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authorMichael Kerrisk <mtk.manpages@googlemail.com>2008-06-09 21:16:07 -0700
committerAl Viro <viro@zeniv.linux.org.uk>2008-06-23 08:43:03 -0400
commit12fd0d3088d27867be68655bcab2b074f2835f60 (patch)
tree088cf4d5ffc4f4f094b443f1186250403d296132 /fs
parentfe6e9c1f25ac01f848bd084ee0ee62a5a0966ff3 (diff)
downloadlinux-12fd0d3088d27867be68655bcab2b074f2835f60.tar.bz2
[patch for 2.6.26 2/4] vfs: utimensat(): be consistent with utime() for immutable and append-only files
This patch fixes utimensat() to make its behavior consistent with that of utime()/utimes() when dealing with files marked immutable and append-only. The current utimensat() implementation also returns EPERM if 'times' is non-NULL and the tv_nsec fields are both UTIME_NOW. For consistency, the (times != NULL && times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) case should be treated like the traditional utimes() case where 'times' is NULL. That is, the call should succeed for a file marked append-only and should give the error EACCES if the file is marked as immutable. The simple way to do this is to set 'times' to NULL if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW). This is also the natural approach, since POSIX.1 semantics consider the times == {{x, UTIME_NOW}, {y, UTIME_NOW}} to be exactly equivalent to the case for times == NULL. (Thanks to Miklos for pointing this out.) Patch 3 in this series relies on the simplification provided by this patch. Acked-by: Miklos Szeredi <miklos@szeredi.hu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/utimes.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/utimes.c b/fs/utimes.c
index af059d5cb485..14d3edbb3d7c 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -102,6 +102,10 @@ long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags
if (error)
goto dput_and_out;
+ if (times && times[0].tv_nsec == UTIME_NOW &&
+ times[1].tv_nsec == UTIME_NOW)
+ times = NULL;
+
/* Don't worry, the checks are done in inode_change_ok() */
newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
if (times) {