incorporate Fedora patch for sector sizes > 512 bytes

[debian/efibootmgr] / src / lib / gpt.c

diff --git a/src/lib/gpt.c b/src/lib/gpt.c
index d90ddaf235c072ffe3626c0f358345f1042a59d9..83e7a94fe3eed3231a9b19d2763c29bb2f6818f3 100644 (file)
--- a/src/lib/gpt.c
+++ b/src/lib/gpt.c
@@ -215,26 +215,24 @@ read_lastoddsector(int fd, uint64_t lba, void *buffer, size_t count)
 static ssize_t
 read_lba(int fd, uint64_t lba, void *buffer, size_t bytes)
 {
-       int sector_size = get_sector_size(fd);
-       off_t offset = lba * sector_size;
+        int sector_size = get_sector_size(fd);
+        off_t offset = lba * sector_size;
         ssize_t bytesread;
-        void *aligned;
-        void *unaligned;
-
-        if (bytes % sector_size)
-                return EINVAL;
+        void *iobuf;
+        size_t iobuf_size;
+        int rc;
 
-       unaligned = malloc(bytes+sector_size-1);
-       aligned = (void *)
-               (((unsigned long)unaligned + sector_size - 1) &
-                ~(unsigned long)(sector_size-1));
-       memset(aligned, 0, bytes);
+        iobuf_size = lcm(bytes, sector_size);
+        rc = posix_memalign(&iobuf, sector_size, iobuf_size);
+        if (rc)
+                return rc;
+        memset(iobuf, 0, bytes);
 
 
-       lseek(fd, offset, SEEK_SET);
-       bytesread = read(fd, aligned, bytes);
-        memcpy(buffer, aligned, bytesread);
-        free(unaligned);
+        lseek(fd, offset, SEEK_SET);
+        bytesread = read(fd, iobuf, iobuf_size);
+        memcpy(buffer, iobuf, bytes);
+        free(iobuf);
 
         /* Kludge.  This is necessary to read/write the last
            block of an odd-sized disk, until Linux 2.5.x kernel fixes.