie with it I still ocasionally see fsx produsing "short read" or
"Size error: expected 0x1b9ac stat 0x1b9ac seek 0x23078" or
"read i/o error". fsstress comsistently produces tons of
"RPC request reserved 1144 but used XXXX" kind of messages
with and without this patch. (server is vanilla 2.4.20)).
Coda changes are verified to compile, but since I do not have coda
server, I cannot test the changes.
Reiserfs changes are also seems to be working.
Original patch was from Jan Harkes <jaharkes@cs.cmu.edu>, and was applied
somewhere at the beginning of 2.5 development.
It still would be nice if someone more knowledgeable in NFS client code will
review the changes (and the same is true for Coda of course).
Bye,
Oleg
===== Documentation/filesystems/Locking 1.7 vs edited =====
--- 1.7/Documentation/filesystems/Locking Thu Dec 19 05:34:24 2002
+++ edited/Documentation/filesystems/Locking Fri Feb 21 14:19:38 2003
@@ -114,7 +114,7 @@
remount_fs: yes yes maybe (see below)
umount_begin: yes no maybe (see below)
-->read_inode() is not a method - it's a callback used in iget()/iget4().
+->read_inode() is not a method - it's a callback used in iget().
rules for mount_sem are not too nice - it is going to die and be replaced
by better scheme anyway.
===== fs/Makefile 1.16 vs edited =====
--- 1.16/fs/Makefile Thu Sep 12 04:00:00 2002
+++ edited/fs/Makefile Fri Feb 21 14:24:21 2003
@@ -7,7 +7,7 @@
O_TARGET := fs.o
-export-objs := filesystems.o open.o dcache.o buffer.o
+export-objs := filesystems.o open.o dcache.o buffer.o inode.o
mod-subdirs := nls
obj-y := open.o read_write.o devices.o file_table.o buffer.o \
===== fs/inode.c 1.36 vs edited =====
--- 1.36/fs/inode.c Thu Aug 29 07:02:23 2002
+++ edited/fs/inode.c Fri Feb 21 14:20:46 2003
@@ -17,6 +17,7 @@
#include <linux/swapctl.h>
#include <linux/prefetch.h>
#include <linux/locks.h>
+#include <linux/module.h>
/*
* New inode.c implementation.
@@ -783,7 +784,32 @@
* by hand after calling find_inode now! This simplifies iunique and won't
* add any additional branch in the common code.
*/
-static struct inode * find_inode(struct super_block * sb, unsigned long ino, struct list_head *head, find_inode_t find_actor, void *opaque)
+static struct inode * find_inode(struct super_block * sb, struct list_head *head, int (*test)(struct inode *, void *), void *data)
+{
+ struct list_head *tmp;
+ struct inode * inode;
+
+ tmp = head;
+ for (;;) {
+ tmp = tmp->next;
+ inode = NULL;
+ if (tmp == head)
+ break;
+ inode = list_entry(tmp, struct inode, i_hash);
+ if (inode->i_sb != sb)
+ continue;
+ if (!test(inode, data))
+ continue;
+ break;
+ }
+ return inode;
+}
+
+/*
+ * find_inode_fast is the fast path version of find_inode, see the comment at
+ * iget_locked for details.
+ */
+static struct inode * find_inode_fast(struct super_block * sb, struct list_head *head, unsigned long ino)
{
struct list_head *tmp;
struct inode * inode;
@@ -799,8 +825,6 @@
continue;
if (inode->i_sb != sb)
continue;
- if (find_actor && !find_actor(inode, ino, opaque))
- continue;
break;
}
return inode;
@@ -832,13 +856,28 @@
return inode;
}
+void unlock_new_inode(struct inode *inode)
+{
+ /*
+ * This is special! We do not need the spinlock
+ * when clearing I_LOCK, because we're guaranteed
+ * that nobody else tries to do anything about the
+ * state of the inode when it is locked, as we
+ * just created it (so there can be no old holders
+ * that haven't tested I_LOCK).
+ */
+ inode->i_state &= ~(I_LOCK|I_NEW);
+ wake_up(&inode->i_wait);
+}
+
+
/*
* This is called without the inode lock held.. Be careful.
*
* We no longer cache the sb_flags in i_flags - see fs.h
* -- rmk@arm.uk.linux.org
*/
-static struct inode * get_new_inode(struct super_block *sb, unsigned long ino, struct list_head *head, find_inode_t find_actor, void *opaque)
+static struct inode * get_new_inode(struct super_block *sb, struct list_head *head, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data)
{
struct inode * inode;
@@ -848,37 +887,68 @@
spin_lock(&inode_lock);
/* We released the lock, so.. */
- old = find_inode(sb, ino, head, find_actor, opaque);
+ old = find_inode(sb, head, test, data);
if (!old) {
+ if (set(inode, data))
+ goto set_failed;
+
inodes_stat.nr_inodes++;
list_add(&inode->i_list, &inode_in_use);
list_add(&inode->i_hash, head);
- inode->i_ino = ino;
- inode->i_state = I_LOCK;
+ inode->i_state = I_LOCK|I_NEW;
spin_unlock(&inode_lock);
- /* reiserfs specific hack right here. We don't
- ** want this to last, and are looking for VFS changes
- ** that will allow us to get rid of it.
- ** -- mason@suse.com
- */
- if (sb->s_op->read_inode2) {
- sb->s_op->read_inode2(inode, opaque) ;
- } else {
- sb->s_op->read_inode(inode);
- }
-
- /*
- * This is special! We do not need the spinlock
- * when clearing I_LOCK, because we're guaranteed
- * that nobody else tries to do anything about the
- * state of the inode when it is locked, as we
- * just created it (so there can be no old holders
- * that haven't tested I_LOCK).
+ /* Return the locked inode with I_NEW set, the
+ * caller is responsible for filling in the contents
*/
- inode->i_state &= ~I_LOCK;
- wake_up(&inode->i_wait);
+ return inode;
+ }
+
+ /*
+ * Uhhuh, somebody else created the same inode under
+ * us. Use the old inode instead of the one we just
+ * allocated.
+ */
+ __iget(old);
+ spin_unlock(&inode_lock);
+ destroy_inode(inode);
+ inode = old;
+ wait_on_inode(inode);
+ }
+ return inode;
+set_failed:
+ spin_unlock(&inode_lock);
+ destroy_inode(inode);
+ return NULL;
+}
+
+/*
+ * get_new_inode_fast is the fast path version of get_new_inode, see the
+ * comment at iget_locked for details.
+ */
+static struct inode * get_new_inode_fast(struct super_block *sb, struct list_head *head, unsigned long ino)
+{
+ struct inode * inode;
+
+ inode = alloc_inode(sb);
+ if (inode) {
+ struct inode * old;
+
+ spin_lock(&inode_lock);
+ /* We released the lock, so.. */
+ old = find_inode_fast(sb, head, ino);
+ if (!old) {
+ inode->i_ino = ino;
+ inodes_stat.nr_inodes++;
+ list_add(&inode->i_list, &inode_in_use);
+ list_add(&inode->i_hash, head);
+ inode->i_state = I_LOCK|I_NEW;
+ spin_unlock(&inode_lock);
+
+ /* Return the locked inode with I_NEW set, the
+ * caller is responsible for filling in the contents
+ */
return inode;
}
@@ -896,9 +966,9 @@
return inode;
}
-static inline unsigned long hash(struct super_block *sb, unsigned long i_ino)
+static inline unsigned long hash(struct super_block *sb, unsigned long hashval)
{
- unsigned long tmp = i_ino + ((unsigned long) sb / L1_CACHE_BYTES);
+ unsigned long tmp = hashval + ((unsigned long) sb / L1_CACHE_BYTES);
tmp = tmp + (tmp >> I_HASHBITS);
return tmp & I_HASHMASK;
}
@@ -930,7 +1000,8 @@
retry:
if (counter > max_reserved) {
head = inode_hashtable + hash(sb,counter);
- inode = find_inode(sb, res = counter++, head, NULL, NULL);
+ res = counter++;
+ inode = find_inode_fast(sb, head, res);
if (!inode) {
spin_unlock(&inode_lock);
return res;
@@ -958,14 +1029,18 @@
return inode;
}
-
-struct inode *iget4(struct super_block *sb, unsigned long ino, find_inode_t find_actor, void *opaque)
+/*
+ * This is iget without the read_inode portion of get_new_inode
+ * the filesystem gets back a new locked and hashed inode and gets
+ * to fill it in before unlocking it via unlock_new_inode().
+ */
+struct inode *iget5_locked(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data)
{
- struct list_head * head = inode_hashtable + hash(sb,ino);
+ struct list_head * head = inode_hashtable + hash(sb, hashval);
struct inode * inode;
spin_lock(&inode_lock);
- inode = find_inode(sb, ino, head, find_actor, opaque);
+ inode = find_inode(sb, head, test, data);
if (inode) {
__iget(inode);
spin_unlock(&inode_lock);
@@ -978,22 +1053,57 @@
* get_new_inode() will do the right thing, re-trying the search
* in case it had to block at any point.
*/
- return get_new_inode(sb, ino, head, find_actor, opaque);
+ return get_new_inode(sb, head, test, set, data);
}
+/*
+ * Because most filesystems are based on 32-bit unique inode numbers some
+ * functions are duplicated to keep iget_locked as a fast path. We can avoid
+ * unnecessary pointer dereferences and function calls for this specific
+ * case. The duplicated functions (find_inode_fast and get_new_inode_fast)
+ * have the same pre- and post-conditions as their original counterparts.
+ */
+struct inode *iget_locked(struct super_block *sb, unsigned long ino)
+{
+ struct list_head * head = inode_hashtable + hash(sb, ino);
+ struct inode * inode;
+
+ spin_lock(&inode_lock);
+ inode = find_inode_fast(sb, head, ino);
+ if (inode) {
+ __iget(inode);
+ spin_unlock(&inode_lock);
+ wait_on_inode(inode);
+ return inode;
+ }
+ spin_unlock(&inode_lock);
+
+ /*
+ * get_new_inode_fast() will do the right thing, re-trying the search
+ * in case it had to block at any point.
+ */
+ return get_new_inode_fast(sb, head, ino);
+}
+
+EXPORT_SYMBOL(iget5_locked);
+EXPORT_SYMBOL(iget_locked);
+EXPORT_SYMBOL(unlock_new_inode);
+
/**
- * insert_inode_hash - hash an inode
+ * __insert_inode_hash - hash an inode
* @inode: unhashed inode
+ * @hashval: unsigned long value used to locate this object in the
+ * inode_hashtable.
*
* Add an inode to the inode hash for this superblock. If the inode
* has no superblock it is added to a separate anonymous chain.
*/
-void insert_inode_hash(struct inode *inode)
+void __insert_inode_hash(struct inode *inode, unsigned long hashval)
{
struct list_head *head = &anon_hash_chain;
if (inode->i_sb)
- head = inode_hashtable + hash(inode->i_sb, inode->i_ino);
+ head = inode_hashtable + hash(inode->i_sb, hashval);
spin_lock(&inode_lock);
list_add(&inode->i_hash, head);
spin_unlock(&inode_lock);
===== fs/coda/cnode.c 1.8 vs edited =====
--- 1.8/fs/coda/cnode.c Wed May 29 19:20:33 2002
+++ edited/fs/coda/cnode.c Fri Feb 21 18:35:03 2003
@@ -27,11 +27,6 @@
return 1;
}
-static int coda_inocmp(struct inode *inode, unsigned long ino, void *opaque)
-{
- return (coda_fideq((ViceFid *)opaque, &(ITOC(inode)->c_fid)));
-}
-
static struct inode_operations coda_symlink_inode_operations = {
readlink: page_readlink,
follow_link: page_follow_link,
@@ -62,29 +57,46 @@
init_special_inode(inode, inode->i_mode, attr->va_rdev);
}
+static int coda_test_inode(struct inode *inode, void *data)
+{
+ ViceFid *fid = (ViceFid *)data;
+ return coda_fideq(&(ITOC(inode)->c_fid), fid);
+}
+
+static int coda_set_inode(struct inode *inode, void *data)
+{
+ ViceFid *fid = (ViceFid *)data;
+ ITOC(inode)->c_fid = *fid;
+ return 0;
+}
+
+static int coda_fail_inode(struct inode *inode, void *data)
+{
+ return -1;
+}
+
struct inode * coda_iget(struct super_block * sb, ViceFid * fid,
struct coda_vattr * attr)
{
struct inode *inode;
struct coda_inode_info *cii;
- ino_t ino = coda_f2i(fid);
struct coda_sb_info *sbi = coda_sbp(sb);
+ unsigned long hash = coda_f2i(fid);
- down(&sbi->sbi_iget4_mutex);
- inode = iget4(sb, ino, coda_inocmp, fid);
+ inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
if ( !inode ) {
- CDEBUG(D_CNODE, "coda_iget: no inode\n");
- up(&sbi->sbi_iget4_mutex);
return ERR_PTR(-ENOMEM);
}
- /* check if the inode is already initialized */
- cii = ITOC(inode);
- if (coda_isnullfid(&cii->c_fid))
- /* new, empty inode found... initializing */
- cii->c_fid = *fid;
- up(&sbi->sbi_iget4_mutex);
+ if (inode->i_state & I_NEW) {
+ cii = ITOC(inode);
+ /* we still need to set i_ino for things like stat(2) */
+ inode->i_ino = hash;
+ list_add(&cii->c_cilist, &sbi->sbi_cihead);
+ unlock_new_inode(inode);
+ }
+
/* always replace the attributes, type might have changed */
coda_fill_inode(inode, attr);
@@ -129,6 +141,7 @@
struct ViceFid *newfid)
{
struct coda_inode_info *cii;
+ unsigned long hash = coda_f2i(newfid);
cii = ITOC(inode);
@@ -139,17 +152,16 @@
/* XXX we probably need to hold some lock here! */
remove_inode_hash(inode);
cii->c_fid = *newfid;
- inode->i_ino = coda_f2i(newfid);
- insert_inode_hash(inode);
+ inode->i_ino = hash;
+ __insert_inode_hash(inode, hash);
}
/* convert a fid to an inode. */
struct inode *coda_fid_to_inode(ViceFid *fid, struct super_block *sb)
{
- ino_t nr;
+
struct inode *inode;
- struct coda_inode_info *cii;
- struct coda_sb_info *sbi;
+ unsigned long hash = coda_f2i(fid);
if ( !sb ) {
printk("coda_fid_to_inode: no sb!\n");
@@ -158,47 +170,29 @@
CDEBUG(D_INODE, "%s\n", coda_f2s(fid));
- sbi = coda_sbp(sb);
- nr = coda_f2i(fid);
- down(&sbi->sbi_iget4_mutex);
- inode = iget4(sb, nr, coda_inocmp, fid);
- if ( !inode ) {
- printk("coda_fid_to_inode: null from iget, sb %p, nr %ld.\n",
- sb, (long)nr);
- goto out_unlock;
- }
-
- cii = ITOC(inode);
+ inode = iget5_locked(sb, hash, coda_test_inode, coda_fail_inode, fid);
+ if ( !inode )
+ return NULL;
- /* The inode could already be purged due to memory pressure */
- if (coda_isnullfid(&cii->c_fid)) {
- inode->i_nlink = 0;
- iput(inode);
- goto out_unlock;
- }
+ /* we should never see newly created inodes because we intentionally
+ * fail in the initialization callback */
+ BUG_ON(inode->i_state & I_NEW);
CDEBUG(D_INODE, "found %ld\n", inode->i_ino);
- up(&sbi->sbi_iget4_mutex);
return inode;
-
-out_unlock:
- up(&sbi->sbi_iget4_mutex);
- return NULL;
}
/* the CONTROL inode is made without asking attributes from Venus */
int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
{
- int error = 0;
+ int error = -ENOMEM;
*inode = iget(sb, CTL_INO);
- if ( *inode ) {
+ if (*inode) {
(*inode)->i_op = &coda_ioctl_inode_operations;
(*inode)->i_fop = &coda_ioctl_operations;
(*inode)->i_mode = 0444;
error = 0;
- } else {
- error = -ENOMEM;
}
return error;
===== fs/coda/inode.c 1.9 vs edited =====
--- 1.9/fs/coda/inode.c Wed May 29 19:17:41 2002
+++ edited/fs/coda/inode.c Fri Feb 21 18:35:58 2003
@@ -34,7 +34,6 @@
/* VFS super_block ops */
static struct super_block *coda_read_super(struct super_block *, void *, int);
-static void coda_read_inode(struct inode *);
static void coda_clear_inode(struct inode *);
static void coda_put_super(struct super_block *);
static int coda_statfs(struct super_block *sb, struct statfs *buf);
@@ -42,7 +41,6 @@
/* exported operations */
struct super_operations coda_super_operations =
{
- read_inode: coda_read_inode,
clear_inode: coda_clear_inode,
put_super: coda_put_super,
statfs: coda_statfs,
@@ -179,24 +177,6 @@
printk("Coda: Bye bye.\n");
kfree(sbi);
-}
-
-/* all filling in of inodes postponed until lookup */
-static void coda_read_inode(struct inode *inode)
-{
- struct coda_sb_info *sbi = coda_sbp(inode->i_sb);
- struct coda_inode_info *cii;
-
- if (!sbi) BUG();
-
- cii = ITOC(inode);
- if (!coda_isnullfid(&cii->c_fid)) {
- printk("coda_read_inode: initialized inode");
- return;
- }
-
- cii->c_mapcount = 0;
- list_add(&cii->c_cilist, &sbi->sbi_cihead);
}
static void coda_clear_inode(struct inode *inode)
===== fs/nfs/inode.c 1.18 vs edited =====
--- 1.18/fs/nfs/inode.c Thu Aug 15 05:05:32 2002
+++ edited/fs/nfs/inode.c Mon Feb 24 12:38:30 2003
@@ -45,7 +45,6 @@
void nfs_zap_caches(struct inode *);
static void nfs_invalidate_inode(struct inode *);
-static void nfs_read_inode(struct inode *);
static void nfs_write_inode(struct inode *,int);
static void nfs_delete_inode(struct inode *);
static void nfs_put_super(struct super_block *);
@@ -55,7 +54,6 @@
static int nfs_show_options(struct seq_file *, struct vfsmount *);
static struct super_operations nfs_sops = {
- read_inode: nfs_read_inode,
write_inode: nfs_write_inode,
delete_inode: nfs_delete_inode,
put_super: nfs_put_super,
@@ -92,30 +90,6 @@
return nfs_fileid_to_ino_t(fattr->fileid);
}
-/*
- * The "read_inode" function doesn't actually do anything:
- * the real data is filled in later in nfs_fhget. Here we
- * just mark the cache times invalid, and zero out i_mode
- * (the latter makes "nfs_refresh_inode" do the right thing
- * wrt pipe inodes)
- */
-static void
-nfs_read_inode(struct inode * inode)
-{
- inode->i_blksize = inode->i_sb->s_blocksize;
- inode->i_mode = 0;
- inode->i_rdev = 0;
- /* We can't support UPDATE_ATIME(), since the server will reset it */
- inode->i_flags |= S_NOATIME;
- INIT_LIST_HEAD(&inode->u.nfs_i.read);
- INIT_LIST_HEAD(&inode->u.nfs_i.dirty);
- INIT_LIST_HEAD(&inode->u.nfs_i.commit);
- INIT_LIST_HEAD(&inode->u.nfs_i.writeback);
- NFS_CACHEINV(inode);
- NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
- NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
-}
-
static void
nfs_write_inode(struct inode *inode, int sync)
{
@@ -634,7 +608,6 @@
* do this once. (We don't allow inodes to change types.)
