From 7841cb2898f66a73062c64d0ef5733dde7279e46 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Tue, 31 May 2011 18:07:27 +0200
Subject: [PATCH] btrfs: add helper for fs_info->closing
wrap checking of filesystem 'closing' flag and fix a few missing memory
barriers.
Signed-off-by: David Sterba <dsterba@suse.cz>
---
fs/btrfs/ctree.h | 9 +++++++++
fs/btrfs/extent-tree.c | 3 +--
fs/btrfs/file.c | 4 ++--
fs/btrfs/free-space-cache.c | 10 ++++------
fs/btrfs/inode-map.c | 3 +--
fs/btrfs/inode.c | 3 +--
fs/btrfs/scrub.c | 2 +-
fs/btrfs/transaction.c | 2 +-
8 files changed, 20 insertions(+), 16 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 4958ef5417d6b..8490ee0637099 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -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,
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index c9173a7827b05..5b9b6b6df242a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -366,8 +366,7 @@ static int caching_kthread(void *data)
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;
}
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 982b5ea9762f2..fa4ef18b66b15 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -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);
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index bffa5c4a633b0..ad144736a5fd8 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -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();
diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
index cb79b8975c9f1..b4087e0fa8714 100644
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -62,8 +62,7 @@ static int caching_kthread(void *data)
goto out;
while (1) {
- smp_mb();
- if (fs_info->closing)
+ if (btrfs_fs_closing(fs_info))
goto out;
leaf = path->nodes[0];
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index a83e44bf32062..02ff4a1b968b1 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -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) {
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 1204eab94028d..df50fd1eca8f4 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -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;
/*
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 2d5c6d2aa4e43..dd719662340ed 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -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;
--
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