2017-03-17 06:18:50 +00:00
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// SPDX-License-Identifier: GPL-2.0
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#ifndef NO_BCACHEFS_FS
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#include "bcachefs.h"
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#include "chardev.h"
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2018-12-17 11:11:14 +00:00
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#include "dirent.h"
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2017-03-17 06:18:50 +00:00
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#include "fs.h"
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2019-10-02 22:35:36 +00:00
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#include "fs-common.h"
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2017-03-17 06:18:50 +00:00
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#include "fs-ioctl.h"
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#include "quota.h"
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#include <linux/compat.h>
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2021-03-17 03:28:43 +00:00
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#include <linux/fsnotify.h>
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2017-03-17 06:18:50 +00:00
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#include <linux/mount.h>
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2021-03-17 03:28:43 +00:00
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#include <linux/namei.h>
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#include <linux/security.h>
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#include <linux/writeback.h>
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2017-03-17 06:18:50 +00:00
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#define FS_IOC_GOINGDOWN _IOR('X', 125, __u32)
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2021-05-23 01:13:17 +00:00
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#define FSOP_GOING_FLAGS_DEFAULT 0x0 /* going down */
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#define FSOP_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
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#define FSOP_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
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2017-03-17 06:18:50 +00:00
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struct flags_set {
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unsigned mask;
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unsigned flags;
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unsigned projid;
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2022-10-12 20:21:08 +00:00
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bool set_projinherit;
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bool projinherit;
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2017-03-17 06:18:50 +00:00
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};
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static int bch2_inode_flags_set(struct bch_inode_info *inode,
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struct bch_inode_unpacked *bi,
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void *p)
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{
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2018-07-17 18:12:42 +00:00
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struct bch_fs *c = inode->v.i_sb->s_fs_info;
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2017-03-17 06:18:50 +00:00
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/*
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* We're relying on btree locking here for exclusion with other ioctl
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* calls - use the flags in the btree (@bi), not inode->i_flags:
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*/
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struct flags_set *s = p;
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unsigned newflags = s->flags;
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unsigned oldflags = bi->bi_flags & s->mask;
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if (((newflags ^ oldflags) & (BCH_INODE_APPEND|BCH_INODE_IMMUTABLE)) &&
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!capable(CAP_LINUX_IMMUTABLE))
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return -EPERM;
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2018-07-17 18:12:42 +00:00
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if (!S_ISREG(bi->bi_mode) &&
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!S_ISDIR(bi->bi_mode) &&
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2017-03-17 06:18:50 +00:00
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(newflags & (BCH_INODE_NODUMP|BCH_INODE_NOATIME)) != newflags)
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return -EINVAL;
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2022-10-12 20:21:08 +00:00
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if (s->set_projinherit) {
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bi->bi_fields_set &= ~(1 << Inode_opt_project);
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bi->bi_fields_set |= ((int) s->projinherit << Inode_opt_project);
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}
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2017-03-17 06:18:50 +00:00
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bi->bi_flags &= ~s->mask;
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bi->bi_flags |= newflags;
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2018-07-17 18:12:42 +00:00
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bi->bi_ctime = timespec_to_bch2_time(c, current_time(&inode->v));
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2017-03-17 06:18:50 +00:00
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return 0;
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}
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static int bch2_ioc_getflags(struct bch_inode_info *inode, int __user *arg)
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{
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unsigned flags = map_flags(bch_flags_to_uflags, inode->ei_inode.bi_flags);
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return put_user(flags, arg);
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}
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static int bch2_ioc_setflags(struct bch_fs *c,
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struct file *file,
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struct bch_inode_info *inode,
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void __user *arg)
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{
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struct flags_set s = { .mask = map_defined(bch_flags_to_uflags) };
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unsigned uflags;