*/
if (inode->i_mode == 0) {
- NFS_FILEID(inode) = fattr->fileid;
inode->i_mode = fattr->mode;
/* Why so? Because we want revalidate for devices/FIFOs, and
* that's precisely what we have in nfs_file_inode_operations.
@@ -650,9 +623,7 @@
inode->i_op = &nfs_symlink_inode_operations;
else
init_special_inode(inode, inode->i_mode, fattr->rdev);
- memcpy(&inode->u.nfs_i.fh, fh, sizeof(inode->u.nfs_i.fh));
}
- nfs_refresh_inode(inode, fattr);
}
struct nfs_find_desc {
@@ -667,7 +638,7 @@
* i_ino.
*/
static int
-nfs_find_actor(struct inode *inode, unsigned long ino, void *opaque)
+nfs_find_actor(struct inode *inode, void *opaque)
{
struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
struct nfs_fh *fh = desc->fh;
@@ -685,6 +656,18 @@
return 1;
}
+static int
+nfs_init_locked(struct inode *inode, void *opaque)
+{
+ struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
+ struct nfs_fh *fh = desc->fh;
+ struct nfs_fattr *fattr = desc->fattr;
+
+ NFS_FILEID(inode) = fattr->fileid;
+ memcpy(NFS_FH(inode), fh, sizeof(struct nfs_fh));
+ return 0;
+}
+
/*
* This is our own version of iget that looks up inodes by file handle
* instead of inode number. We use this technique instead of using
@@ -712,7 +695,7 @@
{
struct nfs_find_desc desc = { fh, fattr };
struct inode *inode = NULL;
- unsigned long ino;
+ unsigned long hash;
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
goto out_no_inode;
@@ -722,12 +705,29 @@
goto out_no_inode;
}
- ino = nfs_fattr_to_ino_t(fattr);
+ hash = nfs_fattr_to_ino_t(fattr);
- if (!(inode = iget4(sb, ino, nfs_find_actor, &desc)))
+ if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
goto out_no_inode;
- nfs_fill_inode(inode, fh, fattr);
+ if (inode->i_state & I_NEW) {
+ inode->i_ino = hash;
+ inode->i_blksize = inode->i_sb->s_blocksize;
+ inode->i_mode = 0;
+ inode->i_rdev = 0;
+ /* We can't support UPDATE_ATIME(), since the server will reset it */
+ inode->i_flags |= S_NOATIME;
+ INIT_LIST_HEAD(&inode->u.nfs_i.read);
+ INIT_LIST_HEAD(&inode->u.nfs_i.dirty);
+ INIT_LIST_HEAD(&inode->u.nfs_i.commit);
+ INIT_LIST_HEAD(&inode->u.nfs_i.writeback);
+ NFS_CACHEINV(inode);
+ NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
+ NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
+ nfs_fill_inode(inode, fh, fattr);
+ unlock_new_inode(inode);
+ } else
+ nfs_refresh_inode(inode, fattr);
dprintk("NFS: __nfs_fhget(%x/%Ld ct=%d)\n",
inode->i_dev, (long long)NFS_FILEID(inode),
atomic_read(&inode->i_count));
===== fs/reiserfs/inode.c 1.42 vs edited =====
--- 1.42/fs/reiserfs/inode.c Thu Feb 13 15:42:42 2003
+++ edited/fs/reiserfs/inode.c Fri Feb 21 14:29:42 2003
@@ -30,7 +30,7 @@
lock_kernel() ;
/* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
- if (INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
+ if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
down (&inode->i_sem);
journal_begin(&th, inode->i_sb, jbegin_count) ;
@@ -887,7 +887,7 @@
// item version directly
//
-// called by read_inode
+// called by read_locked_inode
static void init_inode (struct inode * inode, struct path * path)
{
struct buffer_head * bh;
@@ -1127,27 +1127,24 @@
make_bad_inode(inode);
}
-void reiserfs_read_inode(struct inode *inode) {
- reiserfs_make_bad_inode(inode) ;
+int reiserfs_init_locked_inode (struct inode * inode, void *p)
+{
+ struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p ;
+ inode->i_ino = args->objectid;
+ INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
+ return 0;
}
-
/* looks for stat data in the tree, and fills up the fields of in-core
inode stat data fields */
-void reiserfs_read_inode2 (struct inode * inode, void *p)
+void reiserfs_read_locked_inode (struct inode * inode, struct reiserfs_iget_args *args)
{
INITIALIZE_PATH (path_to_sd);
struct cpu_key key;
- struct reiserfs_iget4_args *args = (struct reiserfs_iget4_args *)p ;
unsigned long dirino;
int retval;
- if (!p) {
- reiserfs_make_bad_inode(inode) ;
- return;
- }
-
- dirino = args->objectid ;
+ dirino = args->dirid ;
/* set version 1, version 2 could be used too, because stat data
key is the same in both versions */
@@ -1160,7 +1157,7 @@
/* look for the object's stat data */
retval = search_item (inode->i_sb, &key, &path_to_sd);
if (retval == IO_ERROR) {
- reiserfs_warning ("vs-13070: reiserfs_read_inode2: "
+ reiserfs_warning ("vs-13070: reiserfs_read_locked_inode: "
"i/o failure occurred trying to find stat data of %K\n",
&key);
reiserfs_make_bad_inode(inode) ;
@@ -1192,7 +1189,7 @@
during mount (fs/reiserfs/super.c:finish_unfinished()). */
if( ( inode -> i_nlink == 0 ) &&
! inode -> i_sb -> u.reiserfs_sb.s_is_unlinked_ok ) {
- reiserfs_warning( "vs-13075: reiserfs_read_inode2: "
+ reiserfs_warning( "vs-13075: reiserfs_read_locked_inode: "
"dead inode read from disk %K. "
"This is likely to be race with knfsd. Ignore\n",
&key );
@@ -1204,38 +1201,43 @@
}
/**
- * reiserfs_find_actor() - "find actor" reiserfs supplies to iget4().
+ * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
*
* @inode: inode from hash table to check
- * @inode_no: inode number we are looking for
- * @opaque: "cookie" passed to iget4(). This is &reiserfs_iget4_args.
+ * @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
*
- * This function is called by iget4() to distinguish reiserfs inodes
+ * This function is called by iget5_locked() to distinguish reiserfs inodes
* having the same inode numbers. Such inodes can only exist due to some
* error condition. One of them should be bad. Inodes with identical
* inode numbers (objectids) are distinguished by parent directory ids.
*
*/
-static int reiserfs_find_actor( struct inode *inode,
- unsigned long inode_no, void *opaque )
+int reiserfs_find_actor( struct inode *inode, void *opaque )
{
- struct reiserfs_iget4_args *args;
+ struct reiserfs_iget_args *args;
args = opaque;
/* args is already in CPU order */
- return le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args -> objectid;
+ return (inode->i_ino == args->objectid) &&
+ (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
}
struct inode * reiserfs_iget (struct super_block * s, const struct cpu_key * key)
{
struct inode * inode;
- struct reiserfs_iget4_args args ;
+ struct reiserfs_iget_args args ;
- args.objectid = key->on_disk_key.k_dir_id ;
- inode = iget4 (s, key->on_disk_key.k_objectid,
- reiserfs_find_actor, (void *)(&args));
+ args.objectid = key->on_disk_key.k_objectid ;
+ args.dirid = key->on_disk_key.k_dir_id ;
+ inode = iget5_locked (s, key->on_disk_key.k_objectid,
+ reiserfs_find_actor, reiserfs_init_locked_inode, (void *)(&args));
if (!inode)
return ERR_PTR(-ENOMEM) ;
+
+ if (inode->i_state & I_NEW) {
+ reiserfs_read_locked_inode(inode, &args);
+ unlock_new_inode(inode);
+ }
if (comp_short_keys (INODE_PKEY (inode), key) || is_bad_inode (inode)) {
/* either due to i/o error or a stale NFS handle */
===== fs/reiserfs/super.c 1.27 vs edited =====
--- 1.27/fs/reiserfs/super.c Wed Oct 30 19:42:36 2002
+++ edited/fs/reiserfs/super.c Fri Feb 21 14:28:06 2003
@@ -381,8 +381,6 @@
struct super_operations reiserfs_sops =
{
- read_inode: reiserfs_read_inode,
- read_inode2: reiserfs_read_inode2,
write_inode: reiserfs_write_inode,
dirty_inode: reiserfs_dirty_inode,
delete_inode: reiserfs_delete_inode,
@@ -1117,7 +1115,7 @@
int old_format = 0;
unsigned long blocks;
int jinit_done = 0 ;
- struct reiserfs_iget4_args args ;
+ struct reiserfs_iget_args args ;
int old_magic;
struct reiserfs_super_block * rs;
@@ -1194,11 +1192,17 @@
printk("clm-7000: Detected readonly device, marking FS readonly\n") ;
s->s_flags |= MS_RDONLY ;
}
- args.objectid = REISERFS_ROOT_PARENT_OBJECTID ;
- root_inode = iget4 (s, REISERFS_ROOT_OBJECTID, 0, (void *)(&args));
+ args.objectid = REISERFS_ROOT_OBJECTID ;
+ args.dirid = REISERFS_ROOT_PARENT_OBJECTID ;
+ root_inode = iget5_locked (s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor, reiserfs_init_locked_inode, (void *)(&args));
if (!root_inode) {
printk ("reiserfs_read_super: get root inode failed\n");
goto error;
+ }
+
+ if (root_inode->i_state & I_NEW) {
+ reiserfs_read_locked_inode(root_inode, &args);
+ unlock_new_inode(root_inode);
}
s->s_root = d_alloc_root(root_inode);
===== include/linux/fs.h 1.74 vs edited =====
--- 1.74/include/linux/fs.h Sat Jan 4 06:09:16 2003
+++ edited/include/linux/fs.h Fri Feb 21 15:18:40 2003
@@ -885,13 +885,6 @@
void (*read_inode) (struct inode *);
- /* reiserfs kludge. reiserfs needs 64 bits of information to
- ** find an inode. We are using the read_inode2 call to get
- ** that information. We don't like this, and are waiting on some
- ** VFS changes for the real solution.
- ** iget4 calls read_inode2, iff it is defined
- */
- void (*read_inode2) (struct inode *, void *) ;
void (*dirty_inode) (struct inode *);
void (*write_inode) (struct inode *, int);
void (*put_inode) (struct inode *);
@@ -940,6 +933,7 @@
#define I_LOCK 8
#define I_FREEING 16
#define I_CLEAR 32
+#define I_NEW 64
#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
@@ -1378,19 +1372,32 @@
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
-typedef int (*find_inode_t)(struct inode *, unsigned long, void *);
-extern struct inode * iget4(struct super_block *, unsigned long, find_inode_t, void *);
+extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
+extern struct inode * iget_locked(struct super_block *, unsigned long);
+extern void unlock_new_inode(struct inode *);
+
static inline struct inode *iget(struct super_block *sb, unsigned long ino)
{
- return iget4(sb, ino, NULL, NULL);
+ struct inode *inode = iget_locked(sb, ino);
+
+ if (inode && (inode->i_state & I_NEW)) {
+ sb->s_op->read_inode(inode);
+ unlock_new_inode(inode);
+ }
+
+ return inode;
}
extern void clear_inode(struct inode *);
extern struct inode *new_inode(struct super_block *sb);
extern void remove_suid(struct inode *inode);
-extern void insert_inode_hash(struct inode *);
+extern void __insert_inode_hash(struct inode *, unsigned long hashval);
extern void remove_inode_hash(struct inode *);
+static inline void insert_inode_hash(struct inode *inode) {
+ __insert_inode_hash(inode, inode->i_ino);
+}
+
extern struct file * get_empty_filp(void);
extern void file_move(struct file *f, struct list_head *list);
extern struct buffer_head * get_hash_table(kdev_t, int, int);
===== include/linux/reiserfs_fs.h 1.26 vs edited =====
--- 1.26/include/linux/reiserfs_fs.h Mon Jan 20 13:19:30 2003
+++ edited/include/linux/reiserfs_fs.h Fri Feb 21 15:20:00 2003
@@ -1478,8 +1478,9 @@
#define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)))
#define PUT_B_I_POS_UNFM_POINTER(bh,ih,pos, val) do {*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)) = cpu_to_le32(val); } while (0)
-struct reiserfs_iget4_args {
+struct reiserfs_iget_args {
__u32 objectid ;
+ __u32 dirid ;
} ;
/***************************************************************************/
@@ -1730,8 +1731,9 @@
/* inode.c */
-void reiserfs_read_inode (struct inode * inode) ;
-void reiserfs_read_inode2(struct inode * inode, void *p) ;
+void reiserfs_read_locked_inode(struct inode * inode, struct reiserfs_iget_args *args) ;
+int reiserfs_find_actor(struct inode * inode, void *p) ;
+int reiserfs_init_locked_inode(struct inode * inode, void *p) ;
void reiserfs_delete_inode (struct inode * inode);
void reiserfs_write_inode (struct inode * inode, int) ;
struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, __u32 *data,
===== kernel/ksyms.c 1.67 vs edited =====
--- 1.67/kernel/ksyms.c Tue Oct 1 22:34:41 2002
+++ edited/kernel/ksyms.c Fri Feb 21 14:19:50 2003
@@ -140,7 +140,6 @@
EXPORT_SYMBOL(fget);
EXPORT_SYMBOL(igrab);
EXPORT_SYMBOL(iunique);
-EXPORT_SYMBOL(iget4);
EXPORT_SYMBOL(iput);
EXPORT_SYMBOL(inode_init_once);
EXPORT_SYMBOL(force_delete);
@@ -528,7 +527,7 @@
EXPORT_SYMBOL(read_ahead);
EXPORT_SYMBOL(get_hash_table);
EXPORT_SYMBOL(new_inode);
-EXPORT_SYMBOL(insert_inode_hash);
+EXPORT_SYMBOL(__insert_inode_hash);
EXPORT_SYMBOL(remove_inode_hash);
EXPORT_SYMBOL(buffer_insert_list);
EXPORT_SYMBOL(make_bad_inode);
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time)
2003-02-24 10:21 ` 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time) Oleg Drokin
@ 2003-02-24 16:50 ` Trond Myklebust
2003-02-24 17:02 ` Trond Myklebust
2003-02-24 17:03 ` Oleg Drokin
0 siblings, 2 replies; 22+ messages in thread
From: Trond Myklebust @ 2003-02-24 16:50 UTC (permalink / raw)
To: Oleg Drokin; +Cc: Andrew Morton, vs, nikita, jaharkes, linux-kernel
>>>>> " " == Oleg Drokin <green@namesys.com> writes:
> Original patch was from Jan Harkes <jaharkes@cs.cmu.edu>,
> and was applied somewhere at the beginning of 2.5
> development. It still would be nice if someone more
> knowledgeable in NFS client code will review the changes
> (and the same is true for Coda of course).
