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ext4: fix sleep inside spinlock issue with quota and dealloc (#14739)

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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>
This commit is contained in:
Dmitry Monakhov 2009-12-10 16:36:27 +00:00 committed by Jan Kara
parent d21cd8f163
commit 39bc680a81
1 changed files with 5 additions and 6 deletions
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11
fs/ext4/inode.c
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@ -1816,19 +1816,17 @@ 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);
vfs_dq_release_reservation_block(inode, total);
if (ext4_should_retry_alloc(inode->i_sb, &retries)) {
yield();
@ -1836,10 +1834,11 @@ repeat:
}
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 */
}