X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=src%2Fdentry.c;h=ea21e07b57e90540adfccd65fb0485adeab3e39e;hb=2a7e6a7d014689899c90a926a095a53753488967;hp=56a06041cb92c2e180583d22588da30b1a2cd764;hpb=57f46659cb922a738b13658c8da87c7306160bff;p=wimlib

diff --git a/src/dentry.c b/src/dentry.c
index 56a06041..ea21e07b 100644
--- a/src/dentry.c
+++ b/src/dentry.c
@@ -39,6 +39,18 @@
 #include <unistd.h>
 #include <sys/stat.h>
 
+/*
+ * Returns true if @dentry has the UTF-8 file name @name that has length
+ * @name_len.
+ */
+static bool dentry_has_name(const struct dentry *dentry, const char *name, 
+			    size_t name_len)
+{
+	if (dentry->file_name_utf8_len != name_len)
+		return false;
+	return memcmp(dentry->file_name_utf8, name, name_len) == 0;
+}
+
 /* Real length of a dentry, including the alternate data stream entries, which
  * are not included in the dentry->length field... */
 u64 dentry_total_length(const struct dentry *dentry)
@@ -52,41 +64,59 @@ u64 dentry_total_length(const struct dentry *dentry)
 /* Transfers file attributes from a `stat' buffer to a struct dentry. */
 void stbuf_to_dentry(const struct stat *stbuf, struct dentry *dentry)
 {
-	if (S_ISDIR(stbuf->st_mode))
+	if (S_ISLNK(stbuf->st_mode)) {
+		dentry->attributes = FILE_ATTRIBUTE_REPARSE_POINT;
+		dentry->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
+	} else if (S_ISDIR(stbuf->st_mode)) {
 		dentry->attributes = FILE_ATTRIBUTE_DIRECTORY;
-	else
+	} else {
 		dentry->attributes = FILE_ATTRIBUTE_NORMAL;
+	}
+	if (sizeof(ino_t) >= 8)
+		dentry->hard_link = (u64)stbuf->st_ino;
+	else
+		dentry->hard_link = (u64)stbuf->st_ino |
+				   ((u64)stbuf->st_dev << (sizeof(ino_t) * 8));
 }
 
 /* Transfers file attributes from a struct dentry to a `stat' buffer. */
-void dentry_to_stbuf(const struct dentry *dentry, struct stat *stbuf, 
-		     const struct lookup_table *table)
+int dentry_to_stbuf(const struct dentry *dentry, struct stat *stbuf, 
+		    const struct lookup_table *table)
 {
 	struct lookup_table_entry *lte;
 
-	if (dentry_is_directory(dentry))
+	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 (table)
-		lte = lookup_resource(table, dentry->hash);
-	else
-		lte = NULL;
+	stbuf->st_ino = (ino_t)dentry->hard_link;
 
-	if (lte) {
-		stbuf->st_nlink = lte->refcnt;
-		stbuf->st_size = lte->resource_entry.original_size;
+	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 (table && (lte = __lookup_resource(table, dentry_hash(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 {
-		stbuf->st_nlink = 1;
 		stbuf->st_size = 0;
 	}
-	stbuf->st_uid     = getuid();
-	stbuf->st_gid     = getgid();
+
 	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;
 }
 
 /* Makes all timestamp fields for the dentry be the current time. */
@@ -98,6 +128,55 @@ void dentry_update_all_timestamps(struct dentry *dentry)
 	dentry->last_write_time  = now;
 }
 