Please remind me. Why can't NFS set inode->i_mode, call
nfs_fill_inode() etc. in the 'init_locked' callback?
As for the issue of the stat() problem you mentioned: does your server
have a monotonically increasing inode->i_ctime? If ntp or something
like that keeps turning the clock backward on the server, then the NFS
client has no chance of recognizing which attribute updates are the
more recent ones.
Cheers,
Trond
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time)
2003-02-24 16:50 ` Trond Myklebust
@ 2003-02-24 17:02 ` Trond Myklebust
2003-02-24 17:03 ` Oleg Drokin
1 sibling, 0 replies; 22+ messages in thread
From: Trond Myklebust @ 2003-02-24 17:02 UTC (permalink / raw)
To: Oleg Drokin; +Cc: Andrew Morton, vs, nikita, jaharkes, linux-kernel
>>>>> " " == Trond Myklebust <trond.myklebust@fys.uio.no> writes:
>>>>> " " == Oleg Drokin <green@namesys.com> writes:
> Please remind me. Why can't NFS set inode->i_mode, call
> nfs_fill_inode() etc. in the 'init_locked' callback?
Duh, forget that question. The latter is called with the global inode
lock held which you want to release asap.
Cheers,
Trond
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time)
2003-02-24 16:50 ` Trond Myklebust
2003-02-24 17:02 ` Trond Myklebust
@ 2003-02-24 17:03 ` Oleg Drokin
2003-02-24 17:17 ` Trond Myklebust
1 sibling, 1 reply; 22+ messages in thread
From: Oleg Drokin @ 2003-02-24 17:03 UTC (permalink / raw)
To: Trond Myklebust; +Cc: Andrew Morton, vs, nikita, jaharkes, linux-kernel
Hello!
On Mon, Feb 24, 2003 at 05:50:15PM +0100, Trond Myklebust wrote:
> > Original patch was from Jan Harkes <jaharkes@cs.cmu.edu>,
> > and was applied somewhere at the beginning of 2.5
> > development. It still would be nice if someone more
> > knowledgeable in NFS client code will review the changes
> > (and the same is true for Coda of course).
> Please remind me. Why can't NFS set inode->i_mode, call
> nfs_fill_inode() etc. in the 'init_locked' callback?
Well, it seems there is no reason against that.
> As for the issue of the stat() problem you mentioned: does your server
> have a monotonically increasing inode->i_ctime? If ntp or something
I think it have.
> like that keeps turning the clock backward on the server, then the NFS
> client has no chance of recognizing which attribute updates are the
> more recent ones.
Ok, I stopped ntpd. Will see what will happen. ;)
Aha, it died already:
doread: read: Input/output error
How about that "RPC request reserved 1144 but used 4024" alike stuff"?
Bye,
Oleg
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time)
2003-02-24 17:03 ` Oleg Drokin
@ 2003-02-24 17:17 ` Trond Myklebust
2003-02-24 17:26 ` Oleg Drokin
0 siblings, 1 reply; 22+ messages in thread
From: Trond Myklebust @ 2003-02-24 17:17 UTC (permalink / raw)
To: Oleg Drokin; +Cc: Andrew Morton, vs, nikita, jaharkes, linux-kernel
>>>>> " " == Oleg Drokin <green@namesys.com> writes:
>> like that keeps turning the clock backward on the server, then
>> the NFS client has no chance of recognizing which attribute
>> updates are the more recent ones.
> Ok, I stopped ntpd. Will see what will happen. ;) Aha, it died
> already: doread: read: Input/output error
Silly question: Are you perhaps testing using the 'soft' mount option?
> How about that "RPC request reserved 1144 but used 4024" alike
> stuff"?
Sounds like Neil made another accounting error in the server code
8-). Can you try to check on which type of request it occurs (readdir,
read, readlink?).
Cheers,
Trond
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time)
2003-02-24 17:17 ` Trond Myklebust
@ 2003-02-24 17:26 ` Oleg Drokin
2003-02-24 17:33 ` Trond Myklebust
0 siblings, 1 reply; 22+ messages in thread
From: Oleg Drokin @ 2003-02-24 17:26 UTC (permalink / raw)
To: Trond Myklebust; +Cc: Andrew Morton, vs, nikita, jaharkes, linux-kernel
Hello!
On Mon, Feb 24, 2003 at 06:17:30PM +0100, Trond Myklebust wrote:
> >> like that keeps turning the clock backward on the server, then
> >> the NFS client has no chance of recognizing which attribute
> >> updates are the more recent ones.
> > Ok, I stopped ntpd. Will see what will happen. ;) Aha, it died
> > already: doread: read: Input/output error
> Silly question: Are you perhaps testing using the 'soft' mount option?
Hm. I just mount it as
mount server:/tmp /mnt -t nfs
no extra options. So I guess no, I do not have wthis soft stuff.
> > How about that "RPC request reserved 1144 but used 4024" alike
> > stuff"?
> Sounds like Neil made another accounting error in the server code
> 8-). Can you try to check on which type of request it occurs (readdir,
> read, readlink?).
Ok. Will try (I guess I need to do this on latest 2.4 kernel anyway.
(my nfs server is running 2.4.20)).
Bye,
Oleg
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time)
2003-02-24 17:26 ` Oleg Drokin
@ 2003-02-24 17:33 ` Trond Myklebust
2003-02-24 17:38 ` Oleg Drokin
0 siblings, 1 reply; 22+ messages in thread
From: Trond Myklebust @ 2003-02-24 17:33 UTC (permalink / raw)
To: Oleg Drokin; +Cc: Andrew Morton, vs, nikita, jaharkes, linux-kernel
>>>>> " " == Oleg Drokin <green@namesys.com> writes:
> Hello! On Mon, Feb 24, 2003 at 06:17:30PM +0100, Trond
> Myklebust wrote:
>> >> like that keeps turning the clock backward on the server,
>> >> then the NFS client has no chance of recognizing which
>> >> attribute updates are the more recent ones.
>> > Ok, I stopped ntpd. Will see what will happen. ;) Aha, it
>> > died already: doread: read: Input/output error
>> Silly question: Are you perhaps testing using the 'soft' mount
>> option?
> Hm. I just mount it as mount server:/tmp /mnt -t nfs no extra
> options. So I guess no, I do not have wthis soft stuff.
...and there were no accompanying messages logged by syslog? In
principle the NFS client is always supposed to supply an error message
when it generates an EIO.
Cheers,
Trond
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time)
2003-02-24 17:33 ` Trond Myklebust
@ 2003-02-24 17:38 ` Oleg Drokin
0 siblings, 0 replies; 22+ messages in thread
From: Oleg Drokin @ 2003-02-24 17:38 UTC (permalink / raw)
To: Trond Myklebust; +Cc: Andrew Morton, vs, nikita, jaharkes, linux-kernel
Hello!
On Mon, Feb 24, 2003 at 06:33:33PM +0100, Trond Myklebust wrote:
> > Hello! On Mon, Feb 24, 2003 at 06:17:30PM +0100, Trond
> > Myklebust wrote:
> >> >> like that keeps turning the clock backward on the server,
> >> >> then the NFS client has no chance of recognizing which
> >> >> attribute updates are the more recent ones.
> >> > Ok, I stopped ntpd. Will see what will happen. ;) Aha, it
> >> > died already: doread: read: Input/output error
> >> Silly question: Are you perhaps testing using the 'soft' mount
> >> option?
> > Hm. I just mount it as mount server:/tmp /mnt -t nfs no extra
> > options. So I guess no, I do not have wthis soft stuff.
> ...and there were no accompanying messages logged by syslog? In
None at all at both sides. (btw, I am running NFSv3)
Bye,
Oleg
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: 2.4 iget5_locked port attempt to 2.4
2003-02-21 20:04 ` Jan Harkes
2003-02-22 9:29 ` Oleg Drokin
2003-02-24 10:21 ` 2.4 iget5_locked port attempt to 2.4 (supposedly fixed NFS version this time) Oleg Drokin
@ 2003-03-03 14:09 ` Oleg Drokin
2003-03-03 16:25 ` Alan Cox
2 siblings, 1 reply; 22+ messages in thread
From: Oleg Drokin @ 2003-03-03 14:09 UTC (permalink / raw)
To: Andrew Morton, mason, trond.myklebust, jaharkes, linux-kernel
Hello!
It's me again, I basically got no reply for this iget5_locked patch
I have now. Would there be any objections if I try push it to Marcelo
tomorrow? ;)
Patch is below for your reference. Thank you.
Bye,
Oleg
===== Documentation/filesystems/Locking 1.7 vs edited =====
--- 1.7/Documentation/filesystems/Locking Thu Dec 19 05:34:24 2002
+++ edited/Documentation/filesystems/Locking Fri Feb 21 14:19:38 2003
@@ -114,7 +114,7 @@
remount_fs: yes yes maybe (see below)
umount_begin: yes no maybe (see below)
-->read_inode() is not a method - it's a callback used in iget()/iget4().
+->read_inode() is not a method - it's a callback used in iget().
rules for mount_sem are not too nice - it is going to die and be replaced
by better scheme anyway.
===== fs/Makefile 1.16 vs edited =====
--- 1.16/fs/Makefile Thu Sep 12 04:00:00 2002
+++ edited/fs/Makefile Fri Feb 21 14:24:21 2003
@@ -7,7 +7,7 @@
O_TARGET := fs.o
-export-objs := filesystems.o open.o dcache.o buffer.o
+export-objs := filesystems.o open.o dcache.o buffer.o inode.o
mod-subdirs := nls
obj-y := open.o read_write.o devices.o file_table.o buffer.o \
===== fs/inode.c 1.36 vs edited =====
--- 1.36/fs/inode.c Thu Aug 29 07:02:23 2002
+++ edited/fs/inode.c Fri Feb 21 14:20:46 2003
@@ -17,6 +17,7 @@
#include <linux/swapctl.h>
#include <linux/prefetch.h>
#include <linux/locks.h>
+#include <linux/module.h>
/*
* New inode.c implementation.
@@ -783,7 +784,32 @@
* by hand after calling find_inode now! This simplifies iunique and won't
* add any additional branch in the common code.
*/
-static struct inode * find_inode(struct super_block * sb, unsigned long ino, struct list_head *head, find_inode_t find_actor, void *opaque)
+static struct inode * find_inode(struct super_block * sb, struct list_head *head, int (*test)(struct inode *, void *), void *data)
+{
+ struct list_head *tmp;
+ struct inode * inode;
+
+ tmp = head;
+ for (;;) {
+ tmp = tmp->next;
+ inode = NULL;
+ if (tmp == head)
+ break;
+ inode = list_entry(tmp, struct inode, i_hash);
+ if (inode->i_sb != sb)
+ continue;
+ if (!test(inode, data))
+ continue;
+ break;
+ }
+ return inode;
+}
+
+/*
+ * find_inode_fast is the fast path version of find_inode, see the comment at
+ * iget_locked for details.
+ */
+static struct inode * find_inode_fast(struct super_block * sb, struct list_head *head, unsigned long ino)
{
struct list_head *tmp;
struct inode * inode;
@@ -799,8 +825,6 @@
continue;
if (inode->i_sb != sb)
continue;
- if (find_actor && !find_actor(inode, ino, opaque))
- continue;
break;
}
return inode;
@@ -832,13 +856,28 @@
return inode;
}
+void unlock_new_inode(struct inode *inode)
+{
+ /*
+ * This is special! We do not need the spinlock
+ * when clearing I_LOCK, because we're guaranteed
+ * that nobody else tries to do anything about the
+ * state of the inode when it is locked, as we
+ * just created it (so there can be no old holders
+ * that haven't tested I_LOCK).
+ */
+ inode->i_state &= ~(I_LOCK|I_NEW);
+ wake_up(&inode->i_wait);
+}
+
+
/*
* This is called without the inode lock held.. Be careful.
*
* We no longer cache the sb_flags in i_flags - see fs.h
* -- rmk@arm.uk.linux.org
*/
-static struct inode * get_new_inode(struct super_block *sb, unsigned long ino, struct list_head *head, find_inode_t find_actor, void *opaque)
+static struct inode * get_new_inode(struct super_block *sb, struct list_head *head, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data)
{
struct inode * inode;
@@ -848,37 +887,68 @@
spin_lock(&inode_lock);
/* We released the lock, so.. */
- old = find_inode(sb, ino, head, find_actor, opaque);
+ old = find_inode(sb, head, test, data);
if (!old) {
+ if (set(inode, data))
+ goto set_failed;
+
inodes_stat.nr_inodes++;
list_add(&inode->i_list, &inode_in_use);
list_add(&inode->i_hash, head);
- inode->i_ino = ino;
- inode->i_state = I_LOCK;
+ inode->i_state = I_LOCK|I_NEW;
spin_unlock(&inode_lock);
- /* reiserfs specific hack right here. We don't
- ** want this to last, and are looking for VFS changes
- ** that will allow us to get rid of it.
- ** -- mason@suse.com
- */
- if (sb->s_op->read_inode2) {
- sb->s_op->read_inode2(inode, opaque) ;
- } else {
- sb->s_op->read_inode(inode);
- }
-
- /*
- * This is special! We do not need the spinlock
- * when clearing I_LOCK, because we're guaranteed
- * that nobody else tries to do anything about the
- * state of the inode when it is locked, as we
- * just created it (so there can be no old holders
- * that haven't tested I_LOCK).
+ /* Return the locked inode with I_NEW set, the
+ * caller is responsible for filling in the contents
*/
- inode->i_state &= ~I_LOCK;
- wake_up(&inode->i_wait);
+ return inode;
+ }
+
+ /*
+ * Uhhuh, somebody else created the same inode under
+ * us. Use the old inode instead of the one we just
+ * allocated.
+ */
+ __iget(old);
+ spin_unlock(&inode_lock);
+ destroy_inode(inode);
+ inode = old;
+ wait_on_inode(inode);
+ }
+ return inode;
+set_failed:
+ spin_unlock(&inode_lock);
+ destroy_inode(inode);
+ return NULL;
+}
+
+/*
+ * get_new_inode_fast is the fast path version of get_new_inode, see the
+ * comment at iget_locked for details.
