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Btrfs: don't take inode delalloc mutex if we're a free space inode

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This confuses and angers lockdep even though it's ok.  We don't really need
the lock for free space inodes since only the transaction committer will be
reserving space.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Josef Bacik 2012-12-14 13:48:14 -05:00 committed by Chris Mason
parent 1135d6df22
commit c64c2bd890
1 changed files with 19 additions and 6 deletions
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25
fs/btrfs/extent-tree.c
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@ -4535,16 +4535,25 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
int extra_reserve = 0;
enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL;
int ret;
bool delalloc_lock = true;
/* Need to be holding the i_mutex here if we aren't free space cache */
if (btrfs_is_free_space_inode(inode))
/* If we are a free space inode we need to not flush since we will be in
* the middle of a transaction commit. We also don't need the delalloc
* mutex since we won't race with anybody. We need this mostly to make
* lockdep shut its filthy mouth.
*/
if (btrfs_is_free_space_inode(inode)) {
flush = BTRFS_RESERVE_NO_FLUSH;
delalloc_lock = false;
}
if (flush != BTRFS_RESERVE_NO_FLUSH &&
btrfs_transaction_in_commit(root->fs_info))
schedule_timeout(1);
mutex_lock(&BTRFS_I(inode)->delalloc_mutex);
if (delalloc_lock)
mutex_lock(&BTRFS_I(inode)->delalloc_mutex);
num_bytes = ALIGN(num_bytes, root->sectorsize);
spin_lock(&BTRFS_I(inode)->lock);
@ -4577,7 +4586,8 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
spin_lock(&BTRFS_I(inode)->lock);
calc_csum_metadata_size(inode, num_bytes, 0);
spin_unlock(&BTRFS_I(inode)->lock);
mutex_unlock(&BTRFS_I(inode)->delalloc_mutex);
if (delalloc_lock)
mutex_unlock(&BTRFS_I(inode)->delalloc_mutex);
return ret;
}
}
@ -4616,7 +4626,8 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
btrfs_qgroup_free(root, num_bytes +
nr_extents * root->leafsize);
}
mutex_unlock(&BTRFS_I(inode)->delalloc_mutex);
if (delalloc_lock)
mutex_unlock(&BTRFS_I(inode)->delalloc_mutex);
return ret;
}
@ -4628,7 +4639,9 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
}
BTRFS_I(inode)->reserved_extents += nr_extents;
spin_unlock(&BTRFS_I(inode)->lock);
mutex_unlock(&BTRFS_I(inode)->delalloc_mutex);
if (delalloc_lock)
mutex_unlock(&BTRFS_I(inode)->delalloc_mutex);
if (to_reserve)
trace_btrfs_space_reservation(root->fs_info,"delalloc",