6.12-stable review patch. If anyone has any objections, please let me know.
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From: Davidlohr Bueso dave@stgolabs.net
[ Upstream commit 5b67d43976828dea2394eae2556b369bb7a61f64 ]
Convert to the new nonatomic flavor to benefit from potential performance benefits and adapt in the future vs migration such that semantics are kept.
Convert write_boundary_block() which already takes the buffer lock as well as bdev_getblk() depending on the respective gpf flags. There are no changes in semantics.
Suggested-by: Jan Kara jack@suse.cz Reviewed-by: Jan Kara jack@suse.cz Signed-off-by: Davidlohr Bueso dave@stgolabs.net Link: https://kdevops.org/ext4/v6.15-rc2.html # [0] Link: https://lore.kernel.org/all/aAAEvcrmREWa1SKF@bombadil.infradead.org/ # [1] Link: https://lore.kernel.org/20250418015921.132400-4-dave@stgolabs.net Tested-by: kdevops@lists.linux.dev # [0] [1] Reviewed-by: Luis Chamberlain mcgrof@kernel.org Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/buffer.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c index b04705eb6cc57..e9e84512a027a 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -658,7 +658,9 @@ EXPORT_SYMBOL(generic_buffers_fsync); void write_boundary_block(struct block_device *bdev, sector_t bblock, unsigned blocksize) { - struct buffer_head *bh = __find_get_block(bdev, bblock + 1, blocksize); + struct buffer_head *bh; + + bh = __find_get_block_nonatomic(bdev, bblock + 1, blocksize); if (bh) { if (buffer_dirty(bh)) write_dirty_buffer(bh, 0); @@ -1446,7 +1448,12 @@ EXPORT_SYMBOL(__find_get_block_nonatomic); struct buffer_head *bdev_getblk(struct block_device *bdev, sector_t block, unsigned size, gfp_t gfp) { - struct buffer_head *bh = __find_get_block(bdev, block, size); + struct buffer_head *bh; + + if (gfpflags_allow_blocking(gfp)) + bh = __find_get_block_nonatomic(bdev, block, size); + else + bh = __find_get_block(bdev, block, size);
might_alloc(gfp); if (bh)