[PATCH 7/9] btrfs: drop create parameter to btrfs_get_extent()

Omar Sandoval
2019-12-03T01:34:44Z

From: Omar Sandoval <osandov@fb.com>

We only pass this as 1 from __extent_writepage_io(). The parameter
basically means "pretend I didn't pass in a page". This is silly since
we can simply not pass in the page. Get rid of the parameter from
btrfs_get_extent(), and since it's used as a get_extent_t callback,
remove it from get_extent_t and btree_get_extent(), neither of which
need it.

While we're here, let's document btrfs_get_extent().

Signed-off-by: Omar Sandoval <osandov@fb.com>
---
fs/btrfs/ctree.h | 2 +-
fs/btrfs/disk-io.c | 4 ++--
fs/btrfs/disk-io.h | 4 ++--
fs/btrfs/extent_io.c | 6 +++---
fs/btrfs/extent_io.h | 6 ++----
fs/btrfs/file.c | 17 ++++++++---------
fs/btrfs/inode.c | 41 ++++++++++++++++++++++++-----------------
fs/btrfs/ioctl.c | 2 +-
8 files changed, 43 insertions(+), 39 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 5ad45171e482..7a8209b17b3d 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2875,7 +2875,7 @@ struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
struct btrfs_root *root);
struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
struct page *page, size_t pg_offset,
- u64 start, u64 end, int create);
+ u64 start, u64 end);
int btrfs_update_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index ab888d89d844..881aba162e4e 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -202,8 +202,8 @@ void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
* that covers the entire device
*/
struct extent_map *btree_get_extent(struct btrfs_inode *inode,
- struct page *page, size_t pg_offset, u64 start, u64 len,
- int create)
+ struct page *page, size_t pg_offset,
+ u64 start, u64 len)
{
struct extent_map_tree *em_tree = &inode->extent_tree;
struct extent_map *em;
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 76f123ebb292..8c2d6cf1ce59 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -134,8 +134,8 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
int btree_lock_page_hook(struct page *page, void *data,
void (*flush_fn)(void *));
struct extent_map *btree_get_extent(struct btrfs_inode *inode,
- struct page *page, size_t pg_offset, u64 start, u64 len,
- int create);
+ struct page *page, size_t pg_offset,
+ u64 start, u64 len);
int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
int __init btrfs_end_io_wq_init(void);
void __cold btrfs_end_io_wq_exit(void);
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 635f5d2954a4..13c03c42ba5c 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3043,7 +3043,7 @@ __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset,
*em_cached = NULL;
}

- em = get_extent(BTRFS_I(inode), page, pg_offset, start, len, 0);
+ em = get_extent(BTRFS_I(inode), page, pg_offset, start, len);
if (em_cached && !IS_ERR_OR_NULL(em)) {
BUG_ON(*em_cached);
refcount_inc(&em->refs);
@@ -3466,8 +3466,8 @@ static noinline_for_stack int __extent_writepage_io(struct inode *inode,
page_end, 1);
break;
}
- em = btrfs_get_extent(BTRFS_I(inode), page, pg_offset, cur,
- end - cur + 1, 1);
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, cur,
+ end - cur + 1);
if (IS_ERR_OR_NULL(em)) {
SetPageError(page);
ret = PTR_ERR_OR_ZERO(em);
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index a8551a1f56e2..5d205bbaafdc 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -183,10 +183,8 @@ static inline int extent_compress_type(unsigned long bio_flags)
struct extent_map_tree;

typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
- struct page *page,
- size_t pg_offset,
- u64 start, u64 len,
- int create);
+ struct page *page, size_t pg_offset,
+ u64 start, u64 len);

int try_release_extent_mapping(struct page *page, gfp_t mask);
int try_release_extent_buffer(struct page *page);
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 568b6391c719..c7efc0b04c62 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -477,8 +477,7 @@ static int btrfs_find_new_delalloc_bytes(struct btrfs_inode *inode,
u64 em_len;
int ret = 0;

- em = btrfs_get_extent(inode, NULL, 0, search_start,
- search_len, 0);
+ em = btrfs_get_extent(inode, NULL, 0, search_start, search_len);
if (IS_ERR(em))
return PTR_ERR(em);

@@ -2390,7 +2389,7 @@ static int find_first_non_hole(struct inode *inode, u64 *start, u64 *len)

em = btrfs_get_extent(BTRFS_I(inode), NULL, 0,
round_down(*start, fs_info->sectorsize),
- round_up(*len, fs_info->sectorsize), 0);
+ round_up(*len, fs_info->sectorsize));
if (IS_ERR(em))
return PTR_ERR(em);

@@ -2957,7 +2956,7 @@ static int btrfs_zero_range_check_range_boundary(struct inode *inode,
int ret;

offset = round_down(offset, sectorsize);
- em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize);
if (IS_ERR(em))
return PTR_ERR(em);

