/* * 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. * * Written by Koji Sato. */ #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_file() */ #include <linux/buffer_head.h> #include "nilfs.h" #include "segment.h" #include "bmap.h" #include "cpfile.h" #include "sufile.h" #include "dat.h" /** * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info * @nilfs: nilfs object * @argv: vector of arguments from userspace * @dir: set of direction flags * @dofunc: concrete function of get/set metadata info * * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of * calling dofunc() function on the basis of @argv argument. * * Return Value: On success, 0 is returned and requested metadata info * is copied into userspace. On error, one of the following * negative error codes is returned. * * %-EINVAL - Invalid arguments from userspace. * * %-ENOMEM - Insufficient amount of memory available. * * %-EFAULT - Failure during execution of requested operation. */ 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; /* * Reject pairs of a start item position (argv->v_index) and a * total count (argv->v_nmembs) which leads position 'pos' to * overflow by the increment at the end of the loop. */ if (argv->v_index > ~(__u64)0 - argv->v_nmembs) 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; } /** * nilfs_ioctl_getflags - ioctl to support lsattr */ 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); } /** * nilfs_ioctl_setflags - ioctl to support chattr */ 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); inode_lock(inode); 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(inode); if (IS_SYNC(inode)) nilfs_set_transaction_flag(NILFS_TI_SYNC); nilfs_mark_inode_dirty(inode); ret = nilfs_transaction_commit(inode->i_sb); out: inode_unlock(inode); mnt_drop_write_file(filp); return ret; } /** * nilfs_ioctl_getversion - get info about a file's version (generation number) */ static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp) { return put_user(inode->i_generation, (int __user *)argp); } /** * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot) * @inode: inode object * @filp: file object * @cmd: ioctl's request code * @argp: pointer on argument from userspace * * Description: nilfs_ioctl_change_cpmode() function changes mode of * given checkpoint between checkpoint and snapshot state. This ioctl * is used in chcp and mkcp utilities. * * Return Value: On success, 0 is returned and mode of a checkpoint is * changed. On error, one of the following negative error codes * is returned. * * %-EPERM - Operation not permitted. * * %-EFAULT - Failure during checkpoint mode changing. */ 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; mutex_lock(&nilfs->ns_snapshot_mount_mutex); 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 */ mutex_unlock(&nilfs->ns_snapshot_mount_mutex); out: mnt_drop_write_file(filp); return ret; } /** * nilfs_ioctl_delete_checkpoint - remove checkpoint * @inode: inode object * @filp: file object * @cmd: ioctl's request code * @argp: pointer on argument from userspace * * Description: nilfs_ioctl_delete_checkpoint() function removes * checkpoint from NILFS2 file system. This ioctl is used in rmcp * utility. * * Return Value: On success, 0 is returned and a checkpoint is * removed. On error, one of the following negative error codes * is returned. * * %-EPERM - Operation not permitted. * * %-EFAULT - Failure during checkpoint removing. */ 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_file(filp); return ret; } /** * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints * @nilfs: nilfs object * @posp: pointer on array of checkpoint's numbers * @flags: checkpoint mode (checkpoint or snapshot) * @buf: buffer for storing checkponts' info * @size: size in bytes of one checkpoint info item in array * @nmembs: number of checkpoints in array (numbers and infos) * * Description: nilfs_ioctl_do_get_cpinfo() function returns info about * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in * lscp utility and by nilfs_cleanerd daemon. * * Return value: count of nilfs_cpinfo structures in output buffer. */ 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; } /** * nilfs_ioctl_get_cpstat - get checkpoints statistics * @inode: inode object * @filp: file object * @cmd: ioctl's request code * @argp: pointer on argument from userspace * * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints. * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities * and by nilfs_cleanerd daemon. * * Return Value: On success, 0 is returned, and checkpoints information is * copied into userspace pointer @argp. On error, one of the following * negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-EFAULT - Failure during getting checkpoints statistics. */ 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; } /** * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info * @nilfs: nilfs object * @posp: pointer on array of segment numbers * @flags: *not used* * @buf: buffer for storing suinfo array * @size: size in bytes of one suinfo item in array * @nmembs: count of segment numbers and suinfos in array * * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon. * * Return value: count of nilfs_suinfo structures in output buffer. */ 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; } /** * nilfs_ioctl_get_sustat - get segment usage statistics * @inode: inode object * @filp: file object * @cmd: ioctl's request code * @argp: pointer on argument from userspace * * Description: nilfs_ioctl_get_sustat() returns segment usage statistics. * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities * and by nilfs_cleanerd daemon. * * Return Value: On success, 0 is returned, and segment usage information is * copied into userspace pointer @argp. On error, one of the following * negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-EFAULT - Failure during getting segment usage statistics. */ 