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btrfs: rename btrfs_folio_(set|start|end)_writer_lock()

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Since there is no user of reader locks, rename the writer locks into a
more generic name, by removing the "_writer" part from the name.

And also rename btrfs_subpage::writer into btrfs_subpage::locked.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2024-10-09 16:21:07 +10:30 committed by David Sterba
parent 336e69f302
commit 0f71202665
4 changed files with 43 additions and 39 deletions
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2
fs/btrfs/compression.c
View File

@ -545,7 +545,7 @@ static noinline int add_ra_bio_pages(struct inode *inode,
* subpage::readers and to unlock the page.
*/
if (fs_info->sectorsize < PAGE_SIZE)
btrfs_folio_set_writer_lock(fs_info, folio, cur, add_size);
btrfs_folio_set_lock(fs_info, folio, cur, add_size);
folio_put(folio);
cur += add_size;
}

14
fs/btrfs/extent_io.c
View File

@ -190,7 +190,7 @@ static void process_one_folio(struct btrfs_fs_info *fs_info,
btrfs_folio_clamp_clear_writeback(fs_info, folio, start, len);
if (folio != locked_folio && (page_ops & PAGE_UNLOCK))
btrfs_folio_end_writer_lock(fs_info, folio, start, len);
btrfs_folio_end_lock(fs_info, folio, start, len);
}
static void __process_folios_contig(struct address_space *mapping,
@ -276,7 +276,7 @@ static noinline int lock_delalloc_folios(struct inode *inode,
range_start = max_t(u64, folio_pos(folio), start);
range_len = min_t(u64, folio_pos(folio) + folio_size(folio),
end + 1) - range_start;
btrfs_folio_set_writer_lock(fs_info, folio, range_start, range_len);
btrfs_folio_set_lock(fs_info, folio, range_start, range_len);
processed_end = range_start + range_len - 1;
}
@ -438,7 +438,7 @@ static void end_folio_read(struct folio *folio, bool uptodate, u64 start, u32 le
if (!btrfs_is_subpage(fs_info, folio->mapping))
folio_unlock(folio);
else
btrfs_folio_end_writer_lock(fs_info, folio, start, len);
btrfs_folio_end_lock(fs_info, folio, start, len);
}
/*
@ -495,7 +495,7 @@ static void begin_folio_read(struct btrfs_fs_info *fs_info, struct folio *folio)
return;
ASSERT(folio_test_private(folio));
btrfs_folio_set_writer_lock(fs_info, folio, folio_pos(folio), PAGE_SIZE);
btrfs_folio_set_lock(fs_info, folio, folio_pos(folio), PAGE_SIZE);
}
/*
@ -1184,7 +1184,7 @@ static noinline_for_stack int writepage_delalloc(struct btrfs_inode *inode,
for_each_set_bit(bit, &bio_ctrl->submit_bitmap, fs_info->sectors_per_page) {
u64 start = page_start + (bit << fs_info->sectorsize_bits);
btrfs_folio_set_writer_lock(fs_info, folio, start, fs_info->sectorsize);
btrfs_folio_set_lock(fs_info, folio, start, fs_info->sectorsize);
}
/* Lock all (subpage) delalloc ranges inside the folio first. */
@ -1520,7 +1520,7 @@ done:
* Only unlock ranges that are submitted. As there can be some async
* submitted ranges inside the folio.
*/
btrfs_folio_end_writer_lock_bitmap(fs_info, folio, bio_ctrl->submit_bitmap);
btrfs_folio_end_lock_bitmap(fs_info, folio, bio_ctrl->submit_bitmap);
ASSERT(ret <= 0);
return ret;
}
@ -2298,7 +2298,7 @@ void extent_write_locked_range(struct inode *inode, const struct folio *locked_f
cur, cur_len, !ret);
mapping_set_error(mapping, ret);
}
btrfs_folio_end_writer_lock(fs_info, folio, cur, cur_len);
btrfs_folio_end_lock(fs_info, folio, cur, cur_len);
if (ret < 0)
found_error = true;
next_page:

