#include <fuse.h>
#include <ftw.h>
#include <mqueue.h>
+#include <attr/xattr.h>
+
+struct wimlib_fd {
+ u16 idx;
+ int staging_fd;
+ u64 hard_link_group;
+ struct lookup_table_entry *lte;
+ struct dentry *dentry;
+};
/* The WIMStruct for the mounted WIM. */
static WIMStruct *w;
/* Name of the directory on which the WIM file is mounted. */
static const char *mount_dir;
+/* Next hard link group ID to be assigned. These are also used as the inode
+ * numbers. */
+static u64 next_link_group_id;
+
+/* List of lookup table entries in the staging directory */
+static LIST_HEAD(staging_list);
+
+static inline int get_lookup_flags()
+{
+ if (mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)
+ return LOOKUP_FLAG_ADS_OK;
+ else
+ return 0;
+}
+
+/* Returns nonzero if write permission is requested on the file open flags */
+static inline int flags_writable(int open_flags)
+{
+ return open_flags & (O_RDWR | O_WRONLY);
+}
+
+/*
+ * Allocate a file descriptor for a lookup table entry
+ */
+static int alloc_wimlib_fd(struct lookup_table_entry *lte,
+ struct wimlib_fd **fd_ret)
+{
+ static const u16 fds_per_alloc = 8;
+ static const u16 max_fds = 0xffff;
+
+ if (lte->num_opened_fds == lte->num_allocated_fds) {
+ struct wimlib_fd **fds;
+ u16 num_new_fds;
+
+ if (lte->num_allocated_fds == max_fds)
+ return -EMFILE;
+ num_new_fds = min(fds_per_alloc, max_fds - lte->num_allocated_fds);
+
+ fds = REALLOC(lte->fds, (lte->num_allocated_fds + num_new_fds) *
+ sizeof(lte->fds[0]));
+ if (!fds)
+ return -ENOMEM;
+ memset(&fds[lte->num_allocated_fds], 0,
+ num_new_fds * sizeof(fds[0]));
+ lte->fds = fds;
+ lte->num_allocated_fds += num_new_fds;
+ }
+ for (u16 i = 0; ; i++) {
+ if (!lte->fds[i]) {
+ struct wimlib_fd *fd = CALLOC(1, sizeof(*fd));
+ if (!fd)
+ return -ENOMEM;
+ fd->staging_fd = -1;
+ fd->idx = i;
+ fd->lte = lte;
+ lte->fds[i] = fd;
+ lte->num_opened_fds++;
+ *fd_ret = fd;
+ return 0;
+ }
+ }
+}
+
+static int close_wimlib_fd(struct wimlib_fd *fd)
+{
+ struct lookup_table_entry *lte = fd->lte;
+
+ wimlib_assert(lte);
+ wimlib_assert(lte->num_opened_fds);
+
+ if (lte->resource_location == RESOURCE_IN_STAGING_FILE) {
+ wimlib_assert(lte->staging_file_name);
+ wimlib_assert(fd->staging_fd != -1);
+ if (close(fd->staging_fd) != 0)
+ return -errno;
+ }
+ if (--lte->num_opened_fds == 0 && lte->refcnt == 0) {
+ if (lte->resource_location == RESOURCE_IN_STAGING_FILE) {
+ wimlib_assert(lte->staging_file_name);
+ unlink(lte->staging_file_name);
+ }
+ free_lookup_table_entry(lte);
+ }
+ wimlib_assert(lte->fds[fd->idx] == fd);
+ lte->fds[fd->idx] = NULL;
+ FREE(fd);
+ return 0;
+}
+
+/* Remove a dentry and all its alternate file streams */
+static void remove_dentry(struct dentry *dentry,
+ struct lookup_table *lookup_table)
+{
+ wimlib_assert(dentry);
+ wimlib_assert(dentry->resolved);
+
+ struct lookup_table_entry *lte = dentry->lte;
+ u16 i = 0;
+ while (1) {
+ lte = lte_decrement_refcnt(lte, lookup_table);
+ if (lte && lte->num_opened_fds)
+ for (u16 i = 0; i < lte->num_allocated_fds; i++)
+ if (lte->fds[i] && lte->fds[i]->dentry == dentry)
+ lte->fds[i]->dentry = NULL;
+ if (i == dentry->num_ads)
+ break;
+ lte = dentry->ads_entries[i].lte;
+ i++;
+ }
+
+ unlink_dentry(dentry);
+ put_dentry(dentry);
+}
+
+static void remove_ads(struct dentry *dentry,
+ struct ads_entry *ads_entry,
+ struct lookup_table *lookup_table)
+{
+ struct lookup_table_entry *lte;
+
+ wimlib_assert(dentry->resolved);
+
+ lte = lte_decrement_refcnt(lte, lookup_table);
+ if (lte)
+ list_del(&ads_entry->lte_group_list.list);
+ dentry_remove_ads(dentry, ads_entry);
+}
+
+/* Transfers file attributes from a struct dentry to a `stat' buffer. */
+int dentry_to_stbuf(const struct dentry *dentry, struct stat *stbuf)
+{
+ struct lookup_table_entry *lte;
+
+ if (dentry_is_symlink(dentry))
+ stbuf->st_mode = S_IFLNK | 0777;
+ else if (dentry_is_directory(dentry))
+ stbuf->st_mode = S_IFDIR | 0755;
+ else
+ stbuf->st_mode = S_IFREG | 0644;
+
+ stbuf->st_ino = (ino_t)dentry->hard_link;
+
+ stbuf->st_nlink = dentry_link_group_size(dentry);
+ stbuf->st_uid = getuid();
+ stbuf->st_gid = getgid();
+
+ /* Use the size of the unnamed (default) file stream. */
+ lte = dentry_first_lte_resolved(dentry);
+ if (lte) {
+ if (lte->resource_location == RESOURCE_IN_STAGING_FILE) {
+ wimlib_assert(lte->staging_file_name);
+ struct stat native_stat;
+ if (stat(lte->staging_file_name, &native_stat) != 0) {
+ DEBUG("Failed to stat `%s': %m",
+ lte->staging_file_name);
+ return -errno;
+ }
+ stbuf->st_size = native_stat.st_size;
+ } else {
+ stbuf->st_size = lte->resource_entry.original_size;
+ }
+ } else {
+ stbuf->st_size = 0;
+ }
+
+ stbuf->st_atime = wim_timestamp_to_unix(dentry->last_access_time);
+ stbuf->st_mtime = wim_timestamp_to_unix(dentry->last_write_time);
+ stbuf->st_ctime = wim_timestamp_to_unix(dentry->creation_time);
+ stbuf->st_blocks = (stbuf->st_size + 511) / 512;
+ return 0;
+}
+
+/* Creates a new staging file and returns its file descriptor opened for
+ * writing.
+ *
+ * @name_ret: A location into which the a pointer to the newly allocated name of
+ * the staging file is stored.
+ * @return: The file descriptor for the new file. Returns -1 and sets errno on
+ * error, for any reason possible from the creat() function.
+ */
+static int create_staging_file(char **name_ret, int open_flags)
+{
+ size_t name_len;
+ char *name;
+ struct stat stbuf;
+ int fd;
+ int errno_save;
+
+ name_len = staging_dir_name_len + 1 + SHA1_HASH_SIZE;
+ name = MALLOC(name_len + 1);
+ if (!name) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ do {
+
+ memcpy(name, staging_dir_name, staging_dir_name_len);
+ name[staging_dir_name_len] = '/';
+ randomize_char_array_with_alnum(name + staging_dir_name_len + 1,
+ SHA1_HASH_SIZE);
+ name[name_len] = '\0';
+
+
+ /* Just in case, verify that the randomly generated name doesn't name an
+ * existing file, and try again if so */
+ } while (stat(name, &stbuf) == 0);
+
+ if (errno != ENOENT)
+ /* other error! */
+ return -1;
+
+ /* doesn't exist--- ok */
+
+ DEBUG("Creating staging file `%s'", name);
+
+ fd = open(name, open_flags | O_CREAT | O_TRUNC, 0600);
+ if (fd == -1) {
+ errno_save = errno;
+ FREE(name);
+ errno = errno_save;
+ } else {
+ *name_ret = name;
+ }
+ return fd;
+}
+
+/*
+ * Removes open file descriptors from a lookup table entry @old_lte where the
+ * file descriptors have opened the corresponding file resource in the context
+ * of the hard link group @link_group; these file descriptors are extracted and
+ * placed in a new lookup table entry, which is returned.
