[Libguestfs] [PATCH 2/4] New API: find_block
Library's counterpart of the daemon's internal_find_block command.
It writes the daemon's command output on a temporary file and parses it,
deserialising the XDR formatted tsk_dirent structs.
It returns to the caller the list of tsk_dirent structs generated by the
internal_find_block command.
Signed-off-by: Matteo Cafasso <noxdafox(a)gmail.com>
---
generator/actions.ml | 16 ++++++++++++++++
src/tsk.c | 26 ++++++++++++++++++++++++++
2 files changed, 42 insertions(+)
diff --git a/generator/actions.ml b/generator/actions.ml
index b38a30f..8947551 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -3729,6 +3729,22 @@ Searches all the entries associated with the given inode.
For each entry, a C<tsk_dirent> structure is returned.
See C<filesystem_walk> for more information about C<tsk_dirent>
structures." };
+ { defaults with
+ name = "find_block"; added = (1, 35, 6);
+ style = RStructList ("dirents", "tsk_dirent"), [Mountable
"device"; Int64 "block";], [];
+ optional = Some "libtsk";
+ progress = true; cancellable = true;
+ shortdesc = "search the entries referring to the given data block";
+ longdesc = "\
+Searches all the entries referring to the given data block.
+
+Certain filesystems preserve the block mapping when deleting a file.
+Therefore, it is possible to see multiple deleted files referring
+to the same block.
+
+For each entry, a C<tsk_dirent> structure is returned.
+See C<filesystem_walk> for more information about C<tsk_dirent>
structures." };
+
]
(* daemon_functions are any functions which cause some action
diff --git a/src/tsk.c b/src/tsk.c
index d3da834..6b1b29c 100644
--- a/src/tsk.c
+++ b/src/tsk.c
@@ -89,6 +89,32 @@ guestfs_impl_find_inode (guestfs_h *g, const char *mountable, int64_t
inode)
return parse_dirent_file (g, fp); /* caller frees */
}
+struct guestfs_tsk_dirent_list *
+guestfs_impl_find_block (guestfs_h *g, const char *mountable, int64_t block)
+{
+ int ret = 0;
+ CLEANUP_FCLOSE FILE *fp = NULL;
+ CLEANUP_UNLINK_FREE char *tmpfile = NULL;
+
+ ret = guestfs_int_lazy_make_tmpdir (g);
+ if (ret < 0)
+ return NULL;
+
+ tmpfile = safe_asprintf (g, "%s/find_block%d", g->tmpdir,
++g->unique);
+
+ ret = guestfs_internal_find_block (g, mountable, block, tmpfile);
+ if (ret < 0)
+ return NULL;
+
+ fp = fopen (tmpfile, "r");
+ if (fp == NULL) {
+ perrorf (g, "fopen: %s", tmpfile);
+ return NULL;
+ }
+
+ return parse_dirent_file (g, fp); /* caller frees */
+}
+
/* Parse the file content and return dirents list.
* Return a list of tsk_dirent on success, NULL on error.
*/
--
2.9.3