Adding upstream version 1.47.0.upstream/1.47.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 293 insertions, 0 deletions

diff --git a/resize/online.c b/resize/online.c
new file mode 100644
index 0000000..eef7c0b
--- /dev/null
+++ b/resize/online.c
@@ -0,0 +1,293 @@
+/*
+ * online.c --- Do on-line resizing of the ext3 filesystem
+ *
+ * Copyright (C) 2006 by Theodore Ts'o
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include "resize2fs.h"
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+#include <sys/stat.h>
+#include <fcntl.h>
+
+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)))
+{
+#ifdef __linux__
+	struct ext2_new_group_input input;
+	struct ext4_new_group_input input64;
+	struct ext2_super_block *sb = fs->super;
+	unsigned long		new_desc_blocks;
+	ext2_filsys 		new_fs;
+	errcode_t 		retval;
+	double			percent;
+	dgrp_t			i;
+	blk_t			size;
+	int			fd;
+	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;
+	}
+
+	if (ext2fs_has_feature_sparse_super2(fs->super) &&
+	    (access("/sys/fs/ext4/features/sparse_super2", R_OK) != 0)) {
+		com_err(program_name, 0, _("kernel does not support online "
+					   "resize with sparse_super2"));
+		exit(1);
+	}
+
+	printf(_("Filesystem at %s is mounted on %s; "
+		 "on-line resizing required\n"), fs->device_name, mtpt);
+
+	if (*new_size < ext2fs_blocks_count(sb)) {
+		com_err(program_name, 0, _("On-line shrinking not supported"));
+		exit(1);
+	}
+
+	/*
+	 * If the number of descriptor blocks is going to increase,
+	 * the on-line resizing inode must be present.
+	 */
+	new_desc_blocks = ext2fs_div_ceil(
+		ext2fs_div64_ceil(*new_size -
+				  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",
+	       fs->desc_blocks, new_desc_blocks);
+
+	/*
+	 * 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 (!ext2fs_has_feature_resize_inode(fs->super) &&
+		    (new_desc_blocks != fs->desc_blocks)) {
+			com_err(program_name, 0,
+				_("Filesystem does not support online resizing"));
+			exit(1);
+		}
+
+		if (ext2fs_has_feature_resize_inode(fs->super) &&
+		    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);
+	if (fd < 0) {
+		com_err(program_name, errno,
+			_("while trying to open mountpoint %s"), mtpt);
+		exit(1);
+	}
+
+	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,
+				_("Permission denied to resize filesystem"));
+		else if (errno == ENOTTY)
+			com_err(program_name, 0,
+			_("Kernel does not support online resizing"));
+		else
+			com_err(program_name, errno,
+			_("While checking for on-line resizing support"));
+		exit(1);
+	}
+
+	percent = (ext2fs_r_blocks_count(sb) * 100.0) /
+		ext2fs_blocks_count(sb);
+
+	retval = ext2fs_read_bitmaps(fs);
+	if (retval) {
+		close(fd);
+		return retval;
+	}
+
+	retval = ext2fs_dup_handle(fs, &new_fs);
+	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 accommodate the
+	 * flex_bg allocation method of placing the metadata together
+	 * in a single block group.  For now we "fix" this issue by
+	 * using the traditional layout for new block groups, where
+	 * each block group is self-contained and contains its own
+	 * bitmap blocks and inode tables.  This means we don't get
+	 * the layout advantages of flex_bg in the new block groups,
+	 * but at least it allows on-line resizing to function.
+	 */
+	ext2fs_clear_feature_flex_bg(new_fs->super);
+	retval = adjust_fs_info(new_fs, fs, 0, *new_size);
+	if (retval) {
+		close(fd);
+		return retval;
+	}
+
+	printf(_("Performing an on-line resize of %s to %llu (%dk) blocks.\n"),
+	       fs->device_name, (unsigned long long) *new_size,
+	       fs->blocksize / 1024);
+
+	size = fs->group_desc_count * sb->s_blocks_per_group +
+		sb->s_first_data_block;
+	if (size > *new_size)
+		size = *new_size;
+
+	if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
+		com_err(program_name, errno,
+			_("While trying to extend the last group"));
+		exit(1);
+	}
+
+	for (i = fs->group_desc_count;
+	     i < new_fs->group_desc_count; i++) {
+		input.group = i;
+		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 = ext2fs_group_blocks_count(new_fs, i);
+		input.reserved_blocks = (blk_t) (percent * input.blocks_count
+						 / 100.0);
+
+#if 0
+		printf("new block bitmap is at 0x%04x\n", input.block_bitmap);
+		printf("new inode bitmap is at 0x%04x\n", input.inode_bitmap);
+		printf("new inode table is at 0x%04x-0x%04x\n",
+		       input.inode_table,
+		       input.inode_table + new_fs->inode_blocks_per_group-1);
+		printf("new group has %u blocks\n", input.blocks_count);
+		printf("new group will reserve %d blocks\n",
+		       input.reserved_blocks);
+		printf("new group has %d free blocks\n",
+		       ext2fs_bg_free_blocks_count(new_fs, i),
+		printf("new group has %d free inodes (%d blocks)\n",
+		       ext2fs_bg_free_inodes_count(new_fs, i),
+		       new_fs->inode_blocks_per_group);
+		printf("Adding group #%d\n", input.group);
+#endif
+
+		if (use_old_ioctl &&
+		    ioctl(fd, EXT2_IOC_GROUP_ADD, &input) == 0)
+			continue;
+		else
+			use_old_ioctl = 0;
+
+		input64.group = input.group;
+		input64.block_bitmap = input.block_bitmap;
+		input64.inode_bitmap = input.inode_bitmap;
+		input64.inode_table = input.inode_table;
+		input64.blocks_count = input.blocks_count;
+		input64.reserved_blocks = input.reserved_blocks;
+		input64.unused = input.unused;
+
+		if (ioctl(fd, EXT4_IOC_GROUP_ADD, &input64) < 0) {
+			com_err(program_name, errno,
+				_("While trying to add group #%d"),
+				input.group);
+			exit(1);
+		}
+	}
+
+	ext2fs_free(new_fs);
+	close(fd);
+
+	return 0;
+#else
+	printf(_("Filesystem at %s is mounted on %s, and on-line resizing is "
+		 "not supported on this system.\n"), fs->device_name, mtpt);
+	exit(1);
+#endif
+}