put_dentry(dentry);
}
-static void dentry_increment_lookup_table_refcnts(struct dentry *dentry,
- struct lookup_table *lookup_table)
+/* Transfers file attributes from a struct dentry to a `stat' buffer. */
+int dentry_to_stbuf(const struct dentry *dentry, struct stat *stbuf)
{
- u16 i = 0;
- const u8 *hash = dentry->hash;
struct lookup_table_entry *lte;
- while (1) {
- lte = __lookup_resource(lookup_table, hash);
- if (lte)
- lte->refcnt++;
- if (i == dentry->num_ads)
- break;
- hash = dentry->ads_entries[i].hash;
- i++;
- }
-}
-/* Change the hash value of the main or alternate file stream in a hard link
- * group. This needs to be done if the hash of the corresponding lookup table
- * entry was changed. */
-static void link_group_set_stream_hash(struct dentry *dentry,
- unsigned stream_idx,
- const u8 new_hash[])
-{
- struct list_head *head, *cur;
+ 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;
- if (stream_idx == 0) {
- head = &dentry->link_group_list;
- cur = head;
- do {
- dentry = container_of(cur, struct dentry, link_group_list);
- memcpy(dentry->hash, new_hash, WIM_HASH_SIZE);
- cur = cur->next;
- } while (cur != head);
+ 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. */
+ if ((lte = dentry_lte(dentry))) {
+ if (lte->staging_file_name) {
+ struct stat native_stat;
+ if (stat(lte->staging_file_name, &native_stat) != 0)
+ return -errno;
+ stbuf->st_size = native_stat.st_size;
+ } else {
+ stbuf->st_size = lte->resource_entry.original_size;
+ }
} else {
- /* Dentries in the link group share their alternate stream
- * entries. */
- wimlib_assert(stream_idx <= dentry->num_ads);
- memcpy(dentry->ads_entries[stream_idx - 1].hash, new_hash,
- WIM_HASH_SIZE);
+ stbuf->st_size = 0;
}
+
+ stbuf->st_atime = ms_timestamp_to_unix(dentry->last_access_time);
+ stbuf->st_mtime = ms_timestamp_to_unix(dentry->last_write_time);
+ stbuf->st_ctime = ms_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
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->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->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;
+ }
+ }
+ 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)
+{
+ 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;
+ do {
+ struct dentry *d;
+ d = container_of(pos, struct dentry, link_group_list);
+ lte_transfer_dentry(new_lte, d);
+
+ pos = pos->next;
+ } while (pos != &dentry->link_group_list);
+ } else {
+ struct ads_entry *ads_entry;
+ ads_entry = &dentry->ads_entries[stream_idx - 1];
+ lte_transfer_ads_entry(new_lte, ads_entry);
+ }
+}
+
/*
* Extract a WIM resource to the staging directory.
*
* - Transfer fds from the old lte to the new lte, but
* only if they share the same hard link group as this
* dentry
+ * - Transfer stream entries from the old lte's list to the new lte's list.
+ *
+ * *lte is permitted to be NULL, in which case there is no old lookup table
+ * entry.
