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ext4: clean up ext4_ext_convert_to_initialized() error handling

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If ext4_ext_convert_to_initialized() fails when called within
ext4_ext_handle_unwritten_extents(), immediately error out through the
exit point at function end.  Fix the error handling in the event
ext4_ext_convert_to_initialized() returns 0, which it shouldn't do when
converting 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/20200430185320.23001-5-enwlinux@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Whitney 2020-04-30 14:53:20 -04:00 committed by Theodore Ts'o
parent 779e26517b
commit be809e1274
1 changed files with 18 additions and 5 deletions
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23
fs/ext4/extents.c
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@ -3872,15 +3872,28 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
goto out1;
}
/* buffered write, writepage time, convert*/
/*
* Default case when (flags & EXT4_GET_BLOCKS_CREATE) == 1.
* For buffered writes, at writepage time, etc. Convert a
* discovered unwritten extent to written.
*/
ret = ext4_ext_convert_to_initialized(handle, inode, map, ppath, flags);
if (ret >= 0)
ext4_update_inode_fsync_trans(handle, inode, 1);
if (ret <= 0) {
if (ret < 0) {
err = ret;
goto out2;
}
ext4_update_inode_fsync_trans(handle, inode, 1);
/*
* shouldn't get a 0 return when converting an unwritten 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;
}
out:
allocated = ret;
map->m_flags |= EXT4_MAP_NEW;