+struct ads_entry *dentry_get_ads_entry(struct dentry *dentry,
+				       const char *stream_name)
+{
+	size_t stream_name_len = strlen(stream_name);
+	if (!stream_name)
+		return NULL;
+	for (u16 i = 0; i < dentry->num_ads; i++)
+		if (ads_entry_has_name(&dentry->ads_entries[i],
+				       stream_name, stream_name_len))
+			return &dentry->ads_entries[i];
+	return NULL;
+}
+
+/* Add an alternate stream entry to a dentry and return a pointer to it, or NULL
+ * on failure. */
+struct ads_entry *dentry_add_ads(struct dentry *dentry, const char *stream_name)
+{
+	u16 num_ads = dentry->num_ads + 1;
+	struct ads_entry *ads_entries;
+	struct ads_entry *new_entry;
+	if (num_ads == 0xffff)
+		return NULL;
+	ads_entries = MALLOC(num_ads * sizeof(struct ads_entry));
+	if (!ads_entries)
+		return NULL;
+
+	new_entry = &ads_entries[num_ads - 1];
+	if (change_ads_name(new_entry, stream_name) != 0) {
+		FREE(ads_entries);
+		return NULL;
+	}
+
+	memcpy(ads_entries, dentry->ads_entries,
+	       (num_ads - 1) * sizeof(struct ads_entry));
+	FREE(dentry->ads_entries);
+	dentry->ads_entries = ads_entries;
+	dentry->num_ads = num_ads;
+	return memset(new_entry, 0, sizeof(struct ads_entry));
+}
+
+void dentry_remove_ads(struct dentry *dentry, struct ads_entry *sentry)
+{
+	destroy_ads_entry(sentry);
+	memcpy(sentry, sentry + 1,
+	       (dentry->num_ads - (sentry - dentry->ads_entries + 1))
+		 * sizeof(struct ads_entry));
+	dentry->num_ads--;
+}
+
 /* 
  * Calls a function on all directory entries in a directory tree.  It is called
  * on a parent before its children.
@@ -358,11 +437,10 @@ int print_dentry(struct dentry *dentry, void *lookup_table)
 	printf("Subdir offset     = %"PRIu64"\n", dentry->subdir_offset);
 	/*printf("Unused1           = 0x%"PRIu64"\n", dentry->unused1);*/
 	/*printf("Unused2           = %"PRIu64"\n", dentry->unused2);*/
-	printf("Creation Time     = %"PRIu64"\n", dentry->creation_time);
-	printf("Last Access Time  = %"PRIu64"\n", dentry->last_access_time);
-	printf("Last Write Time   = %"PRIu64"\n", dentry->last_write_time);
 	printf("Creation Time     = 0x%"PRIx64"\n", dentry->creation_time);
-	printf("Hash              = "); 
+	printf("Last Access Time  = 0x%"PRIx64"\n", dentry->last_access_time);
+	printf("Last Write Time   = 0x%"PRIx64"\n", dentry->last_write_time);
+	printf("Hash              = 0x"); 
 	print_hash(dentry->hash); 
 	putchar('\n');
 	printf("Reparse Tag       = 0x%"PRIx32"\n", dentry->reparse_tag);
@@ -379,25 +457,25 @@ int print_dentry(struct dentry *dentry, void *lookup_table)
 	puts("\"");
 	printf("Short Name Length = %hu\n", dentry->short_name_len);
 	printf("Full Path (UTF-8) = \"%s\"\n", dentry->full_path_utf8);
-	if (lookup_table) {
-		lte = lookup_resource(lookup_table, dentry->hash);
-		if (lte)
-			print_lookup_table_entry(lte, NULL);
-		else
-			putchar('\n');
-	} else {
+	if (lookup_table && (lte = __lookup_resource(lookup_table, dentry->hash)))
+		print_lookup_table_entry(lte, NULL);
+	else
 		putchar('\n');
-	}
 	for (u16 i = 0; i < dentry->num_ads; i++) {
 		printf("[Alternate Stream Entry %u]\n", i);
 		printf("Name = \"%s\"\n", dentry->ads_entries[i].stream_name_utf8);
 		printf("Name Length (UTF-16) = %u\n",
 				dentry->ads_entries[i].stream_name_len);
-		lte = lookup_resource(lookup_table, dentry->ads_entries[i].hash);
-		if (lte)
+		printf("Hash              = 0x"); 
+		print_hash(dentry->ads_entries[i].hash); 
+		if (lookup_table &&
+		     (lte = __lookup_resource(lookup_table,
+					      dentry->ads_entries[i].hash)))
+		{
 			print_lookup_table_entry(lte, NULL);
-		else
+		} else {
 			putchar('\n');
+		}
 	}
 	return 0;
 }
@@ -407,6 +485,7 @@ static inline void dentry_common_init(struct dentry *dentry)
 	memset(dentry, 0, sizeof(struct dentry));
 	dentry->refcnt = 1;
 	dentry->security_id = -1;
+	dentry->link_group_master_status = GROUP_SLAVE;
 }
 
