From 618f06362ae3f60f95d7b0e666de25ee6ae35679 Mon Sep 17 00:00:00 2001 From: Kirill Korotaev Date: Thu, 23 Jun 2005 00:09:54 -0700 Subject: [PATCH] O(1) sb list traversing on syncs This patch removes O(n^2) super block loops in sync_inodes(), sync_filesystems() etc. in favour of using __put_super_and_need_restart() which I introduced earlier. We faced a noticably long freezes on sb syncing when there are thousands of super blocks in the system. Signed-Off-By: Kirill Korotaev Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/fs-writeback.c | 64 ++++++++++++++++++------------------------ fs/quota.c | 60 ++++++++++++++++------------------------ fs/super.c | 83 ++++++++++++++++++++++++++++++------------------------- 3 files changed, 96 insertions(+), 111 deletions(-) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 8e050fa58218..e94ab398b717 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -485,32 +485,6 @@ static void set_sb_syncing(int val) spin_unlock(&sb_lock); } -/* - * Find a superblock with inodes that need to be synced - */ -static struct super_block *get_super_to_sync(void) -{ - struct super_block *sb; -restart: - spin_lock(&sb_lock); - sb = sb_entry(super_blocks.prev); - for (; sb != sb_entry(&super_blocks); sb = sb_entry(sb->s_list.prev)) { - if (sb->s_syncing) - continue; - sb->s_syncing = 1; - sb->s_count++; - spin_unlock(&sb_lock); - down_read(&sb->s_umount); - if (!sb->s_root) { - drop_super(sb); - goto restart; - } - return sb; - } - spin_unlock(&sb_lock); - return NULL; -} - /** * sync_inodes - writes all inodes to disk * @wait: wait for completion @@ -530,23 +504,39 @@ restart: * outstanding dirty inodes, the writeback goes block-at-a-time within the * filesystem's write_inode(). This is extremely slow. */ -void sync_inodes(int wait) +static void __sync_inodes(int wait) { struct super_block *sb; - set_sb_syncing(0); - while ((sb = get_super_to_sync()) != NULL) { - sync_inodes_sb(sb, 0); - sync_blockdev(sb->s_bdev); - drop_super(sb); + spin_lock(&sb_lock); +restart: + list_for_each_entry(sb, &super_blocks, s_list) { + if (sb->s_syncing) + continue; + sb->s_syncing = 1; + sb->s_count++; + spin_unlock(&sb_lock); + down_read(&sb->s_umount); + if (sb->s_root) { + sync_inodes_sb(sb, wait); + sync_blockdev(sb->s_bdev); + } + up_read(&sb->s_umount); + spin_lock(&sb_lock); + if (__put_super_and_need_restart(sb)) + goto restart; } + spin_unlock(&sb_lock); +} + +void sync_inodes(int wait) +{ + set_sb_syncing(0); + __sync_inodes(0); + if (wait) { set_sb_syncing(0); - while ((sb = get_super_to_sync()) != NULL) { - sync_inodes_sb(sb, 1); - sync_blockdev(sb->s_bdev); - drop_super(sb); - } + __sync_inodes(1); } } diff --git a/fs/quota.c b/fs/quota.c index 3f0333a51a23..f5d1cff55196 100644 --- a/fs/quota.c +++ b/fs/quota.c @@ -149,36 +149,6 @@ static int check_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t return error; } -static struct super_block *get_super_to_sync(int type) -{ - struct list_head *head; - int cnt, dirty; - -restart: - spin_lock(&sb_lock); - list_for_each(head, &super_blocks) { - struct super_block *sb = list_entry(head, struct super_block, s_list); - - /* This test just improves performance so it needn't be reliable... */ - for (cnt = 0, dirty = 0; cnt < MAXQUOTAS; cnt++) - if ((type == cnt || type == -1) && sb_has_quota_enabled(sb, cnt) - && info_any_dirty(&sb_dqopt(sb)->info[cnt])) - dirty = 1; - if (!dirty) - continue; - sb->s_count++; - spin_unlock(&sb_lock); - down_read(&sb->s_umount); - if (!sb->s_root) { - drop_super(sb); - goto restart; - } - return sb; - } - spin_unlock(&sb_lock); - return NULL; -} - static void quota_sync_sb(struct super_block *sb, int type) { int cnt; @@ -219,17 +189,35 @@ static void quota_sync_sb(struct super_block *sb, int type) void sync_dquots(struct super_block *sb, int type) { + int cnt, dirty; + if (sb) { if (sb->s_qcop->quota_sync) quota_sync_sb(sb, type); + return; } - else { - while ((sb = get_super_to_sync(type)) != NULL) { - if (sb->s_qcop->quota_sync) - quota_sync_sb(sb, type); - drop_super(sb); - } + + spin_lock(&sb_lock); +restart: + list_for_each_entry(sb, &super_blocks, s_list) { + /* This test just improves performance so it needn't be reliable... */ + for (cnt = 0, dirty = 0; cnt < MAXQUOTAS; cnt++) + if ((type == cnt || type == -1) && sb_has_quota_enabled(sb, cnt) + && info_any_dirty(&sb_dqopt(sb)->info[cnt])) + dirty = 1; + if (!dirty) + continue; + sb->s_count++; + spin_unlock(&sb_lock); + down_read(&sb->s_umount); + if (sb->s_root && sb->s_qcop->quota_sync) + quota_sync_sb(sb, type); + up_read(&sb->s_umount); + spin_lock(&sb_lock); + if (__put_super_and_need_restart(sb)) + goto restart; } + spin_unlock(&sb_lock); } /* Copy parameters and call proper function */ diff --git a/fs/super.c b/fs/super.c index 573bcc81bb82..25bc1ec6bc5d 100644 --- a/fs/super.c +++ b/fs/super.c @@ -341,20 +341,22 @@ static inline void write_super(struct super_block *sb) */ void sync_supers(void) { - struct super_block * sb; -restart: + struct super_block *sb; + spin_lock(&sb_lock); - sb = sb_entry(super_blocks.next); - while (sb != sb_entry(&super_blocks)) +restart: + list_for_each_entry(sb, &super_blocks, s_list) { if (sb->s_dirt) { sb->s_count++; spin_unlock(&sb_lock); down_read(&sb->s_umount); write_super(sb); - drop_super(sb); - goto restart; - } else - sb = sb_entry(sb->s_list.next); + up_read(&sb->s_umount); + spin_lock(&sb_lock); + if (__put_super_and_need_restart(sb)) + goto restart; + } + } spin_unlock(&sb_lock); } @@ -381,20 +383,16 @@ void sync_filesystems(int wait) down(&mutex); /* Could be down_interruptible */ spin_lock(&sb_lock); - for (sb = sb_entry(super_blocks.next); sb != sb_entry(&super_blocks); - sb = sb_entry(sb->s_list.next)) { + list_for_each_entry(sb, &super_blocks, s_list) { if (!sb->s_op->sync_fs) continue; if (sb->s_flags & MS_RDONLY) continue; sb->s_need_sync_fs = 1; } - spin_unlock(&sb_lock); restart: - spin_lock(&sb_lock); - for (sb = sb_entry(super_blocks.next); sb != sb_entry(&super_blocks); - sb = sb_entry(sb->s_list.next)) { + list_for_each_entry(sb, &super_blocks, s_list) { if (!sb->s_need_sync_fs) continue; sb->s_need_sync_fs = 0; @@ -405,8 +403,11 @@ restart: down_read(&sb->s_umount); if (sb->s_root && (wait || sb->s_dirt)) sb->s_op->sync_fs(sb, wait); - drop_super(sb); - goto restart; + up_read(&sb->s_umount); + /* restart only when sb is no longer on the list */ + spin_lock(&sb_lock); + if (__put_super_and_need_restart(sb)) + goto restart; } spin_unlock(&sb_lock); up(&mutex); @@ -422,21 +423,25 @@ restart: struct super_block * get_super(struct block_device *bdev) { - struct list_head *p; + struct super_block *sb; + if (!bdev) return NULL; -rescan: + spin_lock(&sb_lock); - list_for_each(p, &super_blocks) { - struct super_block *s = sb_entry(p); - if (s->s_bdev == bdev) { - s->s_count++; +rescan: + list_for_each_entry(sb, &super_blocks, s_list) { + if (sb->s_bdev == bdev) { + sb->s_count++; spin_unlock(&sb_lock); - down_read(&s->s_umount); - if (s->s_root) - return s; - drop_super(s); - goto rescan; + down_read(&sb->s_umount); + if (sb->s_root) + return sb; + up_read(&sb->s_umount); + /* restart only when sb is no longer on the list */ + spin_lock(&sb_lock); + if (__put_super_and_need_restart(sb)) + goto rescan; } } spin_unlock(&sb_lock); @@ -447,20 +452,22 @@ EXPORT_SYMBOL(get_super); struct super_block * user_get_super(dev_t dev) { - struct list_head *p; + struct super_block *sb; -rescan: spin_lock(&sb_lock); - list_for_each(p, &super_blocks) { - struct super_block *s = sb_entry(p); - if (s->s_dev == dev) { - s->s_count++; +rescan: + list_for_each_entry(sb, &super_blocks, s_list) { + if (sb->s_dev == dev) { + sb->s_count++; spin_unlock(&sb_lock); - down_read(&s->s_umount); - if (s->s_root) - return s; - drop_super(s); - goto rescan; + down_read(&sb->s_umount); + if (sb->s_root) + return sb; + up_read(&sb->s_umount); + /* restart only when sb is no longer on the list */ + spin_lock(&sb_lock); + if (__put_super_and_need_restart(sb)) + goto rescan; } } spin_unlock(&sb_lock); 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