[thirdparty/e2fsprogs.git] / resize / online.c

/*
 * 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, 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;
	}

	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 accomodate 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, *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++) {

		overhead = (int) (2 + new_fs->inode_blocks_per_group);

		if (ext2fs_bg_has_super(new_fs, new_fs->group_desc_count - 1))
			overhead += 1 + new_fs->desc_blocks +
				new_fs->super->s_reserved_gdt_blocks;

		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
}
Commit	Line	Data
bf69235a TT	1	/*
	2	* online.c --- Do on-line resizing of the ext3 filesystem
	3	*
efc6f628 TT	4	* Copyright (C) 2006 by Theodore Ts'o
efc6f628 TT	5	*
bf69235a TT	6	* %Begin-Header%
	7	* This file may be redistributed under the terms of the GNU Public
	8	* License.
	9	* %End-Header%
	10	*/
	11
d1154eb4	12	#include "config.h"
bf69235a TT	13	#include "resize2fs.h"
	14	#ifdef HAVE_SYS_IOCTL_H
	15	#include <sys/ioctl.h>
	16	#endif
	17	#include <sys/stat.h>
	18	#include <fcntl.h>
	19
	20	extern char *program_name;
	21
20056960 TT	22	#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
20056960 TT	23
5a760d49 TT	24	#ifdef __linux__
	25	static int parse_version_number(const char *s)
	26	{
	27	int major, minor, rev;
	28	char *endptr;
	29	const char *cp = s;
	30
	31	if (!s)
	32	return 0;
	33	major = strtol(cp, &endptr, 10);
	34	if (cp == endptr \|\| *endptr != '.')
	35	return 0;
	36	cp = endptr + 1;
	37	minor = strtol(cp, &endptr, 10);
	38	if (cp == endptr \|\| *endptr != '.')
	39	return 0;
	40	cp = endptr + 1;
	41	rev = strtol(cp, &endptr, 10);
	42	if (cp == endptr)
	43	return 0;
	44	return ((((major * 256) + minor) * 256) + rev);
	45	}
	46
	47	#define VERSION_CODE(a,b,c) (((a) << 16) + ((b) << 8) + (c))
	48
	49	#endif
	50
efc6f628	51	errcode_t online_resize_fs(ext2_filsys fs, const char *mtpt,
8728d506	52	blk64_t *new_size, int flags EXT2FS_ATTR((unused)))
bf69235a	53	{
3e41608a	54	#ifdef __linux__
bf69235a	55	struct ext2_new_group_input input;
5c4f8d67	56	struct ext4_new_group_input input64;
bf69235a	57	struct ext2_super_block *sb = fs->super;
de8f3a76	58	unsigned long new_desc_blocks;
bf69235a TT	59	ext2_filsys new_fs;
bf69235a TT	60	errcode_t retval;
9ff8ece5	61	double percent;
bf69235a	62	dgrp_t i;
20056960	63	blk_t size;
9ff8ece5	64	int fd, overhead;
5c4f8d67	65	int use_old_ioctl = 1;
5a760d49 TT	66	int no_meta_bg_resize = 0;
	67	int no_resize_ioctl = 0;
	68
	69	if (getenv("RESIZE2FS_KERNEL_VERSION")) {
	70	char *version_to_emulate = getenv("RESIZE2FS_KERNEL_VERSION");
	71	int kvers = parse_version_number(version_to_emulate);
	72
	73	if (kvers < VERSION_CODE(3, 7, 0))
	74	no_meta_bg_resize = 1;
	75	if (kvers < VERSION_CODE(3, 3, 0))
	76	no_resize_ioctl = 1;
	77	}
bf69235a	78
21e37be6	79	if (ext2fs_has_feature_sparse_super2(fs->super) &&
65c6c3e0 TT	80	(access("/sys/fs/ext4/features/sparse_super2", R_OK) != 0)) {
	81	com_err(program_name, 0, _("kernel does not support online "
	82	"resize with sparse_super2"));
	83	exit(1);
	84	}
	85
bf69235a TT	86	printf(_("Filesystem at %s is mounted on %s; "
	87	"on-line resizing required\n"), fs->device_name, mtpt);
	88
4efbac6f	89	if (*new_size < ext2fs_blocks_count(sb)) {
1df56561	90	com_err(program_name, 0, _("On-line shrinking not supported"));
bf69235a TT	91	exit(1);
	92	}
	93
d255b22e	94	/*
efc6f628	95	* If the number of descriptor blocks is going to increase,
d255b22e TT	96	* the on-line resizing inode must be present.
	97	*/
	98	new_desc_blocks = ext2fs_div_ceil(
8728d506 VAH	99	ext2fs_div64_ceil(*new_size -
	100	fs->super->s_first_data_block,
	101	EXT2_BLOCKS_PER_GROUP(fs->super)),
