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authorAndreas Dilger <adilger@dilger.ca>2019-02-14 17:52:18 -0500
committerTheodore Ts'o <tytso@mit.edu>2019-02-14 17:52:18 -0500
commitc9e716eb9b3455a83ed7c5f5a81256a3da779a95 (patch)
tree77d6ae90a17991f610b74d6a45b5557950c6a1f4
parenta58ca992661a4bc6a1dfa60e9d6f606e97784149 (diff)
ext4: don't update s_rev_level if not required
Don't update the superblock s_rev_level during mount if it isn't actually necessary, only if superblock features are being set by the kernel. This was originally added for ext3 since it always set the INCOMPAT_RECOVER and HAS_JOURNAL features during mount, but this is not needed since no journal mode was added to ext4. That will allow Geert to mount his 20-year-old ext2 rev 0.0 m68k filesystem, as a testament of the backward compatibility of ext4. Fixes: 0390131ba84f ("ext4: Allow ext4 to run without a journal") Signed-off-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
-rw-r--r--fs/ext4/ext4.h6
-rw-r--r--fs/ext4/inode.c1
-rw-r--r--fs/ext4/super.c1
3 files changed, 5 insertions, 3 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 508a37ec9271..b8fde74ff76d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1665,6 +1665,8 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
+extern void ext4_update_dynamic_rev(struct super_block *sb);
+
#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
static inline bool ext4_has_feature_##name(struct super_block *sb) \
{ \
@@ -1673,6 +1675,7 @@ static inline bool ext4_has_feature_##name(struct super_block *sb) \
} \
static inline void ext4_set_feature_##name(struct super_block *sb) \
{ \
+ ext4_update_dynamic_rev(sb); \
EXT4_SB(sb)->s_es->s_feature_compat |= \
cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
} \
@@ -1690,6 +1693,7 @@ static inline bool ext4_has_feature_##name(struct super_block *sb) \
} \
static inline void ext4_set_feature_##name(struct super_block *sb) \
{ \
+ ext4_update_dynamic_rev(sb); \
EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
} \
@@ -1707,6 +1711,7 @@ static inline bool ext4_has_feature_##name(struct super_block *sb) \
} \
static inline void ext4_set_feature_##name(struct super_block *sb) \
{ \
+ ext4_update_dynamic_rev(sb); \
EXT4_SB(sb)->s_es->s_feature_incompat |= \
cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
} \
@@ -2675,7 +2680,6 @@ do { \
#endif
-extern void ext4_update_dynamic_rev(struct super_block *sb);
extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
__u32 compat);
extern int ext4_update_rocompat_feature(handle_t *handle,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9c3402ec85bc..2b6eefbc3b34 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5345,7 +5345,6 @@ static int ext4_do_update_inode(handle_t *handle,
err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
if (err)
goto out_brelse;
- ext4_update_dynamic_rev(sb);
ext4_set_feature_large_file(sb);
ext4_handle_sync(handle);
err = ext4_handle_dirty_super(handle, sb);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index fb12d3c17c1b..6e4cac646345 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2249,7 +2249,6 @@ static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
le16_add_cpu(&es->s_mnt_count, 1);
ext4_update_tstamp(es, s_mtime);
- ext4_update_dynamic_rev(sb);
if (sbi->s_journal)
ext4_set_feature_journal_needs_recovery(sb);