+ */
+static struct inode * get_new_inode_fast(struct super_block *sb, struct list_head *head, unsigned long ino)
+{
+ struct inode * inode;
+
+ inode = alloc_inode(sb);
+ if (inode) {
+ struct inode * old;
+
+ spin_lock(&inode_lock);
+ /* We released the lock, so.. */
+ old = find_inode_fast(sb, head, ino);
+ if (!old) {
+ inode->i_ino = ino;
+ inodes_stat.nr_inodes++;
+ list_add(&inode->i_list, &inode_in_use);
+ list_add(&inode->i_hash, head);
+ inode->i_state = I_LOCK|I_NEW;
+ spin_unlock(&inode_lock);
+
+ /* Return the locked inode with I_NEW set, the
+ * caller is responsible for filling in the contents
+ */
return inode;
}
@@ -896,9 +966,9 @@
return inode;
}
-static inline unsigned long hash(struct super_block *sb, unsigned long i_ino)
+static inline unsigned long hash(struct super_block *sb, unsigned long hashval)
{
- unsigned long tmp = i_ino + ((unsigned long) sb / L1_CACHE_BYTES);
+ unsigned long tmp = hashval + ((unsigned long) sb / L1_CACHE_BYTES);
tmp = tmp + (tmp >> I_HASHBITS);
return tmp & I_HASHMASK;
}
@@ -930,7 +1000,8 @@
retry:
if (counter > max_reserved) {
head = inode_hashtable + hash(sb,counter);
- inode = find_inode(sb, res = counter++, head, NULL, NULL);
+ res = counter++;
+ inode = find_inode_fast(sb, head, res);
if (!inode) {
spin_unlock(&inode_lock);
return res;
@@ -958,14 +1029,18 @@
return inode;
}
-
-struct inode *iget4(struct super_block *sb, unsigned long ino, find_inode_t find_actor, void *opaque)
+/*
+ * This is iget without the read_inode portion of get_new_inode
+ * the filesystem gets back a new locked and hashed inode and gets
+ * to fill it in before unlocking it via unlock_new_inode().
+ */
+struct inode *iget5_locked(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data)
{
- struct list_head * head = inode_hashtable + hash(sb,ino);
+ struct list_head * head = inode_hashtable + hash(sb, hashval);
struct inode * inode;
spin_lock(&inode_lock);
- inode = find_inode(sb, ino, head, find_actor, opaque);
+ inode = find_inode(sb, head, test, data);
if (inode) {
__iget(inode);
spin_unlock(&inode_lock);
@@ -978,22 +1053,57 @@
* get_new_inode() will do the right thing, re-trying the search
* in case it had to block at any point.
*/
- return get_new_inode(sb, ino, head, find_actor, opaque);
+ return get_new_inode(sb, head, test, set, data);
}
+/*
+ * Because most filesystems are based on 32-bit unique inode numbers some
+ * functions are duplicated to keep iget_locked as a fast path. We can avoid
+ * unnecessary pointer dereferences and function calls for this specific
+ * case. The duplicated functions (find_inode_fast and get_new_inode_fast)
+ * have the same pre- and post-conditions as their original counterparts.
+ */
+struct inode *iget_locked(struct super_block *sb, unsigned long ino)
+{
+ struct list_head * head = inode_hashtable + hash(sb, ino);
+ struct inode * inode;
+
+ spin_lock(&inode_lock);
+ inode = find_inode_fast(sb, head, ino);
+ if (inode) {
+ __iget(inode);
+ spin_unlock(&inode_lock);
+ wait_on_inode(inode);
+ return inode;
+ }
+ spin_unlock(&inode_lock);
+
+ /*
+ * get_new_inode_fast() will do the right thing, re-trying the search
+ * in case it had to block at any point.
+ */
+ return get_new_inode_fast(sb, head, ino);
+}
+
+EXPORT_SYMBOL(iget5_locked);
+EXPORT_SYMBOL(iget_locked);
+EXPORT_SYMBOL(unlock_new_inode);
+
/**
- * insert_inode_hash - hash an inode
+ * __insert_inode_hash - hash an inode
* @inode: unhashed inode
+ * @hashval: unsigned long value used to locate this object in the
+ * inode_hashtable.
*
* Add an inode to the inode hash for this superblock. If the inode
* has no superblock it is added to a separate anonymous chain.
*/
-void insert_inode_hash(struct inode *inode)
+void __insert_inode_hash(struct inode *inode, unsigned long hashval)
{
struct list_head *head = &anon_hash_chain;
if (inode->i_sb)
- head = inode_hashtable + hash(inode->i_sb, inode->i_ino);
+ head = inode_hashtable + hash(inode->i_sb, hashval);
spin_lock(&inode_lock);
list_add(&inode->i_hash, head);
spin_unlock(&inode_lock);
===== fs/coda/cnode.c 1.8 vs edited =====
--- 1.8/fs/coda/cnode.c Wed May 29 19:20:33 2002
+++ edited/fs/coda/cnode.c Mon Feb 24 13:20:12 2003
@@ -27,11 +27,6 @@
return 1;
}
-static int coda_inocmp(struct inode *inode, unsigned long ino, void *opaque)
-{
- return (coda_fideq((ViceFid *)opaque, &(ITOC(inode)->c_fid)));
-}
-
static struct inode_operations coda_symlink_inode_operations = {
readlink: page_readlink,
follow_link: page_follow_link,
@@ -62,29 +57,46 @@
init_special_inode(inode, inode->i_mode, attr->va_rdev);
}
+static int coda_test_inode(struct inode *inode, void *data)
+{
+ ViceFid *fid = (ViceFid *)data;
+ return coda_fideq(&(ITOC(inode)->c_fid), fid);
+}
+
+static int coda_set_inode(struct inode *inode, void *data)
+{
+ ViceFid *fid = (ViceFid *)data;
+ ITOC(inode)->c_fid = *fid;
+ return 0;
+}
+
+static int coda_fail_inode(struct inode *inode, void *data)
+{
+ return -1;
+}
+
struct inode * coda_iget(struct super_block * sb, ViceFid * fid,
struct coda_vattr * attr)
{
struct inode *inode;
struct coda_inode_info *cii;
- ino_t ino = coda_f2i(fid);
struct coda_sb_info *sbi = coda_sbp(sb);
+ unsigned long hash = coda_f2i(fid);
- down(&sbi->sbi_iget4_mutex);
- inode = iget4(sb, ino, coda_inocmp, fid);
+ inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
if ( !inode ) {
- CDEBUG(D_CNODE, "coda_iget: no inode\n");
- up(&sbi->sbi_iget4_mutex);
return ERR_PTR(-ENOMEM);
}
- /* check if the inode is already initialized */
- cii = ITOC(inode);
- if (coda_isnullfid(&cii->c_fid))
- /* new, empty inode found... initializing */
- cii->c_fid = *fid;
- up(&sbi->sbi_iget4_mutex);
+ if (inode->i_state & I_NEW) {
+ cii = ITOC(inode);
+ /* we still need to set i_ino for things like stat(2) */
+ inode->i_ino = hash;
+ list_add(&cii->c_cilist, &sbi->sbi_cihead);
+ unlock_new_inode(inode);
+ }
+
/* always replace the attributes, type might have changed */
coda_fill_inode(inode, attr);
@@ -129,6 +141,7 @@
struct ViceFid *newfid)
{
struct coda_inode_info *cii;
+ unsigned long hash = coda_f2i(newfid);
cii = ITOC(inode);
@@ -139,17 +152,16 @@
/* XXX we probably need to hold some lock here! */
remove_inode_hash(inode);
cii->c_fid = *newfid;
- inode->i_ino = coda_f2i(newfid);
- insert_inode_hash(inode);
+ inode->i_ino = hash;
+ __insert_inode_hash(inode, hash);
}
/* convert a fid to an inode. */
struct inode *coda_fid_to_inode(ViceFid *fid, struct super_block *sb)
{
- ino_t nr;
+
struct inode *inode;
- struct coda_inode_info *cii;
- struct coda_sb_info *sbi;
+ unsigned long hash = coda_f2i(fid);
if ( !sb ) {
printk("coda_fid_to_inode: no sb!\n");
@@ -158,47 +170,29 @@
CDEBUG(D_INODE, "%s\n", coda_f2s(fid));
- sbi = coda_sbp(sb);
- nr = coda_f2i(fid);
- down(&sbi->sbi_iget4_mutex);
- inode = iget4(sb, nr, coda_inocmp, fid);
- if ( !inode ) {
- printk("coda_fid_to_inode: null from iget, sb %p, nr %ld.\n",
- sb, (long)nr);
- goto out_unlock;
- }
-
- cii = ITOC(inode);
+ inode = iget5_locked(sb, hash, coda_test_inode, coda_fail_inode, fid);
+ if ( !inode )
+ return NULL;
- /* The inode could already be purged due to memory pressure */
- if (coda_isnullfid(&cii->c_fid)) {
- inode->i_nlink = 0;
- iput(inode);
- goto out_unlock;
- }
+ /* we should never see newly created inodes because we intentionally
+ * fail in the initialization callback */
+ BUG_ON(inode->i_state & I_NEW);
CDEBUG(D_INODE, "found %ld\n", inode->i_ino);
- up(&sbi->sbi_iget4_mutex);
return inode;
-
-out_unlock:
- up(&sbi->sbi_iget4_mutex);
- return NULL;
}
/* the CONTROL inode is made without asking attributes from Venus */
int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
{
- int error = 0;
+ int error = -ENOMEM;
*inode = iget(sb, CTL_INO);
- if ( *inode ) {
+ if (*inode) {
(*inode)->i_op = &coda_ioctl_inode_operations;
(*inode)->i_fop = &coda_ioctl_operations;
(*inode)->i_mode = 0444;
error = 0;
- } else {
- error = -ENOMEM;
}
return error;
===== fs/coda/inode.c 1.9 vs edited =====
--- 1.9/fs/coda/inode.c Wed May 29 19:17:41 2002
+++ edited/fs/coda/inode.c Mon Feb 24 13:20:12 2003
@@ -34,7 +34,6 @@
/* VFS super_block ops */
static struct super_block *coda_read_super(struct super_block *, void *, int);
-static void coda_read_inode(struct inode *);
static void coda_clear_inode(struct inode *);
static void coda_put_super(struct super_block *);
static int coda_statfs(struct super_block *sb, struct statfs *buf);
@@ -42,7 +41,6 @@
/* exported operations */
struct super_operations coda_super_operations =
{
- read_inode: coda_read_inode,
clear_inode: coda_clear_inode,
put_super: coda_put_super,
statfs: coda_statfs,
@@ -179,24 +177,6 @@
printk("Coda: Bye bye.\n");
kfree(sbi);
-}
-
-/* all filling in of inodes postponed until lookup */
-static void coda_read_inode(struct inode *inode)
-{
- struct coda_sb_info *sbi = coda_sbp(inode->i_sb);
- struct coda_inode_info *cii;
-
- if (!sbi) BUG();
-
- cii = ITOC(inode);
- if (!coda_isnullfid(&cii->c_fid)) {
- printk("coda_read_inode: initialized inode");
- return;
- }
-
- cii->c_mapcount = 0;
- list_add(&cii->c_cilist, &sbi->sbi_cihead);
}
static void coda_clear_inode(struct inode *inode)
===== fs/nfs/inode.c 1.18 vs edited =====
--- 1.18/fs/nfs/inode.c Thu Aug 15 05:05:32 2002
+++ edited/fs/nfs/inode.c Mon Feb 24 12:38:30 2003
@@ -45,7 +45,6 @@
void nfs_zap_caches(struct inode *);
static void nfs_invalidate_inode(struct inode *);
-static void nfs_read_inode(struct inode *);
static void nfs_write_inode(struct inode *,int);
static void nfs_delete_inode(struct inode *);
static void nfs_put_super(struct super_block *);
@@ -55,7 +54,6 @@
static int nfs_show_options(struct seq_file *, struct vfsmount *);
static struct super_operations nfs_sops = {
- read_inode: nfs_read_inode,
write_inode: nfs_write_inode,
delete_inode: nfs_delete_inode,
put_super: nfs_put_super,
@@ -92,30 +90,6 @@
return nfs_fileid_to_ino_t(fattr->fileid);
}
-/*
- * The "read_inode" function doesn't actually do anything:
- * the real data is filled in later in nfs_fhget. Here we
- * just mark the cache times invalid, and zero out i_mode
- * (the latter makes "nfs_refresh_inode" do the right thing
- * wrt pipe inodes)
- */
-static void
-nfs_read_inode(struct inode * inode)
-{
- inode->i_blksize = inode->i_sb->s_blocksize;
- inode->i_mode = 0;
- inode->i_rdev = 0;
- /* We can't support UPDATE_ATIME(), since the server will reset it */
- inode->i_flags |= S_NOATIME;
- INIT_LIST_HEAD(&inode->u.nfs_i.read);
- INIT_LIST_HEAD(&inode->u.nfs_i.dirty);
- INIT_LIST_HEAD(&inode->u.nfs_i.commit);
- INIT_LIST_HEAD(&inode->u.nfs_i.writeback);
- NFS_CACHEINV(inode);
- NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
- NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
-}
-
static void
nfs_write_inode(struct inode *inode, int sync)
{
@@ -634,7 +608,6 @@
* do this once. (We don't allow inodes to change types.)
*/
if (inode->i_mode == 0) {
- NFS_FILEID(inode) = fattr->fileid;
inode->i_mode = fattr->mode;
/* Why so? Because we want revalidate for devices/FIFOs, and
* that's precisely what we have in nfs_file_inode_operations.
@@ -650,9 +623,7 @@
inode->i_op = &nfs_symlink_inode_operations;
else
init_special_inode(inode, inode->i_mode, fattr->rdev);
- memcpy(&inode->u.nfs_i.fh, fh, sizeof(inode->u.nfs_i.fh));
}
- nfs_refresh_inode(inode, fattr);
}
struct nfs_find_desc {
@@ -667,7 +638,7 @@
* i_ino.
*/
static int
-nfs_find_actor(struct inode *inode, unsigned long ino, void *opaque)
+nfs_find_actor(struct inode *inode, void *opaque)
{
struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
struct nfs_fh *fh = desc->fh;
@@ -685,6 +656,18 @@
return 1;
}
+static int
+nfs_init_locked(struct inode *inode, void *opaque)
+{
+ struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
+ struct nfs_fh *fh = desc->fh;
+ struct nfs_fattr *fattr = desc->fattr;
+
+ NFS_FILEID(inode) = fattr->fileid;
+ memcpy(NFS_FH(inode), fh, sizeof(struct nfs_fh));
+ return 0;
+}
+
/*
* This is our own version of iget that looks up inodes by file handle
* instead of inode number. We use this technique instead of using
@@ -712,7 +695,7 @@
{
struct nfs_find_desc desc = { fh, fattr };
struct inode *inode = NULL;
- unsigned long ino;
+ unsigned long hash;
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
goto out_no_inode;
@@ -722,12 +705,29 @@
goto out_no_inode;
}
- ino = nfs_fattr_to_ino_t(fattr);
+ hash = nfs_fattr_to_ino_t(fattr);
- if (!(inode = iget4(sb, ino, nfs_find_actor, &desc)))
+ if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
goto out_no_inode;
- nfs_fill_inode(inode, fh, fattr);
+ if (inode->i_state & I_NEW) {
+ inode->i_ino = hash;
+ inode->i_blksize = inode->i_sb->s_blocksize;
+ inode->i_mode = 0;
+ inode->i_rdev = 0;
+ /* We can't support UPDATE_ATIME(), since the server will reset it */
+ inode->i_flags |= S_NOATIME;
+ INIT_LIST_HEAD(&inode->u.nfs_i.read);
+ INIT_LIST_HEAD(&inode->u.nfs_i.dirty);
+ INIT_LIST_HEAD(&inode->u.nfs_i.commit);
+ INIT_LIST_HEAD(&inode->u.nfs_i.writeback);
+ NFS_CACHEINV(inode);
+ NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
+ NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
+ nfs_fill_inode(inode, fh, fattr);
+ unlock_new_inode(inode);
+ } else
+ nfs_refresh_inode(inode, fattr);
dprintk("NFS: __nfs_fhget(%x/%Ld ct=%d)\n",
inode->i_dev, (long long)NFS_FILEID(inode),
atomic_read(&inode->i_count));
===== fs/reiserfs/inode.c 1.42 vs edited =====
--- 1.42/fs/reiserfs/inode.c Thu Feb 13 15:42:42 2003
+++ edited/fs/reiserfs/inode.c Fri Feb 21 14:29:42 2003
@@ -30,7 +30,7 @@
lock_kernel() ;
/* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
- if (INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
+ if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
down (&inode->i_sem);
journal_begin(&th, inode->i_sb, jbegin_count) ;
@@ -887,7 +887,7 @@
// item version directly
//
-// called by read_inode
+// called by read_locked_inode
static void init_inode (struct inode * inode, struct path * path)
{
struct buffer_head * bh;
@@ -1127,27 +1127,24 @@
make_bad_inode(inode);
}
-void reiserfs_read_inode(struct inode *inode) {
- reiserfs_make_bad_inode(inode) ;
+int reiserfs_init_locked_inode (struct inode * inode, void *p)
+{
+ struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p ;
+ inode->i_ino = args->objectid;
+ INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
+ return 0;
}
-
/* looks for stat data in the tree, and fills up the fields of in-core
inode stat data fields */
-void reiserfs_read_inode2 (struct inode * inode, void *p)
+void reiserfs_read_locked_inode (struct inode * inode, struct reiserfs_iget_args *args)
{
INITIALIZE_PATH (path_to_sd);
struct cpu_key key;
- struct reiserfs_iget4_args *args = (struct reiserfs_iget4_args *)p ;
unsigned long dirino;
int retval;
- if (!p) {
- reiserfs_make_bad_inode(inode) ;
- return;
- }
-
- dirino = args->objectid ;
+ dirino = args->dirid ;
/* set version 1, version 2 could be used too, because stat data
key is the same in both versions */
@@ -1160,7 +1157,7 @@
/* look for the object's stat data */
retval = search_item (inode->i_sb, &key, &path_to_sd);
if (retval == IO_ERROR) {
- reiserfs_warning ("vs-13070: reiserfs_read_inode2: "
+ reiserfs_warning ("vs-13070: reiserfs_read_locked_inode: "
"i/o failure occurred trying to find stat data of %K\n",
&key);
reiserfs_make_bad_inode(inode) ;
@@ -1192,7 +1189,7 @@
during mount (fs/reiserfs/super.c:finish_unfinished()). */
if( ( inode -> i_nlink == 0 ) &&
! inode -> i_sb -> u.reiserfs_sb.s_is_unlinked_ok ) {
- reiserfs_warning( "vs-13075: reiserfs_read_inode2: "
+ reiserfs_warning( "vs-13075: reiserfs_read_locked_inode: "
"dead inode read from disk %K. "
"This is likely to be race with knfsd. Ignore\n",
&key );
@@ -1204,38 +1201,43 @@
}
/**
- * reiserfs_find_actor() - "find actor" reiserfs supplies to iget4().
+ * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
*
* @inode: inode from hash table to check
- * @inode_no: inode number we are looking for
- * @opaque: "cookie" passed to iget4(). This is &reiserfs_iget4_args.
+ * @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
*
- * This function is called by iget4() to distinguish reiserfs inodes
+ * This function is called by iget5_locked() to distinguish reiserfs inodes
* having the same inode numbers. Such inodes can only exist due to some
* error condition. One of them should be bad. Inodes with identical
* inode numbers (objectids) are distinguished by parent directory ids.
*
*/
-static int reiserfs_find_actor( struct inode *inode,
- unsigned long inode_no, void *opaque )
+int reiserfs_find_actor( struct inode *inode, void *opaque )
{
- struct reiserfs_iget4_args *args;
+ struct reiserfs_iget_args *args;
args = opaque;
/* args is already in CPU order */
- return le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args -> objectid;
+ return (inode->i_ino == args->objectid) &&
+ (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
}
struct inode * reiserfs_iget (struct super_block * s, const struct cpu_key * key)
{
struct inode * inode;
- struct reiserfs_iget4_args args ;
+ struct reiserfs_iget_args args ;
- args.objectid = key->on_disk_key.k_dir_id ;
- inode = iget4 (s, key->on_disk_key.k_objectid,
- reiserfs_find_actor, (void *)(&args));
+ args.objectid = key->on_disk_key.k_objectid ;
+ args.dirid = key->on_disk_key.k_dir_id ;
+ inode = iget5_locked (s, key->on_disk_key.k_objectid,
+ reiserfs_find_actor, reiserfs_init_locked_inode, (void *)(&args));
if (!inode)
return ERR_PTR(-ENOMEM) ;
+
+ if (inode->i_state & I_NEW) {
+ reiserfs_read_locked_inode(inode, &args);
+ unlock_new_inode(inode);
+ }
if (comp_short_keys (INODE_PKEY (inode), key) || is_bad_inode (inode)) {
/* either due to i/o error or a stale NFS handle */
===== fs/reiserfs/super.c 1.27 vs edited =====
--- 1.27/fs/reiserfs/super.c Wed Oct 30 19:42:36 2002
+++ edited/fs/reiserfs/super.c Fri Feb 21 14:28:06 2003
@@ -381,8 +381,6 @@
struct super_operations reiserfs_sops =
{
- read_inode: reiserfs_read_inode,
- read_inode2: reiserfs_read_inode2,
write_inode: reiserfs_write_inode,
dirty_inode: reiserfs_dirty_inode,
delete_inode: reiserfs_delete_inode,
@@ -1117,7 +1115,7 @@
int old_format = 0;
unsigned long blocks;
int jinit_done = 0 ;
- struct reiserfs_iget4_args args ;
+ struct reiserfs_iget_args args ;
int old_magic;
struct reiserfs_super_block * rs;
@@ -1194,11 +1192,17 @@
printk("clm-7000: Detected readonly device, marking FS readonly\n") ;
s->s_flags |= MS_RDONLY ;
}
- args.objectid = REISERFS_ROOT_PARENT_OBJECTID ;
- root_inode = iget4 (s, REISERFS_ROOT_OBJECTID, 0, (void *)(&args));
+ args.objectid = REISERFS_ROOT_OBJECTID ;
+ args.dirid = REISERFS_ROOT_PARENT_OBJECTID ;
+ root_inode = iget5_locked (s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor, reiserfs_init_locked_inode, (void *)(&args));
if (!root_inode) {
printk ("reiserfs_read_super: get root inode failed\n");
goto error;
+ }
+
+ if (root_inode->i_state & I_NEW) {
+ reiserfs_read_locked_inode(root_inode, &args);
+ unlock_new_inode(root_inode);
}
s->s_root = d_alloc_root(root_inode);
===== include/linux/fs.h 1.74 vs edited =====
--- 1.74/include/linux/fs.h Sat Jan 4 06:09:16 2003
+++ edited/include/linux/fs.h Fri Feb 21 15:18:40 2003
@@ -885,13 +885,6 @@
void (*read_inode) (struct inode *);
- /* reiserfs kludge. reiserfs needs 64 bits of information to
- ** find an inode. We are using the read_inode2 call to get
- ** that information. We don't like this, and are waiting on some
- ** VFS changes for the real solution.
- ** iget4 calls read_inode2, iff it is defined
- */
- void (*read_inode2) (struct inode *, void *) ;
void (*dirty_inode) (struct inode *);
void (*write_inode) (struct inode *, int);
void (*put_inode) (struct inode *);
@@ -940,6 +933,7 @@
#define I_LOCK 8
#define I_FREEING 16
#define I_CLEAR 32
+#define I_NEW 64
#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
@@ -1378,19 +1372,32 @@
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
-typedef int (*find_inode_t)(struct inode *, unsigned long, void *);
-extern struct inode * iget4(struct super_block *, unsigned long, find_inode_t, void *);
+extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
+extern struct inode * iget_locked(struct super_block *, unsigned long);
+extern void unlock_new_inode(struct inode *);
+
static inline struct inode *iget(struct super_block *sb, unsigned long ino)
{
- return iget4(sb, ino, NULL, NULL);
+ struct inode *inode = iget_locked(sb, ino);
+
+ if (inode && (inode->i_state & I_NEW)) {
+ sb->s_op->read_inode(inode);
+ unlock_new_inode(inode);
+ }
+
+ return inode;
}
extern void clear_inode(struct inode *);
extern struct inode *new_inode(struct super_block *sb);
extern void remove_suid(struct inode *inode);
-extern void insert_inode_hash(struct inode *);
+extern void __insert_inode_hash(struct inode *, unsigned long hashval);
extern void remove_inode_hash(struct inode *);
+static inline void insert_inode_hash(struct inode *inode) {
+ __insert_inode_hash(inode, inode->i_ino);
+}
+
extern struct file * get_empty_filp(void);
extern void file_move(struct file *f, struct list_head *list);
extern struct buffer_head * get_hash_table(kdev_t, int, int);
===== include/linux/reiserfs_fs.h 1.26 vs edited =====
--- 1.26/include/linux/reiserfs_fs.h Mon Jan 20 13:19:30 2003
+++ edited/include/linux/reiserfs_fs.h Fri Feb 21 15:20:00 2003
@@ -1478,8 +1478,9 @@
#define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)))
#define PUT_B_I_POS_UNFM_POINTER(bh,ih,pos, val) do {*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)) = cpu_to_le32(val); } while (0)
-struct reiserfs_iget4_args {
+struct reiserfs_iget_args {
__u32 objectid ;
+ __u32 dirid ;
} ;
/***************************************************************************/
@@ -1730,8 +1731,9 @@
/* inode.c */
-void reiserfs_read_inode (struct inode * inode) ;
-void reiserfs_read_inode2(struct inode * inode, void *p) ;
+void reiserfs_read_locked_inode(struct inode * inode, struct reiserfs_iget_args *args) ;
+int reiserfs_find_actor(struct inode * inode, void *p) ;
+int reiserfs_init_locked_inode(struct inode * inode, void *p) ;
void reiserfs_delete_inode (struct inode * inode);
void reiserfs_write_inode (struct inode * inode, int) ;
struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, __u32 *data,
===== kernel/ksyms.c 1.67 vs edited =====
--- 1.67/kernel/ksyms.c Tue Oct 1 22:34:41 2002
+++ edited/kernel/ksyms.c Fri Feb 21 14:19:50 2003
@@ -140,7 +140,6 @@
EXPORT_SYMBOL(fget);
EXPORT_SYMBOL(igrab);
EXPORT_SYMBOL(iunique);
-EXPORT_SYMBOL(iget4);
EXPORT_SYMBOL(iput);
EXPORT_SYMBOL(inode_init_once);
EXPORT_SYMBOL(force_delete);
@@ -528,7 +527,7 @@
EXPORT_SYMBOL(read_ahead);
EXPORT_SYMBOL(get_hash_table);
EXPORT_SYMBOL(new_inode);
-EXPORT_SYMBOL(insert_inode_hash);
+EXPORT_SYMBOL(__insert_inode_hash);
EXPORT_SYMBOL(remove_inode_hash);
EXPORT_SYMBOL(buffer_insert_list);
EXPORT_SYMBOL(make_bad_inode);
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4
2003-03-03 14:09 ` 2.4 iget5_locked port attempt to 2.4 Oleg Drokin
@ 2003-03-03 16:25 ` Alan Cox
2003-03-03 15:35 ` Nikita Danilov
2003-03-03 15:38 ` Oleg Drokin
0 siblings, 2 replies; 22+ messages in thread
From: Alan Cox @ 2003-03-03 16:25 UTC (permalink / raw)
To: Oleg Drokin
Cc: Andrew Morton, mason, trond.myklebust, jaharkes,
Linux Kernel Mailing List
On Mon, 2003-03-03 at 14:09, Oleg Drokin wrote:
> Hello!
>
> It's me again, I basically got no reply for this iget5_locked patch
> I have now. Would there be any objections if I try push it to Marcelo
> tomorrow? ;)
I just binned it. Certainly its not the kind of stuff I want to test in -ac,
too many VFS changes outside reiserfs
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: 2.4 iget5_locked port attempt to 2.4
2003-03-03 16:25 ` Alan Cox
@ 2003-03-03 15:35 ` Nikita Danilov
2003-03-03 15:38 ` Oleg Drokin
1 sibling, 0 replies; 22+ messages in thread
From: Nikita Danilov @ 2003-03-03 15:35 UTC (permalink / raw)
To: Alan Cox
Cc: Oleg Drokin, Andrew Morton, mason, trond.myklebust, jaharkes,
Linux Kernel Mailing List
Alan Cox writes:
> On Mon, 2003-03-03 at 14:09, Oleg Drokin wrote:
> > Hello!
> >
> > It's me again, I basically got no reply for this iget5_locked patch
> > I have now. Would there be any objections if I try push it to Marcelo
> > tomorrow? ;)
>
> I just binned it. Certainly its not the kind of stuff I want to test in -ac,
> too many VFS changes outside reiserfs
In 2.4 there is a race when find_actor is used in conjunction with
->read_inode2, because inode_lock is released before calling
->read_inode2 and hence, find_actor cannot safely rely on
initialisations of inode's private part done in ->read_inode2. This is
why in 2.5 iget5_locked takes special "set" callback that is called from
under inode_lock. It so happened that reiserfs is the only (is it?) file
system that used both find_actor and ->read_inode2, but whole API is
just broken and should be fixed.
>
Nikita.
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: 2.4 iget5_locked port attempt to 2.4
2003-03-03 16:25 ` Alan Cox
2003-03-03 15:35 ` Nikita Danilov
@ 2003-03-03 15:38 ` Oleg Drokin
2003-03-03 15:57 ` Anton Altaparmakov
2003-03-03 16:50 ` Jan Harkes
1 sibling, 2 replies; 22+ messages in thread
From: Oleg Drokin @ 2003-03-03 15:38 UTC (permalink / raw)
To: Alan Cox
Cc: Andrew Morton, mason, trond.myklebust, jaharkes,
Linux Kernel Mailing List
Hello!
On Mon, Mar 03, 2003 at 04:25:41PM +0000, Alan Cox wrote:
> > It's me again, I basically got no reply for this iget5_locked patch
> > I have now. Would there be any objections if I try push it to Marcelo
> > tomorrow? ;)
> I just binned it. Certainly its not the kind of stuff I want to test in -ac,
> too many VFS changes outside reiserfs
Andrew Morton said "iget5_locked() looks simple enough, and as far as I can
tell does not change any existing code - it just adds new stuff.",
also this code (in its 2.5 incarnation) was tested in 2.5 for long time already.
Also it fixes real bug (and while I have another reiserfs-only fix for the bug,
it is fairly inelegant).
Bye,
Oleg
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4
2003-03-03 15:38 ` Oleg Drokin
@ 2003-03-03 15:57 ` Anton Altaparmakov
2003-03-03 16:04 ` Oleg Drokin
2003-03-03 16:50 ` Jan Harkes
1 sibling, 1 reply; 22+ messages in thread
From: Anton Altaparmakov @ 2003-03-03 15:57 UTC (permalink / raw)
To: Oleg Drokin
Cc: Alan Cox, Andrew Morton, mason, trond.myklebust, jaharkes,
Linux Kernel Mailing List
On Mon, 3 Mar 2003, Oleg Drokin wrote:
> On Mon, Mar 03, 2003 at 04:25:41PM +0000, Alan Cox wrote:
> > > It's me again, I basically got no reply for this iget5_locked patch
> > > I have now. Would there be any objections if I try push it to Marcelo
> > > tomorrow? ;)
> > I just binned it. Certainly its not the kind of stuff I want to test in -ac,
> > too many VFS changes outside reiserfs
>
> Andrew Morton said "iget5_locked() looks simple enough, and as far as I can
> tell does not change any existing code - it just adds new stuff.",
> also this code (in its 2.5 incarnation) was tested in 2.5 for long time already.
> Also it fixes real bug (and while I have another reiserfs-only fix for the bug,
> it is fairly inelegant).
I agree it should go into 2.4 but I don't think the patches you are
submitting should go in. From what I can see they are an older version
compared to what actually went into 2.5. (I am basing this on the comments
to the functions rather than thorough code comparisons but I don't have
time to look at it more in depth atm.) Why don't you use the actual 2.5
code and make new patches or at least make use of the patches that finally
went into 2.5?
