| /* |
| * ioctl.c - NILFS ioctl operations. |
| * |
| * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation. |
| * |
| * 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. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| * Written by Koji Sato <koji@osrg.net>. |
| */ |
| |
| #include <linux/fs.h> |
| #include <linux/wait.h> |
| #include <linux/slab.h> |
| #include <linux/capability.h> /* capable() */ |
| #include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */ |
| #include <linux/vmalloc.h> |
| #include <linux/compat.h> /* compat_ptr() */ |
| #include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write() */ |
| #include <linux/buffer_head.h> |
| #include <linux/nilfs2_fs.h> |
| #include "nilfs.h" |
| #include "segment.h" |
| #include "bmap.h" |
| #include "cpfile.h" |
| #include "sufile.h" |
| #include "dat.h" |
| |
| |
| static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs, |
| struct nilfs_argv *argv, int dir, |
| ssize_t (*dofunc)(struct the_nilfs *, |
| __u64 *, int, |
| void *, size_t, size_t)) |
| { |
| void *buf; |
| void __user *base = (void __user *)(unsigned long)argv->v_base; |
| size_t maxmembs, total, n; |
| ssize_t nr; |
| int ret, i; |
| __u64 pos, ppos; |
| |
| if (argv->v_nmembs == 0) |
| return 0; |
| |
| if (argv->v_size > PAGE_SIZE) |
| return -EINVAL; |
| |
| buf = (void *)__get_free_pages(GFP_NOFS, 0); |
| if (unlikely(!buf)) |
| return -ENOMEM; |
| maxmembs = PAGE_SIZE / argv->v_size; |
| |
| ret = 0; |
| total = 0; |
| pos = argv->v_index; |
| for (i = 0; i < argv->v_nmembs; i += n) { |
| n = (argv->v_nmembs - i < maxmembs) ? |
| argv->v_nmembs - i : maxmembs; |
| if ((dir & _IOC_WRITE) && |
| copy_from_user(buf, base + argv->v_size * i, |
| argv->v_size * n)) { |
| ret = -EFAULT; |
| break; |
| } |
| ppos = pos; |
| nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size, |
| n); |
| if (nr < 0) { |
| ret = nr; |
| break; |
| } |
| if ((dir & _IOC_READ) && |
| copy_to_user(base + argv->v_size * i, buf, |
| argv->v_size * nr)) { |
| ret = -EFAULT; |
| break; |
| } |
| total += nr; |
| if ((size_t)nr < n) |
| break; |
| if (pos == ppos) |
| pos += n; |
| } |
| argv->v_nmembs = total; |
| |
| free_pages((unsigned long)buf, 0); |
| return ret; |
| } |
| |
| static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp) |
| { |
| unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE; |
| |
| return put_user(flags, (int __user *)argp); |
| } |
| |
| static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp, |
| void __user *argp) |
| { |
| struct nilfs_transaction_info ti; |
| unsigned int flags, oldflags; |
| int ret; |
| |
| if (!inode_owner_or_capable(inode)) |
| return -EACCES; |
| |
| if (get_user(flags, (int __user *)argp)) |
| return -EFAULT; |
| |
| ret = mnt_want_write_file(filp); |
| if (ret) |
| return ret; |
| |
| flags = nilfs_mask_flags(inode->i_mode, flags); |
| |
| mutex_lock(&inode->i_mutex); |
| |
| oldflags = NILFS_I(inode)->i_flags; |
| |
| /* |
| * The IMMUTABLE and APPEND_ONLY flags can only be changed by the |
| * relevant capability. |
| */ |
| ret = -EPERM; |
| if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) && |
| !capable(CAP_LINUX_IMMUTABLE)) |
| goto out; |
| |
| ret = nilfs_transaction_begin(inode->i_sb, &ti, 0); |
| if (ret) |
| goto out; |
| |
| NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) | |
| (flags & FS_FL_USER_MODIFIABLE); |
| |
| nilfs_set_inode_flags(inode); |
| inode->i_ctime = CURRENT_TIME; |
| if (IS_SYNC(inode)) |
| nilfs_set_transaction_flag(NILFS_TI_SYNC); |
| |
| nilfs_mark_inode_dirty(inode); |
| ret = nilfs_transaction_commit(inode->i_sb); |