 /* 
@@ -421,31 +500,148 @@ struct dentry *new_dentry(const char *name)
 	
 	dentry = MALLOC(sizeof(struct dentry));
 	if (!dentry)
-		return NULL;
+		goto err;
 
 	dentry_common_init(dentry);
-	if (change_dentry_name(dentry, name) != 0) {
-		FREE(dentry);
-		return NULL;
-	}
+	if (change_dentry_name(dentry, name) != 0)
+		goto err;
 
 	dentry_update_all_timestamps(dentry);
 	dentry->next   = dentry;
 	dentry->prev   = dentry;
 	dentry->parent = dentry;
+	INIT_LIST_HEAD(&dentry->link_group_list);
 	return dentry;
+err:
+	FREE(dentry);
+	ERROR("Failed to allocate new dentry");
+	return NULL;
 }
 
+void dentry_free_ads_entries(struct dentry *dentry)
+{
+	for (u16 i = 0; i < dentry->num_ads; i++)
+		destroy_ads_entry(&dentry->ads_entries[i]);
+	FREE(dentry->ads_entries);
+	dentry->ads_entries = NULL;
+	dentry->num_ads = 0;
+}
 
-void free_dentry(struct dentry *dentry)
+static void __destroy_dentry(struct dentry *dentry)
 {
 	FREE(dentry->file_name);
 	FREE(dentry->file_name_utf8);
 	FREE(dentry->short_name);
 	FREE(dentry->full_path_utf8);
+}
+
+void free_dentry(struct dentry *dentry)
+{
+	__destroy_dentry(dentry);
+	if (dentry->link_group_master_status != GROUP_SLAVE)
+		dentry_free_ads_entries(dentry);
 	FREE(dentry);
 }
 