*/
static int extract_resource_to_staging_dir(struct dentry *dentry,
+ unsigned stream_idx,
struct lookup_table_entry **lte,
off_t size)
{
/* 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_remove(w->lookup_table, old_lte);
+ lookup_table_unlink(w->lookup_table, old_lte);
new_lte = old_lte;
} else {
DEBUG("Splitting lookup table entry "
* streams themselves are not hardlinked. */
wimlib_assert(old_lte->refcnt > link_group_size);
- new_lte = new_lookup_table_entry();
+ new_lte = lte_extract_fds(old_lte, dentry->hard_link);
if (!new_lte) {
ret = -ENOMEM;
goto out_delete_staging_file;
}
- u16 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->hard_link ==
- dentry->hard_link)
- {
- 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);
- ret = -ENOMEM;
- goto out_delete_staging_file;
- }
- for (u16 i = 0, j = 0; ; i++) {
- if (old_lte->fds[i] &&
- old_lte->fds[i]->dentry->hard_link ==
- dentry->hard_link)
- {
- 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;
- }
- }
+ lte_transfer_stream_entries(new_lte, dentry, stream_idx);
old_lte->refcnt -= link_group_size;
- old_lte->num_opened_fds -= num_transferred_fds;
- new_lte->num_opened_fds = num_transferred_fds;
- new_lte->num_allocated_fds = num_transferred_fds;
}
} else {
/* No old_lte was supplied, so the resource had no lookup table
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;
return 0;
}
-
-/* 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_of_staging_file(struct dentry *dentry,
- void *__lookup_table)
+static void lte_list_change_lte_ptr(struct lookup_table_entry *lte,
+ struct lookup_table_entry *newptr)
{
- struct lookup_table *lookup_table = __lookup_table;
- u8 *hash = dentry->hash;
- u16 i = 0;
- while (1) {
- struct lookup_table_entry *lte = __lookup_resource(lookup_table, hash);
- if (lte && lte->staging_file_name) {
- struct lookup_table_entry *existing;
- int ret;
-
- DEBUG("Calculating SHA1 hash for file `%s'",
- dentry->file_name_utf8);
- ret = sha1sum(lte->staging_file_name, lte->hash);
- if (ret != 0)
- return ret;
-
- lookup_table_unlink(lookup_table, lte);
- memcpy(hash, lte->hash, WIM_HASH_SIZE);
- existing = __lookup_resource(lookup_table, 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(lookup_table, lte);
- }
+ 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;
}
- if (i == dentry->num_ads)
- break;
- hash = dentry->ads_entries[i].hash;
- i++;
}
+}
+
+
+static int calculate_sha1sum_of_staging_file(struct lookup_table_entry *lte,
+ struct lookup_table *table)
+{
+ struct lookup_table_entry *duplicate_lte;
+ int ret;
+ u8 hash[WIM_HASH_SIZE];
+
+ ret = sha1sum(lte->staging_file_name, hash);
+ if (ret != 0)
+ return ret;
+
+ lookup_table_unlink(table, lte);
+ memcpy(lte->hash, hash, WIM_HASH_SIZE);
+
+ 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(&duplicate_lte->lte_group_list,
+ <e->lte_group_list);
+
+ free_lookup_table_entry(lte);
+ } else {
+ lookup_table_insert(table, lte);
+ }
+
return 0;
}
static int rebuild_wim(WIMStruct *w, bool check_integrity)
{
int ret;
- struct lookup_table_entry *lte;
+ struct lookup_table_entry *lte, *tmp;
/* Close all the staging file descriptors. */
DEBUG("Closing all staging file descriptors.");
/* Calculate SHA1 checksums for all staging files, and merge unnecessary
* lookup table entries. */
DEBUG("Calculating SHA1 checksums for all new staging files.");
- ret = for_dentry_in_tree(wim_root_dentry(w),
- calculate_sha1sum_of_staging_file, w->lookup_table);
+ list_for_each_entry_safe(lte, tmp, &staging_list, staging_list) {
+ ret = calculate_sha1sum_of_staging_file(lte, w->lookup_table);
+ if (ret != 0)
+ return ret;
+ }
if (ret != 0)
return ret;
struct fuse_file_info *fi)
{
struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
- return dentry_to_stbuf(fd->dentry, stbuf, w->lookup_table);
+ return dentry_to_stbuf(fd->dentry, stbuf);
}
