fuse: selective attribute invalidation

Only invalidate attributes that the operation might have changed.

Introduce two constants for common combinations of changed attributes:

  FUSE_STATX_MODIFY: file contents are modified but not size

  FUSE_STATX_MODSIZE: size and/or file contents modified

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/fuse/dax.c

@@ -735,7 +735,7 @@ static ssize_t fuse_dax_direct_write(struct kiocb *iocb, struct iov_iter *from)
 	if (ret < 0)
 		return ret;
 
-	fuse_invalidate_attr(inode);
+	fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
 	fuse_write_update_size(inode, iocb->ki_pos);
 	return ret;
 }

fs/fuse/dir.c

@@ -116,7 +116,7 @@ u64 entry_attr_timeout(struct fuse_entry_out *o)
 	return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
 }
 
-static void fuse_invalidate_attr_mask(struct inode *inode, u32 mask)
+void fuse_invalidate_attr_mask(struct inode *inode, u32 mask)
 {
 	set_mask_bits(&get_fuse_inode(inode)->inval_mask, 0, mask);
 }
@@ -756,7 +756,7 @@ static void fuse_update_ctime_in_cache(struct inode *inode)
 
 void fuse_update_ctime(struct inode *inode)
 {
-	fuse_invalidate_attr(inode);
+	fuse_invalidate_attr_mask(inode, STATX_CTIME);
 	fuse_update_ctime_in_cache(inode);
 }
 

fs/fuse/file.c

@@ -211,7 +211,7 @@ void fuse_finish_open(struct inode *inode, struct file *file)
 		i_size_write(inode, 0);
 		spin_unlock(&fi->lock);
 		truncate_pagecache(inode, 0);
-		fuse_invalidate_attr(inode);
+		fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
 		if (fc->writeback_cache)
 			file_update_time(file);
 	} else if (!(ff->open_flags & FOPEN_KEEP_CACHE)) {
@@ -515,7 +515,7 @@ static int fuse_flush(struct file *file, fl_owner_t id)
 	 * enabled, i_blocks from cached attr may not be accurate.
 	 */
 	if (!err && fm->fc->writeback_cache)
-		fuse_invalidate_attr(inode);
+		fuse_invalidate_attr_mask(inode, STATX_BLOCKS);
 	return err;
 }
 
@@ -1266,7 +1266,7 @@ static ssize_t fuse_perform_write(struct kiocb *iocb,
 		fuse_write_update_size(inode, pos);
 
 	clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
-	fuse_invalidate_attr(inode);
+	fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
 
 	return res > 0 ? res : err;
 }
@@ -1556,7 +1556,7 @@ static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from)
 					     FUSE_DIO_WRITE);
 		}
 	}
-	fuse_invalidate_attr(inode);
+	fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
 	if (res > 0)
 		fuse_write_update_size(inode, iocb->ki_pos);
 	inode_unlock(inode);
@@ -1769,7 +1769,7 @@ static void fuse_writepage_end(struct fuse_mount *fm, struct fuse_args *args,
 	 * is enabled, we trust local ctime/mtime.
 	 */
 	if (!fc->writeback_cache)
-		fuse_invalidate_attr(inode);
+		fuse_invalidate_attr_mask(inode, FUSE_STATX_MODIFY);
 	spin_lock(&fi->lock);
 	rb_erase(&wpa->writepages_entry, &fi->writepages);
 	while (wpa->next) {
@@ -2875,7 +2875,7 @@ fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 
 	if (iov_iter_rw(iter) == WRITE) {
 		ret = fuse_direct_io(io, iter, &pos, FUSE_DIO_WRITE);
-		fuse_invalidate_attr(inode);
+		fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
 	} else {
 		ret = __fuse_direct_read(io, iter, &pos);
 	}
@@ -2996,7 +2996,7 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
 	if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_ZERO_RANGE))
 		truncate_pagecache_range(inode, offset, offset + length - 1);
 
-	fuse_invalidate_attr(inode);
+	fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
 
 out:
 	if (!(mode & FALLOC_FL_KEEP_SIZE))
@@ -3109,7 +3109,7 @@ static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in,
 		file_update_time(file_out);
 	}
 
-	fuse_invalidate_attr(inode_out);
+	fuse_invalidate_attr_mask(inode_out, FUSE_STATX_MODSIZE);
 
 	err = outarg.size;
 out:

fs/fuse/fuse_i.h

@@ -1065,7 +1065,15 @@ void fuse_wait_aborted(struct fuse_conn *fc);
 /**
  * Invalidate inode attributes
  */
+
+/* Attributes possibly changed on data modification */
+#define FUSE_STATX_MODIFY	(STATX_MTIME | STATX_CTIME | STATX_BLOCKS)
+
+/* Attributes possibly changed on data and/or size modification */
+#define FUSE_STATX_MODSIZE	(FUSE_STATX_MODIFY | STATX_SIZE)
+
 void fuse_invalidate_attr(struct inode *inode);
+void fuse_invalidate_attr_mask(struct inode *inode, u32 mask);
 
 void fuse_invalidate_entry_cache(struct dentry *entry);