Best regards,
Anton
--
Anton Altaparmakov <aia21 at cantab.net> (replace at with @)
Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net
WWW: http://linux-ntfs.sf.net/ & http://www-stu.christs.cam.ac.uk/~aia21/
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: 2.4 iget5_locked port attempt to 2.4
2003-03-03 15:57 ` Anton Altaparmakov
@ 2003-03-03 16:04 ` Oleg Drokin
2003-03-03 16:27 ` Anton Altaparmakov
0 siblings, 1 reply; 22+ messages in thread
From: Oleg Drokin @ 2003-03-03 16:04 UTC (permalink / raw)
To: Anton Altaparmakov
Cc: Alan Cox, Andrew Morton, mason, trond.myklebust, jaharkes,
Linux Kernel Mailing List
Hello!
On Mon, Mar 03, 2003 at 03:57:19PM +0000, Anton Altaparmakov wrote:
> > > > It's me again, I basically got no reply for this iget5_locked patch
> > > > I have now. Would there be any objections if I try push it to Marcelo
> > > > tomorrow? ;)
> > > I just binned it. Certainly its not the kind of stuff I want to test in -ac,
> > > too many VFS changes outside reiserfs
> > Andrew Morton said "iget5_locked() looks simple enough, and as far as I can
> > tell does not change any existing code - it just adds new stuff.",
> > also this code (in its 2.5 incarnation) was tested in 2.5 for long time already.
> > Also it fixes real bug (and while I have another reiserfs-only fix for the bug,
> > it is fairly inelegant).
> I agree it should go into 2.4 but I don't think the patches you are
> submitting should go in. From what I can see they are an older version
> compared to what actually went into 2.5. (I am basing this on the comments
What I am submitting is just changesets 1.373.172.1..1.373.172.6 from
2.5 bk tree. So these patches are what went into 2.5 (plus all the bugs I
have made during adapting these to 2.4, of course).
> to the functions rather than thorough code comparisons but I don't have
> time to look at it more in depth atm.) Why don't you use the actual 2.5
> code and make new patches or at least make use of the patches that finally
> went into 2.5?
Looking at the changelog, it seems much later on there were ifind_fast() and ifind()
additions to this code, but I was not sure I should take these too.
I can though, if people think that would be useful.
Bye,
Oleg
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4
2003-03-03 16:04 ` Oleg Drokin
@ 2003-03-03 16:27 ` Anton Altaparmakov
2003-03-03 16:45 ` Oleg Drokin
0 siblings, 1 reply; 22+ messages in thread
From: Anton Altaparmakov @ 2003-03-03 16:27 UTC (permalink / raw)
To: Oleg Drokin
Cc: Alan Cox, Andrew Morton, mason, trond.myklebust, jaharkes,
Linux Kernel Mailing List
On Mon, 3 Mar 2003, Oleg Drokin wrote:
> On Mon, Mar 03, 2003 at 03:57:19PM +0000, Anton Altaparmakov wrote:
> > > > > It's me again, I basically got no reply for this iget5_locked patch
> > > > > I have now. Would there be any objections if I try push it to Marcelo
> > > > > tomorrow? ;)
> > > > I just binned it. Certainly its not the kind of stuff I want to test in -ac,
> > > > too many VFS changes outside reiserfs
> > > Andrew Morton said "iget5_locked() looks simple enough, and as far as I can
> > > tell does not change any existing code - it just adds new stuff.",
> > > also this code (in its 2.5 incarnation) was tested in 2.5 for long time already.
> > > Also it fixes real bug (and while I have another reiserfs-only fix for the bug,
> > > it is fairly inelegant).
> > I agree it should go into 2.4 but I don't think the patches you are
> > submitting should go in. From what I can see they are an older version
> > compared to what actually went into 2.5. (I am basing this on the comments
>
> What I am submitting is just changesets 1.373.172.1..1.373.172.6 from
> 2.5 bk tree. So these patches are what went into 2.5 (plus all the bugs I
> have made during adapting these to 2.4, of course).
That's ok then.
> > to the functions rather than thorough code comparisons but I don't have
> > time to look at it more in depth atm.) Why don't you use the actual 2.5
> > code and make new patches or at least make use of the patches that finally
> > went into 2.5?
>
> Looking at the changelog, it seems much later on there were ifind_fast() and ifind()
> additions to this code, but I was not sure I should take these too.
> I can though, if people think that would be useful.
Up to you. Would be nice to have both. The code with the ifind() and
ilookup() functions has existed for longer I think so if your argument
is that the code has been tested in 2.5 already so can go in 2.4 then
taking that is probably better to take these, too.
Best regards,
Anton
--
Anton Altaparmakov <aia21 at cantab.net> (replace at with @)
Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net
WWW: http://linux-ntfs.sf.net/ & http://www-stu.christs.cam.ac.uk/~aia21/
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: 2.4 iget5_locked port attempt to 2.4
2003-03-03 16:27 ` Anton Altaparmakov
@ 2003-03-03 16:45 ` Oleg Drokin
0 siblings, 0 replies; 22+ messages in thread
From: Oleg Drokin @ 2003-03-03 16:45 UTC (permalink / raw)
To: Anton Altaparmakov
Cc: Andrew Morton, mason, trond.myklebust, jaharkes,
Linux Kernel Mailing List
Hello!
On Mon, Mar 03, 2003 at 04:27:20PM +0000, Anton Altaparmakov wrote:
> > > to the functions rather than thorough code comparisons but I don't have
> > > time to look at it more in depth atm.) Why don't you use the actual 2.5
> > > code and make new patches or at least make use of the patches that finally
> > > went into 2.5?
> > Looking at the changelog, it seems much later on there were ifind_fast() and ifind()
> > additions to this code, but I was not sure I should take these too.
> > I can though, if people think that would be useful.
> Up to you. Would be nice to have both. The code with the ifind() and
> ilookup() functions has existed for longer I think so if your argument
> is that the code has been tested in 2.5 already so can go in 2.4 then
> taking that is probably better to take these, too.
Well, two patches from you that implement these (merged into 2.5 as of
September 18th, 2002) applied cleanly to previously posted patch ;)
And the result even compiled.
Resulting diff is below.
Bye,
Oleg
===== Documentation/filesystems/Locking 1.7 vs edited =====
--- 1.7/Documentation/filesystems/Locking Thu Dec 19 05:34:24 2002
+++ edited/Documentation/filesystems/Locking Fri Feb 21 14:19:38 2003
@@ -114,7 +114,7 @@
remount_fs: yes yes maybe (see below)
umount_begin: yes no maybe (see below)
-->read_inode() is not a method - it's a callback used in iget()/iget4().
+->read_inode() is not a method - it's a callback used in iget().
rules for mount_sem are not too nice - it is going to die and be replaced
by better scheme anyway.
===== fs/Makefile 1.16 vs edited =====
--- 1.16/fs/Makefile Thu Sep 12 04:00:00 2002
+++ edited/fs/Makefile Fri Feb 21 14:24:21 2003
@@ -7,7 +7,7 @@
O_TARGET := fs.o
-export-objs := filesystems.o open.o dcache.o buffer.o
+export-objs := filesystems.o open.o dcache.o buffer.o inode.o
mod-subdirs := nls
obj-y := open.o read_write.o devices.o file_table.o buffer.o \
===== fs/inode.c 1.36 vs edited =====
--- 1.36/fs/inode.c Thu Aug 29 07:02:23 2002
+++ edited/fs/inode.c Mon Mar 3 19:32:54 2003
@@ -17,6 +17,7 @@
#include <linux/swapctl.h>
#include <linux/prefetch.h>
#include <linux/locks.h>
+#include <linux/module.h>
/*
* New inode.c implementation.
@@ -692,7 +693,7 @@
invalidate_buffers(dev);
return res;
}
-
+EXPORT_SYMBOL(unlock_new_inode);
/*
* This is called with the inode lock held. It searches
@@ -783,7 +784,32 @@
* by hand after calling find_inode now! This simplifies iunique and won't
* add any additional branch in the common code.
*/
-static struct inode * find_inode(struct super_block * sb, unsigned long ino, struct list_head *head, find_inode_t find_actor, void *opaque)
+static struct inode * find_inode(struct super_block * sb, struct list_head *head, int (*test)(struct inode *, void *), void *data)
+{
+ struct list_head *tmp;
+ struct inode * inode;
+
+ tmp = head;
+ for (;;) {
+ tmp = tmp->next;
+ inode = NULL;
+ if (tmp == head)
+ break;
+ inode = list_entry(tmp, struct inode, i_hash);
+ if (inode->i_sb != sb)
+ continue;
+ if (!test(inode, data))
+ continue;
+ break;
+ }
+ return inode;
+}
+
+/*
+ * find_inode_fast is the fast path version of find_inode, see the comment at
+ * iget_locked for details.
+ */
+static struct inode * find_inode_fast(struct super_block * sb, struct list_head *head, unsigned long ino)
{
struct list_head *tmp;
struct inode * inode;
@@ -799,8 +825,6 @@
continue;
if (inode->i_sb != sb)
continue;
- if (find_actor && !find_actor(inode, ino, opaque))
- continue;
break;
}
return inode;
@@ -832,13 +856,28 @@
return inode;
}
+void unlock_new_inode(struct inode *inode)
+{
+ /*
+ * This is special! We do not need the spinlock
+ * when clearing I_LOCK, because we're guaranteed
+ * that nobody else tries to do anything about the
+ * state of the inode when it is locked, as we
+ * just created it (so there can be no old holders
+ * that haven't tested I_LOCK).
+ */
+ inode->i_state &= ~(I_LOCK|I_NEW);
+ wake_up(&inode->i_wait);
+}
+
+
/*
* This is called without the inode lock held.. Be careful.
*
* We no longer cache the sb_flags in i_flags - see fs.h
* -- rmk@arm.uk.linux.org
*/
-static struct inode * get_new_inode(struct super_block *sb, unsigned long ino, struct list_head *head, find_inode_t find_actor, void *opaque)
+static struct inode * get_new_inode(struct super_block *sb, struct list_head *head, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data)
{
struct inode * inode;
@@ -848,37 +887,68 @@
spin_lock(&inode_lock);
/* We released the lock, so.. */
- old = find_inode(sb, ino, head, find_actor, opaque);
+ old = find_inode(sb, head, test, data);
if (!old) {
+ if (set(inode, data))
+ goto set_failed;
+
inodes_stat.nr_inodes++;
list_add(&inode->i_list, &inode_in_use);
list_add(&inode->i_hash, head);
- inode->i_ino = ino;
- inode->i_state = I_LOCK;
+ inode->i_state = I_LOCK|I_NEW;
spin_unlock(&inode_lock);
- /* reiserfs specific hack right here. We don't
- ** want this to last, and are looking for VFS changes
- ** that will allow us to get rid of it.
- ** -- mason@suse.com
- */
- if (sb->s_op->read_inode2) {
- sb->s_op->read_inode2(inode, opaque) ;
- } else {
- sb->s_op->read_inode(inode);
- }
-
- /*
- * This is special! We do not need the spinlock
- * when clearing I_LOCK, because we're guaranteed
- * that nobody else tries to do anything about the
- * state of the inode when it is locked, as we
- * just created it (so there can be no old holders
- * that haven't tested I_LOCK).
+ /* Return the locked inode with I_NEW set, the
+ * caller is responsible for filling in the contents
*/
- inode->i_state &= ~I_LOCK;
- wake_up(&inode->i_wait);
+ return inode;
+ }
+ /*
+ * Uhhuh, somebody else created the same inode under
+ * us. Use the old inode instead of the one we just
+ * allocated.
+ */
+ __iget(old);
+ spin_unlock(&inode_lock);
+ destroy_inode(inode);
+ inode = old;
+ wait_on_inode(inode);
+ }
+ return inode;
+
+set_failed:
+ spin_unlock(&inode_lock);
+ destroy_inode(inode);
+ return NULL;
+}
+
+/*
+ * get_new_inode_fast is the fast path version of get_new_inode, see the
+ * comment at iget_locked for details.
+ */
+static struct inode * get_new_inode_fast(struct super_block *sb, struct list_head *head, unsigned long ino)
+{
+ struct inode * inode;
+
+ inode = alloc_inode(sb);
+ if (inode) {
+ struct inode * old;
+
+ spin_lock(&inode_lock);
+ /* We released the lock, so.. */
+ old = find_inode_fast(sb, head, ino);
+ if (!old) {
+ inode->i_ino = ino;
+ inodes_stat.nr_inodes++;
+ list_add(&inode->i_list, &inode_in_use);
+ list_add(&inode->i_hash, head);
+ inode->i_state = I_LOCK|I_NEW;
+ spin_unlock(&inode_lock);
+
+ /* Return the locked inode with I_NEW set, the
+ * caller is responsible for filling in the contents
+ */
return inode;
}
@@ -896,9 +966,9 @@
return inode;
}
-static inline unsigned long hash(struct super_block *sb, unsigned long i_ino)
+static inline unsigned long hash(struct super_block *sb, unsigned long hashval)
{
- unsigned long tmp = i_ino + ((unsigned long) sb / L1_CACHE_BYTES);
+ unsigned long tmp = hashval + ((unsigned long) sb / L1_CACHE_BYTES);
tmp = tmp + (tmp >> I_HASHBITS);
return tmp & I_HASHMASK;
}
@@ -930,7 +1000,8 @@
retry:
if (counter > max_reserved) {
head = inode_hashtable + hash(sb,counter);
- inode = find_inode(sb, res = counter++, head, NULL, NULL);
+ res = counter++;
+ inode = find_inode_fast(sb, head, res);
if (!inode) {
spin_unlock(&inode_lock);
return res;
@@ -958,14 +1029,63 @@
return inode;
}
+/**
+ * ifind - internal function, you want ilookup5() or iget5().
+ * @sb: super block of file system to search
+ * @hashval: hash value (usually inode number) to search for
+ * @test: callback used for comparisons between inodes
+ * @data: opaque data pointer to pass to @test
+ *
+ * ifind() searches for the inode specified by @hashval and @data in the inode
+ * cache. This is a generalized version of ifind_fast() for file systems where
+ * the inode number is not sufficient for unique identification of an inode.
+ *
+ * If the inode is in the cache, the inode is returned with an incremented
+ * reference count.
+ *
+ * Otherwise NULL is returned.
+ *
+ * Note, @test is called with the inode_lock held, so can't sleep.
+ */
+static inline struct inode *ifind(struct super_block *sb,
+ struct list_head *head, int (*test)(struct inode *, void *),
+ void *data)
+{
+ struct inode *inode;
+
+ spin_lock(&inode_lock);
+ inode = find_inode(sb, head, test, data);
+ if (inode) {
+ __iget(inode);
+ spin_unlock(&inode_lock);
+ wait_on_inode(inode);
+ return inode;
+ }
+ spin_unlock(&inode_lock);
+ return NULL;
+}
-struct inode *iget4(struct super_block *sb, unsigned long ino, find_inode_t find_actor, void *opaque)
+/**
+ * ifind_fast - internal function, you want ilookup() or iget().
+ * @sb: super block of file system to search
+ * @ino: inode number to search for
+ *
+ * ifind_fast() searches for the inode @ino in the inode cache. This is for
+ * file systems where the inode number is sufficient for unique identification
+ * of an inode.
+ *
+ * If the inode is in the cache, the inode is returned with an incremented
+ * reference count.
+ *
+ * Otherwise NULL is returned.
+ */
+static inline struct inode *ifind_fast(struct super_block *sb,
+ struct list_head *head, unsigned long ino)
{
- struct list_head * head = inode_hashtable + hash(sb,ino);
- struct inode * inode;
+ struct inode *inode;
spin_lock(&inode_lock);
- inode = find_inode(sb, ino, head, find_actor, opaque);
+ inode = find_inode_fast(sb, head, ino);
if (inode) {
__iget(inode);
spin_unlock(&inode_lock);
@@ -973,27 +1093,147 @@
return inode;
}
spin_unlock(&inode_lock);
+ return NULL;
+}
+
+/**
+ * ilookup5 - search for an inode in the inode cache
+ * @sb: super block of file system to search
+ * @hashval: hash value (usually inode number) to search for
+ * @test: callback used for comparisons between inodes
+ * @data: opaque data pointer to pass to @test
+ *
+ * ilookup5() uses ifind() to search for the inode specified by @hashval and
+ * @data in the inode cache. This is a generalized version of ilookup() for
+ * file systems where the inode number is not sufficient for unique
+ * identification of an inode.
+ *
+ * If the inode is in the cache, the inode is returned with an incremented
+ * reference count.
+ *
+ * Otherwise NULL is returned.
