| From | Greg Kroah-Hartman <> | Subject | [PATCH 84/97] ext4: fix sleep inside spinlock issue with quota and dealloc (#14739) | Date | Mon, 4 Jan 2010 16:33:37 -0800 |
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From: Dmitry Monakhov <dmonakhov@openvz.org>
commit 39bc680a8160bb9d6743f7873b535d553ff61058 upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- 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 9fc624d..f91046e 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1858,19 +1858,17 @@ 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(); @@ -1878,10 +1876,11 @@ 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 */ } -- 1.6.6
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