Add new version of btrfs_delalloc_reserve_space() function, which supports accurate qgroup reserve.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com> --- fs/btrfs/ctree.h | 1 + fs/btrfs/extent-tree.c | 38 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 39 insertions(+) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index c1a0aaf..12f14fd 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3472,6 +3472,7 @@ void btrfs_subvolume_release_metadata(struct btrfs_root *root, int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes); void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes); int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes); +int __btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len); void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes); void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type); struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 2e3f19e..07f45b7 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -5686,6 +5686,44 @@ void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) } /** + * __btrfs_delalloc_reserve_space - reserve data and metadata space for + * delalloc + * @inode: inode we're writing to + * @start: start range we are writing to + * @len: how long the range we are writing to + * + * TODO: This function will finally replace old btrfs_delalloc_reserve_space() + * + * This will do the following things + * + * o reserve space in data space info for num bytes + * and reserve precious corresponding qgroup space + * (Done in check_data_free_space) + * + * o reserve space for metadata space, based on the number of outstanding + * extents and how much csums will be needed + * also reserve metadata space in a per root over-reserve method. + * o add to the inodes->delalloc_bytes + * o add it to the fs_info's delalloc inodes list. + * (Above 3 all done in delalloc_reserve_metadata) + * + * Return 0 for success + * Return <0 for error(-ENOSPC or -EQUOT) + */ +int __btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len) +{ + int ret; + + ret = __btrfs_check_data_free_space(inode, start, len); + if (ret < 0) + return ret; + ret = btrfs_delalloc_reserve_metadata(inode, len); + if (ret < 0) + btrfs_free_reserved_data_space(inode, len); + return ret; +} + +/** * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc * @inode: inode we're writing to * @num_bytes: the number of bytes we want to allocate -- 2.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html