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int ret;
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if (get_user(uflags, (int __user *) arg))
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return -EFAULT;
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s.flags = map_flags_rev(bch_flags_to_uflags, uflags);
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if (uflags)
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return -EOPNOTSUPP;
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ret = mnt_want_write_file(file);
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if (ret)
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return ret;
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inode_lock(&inode->v);
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if (!inode_owner_or_capable(file_mnt_idmap(file), &inode->v)) {
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ret = -EACCES;
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goto setflags_out;
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}
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mutex_lock(&inode->ei_update_lock);
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2018-07-17 18:12:42 +00:00
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ret = bch2_write_inode(c, inode, bch2_inode_flags_set, &s,
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ATTR_CTIME);
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2017-03-17 06:18:50 +00:00
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mutex_unlock(&inode->ei_update_lock);
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setflags_out:
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inode_unlock(&inode->v);
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mnt_drop_write_file(file);
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return ret;
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}
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static int bch2_ioc_fsgetxattr(struct bch_inode_info *inode,
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struct fsxattr __user *arg)
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{
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struct fsxattr fa = { 0 };
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fa.fsx_xflags = map_flags(bch_flags_to_xflags, inode->ei_inode.bi_flags);
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2022-10-12 20:21:08 +00:00
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if (inode->ei_inode.bi_fields_set & (1 << Inode_opt_project))
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fa.fsx_xflags |= FS_XFLAG_PROJINHERIT;
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2017-03-17 06:18:50 +00:00
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fa.fsx_projid = inode->ei_qid.q[QTYP_PRJ];
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return copy_to_user(arg, &fa, sizeof(fa));
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}
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static int fssetxattr_inode_update_fn(struct bch_inode_info *inode,
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struct bch_inode_unpacked *bi,
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void *p)
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{
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struct flags_set *s = p;
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2018-12-13 13:32:11 +00:00
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if (s->projid != bi->bi_project) {
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2018-12-19 13:43:01 +00:00
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bi->bi_fields_set |= 1U << Inode_opt_project;
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2018-12-13 13:32:11 +00:00
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bi->bi_project = s->projid;
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}
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2017-03-17 06:18:50 +00:00
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return bch2_inode_flags_set(inode, bi, p);
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}
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static int bch2_ioc_fssetxattr(struct bch_fs *c,
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struct file *file,
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struct bch_inode_info *inode,
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struct fsxattr __user *arg)
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{
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struct flags_set s = { .mask = map_defined(bch_flags_to_xflags) };
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struct fsxattr fa;
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int ret;
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if (copy_from_user(&fa, arg, sizeof(fa)))
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return -EFAULT;
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2022-10-12 20:21:08 +00:00
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s.set_projinherit = true;
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s.projinherit = (fa.fsx_xflags & FS_XFLAG_PROJINHERIT) != 0;
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fa.fsx_xflags &= ~FS_XFLAG_PROJINHERIT;
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2017-03-17 06:18:50 +00:00
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s.flags = map_flags_rev(bch_flags_to_xflags, fa.fsx_xflags);
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if (fa.fsx_xflags)
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return -EOPNOTSUPP;
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2018-12-19 13:43:01 +00:00
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if (fa.fsx_projid >= U32_MAX)
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return -EINVAL;
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2020-08-24 18:57:48 +00:00
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/*
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* inode fields accessible via the xattr interface are stored with a +1
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* bias, so that 0 means unset:
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*/
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2018-12-19 13:43:01 +00:00
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s.projid = fa.fsx_projid + 1;
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2017-03-17 06:18:50 +00:00
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ret = mnt_want_write_file(file);
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if (ret)
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return ret;
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inode_lock(&inode->v);
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if (!inode_owner_or_capable(file_mnt_idmap(file), &inode->v)) {
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ret = -EACCES;
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goto err;
