[PATCH 04/27] kill filp_open()

Dave Hansen
2007-11-01T23:09:34Z

Replace all callers with open_namei() directly, and move the
nameidata stack allocation into open_namei().

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
---

linux-2.6.git-dave/drivers/usb/gadget/file_storage.c | 5 -
linux-2.6.git-dave/fs/exec.c | 2
linux-2.6.git-dave/fs/namei.c | 71 +++++++++----------
linux-2.6.git-dave/fs/nfsctl.c | 5 +
linux-2.6.git-dave/fs/open.c | 6 -
linux-2.6.git-dave/fs/reiserfs/journal.c | 2
linux-2.6.git-dave/include/linux/fs.h | 3
linux-2.6.git-dave/kernel/acct.c | 2
linux-2.6.git-dave/mm/swapfile.c | 4 -
linux-2.6.git-dave/sound/sound_firmware.c | 2
10 files changed, 53 insertions(+), 49 deletions(-)

diff -puN drivers/usb/gadget/file_storage.c~kill-filp_open drivers/usb/gadget/file_storage.c
--- linux-2.6.git/drivers/usb/gadget/file_storage.c~kill-filp_open 2007-11-01 14:46:06.000000000 -0700
+++ linux-2.6.git-dave/drivers/usb/gadget/file_storage.c 2007-11-01 14:46:06.000000000 -0700
@@ -3468,16 +3468,17 @@ static int open_backing_file(struct lun
struct inode *inode = NULL;
loff_t size;
loff_t num_sectors;
+ int mode = O_LARGEFILE;

/* R/W if we can, R/O if we must */
ro = curlun->ro;
if (!ro) {
- filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
+ filp = open_namei(AT_FDCWD, filename, O_RDWR | mode, 0);
if (-EROFS == PTR_ERR(filp))
ro = 1;
}
if (ro)
- filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
+ filp = open_namei(AT_FDCWD, filename, O_RDONLY | mode, 0);
if (IS_ERR(filp)) {
LINFO(curlun, "unable to open backing file: %s\n", filename);
return PTR_ERR(filp);
diff -puN fs/exec.c~kill-filp_open fs/exec.c
--- linux-2.6.git/fs/exec.c~kill-filp_open 2007-11-01 14:46:06.000000000 -0700
+++ linux-2.6.git-dave/fs/exec.c 2007-11-01 14:46:06.000000000 -0700
@@ -1763,7 +1763,7 @@ int do_coredump(long signr, int exit_cod
goto fail_unlock;
}
} else
- file = filp_open(corename,
+ file = open_namei(AT_FDCWD, corename,
O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE | flag,
0600);
if (IS_ERR(file))
diff -puN fs/namei.c~kill-filp_open fs/namei.c
--- linux-2.6.git/fs/namei.c~kill-filp_open 2007-11-01 14:46:06.000000000 -0700
+++ linux-2.6.git-dave/fs/namei.c 2007-11-01 14:46:06.000000000 -0700
@@ -1730,9 +1730,10 @@ static inline int sys_open_flags_to_name
* system call. See sys_open_flags_to_namei_flags().
* SMP-safe
*/
-struct file *open_namei(int dfd, const char *pathname, int sys_open_flag,
- int mode, struct nameidata *nd)
+struct file *open_pathname(int dfd, const char *pathname,
+ int sys_open_flag, int mode)
{
+ struct nameidata nd;
int acc_mode, error;
struct path path;
struct dentry *dir;
@@ -1755,7 +1756,7 @@ struct file *open_namei(int dfd, const c
*/
if (!(flag & O_CREAT)) {
error = path_lookup_open(dfd, pathname, lookup_flags(flag),
- nd, flag);
+ &nd, flag);
if (error)
return ERR_PTR(error);
goto ok;
@@ -1764,7 +1765,7 @@ struct file *open_namei(int dfd, const c
/*
* Create - we need to know the parent.
*/
- error = path_lookup_create(dfd,pathname,LOOKUP_PARENT,nd,flag,mode);
+ error = path_lookup_create(dfd,pathname,LOOKUP_PARENT,&nd,flag,mode);
if (error)
return ERR_PTR(error);

@@ -1774,14 +1775,14 @@ struct file *open_namei(int dfd, const c
* will not do.
*/
error = -EISDIR;
- if (nd->last_type != LAST_NORM || nd->last.name[nd->last.len])
+ if (nd.last_type != LAST_NORM || nd.last.name[nd.last.len])
goto exit;

- dir = nd->dentry;
- nd->flags &= ~LOOKUP_PARENT;
+ dir = nd.dentry;
+ nd.flags &= ~LOOKUP_PARENT;
mutex_lock(&dir->d_inode->i_mutex);
- path.dentry = lookup_hash(nd);
- path.mnt = nd->mnt;
+ path.dentry = lookup_hash(&nd);
+ path.mnt = nd.mnt;

do_last:
error = PTR_ERR(path.dentry);
@@ -1790,18 +1791,18 @@ do_last:
goto exit;
}

