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Tue, 12 Nov 2024 07:24:02 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id +HIVOZICM2esdAAAD6G6ig (envelope-from ) for ; Tue, 12 Nov 2024 07:24:02 +0000 From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH v2 3/3] btrfs: remove the out-of-loop cleanup from btrfs_buffered_write() Date: Tue, 12 Nov 2024 17:53:37 +1030 Message-ID: <05e341dfada9ea89ad578e9d42e5dc495f4556a2.1731396107.git.wqu@suse.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Rspamd-Queue-Id: F149F1F451 X-Spam-Score: -3.01 X-Rspamd-Action: no action X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; 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This allows us to: - Remove @release_bytes completely Now every call site can directly use @pos, @write_bytes (or @copied) at the cleanup helper. - Move @only_release_metadata into the loop Thus making later migration to iomap a little easier. Signed-off-by: Qu Wenruo --- fs/btrfs/file.c | 51 +++++++++++++++++++++++++++++-------------------- 1 file changed, 30 insertions(+), 21 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 5fba2e44c630..5bfa040d3856 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1087,6 +1087,27 @@ int btrfs_write_check(struct kiocb *iocb, size_t count) return 0; } +static void buffered_write_release(struct btrfs_inode *binode, + struct extent_changeset *data_reserved, u64 pos, u64 len, + bool only_release_metadata) +{ + const u32 sectorsize = binode->root->fs_info->sectorsize; + u64 aligned_start; + u64 aligned_len; + + if (!len) + return; + aligned_start = round_down(pos, sectorsize); + aligned_len = round_up(pos + len, sectorsize) - aligned_start; + + if (only_release_metadata) { + btrfs_check_nocow_unlock(binode); + btrfs_delalloc_release_metadata(binode, aligned_len, true); + } else { + btrfs_delalloc_release_space(binode, data_reserved, pos, len, true); + } +} + ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) { struct file *file = iocb->ki_filp; @@ -1094,7 +1115,6 @@ ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) struct inode *inode = file_inode(file); struct btrfs_fs_info *fs_info = inode_to_fs_info(inode); struct extent_changeset *data_reserved = NULL; - u64 release_bytes = 0; u64 lockstart; u64 lockend; size_t num_written = 0; @@ -1103,7 +1123,6 @@ ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) unsigned int ilock_flags = 0; const bool nowait = (iocb->ki_flags & IOCB_NOWAIT); unsigned int bdp_flags = (nowait ? BDP_ASYNC : 0); - bool only_release_metadata = false; const u32 sectorsize = fs_info->sectorsize; if (nowait) @@ -1131,6 +1150,7 @@ ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) struct folio *folio = NULL; int extents_locked; bool force_page_uptodate = false; + bool only_release_metadata = false; /* * Fault pages before locking them in prepare_one_folio() @@ -1145,8 +1165,6 @@ ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) break; } - only_release_metadata = false; - extent_changeset_release(data_reserved); ret = btrfs_check_data_free_space(BTRFS_I(inode), &data_reserved, pos, @@ -1194,11 +1212,12 @@ ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) break; } - release_bytes = reserve_bytes; again: ret = balance_dirty_pages_ratelimited_flags(inode->i_mapping, bdp_flags); if (ret) { btrfs_delalloc_release_extents(BTRFS_I(inode), reserve_bytes); + buffered_write_release(BTRFS_I(inode), data_reserved, + pos, write_bytes, only_release_metadata); break; } @@ -1207,6 +1226,8 @@ ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) if (ret) { btrfs_delalloc_release_extents(BTRFS_I(inode), reserve_bytes); + buffered_write_release(BTRFS_I(inode), data_reserved, + pos, write_bytes, only_release_metadata); break; } @@ -1219,6 +1240,8 @@ ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) btrfs_delalloc_release_extents(BTRFS_I(inode), reserve_bytes); + buffered_write_release(BTRFS_I(inode), data_reserved, + pos, write_bytes, only_release_metadata); ret = extents_locked; break; } @@ -1263,8 +1286,6 @@ ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) } } - release_bytes = dirty_bytes; - ret = btrfs_dirty_folio(BTRFS_I(inode), folio, pos, copied, &cached_state, only_release_metadata); @@ -1284,10 +1305,11 @@ ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) btrfs_delalloc_release_extents(BTRFS_I(inode), reserve_bytes); if (ret) { btrfs_drop_folio(fs_info, folio, pos, copied); + buffered_write_release(BTRFS_I(inode), data_reserved, + pos, copied, only_release_metadata); break; } - release_bytes = 0; if (only_release_metadata) btrfs_check_nocow_unlock(BTRFS_I(inode)); @@ -1299,19 +1321,6 @@ ssize_t btrfs_buffered_write(struct kiocb *iocb, struct iov_iter *i) num_written += copied; } - if (release_bytes) { - if (only_release_metadata) { - btrfs_check_nocow_unlock(BTRFS_I(inode)); - btrfs_delalloc_release_metadata(BTRFS_I(inode), - release_bytes, true); - } else { - btrfs_delalloc_release_space(BTRFS_I(inode), - data_reserved, - round_down(pos, fs_info->sectorsize), - release_bytes, true); - } - } - extent_changeset_free(data_reserved); if (num_written > 0) { pagecache_isize_extended(inode, old_isize, iocb->ki_pos);