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Btrfs: add a delalloc mutex to inodes for delalloc reservations

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I was using i_mutex for this, but we're getting bogus lockdep warnings by doing
that and theres no real way to get rid of those, so just stop using i_mutex to
protect delalloc metadata reservations and use a delalloc mutex instead.  This
shouldn't be contended often at all, only if you are writing and mmap writing to
the file at the same time.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik
2012-01-13 12:09:22 -05:00
committed by Chris Mason
parent 8c2a3ca20f
commit f248679e86
5 changed files with 7 additions and 16 deletions
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11
fs/btrfs/inode.c
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@@ -2239,14 +2239,7 @@ int btrfs_orphan_cleanup(struct btrfs_root *root)
continue;
}
nr_truncate++;
/*
* Need to hold the imutex for reservation purposes, not
* a huge deal here but I have a WARN_ON in
* btrfs_delalloc_reserve_space to catch offenders.
*/
mutex_lock(&inode->i_mutex);
ret = btrfs_truncate(inode);
mutex_unlock(&inode->i_mutex);
} else {
nr_unlink++;
}
@@ -6411,10 +6404,7 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
u64 page_start;
u64 page_end;
/* Need this to keep space reservations serialized */
mutex_lock(&inode->i_mutex);
ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
mutex_unlock(&inode->i_mutex);
if (!ret)
ret = btrfs_update_time(vma->vm_file);
if (ret) {
@@ -6758,6 +6748,7 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
extent_io_tree_init(&ei->io_tree, &inode->i_data);
extent_io_tree_init(&ei->io_failure_tree, &inode->i_data);
mutex_init(&ei->log_mutex);
mutex_init(&ei->delalloc_mutex);
btrfs_ordered_inode_tree_init(&ei->ordered_tree);
INIT_LIST_HEAD(&ei->i_orphan);
INIT_LIST_HEAD(&ei->delalloc_inodes);