@@ -2990,8 +2989,8 @@ static int btrfs_zero_range(struct inode *inode,

inode_dio_wait(inode);

- em = btrfs_get_extent(BTRFS_I(inode), NULL, 0,
- alloc_start, alloc_end - alloc_start, 0);
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, alloc_start,
+ alloc_end - alloc_start);
if (IS_ERR(em)) {
ret = PTR_ERR(em);
goto out;
@@ -3034,8 +3033,8 @@ static int btrfs_zero_range(struct inode *inode,

if (BTRFS_BYTES_TO_BLKS(fs_info, offset) ==
BTRFS_BYTES_TO_BLKS(fs_info, offset + len - 1)) {
- em = btrfs_get_extent(BTRFS_I(inode), NULL, 0,
- alloc_start, sectorsize, 0);
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, alloc_start,
+ sectorsize);
if (IS_ERR(em)) {
ret = PTR_ERR(em);
goto out;
@@ -3273,7 +3272,7 @@ static long btrfs_fallocate(struct file *file, int mode,
INIT_LIST_HEAD(&reserve_list);
while (cur_offset < alloc_end) {
em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, cur_offset,
- alloc_end - cur_offset, 0);
+ alloc_end - cur_offset);
if (IS_ERR(em)) {
ret = PTR_ERR(em);
break;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7fe400d18d60..2145543b2425 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4478,7 +4478,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
cur_offset = hole_start;
while (1) {
em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, cur_offset,
- block_end - cur_offset, 0);
+ block_end - cur_offset);
if (IS_ERR(em)) {
err = PTR_ERR(em);
em = NULL;
@@ -6253,18 +6253,27 @@ static noinline int uncompress_inline(struct btrfs_path *path,
return ret;
}

-/*
- * a bit scary, this does extent mapping from logical file offset to the disk.
- * the ugly parts come from merging extents from the disk with the in-ram
- * representation. This gets more complex because of the data=ordered code,
- * where the in-ram extents might be locked pending data=ordered completion.
+/**
+ * btrfs_get_extent - Lookup the first extent overlapping a range in a file.
+ * @inode: File to search in.
+ * @page: Page to read extent data into if the extent is inline.
+ * @pg_offset: Offset into @page to copy to.
+ * @start: File offset.
+ * @len: Length of range starting at @start.
+ *
+ * This returns the first &struct extent_map which overlaps with the given
+ * range, reading it from the B-tree and caching it if necessary. Note that
+ * there may be more extents which overlap the given range after the returned
+ * extent_map.
*
- * This also copies inline extents directly into the page.
+ * If @page is not NULL and the extent is inline, this also reads the extent
+ * data directly into the page and marks the extent up to date in the io_tree.
+ *
+ * Return: ERR_PTR on error, non-NULL extent_map on success.
*/
struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
- struct page *page,
- size_t pg_offset, u64 start, u64 len,
- int create)
+ struct page *page, size_t pg_offset,
+ u64 start, u64 len)
{
struct btrfs_fs_info *fs_info = inode->root->fs_info;
int ret;
@@ -6281,7 +6290,6 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
struct extent_map *em = NULL;
struct extent_map_tree *em_tree = &inode->extent_tree;
struct extent_io_tree *io_tree = &inode->io_tree;
- const bool new_inline = !page || create;

read_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
@@ -6404,8 +6412,7 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
goto insert;
}

- btrfs_extent_item_to_extent_map(inode, path, item,
- new_inline, em);
+ btrfs_extent_item_to_extent_map(inode, path, item, !page, em);

if (extent_type == BTRFS_FILE_EXTENT_REG ||
extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
@@ -6417,7 +6424,7 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
size_t extent_offset;
size_t copy_size;

- if (new_inline)
+ if (!page)
goto out;

size = btrfs_file_extent_ram_bytes(leaf, item);
@@ -6500,7 +6507,7 @@ struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
u64 delalloc_end;
int err = 0;

- em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
+ em = btrfs_get_extent(inode, NULL, 0, start, len);
if (IS_ERR(em))
return em;
/*
@@ -7125,7 +7132,7 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
goto err;
}

- em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len);
if (IS_ERR(em)) {
ret = PTR_ERR(em);
goto unlock_err;
@@ -10153,7 +10160,7 @@ static int btrfs_swap_activate(struct swap_info_struct *sis, struct file *file,
struct btrfs_block_group *bg;
u64 len = isize - start;

- em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len);
if (IS_ERR(em)) {
ret = PTR_ERR(em);
goto out;
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a1ee0b775e65..00452b98e9f5 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1122,7 +1122,7 @@ static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)

/* get the big lock and read metadata off disk */
lock_extent_bits(io_tree, start, end, &cached);
- em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len);
unlock_extent_cached(io_tree, start, end, &cached);

if (IS_ERR(em))
--
2.24.0