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authorArnd Bergmann <arnd@arndb.de>2018-07-29 15:51:48 -0400
committerTheodore Ts'o <tytso@mit.edu>2018-07-29 15:51:48 -0400
commit6a0678a79bb3a4e5fc1b680e7afc78727e21aff3 (patch)
treee86f4d3e34620c66c4ed18d890650012d584a87c /fs/ext4/sysfs.c
parentb42d1d6b5b789c41dacbe2bc192c7b359d109d7b (diff)
ext4: super: extend timestamps to 40 bits
The inode timestamps use 34 bits in ext4, but the various timestamps in the superblock are limited to 32 bits. If every user accesses these as 'unsigned', then this is good until year 2106, but it seems better to extend this a bit further in the process of removing the deprecated get_seconds() function. This adds another byte for each timestamp in the superblock, making them long enough to store timestamps beyond what is in the inodes, which seems good enough here (in ocfs2, they are already 64-bit wide, which is appropriate for a new layout). I did not modify e2fsprogs, which obviously needs the same change to actually interpret future timestamps correctly. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/sysfs.c')
-rw-r--r--fs/ext4/sysfs.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index b970a200f20c..e60cc5e89023 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -25,6 +25,8 @@ typedef enum {
attr_reserved_clusters,
attr_inode_readahead,
attr_trigger_test_error,
+ attr_first_error_time,
+ attr_last_error_time,
attr_feature,
attr_pointer_ui,
attr_pointer_atomic,
@@ -182,8 +184,8 @@ EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
-EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
-EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
+EXT4_ATTR(first_error_time, 0444, first_error_time);
+EXT4_ATTR(last_error_time, 0444, last_error_time);
static unsigned int old_bump_val = 128;
EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
@@ -249,6 +251,15 @@ static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
return NULL;
}
+static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
+{
+ return snprintf(buf, PAGE_SIZE, "%lld",
+ ((time64_t)hi << 32) + le32_to_cpu(lo));
+}
+
+#define print_tstamp(buf, es, tstamp) \
+ __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
+
static ssize_t ext4_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
@@ -287,6 +298,10 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
atomic_read((atomic_t *) ptr));
case attr_feature:
return snprintf(buf, PAGE_SIZE, "supported\n");
+ case attr_first_error_time:
+ return print_tstamp(buf, sbi->s_es, s_first_error_time);
+ case attr_last_error_time:
+ return print_tstamp(buf, sbi->s_es, s_last_error_time);
}
return 0;