| out: |
| mutex_unlock(&inode->i_mutex); |
| mnt_drop_write(filp->f_path.mnt); |
| return ret; |
| } |
| |
| static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp) |
| { |
| return put_user(inode->i_generation, (int __user *)argp); |
| } |
| |
| static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp, |
| unsigned int cmd, void __user *argp) |
| { |
| struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
| struct nilfs_transaction_info ti; |
| struct nilfs_cpmode cpmode; |
| int ret; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| ret = mnt_want_write_file(filp); |
| if (ret) |
| return ret; |
| |
| ret = -EFAULT; |
| if (copy_from_user(&cpmode, argp, sizeof(cpmode))) |
| goto out; |
| |
| down_read(&inode->i_sb->s_umount); |
| |
| nilfs_transaction_begin(inode->i_sb, &ti, 0); |
| ret = nilfs_cpfile_change_cpmode( |
| nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode); |
| if (unlikely(ret < 0)) |
| nilfs_transaction_abort(inode->i_sb); |
| else |
| nilfs_transaction_commit(inode->i_sb); /* never fails */ |
| |
| up_read(&inode->i_sb->s_umount); |
| out: |
| mnt_drop_write(filp->f_path.mnt); |
| return ret; |
| } |
| |
| static int |
| nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp, |
| unsigned int cmd, void __user *argp) |
| { |
| struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
| struct nilfs_transaction_info ti; |
| __u64 cno; |
| int ret; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| ret = mnt_want_write_file(filp); |
| if (ret) |
| return ret; |
| |
| ret = -EFAULT; |
| if (copy_from_user(&cno, argp, sizeof(cno))) |
| goto out; |
| |
| nilfs_transaction_begin(inode->i_sb, &ti, 0); |
| ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno); |
| if (unlikely(ret < 0)) |
| nilfs_transaction_abort(inode->i_sb); |
| else |
| nilfs_transaction_commit(inode->i_sb); /* never fails */ |
| out: |
| mnt_drop_write(filp->f_path.mnt); |
| return ret; |
| } |
| |
| static ssize_t |
| nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
| void *buf, size_t size, size_t nmembs) |
| { |
| int ret; |
| |
| down_read(&nilfs->ns_segctor_sem); |
| ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf, |
| size, nmembs); |
| up_read(&nilfs->ns_segctor_sem); |
| return ret; |
| } |
| |
| static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp, |
| unsigned int cmd, void __user *argp) |
| { |
| struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
| struct nilfs_cpstat cpstat; |
| int ret; |
| |
| down_read(&nilfs->ns_segctor_sem); |
| ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); |
| up_read(&nilfs->ns_segctor_sem); |
| if (ret < 0) |
| return ret; |
| |
| if (copy_to_user(argp, &cpstat, sizeof(cpstat))) |
| ret = -EFAULT; |
| return ret; |
| } |
| |
| static ssize_t |
| nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
| void *buf, size_t size, size_t nmembs) |
| { |
| int ret; |
| |
| down_read(&nilfs->ns_segctor_sem); |
| ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size, |
| nmembs); |
| up_read(&nilfs->ns_segctor_sem); |
| return ret; |
| } |
| |
| static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp, |
| unsigned int cmd, void __user *argp) |
| { |
| struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
| struct nilfs_sustat sustat; |
| int ret; |
| |
| down_read(&nilfs->ns_segctor_sem); |
| ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat); |
| up_read(&nilfs->ns_segctor_sem); |
| if (ret < 0) |
| return ret; |
| |
| if (copy_to_user(argp, &sustat, sizeof(sustat))) |
| ret = -EFAULT; |
| return ret; |
| } |
| |
| static ssize_t |
| nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
| void *buf, size_t size, size_t nmembs) |
| { |
| int ret; |
| |
| down_read(&nilfs->ns_segctor_sem); |
| ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs); |
| up_read(&nilfs->ns_segctor_sem); |
| return ret; |
| } |
| |
| static ssize_t |
| nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags, |
| void *buf, size_t size, size_t nmembs) |
| { |
| struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; |
| struct nilfs_bdesc *bdescs = buf; |
| int ret, i; |
| |
| down_read(&nilfs->ns_segctor_sem); |
| for (i = 0; i < nmembs; i++) { |
| ret = nilfs_bmap_lookup_at_level(bmap, |
| bdescs[i].bd_offset, |
| bdescs[i].bd_level + 1, |
| &bdescs[i].bd_blocknr); |
| if (ret < 0) { |
| if (ret != -ENOENT) { |
| up_read(&nilfs->ns_segctor_sem); |
| return ret; |
| } |
| bdescs[i].bd_blocknr = 0; |
| } |
| } |
| up_read(&nilfs->ns_segctor_sem); |
| return nmembs; |
| } |
| |
| static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp, |
| unsigned int cmd, void __user *argp) |
| { |
| struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
| struct nilfs_argv argv; |
| int ret; |
| |
| if (copy_from_user(&argv, argp, sizeof(argv))) |
| return -EFAULT; |
| |
| if (argv.v_size != sizeof(struct nilfs_bdesc)) |
| return -EINVAL; |
| |
| ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), |
| nilfs_ioctl_do_get_bdescs); |
| if (ret < 0) |
| return ret; |
| |
| if (copy_to_user(argp, &argv, sizeof(argv))) |
| ret = -EFAULT; |
| return ret; |
| } |
| |
| static int nilfs_ioctl_move_inode_block(struct inode *inode, |
| struct nilfs_vdesc *vdesc, |
| struct list_head *buffers) |
| { |
| struct buffer_head *bh; |
| int ret; |
| |
| if (vdesc->vd_flags == 0) |
| ret = nilfs_gccache_submit_read_data( |
| inode, vdesc->vd_offset, vdesc->vd_blocknr, |
| vdesc->vd_vblocknr, &bh); |
| else |
| ret = nilfs_gccache_submit_read_node( |
| inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh); |
| |
| if (unlikely(ret < 0)) { |
| if (ret == -ENOENT) |
| printk(KERN_CRIT |
| "%s: invalid virtual block address (%s): " |
| "ino=%llu, cno=%llu, offset=%llu, " |
| "blocknr=%llu, vblocknr=%llu\n", |
| __func__, vdesc->vd_flags ? "node" : "data", |
| (unsigned long long)vdesc->vd_ino, |
| (unsigned long long)vdesc->vd_cno, |
| (unsigned long long)vdesc->vd_offset, |
| (unsigned long long)vdesc->vd_blocknr, |
| (unsigned long long)vdesc->vd_vblocknr); |
| return ret; |
| } |
| if (unlikely(!list_empty(&bh->b_assoc_buffers))) { |
| printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, " |
| "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n", |
| __func__, vdesc->vd_flags ? "node" : "data", |
| (unsigned long long)vdesc->vd_ino, |
| (unsigned long long)vdesc->vd_cno, |
| (unsigned long long)vdesc->vd_offset, |
| (unsigned long long)vdesc->vd_blocknr, |
| (unsigned long long)vdesc->vd_vblocknr); |
| brelse(bh); |
| return -EEXIST; |
| } |
| list_add_tail(&bh->b_assoc_buffers, buffers); |
| return 0; |
| } |
| |
| static int nilfs_ioctl_move_blocks(struct super_block *sb, |
| struct nilfs_argv *argv, void *buf) |
| { |
| size_t nmembs = argv->v_nmembs; |
| struct the_nilfs *nilfs = sb->s_fs_info; |
| struct inode *inode; |
| struct nilfs_vdesc *vdesc; |
| struct buffer_head *bh, *n; |
| LIST_HEAD(buffers); |
| ino_t ino; |
| __u64 cno; |
| int i, ret; |
| |
| for (i = 0, vdesc = buf; i < nmembs; ) { |
| ino = vdesc->vd_ino; |
| cno = vdesc->vd_cno; |
| inode = nilfs_iget_for_gc(sb, ino, cno); |
| if (IS_ERR(inode)) { |
| ret = PTR_ERR(inode); |
| goto failed; |
| } |
| if (list_empty(&NILFS_I(inode)->i_dirty)) { |
