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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2014-02-21 03:17:35 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-02-21 03:17:35 +0100 |
| commit | a9b8241594adda0a7a4fb3b87bf29d2dff0d997d (patch) | |
| tree | 62187ae4b24c1a57a7eecf81b8e13f0d0be8050a | |
| parent | ext4: avoid exposure of stale data in ext4_punch_hole() (diff) | |
| download | linux-a9b8241594adda0a7a4fb3b87bf29d2dff0d997d.tar.xz linux-a9b8241594adda0a7a4fb3b87bf29d2dff0d997d.zip | |
ext4: merge uninitialized extents
Allow for merging uninitialized extents.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/extents.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 9875fd0918e7..ef4b535e0a02 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -1691,7 +1691,7 @@ ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1, * the extent that was written properly split out and conversion to * initialized is trivial. */ - if (ext4_ext_is_uninitialized(ex1) || ext4_ext_is_uninitialized(ex2)) + if (ext4_ext_is_uninitialized(ex1) != ext4_ext_is_uninitialized(ex2)) return 0; ext1_ee_len = ext4_ext_get_actual_len(ex1); @@ -1708,6 +1708,11 @@ ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1, */ if (ext1_ee_len + ext2_ee_len > EXT_INIT_MAX_LEN) return 0; + if (ext4_ext_is_uninitialized(ex1) && + (ext4_test_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN) || + atomic_read(&EXT4_I(inode)->i_unwritten) || + (ext1_ee_len + ext2_ee_len > EXT_UNINIT_MAX_LEN))) + return 0; #ifdef AGGRESSIVE_TEST if (ext1_ee_len >= 4) return 0; @@ -1731,7 +1736,7 @@ static int ext4_ext_try_to_merge_right(struct inode *inode, { struct ext4_extent_header *eh; unsigned int depth, len; - int merge_done = 0; + int merge_done = 0, uninit; depth = ext_depth(inode); BUG_ON(path[depth].p_hdr == NULL); @@ -1741,8 +1746,11 @@ static int ext4_ext_try_to_merge_right(struct inode *inode, if (!ext4_can_extents_be_merged(inode, ex, ex + 1)) break; /* merge with next extent! */ + uninit = ext4_ext_is_uninitialized(ex); ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) + ext4_ext_get_actual_len(ex + 1)); + if (uninit) + ext4_ext_mark_uninitialized(ex); if (ex + 1 < EXT_LAST_EXTENT(eh)) { len = (EXT_LAST_EXTENT(eh) - ex - 1) @@ -1896,7 +1904,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode, struct ext4_ext_path *npath = NULL; int depth, len, err; ext4_lblk_t next; - int mb_flags = 0; + int mb_flags = 0, uninit; if (unlikely(ext4_ext_get_actual_len(newext) == 0)) { EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0"); @@ -1946,9 +1954,11 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode, path + depth); if (err) return err; - + uninit = ext4_ext_is_uninitialized(ex); ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) + ext4_ext_get_actual_len(newext)); + if (uninit) + ext4_ext_mark_uninitialized(ex); eh = path[depth].p_hdr; nearex = ex; goto merge; @@ -1971,10 +1981,13 @@ prepend: if (err) return err; + uninit = ext4_ext_is_uninitialized(ex); ex->ee_block = newext->ee_block; ext4_ext_store_pblock(ex, ext4_ext_pblock(newext)); ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) + ext4_ext_get_actual_len(newext)); + if (uninit) + ext4_ext_mark_uninitialized(ex); eh = path[depth].p_hdr; nearex = ex; goto merge; |