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Message-Id: <1405424129-4479-1-git-send-email-tytso@mit.edu>
Date: Tue, 15 Jul 2014 07:35:29 -0400
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: gang.chen.5i5j@...il.com, Theodore Ts'o <tytso@....edu>
Subject: [PATCH] ext4: rearrange initialization to fix EXT4FS_DEBUG
The EXT4FS_DEBUG is a *very* developer specific #ifdef designed for
ext4 developers only. (You have to modify fs/ext4/ext4.h to enable
it.)
Rearrange how we initialize data structures to avoid calling
ext4_count_free_clusters() until the multiblock allocator has been
initialized.
This also allows us to only call ext4_count_free_clusters() once, and
simplifies the code somewhat.
(Thanks to Chen Gang <gang.chen.5i5j@...il.com> for pointing out a
!CONFIG_SMP compile breakage in the original patch.)
Signed-off-by: Theodore Ts'o <tytso@....edu>
Reviewed-by: Lukas Czerner <lczerner@...hat.com>
---
fs/ext4/super.c | 88 +++++++++++++++++++++++++--------------------------------
1 file changed, 39 insertions(+), 49 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 6df7bc6..32b43ad 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2142,10 +2142,6 @@ static int ext4_check_descriptors(struct super_block *sb,
}
if (NULL != first_not_zeroed)
*first_not_zeroed = grp;
-
- ext4_free_blocks_count_set(sbi->s_es,
- EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
- sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
return 1;
}
@@ -3883,13 +3879,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
goto failed_mount2;
}
- if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
- if (!ext4_fill_flex_info(sb)) {
- ext4_msg(sb, KERN_ERR,
- "unable to initialize "
- "flex_bg meta info!");
- goto failed_mount2;
- }
sbi->s_gdb_count = db_count;
get_random_bytes(&sbi->s_next_generation, sizeof(u32));
@@ -3902,23 +3891,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
/* Register extent status tree shrinker */
ext4_es_register_shrinker(sbi);
- err = percpu_counter_init(&sbi->s_freeclusters_counter,
- ext4_count_free_clusters(sb));
- if (!err) {
- err = percpu_counter_init(&sbi->s_freeinodes_counter,
- ext4_count_free_inodes(sb));
- }
- if (!err) {
- err = percpu_counter_init(&sbi->s_dirs_counter,
- ext4_count_dirs(sb));
- }
- if (!err) {
- err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
- }
- if (!err) {
- err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
- }
- if (err) {
+ if ((err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0)) != 0) {
ext4_msg(sb, KERN_ERR, "insufficient memory");
goto failed_mount3;
}
@@ -4022,18 +3995,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
- /*
- * The journal may have updated the bg summary counts, so we
- * need to update the global counters.
- */
- percpu_counter_set(&sbi->s_freeclusters_counter,
- ext4_count_free_clusters(sb));
- percpu_counter_set(&sbi->s_freeinodes_counter,
- ext4_count_free_inodes(sb));
- percpu_counter_set(&sbi->s_dirs_counter,
- ext4_count_dirs(sb));
- percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
-
no_journal:
if (ext4_mballoc_ready) {
sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
@@ -4141,6 +4102,33 @@ no_journal:
goto failed_mount5;
}
+ block = ext4_count_free_clusters(sb);
+ ext4_free_blocks_count_set(sbi->s_es,
+ EXT4_C2B(sbi, block));
+ err = percpu_counter_init(&sbi->s_freeclusters_counter, block);
+ if (!err) {
+ unsigned long freei = ext4_count_free_inodes(sb);
+ sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
+ err = percpu_counter_init(&sbi->s_freeinodes_counter, freei);
+ }
+ if (!err)
+ err = percpu_counter_init(&sbi->s_dirs_counter,
+ ext4_count_dirs(sb));
+ if (!err)
+ err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
+ if (err) {
+ ext4_msg(sb, KERN_ERR, "insufficient memory");
+ goto failed_mount6;
+ }
+
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
+ if (!ext4_fill_flex_info(sb)) {
+ ext4_msg(sb, KERN_ERR,
+ "unable to initialize "
+ "flex_bg meta info!");
+ goto failed_mount6;
+ }
+
err = ext4_register_li_request(sb, first_not_zeroed);
if (err)
goto failed_mount6;
@@ -4215,6 +4203,12 @@ failed_mount7:
ext4_unregister_li_request(sb);
failed_mount6:
ext4_mb_release(sb);
+ if (sbi->s_flex_groups)
+ ext4_kvfree(sbi->s_flex_groups);
+ percpu_counter_destroy(&sbi->s_freeclusters_counter);
+ percpu_counter_destroy(&sbi->s_freeinodes_counter);
+ percpu_counter_destroy(&sbi->s_dirs_counter);
+ percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
failed_mount5:
ext4_ext_release(sb);
ext4_release_system_zone(sb);
@@ -4233,12 +4227,6 @@ failed_mount_wq:
failed_mount3:
ext4_es_unregister_shrinker(sbi);
del_timer_sync(&sbi->s_err_report);
- if (sbi->s_flex_groups)
- ext4_kvfree(sbi->s_flex_groups);
- percpu_counter_destroy(&sbi->s_freeclusters_counter);
- percpu_counter_destroy(&sbi->s_freeinodes_counter);
- percpu_counter_destroy(&sbi->s_dirs_counter);
- percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
percpu_counter_destroy(&sbi->s_extent_cache_cnt);
if (sbi->s_mmp_tsk)
kthread_stop(sbi->s_mmp_tsk);
@@ -4556,11 +4544,13 @@ static int ext4_commit_super(struct super_block *sb, int sync)
else
es->s_kbytes_written =
cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
- ext4_free_blocks_count_set(es,
+ if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
+ ext4_free_blocks_count_set(es,
EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
&EXT4_SB(sb)->s_freeclusters_counter)));
- es->s_free_inodes_count =
- cpu_to_le32(percpu_counter_sum_positive(
+ if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
+ es->s_free_inodes_count =
+ cpu_to_le32(percpu_counter_sum_positive(
&EXT4_SB(sb)->s_freeinodes_counter));
BUFFER_TRACE(sbh, "marking dirty");
ext4_superblock_csum_set(sb);
--
2.0.0
--
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