+ */
+static struct lookup_table_entry *
+lte_extract_fds(struct lookup_table_entry *old_lte, u64 link_group)
+{
+ int ret;
+ u16 num_transferred_fds;
+ struct lookup_table_entry *new_lte;
+
+ new_lte = new_lookup_table_entry();
+ if (!new_lte)
+ return NULL;
+
+ num_transferred_fds = 0;
+ for (u16 i = 0; i < old_lte->num_allocated_fds; i++)
+ if (old_lte->fds[i] && old_lte->fds[i]->dentry &&
+ old_lte->fds[i]->dentry->hard_link == link_group)
+ num_transferred_fds++;
+ DEBUG("Transferring %u file descriptors",
+ num_transferred_fds);
+ new_lte->fds = MALLOC(num_transferred_fds * sizeof(new_lte->fds[0]));
+ if (!new_lte->fds) {
+ FREE(new_lte);
+ return NULL;
+ }
+ for (u16 i = 0, j = 0; ; i++) {
+ if (old_lte->fds[i] && old_lte->fds[i]->dentry &&
+ old_lte->fds[i]->dentry->hard_link == link_group) {
+ struct wimlib_fd *fd = old_lte->fds[i];
+ old_lte->fds[i] = NULL;
+ fd->lte = new_lte;
+ fd->idx = j;
+ new_lte->fds[j] = fd;
+ if (++j == num_transferred_fds)
+ break;
+ }
+ }
+ DEBUG("old_lte: %u fds open; new_lte: %u fds open",
+ old_lte->num_opened_fds, new_lte->num_opened_fds);
+ old_lte->num_opened_fds -= num_transferred_fds;
+ new_lte->num_opened_fds = num_transferred_fds;
+ new_lte->num_allocated_fds = num_transferred_fds;
+ return new_lte;
+}
+
+/*
+ * Transfers an alternate data stream entry to a new lookup table entry
+ */
+static void lte_transfer_ads_entry(struct lookup_table_entry *new_lte,
+ struct ads_entry *ads_entry)
+{
+ list_del(&ads_entry->lte_group_list.list);
+ list_add(&ads_entry->lte_group_list.list, &new_lte->lte_group_list);
+ ads_entry->lte = new_lte;
+}
+
+/*
+ * Transfers a dentry to a new lookup table entry
+ */
+static void lte_transfer_dentry(struct lookup_table_entry *new_lte,
+ struct dentry *dentry)
+{
+ wimlib_assert(dentry->lte_group_list.list.next);
+ wimlib_assert(new_lte->lte_group_list.next);
+ list_del(&dentry->lte_group_list.list);
+ list_add(&dentry->lte_group_list.list, &new_lte->lte_group_list);
+ dentry->lte = new_lte;
+}
+
+static void lte_transfer_stream_entries(struct lookup_table_entry *new_lte,
+ struct dentry *dentry,
+ unsigned stream_idx)
+{
+ INIT_LIST_HEAD(&new_lte->lte_group_list);
+ if (stream_idx == 0) {
+ struct list_head *pos = &dentry->link_group_list;
+ do {
+ struct dentry *d;
+ d = container_of(pos, struct dentry, link_group_list);
+ wimlib_assert(d->hard_link == dentry->hard_link);
+ lte_transfer_dentry(new_lte, d);
+ pos = pos->next;
+ } while (pos != &dentry->link_group_list);
+ } else {
+ struct ads_entry *ads_entry;
+ wimlib_assert(stream_idx <= dentry->num_ads);
+ ads_entry = &dentry->ads_entries[stream_idx - 1];
+ lte_transfer_ads_entry(new_lte, ads_entry);
+ }
+}
+
+/*
+ * Extract a WIM resource to the staging directory.
+ *
+ * @dentry, @stream_idx: The stream on whose behalf we are modifying the lookup
+ * table entry (these may be more streams than this that reference the lookup
+ * table entry)
+ *
+ * @lte: Pointer to pointer to the lookup table entry for the stream we need to
+ * extract, or NULL if there was no lookup table entry present for the stream
+ *
+ * @size: Number of bytes of the stream we want to extract (this supports the
+ * wimfs_truncate() function).
+ */
+static int extract_resource_to_staging_dir(struct dentry *dentry,
+ unsigned stream_idx,
+ struct lookup_table_entry **lte,
+ off_t size)
+{
+ char *staging_file_name;
+ int ret;
+ int fd;
+ struct lookup_table_entry *old_lte, *new_lte;
+ size_t link_group_size;
+
+ /*
+ * We need to:
+ * - Create a staging file for the WIM resource
+ * - Extract the resource to it
+ * - Create a new lte for the file resource
+ * - Transfer fds from the old lte to the new lte, but only if they share the
+ * same hard link group as this dentry. If there is no old lte, then this
+ * step does not need to be done
+ * - Transfer stream entries from the old lte's list to the new lte's list. If
+ * there is no old lte, we instead transfer entries for the hard link group.
+ *
+ * Note: *lte is permitted to be NULL, in which case there is no old
+ * lookup table entry.
+ */
+
+ DEBUG("Extracting resource `%s' to staging directory", dentry->full_path_utf8);
+
+ old_lte = *lte;
+ fd = create_staging_file(&staging_file_name, O_WRONLY);
+ if (fd == -1)
+ return -errno;
+
+ if (old_lte)
+ ret = extract_wim_resource_to_fd(old_lte, fd, size);
+ else
+ ret = 0;
+ if (ret != 0 || close(fd) != 0) {
+ if (errno != 0)
+ ret = -errno;
+ else
+ ret = -EIO;
+ close(fd);
+ goto out_delete_staging_file;
+ }
+
+ link_group_size = dentry_link_group_size(dentry);
+
+ if (old_lte) {
+ if (link_group_size == old_lte->refcnt) {
+ /* This hard link group is the only user of the lookup
+ * table entry, so we can re-use it. */
+ DEBUG("Re-using lookup table entry");
+ lookup_table_unlink(w->lookup_table, old_lte);
+ new_lte = old_lte;
+ } else {
+ DEBUG("Splitting lookup table entry "
+ "(link_group_size = %u, lte refcnt = %u)",
+ link_group_size, old_lte->refcnt);
+ /* Split a hard link group away from the "lookup table
+ * entry" hard link group (i.e. we had two hard link
+ * groups that were identical, but now we are changing
+ * one of them) */
+
+ /* XXX
+ * The ADS really complicate things here and not
+ * everything is going to work correctly yet. For
+ * example it could be the same that a file contains two
+ * file streams that are identical and therefore share
+ * the same lookup table entry despite the fact that the
+ * streams themselves are not hardlinked.
