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authorLinus Torvalds <torvalds@g5.osdl.org>2005-08-19 18:02:56 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-08-19 18:02:56 -0700
commitcc314eef0128a807e50fa03baf2d0abc0647952c (patch)
tree8e38db1be28006894915273b3f3cb3beaa6efda3 /fs/sysfs/symlink.c
parent2fb1e3086df9b454538491fba8121298da37cd23 (diff)
downloadblackbird-op-linux-cc314eef0128a807e50fa03baf2d0abc0647952c.tar.gz
blackbird-op-linux-cc314eef0128a807e50fa03baf2d0abc0647952c.zip
Fix nasty ncpfs symlink handling bug.
This bug could cause oopses and page state corruption, because ncpfs used the generic page-cache symlink handlign functions. But those functions only work if the page cache is guaranteed to be "stable", ie a page that was installed when the symlink walk was started has to still be installed in the page cache at the end of the walk. We could have fixed ncpfs to not use the generic helper routines, but it is in many ways much cleaner to instead improve on the symlink walking helper routines so that they don't require that absolute stability. We do this by allowing "follow_link()" to return a error-pointer as a cookie, which is fed back to the cleanup "put_link()" routine. This also simplifies NFS symlink handling. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/sysfs/symlink.c')
-rw-r--r--fs/sysfs/symlink.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index fae57c83a722..de402fa915f2 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -151,17 +151,17 @@ static int sysfs_getlink(struct dentry *dentry, char * path)
}
-static int sysfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *sysfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
int error = -ENOMEM;
unsigned long page = get_zeroed_page(GFP_KERNEL);
if (page)
error = sysfs_getlink(dentry, (char *) page);
nd_set_link(nd, error ? ERR_PTR(error) : (char *)page);
- return 0;
+ return NULL;
}
-static void sysfs_put_link(struct dentry *dentry, struct nameidata *nd)
+static void sysfs_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
{
char *page = nd_get_link(nd);
if (!IS_ERR(page))
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