+ *
+ * Note, @test is called with the inode_lock held, so can't sleep.
+ */
+struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
+ int (*test)(struct inode *, void *), void *data)
+{
+ struct list_head *head = inode_hashtable + hash(sb, hashval);
+ return ifind(sb, head, test, data);
+}
+EXPORT_SYMBOL(ilookup5);
+
+/**
+ * ilookup - search for an inode in the inode cache
+ * @sb: super block of file system to search
+ * @ino: inode number to search for
+ *
+ * ilookup() uses ifind_fast() to search for the inode @ino in the inode cache.
+ * This is for file systems where the inode number is sufficient for unique
+ * identification of an inode.
+ *
+ * If the inode is in the cache, the inode is returned with an incremented
+ * reference count.
+ *
+ * Otherwise NULL is returned.
+ */
+struct inode *ilookup(struct super_block *sb, unsigned long ino)
+{
+ struct list_head *head = inode_hashtable + hash(sb, ino);
+
+ return ifind_fast(sb, head, ino);
+}
+EXPORT_SYMBOL(ilookup);
+
+/**
+ * iget5_locked - obtain an inode from a mounted file system
+ * @sb: super block of file system
+ * @hashval: hash value (usually inode number) to get
+ * @test: callback used for comparisons between inodes
+ * @set: callback used to initialize a new struct inode
+ * @data: opaque data pointer to pass to @test and @set
+ *
+ * This is iget() without the read_inode() portion of get_new_inode().
+ *
+ * iget5_locked() uses ifind() to search for the inode specified by @hashval
+ * and @data in the inode cache and if present it is returned with an increased
+ * reference count. This is a generalized version of iget_locked() for file
+ * systems where the inode number is not sufficient for unique identification
+ * of an inode.
+ *
+ * If the inode is not in cache, get_new_inode() is called to allocate a new
+ * inode and this is returned locked, hashed, and with the I_NEW flag set. The
+ * file system gets to fill it in before unlocking it via unlock_new_inode().
+ *
+ * Note both @test and @set are called with the inode_lock held, so can't sleep.
+ */
+struct inode *iget5_locked(struct super_block *sb, unsigned long hashval,
+ int (*test)(struct inode *, void *),
+ int (*set)(struct inode *, void *), void *data)
+{
+ struct list_head *head = inode_hashtable + hash(sb, hashval);
+ struct inode *inode;
+
+ inode = ifind(sb, head, test, data);
+ if (inode)
+ return inode;
/*
* get_new_inode() will do the right thing, re-trying the search
* in case it had to block at any point.
*/
- return get_new_inode(sb, ino, head, find_actor, opaque);
+ return get_new_inode(sb, head, test, set, data);
+}
+EXPORT_SYMBOL(iget5_locked);
+
+/**
+ * iget_locked - obtain an inode from a mounted file system
+ * @sb: super block of file system
+ * @ino: inode number to get
+ *
+ * This is iget() without the read_inode() portion of get_new_inode_fast().
+ *
+ * iget_locked() uses ifind_fast() to search for the inode specified by @ino in
+ * the inode cache and if present it is returned with an increased reference
+ * count. This is for file systems where the inode number is sufficient for
+ * unique identification of an inode.
+ *
+ * If the inode is not in cache, get_new_inode_fast() is called to allocate a
+ * new inode and this is returned locked, hashed, and with the I_NEW flag set.
+ * The file system gets to fill it in before unlocking it via
+ * unlock_new_inode().
+ */
+struct inode *iget_locked(struct super_block *sb, unsigned long ino)
+{
+ struct list_head *head = inode_hashtable + hash(sb, ino);
+ struct inode *inode;
+
+ inode = ifind_fast(sb, head, ino);
+ if (inode)
+ return inode;
+ /*
+ * get_new_inode_fast() will do the right thing, re-trying the search
+ * in case it had to block at any point.
+ */
+ return get_new_inode_fast(sb, head, ino);
}
+EXPORT_SYMBOL(iget_locked);
/**
- * insert_inode_hash - hash an inode
+ * __insert_inode_hash - hash an inode
* @inode: unhashed inode
+ * @hashval: unsigned long value used to locate this object in the
+ * inode_hashtable.
*
* Add an inode to the inode hash for this superblock. If the inode
* has no superblock it is added to a separate anonymous chain.
*/
-void insert_inode_hash(struct inode *inode)
+void __insert_inode_hash(struct inode *inode, unsigned long hashval)
{
struct list_head *head = &anon_hash_chain;
if (inode->i_sb)
- head = inode_hashtable + hash(inode->i_sb, inode->i_ino);
+ head = inode_hashtable + hash(inode->i_sb, hashval);
spin_lock(&inode_lock);
list_add(&inode->i_hash, head);
spin_unlock(&inode_lock);
===== fs/coda/cnode.c 1.8 vs edited =====
--- 1.8/fs/coda/cnode.c Wed May 29 19:20:33 2002
+++ edited/fs/coda/cnode.c Mon Feb 24 13:20:12 2003
@@ -27,11 +27,6 @@
return 1;
}
-static int coda_inocmp(struct inode *inode, unsigned long ino, void *opaque)
-{
- return (coda_fideq((ViceFid *)opaque, &(ITOC(inode)->c_fid)));
-}
-
static struct inode_operations coda_symlink_inode_operations = {
readlink: page_readlink,
follow_link: page_follow_link,
@@ -62,29 +57,46 @@
init_special_inode(inode, inode->i_mode, attr->va_rdev);
}
+static int coda_test_inode(struct inode *inode, void *data)
+{
+ ViceFid *fid = (ViceFid *)data;
+ return coda_fideq(&(ITOC(inode)->c_fid), fid);
+}
+
+static int coda_set_inode(struct inode *inode, void *data)
+{
+ ViceFid *fid = (ViceFid *)data;
+ ITOC(inode)->c_fid = *fid;
+ return 0;
+}
+
+static int coda_fail_inode(struct inode *inode, void *data)
+{
+ return -1;
+}
+
struct inode * coda_iget(struct super_block * sb, ViceFid * fid,
struct coda_vattr * attr)
{
struct inode *inode;
struct coda_inode_info *cii;
- ino_t ino = coda_f2i(fid);
struct coda_sb_info *sbi = coda_sbp(sb);
+ unsigned long hash = coda_f2i(fid);
- down(&sbi->sbi_iget4_mutex);
- inode = iget4(sb, ino, coda_inocmp, fid);
+ inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
if ( !inode ) {
- CDEBUG(D_CNODE, "coda_iget: no inode\n");
- up(&sbi->sbi_iget4_mutex);
return ERR_PTR(-ENOMEM);
}
- /* check if the inode is already initialized */
- cii = ITOC(inode);
- if (coda_isnullfid(&cii->c_fid))
- /* new, empty inode found... initializing */
- cii->c_fid = *fid;
- up(&sbi->sbi_iget4_mutex);
+ if (inode->i_state & I_NEW) {
+ cii = ITOC(inode);
+ /* we still need to set i_ino for things like stat(2) */
+ inode->i_ino = hash;
+ list_add(&cii->c_cilist, &sbi->sbi_cihead);
+ unlock_new_inode(inode);
+ }
+
/* always replace the attributes, type might have changed */
coda_fill_inode(inode, attr);
@@ -129,6 +141,7 @@
struct ViceFid *newfid)
{
struct coda_inode_info *cii;
+ unsigned long hash = coda_f2i(newfid);
cii = ITOC(inode);
@@ -139,17 +152,16 @@
/* XXX we probably need to hold some lock here! */
remove_inode_hash(inode);
cii->c_fid = *newfid;
- inode->i_ino = coda_f2i(newfid);
- insert_inode_hash(inode);
+ inode->i_ino = hash;
+ __insert_inode_hash(inode, hash);
}
/* convert a fid to an inode. */
struct inode *coda_fid_to_inode(ViceFid *fid, struct super_block *sb)
{
- ino_t nr;
+
struct inode *inode;
- struct coda_inode_info *cii;
- struct coda_sb_info *sbi;
+ unsigned long hash = coda_f2i(fid);
if ( !sb ) {
printk("coda_fid_to_inode: no sb!\n");
@@ -158,47 +170,29 @@
CDEBUG(D_INODE, "%s\n", coda_f2s(fid));
- sbi = coda_sbp(sb);
- nr = coda_f2i(fid);
- down(&sbi->sbi_iget4_mutex);
- inode = iget4(sb, nr, coda_inocmp, fid);
- if ( !inode ) {
- printk("coda_fid_to_inode: null from iget, sb %p, nr %ld.\n",
- sb, (long)nr);
- goto out_unlock;
- }
-
- cii = ITOC(inode);
+ inode = iget5_locked(sb, hash, coda_test_inode, coda_fail_inode, fid);
+ if ( !inode )
+ return NULL;
- /* The inode could already be purged due to memory pressure */
- if (coda_isnullfid(&cii->c_fid)) {
- inode->i_nlink = 0;
- iput(inode);
- goto out_unlock;
- }
+ /* we should never see newly created inodes because we intentionally
+ * fail in the initialization callback */
+ BUG_ON(inode->i_state & I_NEW);
CDEBUG(D_INODE, "found %ld\n", inode->i_ino);
- up(&sbi->sbi_iget4_mutex);
return inode;
-
-out_unlock:
- up(&sbi->sbi_iget4_mutex);
- return NULL;
}
/* the CONTROL inode is made without asking attributes from Venus */
int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
{
- int error = 0;
+ int error = -ENOMEM;
*inode = iget(sb, CTL_INO);
- if ( *inode ) {
+ if (*inode) {
(*inode)->i_op = &coda_ioctl_inode_operations;
(*inode)->i_fop = &coda_ioctl_operations;
(*inode)->i_mode = 0444;
error = 0;
- } else {
- error = -ENOMEM;
}
return error;
===== fs/coda/inode.c 1.9 vs edited =====
--- 1.9/fs/coda/inode.c Wed May 29 19:17:41 2002
+++ edited/fs/coda/inode.c Mon Feb 24 13:20:12 2003
@@ -34,7 +34,6 @@
/* VFS super_block ops */
static struct super_block *coda_read_super(struct super_block *, void *, int);
-static void coda_read_inode(struct inode *);
static void coda_clear_inode(struct inode *);
static void coda_put_super(struct super_block *);
static int coda_statfs(struct super_block *sb, struct statfs *buf);
@@ -42,7 +41,6 @@
/* exported operations */
struct super_operations coda_super_operations =
{
- read_inode: coda_read_inode,
clear_inode: coda_clear_inode,
put_super: coda_put_super,
statfs: coda_statfs,
@@ -179,24 +177,6 @@
printk("Coda: Bye bye.\n");
kfree(sbi);
-}
-
-/* all filling in of inodes postponed until lookup */
-static void coda_read_inode(struct inode *inode)
-{
- struct coda_sb_info *sbi = coda_sbp(inode->i_sb);
- struct coda_inode_info *cii;
-
- if (!sbi) BUG();
-
- cii = ITOC(inode);
- if (!coda_isnullfid(&cii->c_fid)) {
- printk("coda_read_inode: initialized inode");
- return;
- }
-
- cii->c_mapcount = 0;
- list_add(&cii->c_cilist, &sbi->sbi_cihead);
}
static void coda_clear_inode(struct inode *inode)
===== fs/nfs/inode.c 1.18 vs edited =====
--- 1.18/fs/nfs/inode.c Thu Aug 15 05:05:32 2002
+++ edited/fs/nfs/inode.c Mon Feb 24 12:38:30 2003
@@ -45,7 +45,6 @@
void nfs_zap_caches(struct inode *);
static void nfs_invalidate_inode(struct inode *);
-static void nfs_read_inode(struct inode *);
static void nfs_write_inode(struct inode *,int);
static void nfs_delete_inode(struct inode *);
static void nfs_put_super(struct super_block *);
@@ -55,7 +54,6 @@
static int nfs_show_options(struct seq_file *, struct vfsmount *);
static struct super_operations nfs_sops = {
- read_inode: nfs_read_inode,
write_inode: nfs_write_inode,
delete_inode: nfs_delete_inode,
put_super: nfs_put_super,
@@ -92,30 +90,6 @@
return nfs_fileid_to_ino_t(fattr->fileid);
}
-/*
- * The "read_inode" function doesn't actually do anything:
- * the real data is filled in later in nfs_fhget. Here we
- * just mark the cache times invalid, and zero out i_mode
- * (the latter makes "nfs_refresh_inode" do the right thing
- * wrt pipe inodes)
- */
-static void
-nfs_read_inode(struct inode * inode)
-{
- inode->i_blksize = inode->i_sb->s_blocksize;
- inode->i_mode = 0;
- inode->i_rdev = 0;
- /* We can't support UPDATE_ATIME(), since the server will reset it */
- inode->i_flags |= S_NOATIME;
- INIT_LIST_HEAD(&inode->u.nfs_i.read);
- INIT_LIST_HEAD(&inode->u.nfs_i.dirty);
- INIT_LIST_HEAD(&inode->u.nfs_i.commit);
- INIT_LIST_HEAD(&inode->u.nfs_i.writeback);
- NFS_CACHEINV(inode);
- NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
- NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
-}
-
static void
nfs_write_inode(struct inode *inode, int sync)
{
@@ -634,7 +608,6 @@
* do this once. (We don't allow inodes to change types.)
*/
if (inode->i_mode == 0) {
- NFS_FILEID(inode) = fattr->fileid;
inode->i_mode = fattr->mode;
/* Why so? Because we want revalidate for devices/FIFOs, and
* that's precisely what we have in nfs_file_inode_operations.
@@ -650,9 +623,7 @@
inode->i_op = &nfs_symlink_inode_operations;
else
init_special_inode(inode, inode->i_mode, fattr->rdev);
- memcpy(&inode->u.nfs_i.fh, fh, sizeof(inode->u.nfs_i.fh));
}
- nfs_refresh_inode(inode, fattr);
}
struct nfs_find_desc {
@@ -667,7 +638,7 @@
* i_ino.