+ * XXX*/
+ wimlib_assert(old_lte->refcnt > link_group_size);
+
+ new_lte = lte_extract_fds(old_lte, dentry->hard_link);
+ if (!new_lte) {
+ ret = -ENOMEM;
+ goto out_delete_staging_file;
+ }
+
+ lte_transfer_stream_entries(new_lte, dentry, stream_idx);
+ old_lte->refcnt -= link_group_size;
+ }
+ } else {
+ /* No old_lte was supplied, so the resource had no lookup table
+ * entry before (it must be an empty resource) */
+ new_lte = new_lookup_table_entry();
+ if (!new_lte) {
+ ret = -ENOMEM;
+ goto out_delete_staging_file;
+ }
+ lte_transfer_stream_entries(new_lte, dentry, stream_idx);
+ }
+ new_lte->resource_entry.original_size = size;
+ new_lte->refcnt = link_group_size;
+ random_hash(new_lte->hash);
+ if (new_lte->staging_file_name)
+ FREE(new_lte->staging_file_name);
+ new_lte->staging_file_name = staging_file_name;
+ new_lte->resource_location = RESOURCE_IN_STAGING_FILE;
+
+ lookup_table_insert(w->lookup_table, new_lte);
+ list_add(&new_lte->staging_list, &staging_list);
+ *lte = new_lte;
+ return 0;
+out_delete_staging_file:
+ unlink(staging_file_name);
+ FREE(staging_file_name);
+ return ret;
+}
/*
* Creates a randomly named staging directory and returns its name into the
/* Closes the staging file descriptor associated with the lookup table entry, if
* it is opened. */
-static int close_staging_file(struct lookup_table_entry *lte, void *ignore)
+static int close_lte_fds(struct lookup_table_entry *lte)
{
- if (lte->staging_file_name && lte->staging_num_times_opened) {
- if (close(lte->staging_fd) != 0) {
- ERROR_WITH_ERRNO("Failed close file `%s'",
- lte->staging_file_name);
- return WIMLIB_ERR_WRITE;
+ for (u16 i = 0, j = 0; j < lte->num_opened_fds; i++) {
+ if (lte->fds[i] && lte->fds[i]->staging_fd != -1) {
+ wimlib_assert(lte->resource_location == RESOURCE_IN_STAGING_FILE);
+ wimlib_assert(lte->staging_file_name);
+ if (close(lte->fds[i]->staging_fd) != 0) {
+ ERROR_WITH_ERRNO("Failed close file `%s'",
+ lte->staging_file_name);
+ return WIMLIB_ERR_WRITE;
+ }
+ j++;
}
}
return 0;
}
+static void lte_list_change_lte_ptr(struct lookup_table_entry *lte,
+ struct lookup_table_entry *newptr)
+{
+ struct list_head *pos;
+ struct stream_list_head *head;
+ list_for_each(pos, <e->lte_group_list) {
+ head = container_of(pos, struct stream_list_head, list);
+ if (head->type == STREAM_TYPE_ADS) {
+ struct ads_entry *ads_entry;
+ ads_entry = container_of(head, struct ads_entry, lte_group_list);
+
+ ads_entry->lte = newptr;
+ } else {
+ wimlib_assert(head->type == STREAM_TYPE_NORMAL);
+
+ struct dentry *dentry;
+ dentry = container_of(head, struct dentry, lte_group_list);
+
+ dentry->lte = newptr;
+ }
+ }
+}
+
-/* Calculates the SHA1 sum for @dentry if its file resource is in a staging
- * file. Updates the SHA1 sum in the dentry and the lookup table entry. If
- * there is already a lookup table entry with the same checksum, increment its
- * reference count and destroy the lookup entry with the updated checksum. */
-static int calculate_sha1sum_for_staging_file(struct dentry *dentry, void *lookup_table)
+static int update_lte_of_staging_file(struct lookup_table_entry *lte,
+ struct lookup_table *table)
{
- struct lookup_table *table;
- struct lookup_table_entry *lte;
- struct lookup_table_entry *existing;
+ struct lookup_table_entry *duplicate_lte;
int ret;
+ u8 hash[SHA1_HASH_SIZE];
+ struct stat stbuf;
- table = lookup_table;
- lte = lookup_resource(table, dentry->hash);
-
- if (lte && lte->staging_file_name) {
+ wimlib_assert(lte->resource_location == RESOURCE_IN_STAGING_FILE);
+ wimlib_assert(lte->staging_file_name);
- DEBUG("Calculating SHA1 hash for file `%s'",
- dentry->file_name_utf8);
- ret = sha1sum(lte->staging_file_name, dentry->hash);
- if (ret != 0)
- return ret;
+ ret = sha1sum(lte->staging_file_name, hash);
+ if (ret != 0)
+ return ret;
- lookup_table_unlink(table, lte);
- memcpy(lte->hash, dentry->hash, WIM_HASH_SIZE);
- existing = lookup_resource(table, dentry->hash);
- if (existing) {
- DEBUG("Merging duplicate lookup table entries for file "
- "`%s'", dentry->file_name_utf8);
- free_lookup_table_entry(lte);
- existing->refcnt++;
- } else {
- lookup_table_insert(table, lte);
+ lookup_table_unlink(table, lte);
+
+ duplicate_lte = __lookup_resource(table, hash);
+
+ if (duplicate_lte) {
+ /* Merge duplicate lookup table entries */
+
+ lte_list_change_lte_ptr(lte, duplicate_lte);
+ duplicate_lte->refcnt += lte->refcnt;
+ list_splice(<e->lte_group_list,
+ &duplicate_lte->lte_group_list);
+
+ free_lookup_table_entry(lte);
+ } else {
+ if (stat(lte->staging_file_name, &stbuf) != 0) {
+ ERROR_WITH_ERRNO("Failed to stat `%s'", lte->staging_file_name);
+ return WIMLIB_ERR_STAT;
}
+ wimlib_assert(<e->file_on_disk == <e->staging_file_name);
+ lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
+ copy_hash(lte->hash, hash);
+ lte->resource_entry.original_size = stbuf.st_size;
+ lte->resource_entry.size = stbuf.st_size;
+ lookup_table_insert(table, lte);
}
+
return 0;
}
static int rebuild_wim(WIMStruct *w, bool check_integrity)
{
int ret;
- struct dentry *root;
-
- root = wim_root_dentry(w);
+ struct lookup_table_entry *lte, *tmp;
- DEBUG("Closing all staging file descriptors.");
/* Close all the staging file descriptors. */
- ret = for_lookup_table_entry(w->lookup_table, close_staging_file, NULL);
- if (ret != 0) {
- ERROR("Failed to close all staging files");
- return ret;
+ DEBUG("Closing all staging file descriptors.");
+ list_for_each_entry(lte, &staging_list, staging_list) {
+ ret = close_lte_fds(lte);
+ if (ret != 0)
+ return ret;
}
- DEBUG("Calculating SHA1 checksums for all new staging files.");
/* Calculate SHA1 checksums for all staging files, and merge unnecessary
* lookup table entries. */
- ret = for_dentry_in_tree(root, calculate_sha1sum_for_staging_file,
- w->lookup_table);
- if (ret != 0) {
- ERROR("Failed to calculate new SHA1 checksums");
- return ret;
+ DEBUG("Calculating SHA1 checksums for all new staging files.");
+ list_for_each_entry_safe(lte, tmp, &staging_list, staging_list) {
+ ret = update_lte_of_staging_file(lte, w->lookup_table);
+ if (ret != 0)
+ return ret;
}
+ if (ret != 0)
+ return ret;
xml_update_image_info(w, w->current_image);
/* Called when the filesystem is unmounted. */
static void wimfs_destroy(void *p)
{
-
/* For read-write mounts, the `imagex unmount' command, which is
* running in a separate process and is executing the
* wimlib_unmount() function, will send this process a byte
if (status == 0)
status = ret;
}
+ } else {
+ DEBUG("Read-only mount");
}
done:
+ DEBUG("Sending status %u", status);
ret = mq_send(daemon_to_unmount_mq, &status, 1, 1);
if (ret == -1)
ERROR_WITH_ERRNO("Failed to send status to unmount process");
close_message_queues();
}
+static int wimfs_fallocate(const char *path, int mode,
+ off_t offset, off_t len, struct fuse_file_info *fi)
+{
+ struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
+ wimlib_assert(fd->staging_fd != -1);
+ return fallocate(fd->staging_fd, mode, offset, len);
+}
+
+static int wimfs_fgetattr(const char *path, struct stat *stbuf,
+ struct fuse_file_info *fi)
+{
+ struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
+ return dentry_to_stbuf(fd->dentry, stbuf);
+}
+
+static int wimfs_ftruncate(const char *path, off_t size,
+ struct fuse_file_info *fi)
+{
+ struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
+ int ret = ftruncate(fd->staging_fd, size);
+ if (ret != 0)
+ return ret;
+ fd->lte->resource_entry.original_size = size;
+ return 0;
+}
+
/*
* Fills in a `struct stat' that corresponds to a file or directory in the WIM.
