New API: resize2fs-size to allow shrinking ext2 filesystems (RHBZ#585221).

[libguestfs.git] / daemon / ext2.c

diff --git a/daemon/ext2.c b/daemon/ext2.c
index ff6459b..3a075e5 100644 (file)
--- a/daemon/ext2.c
+++ b/daemon/ext2.c
@@ -20,6 +20,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <inttypes.h>
 #include <string.h>
 #include <unistd.h>
 
@@ -43,11 +44,11 @@ e2prog (char *name)
   p++;
 
   *p = '4';
-  if (access (name, X_OK) == 0)
+  if (prog_exists (name))
     return 0;
 
   *p = '2';
-  if (access (name, X_OK) == 0)
+  if (prog_exists (name))
     return 0;
 
   reply_with_error ("cannot find required program %s", name);
@@ -63,7 +64,7 @@ do_tune2fs_l (const char *device)
   char **ret = NULL;
   int size = 0, alloc = 0;
 
-  char prog[] = "/sbin/tune2fs";
+  char prog[] = "tune2fs";
   if (e2prog (prog) == -1)
     return NULL;
 
@@ -151,7 +152,7 @@ do_set_e2label (const char *device, const char *label)
   int r;
   char *err;
 
-  char prog[] = "/sbin/e2label";
+  char prog[] = "e2label";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -172,7 +173,7 @@ do_get_e2label (const char *device)
   int r, len;
   char *out, *err;
 
-  char prog[] = "/sbin/e2label";
+  char prog[] = "e2label";
   if (e2prog (prog) == -1)
     return NULL;
 
@@ -200,7 +201,7 @@ do_set_e2uuid (const char *device, const char *uuid)
   int r;
   char *err;
 
-  char prog[] = "/sbin/tune2fs";
+  char prog[] = "tune2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -225,7 +226,7 @@ do_get_e2uuid (const char *device)
    * to use tune2fs -l and then look for a particular string in
    * the output.
    */
-  char prog[] = "/sbin/tune2fs";
+  char prog[] = "tune2fs";
   if (e2prog (prog) == -1)
     return NULL;
 
@@ -285,7 +286,7 @@ do_resize2fs (const char *device)
   char *err;
   int r;
 
-  char prog[] = "/sbin/resize2fs";
+  char prog[] = "resize2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -301,16 +302,30 @@ do_resize2fs (const char *device)
 }
 
 int
-do_e2fsck_f (const char *device)
+do_resize2fs_size (const char *device, int64_t size)
 {
   char *err;
   int r;
 
-  char prog[] = "/sbin/e2fsck";
+  char prog[] = "resize2fs";
   if (e2prog (prog) == -1)
     return -1;
 
-  r = command (NULL, &err, prog, "-p", "-f", device, NULL);
+  /* resize2fs itself may impose additional limits.  Since we are
+   * going to use the 'K' suffix however we can only work with whole
+   * kilobytes.
+   */
+  if (size & 1023) {
+    reply_with_error ("%" PRIi64 ": size must be a round number of kilobytes",
+                      size);
+    return -1;
+  }
+  size /= 1024;
+
+  char buf[32];
+  snprintf (buf, sizeof buf, "%" PRIi64 "K", size);
+
+  r = command (NULL, &err, prog, device, buf, NULL);
   if (r == -1) {
     reply_with_error ("%s", err);
     free (err);
@@ -322,12 +337,40 @@ do_e2fsck_f (const char *device)
 }
 
 int
+do_e2fsck_f (const char *device)
+{
+  char *err;
+  int r;
+
+  char prog[] = "e2fsck";
+  if (e2prog (prog) == -1)
+    return -1;
+
+  /* 0 = no errors, 1 = errors corrected.
+   *
+   * >= 4 means uncorrected or other errors.
+   *
+   * 2, 3 means errors were corrected and we require a reboot.  This is
+   * a difficult corner case.
+   */
+  r = commandr (NULL, &err, prog, "-p", "-f", device, NULL);
+  if (r == -1 || r >= 2) {
+    reply_with_error ("%s", err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+  return 0;
+}
+
+int
 do_mke2journal (int blocksize, const char *device)
 {
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -353,7 +396,7 @@ do_mke2journal_L (int blocksize, const char *label, const char *device)
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -380,7 +423,7 @@ do_mke2journal_U (int blocksize, const char *uuid, const char *device)
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -408,7 +451,7 @@ do_mke2fs_J (const char *fstype, int blocksize, const char *device,
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -439,7 +482,7 @@ do_mke2fs_JL (const char *fstype, int blocksize, const char *device,
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -470,7 +513,7 @@ do_mke2fs_JU (const char *fstype, int blocksize, const char *device,
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;