*/
static int
-nfs_find_actor(struct inode *inode, unsigned long ino, void *opaque)
+nfs_find_actor(struct inode *inode, void *opaque)
{
struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
struct nfs_fh *fh = desc->fh;
@@ -685,6 +656,18 @@
return 1;
}
+static int
+nfs_init_locked(struct inode *inode, void *opaque)
+{
+ struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
+ struct nfs_fh *fh = desc->fh;
+ struct nfs_fattr *fattr = desc->fattr;
+
+ NFS_FILEID(inode) = fattr->fileid;
+ memcpy(NFS_FH(inode), fh, sizeof(struct nfs_fh));
+ return 0;
+}
+
/*
* This is our own version of iget that looks up inodes by file handle
* instead of inode number. We use this technique instead of using
@@ -712,7 +695,7 @@
{
struct nfs_find_desc desc = { fh, fattr };
struct inode *inode = NULL;
- unsigned long ino;
+ unsigned long hash;
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
goto out_no_inode;
@@ -722,12 +705,29 @@
goto out_no_inode;
}
- ino = nfs_fattr_to_ino_t(fattr);
+ hash = nfs_fattr_to_ino_t(fattr);
- if (!(inode = iget4(sb, ino, nfs_find_actor, &desc)))
+ if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
goto out_no_inode;
- nfs_fill_inode(inode, fh, fattr);
+ if (inode->i_state & I_NEW) {
+ inode->i_ino = hash;
+ inode->i_blksize = inode->i_sb->s_blocksize;
+ inode->i_mode = 0;
+ inode->i_rdev = 0;
+ /* We can't support UPDATE_ATIME(), since the server will reset it */
+ inode->i_flags |= S_NOATIME;
+ INIT_LIST_HEAD(&inode->u.nfs_i.read);
+ INIT_LIST_HEAD(&inode->u.nfs_i.dirty);
+ INIT_LIST_HEAD(&inode->u.nfs_i.commit);
+ INIT_LIST_HEAD(&inode->u.nfs_i.writeback);
+ NFS_CACHEINV(inode);
+ NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
+ NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
+ nfs_fill_inode(inode, fh, fattr);
+ unlock_new_inode(inode);
+ } else
+ nfs_refresh_inode(inode, fattr);
dprintk("NFS: __nfs_fhget(%x/%Ld ct=%d)\n",
inode->i_dev, (long long)NFS_FILEID(inode),
atomic_read(&inode->i_count));
===== fs/reiserfs/inode.c 1.42 vs edited =====
--- 1.42/fs/reiserfs/inode.c Thu Feb 13 15:42:42 2003
+++ edited/fs/reiserfs/inode.c Fri Feb 21 14:29:42 2003
@@ -30,7 +30,7 @@
lock_kernel() ;
/* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
- if (INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
+ if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
down (&inode->i_sem);
journal_begin(&th, inode->i_sb, jbegin_count) ;
@@ -887,7 +887,7 @@
// item version directly
//
-// called by read_inode
+// called by read_locked_inode
static void init_inode (struct inode * inode, struct path * path)
{
struct buffer_head * bh;
@@ -1127,27 +1127,24 @@
make_bad_inode(inode);
}
-void reiserfs_read_inode(struct inode *inode) {
- reiserfs_make_bad_inode(inode) ;
+int reiserfs_init_locked_inode (struct inode * inode, void *p)
+{
+ struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p ;
+ inode->i_ino = args->objectid;
+ INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
+ return 0;
}
-
/* looks for stat data in the tree, and fills up the fields of in-core
inode stat data fields */
-void reiserfs_read_inode2 (struct inode * inode, void *p)
+void reiserfs_read_locked_inode (struct inode * inode, struct reiserfs_iget_args *args)
{
INITIALIZE_PATH (path_to_sd);
struct cpu_key key;
- struct reiserfs_iget4_args *args = (struct reiserfs_iget4_args *)p ;
unsigned long dirino;
int retval;
- if (!p) {
- reiserfs_make_bad_inode(inode) ;
- return;
- }
-
- dirino = args->objectid ;
+ dirino = args->dirid ;
/* set version 1, version 2 could be used too, because stat data
key is the same in both versions */
@@ -1160,7 +1157,7 @@
/* look for the object's stat data */
retval = search_item (inode->i_sb, &key, &path_to_sd);
if (retval == IO_ERROR) {
- reiserfs_warning ("vs-13070: reiserfs_read_inode2: "
+ reiserfs_warning ("vs-13070: reiserfs_read_locked_inode: "
"i/o failure occurred trying to find stat data of %K\n",
&key);
reiserfs_make_bad_inode(inode) ;
@@ -1192,7 +1189,7 @@
during mount (fs/reiserfs/super.c:finish_unfinished()). */
if( ( inode -> i_nlink == 0 ) &&
! inode -> i_sb -> u.reiserfs_sb.s_is_unlinked_ok ) {
- reiserfs_warning( "vs-13075: reiserfs_read_inode2: "
+ reiserfs_warning( "vs-13075: reiserfs_read_locked_inode: "
"dead inode read from disk %K. "
"This is likely to be race with knfsd. Ignore\n",
&key );
@@ -1204,38 +1201,43 @@
}
/**
- * reiserfs_find_actor() - "find actor" reiserfs supplies to iget4().
+ * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
*
* @inode: inode from hash table to check
- * @inode_no: inode number we are looking for
- * @opaque: "cookie" passed to iget4(). This is &reiserfs_iget4_args.
+ * @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
*
- * This function is called by iget4() to distinguish reiserfs inodes
+ * This function is called by iget5_locked() to distinguish reiserfs inodes
* having the same inode numbers. Such inodes can only exist due to some
* error condition. One of them should be bad. Inodes with identical
* inode numbers (objectids) are distinguished by parent directory ids.
*
*/
-static int reiserfs_find_actor( struct inode *inode,
- unsigned long inode_no, void *opaque )
+int reiserfs_find_actor( struct inode *inode, void *opaque )
{
- struct reiserfs_iget4_args *args;
+ struct reiserfs_iget_args *args;
args = opaque;
/* args is already in CPU order */
- return le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args -> objectid;
+ return (inode->i_ino == args->objectid) &&
+ (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
}
struct inode * reiserfs_iget (struct super_block * s, const struct cpu_key * key)
{
struct inode * inode;
- struct reiserfs_iget4_args args ;
+ struct reiserfs_iget_args args ;
- args.objectid = key->on_disk_key.k_dir_id ;
- inode = iget4 (s, key->on_disk_key.k_objectid,
- reiserfs_find_actor, (void *)(&args));
+ args.objectid = key->on_disk_key.k_objectid ;
+ args.dirid = key->on_disk_key.k_dir_id ;
+ inode = iget5_locked (s, key->on_disk_key.k_objectid,
+ reiserfs_find_actor, reiserfs_init_locked_inode, (void *)(&args));
if (!inode)
return ERR_PTR(-ENOMEM) ;
+
+ if (inode->i_state & I_NEW) {
+ reiserfs_read_locked_inode(inode, &args);
+ unlock_new_inode(inode);
+ }
if (comp_short_keys (INODE_PKEY (inode), key) || is_bad_inode (inode)) {
/* either due to i/o error or a stale NFS handle */
===== fs/reiserfs/super.c 1.27 vs edited =====
--- 1.27/fs/reiserfs/super.c Wed Oct 30 19:42:36 2002
+++ edited/fs/reiserfs/super.c Fri Feb 21 14:28:06 2003
@@ -381,8 +381,6 @@
struct super_operations reiserfs_sops =
{
- read_inode: reiserfs_read_inode,
- read_inode2: reiserfs_read_inode2,
write_inode: reiserfs_write_inode,
dirty_inode: reiserfs_dirty_inode,
delete_inode: reiserfs_delete_inode,
@@ -1117,7 +1115,7 @@
int old_format = 0;
unsigned long blocks;
int jinit_done = 0 ;
- struct reiserfs_iget4_args args ;
+ struct reiserfs_iget_args args ;
int old_magic;
struct reiserfs_super_block * rs;
@@ -1194,11 +1192,17 @@
printk("clm-7000: Detected readonly device, marking FS readonly\n") ;
s->s_flags |= MS_RDONLY ;
}
- args.objectid = REISERFS_ROOT_PARENT_OBJECTID ;
- root_inode = iget4 (s, REISERFS_ROOT_OBJECTID, 0, (void *)(&args));
+ args.objectid = REISERFS_ROOT_OBJECTID ;
+ args.dirid = REISERFS_ROOT_PARENT_OBJECTID ;
+ root_inode = iget5_locked (s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor, reiserfs_init_locked_inode, (void *)(&args));
if (!root_inode) {
printk ("reiserfs_read_super: get root inode failed\n");
goto error;
+ }
+
+ if (root_inode->i_state & I_NEW) {
+ reiserfs_read_locked_inode(root_inode, &args);
+ unlock_new_inode(root_inode);
}
s->s_root = d_alloc_root(root_inode);
===== include/linux/fs.h 1.74 vs edited =====
--- 1.74/include/linux/fs.h Sat Jan 4 06:09:16 2003
+++ edited/include/linux/fs.h Mon Mar 3 19:32:51 2003
@@ -885,13 +885,6 @@
void (*read_inode) (struct inode *);
- /* reiserfs kludge. reiserfs needs 64 bits of information to
- ** find an inode. We are using the read_inode2 call to get
- ** that information. We don't like this, and are waiting on some
- ** VFS changes for the real solution.
- ** iget4 calls read_inode2, iff it is defined
- */
- void (*read_inode2) (struct inode *, void *) ;
void (*dirty_inode) (struct inode *);
void (*write_inode) (struct inode *, int);
void (*put_inode) (struct inode *);
@@ -940,6 +933,7 @@
#define I_LOCK 8
#define I_FREEING 16
#define I_CLEAR 32
+#define I_NEW 64
#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
@@ -1378,19 +1372,36 @@
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
-typedef int (*find_inode_t)(struct inode *, unsigned long, void *);
-extern struct inode * iget4(struct super_block *, unsigned long, find_inode_t, void *);
+extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
+ int (*test)(struct inode *, void *), void *data);
+extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
+
+extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
+extern struct inode * iget_locked(struct super_block *, unsigned long);
+extern void unlock_new_inode(struct inode *);
+
static inline struct inode *iget(struct super_block *sb, unsigned long ino)
{
- return iget4(sb, ino, NULL, NULL);
+ struct inode *inode = iget_locked(sb, ino);
+
+ if (inode && (inode->i_state & I_NEW)) {
+ sb->s_op->read_inode(inode);
+ unlock_new_inode(inode);
+ }
+
+ return inode;
}
extern void clear_inode(struct inode *);
extern struct inode *new_inode(struct super_block *sb);
extern void remove_suid(struct inode *inode);
-extern void insert_inode_hash(struct inode *);
+extern void __insert_inode_hash(struct inode *, unsigned long hashval);
extern void remove_inode_hash(struct inode *);
+static inline void insert_inode_hash(struct inode *inode) {
+ __insert_inode_hash(inode, inode->i_ino);
+}
+
extern struct file * get_empty_filp(void);
extern void file_move(struct file *f, struct list_head *list);
extern struct buffer_head * get_hash_table(kdev_t, int, int);
===== include/linux/reiserfs_fs.h 1.26 vs edited =====
--- 1.26/include/linux/reiserfs_fs.h Mon Jan 20 13:19:30 2003
+++ edited/include/linux/reiserfs_fs.h Mon Mar 3 19:34:27 2003
@@ -1478,8 +1478,9 @@
#define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)))
#define PUT_B_I_POS_UNFM_POINTER(bh,ih,pos, val) do {*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)) = cpu_to_le32(val); } while (0)
-struct reiserfs_iget4_args {
+struct reiserfs_iget_args {
__u32 objectid ;
+ __u32 dirid ;
} ;
/***************************************************************************/
@@ -1730,8 +1731,9 @@
/* inode.c */
-void reiserfs_read_inode (struct inode * inode) ;
-void reiserfs_read_inode2(struct inode * inode, void *p) ;
+void reiserfs_read_locked_inode(struct inode * inode, struct reiserfs_iget_args *args) ;
+int reiserfs_find_actor(struct inode * inode, void *p) ;
+int reiserfs_init_locked_inode(struct inode * inode, void *p) ;
void reiserfs_delete_inode (struct inode * inode);
void reiserfs_write_inode (struct inode * inode, int) ;
struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, __u32 *data,
===== kernel/ksyms.c 1.67 vs edited =====
--- 1.67/kernel/ksyms.c Tue Oct 1 22:34:41 2002
+++ edited/kernel/ksyms.c Fri Feb 21 14:19:50 2003
@@ -140,7 +140,6 @@
EXPORT_SYMBOL(fget);
EXPORT_SYMBOL(igrab);
EXPORT_SYMBOL(iunique);
-EXPORT_SYMBOL(iget4);
EXPORT_SYMBOL(iput);
EXPORT_SYMBOL(inode_init_once);
EXPORT_SYMBOL(force_delete);
@@ -528,7 +527,7 @@
EXPORT_SYMBOL(read_ahead);
EXPORT_SYMBOL(get_hash_table);
EXPORT_SYMBOL(new_inode);
-EXPORT_SYMBOL(insert_inode_hash);
+EXPORT_SYMBOL(__insert_inode_hash);
EXPORT_SYMBOL(remove_inode_hash);
EXPORT_SYMBOL(buffer_insert_list);
EXPORT_SYMBOL(make_bad_inode);
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: 2.4 iget5_locked port attempt to 2.4
2003-03-03 15:38 ` Oleg Drokin
2003-03-03 15:57 ` Anton Altaparmakov
@ 2003-03-03 16:50 ` Jan Harkes
2003-03-03 16:57 ` Oleg Drokin
2003-03-03 17:23 ` Jan Harkes
1 sibling, 2 replies; 22+ messages in thread
From: Jan Harkes @ 2003-03-03 16:50 UTC (permalink / raw)
To: Oleg Drokin
Cc: Alan Cox, Andrew Morton, mason, trond.myklebust, jaharkes,
Linux Kernel Mailing List
On Mon, Mar 03, 2003 at 06:38:38PM +0300, Oleg Drokin wrote:
> Hello!
>
> On Mon, Mar 03, 2003 at 04:25:41PM +0000, Alan Cox wrote:
> > > It's me again, I basically got no reply for this iget5_locked patch
> > > I have now. Would there be any objections if I try push it to Marcelo
> > > tomorrow? ;)
> > I just binned it. Certainly its not the kind of stuff I want to test in -ac,
> > too many VFS changes outside reiserfs
>
> Andrew Morton said "iget5_locked() looks simple enough, and as far as I can
> tell does not change any existing code - it just adds new stuff.",
> also this code (in its 2.5 incarnation) was tested in 2.5 for long
> time already.
It is simple enough, and it does fixe real bug. However at the time it
was decided that the change should not go into 2.4 because it breaks the
VFS API for 3rd party filesystems. Basically anyone that might be using
iget4 and/or read_inode2 will have to change their filesystem in the
middle of a supposedly stable series.
I believe that argument still stands. Ofcourse anyone using the existing
iget4/read_inode[2] interface is pretty much guaranteed to have broken
code.
> Also it fixes real bug (and while I have another reiserfs-only fix for
> the bug, it is fairly inelegant).
Yeah, I actually hit that bug while working on Coda which prompted the
whole iget5_locked implementation. The fix I used for 2.4 is trivial but
inefficient. Just grab a lock around any call to iget4. I think I used a
semaphore as I wasn't sure whether the iget4 code would sleep.
Jan
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: 2.4 iget5_locked port attempt to 2.4
2003-03-03 16:50 ` Jan Harkes
@ 2003-03-03 16:57 ` Oleg Drokin
2003-03-03 17:23 ` Jan Harkes
1 sibling, 0 replies; 22+ messages in thread
From: Oleg Drokin @ 2003-03-03 16:57 UTC (permalink / raw)
To: Andrew Morton, mason, trond.myklebust, jaharkes,
Linux Kernel Mailing List
Hello!
On Mon, Mar 03, 2003 at 11:50:54AM -0500, Jan Harkes wrote:
> > Andrew Morton said "iget5_locked() looks simple enough, and as far as I can
> > tell does not change any existing code - it just adds new stuff.",
> > also this code (in its 2.5 incarnation) was tested in 2.5 for long
> > time already.
> It is simple enough, and it does fixe real bug. However at the time it
> was decided that the change should not go into 2.4 because it breaks the
> VFS API for 3rd party filesystems. Basically anyone that might be using
> iget4 and/or read_inode2 will have to change their filesystem in the
> middle of a supposedly stable series.
That argument never worked in case that change was imposed by fixing a bug.
> I believe that argument still stands. Ofcourse anyone using the existing
> iget4/read_inode[2] interface is pretty much guaranteed to have broken
> code.
Yes, and this is the problem, I think.
> > Also it fixes real bug (and while I have another reiserfs-only fix for
> > the bug, it is fairly inelegant).
> Yeah, I actually hit that bug while working on Coda which prompted the
> whole iget5_locked implementation. The fix I used for 2.4 is trivial but
And we hit this same bug too, recently (took quite a while to find out what's
going on and why do we suddenly have directory entries pointing to nowhere
and lost files).
> inefficient. Just grab a lock around any call to iget4. I think I used a
> semaphore as I wasn't sure whether the iget4 code would sleep.
This is inefficient, as you have noticed already ;)
Bye,
Oleg
^ permalink raw reply [flat|nested] 22+ messages in thread* Re: 2.4 iget5_locked port attempt to 2.4
2003-03-03 16:50 ` Jan Harkes
2003-03-03 16:57 ` Oleg Drokin
@ 2003-03-03 17:23 ` Jan Harkes
1 sibling, 0 replies; 22+ messages in thread
From: Jan Harkes @ 2003-03-03 17:23 UTC (permalink / raw)
To: Linux Kernel Mailing List
On Mon, Mar 03, 2003 at 11:50:54AM -0500, Jan Harkes wrote:
> Yeah, I actually hit that bug while working on Coda which prompted the
> whole iget5_locked implementation.
Hmm, I seem to be misrepresenting my role with this statement.
Yes, I found the bug in Coda, but the actual iget5_locked implementation
was largely based on the icreate patches from XFS that were sent to me
by Steve Lord.
There was a whole discussion on linux-fsdevel where Alexander Viro,
Anton Altaparmakov, Steve Lord, Christoph Hellwig, Chris Mason, and
probably others which I forgot all gave input and comments which I
merged into the patches before they were submitted to Linus.
Just to give credit where credit is due.
Jan
^ permalink raw reply [flat|nested] 22+ messages in thread