d255b22e	102	EXT2_DESC_PER_BLOCK(fs->super));
9f6ba888	103	printf("old_desc_blocks = %lu, new_desc_blocks = %lu\n",
de8f3a76	104	fs->desc_blocks, new_desc_blocks);
06ca8da7 TT	105
	106	/*
	107	* Do error checking to make sure the resize will be successful.
	108	*/
	109	if ((access("/sys/fs/ext4/features/meta_bg_resize", R_OK) != 0) \|\|
5a760d49	110	no_meta_bg_resize) {
21e37be6	111	if (!ext2fs_has_feature_resize_inode(fs->super) &&
06ca8da7 TT	112	(new_desc_blocks != fs->desc_blocks)) {
	113	com_err(program_name, 0,
	114	_("Filesystem does not support online resizing"));
	115	exit(1);
	116	}
	117
21e37be6	118	if (ext2fs_has_feature_resize_inode(fs->super) &&
06ca8da7 TT	119	new_desc_blocks > (fs->desc_blocks +
	120	fs->super->s_reserved_gdt_blocks)) {
	121	com_err(program_name, 0,
	122	_("Not enough reserved gdt blocks for resizing"));
	123	exit(1);
	124	}
	125
	126	if ((ext2fs_blocks_count(sb) > MAX_32_NUM) \|\|
	127	(*new_size > MAX_32_NUM)) {
	128	com_err(program_name, 0,
	129	_("Kernel does not support resizing a file system this large"));
	130	exit(1);
	131	}
d255b22e TT	132	}
d255b22e TT	133
bf69235a TT	134	fd = open(mtpt, O_RDONLY);
bf69235a TT	135	if (fd < 0) {
efc6f628	136	com_err(program_name, errno,
bf69235a TT	137	_("while trying to open mountpoint %s"), mtpt);
	138	exit(1);
	139	}
	140
5a760d49 TT	141	if (no_resize_ioctl) {
	142	printf(_("Old resize interface requested.\n"));
	143	} else if (ioctl(fd, EXT4_IOC_RESIZE_FS, new_size)) {
cacad7d6 LC	144	/*
	145	* If kernel does not support EXT4_IOC_RESIZE_FS, use the
	146	* old online resize. Note that the old approach does not
	147	* handle >32 bit file systems
3f6fbf95 TT	148	*
	149	* Sigh, if we are running a 32-bit binary on a 64-bit
	150	* kernel (which happens all the time on the MIPS
	151	* architecture in Debian, but can happen on other CPU
	152	* architectures as well) we will get EINVAL returned
	153	* when an ioctl doesn't exist, at least up to Linux
	154	* 3.1. See compat_sys_ioctl() in fs/compat_ioctl.c
	155	* in the kernel sources. This is probably a kernel
	156	* bug, but work around it here.
cacad7d6	157	*/
3f6fbf95	158	if ((errno != ENOTTY) && (errno != EINVAL)) {
9f6ba888 YY	159	if (errno == EPERM)
	160	com_err(program_name, 0,
	161	_("Permission denied to resize filesystem"));
	162	else
	163	com_err(program_name, errno,
	164	_("While checking for on-line resizing "
	165	"support"));
	166	exit(1);
	167	}
	168	} else {
	169	close(fd);
	170	return 0;
	171	}
	172
20056960 TT	173	size = ext2fs_blocks_count(sb);
20056960 TT	174
bf69235a TT	175	if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
bf69235a TT	176	if (errno == EPERM)
efc6f628	177	com_err(program_name, 0,
bf69235a TT	178	_("Permission denied to resize filesystem"));
bf69235a TT	179	else if (errno == ENOTTY)
efc6f628	180	com_err(program_name, 0,
d255b22e	181	_("Kernel does not support online resizing"));
efc6f628 TT	182	else
efc6f628 TT	183	com_err(program_name, errno,
bf69235a TT	184	_("While checking for on-line resizing support"));
	185	exit(1);
	186	}
	187
4efbac6f VAH	188	percent = (ext2fs_r_blocks_count(sb) * 100.0) /
4efbac6f VAH	189	ext2fs_blocks_count(sb);
bf69235a TT	190
bf69235a TT	191	retval = ext2fs_read_bitmaps(fs);
e39082e2 DW	192	if (retval) {
e39082e2 DW	193	close(fd);
bf69235a	194	return retval;
e39082e2	195	}
bf69235a TT	196
bf69235a TT	197	retval = ext2fs_dup_handle(fs, &new_fs);
e39082e2 DW	198	if (retval) {
e39082e2 DW	199	close(fd);
bf69235a	200	return retval;
e39082e2	201	}
bf69235a	202
f844b32a TT	203	/* The current method of adding one block group at a time to a
	204	* mounted filesystem means it is impossible to accomodate the
	205	* flex_bg allocation method of placing the metadata together