*/
static int wimfs_getattr(const char *path, struct stat *stbuf)
{
- struct dentry *dentry = get_dentry(w, path);
+ const char *stream_name;
+ char *p = NULL;
+ struct dentry *dentry;
+ int ret;
+
+ ret = lookup_resource(w, path,
+ get_lookup_flags() | LOOKUP_FLAG_DIRECTORY_OK,
+ &dentry, NULL, NULL);
+ if (ret != 0)
+ return ret;
+ return dentry_to_stbuf(dentry, stbuf);
+}
+
+/* Read an alternate data stream through the XATTR interface, or get its size */
+static int wimfs_getxattr(const char *path, const char *name, char *value,
+ size_t size)
+{
+ int ret;
+ struct dentry *dentry;
+ struct ads_entry *ads_entry;
+ size_t res_size;
+ struct lookup_table_entry *lte;
+
+ if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR))
+ return -ENOTSUP;
+
+ if (memcmp(name, "user.", 5) != 0)
+ return -ENOATTR;
+ name += 5;
+
+ dentry = get_dentry(w, path);
if (!dentry)
return -ENOENT;
- dentry_to_stbuf(dentry, stbuf, w->lookup_table);
- return 0;
+ ads_entry = dentry_get_ads_entry(dentry, name);
+ if (!ads_entry)
+ return -ENOATTR;
+
+ lte = ads_entry->lte;
+ res_size = wim_resource_size(lte);
+
+ if (size == 0)
+ return res_size;
+ if (res_size > size)
+ return -ERANGE;
+ ret = read_full_wim_resource(lte, value);
+ if (ret != 0)
+ return -EIO;
+ return res_size;
}
-/*
- * Create a directory in the WIM.
- * @mode is currently ignored.
- */
-static int wimfs_mkdir(const char *path, mode_t mode)
+/* Create a hard link */
+static int wimfs_link(const char *to, const char *from)
{
- struct dentry *parent;
- struct dentry *newdir;
- const char *basename;
-
- parent = get_parent_dentry(w, path);
- if (!parent)
+ struct dentry *to_dentry, *from_dentry, *from_dentry_parent;
+ const char *link_name;
+
+ to_dentry = get_dentry(w, to);
+ if (!to_dentry)
return -ENOENT;
+ if (!dentry_is_regular_file(to_dentry))
+ return -EPERM;
- if (!dentry_is_directory(parent))
+ from_dentry_parent = get_parent_dentry(w, from);
+ if (!from_dentry_parent)
+ return -ENOENT;
+ if (!dentry_is_directory(from_dentry_parent))
return -ENOTDIR;
- basename = path_basename(path);
- if (get_dentry_child_with_name(parent, basename))
+ link_name = path_basename(from);
+ if (get_dentry_child_with_name(from_dentry_parent, link_name))
return -EEXIST;
+ from_dentry = clone_dentry(to_dentry);
+ if (!from_dentry)
+ return -ENOMEM;
+ if (change_dentry_name(from_dentry, link_name) != 0) {
+ FREE(from_dentry);
+ return -ENOMEM;
+ }
- newdir = new_dentry(basename);
- newdir->attributes |= FILE_ATTRIBUTE_DIRECTORY;
- link_dentry(newdir, parent);
- return 0;
-}
+ /* Add the new dentry to the dentry list for the link group */
+ list_add(&from_dentry->link_group_list, &to_dentry->link_group_list);
-/* Creates a new staging file and returns its file descriptor opened for
- * writing.
- *
- * @name_ret: A location into which the a pointer to the newly allocated name of
- * the staging file is stored.
- * @return: The file descriptor for the new file. Returns -1 and sets errno on
- * error, for any reason possible from the creat() function.
- */
-static int create_staging_file(char **name_ret)
-{
- size_t name_len;
- char *name;
- struct stat stbuf;
- int fd;
- int errno_save;
-
- name_len = staging_dir_name_len + 1 + WIM_HASH_SIZE;
- name = MALLOC(name_len + 1);
- if (!name) {
- errno = ENOMEM;
- return -1;
+ /* Increment reference counts for the unnamed file stream and all
+ * alternate data streams. */
+ if (from_dentry->lte) {
+ list_add(&from_dentry->lte_group_list.list,
+ &to_dentry->lte_group_list.list);
+ from_dentry->lte->refcnt++;
+ }
+ for (u16 i = 0; i < from_dentry->num_ads; i++) {
+ struct ads_entry *ads_entry = &from_dentry->ads_entries[i];
+ if (ads_entry->lte)
+ ads_entry->lte->refcnt++;
}
- memcpy(name, staging_dir_name, staging_dir_name_len);
- name[staging_dir_name_len] = '/';
- randomize_char_array_with_alnum(name + staging_dir_name_len + 1,
- WIM_HASH_SIZE);
- name[name_len] = '\0';
+ /* The ADS entries are owned by another dentry. */
+ from_dentry->ads_entries_status = ADS_ENTRIES_USER;
+ link_dentry(from_dentry, from_dentry_parent);
+ return 0;
+}
- /* Just in case, verify that the randomly generated name doesn't name an
- * existing file, and try again if so */
- if (stat(name, &stbuf) == 0) {
- /* stat succeeded-- the file must exist. Try another name. */
- FREE(name);
- return create_staging_file(name_ret);
- } else {
- if (errno != ENOENT)
- /* other error! */
- return -1;
- /* doesn't exist--- ok */
- }
+static int wimfs_listxattr(const char *path, char *list, size_t size)
+{
+ struct dentry *dentry;
+ int ret;
+ char *p = list;
+ size_t needed_size;
+ unsigned i;
+ if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR))
+ return -ENOTSUP;
- DEBUG("Creating staging file '%s'", name);
+ /* List alternate data streams, or get the list size */
- fd = creat(name, 0600);
- if (fd == -1) {
- errno_save = errno;
- FREE(name);
- errno = errno_save;
+ ret = lookup_resource(w, path, get_lookup_flags(), &dentry, NULL, NULL);
+ if (ret != 0)
+ return ret;
+ if (size == 0) {
+ needed_size = 0;
+ for (i = 0; i < dentry->num_ads; i++)
+ needed_size += dentry->ads_entries[i].stream_name_utf8_len + 6;
+ return needed_size;
} else {
- *name_ret = name;
+ for (i = 0; i < dentry->num_ads; i++) {
+ needed_size = dentry->ads_entries[i].stream_name_utf8_len + 6;
+ if (needed_size > size)
+ return -ERANGE;
+ p += sprintf(p, "user.%s",
+ dentry->ads_entries[i].stream_name_utf8) + 1;
+ size -= needed_size;
+ }
+ return p - list;
}
- return fd;
}
-/* Creates a regular file. This is done in the staging directory. */
-static int wimfs_mknod(const char *path, mode_t mode, dev_t rdev)
+/*
+ * Create a directory in the WIM.
+ * @mode is currently ignored.
