ext4_dax_get_blocks() was accidentally omitted fixing get blocks
handlers to properly handle transient ENOSPC errors. Fix it now to use
ext4_get_blocks_trans() helper which takes care of these errors.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/ext4/inode.c | 75 +++++++++++++++------------------------------------------
1 file changed, 20 insertions(+), 55 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 981a1fc30eaa..3e0c06028668 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3218,72 +3218,37 @@ static int ext4_releasepage(struct page *page, gfp_t wait)
int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
- int ret, err;
- int credits;
- struct ext4_map_blocks map;
- handle_t *handle = NULL;
- int flags = 0;
+ int ret;
ext4_debug("ext4_dax_mmap_get_block: inode %lu, create flag %d\n",
inode->i_ino, create);
- map.m_lblk = iblock;
- map.m_len = bh_result->b_size >> inode->i_blkbits;
- credits = ext4_chunk_trans_blocks(inode, map.m_len);
- if (create) {
- flags |= EXT4_GET_BLOCKS_PRE_IO | EXT4_GET_BLOCKS_CREATE_ZERO;
- handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, credits);
- if (IS_ERR(handle)) {
- ret = PTR_ERR(handle);
- return ret;
- }
- }
+ if (!create)
+ return _ext4_get_block(inode, iblock, bh_result, 0);
- ret = ext4_map_blocks(handle, inode, &map, flags);
- if (create) {
- err = ext4_journal_stop(handle);
- if (ret >= 0 && err < 0)
- ret = err;
- }
- if (ret <= 0)
- goto out;
- if (map.m_flags & EXT4_MAP_UNWRITTEN) {
- int err2;
+ ret = ext4_get_block_trans(inode, iblock, bh_result,
+ EXT4_GET_BLOCKS_PRE_IO |
+ EXT4_GET_BLOCKS_CREATE_ZERO);
+ if (ret < 0)
+ return ret;
+ if (buffer_unwritten(bh_result)) {
/*
* We are protected by i_mmap_sem so we know block cannot go
* away from under us even though we dropped i_data_sem.
* Convert extent to written and write zeros there.
- *
- * Note: We may get here even when create == 0.
*/
- handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, credits);
- if (IS_ERR(handle)) {
- ret = PTR_ERR(handle);
- goto out;
- }
-
- err = ext4_map_blocks(handle, inode, &map,
- EXT4_GET_BLOCKS_CONVERT | EXT4_GET_BLOCKS_CREATE_ZERO);
- if (err < 0)
- ret = err;
- err2 = ext4_journal_stop(handle);
- if (err2 < 0 && ret > 0)
- ret = err2;
- }
-out:
- WARN_ON_ONCE(ret == 0 && create);
- if (ret > 0) {
- map_bh(bh_result, inode->i_sb, map.m_pblk);
- /*
- * At least for now we have to clear BH_New so that DAX code
- * doesn't attempt to zero blocks again in a racy way.
- */
- map.m_flags &= ~EXT4_MAP_NEW;
- ext4_update_bh_state(bh_result, map.m_flags);
- bh_result->b_size = map.m_len << inode->i_blkbits;
- ret = 0;
+ ret = ext4_get_block_trans(inode, iblock, bh_result,
+ EXT4_GET_BLOCKS_CONVERT |
+ EXT4_GET_BLOCKS_CREATE_ZERO);
+ if (ret < 0)
+ return ret;
}
- return ret;
+ /*
+ * At least for now we have to clear BH_New so that DAX code
+ * doesn't attempt to zero blocks again in a racy way.
+ */
+ clear_buffer_new(bh_result);
+ return 0;
}
#endif
--
2.6.6
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