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; } /** * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info * @nilfs: nilfs object * @posp: *not used* * @flags: *not used* * @buf: buffer for storing array of nilfs_vinfo structures * @size: size in bytes of one vinfo item in array * @nmembs: count of vinfos in array * * Description: nilfs_ioctl_do_get_vinfo() function returns information * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used * by nilfs_cleanerd daemon. * * Return value: count of nilfs_vinfo structures in output buffer. */ 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; } /** * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors * @nilfs: nilfs object * @posp: *not used* * @flags: *not used* * @buf: buffer for storing array of nilfs_bdesc structures * @size: size in bytes of one bdesc item in array * @nmembs: count of bdescs in array * * Description: nilfs_ioctl_do_get_bdescs() function returns information * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl * is used by nilfs_cleanerd daemon. * * Return value: count of nilfs_bdescs structures in output buffer. */ 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; } /** * nilfs_ioctl_get_bdescs - get disk block descriptors * @inode: inode object * @filp: file object * @cmd: ioctl's request code * @argp: pointer on argument from userspace * * Description: nilfs_ioctl_do_get_bdescs() function returns information * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl * is used by nilfs_cleanerd daemon. * * Return Value: On success, 0 is returned, and disk block descriptors are * copied into userspace pointer @argp. On error, one of the following * negative error codes is returned. * * %-EINVAL - Invalid arguments from userspace. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-EFAULT - Failure during getting disk block descriptors. */ 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; } /** * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC * @inode: inode object * @vdesc: descriptor of virtual block number * @buffers: list of moving buffers * * Description: nilfs_ioctl_move_inode_block() function registers data/node * buffer in the GC pagecache and submit read request. * * Return Value: On success, 0 is returned. On error, one of the following * negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-ENOENT - Requested block doesn't exist. * * %-EEXIST - Blocks conflict is detected. */ 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) nilfs_msg(inode->i_sb, KERN_CRIT, "%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu", __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))) { nilfs_msg(inode->i_sb, KERN_CRIT, "%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu", __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; } /** * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection * @sb: superblock object * @argv: vector of arguments from userspace * @buf: array of nilfs_vdesc structures * * Description: nilfs_ioctl_move_blocks() function reads valid data/node * blocks that garbage collector specified with the array of nilfs_vdesc * structures and stores them into page caches of GC inodes. * * Return Value: Number of processed nilfs_vdesc structures or * error code, otherwise. */ 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; } /** * nilfs_ioctl_delete_checkpoints - delete checkpoints * @nilfs: nilfs object * @argv: vector of arguments from userspace * @buf: array of periods of checkpoints numbers * * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints * in the period from p_start to p_end, excluding p_end itself. The checkpoints * which have been already deleted are ignored. * * Return Value: Number of processed nilfs_period structures or * error code, otherwise. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-EINVAL - invalid checkpoints. */ 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; } /** * nilfs_ioctl_free_vblocknrs - free virtual block numbers * @nilfs: nilfs object * @argv: vector of arguments from userspace * @buf: array of virtual block numbers * * Description: nilfs_ioctl_free_vblocknrs() function frees * the virtual block numbers specified by @buf and @argv->v_nmembs. * * Return Value: Number of processed virtual block numbers or * error code, otherwise. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-ENOENT - The virtual block number have not been allocated. */ 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; } /** * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty * @nilfs: nilfs object * @argv: vector of arguments from userspace * @buf: array of block descriptors * * Description: nilfs_ioctl_mark_blocks_dirty() function marks * metadata file or data blocks as dirty. * * Return Value: Number of processed block descriptors or * error code, otherwise. * * %-ENOMEM - Insufficient memory available. * * %-EIO - I/O error * * %-ENOENT - the specified block does not exist (hole block) */ 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; struct buffer_head *bh; 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_get_block(nilfs->ns_dat, bdescs[i].bd_offset, false, NULL, &bh); if (unlikely(ret)) { WARN_ON(ret == -ENOENT); return ret; } mark_buffer_dirty(bh); nilfs_mdt_mark_dirty(nilfs->ns_dat); put_bh(bh); } 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: nilfs_msg(nilfs->ns_sb, KERN_ERR, "error %d preparing GC: %s", ret, msg); return ret; } /** * nilfs_ioctl_clean_segments - clean segments * @inode: inode object * @filp: file object * @cmd: ioctl's request code * @argp: pointer on argument from userspace * * Description: nilfs_ioctl_clean_segments() function makes garbage * collection operation in the environment of requested parameters * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by * nilfs_cleanerd daemon. * * Return Value: On success, 0 is returned or error code, otherwise. */ 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; if (nsegs > UINT_MAX / sizeof(__u64)) 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; } ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]); if (ret < 0) { nilfs_msg(inode->i_sb, KERN_ERR, "error %d preparing GC: cannot read source blocks", ret); } else { if (nilfs_sb_need_update(nilfs)) set_nilfs_discontinued(nilfs); 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_file(filp); return ret; } /** * nilfs_ioctl_sync - make a checkpoint * @inode: inode object * @filp: file object * @cmd: ioctl's request code * @argp: pointer on argument from userspace * * Description: nilfs_ioctl_sync() function constructs a logical segment * for checkpointing. This function guarantees that all modified data * and metadata are written out to the device when it successfully * returned. * * Return Value: On success, 0 is retured. On errors, one of the following * negative error code is returned. * * %-EROFS - Read only filesystem. * * %-EIO - I/O error * * %-ENOSPC - No space left on device (only in a panic state). * * %-ERESTARTSYS - Interrupted. * * %-ENOMEM - Insufficient memory available. * * %-EFAULT - Failure during execution of requested operation. */ 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; nilfs = inode->i_sb->s_fs_info; ret = nilfs_flush_device(nilfs); if (ret < 0) return ret; if (argp != NULL) { 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; } /** * nilfs_ioctl_resize - resize NILFS2 volume * @inode: inode object * @filp: file object * @argp: pointer on argument from userspace * * Return Value: On success, 0 is returned or error code, otherwise. */ 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_file(filp); out: return ret; } /** * nilfs_ioctl_trim_fs() - trim ioctl handle function * @inode: inode object * @argp: pointer on argument from userspace * * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which * performs the actual trim operation. * * Return Value: On success, 0 is returned or negative error code, otherwise. */ static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp) { struct the_nilfs *nilfs = inode->i_sb->s_fs_info; struct request_queue *q = bdev_get_queue(nilfs->ns_bdev); struct fstrim_range range; int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!blk_queue_discard(q)) return -EOPNOTSUPP; if (copy_from_user(&range, argp, sizeof(range))) return -EFAULT; range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity); down_read(&nilfs->ns_segctor_sem); ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range); up_read(&nilfs->ns_segctor_sem); if (ret < 0) return ret; if (copy_to_user(argp, &range, sizeof(range))) return -EFAULT; return 0; } /** * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated * @inode: inode object * @argp: pointer on argument from userspace * * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit * of segments in bytes and upper limit of segments in bytes. * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility. * * Return Value: On success, 0 is returned or error code, otherwise. */ 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; } /** * nilfs_ioctl_get_info - wrapping function of get metadata info * @inode: inode object * @filp: file object * @cmd: ioctl's request code * @argp: pointer on argument from userspace * @membsz: size of an item in bytes * @dofunc: concrete function of getting metadata info * * Description: nilfs_ioctl_get_info() gets metadata info by means of * calling dofunc() function. * * Return Value: On success, 0 is returned and requested metadata info * is copied into userspace. On error, one of the following * negative error codes is returned. * * %-EINVAL - Invalid arguments from userspace. * * %-ENOMEM - Insufficient amount of memory available. * * %-EFAULT - Failure during execution of requested operation. */ 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; } /** * nilfs_ioctl_set_suinfo - set segment usage info * @inode: inode object * @filp: file object * @cmd: ioctl's request code * @argp: pointer on argument from userspace * * Description: Expects an array of nilfs_suinfo_update structures * encapsulated in nilfs_argv and updates the segment usage info * according to the flags in nilfs_suinfo_update. * * Return Value: On success, 0 is returned. On error, one of the * following negative error codes is returned. * * %-EPERM - Not enough permissions * * %-EFAULT - Error copying input data * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-EINVAL - Invalid values in input (segment number, flags or nblocks) */ static int nilfs_ioctl_set_suinfo(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_argv argv; size_t len; void __user *base; void *kbuf; 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(&argv, argp, sizeof(argv))) goto out; ret = -EINVAL; if (argv.v_size < sizeof(struct nilfs_suinfo_update)) goto out; if (argv.v_nmembs > nilfs->ns_nsegments) goto out; if (argv.v_nmembs >= UINT_MAX / argv.v_size) goto out; len = argv.v_size * argv.v_nmembs; if (!len) { ret = 0; goto out; } base = (void __user *)(unsigned long)argv.v_base; kbuf = vmalloc(len); if (!kbuf) { ret = -ENOMEM; goto out; } if (copy_from_user(kbuf, base, len)) { ret = -EFAULT; goto out_free; } nilfs_transaction_begin(inode->i_sb, &ti, 0); ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size, argv.v_nmembs); if (unlikely(ret < 0)) nilfs_transaction_abort(inode->i_sb); else nilfs_transaction_commit(inode->i_sb); /* never fails */ out_free: vfree(kbuf); out: mnt_drop_write_file(filp); return ret; } long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = file_inode(filp); 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_SET_SUINFO: return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp); 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); case FITRIM: return nilfs_ioctl_trim_fs(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_SET_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