Now that allocations that are allowed to sleep can't fail,
clear_extent_bit has no more error conditions and we can assume the
return value will be 0 and return void to callers.
Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
---
fs/btrfs/extent_io.c | 126 +++++++++++++++++++++++++++++----------------------
fs/btrfs/extent_io.h | 28 +++++------
2 files changed, 88 insertions(+), 66 deletions(-)
Index: linux-3.0-SLE11-SP2/fs/btrfs/extent_io.c
===================================================================
--- linux-3.0-SLE11-SP2.orig/fs/btrfs/extent_io.c 2011-11-21 14:15:28.000000000 -0500
+++ linux-3.0-SLE11-SP2/fs/btrfs/extent_io.c 2011-11-21 14:22:41.000000000 -0500
@@ -494,10 +494,9 @@ NORET_TYPE void extent_io_tree_panic(str
* This takes the tree lock, and returns 0 on success and < 0 on error.
* If (mask & __GFP_WAIT) == 0, there are no error conditions.
*/
-int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- int bits, int wake, int delete,
- struct extent_state **cached_state,
- gfp_t mask)
+static int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ int bits, int wake, int delete,
+ struct extent_state **cached_state, gfp_t mask)
{
struct extent_state *state;
struct extent_state *cached;
@@ -642,6 +641,31 @@ search_again:
goto again;
}
+/*
+ * With __GFP_WAIT set, the memory allocations will wait until they can
+ * be honored. With -ENOMEM out of the way, we don't have errors to return.
+ */
+void clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ int bits, int wake, int delete,
+ struct extent_state **cached_state, gfp_t mask)
+{
+ int ret;
+ WARN_ON(!(mask & __GFP_WAIT));
+ ret = __clear_extent_bit(tree, start, end, bits, wake, delete,
+ cached_state, mask);
+ BUG_ON(ret < 0);
+}
+
+static int __must_check
+clear_extent_bit_atomic(struct extent_io_tree *tree, u64 start,
+ u64 end, int bits, int wake, int delete,
+ struct extent_state **cached_state, gfp_t mask)
+{
+ WARN_ON(mask & __GFP_WAIT);
+ return __clear_extent_bit(tree, start, end, bits, wake, delete,
+ cached_state, mask);
+}
+
static int wait_on_state(struct extent_io_tree *tree,
struct extent_state *state)
__releases(tree->lock)
@@ -1149,10 +1173,10 @@ int set_extent_bits(struct extent_io_tre
NULL, mask);
}
-int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
+void clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
int bits, gfp_t mask)
{
- return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask);
+ clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask);
}
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
@@ -1163,12 +1187,11 @@ int set_extent_delalloc(struct extent_io
0, NULL, cached_state, mask);
}
-int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
+void 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 |
- EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask);
+ clear_extent_bit(tree, start, end, EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask);
}
int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
@@ -1185,12 +1208,12 @@ int set_extent_uptodate(struct extent_io
NULL, cached_state, mask);
}
-static int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
- u64 end, struct extent_state **cached_state,
- gfp_t mask)
+static void clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
+ u64 end, struct extent_state **cached_state,
+ gfp_t mask)
{
- return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
- cached_state, mask);
+ clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
+ cached_state, mask);
}
/*
@@ -1231,9 +1254,19 @@ int try_lock_extent(struct extent_io_tre
err = set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED,
&failed_start, NULL, mask);
if (err == -EEXIST) {
- if (failed_start > start)
- clear_extent_bit(tree, start, failed_start - 1,
- EXTENT_LOCKED, 1, 0, NULL, mask);
+ if (failed_start > start) {
+ if (mask & __GFP_WAIT)
+ clear_extent_bit(tree, start, failed_start - 1,
+ EXTENT_LOCKED, 1, 0, NULL,
+ mask);
+ else {
+ err = clear_extent_bit_atomic(tree, start,
+ failed_start - 1,
+ EXTENT_LOCKED, 1, 0,
+ NULL, mask);
+ BUG_ON(err < 0);
+ }
+ }
return 0;
}
return 1;
@@ -1242,14 +1275,14 @@ int try_lock_extent(struct extent_io_tre
int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state **cached, gfp_t mask)
{
- return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
- mask);
+ return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0,
+ cached, mask);
}
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask)
{
- return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
- mask);
+ return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0,
+ NULL, mask);
}
/*
@@ -1567,10 +1600,10 @@ out_failed:
return found;
}
-int extent_clear_unlock_delalloc(struct inode *inode,
- struct extent_io_tree *tree,
- u64 start, u64 end, struct page *locked_page,
- unsigned long op)
+void extent_clear_unlock_delalloc(struct inode *inode,
+ struct extent_io_tree *tree,
+ u64 start, u64 end, struct page *locked_page,
+ unsigned long op)
{
int ret;
struct page *pages[16];
@@ -1592,7 +1625,7 @@ int extent_clear_unlock_delalloc(struct
if (!(op & (EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY |
EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK |
