diff options
Diffstat (limited to 'Documentation/filesystems/locking.rst')
| -rw-r--r-- | Documentation/filesystems/locking.rst | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/Documentation/filesystems/locking.rst b/Documentation/filesystems/locking.rst index dee512efb458..72fa12dabd39 100644 --- a/Documentation/filesystems/locking.rst +++ b/Documentation/filesystems/locking.rst @@ -239,7 +239,7 @@ prototypes:: int (*writepage)(struct page *page, struct writeback_control *wbc); int (*readpage)(struct file *, struct page *); int (*writepages)(struct address_space *, struct writeback_control *); - int (*set_page_dirty)(struct page *page); + bool (*dirty_folio)(struct address_space *, struct folio *folio); void (*readahead)(struct readahead_control *); int (*readpages)(struct file *filp, struct address_space *mapping, struct list_head *pages, unsigned nr_pages); @@ -264,7 +264,7 @@ prototypes:: int (*swap_deactivate)(struct file *); locking rules: - All except set_page_dirty and freepage may block + All except dirty_folio and freepage may block ====================== ======================== ========= =============== ops PageLocked(page) i_rwsem invalidate_lock @@ -272,7 +272,7 @@ ops PageLocked(page) i_rwsem invalidate_lock writepage: yes, unlocks (see below) readpage: yes, unlocks shared writepages: -set_page_dirty no +dirty_folio maybe readahead: yes, unlocks shared readpages: no shared write_begin: locks the page exclusive @@ -361,10 +361,11 @@ If nr_to_write is NULL, all dirty pages must be written. writepages should _only_ write pages which are present on mapping->io_pages. -->set_page_dirty() is called from various places in the kernel -when the target page is marked as needing writeback. It may be called -under spinlock (it cannot block) and is sometimes called with the page -not locked. +->dirty_folio() is called from various places in the kernel when +the target folio is marked as needing writeback. The folio cannot be +truncated because either the caller holds the folio lock, or the caller +has found the folio while holding the page table lock which will block +truncation. ->bmap() is currently used by legacy ioctl() (FIBMAP) provided by some filesystems and by the swapper. The latter will eventually go away. Please, |