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Btrfs: add btrfs_trim_fs() to handle FITRIM

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We take an free extent out from allocator, trim it, then put it back,
but before we trim the block group, we should make sure the block group is
cached, so plus a little change to make cache_block_group() run without a
transaction.

Signed-off-by: Li Dongyang <lidongyang@novell.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Li Dongyang
2011-03-24 10:24:28 +00:00
committed by root
parent 5378e60734
commit f7039b1d5c
5 changed files with 190 additions and 1 deletions
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46
fs/btrfs/ioctl.c
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@@ -40,6 +40,7 @@
#include <linux/xattr.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
@@ -258,6 +259,49 @@ static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
return put_user(inode->i_generation, arg);
}
static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
{
struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info;
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_device *device;
struct request_queue *q;
struct fstrim_range range;
u64 minlen = ULLONG_MAX;
u64 num_devices = 0;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
mutex_lock(&fs_info->fs_devices->device_list_mutex);
list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
if (!device->bdev)
continue;
q = bdev_get_queue(device->bdev);
if (blk_queue_discard(q)) {
num_devices++;
minlen = min((u64)q->limits.discard_granularity,
minlen);
}
}
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
if (!num_devices)
return -EOPNOTSUPP;
if (copy_from_user(&range, arg, sizeof(range)))
return -EFAULT;
range.minlen = max(range.minlen, minlen);
ret = btrfs_trim_fs(root, &range);
if (ret < 0)
return ret;
if (copy_to_user(arg, &range, sizeof(range)))
return -EFAULT;
return 0;
}
static noinline int create_subvol(struct btrfs_root *root,
struct dentry *dentry,
char *name, int namelen,
@@ -2426,6 +2470,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_setflags(file, argp);
case FS_IOC_GETVERSION:
return btrfs_ioctl_getversion(file, argp);
case FITRIM:
return btrfs_ioctl_fitrim(file, argp);
case BTRFS_IOC_SNAP_CREATE:
return btrfs_ioctl_snap_create(file, argp, 0);
case BTRFS_IOC_SNAP_CREATE_V2: