This commit moves functionality associated with opening the target device,
reading metadump header information and printing information about the
metadump into their respective functions. There are no functional changes made
by this commit.
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Signed-off-by: Chandan Babu R <chandan.babu@xxxxxxxxxx>
---
mdrestore/xfs_mdrestore.c | 141 +++++++++++++++++++++++---------------
1 file changed, 84 insertions(+), 57 deletions(-)
diff --git a/mdrestore/xfs_mdrestore.c b/mdrestore/xfs_mdrestore.c
index ffa8274f..d67a0629 100644
--- a/mdrestore/xfs_mdrestore.c
+++ b/mdrestore/xfs_mdrestore.c
@@ -6,6 +6,7 @@
#include "libxfs.h"
#include "xfs_metadump.h"
+#include <libfrog/platform.h>
static struct mdrestore {
bool show_progress;
@@ -40,8 +41,71 @@ print_progress(const char *fmt, ...)
mdrestore.progress_since_warning = true;
}
+static int
+open_device(
+ char *path,
+ bool *is_file)
+{
+ struct stat statbuf;
+ int open_flags;
+ int fd;
+
+ open_flags = O_RDWR;
+ *is_file = false;
+
+ if (stat(path, &statbuf) < 0) {
+ /* ok, assume it's a file and create it */
+ open_flags |= O_CREAT;
+ *is_file = true;
+ } else if (S_ISREG(statbuf.st_mode)) {
+ open_flags |= O_TRUNC;
+ *is_file = true;
+ } else if (platform_check_ismounted(path, NULL, &statbuf, 0)) {
+ /*
+ * check to make sure a filesystem isn't mounted on the device
+ */
+ fatal("a filesystem is mounted on target device \"%s\","
+ " cannot restore to a mounted filesystem.\n",
+ path);
+ }
+
+ fd = open(path, open_flags, 0644);
+ if (fd < 0)
+ fatal("couldn't open \"%s\"\n", path);
+
+ return fd;
+}
+
+static void
+read_header(
+ struct xfs_metablock *mb,
+ FILE *md_fp)
+{
+ mb->mb_magic = cpu_to_be32(XFS_MD_MAGIC_V1);
+
+ if (fread((uint8_t *)mb + sizeof(mb->mb_magic),
+ sizeof(*mb) - sizeof(mb->mb_magic), 1, md_fp) != 1)
+ fatal("error reading from metadump file\n");
+}
+
+static void
+show_info(
+ struct xfs_metablock *mb,
+ const char *md_file)
+{
+ if (mb->mb_info & XFS_METADUMP_INFO_FLAGS) {
+ printf("%s: %sobfuscated, %s log, %s metadata blocks\n",
+ md_file,
+ mb->mb_info & XFS_METADUMP_OBFUSCATED ? "":"not ",
+ mb->mb_info & XFS_METADUMP_DIRTYLOG ? "dirty":"clean",
+ mb->mb_info & XFS_METADUMP_FULLBLOCKS ? "full":"zeroed");
+ } else {
+ printf("%s: no informational flags present\n", md_file);
+ }
+}
+
/*
- * perform_restore() -- do the actual work to restore the metadump
+ * restore() -- do the actual work to restore the metadump
*
* @src_f: A FILE pointer to the source metadump
* @dst_fd: the file descriptor for the target file
@@ -51,9 +115,9 @@ print_progress(const char *fmt, ...)
* src_f should be positioned just past a read the previously validated metablock
*/
static void
-perform_restore(
- FILE *src_f,
- int dst_fd,
+restore(
+ FILE *md_fp,
+ int ddev_fd,
int is_target_file,
const struct xfs_metablock *mbp)
{
@@ -81,14 +145,15 @@ perform_restore(
block_index = (__be64 *)((char *)metablock + sizeof(xfs_metablock_t));
block_buffer = (char *)metablock + block_size;
- if (fread(block_index, block_size - sizeof(struct xfs_metablock), 1, src_f) != 1)
+ if (fread(block_index, block_size - sizeof(struct xfs_metablock), 1,
+ md_fp) != 1)
fatal("error reading from metadump file\n");
if (block_index[0] != 0)
fatal("first block is not the primary superblock\n");
- if (fread(block_buffer, mb_count << mbp->mb_blocklog, 1, src_f) != 1)
+ if (fread(block_buffer, mb_count << mbp->mb_blocklog, 1, md_fp) != 1)
fatal("error reading from metadump file\n");
libxfs_sb_from_disk(&sb, (struct xfs_dsb *)block_buffer);
@@ -111,7 +176,7 @@ perform_restore(
if (is_target_file) {
/* ensure regular files are correctly sized */
- if (ftruncate(dst_fd, sb.sb_dblocks * sb.sb_blocksize))
+ if (ftruncate(ddev_fd, sb.sb_dblocks * sb.sb_blocksize))
fatal("cannot set filesystem image size: %s\n",
strerror(errno));
} else {
@@ -121,7 +186,7 @@ perform_restore(
off64_t off;