+void put_dentry(struct dentry *dentry)
+{
+	if (dentry->link_group_master_status == GROUP_MASTER) {
+		struct dentry *new_master;
+		list_for_each_entry(new_master, &dentry->link_group_list,
+				    link_group_list)
+		{
+			if (new_master->link_group_master_status == GROUP_SLAVE) {
+				new_master->link_group_master_status = GROUP_MASTER;
+				dentry->link_group_master_status = GROUP_SLAVE;
+				break;
+			}
+		}
+	}
+	struct list_head *next;
+	next = dentry->link_group_list.next;
+	list_del(&dentry->link_group_list);
+	/*if (next->next == next)*/
+		/*container_of(next, struct dentry, link_group_list)->hard_link = 0;*/
+	free_dentry(dentry);
+}
+
+static bool dentries_have_same_ads(const struct dentry *d1,
+				   const struct dentry *d2)
+{
+	/* Verify stream names and hashes are the same */
+	for (u16 i = 0; i < d1->num_ads; i++) {
+		if (strcmp(d1->ads_entries[i].stream_name_utf8,
+			   d2->ads_entries[i].stream_name_utf8) != 0)
+			return false;
+		if (memcmp(d1->ads_entries[i].hash,
+			   d2->ads_entries[i].hash,
+			   WIM_HASH_SIZE) != 0)
+			return false;
+	}
+	return true;
+}
+
+/* Share the alternate stream entries between hard-linked dentries. */
+int share_dentry_ads(struct dentry *master, struct dentry *slave)
+{
+	const char *mismatch_type;
+	wimlib_assert(master->num_ads == 0 ||
+		      master->ads_entries != slave->ads_entries);
+	if (master->attributes != slave->attributes) {
+		mismatch_type = "attributes";
+		goto mismatch;
+	}
+	if (master->attributes & FILE_ATTRIBUTE_DIRECTORY) {
+		ERROR("`%s' is hard-linked to `%s', which is a directory ",
+		      slave->full_path_utf8, master->full_path_utf8);
+		return WIMLIB_ERR_INVALID_DENTRY;
+	}
+	if (master->security_id != slave->security_id) {
+		mismatch_type = "security ID";
+		goto mismatch;
+	}
+	if (memcmp(master->hash, slave->hash, WIM_HASH_SIZE) != 0) {
+		mismatch_type = "main file resource";
+		goto mismatch;
+	}
+	if (!dentries_have_same_ads(master, slave)) {
+		mismatch_type = "Alternate Stream Entries";
+		goto mismatch;
+	}
+	dentry_free_ads_entries(slave);
+	slave->ads_entries = master->ads_entries;
+	slave->link_group_master_status = GROUP_SLAVE;
+	return 0;
+mismatch:
+	ERROR("Dentries `%s' and `%s' in the same hard-link group but "
+	      "do not share the same %s",
+	      master->full_path_utf8, slave->full_path_utf8,
+	      mismatch_type);
+	return WIMLIB_ERR_INVALID_DENTRY;
+}
+
+/* clones a dentry.
+ *
+ * Beware:
+ * 	- memory for file names is not cloned
+ * 	- next, prev, and children pointers and not touched
+ * 	- stream entries are not cloned.
+ */
+struct dentry *clone_dentry(struct dentry *old)
+{
+	struct dentry *new = MALLOC(sizeof(struct dentry));
+	if (!new)
+		return NULL;
+	memcpy(new, old, sizeof(struct dentry));
+	new->file_name          = NULL;
+	new->file_name_len      = 0;
+	new->file_name_utf8     = NULL;
+	new->file_name_utf8_len = 0;
+	new->short_name         = NULL;
+	new->short_name_len     = 0;
+	return new;
+}
+
 /* Arguments for do_free_dentry(). */
 struct free_dentry_args {
 	struct lookup_table *lookup_table;
@@ -520,7 +716,13 @@ void link_dentry(struct dentry *dentry, struct dentry *parent)
 	}
 }
 
-/* Unlink a dentry from the directory tree. */
+
+/* Unlink a dentry from the directory tree. 
+ *
+ * Note: This merely removes it from the in-memory tree structure.  See
+ * remove_dentry() in mount.c for a function implemented on top of this one that
+ * frees the dentry and implements reference counting for the lookup table
+ * entries. */
 void unlink_dentry(struct dentry *dentry)
 {
 	if (dentry_is_root(dentry))
@@ -546,38 +748,59 @@ static inline void recalculate_dentry_size(struct dentry *dentry)
 	dentry->length = (dentry->length + 7) & ~7;
 }
 
-/* Changes the name of a dentry to @new_name.  Only changes the file_name and
- * file_name_utf8 fields; does not change the short_name, short_name_utf8, or
- * full_path_utf8 fields.  Also recalculates its length. */
-int change_dentry_name(struct dentry *dentry, const char *new_name)
+int get_names(char **name_utf16_ret, char **name_utf8_ret,
+	      u16 *name_utf16_len_ret, u16 *name_utf8_len_ret,
+	      const char *name)
 {
 	size_t utf8_len;
 	size_t utf16_len;
+	char *name_utf16, *name_utf8;
 
-	FREE(dentry->file_name);
-
-	utf8_len = strlen(new_name);
+	utf8_len = strlen(name);
 
-	dentry->file_name = utf8_to_utf16(new_name, utf8_len, &utf16_len);
+	name_utf16 = utf8_to_utf16(name, utf8_len, &utf16_len);
 
-	if (!dentry->file_name)
+	if (!name_utf16)
 		return WIMLIB_ERR_NOMEM;
 
