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/*
* vmfs-tools - Tools to access VMFS filesystems
* Copyright (C) 2009,2011,2012 Mike Hommey <mh@glandium.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libgen.h>
#include <stdlib.h>
#include <ctype.h>
#include "readcmd.h"
#include "vmfs.h"
/* Until a better API is defined */
int vmfs_bmh_write(const vmfs_bitmap_header_t *bmh,u_char *buf);
static int cmd_remove(vmfs_fs_t *fs,int argc,char *argv[])
{
/* Dangerous */
vmfs_lvm_t *lvm = (vmfs_lvm_t *)fs->dev;
vmfs_volume_t *extent;
DECL_ALIGNED_BUFFER(buf,512);
vmfs_bitmap_entry_t entry;
uint32_t i, blocks_per_segment, items_per_area,
items_in_last_entry, old_area_count;
fprintf(stderr, "Extents removal is experimental ! Use at your own risk !\n");
while (1) {
char *answer = local_readline("Are you sure you want to go further? [y/N] ");
char a = answer[0];
char null = answer[1];
free(answer);
if ((a == 0) || ((tolower(a) == 'n') && (null == 0)))
return(2);
if ((tolower(a) == 'y') && (null == 0))
break;
}
if (lvm->lvm_info.num_extents == 1) {
fprintf(stderr, "Can't remove an extent when there is only one\n");
return(1);
}
/* Get last extent */
extent = lvm->extents[lvm->loaded_extents - 1];
/* Check whether data blocks are used on the last extents */
blocks_per_segment = VMFS_LVM_SEGMENT_SIZE / vmfs_fs_get_blocksize(fs);
for (i = extent->vol_info.first_segment * blocks_per_segment;
i < extent->vol_info.last_segment * blocks_per_segment;
i++)
if (vmfs_block_get_status(fs, VMFS_BLK_FB_BUILD(i, 0))) {
fprintf(stderr, "There is data on the last extent ; can't remove it\n");
return(1);
}
/* At filesystem level, only the FBB needs to be downsized */
fs->fbb->bmh.total_items -= extent->vol_info.num_segments * blocks_per_segment;
items_per_area = fs->fbb->bmh.items_per_bitmap_entry *
fs->fbb->bmh.bmp_entries_per_area;
old_area_count = fs->fbb->bmh.area_count;
fs->fbb->bmh.area_count = (fs->fbb->bmh.total_items + items_per_area - 1) /
items_per_area;
memset(buf, 0, buf_len);
vmfs_bmh_write(&fs->fbb->bmh, buf);
/* TODO: Error handling */
vmfs_file_pwrite(fs->fbb->f, buf, buf_len, 0);
/* Adjust new last entry */
if ((items_in_last_entry =
fs->fbb->bmh.total_items % fs->fbb->bmh.items_per_bitmap_entry)) {
vmfs_bitmap_get_entry(fs->fbb, 0, fs->fbb->bmh.total_items, &entry);
entry.free -= entry.total - items_in_last_entry;
entry.total = items_in_last_entry;
if (entry.ffree > entry.total)
entry.ffree = 0;
/* Adjust bitmap in last entry */
if (items_in_last_entry % 8)
entry.bitmap[items_in_last_entry / 8] &=
0xff << (8 - (items_in_last_entry % 8));
memset(&entry.bitmap[(items_in_last_entry + 7) / 8], 0,
(fs->fbb->bmh.items_per_bitmap_entry - items_in_last_entry - 7) / 8);
vmfs_bme_update(fs, &entry);
}
/* Truncate the fbb file depending on the new area count */
if (old_area_count != fs->fbb->bmh.area_count)
vmfs_file_truncate(fs->fbb->f, fs->fbb->bmh.hdr_size +
fs->fbb->bmh.area_count * fs->fbb->bmh.area_size);
/* Adjust entries after the new last one */
for (i = fs->fbb->bmh.total_items + (items_in_last_entry ?
(fs->fbb->bmh.items_per_bitmap_entry - items_in_last_entry) : 0);
i < fs->fbb->bmh.area_count * items_per_area;
i += fs->fbb->bmh.items_per_bitmap_entry) {
uint64_t pos;
vmfs_bitmap_get_entry(fs->fbb, 0, i, &entry);
pos = entry.mdh.pos;
memset(&entry, 0, sizeof(entry));
vmfs_device_write(fs->dev, pos, (u_char *)&entry, sizeof(entry));
}
/* At LVM level, all extents need to have the LVM information updated */
for (i = 0; i < lvm->loaded_extents - 1; i++) {
lvm->extents[i]->vol_info.blocks -= extent->vol_info.num_segments + 1;
lvm->extents[i]->vol_info.num_extents--;
lvm->extents[i]->vol_info.lvm_size =
(lvm->extents[i]->vol_info.blocks -
lvm->extents[i]->vol_info.num_extents) * VMFS_LVM_SEGMENT_SIZE;
/* Until there is an API for that, do it by hand */
m_pread(lvm->extents[i]->fd,buf,buf_len,
lvm->extents[i]->vmfs_base + VMFS_LVMINFO_OFFSET);
write_le64(buf, VMFS_LVMINFO_OFS_SIZE - VMFS_LVMINFO_OFFSET,
lvm->extents[i]->vol_info.lvm_size);
write_le64(buf, VMFS_LVMINFO_OFS_BLKS - VMFS_LVMINFO_OFFSET,
lvm->extents[i]->vol_info.blocks);
write_le32(buf, VMFS_LVMINFO_OFS_NUM_EXTENTS - VMFS_LVMINFO_OFFSET,
lvm->extents[i]->vol_info.num_extents);
m_pwrite(lvm->extents[i]->fd,buf,buf_len,
lvm->extents[i]->vmfs_base + VMFS_LVMINFO_OFFSET);
}
return(0);
}
struct cmd {
char *name;
char *description;
int (*fn)(vmfs_fs_t *fs,int argc,char *argv[]);
};
struct cmd cmd_array[] = {
{ "remove", "Remove an extent", cmd_remove },
{ NULL, }
};
static void show_usage(char *prog_name)
{
int i;
char *name = basename(prog_name);
fprintf(stderr,"%s " VERSION "\n",name);
fprintf(stderr,"Syntax: %s <device_name...> <command> <args...>\n\n",name);
fprintf(stderr,"Available commands:\n");
for(i=0;cmd_array[i].name;i++)
fprintf(stderr," - %s : %s\n",cmd_array[i].name,cmd_array[i].description);
fprintf(stderr,"\n");
}
static struct cmd *cmd_find(char *name)
{
int i;
for(i=0;cmd_array[i].name;i++)
if (!strcmp(cmd_array[i].name,name))
return(&cmd_array[i]);
return NULL;
}
int main(int argc,char *argv[])
{
vmfs_fs_t *fs;
struct cmd *cmd = NULL;
int arg, ret;
vmfs_flags_t flags;
if (argc < 3) {
show_usage(argv[0]);
return(0);
}
/* Scan arguments for a command */
for (arg = 1; arg < argc; arg++) {
if ((cmd = cmd_find(argv[arg])))
break;
}
if (!cmd) {
show_usage(argv[0]);
return(0);
}
flags.packed = 0;
flags.read_write = 1;
argv[arg] = NULL;
if (!(fs = vmfs_fs_open(&argv[1], flags))) {
fprintf(stderr,"Unable to open filesystem\n");
exit(EXIT_FAILURE);
}
ret = cmd->fn(fs,argc-arg-1,&argv[arg+1]);
vmfs_fs_close(fs);
return(ret);
}
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