/* List of inodes in the mounted image */
struct list_head *image_inode_list;
+ /* Original list of streams in the mounted image, linked by
+ * mount_orig_stream_list. */
+ struct list_head orig_stream_list;
+
/* Name and message queue descriptors for message queues between the
* filesystem daemon process and the unmount process. These are used
* when the filesystem is unmounted and the process running
{
static const u16 fds_per_alloc = 8;
static const u16 max_fds = 0xffff;
- int ret;
DEBUG("Allocating fd for stream ID %u from inode %#"PRIx64" "
"(open = %u, allocated = %u)",
DEBUG("Sending unmount request msg");
struct msg_unmount_request msg = {
.hdr = {
- .min_version = WIMLIB_MAKEVERSION(1, 2, 1),
+ .min_version = ((unmount_flags & WIMLIB_UNMOUNT_FLAG_NEW_IMAGE) ?
+ WIMLIB_MAKEVERSION(1, 6, 1) :
+ WIMLIB_MAKEVERSION(1, 2, 1)),
.cur_version = WIMLIB_VERSION_CODE,
.msg_type = MSG_TYPE_UNMOUNT_REQUEST,
.msg_size = sizeof(msg),
return 0;
}
+static void
+release_extra_refcnts(struct wimfs_context *ctx)
+{
+ struct list_head *list = &ctx->orig_stream_list;
+ struct wim_lookup_table *lookup_table = ctx->wim->lookup_table;
+ struct wim_lookup_table_entry *lte, *tmp;
+
+ list_for_each_entry_safe(lte, tmp, list, orig_stream_list)
+ while (lte->out_refcnt--)
+ lte_decrement_refcnt(lte, lookup_table);
+}
+
+/* Moves the currently selected image, which may have been modified, to a new
+ * index, and sets the original index to refer to a reset (unmodified) copy of
+ * the image. */
+static int
+renew_current_image(struct wimfs_context *ctx)
+{
+ WIMStruct *wim = ctx->wim;
+ int ret;
+ int idx = wim->current_image - 1;
+ struct wim_image_metadata *imd = wim->image_metadata[idx];
+ struct wim_image_metadata *replace_imd;
+ struct wim_lookup_table_entry *new_lte;
+
+ if (imd->metadata_lte->resource_location != RESOURCE_IN_WIM) {
+ ERROR("Can't reset modified image that doesn't yet "
+ "exist in the on-disk WIM file!");
+ return WIMLIB_ERR_METADATA_NOT_FOUND;
+ }
+
+ /* Create 'replace_imd' structure to use for the reset original,
+ * unmodified image. */
+ replace_imd = new_image_metadata();
+ if (!replace_imd)
+ return WIMLIB_ERR_NOMEM;
+
+ /* Create new stream reference for the modified image's metadata
+ * resource, which doesn't exist yet. */
+ ret = WIMLIB_ERR_NOMEM;
+ new_lte = new_lookup_table_entry();
+ if (!new_lte)
+ goto err_put_replace_imd;
+ new_lte->flags = WIM_RESHDR_FLAG_METADATA;
+ new_lte->unhashed = 1;
+
+ /* Make the image being moved available at a new index. Increments the
+ * WIM's image count, but does not increment the reference count of the
+ * 'struct image_metadata'. */
+ ret = append_image_metadata(wim, imd);
+ if (ret)
+ goto err_free_new_lte;
+
+ ret = xml_add_image(wim, T(""));
+ if (ret)
+ goto err_undo_append;
+
+ replace_imd->metadata_lte = imd->metadata_lte;
+ imd->metadata_lte = new_lte;
+ wim->image_metadata[idx] = replace_imd;
+ wim->current_image = wim->hdr.image_count;
+ return 0;
+
+err_undo_append:
+ wim->hdr.image_count--;
+err_free_new_lte:
+ free_lookup_table_entry(new_lte);
+err_put_replace_imd:
+ put_image_metadata(replace_imd, NULL);
+ return ret;
+}
+
static int
msg_unmount_request_handler(const void *_msg, void *_handler_ctx)
{
if (wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
if (unmount_flags & WIMLIB_UNMOUNT_FLAG_COMMIT) {
+
+ if (unmount_flags & WIMLIB_UNMOUNT_FLAG_NEW_IMAGE) {
+ ret = renew_current_image(wimfs_ctx);
+ if (ret) {
+ status = ret;
+ goto out;
+ }
+ } else {
+ release_extra_refcnts(wimfs_ctx);
+ }
+ INIT_LIST_HEAD(&wimfs_ctx->orig_stream_list);
+
int write_flags = 0;
if (unmount_flags & WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY)
write_flags |= WIMLIB_WRITE_FLAG_CHECK_INTEGRITY;
}
#endif
- /* Mark dentry tree as modified if read-write mount. */
- if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)
+ /* Assign inode numbers. Also, if a read-write mount was requested,
+ * mark the dentry tree as modified, and add each streams referenced by
+ * files in the image to a list and preemptively double the number of
+ * references to each. The latter is done to allow implementing the
+ * WIMLIB_UNMOUNT_FLAG_NEW_IMAGE semantics. */
+ ctx.next_ino = 1;
+ INIT_LIST_HEAD(&ctx.orig_stream_list);
+ if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
imd->modified = 1;
+ image_for_each_inode(inode, imd) {
+ inode->i_ino = ctx.next_ino++;
+ for (unsigned i = 0; i <= inode->i_num_ads; i++) {
+ struct wim_lookup_table_entry *lte;
+
+ lte = inode_stream_lte(inode, i, wim->lookup_table);
+ if (lte) {
+ lte->orig_stream_list = (struct list_head){NULL, NULL};
+ lte->out_refcnt = 0;
+ }
+ }
+ }
+ image_for_each_inode(inode, imd) {
+ for (unsigned i = 0; i <= inode->i_num_ads; i++) {
+ struct wim_lookup_table_entry *lte;
+
+ lte = inode_stream_lte(inode, i,
+ wim->lookup_table);
+ if (lte) {
+ if (lte->out_refcnt == 0)
+ list_add(<e->orig_stream_list,
+ &ctx.orig_stream_list);
+ lte->out_refcnt += inode->i_nlink;
+ lte->refcnt += inode->i_nlink;
+ }
+ }
+ }
+ } else {
+ image_for_each_inode(inode, imd)
+ inode->i_ino = ctx.next_ino++;
+ }
- /* Resolve the lookup table entries for every inode in the image, and
- * assign inode numbers */
- DEBUG("Resolving lookup table entries and assigning inode numbers");
- ctx.next_ino = 1;
- image_for_each_inode(inode, imd)
- inode->i_ino = ctx.next_ino++;
DEBUG("(next_ino = %"PRIu64")", ctx.next_ino);
DEBUG("Calling fuse_main()");
close_message_queues(&ctx);
}
+ release_extra_refcnts(&ctx);
+
/* Try to delete the staging directory if a deletion wasn't yet
* attempted due to an earlier error */
if (ctx.staging_dir_name)
WIMLIB_UNMOUNT_FLAG_COMMIT |
WIMLIB_UNMOUNT_FLAG_REBUILD |
WIMLIB_UNMOUNT_FLAG_RECOMPRESS |
- WIMLIB_UNMOUNT_FLAG_LAZY))
+ WIMLIB_UNMOUNT_FLAG_LAZY |
+ WIMLIB_UNMOUNT_FLAG_NEW_IMAGE))
return WIMLIB_ERR_INVALID_PARAM;
init_wimfs_context(&wimfs_ctx);
git://wimlib.net / wimlib / blobdiff