@@ -247,6 +247,8 @@ 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;
@@ -1337,6 +1337,9 @@ 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;
/*
* The next field is for VFS *only*. No filesystems have any business
@@ -38,6 +38,8 @@ 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)
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. Note that the time ranges are saved in type time64_t rather than time_t. This is required because if we save ranges in time_t then we would not be able to save timestamp ranges for files that support timestamps beyond y2038. Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> --- fs/super.c | 2 ++ include/linux/fs.h | 3 +++ include/linux/time64.h | 2 ++ 3 files changed, 7 insertions(+)