-	FREE(dentry->file_name_utf8);
-	dentry->file_name_utf8 = MALLOC(utf8_len + 1);
-	if (!dentry->file_name_utf8) {
-		FREE(dentry->file_name);
-		dentry->file_name = NULL;
+	name_utf8 = MALLOC(utf8_len + 1);
+	if (!name_utf8) {
+		FREE(name_utf8);
 		return WIMLIB_ERR_NOMEM;
 	}
-
-	dentry->file_name_len = utf16_len;
-	dentry->file_name_utf8_len = utf8_len;
-	memcpy(dentry->file_name_utf8, new_name, utf8_len + 1);
-	recalculate_dentry_size(dentry);
+	memcpy(name_utf8, name, utf8_len + 1);
+	FREE(*name_utf8_ret);
+	FREE(*name_utf16_ret);
+	*name_utf8_ret      = name_utf8;
+	*name_utf16_ret     = name_utf16;
+	*name_utf8_len_ret  = utf8_len;
+	*name_utf16_len_ret = utf16_len;
 	return 0;
 }
 
+/* Changes the name of a dentry to @new_name.  Only changes the file_name and
+ * file_name_utf8 fields; does not change the short_name, short_name_utf8, or
+ * full_path_utf8 fields.  Also recalculates its length. */
+int change_dentry_name(struct dentry *dentry, const char *new_name)
+{
+	int ret;
+
+	ret = get_names(&dentry->file_name, &dentry->file_name_utf8,
+			&dentry->file_name_len, &dentry->file_name_utf8_len,
+			 new_name);
+	if (ret == 0)
+		recalculate_dentry_size(dentry);
+	return ret;
+}
+
+int change_ads_name(struct ads_entry *entry, const char *new_name)
+{
+	return get_names(&entry->stream_name, &entry->stream_name_utf8,
+			 &entry->stream_name_len,
+			 &entry->stream_name_utf8_len,
+			  new_name);
+}
+
 /* Parameters for calculate_dentry_statistics(). */
 struct image_statistics {
 	struct lookup_table *lookup_table;
@@ -591,21 +814,31 @@ static int calculate_dentry_statistics(struct dentry *dentry, void *arg)
 {
 	struct image_statistics *stats;
 	struct lookup_table_entry *lte; 
+	u16 i;
 	
 	stats = arg;
-	lte = lookup_resource(stats->lookup_table, dentry->hash);
 
 	if (dentry_is_directory(dentry) && !dentry_is_root(dentry))
 		++*stats->dir_count;
 	else
 		++*stats->file_count;
 
-	if (lte) {
-		u64 size = lte->resource_entry.original_size;
-		*stats->total_bytes += size;
-		if (++lte->out_refcnt == 1)
-			*stats->hard_link_bytes += size;
+	lte = __lookup_resource(stats->lookup_table, dentry->hash);
+	i = 0;
+	while (1) {
+		if (lte) {
+			u64 size = lte->resource_entry.original_size;
+			*stats->total_bytes += size;
+			if (++lte->out_refcnt == 1)
+				*stats->hard_link_bytes += size;
+		}
+		if (i == dentry->num_ads)
+			break;
+		lte = __lookup_resource(stats->lookup_table,
+					dentry->ads_entries[i].hash);
+		i++;
 	}
+
 	return 0;
 }
 
@@ -689,7 +922,7 @@ static int read_ads_entries(const u8 *p, struct dentry *dentry,
 		cur_entry->stream_name_utf8 = utf16_to_utf8(cur_entry->stream_name,
 							    cur_entry->stream_name_len,
 							    &utf8_len);
-		cur_entry->stream_name_len_utf8 = utf8_len;
+		cur_entry->stream_name_utf8_len = utf8_len;
 
 		if (!cur_entry->stream_name_utf8) {
 			ret = WIMLIB_ERR_NOMEM;
@@ -787,13 +1020,9 @@ int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len,
 	 */
 	if (dentry->attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 		/* ??? */
-		u32 u1, u2;
-		p = get_u32(p, &u1);
-		/*p += 4;*/
+		p += 4;
 		p = get_u32(p, &dentry->reparse_tag);
-		p = get_u32(p, &u2);
-		/*p += 4;*/
-		dentry->hard_link = (u64)(u1) | ((u64)(u2) << 32);
+		p += 4;
 	} else {
 		p = get_u32(p, &dentry->reparse_tag);
 		p = get_u64(p, &dentry->hard_link);
@@ -930,7 +1159,8 @@ out_free_file_name:
 static u8 *write_dentry(const struct dentry *dentry, u8 *p)
 {
 	u8 *orig_p = p;
-	memset(p, 0, dentry->length);
+	unsigned padding;
+
 	p = put_u64(p, dentry->length);
 	p = put_u32(p, dentry->attributes);
 	p = put_u32(p, dentry->security_id);
@@ -940,16 +1170,33 @@ static u8 *write_dentry(const struct dentry *dentry, u8 *p)
 	p = put_u64(p, dentry->creation_time);
 	p = put_u64(p, dentry->last_access_time);
 	p = put_u64(p, dentry->last_write_time);
-	memcpy(p, dentry->hash, WIM_HASH_SIZE);
-	p += WIM_HASH_SIZE;
-	p = put_u32(p, dentry->reparse_tag);
-	p = put_u64(p, dentry->hard_link);
-	p = put_u16(p, dentry->num_ads); /*streams */
+	p = put_bytes(p, WIM_HASH_SIZE, dentry->hash);
+	if (dentry->attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
+		p = put_zeroes(p, 4);
+		p = put_u32(p, dentry->reparse_tag);
+		p = put_zeroes(p, 4);
+	} else {
+		u64 hard_link;
+		p = put_u32(p, dentry->reparse_tag);
+		if (dentry->link_group_list.next == &dentry->link_group_list)
+			hard_link = 0;
+		else
+			hard_link = dentry->hard_link;
+		p = put_u64(p, hard_link);
+	}
+	p = put_u16(p, dentry->num_ads);
 	p = put_u16(p, dentry->short_name_len);
 	p = put_u16(p, dentry->file_name_len);
 	p = put_bytes(p, dentry->file_name_len, (u8*)dentry->file_name);
 	p = put_u16(p, 0); /* filename padding, 2 bytes. */
 	p = put_bytes(p, dentry->short_name_len, (u8*)dentry->short_name);
+
+	wimlib_assert(p - orig_p <= dentry->length);
+	if (p - orig_p < dentry->length)
+		p = put_zeroes(p, dentry->length - (p - orig_p));
+
+	p = put_zeroes(p, (8 - (p - orig_p) % 8) % 8);
+
 	for (u16 i = 0; i < dentry->num_ads; i++) {
 		p = put_u64(p, ads_entry_length(&dentry->ads_entries[i]));
 		p = put_u64(p, 0); /* Unused */
@@ -957,8 +1204,9 @@ static u8 *write_dentry(const struct dentry *dentry, u8 *p)
 		p = put_u16(p, dentry->ads_entries[i].stream_name_len);
 		p = put_bytes(p, dentry->ads_entries[i].stream_name_len,
 				 (u8*)dentry->ads_entries[i].stream_name);
+		p = put_zeroes(p, (8 - (p - orig_p) % 8) % 8);
 	}
-	return orig_p + dentry->length;
+	return p;
 }
 
 /* Recursive function that writes a dentry tree rooted at @tree, not including
@@ -974,8 +1222,8 @@ u8 *write_dentry_tree(const struct dentry *tree, u8 *p)
 		/* write end of directory entry */
 		p = put_u64(p, 0);
 	} else {
-		/* Nothing to do for a regular file. */
-		if (dentry_is_regular_file(tree))
+		/* Nothing to do for non-directories */
+		if (!dentry_is_directory(tree))
 			return p;
 	}