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ext4: if zeroout fails fall back to splitting the extent node 

If the underlying storage device is using thin-provisioning, it's
possible for a zeroout operation to return ENOSPC.

Commit df22291ff0 ("ext4: Retry block allocation if we have free blocks
left") added logic to retry block allocation since we might get free block
after we commit a transaction. But the ENOSPC from thin-provisioning
will confuse ext4, and lead to an infinite loop.

Since using zeroout instead of splitting the extent node is an
optimization, if it fails, we might as well fall back to splitting the
extent node.

Reported-by: yangerkun <yangerkun@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2021-08-13 11:20:48 -04:00
parent facec450a8
commit 308c57ccf4
1 changed files with 3 additions and 2 deletions
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5
fs/ext4/extents.c
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@ -3569,7 +3569,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
split_map.m_len - ee_block);
err = ext4_ext_zeroout(inode, &zero_ex1);
if (err)
goto out;
goto fallback;
split_map.m_len = allocated;
}
if (split_map.m_lblk - ee_block + split_map.m_len <
@ -3583,7 +3583,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
ext4_ext_pblock(ex));
err = ext4_ext_zeroout(inode, &zero_ex2);
if (err)
goto out;
goto fallback;
}
split_map.m_len += split_map.m_lblk - ee_block;
@ -3592,6 +3592,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
}
}
fallback:
err = ext4_split_extent(handle, inode, ppath, &split_map, split_flag,
flags);
if (err > 0)