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authorJohn McCutchan <ttb@tentacle.dhs.org>2005-12-12 00:37:14 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-12-12 08:57:43 -0800
commit8140a5005bc6f1c9d0fa103460d50d472e6e3426 (patch)
tree9c5ae431bf1db43e3a1e7a4cceb472c76077ac18 /fs
parentb4788f6d55548e587ced330ece711456f40ec8f1 (diff)
downloadop-kernel-dev-8140a5005bc6f1c9d0fa103460d50d472e6e3426.zip
op-kernel-dev-8140a5005bc6f1c9d0fa103460d50d472e6e3426.tar.gz
[PATCH] inotify: add two inotify_add_watch flags
The below patch lets userspace have more control over the inodes that inotify will watch. It introduces two new flags. IN_ONLYDIR -- only watch the inode if it is a directory. This is needed to avoid the race that can occur when we want to be sure that we are watching a directory. IN_DONT_FOLLOW -- don't follow a symlink. In combination with IN_ONLYDIR we can make sure that we don't watch the target of symlinks. The issues the flags fix came up when writing the gnome-vfs inotify backend. Default behaviour is unchanged. Signed-off-by: John McCutchan <ttb@tentacle.dhs.org> Acked-by: Robert Love <rml@novell.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/inotify.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/inotify.c b/fs/inotify.c
index bf7ce1d..2fecb7a 100644
--- a/fs/inotify.c
+++ b/fs/inotify.c
@@ -364,11 +364,12 @@ static int inotify_dev_get_wd(struct inotify_device *dev,
/*
* find_inode - resolve a user-given path to a specific inode and return a nd
*/
-static int find_inode(const char __user *dirname, struct nameidata *nd)
+static int find_inode(const char __user *dirname, struct nameidata *nd,
+ unsigned flags)
{
int error;
- error = __user_walk(dirname, LOOKUP_FOLLOW, nd);
+ error = __user_walk(dirname, flags, nd);
if (error)
return error;
/* you can only watch an inode if you have read permissions on it */
@@ -933,6 +934,7 @@ asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
struct file *filp;
int ret, fput_needed;
int mask_add = 0;
+ unsigned flags = 0;
filp = fget_light(fd, &fput_needed);
if (unlikely(!filp))
@@ -944,7 +946,12 @@ asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
goto fput_and_out;
}
- ret = find_inode(path, &nd);
+ if (!(mask & IN_DONT_FOLLOW))
+ flags |= LOOKUP_FOLLOW;
+ if (mask & IN_ONLYDIR)
+ flags |= LOOKUP_DIRECTORY;
+
+ ret = find_inode(path, &nd, flags);
if (unlikely(ret))
goto fput_and_out;
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