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authorTheodore Ts'o <tytso@mit.edu>2016-04-01 01:31:28 -0400
committerTheodore Ts'o <tytso@mit.edu>2016-04-01 01:31:28 -0400
commitdaf647d2dd58cec59570d7698a45b98e580f2076 (patch)
tree91d950bb640b3e16c36bf09265d46bd07dd0fba0 /fs/ext4/move_extent.c
parent1028b55bafb7611dda1d8fed2aeca16a436b7dff (diff)
downloadlinux-daf647d2dd58cec59570d7698a45b98e580f2076.tar.bz2
ext4: add lockdep annotations for i_data_sem
With the internal Quota feature, mke2fs creates empty quota inodes and quota usage tracking is enabled as soon as the file system is mounted. Since quotacheck is no longer preallocating all of the blocks in the quota inode that are likely needed to be written to, we are now seeing a lockdep false positive caused by needing to allocate a quota block from inside ext4_map_blocks(), while holding i_data_sem for a data inode. This results in this complaint: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem); lock(&s->s_dquot.dqio_mutex); lock(&ei->i_data_sem); lock(&s->s_dquot.dqio_mutex); Google-Bug-Id: 27907753 Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/move_extent.c')
-rw-r--r--fs/ext4/move_extent.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 4098acc701c3..796ff0eafd3c 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -60,10 +60,10 @@ ext4_double_down_write_data_sem(struct inode *first, struct inode *second)
{
if (first < second) {
down_write(&EXT4_I(first)->i_data_sem);
- down_write_nested(&EXT4_I(second)->i_data_sem, SINGLE_DEPTH_NESTING);
+ down_write_nested(&EXT4_I(second)->i_data_sem, I_DATA_SEM_OTHER);
} else {
down_write(&EXT4_I(second)->i_data_sem);
- down_write_nested(&EXT4_I(first)->i_data_sem, SINGLE_DEPTH_NESTING);
+ down_write_nested(&EXT4_I(first)->i_data_sem, I_DATA_SEM_OTHER);
}
}
@@ -484,6 +484,13 @@ mext_check_arguments(struct inode *orig_inode,
return -EBUSY;
}
+ if (IS_NOQUOTA(orig_inode) || IS_NOQUOTA(donor_inode)) {
+ ext4_debug("ext4 move extent: The argument files should "
+ "not be quota files [ino:orig %lu, donor %lu]\n",
+ orig_inode->i_ino, donor_inode->i_ino);
+ return -EBUSY;
+ }
+
/* Ext4 move extent supports only extent based file */
if (!(ext4_test_inode_flag(orig_inode, EXT4_INODE_EXTENTS))) {
ext4_debug("ext4 move extent: orig file is not extents "