+ */
+static int wimfs_mkdir(const char *path, mode_t mode)
{
- struct dentry *parent, *dentry;
+ struct dentry *parent;
+ struct dentry *newdir;
const char *basename;
- struct lookup_table_entry *lte;
- char *tmpfile_name;
- int fd;
- int err;
-
- /* Make sure that the parent of @path exists and is a directory, and
- * that the dentry named by @path does not already exist. */
+
parent = get_parent_dentry(w, path);
if (!parent)
return -ENOENT;
+
if (!dentry_is_directory(parent))
return -ENOTDIR;
+
basename = path_basename(path);
- if (get_dentry_child_with_name(parent, path))
+ if (get_dentry_child_with_name(parent, basename))
return -EEXIST;
- dentry = new_dentry(basename);
-
- /* XXX fill in a temporary random hash value- really should check for
- * duplicates */
- randomize_byte_array(dentry->hash, WIM_HASH_SIZE);
+ newdir = new_dentry(basename);
+ newdir->attributes |= FILE_ATTRIBUTE_DIRECTORY;
+ newdir->resolved = true;
+ newdir->hard_link = next_link_group_id++;
+ link_dentry(newdir, parent);
+ return 0;
+}
- /* Create a lookup table entry having the same hash value */
- lte = new_lookup_table_entry();
- memcpy(lte->hash, dentry->hash, WIM_HASH_SIZE);
- fd = create_staging_file(&tmpfile_name);
+/* Creates a regular file. */
+static int wimfs_mknod(const char *path, mode_t mode, dev_t rdev)
+{
+ const char *stream_name;
+ const char *file_name;
+ if ((mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)
+ && (stream_name = path_stream_name(path))) {
+ /* Make an alternate data stream */
+ struct ads_entry *new_entry;
+ struct dentry *dentry;
+
+ char *p = (char*)stream_name - 1;
+ wimlib_assert(*p == ':');
+ *p = '\0';
+
+ dentry = get_dentry(w, path);
+ if (!dentry || !dentry_is_regular_file(dentry))
+ return -ENOENT;
+ if (dentry_get_ads_entry(dentry, stream_name))
+ return -EEXIST;
+ new_entry = dentry_add_ads(dentry, stream_name);
+ if (!new_entry)
+ return -ENOENT;
+ } else {
+ struct dentry *dentry, *parent;
+ const char *basename;
- if (fd == -1)
- goto mknod_error;
+ /* Make a normal file (not an alternate data stream) */
- if (close(fd) != 0)
- goto mknod_error;
+ /* Make sure that the parent of @path exists and is a directory, and
+ * that the dentry named by @path does not already exist. */
+ parent = get_parent_dentry(w, path);
+ if (!parent)
+ return -ENOENT;
+ if (!dentry_is_directory(parent))
+ return -ENOTDIR;
- lte->staging_file_name = tmpfile_name;
+ basename = path_basename(path);
+ if (get_dentry_child_with_name(parent, path))
+ return -EEXIST;
- /* Insert the lookup table entry, and link the new dentry with its
- * parent. */
- lookup_table_insert(w->lookup_table, lte);
- link_dentry(dentry, parent);
+ dentry = new_dentry(basename);
+ if (!dentry)
+ return -ENOMEM;
+ dentry->resolved = true;
+ dentry->hard_link = next_link_group_id++;
+ dentry->lte_group_list.type = STREAM_TYPE_NORMAL;
+ INIT_LIST_HEAD(&dentry->lte_group_list.list);
+ link_dentry(dentry, parent);
+ }
return 0;
-mknod_error:
- err = errno;
- free_lookup_table_entry(lte);
- return -err;
}
+
/* Open a file. */
static int wimfs_open(const char *path, struct fuse_file_info *fi)
{
struct dentry *dentry;
struct lookup_table_entry *lte;
-
- dentry = get_dentry(w, path);
-
- if (!dentry)
- return -EEXIST;
- if (dentry_is_directory(dentry))
- return -EISDIR;
- lte = wim_lookup_resource(w, dentry);
+ u8 *dentry_hash;
+ int ret;
+ struct wimlib_fd *fd;
+ unsigned stream_idx;
- if (lte) {
- /* If this file is in the staging directory and the file is not
- * currently open, open it. */
- if (lte->staging_file_name && lte->staging_num_times_opened == 0) {
- lte->staging_fd = open(lte->staging_file_name, O_RDWR);
- if (lte->staging_fd == -1)
- return -errno;
- lte->staging_offset = 0;
- }
- } else {
- /* no lookup table entry, so the file must be empty. Create a
- * lookup table entry for the file, unless it's a read-only
- * filesystem. */
- char *tmpfile_name;
- int fd;
+ ret = lookup_resource(w, path, get_lookup_flags(), &dentry, <e,
+ &stream_idx);
+ if (ret != 0)
+ return ret;
- if (!staging_dir_name) /* Read-only filesystem */
+ if (!lte) {
+ /* Empty file with no lookup-table entry. This is fine if it's
+ * a read-only filesystem. Otherwise we need to create a lookup
+ * table entry so that we can keep track of the file descriptors
+ * (this is important in case someone opens the file for
+ * writing) */
+ if (!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)) {
+ fi->fh = 0;
return 0;
+ }
- lte = new_lookup_table_entry();
- if (!lte)
- return -ENOMEM;
+ ret = extract_resource_to_staging_dir(dentry, stream_idx,
+ <e, 0);
+ if (ret != 0)
+ return ret;
+ }
- fd = create_staging_file(&tmpfile_name);
+ ret = alloc_wimlib_fd(lte, &fd);
+ if (ret != 0)
+ return ret;
- if (fd == -1) {
- int err = errno;
- free(lte);
- return -err;
+ fd->dentry = dentry;
+
+ /* The file resource may be in the staging directory (read-write
+ * mounts only) or in the WIM. If it's in the staging
+ * directory, we need to open a native file descriptor for the
+ * corresponding file. Otherwise, we can read the file resource
+ * directly from the WIM file if we are opening it read-only,
+ * but we need to extract the resource to the staging directory
+ * if we are opening it writable. */
+ if (flags_writable(fi->flags) &&
+ lte->resource_location != RESOURCE_IN_STAGING_FILE) {
+ ret = extract_resource_to_staging_dir(dentry, stream_idx, <e,
+ lte->resource_entry.original_size);
+ if (ret != 0)
+ return ret;
+ }
+ if (lte->resource_location == RESOURCE_IN_STAGING_FILE) {
+ fd->staging_fd = open(lte->staging_file_name, fi->flags);
+ if (fd->staging_fd == -1) {
+ close_wimlib_fd(fd);
+ return -errno;
}
- lte->resource_entry.original_size = 0;
- randomize_byte_array(lte->hash, WIM_HASH_SIZE);
- memcpy(dentry->hash, lte->hash, WIM_HASH_SIZE);
- lte->staging_file_name = tmpfile_name;
- lte->staging_fd = fd;
- lte->staging_offset = 0;
- lookup_table_insert(w->lookup_table, lte);
}
- lte->staging_num_times_opened++;
+ fi->fh = (uint64_t)fd;
return 0;
}
struct dentry *dentry;
dentry = get_dentry(w, path);
- if (!dentry || !dentry_is_directory(dentry))
+ if (!dentry)
+ return -ENOENT;
+ if (!dentry_is_directory(dentry))
return -ENOTDIR;
+ dentry->num_times_opened++;
+ fi->fh = (uint64_t)dentry;
return 0;
}
* Read data from a file in the WIM or in the staging directory.
*/
static int wimfs_read(const char *path, char *buf, size_t size,
- off_t offset, struct fuse_file_info *fi)
+ off_t offset, struct fuse_file_info *fi)
{
- struct dentry *dentry;
- struct lookup_table_entry *lte;
-
- dentry = get_dentry(w, path);
-
- if (!dentry)
- return -EEXIST;
+ struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
- if (!dentry_is_regular_file(dentry))
- return -EISDIR;
-
- lte = wim_lookup_resource(w, dentry);
-
- if (!lte)
+ if (!fd) {
+ /* Empty file with no lookup table entry on read-only mounted
+ * WIM */
+ wimlib_assert(!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE));
return 0;
+ }
- if (lte->staging_file_name) {
+ wimlib_assert(fd->lte);
- /* Read from staging */
- int fd;
- off_t cur_offset;
- ssize_t ret;
+ if (fd->lte->resource_location == RESOURCE_IN_STAGING_FILE) {
+ /* Read from staging file */
- if (lte->staging_num_times_opened == 0)
- return -EBADF;
+ wimlib_assert(fd->lte->staging_file_name);
+ wimlib_assert(fd->staging_fd != -1);
- fd = lte->staging_fd;
- cur_offset = lte->staging_offset;
- if (cur_offset != offset)
- if (lseek(fd, offset, SEEK_SET) == -1)
- return -errno;
- lte->staging_offset = offset;
+ ssize_t ret;
+ DEBUG("Seek to offset %zu", offset);
- ret = read(fd, buf, size);
+ if (lseek(fd->staging_fd, offset, SEEK_SET) == -1)
+ return -errno;
+ ret = read(fd->staging_fd, buf, size);
if (ret == -1)
return -errno;
- lte->staging_offset = offset + ret;
-
return ret;
} else {
-
/* Read from WIM */
- struct resource_entry *res_entry;
- int ctype;
+ const struct resource_entry *res_entry;
- res_entry = <e->resource_entry;
-
- ctype = wim_resource_compression_type(w, res_entry);
+ res_entry = &fd->lte->resource_entry;
if (offset > res_entry->original_size)
return -EOVERFLOW;
size = min(size, res_entry->original_size - offset);
- if (read_resource(w->fp, res_entry->size,
- res_entry->original_size,
- res_entry->offset, ctype, size,
- offset, buf) != 0)
+ if (read_wim_resource(fd->lte, buf, size, offset, false) != 0)
return -EIO;
return size;
}
/* Fills in the entries of the directory specified by @path using the
* FUSE-provided function @filler. */
static int wimfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
- off_t offset, struct fuse_file_info *fi)
+ off_t offset, struct fuse_file_info *fi)
{
- struct dentry *parent;
- struct dentry *child;
- struct stat st;
-
- parent = get_dentry(w, path);
-
- if (!parent)
- return -EEXIST;
-
- if (!dentry_is_directory(parent))
- return -ENOTDIR;
+ struct dentry *parent, *child;
+
+ parent = (struct dentry*)fi->fh;
+ wimlib_assert(parent);
+ child = parent->children;
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
- child = parent->children;
-
if (!child)
return 0;
return 0;
}
-/*
- * Find the symlink target of a symbolic link dentry in the WIM.
