The patch titled
r/o bind mounts: elevate write count for do_sys_utime() and touch_atime()
has been added to the -mm tree. Its filename is
r-o-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: r/o bind mounts: elevate write count for do_sys_utime() and touch_atime()
From: Dave Hansen <hansendc@xxxxxxxxxx>
Signed-off-by: Dave Hansen <haveblue@xxxxxxxxxx>
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Cc: Ram Pai <linuxram@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/inode.c | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)
diff -puN fs/inode.c~r-o-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime fs/inode.c
--- a/fs/inode.c~r-o-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime
+++ a/fs/inode.c
@@ -1170,22 +1170,23 @@ void touch_atime(struct vfsmount *mnt, s
struct inode *inode = dentry->d_inode;
struct timespec now;
- if (inode->i_flags & S_NOATIME)
+ if (mnt && mnt_want_write(mnt))
return;
+ if (inode->i_flags & S_NOATIME)
+ goto out;
if (IS_NOATIME(inode))
- return;
+ goto out;
if ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode))
- return;
+ goto out;
/*
* We may have a NULL vfsmount when coming from NFSD
*/
if (mnt) {
if (mnt->mnt_flags & MNT_NOATIME)
- return;
+ goto out;
if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))
- return;
-
+ goto out;
if (mnt->mnt_flags & MNT_RELATIME) {
/*
* With relative atime, only update atime if the
@@ -1196,16 +1197,19 @@ void touch_atime(struct vfsmount *mnt, s
&inode->i_atime) < 0 &&
timespec_compare(&inode->i_ctime,
&inode->i_atime) < 0)
- return;
+ goto out;
}
}
now = current_fs_time(inode->i_sb);
if (timespec_equal(&inode->i_atime, &now))
- return;
+ goto out;
inode->i_atime = now;
mark_inode_dirty_sync(inode);
+out:
+ if (mnt)
+ mnt_drop_write(mnt);
}
EXPORT_SYMBOL(touch_atime);
_
Patches currently in -mm which might be from hansendc@xxxxxxxxxx are
r-o-bind-mounts-filesystem-helpers-for-custom-struct-files.patch
r-o-bind-mounts-add-vfsmount-writer-counts.patch
r-o-bind-mounts-record-when-sb_writer_count-elevated-for-inode.patch
r-o-bind-mounts-elevate-writer-count-for-chown-and-friends.patch
r-o-bind-mounts-elevate-mnt-writers-for-callers-of-vfs_mkdir.patch
r-o-bind-mounts-elevate-write-count-during-entire-ncp_ioctl.patch
r-o-bind-mounts-elevate-write-count-for-link-and-symlink-calls.patch
r-o-bind-mounts-elevate-mount-count-for-extended-attributes.patch
r-o-bind-mounts-mount_is_safe-add-comment.patch
r-o-bind-mounts-unix_find_other-elevate-write-count-for-touch_atime.patch
r-o-bind-mounts-elevate-write-count-over-calls-to-vfs_rename.patch
r-o-bind-mounts-elevate-write-count-files-are-opened.patch
r-o-bind-mounts-elevate-writer-count-for-do_sys_truncate.patch
r-o-bind-mounts-elevate-write-count-for-do_utimes.patch
r-o-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime.patch
r-o-bind-mounts-sys_mknodat-elevate-write-count-for-vfs_mknod-create.patch
r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers.patch
r-o-bind-mounts-do_rmdir-elevate-write-count.patch
r-o-bind-mounts-elevate-writer-count-for-custom-struct_file.patch
r-o-bind-mounts-gfs-check-nlink-count.patch
r-o-bind-mounts-honor-r-w-changes-at-do_remount-time.patch
r-o-bind-mounts-kill-open-files-traverse-on-remount-ro.patch
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