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author | Deepa Dinamani <deepa.kernel@gmail.com> | 2018-01-22 05:04:24 +0300 |
---|---|---|
committer | Deepa Dinamani <deepa.kernel@gmail.com> | 2019-08-30 17:27:18 +0300 |
commit | 4881c4971df04107b37c29bb6c719ec29ceb6571 (patch) | |
tree | 3704bb4fff9c349f6e395dac4cad4d370179f935 | |
parent | d5c6e2d5188d9677462f3827034d060372a13b6e (diff) | |
download | linux-4881c4971df04107b37c29bb6c719ec29ceb6571.tar.xz |
ext4: Initialize timestamps limits
ext4 has different overflow limits for max filesystem
timestamps based on the extra bytes available.
The timestamp limits are calculated according to the
encoding table in
a4dad1ae24f85i(ext4: Fix handling of extended tv_sec):
* extra msb of adjust for signed
* epoch 32-bit 32-bit tv_sec to
* bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
* 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
* 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
* 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
* 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
* 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
* 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
* 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
* 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
Note that the time limits are not correct for deletion times.
Added a warn when an inode cannot be extended to incorporate an
extended timestamp.
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Acked-by: Jeff Layton <jlayton@kernel.org>
Cc: tytso@mit.edu
Cc: adilger.kernel@dilger.ca
Cc: linux-ext4@vger.kernel.org
-rw-r--r-- | fs/ext4/ext4.h | 10 | ||||
-rw-r--r-- | fs/ext4/super.c | 17 |
2 files changed, 24 insertions, 3 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index bf660aa7a9e0..9e3ae3be3de9 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -828,11 +828,15 @@ static inline void ext4_decode_extra_time(struct timespec64 *time, #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ do { \ - (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ + (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ (raw_inode)->xtime ## _extra = \ ext4_encode_extra_time(&(inode)->xtime); \ } \ + else {\ + (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ + ext4_warning_inode(inode, "inode does not support timestamps beyond 2038"); \ + } \ } while (0) #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ @@ -1632,6 +1636,10 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) #define EXT4_GOOD_OLD_INODE_SIZE 128 +#define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) +#define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX +#define EXT4_TIMESTAMP_MIN S32_MIN + /* * Feature set definitions */ diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 4079605d437a..3ea2d60f33aa 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4035,8 +4035,21 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) sbi->s_inode_size); goto failed_mount; } - if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) - sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); + /* + * i_atime_extra is the last extra field available for [acm]times in + * struct ext4_inode. Checking for that field should suffice to ensure + * we have extra space for all three. + */ + if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) + + sizeof(((struct ext4_inode *)0)->i_atime_extra)) { + sb->s_time_gran = 1; + sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX; + } else { + sb->s_time_gran = NSEC_PER_SEC; + sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX; + } + + sb->s_time_min = EXT4_TIMESTAMP_MIN; } sbi->s_desc_size = le16_to_cpu(es->s_desc_size); |