46
fs/btrfs/subpage.c
View File

@ -143,7 +143,7 @@ struct btrfs_subpage *btrfs_alloc_subpage(const struct btrfs_fs_info *fs_info,
if (type == BTRFS_SUBPAGE_METADATA)
atomic_set(&ret->eb_refs, 0);
else
atomic_set(&ret->writers, 0);
atomic_set(&ret->nr_locked, 0);
return ret;
}
@ -237,8 +237,8 @@ static void btrfs_subpage_clamp_range(struct folio *folio, u64 *start, u32 *len)
orig_start + orig_len) - *start;
}
static bool btrfs_subpage_end_and_test_writer(const struct btrfs_fs_info *fs_info,
struct folio *folio, u64 start, u32 len)
static bool btrfs_subpage_end_and_test_lock(const struct btrfs_fs_info *fs_info,
struct folio *folio, u64 start, u32 len)
{
struct btrfs_subpage *subpage = folio_get_private(folio);
const int start_bit = subpage_calc_start_bit(fs_info, folio, locked, start, len);
@ -256,9 +256,9 @@ static bool btrfs_subpage_end_and_test_writer(const struct btrfs_fs_info *fs_inf
* extent_clear_unlock_delalloc() for compression path.
*
* This @locked_page is locked by plain lock_page(), thus its
* subpage::writers is 0. Handle them in a special way.
* subpage::locked is 0. Handle them in a special way.
*/
if (atomic_read(&subpage->writers) == 0) {
if (atomic_read(&subpage->nr_locked) == 0) {
spin_unlock_irqrestore(&subpage->lock, flags);
return true;
}
@ -267,8 +267,8 @@ static bool btrfs_subpage_end_and_test_writer(const struct btrfs_fs_info *fs_inf
clear_bit(bit, subpage->bitmaps);
cleared++;
}
ASSERT(atomic_read(&subpage->writers) >= cleared);
last = atomic_sub_and_test(cleared, &subpage->writers);
ASSERT(atomic_read(&subpage->nr_locked) >= cleared);
last = atomic_sub_and_test(cleared, &subpage->nr_locked);
spin_unlock_irqrestore(&subpage->lock, flags);
return last;
}
@ -289,8 +289,8 @@ static bool btrfs_subpage_end_and_test_writer(const struct btrfs_fs_info *fs_inf
* bitmap, reduce the writer lock number, and unlock the page if that's
* the last locked range.
*/
void btrfs_folio_end_writer_lock(const struct btrfs_fs_info *fs_info,
struct folio *folio, u64 start, u32 len)
void btrfs_folio_end_lock(const struct btrfs_fs_info *fs_info,
struct folio *folio, u64 start, u32 len)
{
struct btrfs_subpage *subpage = folio_get_private(folio);
@ -303,24 +303,24 @@ void btrfs_folio_end_writer_lock(const struct btrfs_fs_info *fs_info,
/*
* For subpage case, there are two types of locked page. With or
* without writers number.
* without locked number.
*
* Since we own the page lock, no one else could touch subpage::writers
* Since we own the page lock, no one else could touch subpage::locked
* and we are safe to do several atomic operations without spinlock.
*/
if (atomic_read(&subpage->writers) == 0) {
/* No writers, locked by plain lock_page(). */
if (atomic_read(&subpage->nr_locked) == 0) {
/* No subpage lock, locked by plain lock_page(). */
folio_unlock(folio);
return;
}
btrfs_subpage_clamp_range(folio, &start, &len);
if (btrfs_subpage_end_and_test_writer(fs_info, folio, start, len))
if (btrfs_subpage_end_and_test_lock(fs_info, folio, start, len))
folio_unlock(folio);
}
void btrfs_folio_end_writer_lock_bitmap(const struct btrfs_fs_info *fs_info,
struct folio *folio, unsigned long bitmap)
void btrfs_folio_end_lock_bitmap(const struct btrfs_fs_info *fs_info,
struct folio *folio, unsigned long bitmap)
{
struct btrfs_subpage *subpage = folio_get_private(folio);
const int start_bit = fs_info->sectors_per_page * btrfs_bitmap_nr_locked;
@ -334,8 +334,8 @@ void btrfs_folio_end_writer_lock_bitmap(const struct btrfs_fs_info *fs_info,
return;
}
if (atomic_read(&subpage->writers) == 0) {
/* No writers, locked by plain lock_page(). */
if (atomic_read(&subpage->nr_locked) == 0) {
/* No subpage lock, locked by plain lock_page(). */
folio_unlock(folio);
return;
}
@ -345,8 +345,8 @@ void btrfs_folio_end_writer_lock_bitmap(const struct btrfs_fs_info *fs_info,
if (test_and_clear_bit(bit + start_bit, subpage->bitmaps))
cleared++;
}
ASSERT(atomic_read(&subpage->writers) >= cleared);
last = atomic_sub_and_test(cleared, &subpage->writers);
ASSERT(atomic_read(&subpage->nr_locked) >= cleared);
last = atomic_sub_and_test(cleared, &subpage->nr_locked);
spin_unlock_irqrestore(&subpage->lock, flags);
if (last)
folio_unlock(folio);
@ -671,8 +671,8 @@ void btrfs_folio_assert_not_dirty(const struct btrfs_fs_info *fs_info,
* This populates the involved subpage ranges so that subpage helpers can
* properly unlock them.
*/
void btrfs_folio_set_writer_lock(const struct btrfs_fs_info *fs_info,
struct folio *folio, u64 start, u32 len)
void btrfs_folio_set_lock(const struct btrfs_fs_info *fs_info,
struct folio *folio, u64 start, u32 len)
{
struct btrfs_subpage *subpage;
unsigned long flags;
@ -691,7 +691,7 @@ void btrfs_folio_set_writer_lock(const struct btrfs_fs_info *fs_info,
/* Target range should not yet be locked. */
ASSERT(bitmap_test_range_all_zero(subpage->bitmaps, start_bit, nbits));
bitmap_set(subpage->bitmaps, start_bit, nbits);
ret = atomic_add_return(nbits, &subpage->writers);
ret = atomic_add_return(nbits, &subpage->nr_locked);
ASSERT(ret <= fs_info->sectors_per_page);
spin_unlock_irqrestore(&subpage->lock, flags);
}

