Currently in btrfs, for data space reservation, it does not update
bytes_may_use in btrfs_update_reserved_bytes() and the decrease operation
will be delayed to be done in extent_clear_unlock_delalloc(), for
fallocate(2), decrease operation is even delayed to be done in end
of btrfs_fallocate(), which is too late. Obviously such delay will
cause unnecessary pressure to enospc system, in [PATCH 4/4], there is
a simpel test script that can reveal such false ENOSPC bug.
So in this patch set, it will remove RESERVE_FREE, RESERVE_ALLOC and
RESERVE_ALLOC_NO_ACCOUNT, and we always update bytes_may_use timely.
I'll also commit a fstests test case for this issue.
Wang Xiaoguang (4):
btrfs: use correct offset for reloc_inode in
prealloc_file_extent_cluster()
btrfs: divide btrfs_update_reserved_bytes() into two functions
btrfs: introduce new EXTENT_CLEAR_DATA_RESV flag
btrfs: update btrfs_space_info's bytes_may_use timely
fs/btrfs/ctree.h | 2 +-
fs/btrfs/extent-tree.c | 131 ++++++++++++++++++++++++-------------------------
fs/btrfs/extent_io.h | 1 +
fs/btrfs/file.c | 26 +++++-----
fs/btrfs/inode-map.c | 3 +-
fs/btrfs/inode.c | 37 ++++++++++----
fs/btrfs/relocation.c | 17 +++++--
7 files changed, 123 insertions(+), 94 deletions(-)
--
2.9.0
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