- if (IS_ERR(nd->intent.open.file)) {
+ if (IS_ERR(nd.intent.open.file)) {
mutex_unlock(&dir->d_inode->i_mutex);
- error = PTR_ERR(nd->intent.open.file);
+ error = PTR_ERR(nd.intent.open.file);
goto exit_dput;
}

/* Negative dentry, just create the file */
if (!path.dentry->d_inode) {
- error = __open_namei_create(nd, &path, flag, mode);
+ error = __open_namei_create(&nd, &path, flag, mode);
if (error)
goto exit;
- return nameidata_to_filp(nd, sys_open_flag);
+ return nameidata_to_filp(&nd, sys_open_flag);
}

/*
@@ -1826,22 +1827,22 @@ do_last:
if (path.dentry->d_inode->i_op && path.dentry->d_inode->i_op->follow_link)
goto do_link;

- path_to_nameidata(&path, nd);
+ path_to_nameidata(&path, &nd);
error = -EISDIR;
if (path.dentry->d_inode && S_ISDIR(path.dentry->d_inode->i_mode))
goto exit;
ok:
- error = may_open(nd, acc_mode, flag);
+ error = may_open(&nd, acc_mode, flag);
if (error)
goto exit;
- return nameidata_to_filp(nd, sys_open_flag);
+ return nameidata_to_filp(&nd, sys_open_flag);

exit_dput:
- dput_path(&path, nd);
+ dput_path(&path, &nd);
exit:
- if (!IS_ERR(nd->intent.open.file))
- release_open_intent(nd);
- path_release(nd);
+ if (!IS_ERR(&nd.intent.open.file))
+ release_open_intent(&nd);
+ path_release(&nd);
return ERR_PTR(error);

do_link:
@@ -1855,42 +1856,42 @@ do_link:
* After that we have the parent and last component, i.e.
* we are in the same situation as after the first path_walk().
* Well, almost - if the last component is normal we get its copy
- * stored in nd->last.name and we will have to putname() it when we
+ * stored in nd.last.name and we will have to putname() it when we
* are done. Procfs-like symlinks just set LAST_BIND.
*/
- nd->flags |= LOOKUP_PARENT;
- error = security_inode_follow_link(path.dentry, nd);
+ nd.flags |= LOOKUP_PARENT;
+ error = security_inode_follow_link(path.dentry, &nd);
if (error)
goto exit_dput;
- error = __do_follow_link(&path, nd);
+ error = __do_follow_link(&path, &nd);
if (error) {
/* Does someone understand code flow here? Or it is only
* me so stupid? Anathema to whoever designed this non-sense
* with "intent.open".
*/
- release_open_intent(nd);
+ release_open_intent(&nd);
return ERR_PTR(error);
}
- nd->flags &= ~LOOKUP_PARENT;
- if (nd->last_type == LAST_BIND)
+ nd.flags &= ~LOOKUP_PARENT;
+ if (nd.last_type == LAST_BIND)
goto ok;
error = -EISDIR;
- if (nd->last_type != LAST_NORM)
+ if (nd.last_type != LAST_NORM)
goto exit;
- if (nd->last.name[nd->last.len]) {
- __putname(nd->last.name);
+ if (nd.last.name[nd.last.len]) {
+ __putname(nd.last.name);
goto exit;
}
error = -ELOOP;
if (count++==32) {
- __putname(nd->last.name);
+ __putname(nd.last.name);
goto exit;
}
- dir = nd->dentry;
+ dir = nd.dentry;
mutex_lock(&dir->d_inode->i_mutex);
- path.dentry = lookup_hash(nd);
- path.mnt = nd->mnt;
- __putname(nd->last.name);
+ path.dentry = lookup_hash(&nd);
+ path.mnt = nd.mnt;
+ __putname(nd.last.name);
goto do_last;
}

diff -puN fs/nfsctl.c~kill-filp_open fs/nfsctl.c
--- linux-2.6.git/fs/nfsctl.c~kill-filp_open 2007-11-01 14:46:06.000000000 -0700
+++ linux-2.6.git-dave/fs/nfsctl.c 2007-11-01 14:46:06.000000000 -0700
@@ -35,6 +35,11 @@ static struct file *do_open(char *name,
if (error)
return ERR_PTR(error);

+ /*
+ * If O_TRUNC is ever passed into may_open()
+ * it will be necessary to take and release
+ * mnt writer count around these calls.
+ */
if (flags == O_RDWR)
error = may_open(&nd,MAY_READ|MAY_WRITE,FMODE_READ|FMODE_WRITE);
else
diff -puN fs/open.c~kill-filp_open fs/open.c
--- linux-2.6.git/fs/open.c~kill-filp_open 2007-11-01 14:46:06.000000000 -0700
+++ linux-2.6.git-dave/fs/open.c 2007-11-01 14:46:06.000000000 -0700
@@ -802,8 +802,7 @@ cleanup_file:

struct file *filp_open(const char *filename, int flags, int mode)
{
- struct nameidata nd;
- return open_namei(AT_FDCWD, filename, flags, mode, &nd);
+ return open_namei(AT_FDCWD, filename, flags, mode);
}
EXPORT_SYMBOL(filp_open);

