Add basic infrastructure for storing xattr items

[wimlib] / include / wimlib / apply.h

diff --git a/include/wimlib/apply.h b/include/wimlib/apply.h
index 2d706b4e47d6e5b9a46cf2158a2b00babcf9cd6c..cfddd1ed57ef8b601257de1106a5a09c70a06b50 100644 (file)
--- a/include/wimlib/apply.h
+++ b/include/wimlib/apply.h
@@ -11,9 +11,10 @@
 /* These can be treated as counts (for required_features) or booleans (for
  * supported_features).  */
 struct wim_features {
-       unsigned long archive_files;
+       unsigned long readonly_files;
        unsigned long hidden_files;
        unsigned long system_files;
+       unsigned long archive_files;
        unsigned long compressed_files;
        unsigned long encrypted_files;
        unsigned long encrypted_directories;
@@ -27,8 +28,10 @@ struct wim_features {
        unsigned long security_descriptors;
        unsigned long short_names;
        unsigned long unix_data;
+       unsigned long object_ids;
        unsigned long timestamps;
        unsigned long case_sensitive_filenames;
+       unsigned long linux_xattrs;
 };
 
 struct blob_descriptor;
@@ -70,8 +73,6 @@ struct apply_ctx {
        unsigned long num_blobs_remaining;
        struct list_head blob_list;
        const struct read_blob_callbacks *saved_cbs;
-       struct blob_descriptor *cur_blob;
-       u64 cur_blob_offset;
        struct filedes tmpfile_fd;
        tchar *tmpfile_name;
        unsigned int count_until_file_progress;
@@ -134,10 +135,28 @@ report_apply_error(struct apply_ctx *ctx, int error_code, const tchar *path)
        return report_error(ctx->progfunc, ctx->progctx, error_code, path);
 }
 
-/* Returns any of the aliases of an inode that are being extracted.  */
-#define inode_first_extraction_dentry(inode)           \
-       list_first_entry(&(inode)->i_extraction_aliases,        \
-                        struct wim_dentry, d_extraction_alias_node)
+extern bool
+detect_sparse_region(const void *data, size_t size, size_t *len_ret);
+
+static inline bool
+maybe_detect_sparse_region(const void *data, size_t size, size_t *len_ret,
+                          bool enabled)
+{
+       if (!enabled) {
+               /* Force non-sparse without checking */
+               *len_ret = size;
+               return false;
+       }
+       return detect_sparse_region(data, size, len_ret);
+}
+
+#define inode_first_extraction_dentry(inode)                           \
+       ((inode)->i_first_extraction_alias)
+
+#define inode_for_each_extraction_alias(dentry, inode)                 \
+       for (dentry = inode_first_extraction_dentry(inode);             \
+            dentry != NULL;                                            \
+            dentry = dentry->d_next_extraction_alias)
 
 extern int
 extract_blob_list(struct apply_ctx *ctx, const struct read_blob_callbacks *cbs);
@@ -195,14 +214,13 @@ struct apply_operations {
         *
         * 'd_extraction_name' and 'd_extraction_name_nchars' of each dentry
         * will be set to indicate the actual name with which the dentry should
-        * be extracted.  This may or may not be the same as 'file_name'.
-        * TODO: really, the extraction backends should be responsible for
-        * generating 'd_extraction_name'.
+        * be extracted.  This may or may not be the same as 'd_name'.  TODO:
+        * really, the extraction backends should be responsible for generating
+        * 'd_extraction_name'.
         *
-        * Each dentry will refer to a valid inode in 'd_inode'.
-        * 'd_inode->i_extraction_aliases' will contain a list of just the
-        * dentries of that inode being extracted.  This will be a (possibly
-        * nonproper) subset of the 'd_inode->i_dentry' list.
+        * Each dentry will refer to a valid inode in 'd_inode'.  Each inode
+        * will contain a list of dentries of that inode being extracted; this
+        * list may be shorter than the inode's full dentry list.
         *
         * The blobs required to be extracted will already be prepared in
         * 'apply_ctx'.  The extraction backend should call extract_blob_list()
@@ -218,9 +236,10 @@ struct apply_operations {
 
        /*
         * Query whether the unnamed data stream of the specified file will be
-        * extracted as "externally backed".  If so, the extraction backend is
-        * assumed to handle this separately, and the common extraction code
-        * will not register a usage of the unnamed data stream's blob.
+        * extracted as "externally backed" from the WIM archive itself.  If so,
+        * then the extraction backend is assumed to handle this separately, and
+        * the common extraction code will not register a usage of the unnamed
+        * data stream's blob.
         *
         * This routine is optional.
         *
@@ -229,7 +248,7 @@ struct apply_operations {
         *      = 0 if the file will be externally backed.
         *      > 0 (wimlib error code) if another error occurred.
         */
-       int (*will_externally_back)(struct wim_dentry *dentry, struct apply_ctx *ctx);
+       int (*will_back_from_wim)(struct wim_dentry *dentry, struct apply_ctx *ctx);
 
        /*
         * Size of the backend-specific extraction context.  It must contain