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Btrfs: hooks to reserve qgroup space

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Like block reserves, reserve a small piece of space on each
transaction start and for delalloc. These are the hooks that
can actually return EDQUOT to the user.
The amount of space reserved is tracked in the transaction
handle.

Signed-off-by: Arne Jansen <sensille@gmx.net>
This commit is contained in:
Arne Jansen 2011-09-14 15:44:05 +02:00 • committed by Jan Schmidt
parent 546adb0d81
commit c556723794
3 changed files with 29 additions and 0 deletions
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12
fs/btrfs/extent-tree.c
View file

@ -4565,6 +4565,13 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
csum_bytes = BTRFS_I(inode)->csum_bytes;
spin_unlock(&BTRFS_I(inode)->lock);
if (root->fs_info->quota_enabled) {
ret = btrfs_qgroup_reserve(root, num_bytes +
nr_extents * root->leafsize);
if (ret)
return ret;
}
ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush);
if (ret) {
u64 to_free = 0;
@ -4643,6 +4650,11 @@ 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->leafsize);
}
btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv,
to_free);
}