- *
- * See http://msdn.microsoft.com/en-us/library/cc232006(v=prot.10).aspx
- * Except the first 8 bytes aren't included in the resource (presumably because
- * we already know the reparse tag from the dentry, and we already know the
- * reparse tag len from the lookup table entry resource length).
- */
-static int get_symlink_name(const u8 *resource, size_t resource_len,
- char *buf, size_t buf_len)
-{
- const u8 *p = resource;
- u16 substitute_name_offset;
- u16 substitute_name_len;
- u16 print_name_offset;
- u16 print_name_len;
- u32 flags;
- char *link_target;
- size_t link_target_len;
- int ret;
- if (resource_len < 12)
- return -EIO;
- p = get_u16(p, &substitute_name_offset);
- p = get_u16(p, &substitute_name_len);
- p = get_u16(p, &print_name_offset);
- p = get_u16(p, &print_name_len);
- p = get_u32(p, &flags);
- if (12 + substitute_name_offset + substitute_name_len > resource_len)
- return -EIO;
- link_target = utf16_to_utf8(p + substitute_name_offset,
- substitute_name_len,
- &link_target_len);
- if (!link_target)
- return -EIO;
- if (link_target_len + 1 > buf_len) {
- ret = -ENAMETOOLONG;
- goto out;
- }
- memcpy(buf, link_target, link_target_len + 1);
- ret = 0;
-out:
- free(link_target);
- return ret;
-}
static int wimfs_readlink(const char *path, char *buf, size_t buf_len)
{
struct dentry *dentry = get_dentry(w, path);
- struct ads_entry *ads;
- struct lookup_table_entry *entry;
- struct resource_entry *res_entry;
+ int ret;
if (!dentry)
return -ENOENT;
if (!dentry_is_symlink(dentry))
return -EINVAL;
- /*
- * This is of course not actually documented, but what I think is going
- * on here is that the symlink dentries have 2 alternate data streams;
- * one is the default data stream, which is not used and is empty, and
- * one is the symlink buffer data stream, which is confusingly also
- * unnamed, but isn't empty as it contains the symlink target within the
- * resource.
- */
- if (dentry->num_ads != 2)
- return -EIO;
- if ((entry = lookup_resource(w->lookup_table, dentry->ads_entries[0].hash)))
- goto do_readlink;
- if ((entry = lookup_resource(w->lookup_table, dentry->ads_entries[1].hash)))
- goto do_readlink;
- return -EIO;
-do_readlink:
- res_entry = &entry->resource_entry;
- char res_buf[res_entry->original_size];
- if (read_full_resource(w->fp, res_entry->size,
- res_entry->original_size,
- res_entry->offset,
- wim_resource_compression_type(w, res_entry),
- res_buf) != 0)
- return -EIO;
- return get_symlink_name(res_buf, res_entry->original_size, buf, buf_len);
+ ret = dentry_readlink(dentry, buf, buf_len, w);
+ if (ret > 0)
+ ret = 0;
+ return ret;
}
/* Close a file. */
static int wimfs_release(const char *path, struct fuse_file_info *fi)
{
- struct dentry *dentry;
- struct lookup_table_entry *lte;
int ret;
-
- dentry = get_dentry(w, path);
- if (!dentry)
- return -EEXIST;
- lte = wim_lookup_resource(w, dentry);
+ struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
- if (!lte)
+ if (!fd) {
+ /* Empty file with no lookup table entry on read-only mounted
+ * WIM */
+ wimlib_assert(!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE));
return 0;
-
- if (lte->staging_num_times_opened == 0)
- return -EBADF;
+ }
- if (--lte->staging_num_times_opened == 0 && lte->staging_file_name) {
- ret = close(lte->staging_fd);
- if (ret != 0)
- return -errno;
+ if (flags_writable(fi->flags) && fd->dentry) {
+ u64 now = get_wim_timestamp();
+ fd->dentry->last_access_time = now;
+ fd->dentry->last_write_time = now;
}
+
+ return close_wimlib_fd(fd);
+}
+
+static int wimfs_releasedir(const char *path, struct fuse_file_info *fi)
+{
+ struct dentry *dentry = (struct dentry *)fi->fh;
+
+ wimlib_assert(dentry);
+ wimlib_assert(dentry->num_times_opened);
+ if (--dentry->num_times_opened == 0)
+ free_dentry(dentry);
+ return 0;
+}
+
+/* Remove an alternate data stream through the XATTR interface */
+static int wimfs_removexattr(const char *path, const char *name)
+{
+ struct dentry *dentry;
+ struct ads_entry *ads_entry;
+ int ret;
+ if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR))
+ return -ENOTSUP;
+
+ if (memcmp(name, "user.", 5) != 0)
+ return -ENOATTR;
+ name += 5;
+
+ dentry = get_dentry(w, path);
+ if (!dentry)
+ return -ENOENT;
+
+ ads_entry = dentry_get_ads_entry(dentry, name);
+ if (!ads_entry)
+ return -ENOATTR;
+ remove_ads(dentry, ads_entry, w->lookup_table);
return 0;
}
struct dentry *src;
struct dentry *dst;
struct dentry *parent_of_dst;
+ char *file_name_utf16 = NULL, *file_name_utf8 = NULL;
+ u16 file_name_utf16_len, file_name_utf8_len;
+ int ret;
+
+ /* This rename() implementation currently only supports actual files
+ * (not alternate data streams) */
src = get_dentry(w, from);
if (!src)
dst = get_dentry(w, to);
+
+ ret = get_names(&file_name_utf16, &file_name_utf8,
+ &file_name_utf16_len, &file_name_utf8_len,
+ path_basename(to));
+ if (ret != 0)
+ return -ENOMEM;
+
if (dst) {
+ /* Destination file exists */
+
+ if (src == dst) /* Same file */
+ return 0;
+
if (!dentry_is_directory(src)) {
/* Cannot rename non-directory to directory. */
if (dentry_is_directory(dst))
return -ENOTEMPTY;
}
parent_of_dst = dst->parent;
- unlink_dentry(dst);
- lookup_table_decrement_refcnt(w->lookup_table, dst->hash);
- free_dentry(dst);
+ remove_dentry(dst, w->lookup_table);
} else {
+ /* Destination does not exist */
parent_of_dst = get_parent_dentry(w, to);
if (!parent_of_dst)
return -ENOENT;
+
+ if (!dentry_is_directory(parent_of_dst))
+ return -ENOTDIR;
}
+ FREE(src->file_name);
+ FREE(src->file_name_utf8);
+ src->file_name = file_name_utf16;
+ src->file_name_utf8 = file_name_utf8;
+ src->file_name_len = file_name_utf16_len;
+ src->file_name_utf8_len = file_name_utf8_len;
+
unlink_dentry(src);
- change_dentry_name(src, path_basename(to));
link_dentry(src, parent_of_dst);
- /*calculate_dentry_full_path(src);*/
return 0;
}
dentry = get_dentry(w, path);
if (!dentry)
- return -EEXIST;
+ return -ENOENT;
if (!dentry_is_empty_directory(dentry))
- return -EEXIST;
+ return -ENOTEMPTY;
unlink_dentry(dentry);
- free_dentry(dentry);
+ if (dentry->num_times_opened == 0)
+ free_dentry(dentry);
return 0;
}
-/* Extracts the resource corresponding to @dentry and its lookup table entry
- * @lte to a file in the staging directory. The lookup table entry for @dentry
- * is updated to point to the new file. If @lte has multiple dentries
- * referencing it, a new lookup table entry is created and the hash of @dentry
- * is changed to point to the new lookup table entry.
- *
- * Only @size bytes are extracted, to support truncating the file.
- *
- * Returns the negative error code on failure.