static int wimfs_ftruncate(const char *path, off_t size,
struct dentry *dentry = get_dentry(w, path);
if (!dentry)
return -ENOENT;
- return dentry_to_stbuf(dentry, stbuf, w->lookup_table);
+ return dentry_to_stbuf(dentry, stbuf);
}
static int wimfs_getxattr(const char *path, const char *name, char *value,
FREE(from_dentry);
return -ENOMEM;
}
+
+ /* Add the new dentry to the dentry list for the link group */
list_add(&from_dentry->link_group_list, &to_dentry->link_group_list);
- link_dentry(from_dentry, from_dentry_parent);
- dentry_increment_lookup_table_refcnts(from_dentry, w->lookup_table);
+
+ /* 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++;
+ }
+
+ /* The ADS entries are owned by another dentry. */
from_dentry->link_group_master_status = GROUP_SLAVE;
+
+ link_dentry(from_dentry, from_dentry_parent);
return 0;
}
const char *stream_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;
struct dentry *dentry, *parent;
const char *basename;
+ /* Make a normal file (not an alternate data stream) */
+
/* 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);
dentry = new_dentry(basename);
if (!dentry)
return -ENOMEM;
+ dentry->resolved = true;
dentry->hard_link = next_link_group_id++;
link_dentry(dentry, parent);
}
return 0;
}
- ret = extract_resource_to_staging_dir(dentry, <e, 0);
+ ret = extract_resource_to_staging_dir(dentry, stream_idx,
+ <e, 0);
if (ret != 0)
return ret;
- link_group_set_stream_hash(dentry, stream_idx, lte->hash);
}
ret = alloc_wimlib_fd(lte, &fd);
* but we need to extract the resource to the staging directory
* if we are opening it writable. */
if (flags_writable(fi->flags) && !lte->staging_file_name) {
- ret = extract_resource_to_staging_dir(dentry, <e,
+ ret = extract_resource_to_staging_dir(dentry, stream_idx, <e,
lte->resource_entry.original_size);
if (ret != 0)
return ret;
- link_group_set_stream_hash(dentry, stream_idx, lte->hash);
}
if (lte->staging_file_name) {
fd->staging_fd = open(lte->staging_file_name, fi->flags);
{
struct dentry *dentry_parent, *dentry;
const char *link_name;
+ struct lookup_table_entry *lte;
dentry_parent = get_parent_dentry(w, from);
if (!dentry_parent)
dentry->attributes = FILE_ATTRIBUTE_REPARSE_POINT;
dentry->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
- if (dentry_set_symlink(dentry, to, w->lookup_table) != 0)
+ if (dentry_set_symlink(dentry, to, w->lookup_table, <e) != 0)
goto out_free_dentry;
+ 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);
+ dentry->ads_entries[1].lte = lte;
+
link_dentry(dentry, dentry_parent);
return 0;
out_free_dentry:
struct dentry *dentry;
struct lookup_table_entry *lte;
int ret;
+ unsigned stream_idx;
ret = lookup_resource(w, path, get_lookup_flags(), &dentry,
- <e, NULL);
+ <e, &stream_idx);
if (ret != 0)
return ret;
} else {
/* File in WIM. Extract it to the staging directory, but only
* the first @size bytes of it. */
- ret = extract_resource_to_staging_dir(dentry, <e, size);
+ ret = extract_resource_to_staging_dir(dentry, stream_idx,
+ <e, size);
}
dentry_update_all_timestamps(dentry);
return ret;
struct ads_entry *ads_entry;
ads_entry = &dentry->ads_entries[stream_idx - 1];
-
- lookup_table_decrement_refcnt(w->lookup_table, ads_entry->hash);
-
+ lte_decrement_refcnt(lte, w->lookup_table);
+ list_del(&ads_entry->lte_group_list.list);
dentry_remove_ads(dentry, ads_entry);
}
/* Beware: The lookup table entry(s) may still be referenced by users
struct wimlib_fd *fd = (struct wimlib_fd*)fi->fh;
int ret;
+ wimlib_assert(fd);
wimlib_assert(fd->lte);
wimlib_assert(fd->lte->staging_file_name);
wimlib_assert(fd->staging_fd != -1);
next_link_group_id = assign_link_groups(wim->image_metadata[image - 1].lgt);
+ resolve_lookup_table_entries(wim_root_dentry(wim), w->lookup_table);
+
if (flags & WIMLIB_MOUNT_FLAG_READWRITE)
wim_get_current_image_metadata(wim)->modified = true;
git://wimlib.net / wimlib / blobdiff