mdadm/Detail: show correct state for clustered array

[thirdparty/mdadm.git] / bitmap.c

diff --git a/bitmap.c b/bitmap.c
index e38cb9650390235d481aeba3b3fa38b724e37910..9a7ffe3bb1bf209d2246ef539800272444ec63ce 100644 (file)
--- a/bitmap.c
+++ b/bitmap.c
@@ -180,13 +180,14 @@ out:
 }
 
 static int
-bitmap_file_open(char *filename, struct supertype **stp, int node_num)
+bitmap_file_open(char *filename, struct supertype **stp, int node_num, int fd)
 {
-       int fd;
        struct stat stb;
        struct supertype *st = *stp;
 
-       fd = open(filename, O_RDONLY|O_DIRECT);
+       /* won't re-open filename when (fd >= 0) */
+       if (fd < 0)
+               fd = open(filename, O_RDONLY|O_DIRECT);
        if (fd < 0) {
                pr_err("failed to open bitmap file %s: %s\n",
                       filename, strerror(errno));
@@ -249,7 +250,7 @@ int ExamineBitmap(char *filename, int brief, struct supertype *st)
        int fd, i;
        __u32 uuid32[4];
 
-       fd = bitmap_file_open(filename, &st, 0);
+       fd = bitmap_file_open(filename, &st, 0, -1);
        if (fd < 0)
                return rv;
 
@@ -263,7 +264,6 @@ int ExamineBitmap(char *filename, int brief, struct supertype *st)
                pr_err("Reporting bitmap that would be used if this array were used\n");
                pr_err("as a member of some other array\n");
        }
-       close(fd);
        printf("        Filename : %s\n", filename);
        printf("           Magic : %08x\n", sb->magic);
        if (sb->magic != BITMAP_MAGIC) {
@@ -332,15 +332,13 @@ int ExamineBitmap(char *filename, int brief, struct supertype *st)
                for (i = 0; i < (int)sb->nodes; i++) {
                        st = NULL;
                        free(info);
-                       fd = bitmap_file_open(filename, &st, i);
+                       fd = bitmap_file_open(filename, &st, i, fd);
                        if (fd < 0) {
                                printf("   Unable to open bitmap file on node: %i\n", i);
-
                                continue;
                        }
                        info = bitmap_fd_read(fd, brief);
                        if (!info) {
-                               close(fd);
                                printf("   Unable to read bitmap on node: %i\n", i);
                                continue;
                        }
@@ -359,13 +357,72 @@ int ExamineBitmap(char *filename, int brief, struct supertype *st)
                        printf("          Bitmap : %llu bits (chunks), %llu dirty (%2.1f%%)\n",
                               info->total_bits, info->dirty_bits,
                               100.0 * info->dirty_bits / (info->total_bits?:1));
-                        close(fd);
                }
        }
 
 free_info:
+       close(fd);
+       free(info);
+       return rv;
+}
+
+int IsBitmapDirty(char *filename)
+{
+       /*
+        * Read the bitmap file
+        * It will break reading bitmap action immediately when meeting any error.
+        *
+        * Return: 1(dirty), 0 (clean), -1(error)
+        */
+
+       int fd = -1, rv = 0, i;
+       struct supertype *st = NULL;
+       bitmap_info_t *info = NULL;
+       bitmap_super_t *sb = NULL;
+
+       fd = bitmap_file_open(filename, &st, 0, fd);
+       free(st);
+       if (fd < 0)
+               goto out;
+
+       info = bitmap_fd_read(fd, 0);
+       if (!info) {
+               close(fd);
+               goto out;
+       }
+
+       sb = &info->sb;
+       for (i = 0; i < (int)sb->nodes; i++) {
+               st = NULL;
+               free(info);
+               info = NULL;
+
+               fd = bitmap_file_open(filename, &st, i, fd);
+               free(st);
+               if (fd < 0)
+                       goto out;
+
+               info = bitmap_fd_read(fd, 0);
+               if (!info) {
+                       close(fd);
+                       goto out;
+               }
+
+               sb = &info->sb;
+               if (sb->magic != BITMAP_MAGIC) { /* invalid bitmap magic */
+                       free(info);
+                       close(fd);
+                       goto out;
+               }
+
+               if (info->dirty_bits)
+                       rv = 1;
+       }
+       close(fd);
        free(info);
        return rv;
+out:
+       return -1;
 }
 
 int CreateBitmap(char *filename, int force, char uuid[16],