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authorDeepa Dinamani <deepa.kernel@gmail.com>2015-12-21 10:51:01 +1100
committerNeilBrown <neilb@suse.com>2016-01-06 11:39:53 +1100
commit9ebc6ef188a0656f3620835f9be7fe22c1644c1c (patch)
tree08ac1b7cc613d6afef042e97efe281956dafe482 /drivers/md
parent3312c951efaba55080958974047414576b9e5d63 (diff)
downloadlinux-9ebc6ef188a0656f3620835f9be7fe22c1644c1c.tar.bz2
drivers: md: use ktime_get_real_seconds()
get_seconds() API is not y2038 safe on 32 bit systems and the API is deprecated. Replace it with calls to ktime_get_real_seconds() API instead. Change mddev structure types to time64_t accordingly. 32 bit signed timestamps will overflow in the year 2038. Change the user interface mdu_array_info_s structure timestamps: ctime and utime values used in ioctls GET_ARRAY_INFO and SET_ARRAY_INFO to unsigned int. This will extend the field to last until the year 2106. The long term plan is to get rid of ctime and utime values in this structure as this information can be read from the on-disk meta data directly. Clamp the tim64_t timestamps to positive values with a max of U32_MAX when returning from GET_ARRAY_INFO ioctl to accommodate above changes in the data type of timestamps to unsigned int. v0.90 on disk meta data uses u32 for maintaining time stamps. So this will also last until year 2106. Assumption is that the usage of v0.90 will be deprecated by year 2106. Timestamp fields in the on disk meta data for v1.0 version already use 64 bit data types. Remove the truncation of the bits while writing to or reading from these from the disk. Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/md.c18
-rw-r--r--drivers/md/md.h2
2 files changed, 10 insertions, 10 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 3d70d0d11b95..d0f0621bf9b0 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1200,13 +1200,13 @@ static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
memcpy(&sb->set_uuid3, mddev->uuid+12,4);
- sb->ctime = mddev->ctime;
+ sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
sb->level = mddev->level;
sb->size = mddev->dev_sectors / 2;
sb->raid_disks = mddev->raid_disks;
sb->md_minor = mddev->md_minor;
sb->not_persistent = 0;
- sb->utime = mddev->utime;
+ sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
sb->state = 0;
sb->events_hi = (mddev->events>>32);
sb->events_lo = (u32)mddev->events;
@@ -1547,8 +1547,8 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->patch_version = 0;
mddev->external = 0;
mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
- mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
- mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
+ mddev->ctime = le64_to_cpu(sb->ctime);
+ mddev->utime = le64_to_cpu(sb->utime);
mddev->level = le32_to_cpu(sb->level);
mddev->clevel[0] = 0;
mddev->layout = le32_to_cpu(sb->layout);
@@ -2336,7 +2336,7 @@ repeat:
spin_lock(&mddev->lock);
- mddev->utime = get_seconds();
+ mddev->utime = ktime_get_real_seconds();
if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
force_change = 1;
@@ -5843,7 +5843,7 @@ static int get_array_info(struct mddev *mddev, void __user *arg)
info.major_version = mddev->major_version;
info.minor_version = mddev->minor_version;
info.patch_version = MD_PATCHLEVEL_VERSION;
- info.ctime = mddev->ctime;
+ info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
info.level = mddev->level;
info.size = mddev->dev_sectors / 2;
if (info.size != mddev->dev_sectors / 2) /* overflow */
@@ -5853,7 +5853,7 @@ static int get_array_info(struct mddev *mddev, void __user *arg)
info.md_minor = mddev->md_minor;
info.not_persistent= !mddev->persistent;
- info.utime = mddev->utime;
+ info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
info.state = 0;
if (mddev->in_sync)
info.state = (1<<MD_SB_CLEAN);
@@ -6353,13 +6353,13 @@ static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
/* ensure mddev_put doesn't delete this now that there
* is some minimal configuration.
*/
- mddev->ctime = get_seconds();
+ mddev->ctime = ktime_get_real_seconds();
return 0;
}
mddev->major_version = MD_MAJOR_VERSION;
mddev->minor_version = MD_MINOR_VERSION;
mddev->patch_version = MD_PATCHLEVEL_VERSION;
- mddev->ctime = get_seconds();
+ mddev->ctime = ktime_get_real_seconds();
mddev->level = info->level;
mddev->clevel[0] = 0;
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 8817e623258a..e16a17c37418 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -264,7 +264,7 @@ struct mddev {
* managed externally */
char metadata_type[17]; /* externally set*/
int chunk_sectors;
- time_t ctime, utime;
+ time64_t ctime, utime;
int level, layout;
char clevel[16];
int raid_disks;