From: Christoph Hellwig Date: Mon, 11 May 2009 21:35:03 +0000 (+0200) Subject: ->write_super lock_super pushdown X-Git-Tag: v2.6.31-rc1~375^2~40 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ebc1ac164560a241d9bf1b7519062910c3f90a01;p=profile%2Fcommon%2Fkernel-common.git ->write_super lock_super pushdown Push down lock_super into ->write_super instances and remove it from the caller. Following filesystem don't need ->s_lock in ->write_super and are skipped: * bfs, nilfs2 - no other uses of s_lock and have internal locks in ->write_super * ext2 - uses BKL in ext2_write_super and has internal calls without s_lock * reiserfs - no other uses of s_lock as has reiserfs_write_lock (BKL) in ->write_super * xfs - no other uses of s_lock and uses internal lock (buffer lock on superblock buffer) to serialize ->write_super. Also xfs_fs_write_super is superflous and will go away in the next merge window Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- diff --git a/fs/affs/super.c b/fs/affs/super.c index d738646..280d361 100644 --- a/fs/affs/super.c +++ b/fs/affs/super.c @@ -54,6 +54,7 @@ affs_write_super(struct super_block *sb) int clean = 2; struct affs_sb_info *sbi = AFFS_SB(sb); + lock_super(sb); if (!(sb->s_flags & MS_RDONLY)) { // if (sbi->s_bitmap[i].bm_bh) { // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) { @@ -66,6 +67,7 @@ affs_write_super(struct super_block *sb) sb->s_dirt = !clean; /* redo until bitmap synced */ } else sb->s_dirt = 0; + unlock_super(sb); pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean); } diff --git a/fs/exofs/super.c b/fs/exofs/super.c index cd1f8b1..49e16af 100644 --- a/fs/exofs/super.c +++ b/fs/exofs/super.c @@ -214,6 +214,7 @@ static void exofs_write_super(struct super_block *sb) return; } + lock_super(sb); lock_kernel(); sbi = sb->s_fs_info; fscb->s_nextid = cpu_to_le64(sbi->s_nextid); @@ -246,6 +247,7 @@ out: if (or) osd_end_request(or); unlock_kernel(); + unlock_super(sb); kfree(fscb); } diff --git a/fs/ext4/super.c b/fs/ext4/super.c index a9c6834..c17200a 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -579,7 +579,7 @@ static void ext4_put_super(struct super_block *sb) lock_super(sb); lock_kernel(); if (sb->s_dirt) - ext4_write_super(sb); + ext4_commit_super(sb, 1); ext4_release_system_zone(sb); ext4_mb_release(sb); @@ -3336,7 +3336,9 @@ int ext4_force_commit(struct super_block *sb) static void ext4_write_super(struct super_block *sb) { + lock_super(sb); ext4_commit_super(sb, 1); + unlock_super(sb); } static int ext4_sync_fs(struct super_block *sb, int wait) diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 2b88c93..2292cbf 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -441,10 +441,12 @@ static void fat_clear_inode(struct inode *inode) static void fat_write_super(struct super_block *sb) { + lock_super(sb); sb->s_dirt = 0; if (!(sb->s_flags & MS_RDONLY)) fat_clusters_flush(sb); + unlock_super(sb); } static void fat_put_super(struct super_block *sb) diff --git a/fs/hfs/super.c b/fs/hfs/super.c index 9f5eaa0..3aac417 100644 --- a/fs/hfs/super.c +++ b/fs/hfs/super.c @@ -49,11 +49,13 @@ MODULE_LICENSE("GPL"); */ static void hfs_write_super(struct super_block *sb) { + lock_super(sb); sb->s_dirt = 0; - if (sb->s_flags & MS_RDONLY) - return; + /* sync everything to the buffers */ - hfs_mdb_commit(sb); + if (!(sb->s_flags & MS_RDONLY)) + hfs_mdb_commit(sb); + unlock_super(sb); } /* diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c index 9b292dc..1aab8aa 100644 --- a/fs/hfsplus/super.c +++ b/fs/hfsplus/super.c @@ -157,10 +157,12 @@ static void hfsplus_write_super(struct super_block *sb) struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; dprint(DBG_SUPER, "hfsplus_write_super\n"); + + lock_super(sb); sb->s_dirt = 0; if (sb->s_flags & MS_RDONLY) /* warn? */ - return; + goto out; vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks); vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc); @@ -192,6 +194,8 @@ static void hfsplus_write_super(struct super_block *sb) } HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP; } + out: + unlock_super(sb); } static void hfsplus_put_super(struct super_block *sb) diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c index a80a50e..f7bfd3a 100644 --- a/fs/jffs2/super.c +++ b/fs/jffs2/super.c @@ -56,15 +56,18 @@ static void jffs2_i_init_once(void *foo) static void jffs2_write_super(struct super_block *sb) { struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); + + lock_super(sb); sb->s_dirt = 0; - if (sb->s_flags & MS_RDONLY) - return; + if (!(sb->s_flags & MS_RDONLY)) { + D1(printk(KERN_DEBUG "jffs2_write_super()\n")); + jffs2_garbage_collect_trigger(c); + jffs2_erase_pending_blocks(c, 0); + jffs2_flush_wbuf_gc(c, 0); + } - D1(printk(KERN_DEBUG "jffs2_write_super()\n")); - jffs2_garbage_collect_trigger(c); - jffs2_erase_pending_blocks(c, 0); - jffs2_flush_wbuf_gc(c, 0); + unlock_super(sb); } static int jffs2_sync_fs(struct super_block *sb, int wait) diff --git a/fs/super.c b/fs/super.c index a64f362..1905f4a 100644 --- a/fs/super.c +++ b/fs/super.c @@ -420,10 +420,8 @@ restart: spin_unlock(&sb_lock); down_read(&sb->s_umount); - lock_super(sb); if (sb->s_root && sb->s_dirt) sb->s_op->write_super(sb); - unlock_super(sb); up_read(&sb->s_umount); spin_lock(&sb_lock); diff --git a/fs/sync.c b/fs/sync.c index 89c37f7..e9d56f6 100644 --- a/fs/sync.c +++ b/fs/sync.c @@ -33,10 +33,8 @@ static int __sync_filesystem(struct super_block *sb, int wait) else sync_quota_sb(sb, -1); sync_inodes_sb(sb, wait); - lock_super(sb); if (sb->s_dirt && sb->s_op->write_super) sb->s_op->write_super(sb); - unlock_super(sb); if (sb->s_op->sync_fs) sb->s_op->sync_fs(sb, wait); return __sync_blockdev(sb->s_bdev, wait); @@ -164,10 +162,8 @@ int file_fsync(struct file *filp, struct dentry *dentry, int datasync) /* sync the superblock to buffers */ sb = inode->i_sb; - lock_super(sb); if (sb->s_dirt && sb->s_op->write_super) sb->s_op->write_super(sb); - unlock_super(sb); /* .. finally sync the buffers to disk */ err = sync_blockdev(sb->s_bdev); diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c index e0a39f1..a3f45fc 100644 --- a/fs/sysv/inode.c +++ b/fs/sysv/inode.c @@ -37,6 +37,7 @@ static void sysv_write_super(struct super_block *sb) struct sysv_sb_info *sbi = SYSV_SB(sb); unsigned long time = get_seconds(), old_time; + lock_super(sb); lock_kernel(); if (sb->s_flags & MS_RDONLY) goto clean; @@ -56,6 +57,7 @@ static void sysv_write_super(struct super_block *sb) clean: sb->s_dirt = 0; unlock_kernel(); + unlock_super(sb); } static int sysv_remount(struct super_block *sb, int *flags, char *data) diff --git a/fs/ufs/super.c b/fs/ufs/super.c index a5ecabf..c97210e 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -1131,6 +1131,7 @@ static void ufs_write_super(struct super_block *sb) struct ufs_super_block_third * usb3; unsigned flags; + lock_super(sb); lock_kernel(); UFSD("ENTER\n"); flags = UFS_SB(sb)->s_flags; @@ -1150,6 +1151,7 @@ static void ufs_write_super(struct super_block *sb) sb->s_dirt = 0; UFSD("EXIT\n"); unlock_kernel(); + unlock_super(sb); } static void ufs_put_super(struct super_block *sb)