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ext4: clean up GET_BLOCKS_PRE_IO error handling

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If the call to ext4_split_convert_extents() fails in the
EXT4_GET_BLOCKS_PRE_IO case within ext4_ext_handle_unwritten_extents(),
error out through the exit point at function end rather than jumping
through an intermediate point.  Fix the error handling in the event
ext4_split_convert_extents() returns 0, which it shouldn't do when
splitting an existing extent.  The current code returns the passed in
value of allocated (which is likely non-zero) while failing to set
m_flags, m_pblk, and m_len.

Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Link: https://lore.kernel.org/r/20200430185320.23001-4-enwlinux@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Whitney 2020-04-30 14:53:19 -04:00 committed by Theodore Ts'o
parent bee6cf00c7
commit 779e26517b
1 changed files with 20 additions and 6 deletions
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26
fs/ext4/extents.c
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@ -3818,12 +3818,25 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
trace_ext4_ext_handle_unwritten_extents(inode, map, flags,
allocated, newblock);
/* get_block() before submit the IO, split the extent */
/* get_block() before submitting IO, split the extent */
if (flags & EXT4_GET_BLOCKS_PRE_IO) {
ret = ext4_split_convert_extents(handle, inode, map, ppath,
flags | EXT4_GET_BLOCKS_CONVERT);
if (ret <= 0)
goto out;
if (ret < 0) {
err = ret;
goto out2;
}
/*
* shouldn't get a 0 return when splitting an extent unless
* m_len is 0 (bug) or extent has been corrupted
*/
if (unlikely(ret == 0)) {
EXT4_ERROR_INODE(inode,
"unexpected ret == 0, m_len = %u",
map->m_len);
err = -EFSCORRUPTED;
goto out2;
}
map->m_flags |= EXT4_MAP_UNWRITTEN;
goto out;
}
@ -3863,12 +3876,13 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
ret = ext4_ext_convert_to_initialized(handle, inode, map, ppath, flags);
if (ret >= 0)
ext4_update_inode_fsync_trans(handle, inode, 1);
out:
if (ret <= 0) {
err = ret;
goto out2;
} else
allocated = ret;
}
out:
allocated = ret;
map->m_flags |= EXT4_MAP_NEW;
map_out:
map->m_flags |= EXT4_MAP_MAPPED;