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fs: remove vfs_follow_link 

For a long time no filesystem has been using vfs_follow_link, and as seen
by recent filesystem submissions any new use is accidental as well.

Remove vfs_follow_link, document the replacement in
Documentation/filesystems/porting and also rename __vfs_follow_link
to match its only caller better.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2013-09-09 07:16:41 -07:00 committed by Al Viro
parent b05430fc93
commit 4aa32895c3
3 changed files with 6 additions and 9 deletions
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4
Documentation/filesystems/porting
View File

@ -451,3 +451,7 @@ in your dentry operations instead.
--
[mandatory]
->readdir() is gone now; switch to ->iterate()
[mandatory]
vfs_follow_link has been removed. Filesystems must use nd_set_link
from ->follow_link for normal symlinks, or nd_jump_link for magic
/proc/<pid> style links.

10
fs/namei.c
View File

@ -660,7 +660,7 @@ static __always_inline void set_root_rcu(struct nameidata *nd)
}
}
static __always_inline int __vfs_follow_link(struct nameidata *nd, const char *link)
static __always_inline int __follow_link(struct nameidata *nd, const char *link)
{
int ret;
@ -874,7 +874,7 @@ follow_link(struct path *link, struct nameidata *nd, void **p)
error = 0;
s = nd_get_link(nd);
if (s) {
error = __vfs_follow_link(nd, s);
error = __follow_link(nd, s);
if (unlikely(error))
put_link(nd, link, *p);
}
@ -4236,11 +4236,6 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
return res;
}
int vfs_follow_link(struct nameidata *nd, const char *link)
{
return __vfs_follow_link(nd, link);
}
/* get the link contents into pagecache */
static char *page_getlink(struct dentry * dentry, struct page **ppage)
{
@ -4352,7 +4347,6 @@ EXPORT_SYMBOL(vfs_path_lookup);
EXPORT_SYMBOL(inode_permission);
EXPORT_SYMBOL(unlock_rename);
EXPORT_SYMBOL(vfs_create);
EXPORT_SYMBOL(vfs_follow_link);
EXPORT_SYMBOL(vfs_link);
EXPORT_SYMBOL(vfs_mkdir);
EXPORT_SYMBOL(vfs_mknod);

1
include/linux/fs.h
View File

@ -2494,7 +2494,6 @@ extern const struct file_operations generic_ro_fops;
#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
extern int vfs_follow_link(struct nameidata *, const char *);
extern int page_readlink(struct dentry *, char __user *, int);
extern void *page_follow_link_light(struct dentry *, struct nameidata *);
extern void page_put_link(struct dentry *, struct nameidata *, void *);