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ext4: handle transient ENOSPC properly for DAX 

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@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2016-05-13 00:38:16 -04:00 committed by Theodore Ts'o
parent aef39ab153
commit 7cb476f834
1 changed files with 20 additions and 55 deletions
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75
fs/ext4/inode.c
View File

@ -3232,72 +3232,37 @@ 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;
ret = ext4_get_block_trans(inode, iblock, bh_result,
EXT4_GET_BLOCKS_CONVERT |
EXT4_GET_BLOCKS_CREATE_ZERO);
if (ret < 0)
return ret;
}
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;
}
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