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Btrfs: Add a per-inode csum mutex to avoid races creating csum items 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-06-25 16:01:31 -04:00
parent 079899c238
commit 1b1e2135dc
6 changed files with 21 additions and 6 deletions
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1
fs/btrfs/btrfs_inode.h
View File

@ -30,6 +30,7 @@ struct btrfs_inode {
struct extent_map_tree extent_tree;
struct extent_io_tree io_tree;
struct extent_io_tree io_failure_tree;
struct mutex csum_mutex;
struct inode vfs_inode;
atomic_t ordered_writeback;

6
fs/btrfs/file.c
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@ -267,13 +267,13 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
/* FIXME...EIEIO, ENOSPC and more */
/* insert any holes we need to create */
if (isize < end_pos) {
if (isize < start_pos) {
u64 last_pos_in_file;
u64 hole_size;
u64 mask = root->sectorsize - 1;
last_pos_in_file = (isize + mask) & ~mask;
hole_size = (end_pos - last_pos_in_file + mask) & ~mask;
if (last_pos_in_file < end_pos) {
hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
if (last_pos_in_file < start_pos) {
err = btrfs_drop_extents(trans, root, inode,
last_pos_in_file,
last_pos_in_file + hole_size,

6
fs/btrfs/inode.c
View File

@ -351,7 +351,9 @@ int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
mutex_lock(&BTRFS_I(inode)->csum_mutex);
btrfs_csum_file_blocks(trans, root, inode, bio, sums);
mutex_unlock(&BTRFS_I(inode)->csum_mutex);
ret = btrfs_end_transaction(trans, root);
BUG_ON(ret);
@ -1400,6 +1402,7 @@ static int btrfs_init_locked_inode(struct inode *inode, void *p)
inode->i_mapping, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
inode->i_mapping, GFP_NOFS);
mutex_init(&BTRFS_I(inode)->csum_mutex);
atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
return 0;
}
@ -1701,6 +1704,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
inode->i_mapping, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
inode->i_mapping, GFP_NOFS);
mutex_init(&BTRFS_I(inode)->csum_mutex);
atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
BTRFS_I(inode)->delalloc_bytes = 0;
BTRFS_I(inode)->root = root;
@ -1924,6 +1928,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
inode->i_mapping, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
inode->i_mapping, GFP_NOFS);
mutex_init(&BTRFS_I(inode)->csum_mutex);
BTRFS_I(inode)->delalloc_bytes = 0;
atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
@ -2862,6 +2867,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
inode->i_mapping, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
inode->i_mapping, GFP_NOFS);
mutex_init(&BTRFS_I(inode)->csum_mutex);
BTRFS_I(inode)->delalloc_bytes = 0;
atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;

5
fs/btrfs/ordered-data.c
View File

@ -152,12 +152,13 @@ int btrfs_add_ordered_inode(struct inode *inode)
inode->i_ino, &entry->rb_node);
BTRFS_I(inode)->ordered_trans = transid;
if (!node)
igrab(inode);
write_unlock(&tree->lock);
if (node)
kfree(entry);
else
igrab(inode);
return 0;
}

2
fs/btrfs/transaction.c
View File

@ -477,7 +477,7 @@ static noinline int drop_dirty_roots(struct btrfs_root *tree_root,
if (err)
ret = err;
nr = trans->blocks_used;
ret = btrfs_end_transaction(trans, tree_root);
ret = btrfs_end_transaction_throttle(trans, tree_root);
BUG_ON(ret);
mutex_unlock(&root->fs_info->drop_mutex);

7
fs/btrfs/tree-defrag.c
View File

@ -38,8 +38,15 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
u64 last_ret = 0;
if (root->fs_info->extent_root == root) {
/*
* there's recursion here right now in the tree locking,
* we can't defrag the extent root without deadlock
*/
goto out;
#if 0
mutex_lock(&root->fs_info->alloc_mutex);
is_extent = 1;
#endif
}
if (root->ref_cows == 0 && !is_extent)