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| author | Christian Brauner <brauner@kernel.org> | 2026-06-04 11:18:25 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2026-06-04 11:18:25 +0300 |
| commit | 0275dc184aa007b260374af6d46fb15741c062a8 (patch) | |
| tree | 99327f17371a81a2f5feb1c8e194978bfd3bccb0 /include/linux | |
| parent | de5fefadeff3cba9d4df1b0d6fe0518281bbccec (diff) | |
| parent | e1bf79628453e6afac81ffa57f4f40f28e5512ff (diff) | |
| download | linux-0275dc184aa007b260374af6d46fb15741c062a8.tar.xz | |
Merge patch series "mm: improve write performance with RWF_DONTCACHE"
Jeff Layton <jlayton@kernel.org> says:
This patch series is intended to improve write performance with
RWF_DONTCACHE. This version fixes additional stat accounting issues
found during review: integer promotion on 32-bit, cgroup writeback
domain migration, folio split flag preservation, and a UAF that could
occur in filemap_dontcache_kick_writeback().
* patches from https://patch.msgid.link/20260511-dontcache-v7-0-2848ddce8090@kernel.org:
mm: kick writeback flusher for IOCB_DONTCACHE with targeted dirty tracking
mm: track DONTCACHE dirty pages per bdi_writeback
mm: preserve PG_dropbehind flag during folio split
Link: https://patch.msgid.link/20260511-dontcache-v7-0-2848ddce8090@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/backing-dev-defs.h | 3 | ||||
| -rw-r--r-- | include/linux/fs.h | 6 |
2 files changed, 5 insertions, 4 deletions
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h index a06b93446d10..4f1084937315 100644 --- a/include/linux/backing-dev-defs.h +++ b/include/linux/backing-dev-defs.h @@ -26,6 +26,7 @@ enum wb_state { WB_writeback_running, /* Writeback is in progress */ WB_has_dirty_io, /* Dirty inodes on ->b_{dirty|io|more_io} */ WB_start_all, /* nr_pages == 0 (all) work pending */ + WB_start_dontcache, /* dontcache writeback pending */ }; enum wb_stat_item { @@ -33,6 +34,7 @@ enum wb_stat_item { WB_WRITEBACK, WB_DIRTIED, WB_WRITTEN, + WB_DONTCACHE_DIRTY, NR_WB_STAT_ITEMS }; @@ -55,6 +57,7 @@ enum wb_reason { */ WB_REASON_FORKER_THREAD, WB_REASON_FOREIGN_FLUSH, + WB_REASON_DONTCACHE, WB_REASON_MAX, }; diff --git a/include/linux/fs.h b/include/linux/fs.h index 11559c513dfb..df72b42a9e9b 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2624,6 +2624,7 @@ extern int __must_check file_write_and_wait_range(struct file *file, loff_t start, loff_t end); int filemap_flush_range(struct address_space *mapping, loff_t start, loff_t end); +void filemap_dontcache_kick_writeback(struct address_space *mapping); static inline int file_write_and_wait(struct file *file) { @@ -2657,10 +2658,7 @@ static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count) if (ret) return ret; } else if (iocb->ki_flags & IOCB_DONTCACHE) { - struct address_space *mapping = iocb->ki_filp->f_mapping; - - filemap_flush_range(mapping, iocb->ki_pos - count, - iocb->ki_pos - 1); + filemap_dontcache_kick_writeback(iocb->ki_filp->f_mapping); } return count; |