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btrfs: use proper type for failrec in extent_state 

We use the private member of extent_state to store the failrec and play
pointless pointer games.

Signed-off-by: David Sterba <dsterba@suse.com>
steinar/wifi_calib_4_9_kernel
David Sterba 2016-02-11 13:24:13 +01:00
parent 04b285f35e
commit 47dc196ae7
2 changed files with 16 additions and 20 deletions
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31
fs/btrfs/extent_io.c
View File

@ -232,7 +232,7 @@ static struct extent_state *alloc_extent_state(gfp_t mask)
if (!state)
return state;
state->state = 0;
state->private = 0;
state->failrec = NULL;
RB_CLEAR_NODE(&state->rb_node);
btrfs_leak_debug_add(&state->leak_list, &states);
atomic_set(&state->refs, 1);
@ -1844,7 +1844,8 @@ out:
* set the private field for a given byte offset in the tree. If there isn't
* an extent_state there already, this does nothing.
*/
static int set_state_private(struct extent_io_tree *tree, u64 start, u64 private)
static int set_state_failrec(struct extent_io_tree *tree, u64 start,
struct io_failure_record *failrec)
{
struct rb_node *node;
struct extent_state *state;
@ -1865,13 +1866,14 @@ static int set_state_private(struct extent_io_tree *tree, u64 start, u64 private
ret = -ENOENT;
goto out;
}
state->private = private;
state->failrec = failrec;
out:
spin_unlock(&tree->lock);
return ret;
}
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private)
static int get_state_failrec(struct extent_io_tree *tree, u64 start,
struct io_failure_record **failrec)
{
struct rb_node *node;
struct extent_state *state;
@ -1892,7 +1894,7 @@ int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private)
ret = -ENOENT;
goto out;
}
*private = state->private;
*failrec = state->failrec;
out:
spin_unlock(&tree->lock);
return ret;
@ -1972,7 +1974,7 @@ int free_io_failure(struct inode *inode, struct io_failure_record *rec)
int err = 0;
struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
set_state_private(failure_tree, rec->start, 0);
set_state_failrec(failure_tree, rec->start, NULL);
ret = clear_extent_bits(failure_tree, rec->start,
rec->start + rec->len - 1,
EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
@ -2089,7 +2091,6 @@ int clean_io_failure(struct inode *inode, u64 start, struct page *page,
unsigned int pg_offset)
{
u64 private;
u64 private_failure;
struct io_failure_record *failrec;
struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
struct extent_state *state;
@ -2102,12 +2103,11 @@ int clean_io_failure(struct inode *inode, u64 start, struct page *page,
if (!ret)
return 0;
ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start,
&private_failure);
ret = get_state_failrec(&BTRFS_I(inode)->io_failure_tree, start,
&failrec);
if (ret)
return 0;
failrec = (struct io_failure_record *)(unsigned long) private_failure;
BUG_ON(!failrec->this_mirror);
if (failrec->in_validation) {
@ -2167,7 +2167,7 @@ void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end)
next = next_state(state);
failrec = (struct io_failure_record *)(unsigned long)state->private;
failrec = state->failrec;
free_extent_state(state);
kfree(failrec);
@ -2177,10 +2177,9 @@ void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end)
}
int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
struct io_failure_record **failrec_ret)
struct io_failure_record **failrec_ret)
{
struct io_failure_record *failrec;
u64 private;
struct extent_map *em;
struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
@ -2188,7 +2187,7 @@ int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
int ret;
u64 logical;
ret = get_state_private(failure_tree, start, &private);
ret = get_state_failrec(failure_tree, start, &failrec);
if (ret) {
failrec = kzalloc(sizeof(*failrec), GFP_NOFS);
if (!failrec)
@ -2237,8 +2236,7 @@ int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
ret = set_extent_bits(failure_tree, start, end,
EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
if (ret >= 0)
ret = set_state_private(failure_tree, start,
(u64)(unsigned long)failrec);
ret = set_state_failrec(failure_tree, start, failrec);
/* set the bits in the inode's tree */
if (ret >= 0)
ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED,
@ -2248,7 +2246,6 @@ int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
return ret;
}
} else {
failrec = (struct io_failure_record *)(unsigned long)private;
pr_debug("Get IO Failure Record: (found) logical=%llu, start=%llu, len=%llu, validation=%d\n",
failrec->logical, failrec->start, failrec->len,
failrec->in_validation);

5
fs/btrfs/extent_io.h
View File

@ -62,6 +62,7 @@
struct extent_state;
struct btrfs_root;
struct btrfs_io_bio;
struct io_failure_record;
typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
struct bio *bio, int mirror_num,
@ -112,8 +113,7 @@ struct extent_state {
atomic_t refs;
unsigned state;
/* for use by the FS */
u64 private;
struct io_failure_record *failrec;
#ifdef CONFIG_BTRFS_DEBUG
struct list_head leak_list;
@ -345,7 +345,6 @@ int extent_readpages(struct extent_io_tree *tree,
get_extent_t get_extent);
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len, get_extent_t *get_extent);
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
void set_page_extent_mapped(struct page *page);
struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,