@@ -1007,8 +1006,7 @@ long do_sys_open(int dfd, const char __u

fd = get_unused_fd_flags(flags);
if (fd >= 0) {
- struct nameidata nd;
- struct file *f = open_namei(dfd, tmp, flags, mode, &nd);
+ struct file *f = open_pathname(dfd, tmp, flags, mode);

if (IS_ERR(f)) {
put_unused_fd(fd);
diff -puN fs/reiserfs/journal.c~kill-filp_open fs/reiserfs/journal.c
--- linux-2.6.git/fs/reiserfs/journal.c~kill-filp_open 2007-11-01 14:46:06.000000000 -0700
+++ linux-2.6.git-dave/fs/reiserfs/journal.c 2007-11-01 14:46:06.000000000 -0700
@@ -2625,7 +2625,7 @@ static int journal_init_dev(struct super
return 0;
}

- journal->j_dev_file = filp_open(jdev_name, 0, 0);
+ journal->j_dev_file = open_namei(AT_FDCWD, jdev_name, 0, 0);
if (!IS_ERR(journal->j_dev_file)) {
struct inode *jdev_inode = journal->j_dev_file->f_mapping->host;
if (!S_ISBLK(jdev_inode->i_mode)) {
diff -puN include/linux/fs.h~kill-filp_open include/linux/fs.h
--- linux-2.6.git/include/linux/fs.h~kill-filp_open 2007-11-01 14:46:06.000000000 -0700
+++ linux-2.6.git-dave/include/linux/fs.h 2007-11-01 14:46:06.000000000 -0700
@@ -1540,7 +1540,6 @@ extern int do_truncate(struct dentry *,
struct file *filp);
extern long do_sys_open(int dfd, const char __user *filename, int flags,
int mode);
-extern struct file *filp_open(const char *, int, int);
extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
extern int filp_close(struct file *, fl_owner_t id);
extern char * getname(const char __user *);
@@ -1714,7 +1713,7 @@ extern struct file *create_read_pipe(str
extern struct file *create_write_pipe(void);
extern void free_write_pipe(struct file *);

-extern struct file *open_namei(int dfd, const char *, int, int, struct nameidata *);
+extern struct file *open_pathname(int dfd, const char *, int, int);
extern int may_open(struct nameidata *, int, int);

extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
diff -puN kernel/acct.c~kill-filp_open kernel/acct.c
--- linux-2.6.git/kernel/acct.c~kill-filp_open 2007-11-01 14:46:06.000000000 -0700
+++ linux-2.6.git-dave/kernel/acct.c 2007-11-01 14:46:06.000000000 -0700
@@ -208,7 +208,7 @@ static int acct_on(char *name)
int error;

/* Difference from BSD - they don't do O_APPEND */
- file = filp_open(name, O_WRONLY|O_APPEND|O_LARGEFILE, 0);
+ file = open_namei(AT_FDCWD, name, O_WRONLY|O_APPEND|O_LARGEFILE, 0);
if (IS_ERR(file))
return PTR_ERR(file);

diff -puN mm/swapfile.c~kill-filp_open mm/swapfile.c
--- linux-2.6.git/mm/swapfile.c~kill-filp_open 2007-11-01 14:46:06.000000000 -0700
+++ linux-2.6.git-dave/mm/swapfile.c 2007-11-01 14:46:06.000000000 -0700
@@ -1191,7 +1191,7 @@ asmlinkage long sys_swapoff(const char _
if (IS_ERR(pathname))
goto out;

- victim = filp_open(pathname, O_RDWR|O_LARGEFILE, 0);
+ victim = open_namei(AT_FDCWD, pathname, O_RDWR|O_LARGEFILE, 0);
putname(pathname);
err = PTR_ERR(victim);
if (IS_ERR(victim))
@@ -1470,7 +1470,7 @@ asmlinkage long sys_swapon(const char __
name = NULL;
goto bad_swap_2;
}
- swap_file = filp_open(name, O_RDWR|O_LARGEFILE, 0);
+ swap_file = open_namei(AT_FDCWD, name, O_RDWR|O_LARGEFILE, 0);
error = PTR_ERR(swap_file);
if (IS_ERR(swap_file)) {
swap_file = NULL;
diff -puN sound/sound_firmware.c~kill-filp_open sound/sound_firmware.c
--- linux-2.6.git/sound/sound_firmware.c~kill-filp_open 2007-11-01 14:46:06.000000000 -0700
+++ linux-2.6.git-dave/sound/sound_firmware.c 2007-11-01 14:46:06.000000000 -0700
@@ -14,7 +14,7 @@ static int do_mod_firmware_load(const ch
char *dp;
loff_t pos;

- filp = filp_open(fn, 0, 0);
+ filp = open_namei(AT_FDCWD, fn, 0, 0);
if (IS_ERR(filp))
{
printk(KERN_INFO "Unable to load '%s'.\n", fn);
_