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author | Dongsheng Yang <yangds.fnst@cn.fujitsu.com> | 2014-12-29 06:23:05 -0500 |
---|---|---|
committer | Chris Mason <clm@fb.com> | 2015-04-13 07:52:48 -0700 |
commit | 237c0e9f1fbfdca7287f3539f1fa73e5063156b5 (patch) | |
tree | 6a5091ad33fc0da2f7bc4086de8f731877dfd754 | |
parent | 31193213f1f9c13f6485007ef1e233b119e46910 (diff) | |
download | op-kernel-dev-237c0e9f1fbfdca7287f3539f1fa73e5063156b5.zip op-kernel-dev-237c0e9f1fbfdca7287f3539f1fa73e5063156b5.tar.gz |
Btrfs: qgroup, Account data space in more proper timings.
Currenly, in data writing, ->reserved is accounted in
fill_delalloc(), but ->may_use is released in clear_bit_hook()
which is called by btrfs_finish_ordered_io(). That's too late,
that said, between fill_delalloc() and btrfs_finish_ordered_io(),
the data is doublely accounted by qgroup. It will cause some
unexpected -EDQUOT.
Example:
# btrfs quota enable /root/btrfs-auto-test/
# btrfs subvolume create /root/btrfs-auto-test//sub
Create subvolume '/root/btrfs-auto-test/sub'
# btrfs qgroup limit 1G /root/btrfs-auto-test//sub
dd if=/dev/zero of=/root/btrfs-auto-test//sub/file bs=1024 count=1500000
dd: error writing '/root/btrfs-auto-test//sub/file': Disk quota exceeded
681353+0 records in
681352+0 records out
697704448 bytes (698 MB) copied, 8.15563 s, 85.5 MB/s
It's (698 MB) when we got an -EDQUOT, but we limit it by 1G.
This patch move the btrfs_qgroup_reserve/free() for data from
btrfs_delalloc_reserve/release_metadata() to btrfs_check_data_free_space()
and btrfs_free_reserved_data_space(). Then the accounter in qgroup
will be updated at the same time with the accounter in space_info updated.
In this way, the unexpected -EDQUOT will be killed.
Reported-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
-rw-r--r-- | fs/btrfs/extent-tree.c | 16 | ||||
-rw-r--r-- | fs/btrfs/file.c | 10 |
2 files changed, 10 insertions, 16 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 3113e0b..4d37746 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3969,12 +3969,16 @@ commit_trans: data_sinfo->flags, bytes, 1); return -ENOSPC; } + ret = btrfs_qgroup_reserve(root, bytes); + if (ret) + goto out; data_sinfo->bytes_may_use += bytes; trace_btrfs_space_reservation(root->fs_info, "space_info", data_sinfo->flags, bytes, 1); +out: spin_unlock(&data_sinfo->lock); - return 0; + return ret; } /* @@ -3991,6 +3995,7 @@ void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) data_sinfo = root->fs_info->data_sinfo; spin_lock(&data_sinfo->lock); WARN_ON(data_sinfo->bytes_may_use < bytes); + btrfs_qgroup_free(root, bytes); data_sinfo->bytes_may_use -= bytes; trace_btrfs_space_reservation(root->fs_info, "space_info", data_sinfo->flags, bytes, 0); @@ -5391,8 +5396,7 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) spin_unlock(&BTRFS_I(inode)->lock); if (root->fs_info->quota_enabled) { - ret = btrfs_qgroup_reserve(root, num_bytes + - nr_extents * root->nodesize); + ret = btrfs_qgroup_reserve(root, nr_extents * root->nodesize); if (ret) goto out_fail; } @@ -5400,8 +5404,7 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush); if (unlikely(ret)) { if (root->fs_info->quota_enabled) - btrfs_qgroup_free(root, num_bytes + - nr_extents * root->nodesize); + btrfs_qgroup_free(root, nr_extents * root->nodesize); goto out_fail; } @@ -5522,8 +5525,7 @@ void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) trace_btrfs_space_reservation(root->fs_info, "delalloc", btrfs_ino(inode), to_free, 0); if (root->fs_info->quota_enabled) { - btrfs_qgroup_free(root, num_bytes + - dropped * root->nodesize); + btrfs_qgroup_free(root, dropped * root->nodesize); } btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv, diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index fd105c1..faef1d6 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -2549,7 +2549,6 @@ static long btrfs_fallocate(struct file *file, int mode, { struct inode *inode = file_inode(file); struct extent_state *cached_state = NULL; - struct btrfs_root *root = BTRFS_I(inode)->root; u64 cur_offset; u64 last_byte; u64 alloc_start; @@ -2577,11 +2576,6 @@ static long btrfs_fallocate(struct file *file, int mode, ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start); if (ret) return ret; - if (root->fs_info->quota_enabled) { - ret = btrfs_qgroup_reserve(root, alloc_end - alloc_start); - if (ret) - goto out_reserve_fail; - } mutex_lock(&inode->i_mutex); ret = inode_newsize_ok(inode, alloc_end); @@ -2674,6 +2668,7 @@ static long btrfs_fallocate(struct file *file, int mode, } else if (actual_end > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE)) { struct btrfs_trans_handle *trans; + struct btrfs_root *root = BTRFS_I(inode)->root; /* * We didn't need to allocate any more space, but we @@ -2710,9 +2705,6 @@ static long btrfs_fallocate(struct file *file, int mode, &cached_state, GFP_NOFS); out: mutex_unlock(&inode->i_mutex); - if (root->fs_info->quota_enabled) - btrfs_qgroup_free(root, alloc_end - alloc_start); -out_reserve_fail: /* Let go of our reservation. */ btrfs_free_reserved_data_space(inode, alloc_end - alloc_start); return ret; |