Commit 188d20bc authored by Deepa Dinamani's avatar Deepa Dinamani
Browse files

vfs: Add file timestamp range support 



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: default avatarDeepa Dinamani <deepa.kernel@gmail.com>
Acked-by: default avatarJeff Layton <jlayton@kernel.org>
parent a55aa89a

fs/super.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

include/linux/fs.h

+3 −0
Original line number Diff line number Diff line
@@ -1448,6 +1448,9 @@ struct super_block { 


	/* Granularity of c/m/atime in ns (cannot be worse than a second) */

	u32			s_time_gran;

	/* Time limits for c/m/atime in seconds */

	time64_t		   s_time_min;

	time64_t		   s_time_max;

#ifdef CONFIG_FSNOTIFY

	__u32			s_fsnotify_mask;

	struct fsnotify_mark_connector __rcu	*s_fsnotify_marks;

include/linux/time64.h

+2 −0
Original line number Diff line number Diff line
@@ -30,6 +30,8 @@ struct itimerspec64 { 


/* Located here for timespec[64]_valid_strict */

#define TIME64_MAX			((s64)~((u64)1 << 63))

#define TIME64_MIN			(-TIME64_MAX - 1)



#define KTIME_MAX			((s64)~((u64)1 << 63))

#define KTIME_SEC_MAX			(KTIME_MAX / NSEC_PER_SEC)

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