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btrfs: extent-tree: Add new version of btrfs_delalloc_reserve/release_space 

Add new version of btrfs_delalloc_reserve_space() and
btrfs_delalloc_release_space() functions, which supports accurate qgroup
reserve.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
steinar/wifi_calib_4_9_kernel
Qu Wenruo 2015-09-08 17:25:53 +08:00 committed by Chris Mason
parent d9d8b2a51a
commit 1ada3a62b5
2 changed files with 61 additions and 0 deletions
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2
fs/btrfs/ctree.h
View File

@ -3473,7 +3473,9 @@ 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_delalloc_release_space(struct inode *inode, u64 start, u64 len);
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,
unsigned short type);

59
fs/btrfs/extent-tree.c
View File

@ -5714,6 +5714,44 @@ void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes)
to_free);
}
/**
* __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, start, len);
return ret;
}
/**
* btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc
* @inode: inode we're writing to
@ -5746,6 +5784,27 @@ int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes)
return 0;
}
/**
* __btrfs_delalloc_release_space - release data and metadata space for delalloc
* @inode: inode we're releasing space for
* @start: start position of the space already reserved
* @len: the len of the space already reserved
*
* This must be matched with a call to btrfs_delalloc_reserve_space. This is
* called in the case that we don't need the metadata AND data reservations
* anymore. So if there is an error or we insert an inline extent.
*
* This function will release the metadata space that was not used and will
* decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes
* list if there are no delalloc bytes left.
* Also it will handle the qgroup reserved space.
*/
void __btrfs_delalloc_release_space(struct inode *inode, u64 start, u64 len)
{
btrfs_delalloc_release_metadata(inode, len);
__btrfs_free_reserved_data_space(inode, start, len);
}
/**
* btrfs_delalloc_release_space - release data and metadata space for delalloc
* @inode: inode we're releasing space for