xfs: remove xfile_stat

vfs_getattr is needed to query inode attributes for unknown underlying
file systems.  But shmemfs is well known for users of shmem_file_setup
and shmem_read_mapping_page_gfp that rely on it not needing specific
inode revalidation and having a normal mapping.  Remove the detour
through the getattr method and an extra wrapper, and just read the
inode size and i_bytes directly in the scrub tracing code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

fs/xfs/scrub/trace.h

@@ -861,18 +861,11 @@ TRACE_EVENT(xfile_destroy,
 		__field(loff_t, size)
 	),
 	TP_fast_assign(
-		struct xfile_stat	statbuf;
-		int			ret;
-
-		ret = xfile_stat(xf, &statbuf);
-		if (!ret) {
-			__entry->bytes = statbuf.bytes;
-			__entry->size = statbuf.size;
-		} else {
-			__entry->bytes = -1;
-			__entry->size = -1;
-		}
-		__entry->ino = file_inode(xf->file)->i_ino;
+		struct inode		*inode = file_inode(xf->file);
+
+		__entry->ino = inode->i_ino;
+		__entry->bytes = inode->i_blocks << SECTOR_SHIFT;
+		__entry->size = i_size_read(inode);
 	),
 	TP_printk("xfino 0x%lx mem_bytes 0x%llx isize 0x%llx",
 		  __entry->ino,
@@ -891,19 +884,12 @@ DECLARE_EVENT_CLASS(xfile_class,
 		__field(unsigned long long, bytecount)
 	),
 	TP_fast_assign(
-		struct xfile_stat	statbuf;
-		int			ret;
-
-		ret = xfile_stat(xf, &statbuf);
-		if (!ret) {
-			__entry->bytes_used = statbuf.bytes;
-			__entry->size = statbuf.size;
-		} else {
-			__entry->bytes_used = -1;
-			__entry->size = -1;
-		}
-		__entry->ino = file_inode(xf->file)->i_ino;
+		struct inode		*inode = file_inode(xf->file);
+
+		__entry->ino = inode->i_ino;
+		__entry->bytes_used = inode->i_blocks << SECTOR_SHIFT;
 		__entry->pos = pos;
+		__entry->size = i_size_read(inode);
 		__entry->bytecount = bytecount;
 	),
 	TP_printk("xfino 0x%lx mem_bytes 0x%llx pos 0x%llx bytecount 0x%llx isize 0x%llx",

fs/xfs/scrub/xfile.c

@@ -274,25 +274,6 @@ xfile_seek_data(
 	return ret;
 }
 
-/* Query stat information for an xfile. */
-int
-xfile_stat(
-	struct xfile		*xf,
-	struct xfile_stat	*statbuf)
-{
-	struct kstat		ks;
-	int			error;
-
-	error = vfs_getattr_nosec(&xf->file->f_path, &ks,
-			STATX_SIZE | STATX_BLOCKS, AT_STATX_DONT_SYNC);
-	if (error)
-		return error;
-
-	statbuf->size = ks.size;
-	statbuf->bytes = ks.blocks << SECTOR_SHIFT;
-	return 0;
-}
-
 /*
  * Grab the (locked) page for a memory object.  The object cannot span a page
  * boundary.  Returns 0 (and a locked page) if successful, -ENOTBLK if we

fs/xfs/scrub/xfile.h

@@ -63,13 +63,6 @@ xfile_obj_store(struct xfile *xf, const void *buf, size_t count, loff_t pos)
 
 loff_t xfile_seek_data(struct xfile *xf, loff_t pos);
 
-struct xfile_stat {
-	loff_t			size;
-	unsigned long long	bytes;
-};
-
-int xfile_stat(struct xfile *xf, struct xfile_stat *statbuf);
-
 int xfile_get_page(struct xfile *xf, loff_t offset, unsigned int len,
 		struct xfile_page *xbuf);
 int xfile_put_page(struct xfile *xf, struct xfile_page *xbuf);