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List: linux-ext4
Subject: [PATCH 5/5] ext4: fix sleep inside spinlock issue with quota and dealloc (#14739)
From: Jan Kara <jack () suse ! cz>
Date: 2009-12-23 17:27:56
Message-ID: 1261589276-1380-6-git-send-email-jack () suse ! cz
[Download RAW message or body]
From: Dmitry Monakhov <dmonakhov@openvz.org>
Unlock i_block_reservation_lock before vfs_dq_reserve_block().
This patch fixes http://bugzilla.kernel.org/show_bug.cgi?id=14739
CC: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/ext4/inode.c | 11 +++++------
1 files changed, 5 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9307f4b..6b7735f 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1764,19 +1764,17 @@ repeat:
md_needed = mdblocks - EXT4_I(inode)->i_reserved_meta_blocks;
total = md_needed + nrblocks;
+ spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
/*
* Make quota reservation here to prevent quota overflow
* later. Real quota accounting is done at pages writeout
* time.
*/
- if (vfs_dq_reserve_block(inode, total)) {
- spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
+ if (vfs_dq_reserve_block(inode, total))
return -EDQUOT;
- }
if (ext4_claim_free_blocks(sbi, total)) {
- spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
if (ext4_should_retry_alloc(inode->i_sb, &retries)) {
yield();
goto repeat;
@@ -1784,10 +1782,11 @@ repeat:
vfs_dq_release_reservation_block(inode, total);
return -ENOSPC;
}
+ spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
EXT4_I(inode)->i_reserved_data_blocks += nrblocks;
- EXT4_I(inode)->i_reserved_meta_blocks = mdblocks;
-
+ EXT4_I(inode)->i_reserved_meta_blocks += md_needed;
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
+
return 0; /* success */
}
--
1.6.4.2
--
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