	206	* in a single block group. For now we "fix" this issue by
	207	* using the traditional layout for new block groups, where
	208	* each block group is self-contained and contains its own
	209	* bitmap blocks and inode tables. This means we don't get
	210	* the layout advantages of flex_bg in the new block groups,
	211	* but at least it allows on-line resizing to function.
	212	*/
21e37be6	213	ext2fs_clear_feature_flex_bg(new_fs->super);
c09043f1	214	retval = adjust_fs_info(new_fs, fs, 0, *new_size);
e39082e2 DW	215	if (retval) {
e39082e2 DW	216	close(fd);
bf69235a	217	return retval;
e39082e2	218	}
bf69235a	219
8728d506	220	printf(_("Performing an on-line resize of %s to %llu (%dk) blocks.\n"),
bf69235a TT	221	fs->device_name, *new_size, fs->blocksize / 1024);
bf69235a TT	222
efc6f628	223	size = fs->group_desc_count * sb->s_blocks_per_group +
bf69235a TT	224	sb->s_first_data_block;
	225	if (size > *new_size)
	226	size = *new_size;
	227
	228	if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
efc6f628	229	com_err(program_name, errno,
bf69235a TT	230	_("While trying to extend the last group"));
	231	exit(1);
	232	}
	233
	234	for (i = fs->group_desc_count;
	235	i < new_fs->group_desc_count; i++) {
	236
	237	overhead = (int) (2 + new_fs->inode_blocks_per_group);
	238
	239	if (ext2fs_bg_has_super(new_fs, new_fs->group_desc_count - 1))
efc6f628	240	overhead += 1 + new_fs->desc_blocks +
bf69235a TT	241	new_fs->super->s_reserved_gdt_blocks;
	242
	243	input.group = i;
d7cca6b0 VAH	244	input.block_bitmap = ext2fs_block_bitmap_loc(new_fs, i);
	245	input.inode_bitmap = ext2fs_inode_bitmap_loc(new_fs, i);
	246	input.inode_table = ext2fs_inode_table_loc(new_fs, i);
98f45471	247	input.blocks_count = ext2fs_group_blocks_count(new_fs, i);
9ff8ece5 TT	248	input.reserved_blocks = (blk_t) (percent * input.blocks_count
9ff8ece5 TT	249	/ 100.0);
bf69235a TT	250
	251	#if 0
	252	printf("new block bitmap is at 0x%04x\n", input.block_bitmap);
	253	printf("new inode bitmap is at 0x%04x\n", input.inode_bitmap);
efc6f628	254	printf("new inode table is at 0x%04x-0x%04x\n",
bf69235a TT	255	input.inode_table,
bf69235a TT	256	input.inode_table + new_fs->inode_blocks_per_group-1);
d0ff90d5	257	printf("new group has %u blocks\n", input.blocks_count);
efc6f628	258	printf("new group will reserve %d blocks\n",
bf69235a	259	input.reserved_blocks);
efc6f628	260	printf("new group has %d free blocks\n",
d7cca6b0	261	ext2fs_bg_free_blocks_count(new_fs, i),
bf69235a	262	printf("new group has %d free inodes (%d blocks)\n",
d7cca6b0	263	ext2fs_bg_free_inodes_count(new_fs, i),
bf69235a TT	264	new_fs->inode_blocks_per_group);
	265	printf("Adding group #%d\n", input.group);
	266	#endif
	267
5c4f8d67 TT	268	if (use_old_ioctl &&
	269	ioctl(fd, EXT2_IOC_GROUP_ADD, &input) == 0)
	270	continue;
	271	else
f844b32a	272	use_old_ioctl = 0;
5c4f8d67 TT	273
	274	input64.group = input.group;
	275	input64.block_bitmap = input.block_bitmap;
	276	input64.inode_bitmap = input.inode_bitmap;
	277	input64.inode_table = input.inode_table;
	278	input64.blocks_count = input.blocks_count;
	279	input64.reserved_blocks = input.reserved_blocks;
	280	input64.unused = input.unused;
	281
	282	if (ioctl(fd, EXT4_IOC_GROUP_ADD, &input64) < 0) {
efc6f628 TT	283	com_err(program_name, errno,
efc6f628 TT	284	_("While trying to add group #%d"),
bf69235a TT	285	input.group);
	286	exit(1);
	287	}
	288	}
	289
	290	ext2fs_free(new_fs);
	291	close(fd);
	292
	293	return 0;
3e41608a	294	#else
df9c01b1	295	printf(_("Filesystem at %s is mounted on %s, and on-line resizing is "
3e41608a ST	296	"not supported on this system.\n"), fs->device_name, mtpt);
	297	exit(1);
	298	#endif
bf69235a	299	}