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}
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mutex_lock(&inode->ei_update_lock);
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2020-08-24 18:57:48 +00:00
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ret = bch2_set_projid(c, inode, fa.fsx_projid);
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2017-03-17 06:18:50 +00:00
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if (ret)
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goto err_unlock;
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2018-07-17 18:12:42 +00:00
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ret = bch2_write_inode(c, inode, fssetxattr_inode_update_fn, &s,
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ATTR_CTIME);
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2017-03-17 06:18:50 +00:00
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err_unlock:
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mutex_unlock(&inode->ei_update_lock);
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err:
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inode_unlock(&inode->v);
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mnt_drop_write_file(file);
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return ret;
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}
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2019-10-02 22:35:36 +00:00
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static int bch2_reinherit_attrs_fn(struct bch_inode_info *inode,
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struct bch_inode_unpacked *bi,
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void *p)
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{
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struct bch_inode_info *dir = p;
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return !bch2_reinherit_attrs(bi, &dir->ei_inode);
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}
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2018-12-17 11:11:14 +00:00
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static int bch2_ioc_reinherit_attrs(struct bch_fs *c,
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struct file *file,
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struct bch_inode_info *src,
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const char __user *name)
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{
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2021-03-02 23:35:30 +00:00
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struct bch_hash_info hash = bch2_hash_info_init(c, &src->ei_inode);
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2018-12-17 11:11:14 +00:00
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struct bch_inode_info *dst;
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struct inode *vinode = NULL;
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char *kname = NULL;
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struct qstr qstr;
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int ret = 0;
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2021-03-16 04:28:17 +00:00
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subvol_inum inum;
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2018-12-17 11:11:14 +00:00
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kname = kmalloc(BCH_NAME_MAX + 1, GFP_KERNEL);
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if (!kname)
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return -ENOMEM;
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ret = strncpy_from_user(kname, name, BCH_NAME_MAX);
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if (unlikely(ret < 0))
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goto err1;
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2018-12-19 21:01:38 +00:00
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qstr.len = ret;
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2018-12-17 11:11:14 +00:00
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qstr.name = kname;
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2021-03-16 04:28:17 +00:00
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ret = bch2_dirent_lookup(c, inode_inum(src), &hash, &qstr, &inum);
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if (ret)
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2018-12-17 11:11:14 +00:00
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goto err1;
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vinode = bch2_vfs_inode_get(c, inum);
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ret = PTR_ERR_OR_ZERO(vinode);
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if (ret)
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goto err1;
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dst = to_bch_ei(vinode);
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ret = mnt_want_write_file(file);
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if (ret)
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goto err2;
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2019-06-24 22:24:38 +00:00
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bch2_lock_inodes(INODE_UPDATE_LOCK, src, dst);
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2018-12-17 11:11:14 +00:00
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if (inode_attr_changing(src, dst, Inode_opt_project)) {
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ret = bch2_fs_quota_transfer(c, dst,
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src->ei_qid,
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1 << QTYP_PRJ,
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KEY_TYPE_QUOTA_PREALLOC);
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if (ret)
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goto err3;
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}
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ret = bch2_write_inode(c, dst, bch2_reinherit_attrs_fn, src, 0);
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err3:
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2019-06-24 22:24:38 +00:00
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bch2_unlock_inodes(INODE_UPDATE_LOCK, src, dst);
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2018-12-17 11:11:14 +00:00
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/* return true if we did work */
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if (ret >= 0)
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ret = !ret;
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mnt_drop_write_file(file);
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err2:
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iput(vinode);
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err1:
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kfree(kname);
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return ret;
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}
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2021-05-23 01:13:17 +00:00
