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| author | Robin H. Johnson <robbat2@gentoo.org> | 2006-06-12 22:50:25 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-12 22:55:52 +0200 |
| commit | cfd95a9cf58cd9e92d4c23b5ee20b07a3d121477 (patch) | |
| tree | 446977d54fcf1f9e3a5c3c2f6aea1f1b1ac2f806 /mm | |
| parent | Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6 (diff) | |
| download | linux-cfd95a9cf58cd9e92d4c23b5ee20b07a3d121477.tar.xz linux-cfd95a9cf58cd9e92d4c23b5ee20b07a3d121477.zip | |
[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: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
| -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 4c5e68e4e9ae..73f7a9dfcd37 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2102,6 +2102,7 @@ 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) |