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authorJosef Bacik <jbacik@redhat.com>2009-02-20 11:00:09 -0500
committerChris Mason <chris.mason@oracle.com>2009-02-20 11:00:09 -0500
commit6a63209fc02d5483371f07e4913ee8abad608051 (patch)
tree7595e0df452928b677b66a64baf0cb3b7ec53dfc /fs/btrfs/btrfs_inode.h
parent2cfbd50b536c878e58ab3681c4e944fa3d99b415 (diff)
Btrfs: add better -ENOSPC handling
This is a step in the direction of better -ENOSPC handling. Instead of checking the global bytes counter we check the space_info bytes counters to make sure we have enough space. If we don't we go ahead and try to allocate a new chunk, and then if that fails we return -ENOSPC. This patch adds two counters to btrfs_space_info, bytes_delalloc and bytes_may_use. bytes_delalloc account for extents we've actually setup for delalloc and will be allocated at some point down the line. bytes_may_use is to keep track of how many bytes we may use for delalloc at some point. When we actually set the extent_bit for the delalloc bytes we subtract the reserved bytes from the bytes_may_use counter. This keeps us from not actually being able to allocate space for any delalloc bytes. Signed-off-by: Josef Bacik <jbacik@redhat.com>
Diffstat (limited to 'fs/btrfs/btrfs_inode.h')
-rw-r--r--fs/btrfs/btrfs_inode.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index a8c9693b75a..72677ce2b74 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -66,6 +66,9 @@ struct btrfs_inode {
*/
struct list_head delalloc_inodes;
+ /* the space_info for where this inode's data allocations are done */
+ struct btrfs_space_info *space_info;
+
/* full 64 bit generation number, struct vfs_inode doesn't have a big
* enough field for this.
*/
@@ -94,6 +97,11 @@ struct btrfs_inode {
*/
u64 delalloc_bytes;
+ /* total number of bytes that may be used for this inode for
+ * delalloc
+ */
+ u64 reserved_bytes;
+
/*
* the size of the file stored in the metadata on disk. data=ordered
* means the in-memory i_size might be larger than the size on disk