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authorAl Viro <viro@www.linux.org.uk>2005-06-06 13:35:58 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-06 14:42:24 -0700
commit90ebe5654febe3555a2516d51d3d251226d35fdb (patch)
tree576e1b58886329a4ea0c8a4b20416ce0dead0e51 /fs/namei.c
parent4481e8eea761857367162b0957277d5524fbea63 (diff)
downloadop-kernel-dev-90ebe5654febe3555a2516d51d3d251226d35fdb.zip
op-kernel-dev-90ebe5654febe3555a2516d51d3d251226d35fdb.tar.gz
[PATCH] namei fixes
OK, here comes a patch series that hopefully should close all too-early-mntput() races in fs/namei.c. Entire area is convoluted as hell, so I'm splitting that series into _very_ small chunks. Patches alread in the tree close only (very wide) races in following symlinks (see "busy inodes after umount" thread some time ago). Unfortunately, quite a few narrower races of the same nature were not closed. Hopefully this should take care of all of them. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/fs/namei.c b/fs/namei.c
index dd78f01..abeec34 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -493,6 +493,11 @@ fail:
return PTR_ERR(link);
}
+struct path {
+ struct vfsmount *mnt;
+ struct dentry *dentry;
+};
+
static inline int __do_follow_link(struct dentry *dentry, struct nameidata *nd)
{
int error;
@@ -518,7 +523,7 @@ static inline int __do_follow_link(struct dentry *dentry, struct nameidata *nd)
* Without that kind of total limit, nasty chains of consecutive
* symlinks can cause almost arbitrarily long lookups.
*/
-static inline int do_follow_link(struct dentry *dentry, struct nameidata *nd)
+static inline int do_follow_link(struct path *path, struct nameidata *nd)
{
int err = -ELOOP;
if (current->link_count >= MAX_NESTED_LINKS)
@@ -527,13 +532,13 @@ static inline int do_follow_link(struct dentry *dentry, struct nameidata *nd)
goto loop;
BUG_ON(nd->depth >= MAX_NESTED_LINKS);
cond_resched();
- err = security_inode_follow_link(dentry, nd);
+ err = security_inode_follow_link(path->dentry, nd);
if (err)
goto loop;
current->link_count++;
current->total_link_count++;
nd->depth++;
- err = __do_follow_link(dentry, nd);
+ err = __do_follow_link(path->dentry, nd);
current->link_count--;
nd->depth--;
return err;
@@ -641,11 +646,6 @@ static inline void follow_dotdot(struct vfsmount **mnt, struct dentry **dentry)
follow_mount(mnt, dentry);
}
-struct path {
- struct vfsmount *mnt;
- struct dentry *dentry;
-};
-
/*
* It's more convoluted than I'd like it to be, but... it's still fairly
* small and for now I'd prefer to have fast path as straight as possible.
@@ -784,7 +784,7 @@ static fastcall int __link_path_walk(const char * name, struct nameidata *nd)
if (inode->i_op->follow_link) {
mntget(next.mnt);
- err = do_follow_link(next.dentry, nd);
+ err = do_follow_link(&next, nd);
dput(next.dentry);
mntput(next.mnt);
if (err)
@@ -838,7 +838,7 @@ last_component:
if ((lookup_flags & LOOKUP_FOLLOW)
&& inode && inode->i_op && inode->i_op->follow_link) {
mntget(next.mnt);
- err = do_follow_link(next.dentry, nd);
+ err = do_follow_link(&next, nd);
dput(next.dentry);
mntput(next.mnt);
if (err)
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