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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * ioctl.c - NILFS ioctl operations.
- *
- * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
- *
- * 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;
- ret = vfs_ioc_setflags_prepare(inode, oldflags, flags);
- if (ret)
- 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_crit(inode->i_sb,
- "%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_crit(inode->i_sb,
- "%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_err(nilfs->ns_sb, "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_err(inode->i_sb,
- "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:
- case FITRIM:
- break;
- default:
- return -ENOIOCTLCMD;
- }
- return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
- }
- #endif
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