- */
-static int extract_resource_to_staging_dir(struct dentry *dentry,
- struct lookup_table_entry *lte,
- u64 size)
+/* Write an alternate data stream through the XATTR interface */
+static int wimfs_setxattr(const char *path, const char *name,
+ const char *value, size_t size, int flags)
{
+ struct dentry *dentry;
+ struct ads_entry *existing_ads_entry;
+ struct ads_entry *new_ads_entry;
+ struct lookup_table_entry *existing_lte;
+ struct lookup_table_entry *lte;
+ u8 value_hash[SHA1_HASH_SIZE];
+ int ret;
int fd;
- bool ret;
- char *staging_file_name;
- struct lookup_table_entry *new_lte;
- /* File in WIM. Copy it to the staging directory. */
- fd = create_staging_file(&staging_file_name);
- if (fd == -1)
- return -errno;
+ if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR))
+ return -ENOTSUP;
- ret = extract_resource_to_fd(w, <e->resource_entry, fd, size);
- if (ret != 0) {
- if (errno != 0)
- ret = -errno;
- else
- ret = -EIO;
- unlink(staging_file_name);
- FREE(staging_file_name);
- return ret;
+ dentry = get_dentry(w, path);
+ if (!dentry)
+ return -ENOENT;
+ existing_ads_entry = dentry_get_ads_entry(dentry, name);
+ if (existing_ads_entry) {
+ if (flags & XATTR_CREATE)
+ return -EEXIST;
+ remove_ads(dentry, existing_ads_entry, w->lookup_table);
+ } else {
+ if (flags & XATTR_REPLACE)
+ return -ENOATTR;
}
+ new_ads_entry = dentry_add_ads(dentry, name);
+ if (!new_ads_entry)
+ return -ENOMEM;
- if (lte->refcnt != 1) {
- /* Need to make a new lookup table entry if we are
- * changing only one copy of a hardlinked entry */
- lte->refcnt--;
+ sha1_buffer(value, size, value_hash);
- new_lte = new_lookup_table_entry();
- if (!new_lte)
+ existing_lte = __lookup_resource(w->lookup_table, value_hash);
+
+ if (existing_lte) {
+ lte = existing_lte;
+ lte->refcnt++;
+ } else {
+ char *value_copy;
+ lte = new_lookup_table_entry();
+ if (!lte)
return -ENOMEM;
- randomize_byte_array(dentry->hash, WIM_HASH_SIZE);
- memcpy(new_lte->hash, dentry->hash, WIM_HASH_SIZE);
+ value_copy = MALLOC(size);
+ if (!value_copy) {
+ FREE(lte);
+ return -ENOMEM;
+ }
+ lte->resource_location = RESOURCE_IN_ATTACHED_BUFFER;
+ lte->attached_buffer = value_copy;
+ lte->resource_entry.original_size = size;
+ lte->resource_entry.size = size;
+ lte->resource_entry.flags = 0;
+ copy_hash(lte->hash, value_hash);
+ lookup_table_insert(w->lookup_table, lte);
+ }
+ new_ads_entry->lte = lte;
+ return 0;
+}
+
+static int wimfs_symlink(const char *to, const char *from)
+{
+ struct dentry *dentry_parent, *dentry;
+ const char *link_name;
+ struct lookup_table_entry *lte;
+
+ dentry_parent = get_parent_dentry(w, from);
+ if (!dentry_parent)
+ return -ENOENT;
+ if (!dentry_is_directory(dentry_parent))
+ return -ENOTDIR;
- new_lte->resource_entry.flags = 0;
- new_lte->staging_num_times_opened = lte->staging_num_times_opened;
+ link_name = path_basename(from);
- lookup_table_insert(w->lookup_table, new_lte);
+ if (get_dentry_child_with_name(dentry_parent, link_name))
+ return -EEXIST;
+ dentry = new_dentry(link_name);
+ if (!dentry)
+ return -ENOMEM;
- lte = new_lte;
- }
+ dentry->attributes = FILE_ATTRIBUTE_REPARSE_POINT;
+ dentry->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
+ dentry->hard_link = next_link_group_id++;
- lte->resource_entry.original_size = size;
- lte->staging_file_name = staging_file_name;
-
- if (lte->staging_num_times_opened == 0)
- close(fd);
- else
- lte->staging_fd = fd;
+ if (dentry_set_symlink(dentry, to, w->lookup_table, <e) != 0)
+ goto out_free_dentry;
+
+ wimlib_assert(lte);
+
+ dentry->ads_entries[1].lte_group_list.type = STREAM_TYPE_ADS;
+ list_add(&dentry->ads_entries[1].lte_group_list.list,
+ <e->lte_group_list);
+ wimlib_assert(dentry->resolved);
+
+ link_dentry(dentry, dentry_parent);
return 0;
+out_free_dentry:
+ free_dentry(dentry);
+ return -ENOMEM;
}
+
/* Reduce the size of a file */
static int wimfs_truncate(const char *path, off_t size)
{
struct dentry *dentry;
struct lookup_table_entry *lte;
int ret;
+ unsigned stream_idx;
+
+ ret = lookup_resource(w, path, get_lookup_flags(), &dentry,
+ <e, &stream_idx);
- dentry = get_dentry(w, path);
- if (!dentry)
- return -EEXIST;
- lte = wim_lookup_resource(w, dentry);
+ if (ret != 0)
+ return ret;
if (!lte) /* Already a zero-length file */
return 0;
+
if (lte->staging_file_name) {
- /* File on disk. Call POSIX API */
- if (lte->staging_num_times_opened != 0)
- ret = ftruncate(lte->staging_fd, size);
- else
- ret = truncate(lte->staging_file_name, size);
+ ret = truncate(lte->staging_file_name, size);
if (ret != 0)
return -errno;
- dentry_update_all_timestamps(dentry);
lte->resource_entry.original_size = size;
- return 0;
} else {
/* File in WIM. Extract it to the staging directory, but only
* the first @size bytes of it. */
- return extract_resource_to_staging_dir(dentry, lte, size);
+ ret = extract_resource_to_staging_dir(dentry, stream_idx,
+ <e, size);
}
+ dentry_update_all_timestamps(dentry);
+ return ret;
}
/* Remove a regular file */
{
struct dentry *dentry;
struct lookup_table_entry *lte;
+ int ret;
+ u8 *dentry_hash;
+ unsigned stream_idx;
- dentry = get_dentry(w, path);
- if (!dentry)
- return -EEXIST;
+ ret = lookup_resource(w, path, get_lookup_flags(), &dentry,
+ <e, &stream_idx);
- if (!dentry_is_regular_file(dentry))
- return -EEXIST;
+ if (ret != 0)
+ return ret;
- lte = wim_lookup_resource(w, dentry);
- if (lte) {
- if (lte->staging_file_name)
- if (unlink(lte->staging_file_name) != 0)
- return -errno;
- lookup_table_decrement_refcnt(w->lookup_table, dentry->hash);
+ if (stream_idx == 0) {
+ /* We are removing the full dentry including all alternate data
+ * streams. */
+ remove_dentry(dentry, w->lookup_table);
+ } else {
+ /* We are removing an alternate data stream. */
+ remove_ads(dentry, &dentry->ads_entries[stream_idx - 1],
+ w->lookup_table);
}
-
- unlink_dentry(dentry);
- free_dentry(dentry);
+ /* Beware: The lookup table entry(s) may still be referenced by users
+ * that have opened the corresponding streams. They are freed later in
+ * wimfs_release() when the last file user has closed the stream. */
return 0;
}
+/*
+ * Change the timestamp on a file dentry.
+ *
+ * Note that alternate data streams do not have their own timestamps.
+ */
static int wimfs_utimens(const char *path, const struct timespec tv[2])
{
struct dentry *dentry = get_dentry(w, path);
if (!dentry)
return -ENOENT;
- time_t last_access_t = (tv[0].tv_nsec == UTIME_NOW) ?
- time(NULL) : tv[0].tv_sec;
- dentry->last_access_time = unix_timestamp_to_ms(last_access_t);
- time_t last_mod_t = (tv[1].tv_nsec == UTIME_NOW) ?
