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Btrfs: Make the resizer work based on shrinking and growing devices

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-25 16:53:30 -04:00
parent 5e478dc982
commit 8f18cf1339
6 changed files with 407 additions and 108 deletions
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36
fs/btrfs/inode.c
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@@ -16,6 +16,7 @@
* Boston, MA 021110-1307, USA.
*/
#include <linux/kernel.h>
#include <linux/bio.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
@@ -2887,9 +2888,12 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
{
u64 new_size;
u64 old_size;
u64 devid = 1;
struct btrfs_ioctl_vol_args *vol_args;
struct btrfs_trans_handle *trans;
struct btrfs_device *device = NULL;
char *sizestr;
char *devstr = NULL;
int ret = 0;
int namelen;
int mod = 0;
@@ -2909,9 +2913,25 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
goto out;
}
mutex_lock(&root->fs_info->fs_mutex);
sizestr = vol_args->name;
devstr = strchr(sizestr, ':');
if (devstr) {
char *end;
sizestr = devstr + 1;
*devstr = '\0';
devstr = vol_args->name;
devid = simple_strtoull(devstr, &end, 10);
printk("resizing devid %Lu\n", devid);
}
device = btrfs_find_device(root, devid, NULL);
if (!device) {
printk("resizer unable to find device %Lu\n", devid);
ret = -EINVAL;
goto out_unlock;
}
if (!strcmp(sizestr, "max"))
new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
new_size = device->bdev->bd_inode->i_size;
else {
if (sizestr[0] == '-') {
mod = -1;
@@ -2923,12 +2943,11 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
new_size = btrfs_parse_size(sizestr);
if (new_size == 0) {
ret = -EINVAL;
goto out;
goto out_unlock;
}
}
mutex_lock(&root->fs_info->fs_mutex);
old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
old_size = device->total_bytes;
if (mod < 0) {
if (new_size > old_size) {
@@ -2944,7 +2963,7 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
ret = -EINVAL;
goto out_unlock;
}
if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
if (new_size > device->bdev->bd_inode->i_size) {
ret = -EFBIG;
goto out_unlock;
}
@@ -2952,13 +2971,14 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
do_div(new_size, root->sectorsize);
new_size *= root->sectorsize;
printk("new size is %Lu\n", new_size);
printk("new size for %s is %llu\n", device->name, (unsigned long long)new_size);
if (new_size > old_size) {
trans = btrfs_start_transaction(root, 1);
ret = btrfs_grow_extent_tree(trans, root, new_size);
ret = btrfs_grow_device(trans, device, new_size);
btrfs_commit_transaction(trans, root);
} else {
ret = btrfs_shrink_extent_tree(root, new_size);
ret = btrfs_shrink_device(device, new_size);
}
out_unlock: