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author | Miao Xie <miaox@cn.fujitsu.com> | 2013-01-29 10:11:59 +0000 |
---|---|---|
committer | Josef Bacik <jbacik@fusionio.com> | 2013-02-20 12:59:06 -0500 |
commit | df0af1a57f72c74d53a9377c60ff20095afab97d (patch) | |
tree | 588048ea16f8564a2eb449c0e9b7ba22c49eebc6 /fs | |
parent | 963d678b0f7649300e3a67f2513ca9d830c6e303 (diff) | |
download | linux-3.10-df0af1a57f72c74d53a9377c60ff20095afab97d.tar.gz linux-3.10-df0af1a57f72c74d53a9377c60ff20095afab97d.tar.bz2 linux-3.10-df0af1a57f72c74d53a9377c60ff20095afab97d.zip |
Btrfs: use the inode own lock to protect its delalloc_bytes
We need not use a global lock to protect the delalloc_bytes of the
inode, just use its own lock. In this way, we can reduce the lock
contention and ->delalloc_lock will just protect delalloc inode
list.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/btrfs/btrfs_inode.h | 1 | ||||
-rw-r--r-- | fs/btrfs/disk-io.c | 2 | ||||
-rw-r--r-- | fs/btrfs/inode.c | 47 |
3 files changed, 37 insertions, 13 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h index 2a8c242bc4f..c935a774a9f 100644 --- a/fs/btrfs/btrfs_inode.h +++ b/fs/btrfs/btrfs_inode.h @@ -40,6 +40,7 @@ #define BTRFS_INODE_HAS_ASYNC_EXTENT 6 #define BTRFS_INODE_NEEDS_FULL_SYNC 7 #define BTRFS_INODE_COPY_EVERYTHING 8 +#define BTRFS_INODE_IN_DELALLOC_LIST 9 /* in memory btrfs inode */ struct btrfs_inode { diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 2c9498aefe8..11f6dbcb119 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3690,6 +3690,8 @@ static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root) delalloc_inodes); list_del_init(&btrfs_inode->delalloc_inodes); + clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &btrfs_inode->runtime_flags); btrfs_invalidate_inodes(btrfs_inode->root); } diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 24c0b7805fe..82c7c66f852 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1514,15 +1514,22 @@ static void btrfs_set_bit_hook(struct inode *inode, spin_unlock(&BTRFS_I(inode)->lock); } - spin_lock(&root->fs_info->delalloc_lock); - BTRFS_I(inode)->delalloc_bytes += len; __percpu_counter_add(&root->fs_info->delalloc_bytes, len, root->fs_info->delalloc_batch); - if (do_list && list_empty(&BTRFS_I(inode)->delalloc_inodes)) { - list_add_tail(&BTRFS_I(inode)->delalloc_inodes, - &root->fs_info->delalloc_inodes); + spin_lock(&BTRFS_I(inode)->lock); + BTRFS_I(inode)->delalloc_bytes += len; + if (do_list && !test_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &BTRFS_I(inode)->runtime_flags)) { + spin_lock(&root->fs_info->delalloc_lock); + if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) { + list_add_tail(&BTRFS_I(inode)->delalloc_inodes, + &root->fs_info->delalloc_inodes); + set_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &BTRFS_I(inode)->runtime_flags); + } + spin_unlock(&root->fs_info->delalloc_lock); } - spin_unlock(&root->fs_info->delalloc_lock); + spin_unlock(&BTRFS_I(inode)->lock); } } @@ -1557,16 +1564,22 @@ static void btrfs_clear_bit_hook(struct inode *inode, && do_list) btrfs_free_reserved_data_space(inode, len); - spin_lock(&root->fs_info->delalloc_lock); __percpu_counter_add(&root->fs_info->delalloc_bytes, -len, root->fs_info->delalloc_batch); + spin_lock(&BTRFS_I(inode)->lock); BTRFS_I(inode)->delalloc_bytes -= len; - if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 && - !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { - list_del_init(&BTRFS_I(inode)->delalloc_inodes); + test_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &BTRFS_I(inode)->runtime_flags)) { + spin_lock(&root->fs_info->delalloc_lock); + if (!list_empty(&BTRFS_I(inode)->delalloc_inodes)) { + list_del_init(&BTRFS_I(inode)->delalloc_inodes); + clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &BTRFS_I(inode)->runtime_flags); + } + spin_unlock(&root->fs_info->delalloc_lock); } - spin_unlock(&root->fs_info->delalloc_lock); + spin_unlock(&BTRFS_I(inode)->lock); } } @@ -7326,14 +7339,19 @@ fail: static int btrfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { + u64 delalloc_bytes; struct inode *inode = dentry->d_inode; u32 blocksize = inode->i_sb->s_blocksize; generic_fillattr(inode, stat); stat->dev = BTRFS_I(inode)->root->anon_dev; stat->blksize = PAGE_CACHE_SIZE; + + spin_lock(&BTRFS_I(inode)->lock); + delalloc_bytes = BTRFS_I(inode)->delalloc_bytes; + spin_unlock(&BTRFS_I(inode)->lock); stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) + - ALIGN(BTRFS_I(inode)->delalloc_bytes, blocksize)) >> 9; + ALIGN(delalloc_bytes, blocksize)) >> 9; return 0; } @@ -7620,8 +7638,11 @@ int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput) list_del_init(&binode->delalloc_inodes); inode = igrab(&binode->vfs_inode); - if (!inode) + if (!inode) { + clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &binode->runtime_flags); continue; + } list_add_tail(&binode->delalloc_inodes, &root->fs_info->delalloc_inodes); |