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Diffstat (limited to 'fs/btrfs/extent_io.c')
-rw-r--r--fs/btrfs/extent_io.c134
1 files changed, 91 insertions, 43 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 0cb88f8146e..96577e8bf9f 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -280,6 +280,14 @@ static struct extent_buffer *buffer_search(struct extent_io_tree *tree,
return NULL;
}
+static void merge_cb(struct extent_io_tree *tree, struct extent_state *new,
+ struct extent_state *other)
+{
+ if (tree->ops && tree->ops->merge_extent_hook)
+ tree->ops->merge_extent_hook(tree->mapping->host, new,
+ other);
+}
+
/*
* utility function to look for merge candidates inside a given range.
* Any extents with matching state are merged together into a single
@@ -303,6 +311,7 @@ static int merge_state(struct extent_io_tree *tree,
other = rb_entry(other_node, struct extent_state, rb_node);
if (other->end == state->start - 1 &&
other->state == state->state) {
+ merge_cb(tree, state, other);
state->start = other->start;
other->tree = NULL;
rb_erase(&other->rb_node, &tree->state);
@@ -314,33 +323,37 @@ static int merge_state(struct extent_io_tree *tree,
other = rb_entry(other_node, struct extent_state, rb_node);
if (other->start == state->end + 1 &&
other->state == state->state) {
+ merge_cb(tree, state, other);
other->start = state->start;
state->tree = NULL;
rb_erase(&state->rb_node, &tree->state);
free_extent_state(state);
+ state = NULL;
}
}
+
return 0;
}
-static void set_state_cb(struct extent_io_tree *tree,
+static int set_state_cb(struct extent_io_tree *tree,
struct extent_state *state,
unsigned long bits)
{
if (tree->ops && tree->ops->set_bit_hook) {
- tree->ops->set_bit_hook(tree->mapping->host, state->start,
- state->end, state->state, bits);
+ return tree->ops->set_bit_hook(tree->mapping->host,
+ state->start, state->end,
+ state->state, bits);
}
+
+ return 0;
}
static void clear_state_cb(struct extent_io_tree *tree,
struct extent_state *state,
unsigned long bits)
{
- if (tree->ops && tree->ops->clear_bit_hook) {
- tree->ops->clear_bit_hook(tree->mapping->host, state->start,
- state->end, state->state, bits);
- }
+ if (tree->ops && tree->ops->clear_bit_hook)
+ tree->ops->clear_bit_hook(tree->mapping->host, state, bits);
}
/*
@@ -358,6 +371,7 @@ static int insert_state(struct extent_io_tree *tree,
int bits)
{
struct rb_node *node;
+ int ret;
if (end < start) {
printk(KERN_ERR "btrfs end < start %llu %llu\n",
@@ -365,11 +379,14 @@ static int insert_state(struct extent_io_tree *tree,
(unsigned long long)start);
WARN_ON(1);
}
- if (bits & EXTENT_DIRTY)
- tree->dirty_bytes += end - start + 1;
state->start = start;
state->end = end;
- set_state_cb(tree, state, bits);
+ ret = set_state_cb(tree, state, bits);
+ if (ret)
+ return ret;
+
+ if (bits & EXTENT_DIRTY)
+ tree->dirty_bytes += end - start + 1;
state->state |= bits;
node = tree_insert(&tree->state, end, &state->rb_node);
if (node) {
@@ -387,6 +404,15 @@ static int insert_state(struct extent_io_tree *tree,
return 0;
}
+static int split_cb(struct extent_io_tree *tree, struct extent_state *orig,
+ u64 split)
+{
+ if (tree->ops && tree->ops->split_extent_hook)
+ return tree->ops->split_extent_hook(tree->mapping->host,
+ orig, split);
+ return 0;
+}
+
/*
* split a given extent state struct in two, inserting the preallocated
* struct 'prealloc' as the newly created second half. 'split' indicates an
@@ -405,6 +431,9 @@ static int split_state(struct extent_io_tree *tree, struct extent_state *orig,
struct extent_state *prealloc, u64 split)
{
struct rb_node *node;
+
+ split_cb(tree, orig, split);
+
prealloc->start = orig->start;
prealloc->end = split - 1;
prealloc->state = orig->state;
@@ -431,7 +460,8 @@ static int clear_state_bit(struct extent_io_tree *tree,
struct extent_state *state, int bits, int wake,
int delete)
{
- int ret = state->state & bits;
+ int bits_to_clear = bits & ~EXTENT_DO_ACCOUNTING;
+ int ret = state->state & bits_to_clear;
if ((bits & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) {
u64 range = state->end - state->start + 1;
@@ -439,7 +469,7 @@ static int clear_state_bit(struct extent_io_tree *tree,
tree->dirty_bytes -= range;
}
clear_state_cb(tree, state, bits);
- state->state &= ~bits;
+ state->state &= ~bits_to_clear;
if (wake)
wake_up(&state->wq);
if (delete || state->state == 0) {
@@ -542,8 +572,8 @@ hit_next:
if (err)
goto out;
if (state->end <= end) {
- set |= clear_state_bit(tree, state, bits,
- wake, delete);
+ set |= clear_state_bit(tree, state, bits, wake,
