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vfs: Add file timestamp range support

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Add fields to the superblock to track the min and max
timestamps supported by filesystems.

Initially, when a superblock is allocated, initialize
it to the max and min values the fields can hold.
Individual filesystems override these to match their
actual limits.

Pseudo filesystems are assumed to always support the
min and max allowable values for the fields.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
This commit is contained in:
Deepa Dinamani
2018-01-21 18:04:23 -08:00
parent a55aa89aab
commit 188d20bcd1
3 changed files with 7 additions and 0 deletions
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2
fs/super.c
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@@ -257,6 +257,8 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags,
s->s_maxbytes = MAX_NON_LFS;
s->s_op = &default_op;
s->s_time_gran = 1000000000;
s->s_time_min = TIME64_MIN;
s->s_time_max = TIME64_MAX;
s->cleancache_poolid = CLEANCACHE_NO_POOL;
s->s_shrink.seeks = DEFAULT_SEEKS;