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btrfs: add helper for fs_info->closing

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wrap checking of filesystem 'closing' flag and fix a few missing memory
barriers.

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba 2011-05-31 18:07:27 +02:00 committed by Chris Mason
parent 4b9465cb9e
commit 7841cb2898
8 changed files with 20 additions and 16 deletions
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9
fs/btrfs/ctree.h
View File

@ -2354,6 +2354,15 @@ int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *node,
struct extent_buffer *parent);
static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
{
/*
* Get synced with close_ctree()
*/
smp_mb();
return fs_info->closing;
}
/* root-item.c */
int btrfs_find_root_ref(struct btrfs_root *tree_root,
struct btrfs_path *path,

3
fs/btrfs/extent-tree.c
View File

@ -366,8 +366,7 @@ again:
nritems = btrfs_header_nritems(leaf);
while (1) {
smp_mb();
if (fs_info->closing > 1) {
if (btrfs_fs_closing(fs_info) > 1) {
last = (u64)-1;
break;
}

4
fs/btrfs/file.c
View File

@ -129,7 +129,7 @@ int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
if (!btrfs_test_opt(root, AUTO_DEFRAG))
return 0;
if (root->fs_info->closing)
if (btrfs_fs_closing(root->fs_info))
return 0;
if (BTRFS_I(inode)->in_defrag)
@ -229,7 +229,7 @@ int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info)
first_ino = defrag->ino + 1;
rb_erase(&defrag->rb_node, &fs_info->defrag_inodes);
if (fs_info->closing)
if (btrfs_fs_closing(fs_info))
goto next_free;
spin_unlock(&fs_info->defrag_inodes_lock);

10
fs/btrfs/free-space-cache.c
View File

@ -98,7 +98,7 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
return inode;
spin_lock(&block_group->lock);
if (!root->fs_info->closing) {
if (!btrfs_fs_closing(root->fs_info)) {
block_group->inode = igrab(inode);
block_group->iref = 1;
}
@ -493,8 +493,7 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
* If we're unmounting then just return, since this does a search on the
* normal root and not the commit root and we could deadlock.
*/
smp_mb();
if (fs_info->closing)
if (btrfs_fs_closing(fs_info))
return 0;
/*
@ -2513,7 +2512,7 @@ struct inode *lookup_free_ino_inode(struct btrfs_root *root,
return inode;
spin_lock(&root->cache_lock);
if (!root->fs_info->closing)
if (!btrfs_fs_closing(root->fs_info))
root->cache_inode = igrab(inode);
spin_unlock(&root->cache_lock);
@ -2543,8 +2542,7 @@ int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
* If we're unmounting then just return, since this does a search on the
* normal root and not the commit root and we could deadlock.
*/
smp_mb();
if (fs_info->closing)
if (btrfs_fs_closing(fs_info))
return 0;
path = btrfs_alloc_path();

3
fs/btrfs/inode-map.c
View File

@ -62,8 +62,7 @@ again:
goto out;
while (1) {
smp_mb();
if (fs_info->closing)
if (btrfs_fs_closing(fs_info))
goto out;
leaf = path->nodes[0];

3
fs/btrfs/inode.c
View File

@ -4266,8 +4266,7 @@ int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc)
if (BTRFS_I(inode)->dummy_inode)
return 0;
smp_mb();
if (root->fs_info->closing && is_free_space_inode(root, inode))
if (btrfs_fs_closing(root->fs_info) && is_free_space_inode(root, inode))
nolock = true;
if (wbc->sync_mode == WB_SYNC_ALL) {

2
fs/btrfs/scrub.c
View File

@ -1183,7 +1183,7 @@ int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
int ret;
struct btrfs_device *dev;
if (root->fs_info->closing)
if (btrfs_fs_closing(root->fs_info))
return -EINVAL;
/*

2
fs/btrfs/transaction.c
View File

@ -817,7 +817,7 @@ int btrfs_defrag_root(struct btrfs_root *root, int cacheonly)
btrfs_btree_balance_dirty(info->tree_root, nr);
cond_resched();
if (root->fs_info->closing || ret != -EAGAIN)
if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN)
break;
}
root->defrag_running = 0;