| /* |
| * Add the inode to GC inode list. Garbage Collection |
| * is serialized and no two processes manipulate the |
| * list simultaneously. |
| */ |
| igrab(inode); |
| list_add(&NILFS_I(inode)->i_dirty, |
| &nilfs->ns_gc_inodes); |
| } |
| |
| do { |
| ret = nilfs_ioctl_move_inode_block(inode, vdesc, |
| &buffers); |
| if (unlikely(ret < 0)) { |
| iput(inode); |
| goto failed; |
| } |
| vdesc++; |
| } while (++i < nmembs && |
| vdesc->vd_ino == ino && vdesc->vd_cno == cno); |
| |
| iput(inode); /* The inode still remains in GC inode list */ |
| } |
| |
| list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { |
| ret = nilfs_gccache_wait_and_mark_dirty(bh); |
| if (unlikely(ret < 0)) { |
| WARN_ON(ret == -EEXIST); |
| goto failed; |
| } |
| list_del_init(&bh->b_assoc_buffers); |
| brelse(bh); |
| } |
| return nmembs; |
| |
| failed: |
| list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { |
| list_del_init(&bh->b_assoc_buffers); |
| brelse(bh); |
| } |
| return ret; |
| } |
| |
| static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs, |
| struct nilfs_argv *argv, void *buf) |
| { |
| size_t nmembs = argv->v_nmembs; |
| struct inode *cpfile = nilfs->ns_cpfile; |
| struct nilfs_period *periods = buf; |
| int ret, i; |
| |
| for (i = 0; i < nmembs; i++) { |
| ret = nilfs_cpfile_delete_checkpoints( |
| cpfile, periods[i].p_start, periods[i].p_end); |
| if (ret < 0) |
| return ret; |
| } |
| return nmembs; |
| } |
| |
| static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs, |
| struct nilfs_argv *argv, void *buf) |
| { |
| size_t nmembs = argv->v_nmembs; |
| int ret; |
| |
| ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs); |
| |
| return (ret < 0) ? ret : nmembs; |
| } |
| |
| static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs, |
| struct nilfs_argv *argv, void *buf) |
| { |
| size_t nmembs = argv->v_nmembs; |
| struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; |
| struct nilfs_bdesc *bdescs = buf; |
| int ret, i; |
| |
| for (i = 0; i < nmembs; i++) { |
| /* XXX: use macro or inline func to check liveness */ |
| ret = nilfs_bmap_lookup_at_level(bmap, |
| bdescs[i].bd_offset, |
| bdescs[i].bd_level + 1, |
| &bdescs[i].bd_blocknr); |
| if (ret < 0) { |
| if (ret != -ENOENT) |
| return ret; |
| bdescs[i].bd_blocknr = 0; |
| } |
| if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr) |
| /* skip dead block */ |
| continue; |
| if (bdescs[i].bd_level == 0) { |
| ret = nilfs_mdt_mark_block_dirty(nilfs->ns_dat, |
| bdescs[i].bd_offset); |
| if (ret < 0) { |
| WARN_ON(ret == -ENOENT); |
| return ret; |
| } |
| } else { |
| ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset, |
| bdescs[i].bd_level); |
| if (ret < 0) { |
| WARN_ON(ret == -ENOENT); |
| return ret; |
| } |
| } |
| } |
| return nmembs; |
| } |
| |
| int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs, |
| struct nilfs_argv *argv, void **kbufs) |
| { |
| const char *msg; |
| int ret; |
| |
| ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]); |
| if (ret < 0) { |
| /* |
| * can safely abort because checkpoints can be removed |
| * independently. |
| */ |
| msg = "cannot delete checkpoints"; |
| goto failed; |
| } |
| ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]); |
| if (ret < 0) { |
| /* |
| * can safely abort because DAT file is updated atomically |
| * using a copy-on-write technique. |
| */ |
| msg = "cannot delete virtual blocks from DAT file"; |
| goto failed; |
| } |
| ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]); |
| if (ret < 0) { |
| /* |
| * can safely abort because the operation is nondestructive. |