+ delete);
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
@@ -561,12 +591,11 @@ hit_next:
prealloc = alloc_extent_state(GFP_ATOMIC);
err = split_state(tree, state, prealloc, end + 1);
BUG_ON(err == -EEXIST);
-
if (wake)
wake_up(&state->wq);
- set |= clear_state_bit(tree, prealloc, bits,
- wake, delete);
+ set |= clear_state_bit(tree, prealloc, bits, wake, delete);
+
prealloc = NULL;
goto out;
}
@@ -667,16 +696,23 @@ out:
return 0;
}
-static void set_state_bits(struct extent_io_tree *tree,
+static int set_state_bits(struct extent_io_tree *tree,
struct extent_state *state,
int bits)
{
+ int ret;
+
+ ret = set_state_cb(tree, state, bits);
+ if (ret)
+ return ret;
+
if ((bits & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) {
u64 range = state->end - state->start + 1;
tree->dirty_bytes += range;
}
- set_state_cb(tree, state, bits);
state->state |= bits;
+
+ return 0;
}
static void cache_state(struct extent_state *state,
@@ -758,7 +794,10 @@ hit_next:
goto out;
}
- set_state_bits(tree, state, bits);
+ err = set_state_bits(tree, state, bits);
+ if (err)
+ goto out;
+
cache_state(state, cached_state);
merge_state(tree, state);
if (last_end == (u64)-1)
@@ -805,7 +844,9 @@ hit_next:
if (err)
goto out;
if (state->end <= end) {
- set_state_bits(tree, state, bits);
+ err = set_state_bits(tree, state, bits);
+ if (err)
+ goto out;
cache_state(state, cached_state);
merge_state(tree, state);
if (last_end == (u64)-1)
@@ -829,11 +870,13 @@ hit_next:
this_end = last_start - 1;
err = insert_state(tree, prealloc, start, this_end,
bits);
- cache_state(prealloc, cached_state);
- prealloc = NULL;
BUG_ON(err == -EEXIST);
- if (err)
+ if (err) {
+ prealloc = NULL;
goto out;
+ }
+ cache_state(prealloc, cached_state);
+ prealloc = NULL;
start = this_end + 1;
goto search_again;
}
@@ -852,7 +895,11 @@ hit_next:
err = split_state(tree, state, prealloc, end + 1);
BUG_ON(err == -EEXIST);
- set_state_bits(tree, prealloc, bits);
+ err = set_state_bits(tree, prealloc, bits);
+ if (err) {
+ prealloc = NULL;
+ goto out;
+ }
cache_state(prealloc, cached_state);
merge_state(tree, prealloc);
prealloc = NULL;
@@ -910,7 +957,8 @@ int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask)
{
return clear_extent_bit(tree, start, end,
- EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0,
+ EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING, 0, 0,
NULL, mask);
}
@@ -1355,12 +1403,7 @@ out_failed:
int extent_clear_unlock_delalloc(struct inode *inode,
struct extent_io_tree *tree,
u64 start, u64 end, struct page *locked_page,
- int unlock_pages,
- int clear_unlock,
- int clear_delalloc, int clear_dirty,
- int set_writeback,
- int end_writeback,
- int set_private2)
+ unsigned long op)
{
int ret;
struct page *pages[16];
@@ -1370,17 +1413,21 @@ int extent_clear_unlock_delalloc(struct inode *inode,
int i;
int clear_bits = 0;
- if (clear_unlock)
+ if (op & EXTENT_CLEAR_UNLOCK)
clear_bits |= EXTENT_LOCKED;
- if (clear_dirty)
+ if (op & EXTENT_CLEAR_DIRTY)
clear_bits |= EXTENT_DIRTY;
- if (clear_delalloc)
+ if (op & EXTENT_CLEAR_DELALLOC)
clear_bits |= EXTENT_DELALLOC;
+ if (op & EXTENT_CLEAR_ACCOUNTING)
+ clear_bits |= EXTENT_DO_ACCOUNTING;
+
clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS);
- if (!(unlock_pages || clear_dirty || set_writeback || end_writeback ||
- set_private2))
+ if (!(op & (EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY |
+ EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK |
+ EXTENT_SET_PRIVATE2)))
return 0;
while (nr_pages > 0) {
@@ -1389,20 +1436,20 @@ int extent_clear_unlock_delalloc(struct inode *inode,
nr_pages, ARRAY_SIZE(pages)), pages);
for (i = 0; i < ret; i++) {
- if (set_private2)
+ if (op & EXTENT_SET_PRIVATE2)
SetPagePrivate2(pages[i]);
if (pages[i] == locked_page) {
page_cache_release(pages[i]);
continue;
}
- if (clear_dirty)
+ if (op & EXTENT_CLEAR_DIRTY)
clear_page_dirty_for_io(pages[i]);
- if (set_writeback)
+ if (op & EXTENT_SET_WRITEBACK)
set_page_writeback(pages[i]);
- if (end_writeback)
+ if (op & EXTENT_END_WRITEBACK)
end_page_writeback(pages[i]);
- if (unlock_pages)
+ if (op & EXTENT_CLEAR_UNLOCK_PAGE)
unlock_page(pages[i]);
page_cache_release(pages[i]);
}
@@ -2668,7 +2715,8 @@ int extent_invalidatepage(struct extent_io_tree *tree,
lock_extent(tree, start, end, GFP_NOFS);
wait_on_page_writeback(page);
clear_extent_bit(tree, start, end,
- EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC,
+ EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING,
1, 1, NULL, GFP_NOFS);
return 0;
}