Re: 2.4 iget5_locked port attempt to 2.4

Oleg Drokin
2003-02-22T09:19:35Z

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);