| */ |
| msg = "cannot mark copying blocks dirty"; |
| goto failed; |
| } |
| return 0; |
| |
| failed: |
| printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n", |
| msg, ret); |
| return ret; |
| } |
| |
| static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, |
| unsigned int cmd, void __user *argp) |
| { |
| struct nilfs_argv argv[5]; |
| static const size_t argsz[5] = { |
| sizeof(struct nilfs_vdesc), |
| sizeof(struct nilfs_period), |
| sizeof(__u64), |
| sizeof(struct nilfs_bdesc), |
| sizeof(__u64), |
| }; |
| void __user *base; |
| void *kbufs[5]; |
| struct the_nilfs *nilfs; |
| size_t len, nsegs; |
| int n, ret; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| ret = mnt_want_write_file(filp); |
| if (ret) |
| return ret; |
| |
| ret = -EFAULT; |
| if (copy_from_user(argv, argp, sizeof(argv))) |
| goto out; |
| |
| ret = -EINVAL; |
| nsegs = argv[4].v_nmembs; |
| if (argv[4].v_size != argsz[4]) |
| goto out; |
| |
| /* |
| * argv[4] points to segment numbers this ioctl cleans. We |
| * use kmalloc() for its buffer because memory used for the |
| * segment numbers is enough small. |
| */ |
| kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base, |
| nsegs * sizeof(__u64)); |
| if (IS_ERR(kbufs[4])) { |
| ret = PTR_ERR(kbufs[4]); |
| goto out; |
| } |
| nilfs = inode->i_sb->s_fs_info; |
| |
| for (n = 0; n < 4; n++) { |
| ret = -EINVAL; |
| if (argv[n].v_size != argsz[n]) |
| goto out_free; |
| |
| if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment) |
| goto out_free; |
| |
| if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size) |
| goto out_free; |
| |
| len = argv[n].v_size * argv[n].v_nmembs; |
| base = (void __user *)(unsigned long)argv[n].v_base; |
| if (len == 0) { |
| kbufs[n] = NULL; |
| continue; |
| } |
| |
| kbufs[n] = vmalloc(len); |
| if (!kbufs[n]) { |
| ret = -ENOMEM; |
| goto out_free; |
| } |
| if (copy_from_user(kbufs[n], base, len)) { |
| ret = -EFAULT; |
| vfree(kbufs[n]); |
| goto out_free; |
| } |
| } |
| |
| /* |
| * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(), |
| * which will operates an inode list without blocking. |
| * To protect the list from concurrent operations, |
| * nilfs_ioctl_move_blocks should be atomic operation. |
| */ |
| if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) { |
| ret = -EBUSY; |
| goto out_free; |
| } |
| |
| vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
| |
| ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]); |
| if (ret < 0) |
| printk(KERN_ERR "NILFS: GC failed during preparation: " |
| "cannot read source blocks: err=%d\n", ret); |
| else |
| ret = nilfs_clean_segments(inode->i_sb, argv, kbufs); |
| |
| nilfs_remove_all_gcinodes(nilfs); |
| clear_nilfs_gc_running(nilfs); |
| |
| out_free: |
| while (--n >= 0) |
| vfree(kbufs[n]); |
| kfree(kbufs[4]); |
| out: |
| mnt_drop_write(filp->f_path.mnt); |
| return ret; |
| } |
| |
| static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, |
| unsigned int cmd, void __user *argp) |
| { |
| __u64 cno; |
| int ret; |
| struct the_nilfs *nilfs; |
| |
| ret = nilfs_construct_segment(inode->i_sb); |
| if (ret < 0) |
| return ret; |
| |
| if (argp != NULL) { |
| nilfs = inode->i_sb->s_fs_info; |
| down_read(&nilfs->ns_segctor_sem); |
| cno = nilfs->ns_cno - 1; |
| up_read(&nilfs->ns_segctor_sem); |
| if (copy_to_user(argp, &cno, sizeof(cno))) |
| return -EFAULT; |
| } |
| 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_file(filp); |
| 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; |
| __u64 range[2]; |
| __u64 minseg, maxseg; |
| unsigned long segbytes; |
| int ret = -EPERM; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| goto out; |
| |
| ret = -EFAULT; |
| if (copy_from_user(range, argp, sizeof(__u64[2]))) |
| goto out; |
| |
| ret = -ERANGE; |
| if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode)) |
| goto out; |
| |
| segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize; |
| |
| minseg = range[0] + segbytes - 1; |
| do_div(minseg, segbytes); |
| maxseg = NILFS_SB2_OFFSET_BYTES(range[1]); |
| do_div(maxseg, segbytes); |
| maxseg--; |
| |
| ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg); |
| out: |
| return ret; |
| } |
| |
| static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp, |
| unsigned int cmd, void __user *argp, |
| size_t membsz, |
| ssize_t (*dofunc)(struct the_nilfs *, |
| __u64 *, int, |
| void *, size_t, size_t)) |
| |
| { |
| struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
| struct nilfs_argv argv; |
| int ret; |
| |
| if (copy_from_user(&argv, argp, sizeof(argv))) |
| return -EFAULT; |
| |
| if (argv.v_size < membsz) |
| return -EINVAL; |
| |
| ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc); |
| if (ret < 0) |
| return ret; |
| |
| if (copy_to_user(argp, &argv, sizeof(argv))) |
| ret = -EFAULT; |
| return ret; |
| } |
| |
| long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| { |
| struct inode *inode = filp->f_dentry->d_inode; |
| void __user *argp = (void __user *)arg; |
| |
| switch (cmd) { |
| case FS_IOC_GETFLAGS: |
| return nilfs_ioctl_getflags(inode, argp); |
| case FS_IOC_SETFLAGS: |
| return nilfs_ioctl_setflags(inode, filp, argp); |
| case FS_IOC_GETVERSION: |
| return nilfs_ioctl_getversion(inode, argp); |
| case NILFS_IOCTL_CHANGE_CPMODE: |
| return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp); |
| case NILFS_IOCTL_DELETE_CHECKPOINT: |
| return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp); |
| case NILFS_IOCTL_GET_CPINFO: |
| return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
| sizeof(struct nilfs_cpinfo), |
| nilfs_ioctl_do_get_cpinfo); |
| case NILFS_IOCTL_GET_CPSTAT: |
| return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp); |
| case NILFS_IOCTL_GET_SUINFO: |
| return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
| sizeof(struct nilfs_suinfo), |
| nilfs_ioctl_do_get_suinfo); |
| case NILFS_IOCTL_GET_SUSTAT: |
| return nilfs_ioctl_get_sustat(inode, filp, cmd, argp); |
| case NILFS_IOCTL_GET_VINFO: |
| return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
| sizeof(struct nilfs_vinfo), |
| nilfs_ioctl_do_get_vinfo); |
| case NILFS_IOCTL_GET_BDESCS: |
| return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp); |
| case NILFS_IOCTL_CLEAN_SEGMENTS: |
| 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: |
| return -ENOTTY; |
| } |
| } |
| |
| #ifdef CONFIG_COMPAT |
| long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| { |
| switch (cmd) { |
| case FS_IOC32_GETFLAGS: |
| cmd = FS_IOC_GETFLAGS; |
| break; |
| case FS_IOC32_SETFLAGS: |
| cmd = FS_IOC_SETFLAGS; |
| break; |
| case FS_IOC32_GETVERSION: |
| cmd = FS_IOC_GETVERSION; |
| break; |
| case NILFS_IOCTL_CHANGE_CPMODE: |
| case NILFS_IOCTL_DELETE_CHECKPOINT: |
| case NILFS_IOCTL_GET_CPINFO: |
| case NILFS_IOCTL_GET_CPSTAT: |
| case NILFS_IOCTL_GET_SUINFO: |
| case NILFS_IOCTL_GET_SUSTAT: |
| case NILFS_IOCTL_GET_VINFO: |
| case NILFS_IOCTL_GET_BDESCS: |
| case NILFS_IOCTL_CLEAN_SEGMENTS: |
| case NILFS_IOCTL_SYNC: |
| case NILFS_IOCTL_RESIZE: |
| case NILFS_IOCTL_SET_ALLOC_RANGE: |
| break; |
| default: |
| return -ENOIOCTLCMD; |
| } |
| return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); |
| } |
| #endif |