diff options
| author | Robin H. Johnson <robbat2@gentoo.org> | 2006-06-13 18:06:11 +0100 |
|---|---|---|
| committer | Chris Wright <chrisw@sous-sol.org> | 2006-06-22 12:16:12 -0700 |
| commit | 2fb0b930b535b5e7ae8a5c8880d8ba941e508421 (patch) | |
| tree | 5b0ba6b73aefa1118f84606e3c55dc374f20d52b /mm/shmem.c | |
| parent | 0bd99264e94d5bb8f8ffeed246f4414a3191d3e6 (diff) | |
[PATCH] tmpfs: time granularity fix for [acm]time going backwards
I noticed a strange behavior in a tmpfs file system the other day, while
building packages - occasionally, and seemingly at random, make decided to
rebuild a target. However, only on tmpfs.
A file would be created, and if checked, it had a sub-second timestamp.
However, after an utimes related call where sub-seconds should be set, they
were zeroed instead. In the case that a file was created, and utimes(...,NULL)
was used on it in the same second, the timestamp on the file moved backwards.
After some digging, I found that this was being caused by tmpfs not having a
time granularity set, thus inheriting the default 1 second granularity.
Hugh adds: yes, we missed tmpfs when the s_time_gran mods went into 2.6.11.
Unfortunately, the granularity of CURRENT_TIME, often used in filesystems,
does not match the default granularity set by alloc_super. A few more such
discrepancies have been found, but this is the most important to fix now.
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'mm/shmem.c')
| -rw-r--r-- | mm/shmem.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index f0eb2f265ebe..1bc2285f7469 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2100,6 +2100,7 @@ static int shmem_fill_super(struct super_block *sb, sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_magic = TMPFS_MAGIC; sb->s_op = &shmem_ops; + sb->s_time_gran = 1; inode = shmem_get_inode(sb, S_IFDIR | mode, 0); if (!inode) |