[Y2038] [RFC 4/6] ext4: Initialize timestamps limits

[Deepa Dinamani]

ext4 has different overflow limits for max filesystem
timestamps based on the extra bytes available.

Signed-off-by: Deepa Dinamani 
Cc: "Theodore Ts'o" 
Cc: Andreas Dilger 
Cc: linux-e...@vger.kernel.org
---
 fs/ext4/ext4.h  | 4 
 fs/ext4/super.c | 7 ++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index aff204f..e15c081 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1636,6 +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   Y2038_EXPIRY_TIMESTAMP
+#define EXT4_TIMESTAMP_MIN S32_MIN
+
 /*
  * Feature set definitions
  */
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 72b459d..0519c52 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3672,8 +3672,13 @@ 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)
+   if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
+   sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
+   } else
+   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);
-- 
2.7.4

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[Y2038] [RFC 4/6] ext4: Initialize timestamps limits

[Deepa Dinamani]

ext4 has different overflow limits for max filesystem
timestamps based on the extra bytes available.

Signed-off-by: Deepa Dinamani 
Cc: "Theodore Ts'o" 
Cc: Andreas Dilger 
Cc: linux-e...@vger.kernel.org
---
 fs/ext4/ext4.h  | 4 
 fs/ext4/super.c | 7 ++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 6789379..fca339a 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1635,6 +1635,10 @@ 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   Y2038_EXPIRY_TIMESTAMP
+#define EXT4_TIMESTAMP_MIN S32_MIN
+
 /*
  * Feature set definitions
  */
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ab00bff..ebd039d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3633,8 +3633,13 @@ 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)
+   if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
+   sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
+   } else
+   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);
-- 
2.7.4

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