extern char *program_name;
+#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
+
+#ifdef __linux__
+static int parse_version_number(const char *s)
+{
+ int major, minor, rev;
+ char *endptr;
+ const char *cp = s;
+
+ if (!s)
+ return 0;
+ major = strtol(cp, &endptr, 10);
+ if (cp == endptr || *endptr != '.')
+ return 0;
+ cp = endptr + 1;
+ minor = strtol(cp, &endptr, 10);
+ if (cp == endptr || *endptr != '.')
+ return 0;
+ cp = endptr + 1;
+ rev = strtol(cp, &endptr, 10);
+ if (cp == endptr)
+ return 0;
+ return ((((major * 256) + minor) * 256) + rev);
+}
+
+#define VERSION_CODE(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+
+#endif
+
errcode_t online_resize_fs(ext2_filsys fs, const char *mtpt,
blk64_t *new_size, int flags EXT2FS_ATTR((unused)))
{
errcode_t retval;
double percent;
dgrp_t i;
- blk64_t size;
+ blk_t size;
int fd, overhead;
int use_old_ioctl = 1;
+ int no_meta_bg_resize = 0;
+ int no_resize_ioctl = 0;
+
+ if (getenv("RESIZE2FS_KERNEL_VERSION")) {
+ char *version_to_emulate = getenv("RESIZE2FS_KERNEL_VERSION");
+ int kvers = parse_version_number(version_to_emulate);
+
+ if (kvers < VERSION_CODE(3, 7, 0))
+ no_meta_bg_resize = 1;
+ if (kvers < VERSION_CODE(3, 3, 0))
+ no_resize_ioctl = 1;
+ }
printf(_("Filesystem at %s is mounted on %s; "
"on-line resizing required\n"), fs->device_name, mtpt);
fs->super->s_first_data_block,
EXT2_BLOCKS_PER_GROUP(fs->super)),
EXT2_DESC_PER_BLOCK(fs->super));
- printf("old desc_blocks = %lu, new_desc_blocks = %lu\n",
+ printf("old_desc_blocks = %lu, new_desc_blocks = %lu\n",
fs->desc_blocks, new_desc_blocks);
- if (!(fs->super->s_feature_compat &
- EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
- new_desc_blocks != fs->desc_blocks) {
- com_err(program_name, 0,
- _("Filesystem does not support online resizing"));
- exit(1);
+
+ /*
+ * Do error checking to make sure the resize will be successful.
+ */
+ if ((access("/sys/fs/ext4/features/meta_bg_resize", R_OK) != 0) ||
+ no_meta_bg_resize) {
+ if (!EXT2_HAS_COMPAT_FEATURE(fs->super,
+ EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
+ (new_desc_blocks != fs->desc_blocks)) {
+ com_err(program_name, 0,
+ _("Filesystem does not support online resizing"));
+ exit(1);
+ }
+
+ if (EXT2_HAS_COMPAT_FEATURE(fs->super,
+ EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
+ new_desc_blocks > (fs->desc_blocks +
+ fs->super->s_reserved_gdt_blocks)) {
+ com_err(program_name, 0,
+ _("Not enough reserved gdt blocks for resizing"));
+ exit(1);
+ }
+
+ if ((ext2fs_blocks_count(sb) > MAX_32_NUM) ||
+ (*new_size > MAX_32_NUM)) {
+ com_err(program_name, 0,
+ _("Kernel does not support resizing a file system this large"));
+ exit(1);
+ }
}
fd = open(mtpt, O_RDONLY);
exit(1);
}
- size=ext2fs_blocks_count(sb);
+ if (no_resize_ioctl) {
+ printf(_("Old resize interface requested.\n"));
+ } else if (ioctl(fd, EXT4_IOC_RESIZE_FS, new_size)) {
+ /*
+ * If kernel does not support EXT4_IOC_RESIZE_FS, use the
+ * old online resize. Note that the old approach does not
+ * handle >32 bit file systems
+ *
+ * Sigh, if we are running a 32-bit binary on a 64-bit
+ * kernel (which happens all the time on the MIPS
+ * architecture in Debian, but can happen on other CPU
+ * architectures as well) we will get EINVAL returned
+ * when an ioctl doesn't exist, at least up to Linux
+ * 3.1. See compat_sys_ioctl() in fs/compat_ioctl.c
+ * in the kernel sources. This is probably a kernel
+ * bug, but work around it here.
+ */
+ if ((errno != ENOTTY) && (errno != EINVAL)) {
+ if (errno == EPERM)
+ com_err(program_name, 0,
+ _("Permission denied to resize filesystem"));
+ else
+ com_err(program_name, errno,
+ _("While checking for on-line resizing "
+ "support"));
+ exit(1);
+ }
+ } else {
+ close(fd);
+ return 0;
+ }
+
+ size = ext2fs_blocks_count(sb);
+
if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
if (errno == EPERM)
com_err(program_name, 0,
ext2fs_blocks_count(sb);
retval = ext2fs_read_bitmaps(fs);
- if (retval)
+ if (retval) {
+ close(fd);
return retval;
+ }
retval = ext2fs_dup_handle(fs, &new_fs);
- if (retval)
+ if (retval) {
+ close(fd);
return retval;
+ }
/* The current method of adding one block group at a time to a
* mounted filesystem means it is impossible to accomodate the
*/
new_fs->super->s_feature_incompat &= ~EXT4_FEATURE_INCOMPAT_FLEX_BG;
retval = adjust_fs_info(new_fs, fs, 0, *new_size);
- if (retval)
+ if (retval) {
+ close(fd);
return retval;
+ }
printf(_("Performing an on-line resize of %s to %llu (%dk) blocks.\n"),
fs->device_name, *new_size, fs->blocksize / 1024);
input.block_bitmap = ext2fs_block_bitmap_loc(new_fs, i);
input.inode_bitmap = ext2fs_inode_bitmap_loc(new_fs, i);
input.inode_table = ext2fs_inode_table_loc(new_fs, i);
- input.blocks_count = sb->s_blocks_per_group;
- if (i == new_fs->group_desc_count-1) {
- input.blocks_count = ext2fs_blocks_count(new_fs->super) -
- sb->s_first_data_block -
- (i * sb->s_blocks_per_group);
- }
+ input.blocks_count = ext2fs_group_blocks_count(new_fs, i);
input.reserved_blocks = (blk_t) (percent * input.blocks_count
/ 100.0);
OSDN Git Service