off = sb.sb_dblocks * sb.sb_blocksize - sizeof(lb);
- if (pwrite(dst_fd, lb, sizeof(lb), off) < 0)
+ if (pwrite(ddev_fd, lb, sizeof(lb), off) < 0)
fatal("failed to write last block, is target too "
"small? (error: %s)\n", strerror(errno));
}
@@ -134,7 +199,7 @@ perform_restore(
print_progress("%lld MB read", bytes_read >> 20);
for (cur_index = 0; cur_index < mb_count; cur_index++) {
- if (pwrite(dst_fd, &block_buffer[cur_index <<
+ if (pwrite(ddev_fd, &block_buffer[cur_index <<
mbp->mb_blocklog], block_size,
be64_to_cpu(block_index[cur_index]) <<
BBSHIFT) < 0)
@@ -145,7 +210,7 @@ perform_restore(
if (mb_count < max_indices)
break;
- if (fread(metablock, block_size, 1, src_f) != 1)
+ if (fread(metablock, block_size, 1, md_fp) != 1)
fatal("error reading from metadump file\n");
mb_count = be16_to_cpu(metablock->mb_count);
@@ -155,7 +220,7 @@ perform_restore(
fatal("bad block count: %u\n", mb_count);
if (fread(block_buffer, mb_count << mbp->mb_blocklog,
- 1, src_f) != 1)
+ 1, md_fp) != 1)
fatal("error reading from metadump file\n");
bytes_read += block_size + (mb_count << mbp->mb_blocklog);
@@ -172,7 +237,7 @@ perform_restore(
offsetof(struct xfs_sb, sb_crc));
}
- if (pwrite(dst_fd, block_buffer, sb.sb_sectsize, 0) < 0)
+ if (pwrite(ddev_fd, block_buffer, sb.sb_sectsize, 0) < 0)
fatal("error writing primary superblock: %s\n", strerror(errno));
free(metablock);
@@ -185,8 +250,6 @@ usage(void)
exit(1);
}
-extern int platform_check_ismounted(char *, char *, struct stat *, int);
-
int
main(
int argc,
@@ -195,9 +258,7 @@ main(
FILE *src_f;
int dst_fd;
int c;
- int open_flags;
- struct stat statbuf;
- int is_target_file;
+ bool is_target_file;
uint32_t magic;
struct xfs_metablock mb;
@@ -231,8 +292,8 @@ main(
usage();
/*
- * open source and test if this really is a dump. The first metadump block
- * will be passed to perform_restore() which will continue to read the
+ * open source and test if this really is a dump. The first metadump
+ * block will be passed to restore() which will continue to read the
* file from this point. This avoids rewind the stream, which causes
* restore to fail when source was being read from stdin.
*/
@@ -251,11 +312,7 @@ main(
switch (be32_to_cpu(magic)) {
case XFS_MD_MAGIC_V1:
- mb.mb_magic = cpu_to_be32(XFS_MD_MAGIC_V1);
- if (fread((uint8_t *)&mb + sizeof(mb.mb_magic),
- sizeof(mb) - sizeof(mb.mb_magic), 1,
- src_f) != 1)
- fatal("error reading from metadump file\n");
+ read_header(&mb, src_f);
break;
default:
fatal("specified file is not a metadata dump\n");
@@ -263,16 +320,7 @@ main(
}
if (mdrestore.show_info) {
- if (mb.mb_info & XFS_METADUMP_INFO_FLAGS) {
- printf("%s: %sobfuscated, %s log, %s metadata blocks\n",
- argv[optind],
- mb.mb_info & XFS_METADUMP_OBFUSCATED ? "":"not ",
- mb.mb_info & XFS_METADUMP_DIRTYLOG ? "dirty":"clean",
- mb.mb_info & XFS_METADUMP_FULLBLOCKS ? "full":"zeroed");
- } else {
- printf("%s: no informational flags present\n",
- argv[optind]);
- }
+ show_info(&mb, argv[optind]);
if (argc - optind == 1)
exit(0);
@@ -281,30 +329,9 @@ main(
optind++;
/* check and open target */
- open_flags = O_RDWR;
- is_target_file = 0;
- if (stat(argv[optind], &statbuf) < 0) {
- /* ok, assume it's a file and create it */
- open_flags |= O_CREAT;
- is_target_file = 1;
- } else if (S_ISREG(statbuf.st_mode)) {
- open_flags |= O_TRUNC;
- is_target_file = 1;
- } else {
- /*
- * check to make sure a filesystem isn't mounted on the device
- */
- if (platform_check_ismounted(argv[optind], NULL, &statbuf, 0))
- fatal("a filesystem is mounted on target device \"%s\","
- " cannot restore to a mounted filesystem.\n",
- argv[optind]);
- }
-
- dst_fd = open(argv[optind], open_flags, 0644);
- if (dst_fd < 0)
- fatal("couldn't open target \"%s\"\n", argv[optind]);
+ dst_fd = open_device(argv[optind], &is_target_file);
- perform_restore(src_f, dst_fd, is_target_file, &mb);
+ restore(src_f, dst_fd, is_target_file, &mb);
close(dst_fd);
if (src_f != stdin)
--
2.39.1