20
fs/btrfs/subpage.h
View File

@ -54,8 +54,12 @@ struct btrfs_subpage {
*/
atomic_t eb_refs;
/* Structures only used by data */
atomic_t writers;
/*
* Structures only used by data,
*
* How many sectors inside the page is locked.
*/
atomic_t nr_locked;
};
unsigned long bitmaps[];
};
@ -87,12 +91,12 @@ void btrfs_free_subpage(struct btrfs_subpage *subpage);
void btrfs_folio_inc_eb_refs(const struct btrfs_fs_info *fs_info, struct folio *folio);
void btrfs_folio_dec_eb_refs(const struct btrfs_fs_info *fs_info, struct folio *folio);
void btrfs_folio_end_writer_lock(const struct btrfs_fs_info *fs_info,
struct folio *folio, u64 start, u32 len);
void btrfs_folio_set_writer_lock(const struct btrfs_fs_info *fs_info,
struct folio *folio, u64 start, u32 len);
void btrfs_folio_end_writer_lock_bitmap(const struct btrfs_fs_info *fs_info,
struct folio *folio, unsigned long bitmap);
void btrfs_folio_end_lock(const struct btrfs_fs_info *fs_info,
struct folio *folio, u64 start, u32 len);
void btrfs_folio_set_lock(const struct btrfs_fs_info *fs_info,
struct folio *folio, u64 start, u32 len);
void btrfs_folio_end_lock_bitmap(const struct btrfs_fs_info *fs_info,
struct folio *folio, unsigned long bitmap);
/*
* Template for subpage related operations.
*