EXTENT_SET_PRIVATE2)))
- return 0;
+ return;
while (nr_pages > 0) {
ret = find_get_pages_contig(inode->i_mapping, index,
@@ -1621,7 +1654,6 @@ int extent_clear_unlock_delalloc(struct
index += ret;
cond_resched();
}
- return 0;
}
/*
@@ -1858,30 +1890,21 @@ struct io_failure_record {
int in_validation;
};
-static int free_io_failure(struct inode *inode, struct io_failure_record *rec,
+static void free_io_failure(struct inode *inode, struct io_failure_record *rec,
int did_repair)
{
- int ret;
- int err = 0;
struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
set_state_private(failure_tree, rec->start, 0);
- ret = clear_extent_bits(failure_tree, rec->start,
- rec->start + rec->len - 1,
- EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
- if (ret)
- err = ret;
+ clear_extent_bits(failure_tree, rec->start, rec->start + rec->len - 1,
+ EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
- if (did_repair) {
- ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start,
- rec->start + rec->len - 1,
- EXTENT_DAMAGED, GFP_NOFS);
- if (ret && !err)
- err = ret;
- }
+ if (did_repair)
+ clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start,
+ rec->start + rec->len - 1,
+ EXTENT_DAMAGED, GFP_NOFS);
kfree(rec);
- return err;
}
static void repair_io_failure_callback(struct bio *bio, int err)
@@ -2013,7 +2036,7 @@ static int clean_io_failure(u64 start, s
out:
if (!ret)
- ret = free_io_failure(inode, failrec, did_repair);
+ free_io_failure(inode, failrec, did_repair);
return ret;
}
@@ -3284,9 +3307,9 @@ int try_release_extent_state(struct exte
* at this point we can safely clear everything except the
* locked bit and the nodatasum bit
*/
- ret = clear_extent_bit(tree, start, end,
- ~(EXTENT_LOCKED | EXTENT_NODATASUM),
- 0, 0, NULL, mask);
+ ret = __clear_extent_bit(tree, start, end,
+ ~(EXTENT_LOCKED | EXTENT_NODATASUM),
+ 0, 0, NULL, mask);
/* if clear_extent_bit failed for enomem reasons,
* we can't allow the release to continue.
@@ -3868,9 +3891,9 @@ static int eb_straddles_pages(struct ext
return __eb_straddles_pages(eb->start, eb->len);
}
-int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
- struct extent_buffer *eb,
- struct extent_state **cached_state)
+void clear_extent_buffer_uptodate(struct extent_io_tree *tree,
+ struct extent_buffer *eb,
+ struct extent_state **cached_state)
{
unsigned long i;
struct page *page;
@@ -3888,7 +3911,6 @@ int clear_extent_buffer_uptodate(struct
if (page)
ClearPageUptodate(page);
}
- return 0;
}
int set_extent_buffer_uptodate(struct extent_io_tree *tree,
Index: linux-3.0-SLE11-SP2/fs/btrfs/extent_io.h
===================================================================
--- linux-3.0-SLE11-SP2.orig/fs/btrfs/extent_io.h 2011-11-21 14:12:50.000000000 -0500
+++ linux-3.0-SLE11-SP2/fs/btrfs/extent_io.h 2011-11-21 14:21:24.000000000 -0500
@@ -200,11 +200,11 @@ u64 count_range_bits(struct extent_io_tr
void free_extent_state(struct extent_state *state);
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
int bits, int filled, struct extent_state *cached_state);
-int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
- int bits, gfp_t mask);
-int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- int bits, int wake, int delete, struct extent_state **cached,
- gfp_t mask);
+void clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
+ int bits, gfp_t mask);
+void clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ int bits, int wake, int delete,
+ struct extent_state **cached, gfp_t mask);
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
int bits, gfp_t mask);
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
@@ -216,8 +216,8 @@ int set_extent_new(struct extent_io_tree
gfp_t mask);
int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
-int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
- gfp_t mask);
+void clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
+ gfp_t mask);
int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
int bits, int clear_bits, gfp_t mask);
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
@@ -292,9 +292,9 @@ int set_extent_buffer_dirty(struct exten
struct extent_buffer *eb);
int set_extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb);
-int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
- struct extent_buffer *eb,
- struct extent_state **cached_state);
+void clear_extent_buffer_uptodate(struct extent_io_tree *tree,
+ struct extent_buffer *eb,
+ struct extent_state **cached_state);
int extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb,
struct extent_state *cached_state);
@@ -304,10 +304,10 @@ int map_private_extent_buffer(struct ext
unsigned long *map_len);
int extent_range_uptodate(struct extent_io_tree *tree,
u64 start, u64 end);
-int extent_clear_unlock_delalloc(struct inode *inode,
- struct extent_io_tree *tree,
- u64 start, u64 end, struct page *locked_page,
- unsigned long op);
+void extent_clear_unlock_delalloc(struct inode *inode,
+ struct extent_io_tree *tree,
+ u64 start, u64 end, struct page *locked_page,
+ unsigned long op);
struct bio *
btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
gfp_t gfp_flags);
--
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