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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2011-05-04 18:23:58 +0200 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2011-05-10 15:21:46 +0200 |
| commit | 4e33f9eab07e985282fece4121066c2db1d332ed (patch) | |
| tree | 08161cabc013f0543d65d9c9ed63689f9f68803d /fs/nilfs2/ioctl.c | |
| parent | nilfs2: add truncation routine of segment usage file (diff) | |
| download | linux-4e33f9eab07e985282fece4121066c2db1d332ed.tar.xz linux-4e33f9eab07e985282fece4121066c2db1d332ed.zip | |
nilfs2: implement resize ioctl
This adds resize ioctl which makes online resize possible.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/ioctl.c')
| -rw-r--r-- | fs/nilfs2/ioctl.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c index 6f617773a7f7..41d6743d303c 100644 --- a/fs/nilfs2/ioctl.c +++ b/fs/nilfs2/ioctl.c @@ -698,6 +698,31 @@ static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, return 0; } +static int nilfs_ioctl_resize(struct inode *inode, struct file *filp, + void __user *argp) +{ + __u64 newsize; + int ret = -EPERM; + + if (!capable(CAP_SYS_ADMIN)) + goto out; + + ret = mnt_want_write(filp->f_path.mnt); + if (ret) + goto out; + + ret = -EFAULT; + if (copy_from_user(&newsize, argp, sizeof(newsize))) + goto out_drop_write; + + ret = nilfs_resize_fs(inode->i_sb, newsize); + +out_drop_write: + mnt_drop_write(filp->f_path.mnt); +out: + return ret; +} + static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp) { struct the_nilfs *nilfs = inode->i_sb->s_fs_info; @@ -795,6 +820,8 @@ long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) return nilfs_ioctl_clean_segments(inode, filp, cmd, argp); case NILFS_IOCTL_SYNC: return nilfs_ioctl_sync(inode, filp, cmd, argp); + case NILFS_IOCTL_RESIZE: + return nilfs_ioctl_resize(inode, filp, argp); case NILFS_IOCTL_SET_ALLOC_RANGE: return nilfs_ioctl_set_alloc_range(inode, argp); default: |