16  * XFS Blob Storage
25 	uint32_t		xb_size;   /* size of the blob, in bytes */
27 	/* blob comes after here */
30 /* Initialize a blob storage object. */
36 	struct xfblob		*blob;  in xfblob_create()  local
44 	blob = kmalloc(sizeof(struct xfblob), XCHK_GFP_FLAGS);  in xfblob_create()
45 	if (!blob) {  in xfblob_create()
50 	blob->xfile = xfile;  in xfblob_create()
51 	blob->last_offset = PAGE_SIZE;  in xfblob_create()
53 	*blobp = blob;  in xfblob_create()
61 /* Destroy a blob storage object. */
64 	struct xfblob	*blob)  in xfblob_destroy()  argument
66 	xfile_destroy(blob->xfile);  in xfblob_destroy()
67 	kfree(blob);  in xfblob_destroy()
70 /* Retrieve a blob. */
73 	struct xfblob	*blob,  in xfblob_load()  argument
81 	error = xfile_load(blob->xfile, &key, sizeof(key), cookie);  in xfblob_load()
94 	return xfile_load(blob->xfile, ptr, key.xb_size,  in xfblob_load()
98 /* Store a blob. */
101 	struct xfblob	*blob,  in xfblob_store()  argument
107 		.xb_offset = blob->last_offset,  in xfblob_store()
111 	loff_t		pos = blob->last_offset;  in xfblob_store()
114 	error = xfile_store(blob->xfile, &key, sizeof(key), pos);  in xfblob_store()
119 	error = xfile_store(blob->xfile, ptr, size, pos);  in xfblob_store()
123 	*cookie = blob->last_offset;  in xfblob_store()
124 	blob->last_offset += sizeof(key) + size;  in xfblob_store()
127 	xfile_discard(blob->xfile, blob->last_offset, sizeof(key));  in xfblob_store()
131 /* Free a blob. */
134 	struct xfblob	*blob,  in xfblob_free()  argument
140 	error = xfile_load(blob->xfile, &key, sizeof(key), cookie);  in xfblob_free()
149 	xfile_discard(blob->xfile, cookie, sizeof(key) + key.xb_size);  in xfblob_free()
153 /* How many bytes is this blob storage object consuming? */
156 	struct xfblob		*blob)  in xfblob_bytes()  argument
158 	return xfile_bytes(blob->xfile);  in xfblob_bytes()
164 	struct xfblob	*blob)  in xfblob_truncate()  argument
166 	xfile_discard(blob->xfile, PAGE_SIZE, MAX_LFS_FILESIZE - PAGE_SIZE);  in xfblob_truncate()
167 	blob->last_offset = PAGE_SIZE;  in xfblob_truncate()