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ext4: Reserve revoke credits for freed blocks

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So far we have reserved only relatively high fixed amount of revoke
credits for each transaction. We over-reserved by large amount for most
cases but when freeing large directories or files with data journalling,
the fixed amount is not enough. In fact the worst case estimate is
inconveniently large (maximum extent size) for freeing of one extent.

We fix this by doing proper estimate of the amount of blocks that need
to be revoked when removing blocks from the inode due to truncate or
hole punching and otherwise reserve just a small amount of revoke
credits for each transaction to accommodate freeing of xattrs block or
so.

Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20191105164437.32602-23-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara
2019-11-05 17:44:29 +01:00
committed by Theodore Ts'o
parent d090707eda
commit 83448bdfb5
11 changed files with 140 additions and 67 deletions
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2
fs/ext4/inode.c
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@@ -5949,7 +5949,7 @@ static int ext4_try_to_expand_extra_isize(struct inode *inode,
* force a large enough s_min_extra_isize.
*/
if (ext4_journal_extend(handle,
EXT4_DATA_TRANS_BLOCKS(inode->i_sb)) != 0)
EXT4_DATA_TRANS_BLOCKS(inode->i_sb), 0) != 0)
return -ENOSPC;
if (ext4_write_trylock_xattr(inode, &no_expand) == 0)