From a34847d4b73c3a98b565b1d1cc6e1b70c661e18b Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 2 Dec 2022 14:12:41 +0000 Subject: afs: Don't use folio->private to record partial modification AFS currently uses folio->private to store the range of bytes within a folio that have been modified - the idea being that if we have, say, a 2MiB folio and someone writes a single byte, we only have to write back that single page and not the whole 2MiB folio - thereby saving on network bandwidth. Remove this, at least for now, and accept the extra network load (which doesn't matter in the common case of writing a whole file at a time from beginning to end). This makes folio->private available for netfslib to use. Signed-off-by: David Howells Reviewed-by: Jeff Layton cc: Marc Dionne cc: linux-afs@lists.infradead.org cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org --- fs/afs/internal.h | 56 ------------------------------------------------------- 1 file changed, 56 deletions(-) (limited to 'fs/afs/internal.h') diff --git a/fs/afs/internal.h b/fs/afs/internal.h index b77797559e27..a7c8d1d702ee 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -894,62 +894,6 @@ static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int fl i_size_read(&vnode->netfs.inode), flags); } -/* - * We use folio->private to hold the amount of the folio that we've written to, - * splitting the field into two parts. However, we need to represent a range - * 0...FOLIO_SIZE, so we reduce the resolution if the size of the folio - * exceeds what we can encode. - */ -#ifdef CONFIG_64BIT -#define __AFS_FOLIO_PRIV_MASK 0x7fffffffUL -#define __AFS_FOLIO_PRIV_SHIFT 32 -#define __AFS_FOLIO_PRIV_MMAPPED 0x80000000UL -#else -#define __AFS_FOLIO_PRIV_MASK 0x7fffUL -#define __AFS_FOLIO_PRIV_SHIFT 16 -#define __AFS_FOLIO_PRIV_MMAPPED 0x8000UL -#endif - -static inline unsigned int afs_folio_dirty_resolution(struct folio *folio) -{ - int shift = folio_shift(folio) - (__AFS_FOLIO_PRIV_SHIFT - 1); - return (shift > 0) ? shift : 0; -} - -static inline size_t afs_folio_dirty_from(struct folio *folio, unsigned long priv) -{ - unsigned long x = priv & __AFS_FOLIO_PRIV_MASK; - - /* The lower bound is inclusive */ - return x << afs_folio_dirty_resolution(folio); -} - -static inline size_t afs_folio_dirty_to(struct folio *folio, unsigned long priv) -{ - unsigned long x = (priv >> __AFS_FOLIO_PRIV_SHIFT) & __AFS_FOLIO_PRIV_MASK; - - /* The upper bound is immediately beyond the region */ - return (x + 1) << afs_folio_dirty_resolution(folio); -} - -static inline unsigned long afs_folio_dirty(struct folio *folio, size_t from, size_t to) -{ - unsigned int res = afs_folio_dirty_resolution(folio); - from >>= res; - to = (to - 1) >> res; - return (to << __AFS_FOLIO_PRIV_SHIFT) | from; -} - -static inline unsigned long afs_folio_dirty_mmapped(unsigned long priv) -{ - return priv | __AFS_FOLIO_PRIV_MMAPPED; -} - -static inline bool afs_is_folio_dirty_mmapped(unsigned long priv) -{ - return priv & __AFS_FOLIO_PRIV_MMAPPED; -} - #include /*****************************************************************************/ -- cgit