- time(NULL) : tv[1].tv_sec;
- dentry->last_write_time = unix_timestamp_to_ms(last_mod_t);
+ if (tv[0].tv_nsec != UTIME_OMIT) {
+ if (tv[0].tv_nsec == UTIME_NOW)
+ dentry->last_access_time = get_wim_timestamp();
+ else
+ dentry->last_access_time = timespec_to_wim_timestamp(&tv[0]);
+ }
+ if (tv[1].tv_nsec != UTIME_OMIT) {
+ if (tv[1].tv_nsec == UTIME_NOW)
+ dentry->last_write_time = get_wim_timestamp();
+ else
+ dentry->last_write_time = timespec_to_wim_timestamp(&tv[1]);
+ }
return 0;
}
-/* Writes to a file in the WIM filesystem. */
+/* Writes to a file in the WIM filesystem.
+ * It may be an alternate data stream, but here we don't even notice because we
+ * just get a lookup table entry. */
static int wimfs_write(const char *path, const char *buf, size_t size,
- off_t offset, struct fuse_file_info *fi)
+ off_t offset, struct fuse_file_info *fi)
{
- struct dentry *dentry;
- struct lookup_table_entry *lte;
- ssize_t ret;
-
- dentry = get_dentry(w, path);
- if (!dentry)
- return -EEXIST;
- lte = wim_lookup_resource(w, dentry);
-
- if (!lte) /* this should not happen */
- return -EEXIST;
+ struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
+ int ret;
- if (lte->staging_num_times_opened == 0)
- return -EBADF;
- if (lte->staging_file_name) {
+ wimlib_assert(fd);
+ wimlib_assert(fd->lte);
+ wimlib_assert(fd->lte->staging_file_name);
+ wimlib_assert(fd->staging_fd != -1);
- /* File in staging directory. We can write to it directly. */
+ /* Seek to the requested position */
+ if (lseek(fd->staging_fd, offset, SEEK_SET) == -1)
+ return -errno;
- /* Seek to correct position in file if needed. */
- if (lte->staging_offset != offset) {
- if (lseek(lte->staging_fd, offset, SEEK_SET) == -1)
- return -errno;
- lte->staging_offset = offset;
- }
+ /* Write the data. */
+ ret = write(fd->staging_fd, buf, size);
+ if (ret == -1)
+ return -errno;
- /* Write the data. */
- ret = write(lte->staging_fd, buf, size);
- if (ret == -1)
- return -errno;
+ return ret;
+}
- /* Adjust the stored offset of staging_fd. */
- lte->staging_offset = offset + ret;
+static struct fuse_operations wimfs_operations = {
+ .access = wimfs_access,
+ .destroy = wimfs_destroy,
+ .fallocate = wimfs_fallocate,
+ .fgetattr = wimfs_fgetattr,
+ .ftruncate = wimfs_ftruncate,
+ .getattr = wimfs_getattr,
+ .getxattr = wimfs_getxattr,
+ .link = wimfs_link,
+ .listxattr = wimfs_listxattr,
+ .mkdir = wimfs_mkdir,
+ .mknod = wimfs_mknod,
+ .open = wimfs_open,
+ .opendir = wimfs_opendir,
+ .read = wimfs_read,
+ .readdir = wimfs_readdir,
+ .readlink = wimfs_readlink,
+ .release = wimfs_release,
+ .releasedir = wimfs_releasedir,
+ .removexattr = wimfs_removexattr,
+ .rename = wimfs_rename,
+ .rmdir = wimfs_rmdir,
+ .setxattr = wimfs_setxattr,
+ .symlink = wimfs_symlink,
+ .truncate = wimfs_truncate,
+ .unlink = wimfs_unlink,
+ .utimens = wimfs_utimens,
+ .write = wimfs_write,
+};
- /* Increase file size if needed. */
- if (lte->resource_entry.original_size < lte->staging_offset)
- lte->resource_entry.original_size = lte->staging_offset;
- /* The file has been modified, so all its timestamps must be
- * updated. */
- dentry_update_all_timestamps(dentry);
- return ret;
- } else {
- /* File in the WIM. We must extract it to the staging directory
- * before it can be written to. */
- ret = extract_resource_to_staging_dir(dentry, lte,
- lte->resource_entry.original_size);
- if (ret != 0)
- return ret;
- else
- return wimfs_write(path, buf, size, offset, fi);
+static int check_lte_refcnt(struct lookup_table_entry *lte, void *ignore)
+{
+ size_t lte_group_size = 0;
+ struct list_head *cur;
+ list_for_each(cur, <e->lte_group_list)
+ lte_group_size++;
+ if (lte_group_size > lte->refcnt) {
+#ifdef ENABLE_ERROR_MESSAGES
+ ERROR("The following lookup table entry has a reference count "
+ "of %u, but", lte->refcnt);
+ ERROR("We found %u references to it", lte_group_size);
+ print_lookup_table_entry(lte);
+#endif
+ return WIMLIB_ERR_INVALID_DENTRY;
}
+ return 0;
}
-
-static struct fuse_operations wimfs_oper = {
- .access = wimfs_access,
- .destroy = wimfs_destroy,
- .getattr = wimfs_getattr,
- .mkdir = wimfs_mkdir,
- .mknod = wimfs_mknod,
- .open = wimfs_open,
- .opendir = wimfs_opendir,
- .read = wimfs_read,
- .readdir = wimfs_readdir,
- .readlink = wimfs_readlink,
- .release = wimfs_release,
- .rename = wimfs_rename,
- .rmdir = wimfs_rmdir,
- .truncate = wimfs_truncate,
- .unlink = wimfs_unlink,
- .utimens = wimfs_utimens,
- .write = wimfs_write,
-};
-
-
/* Mounts a WIM file. */
WIMLIBAPI int wimlib_mount(WIMStruct *wim, int image, const char *dir,
int flags)
{
int argc = 0;
- char *argv[6];
+ char *argv[16];
int ret;
char *p;
ret = wimlib_select_image(wim, image);
+ if (ret != 0)
+ return ret;
+
+ DEBUG("Selected image %d", image);
+
+ next_link_group_id = assign_link_groups(wim->image_metadata[image - 1].lgt);
+
+ /* Resolve all the lookup table entries of the dentry tree */
+ for_dentry_in_tree(wim_root_dentry(wim), dentry_resolve_ltes,
+ wim->lookup_table);
+
+ ret = for_lookup_table_entry(wim->lookup_table, check_lte_refcnt, NULL);
if (ret != 0)
return ret;
if (!p)
return WIMLIB_ERR_NOMEM;
- argv[argc++] = "mount";
+ argv[argc++] = "imagex";
argv[argc++] = p;
argv[argc++] = "-s"; /* disable multi-threaded operation */
- if (flags & WIMLIB_MOUNT_FLAG_DEBUG) {
+ if (flags & WIMLIB_MOUNT_FLAG_DEBUG)
argv[argc++] = "-d";
- }
- if (!(flags & WIMLIB_MOUNT_FLAG_READWRITE)) {
- argv[argc++] = "-o";
- argv[argc++] = "ro";
- } else {
+
+ /*
+ * We provide the use_ino option because we are going to assign inode
+ * numbers oursides. We've already numbered the hard link groups with
+ * unique numbers with the assign_link_groups() function, and the static
+ * variable next_link_group_id is set to the next available link group
+ * ID that we will assign to new dentries.
+ */
+ char optstring[256] = "use_ino";
+ argv[argc++] = "-o";
+ argv[argc++] = optstring;
+ if ((flags & WIMLIB_MOUNT_FLAG_READWRITE)) {
+ /* Read-write mount. Make the staging directory */
make_staging_dir();
if (!staging_dir_name) {
FREE(p);
return WIMLIB_ERR_MKDIR;
}
+ } else {
+ /* Read-only mount */
+ strcat(optstring, ",ro");
}
+ argv[argc] = NULL;
#ifdef ENABLE_DEBUG
{
w = wim;
mount_flags = flags;
- ret = fuse_main(argc, argv, &wimfs_oper, NULL);
+ ret = fuse_main(argc, argv, &wimfs_operations, NULL);
return (ret == 0) ? 0 : WIMLIB_ERR_FUSE;
}
* filesystem daemon has crashed or failed for some reason.
*
* XXX come up with some method to determine if the filesystem
- * daemon has really crashed or not. */
+ * daemon has really crashed or not.
+ *
+ * XXX Idea: have mount daemon write its PID into the WIM file header?
+ * */
gettimeofday(&now, NULL);
timeout.tv_sec = now.tv_sec + 600;
git://wimlib.net / wimlib / blobdiff