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static int bch2_ioc_goingdown(struct bch_fs *c, u32 __user *arg)
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{
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u32 flags;
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int ret = 0;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (get_user(flags, arg))
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return -EFAULT;
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bch_notice(c, "shutdown by ioctl type %u", flags);
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down_write(&c->vfs_sb->s_umount);
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switch (flags) {
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case FSOP_GOING_FLAGS_DEFAULT:
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ret = freeze_bdev(c->vfs_sb->s_bdev);
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if (ret)
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goto err;
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bch2_journal_flush(&c->journal);
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c->vfs_sb->s_flags |= SB_RDONLY;
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bch2_fs_emergency_read_only(c);
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thaw_bdev(c->vfs_sb->s_bdev);
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break;
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case FSOP_GOING_FLAGS_LOGFLUSH:
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bch2_journal_flush(&c->journal);
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fallthrough;
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case FSOP_GOING_FLAGS_NOLOGFLUSH:
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c->vfs_sb->s_flags |= SB_RDONLY;
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bch2_fs_emergency_read_only(c);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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err:
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up_write(&c->vfs_sb->s_umount);
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return ret;
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}
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|
2021-03-17 03:28:43 +00:00
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static long bch2_ioctl_subvolume_create(struct bch_fs *c, struct file *filp,
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struct bch_ioctl_subvolume arg)
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{
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struct inode *dir;
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struct bch_inode_info *inode;
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struct user_namespace *s_user_ns;
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struct dentry *dst_dentry;
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struct path src_path, dst_path;
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int how = LOOKUP_FOLLOW;
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int error;
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subvol_inum snapshot_src = { 0 };
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unsigned lookup_flags = 0;
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unsigned create_flags = BCH_CREATE_SUBVOL;
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if (arg.flags & ~(BCH_SUBVOL_SNAPSHOT_CREATE|
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BCH_SUBVOL_SNAPSHOT_RO))
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return -EINVAL;
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if (!(arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) &&
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|
|
|
(arg.src_ptr ||
|
|
|
|
(arg.flags & BCH_SUBVOL_SNAPSHOT_RO)))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE)
|
|
|
|
create_flags |= BCH_CREATE_SNAPSHOT;
|
|
|
|
|
|
|
|
if (arg.flags & BCH_SUBVOL_SNAPSHOT_RO)
|
|
|
|
create_flags |= BCH_CREATE_SNAPSHOT_RO;
|
|
|
|
|
|
|
|
/* why do we need this lock? */
|
|
|
|
down_read(&c->vfs_sb->s_umount);
|
|
|
|
|
|
|
|
if (arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE)
|
|
|
|
sync_inodes_sb(c->vfs_sb);
|
|
|
|
retry:
|
|
|
|
if (arg.src_ptr) {
|
|
|
|
error = user_path_at(arg.dirfd,
|
|
|
|
(const char __user *)(unsigned long)arg.src_ptr,
|
|
|
|
how, &src_path);
|
|
|
|
if (error)
|
|
|
|
goto err1;
|
|
|
|
|
|
|
|
if (src_path.dentry->d_sb->s_fs_info != c) {
|
|
|
|
path_put(&src_path);
|
|
|
|
error = -EXDEV;
|
|
|
|
goto err1;
|
|
|
|
}
|
|
|
|
|
|
|
|
snapshot_src = inode_inum(to_bch_ei(src_path.dentry->d_inode));
|
|
|
|
}
|
|
|
|
|
|
|
|
dst_dentry = user_path_create(arg.dirfd,
|
|
|
|
(const char __user *)(unsigned long)arg.dst_ptr,
|
|
|
|
&dst_path, lookup_flags);
|
|
|
|
error = PTR_ERR_OR_ZERO(dst_dentry);
|
|
|
|
if (error)
|
|
|
|
goto err2;
|
|
|
|
|
|
|
|
if (dst_dentry->d_sb->s_fs_info != c) {
|
|
|
|
error = -EXDEV;
|
|
|
|
goto err3;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (dst_dentry->d_inode) {
|
|
|
|
error = -EEXIST;
|
|
|
|
goto err3;
|
|
|
|
}
|
|
|
|
|
|
|
|
dir = dst_path.dentry->d_inode;
|
|
|
|
if (IS_DEADDIR(dir)) {
|
|
|
|
error = -ENOENT;
|
|
|
|
goto err3;
|
|
|
|
}
|
|
|
|
|
|
|
|
s_user_ns = dir->i_sb->s_user_ns;
|
|
|
|
if (!kuid_has_mapping(s_user_ns, current_fsuid()) ||
|
|
|
|
!kgid_has_mapping(s_user_ns, current_fsgid())) {
|
|
|
|
error = -EOVERFLOW;
|
|
|
|
goto err3;
|
|
|
|
}
|
|
|
|
|
|
|
|
error = inode_permission(file_mnt_idmap(filp),
|
|
|
|
dir, MAY_WRITE | MAY_EXEC);
|
|
|
|
if (error)
|
|
|
|
goto err3;
|
|
|
|
|
|
|
|
if (!IS_POSIXACL(dir))
|
|
|
|
arg.mode &= ~current_umask();
|
|
|
|
|
|
|
|
error = security_path_mkdir(&dst_path, dst_dentry, arg.mode);
|
|
|
|
if (error)
|
|
|
|
goto err3;
|
|
|
|
|
|
|
|
if ((arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) &&
|
|
|
|
!arg.src_ptr)
|
|
|
|
snapshot_src.subvol = to_bch_ei(dir)->ei_inode.bi_subvol;
|
|
|
|
|
|
|
|
inode = __bch2_create(file_mnt_idmap(filp), to_bch_ei(dir),
|
|
|
|
dst_dentry, arg.mode|S_IFDIR,
|
|
|
|
0, snapshot_src, create_flags);
|
|
|
|
error = PTR_ERR_OR_ZERO(inode);
|
|
|
|
if (error)
|
|
|
|
goto err3;
|
|
|
|
|
|
|
|
d_instantiate(dst_dentry, &inode->v);
|
|
|
|
fsnotify_mkdir(dir, dst_dentry);
|
|
|
|
err3:
|
|
|
|
done_path_create(&dst_path, dst_dentry);
|
|
|
|
err2:
|
|
|
|
if (arg.src_ptr)
|
|
|
|
path_put(&src_path);
|
|
|
|
|
|
|
|
if (retry_estale(error, lookup_flags)) {
|
|
|
|
lookup_flags |= LOOKUP_REVAL;
|
|
|
|
goto retry;
|
|
|
|
}
|
|
|
|
err1:
|
|
|
|
up_read(&c->vfs_sb->s_umount);
|
|
|
|
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
static long bch2_ioctl_subvolume_destroy(struct bch_fs *c, struct file *filp,
|
|
|
|
struct bch_ioctl_subvolume arg)
|
|
|
|
{
|
|
|
|
struct path path;
|
2021-10-21 00:50:07 +00:00
|
|
|
struct inode *dir;
|
2021-03-17 03:28:43 +00:00
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (arg.flags)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
ret = user_path_at(arg.dirfd,
|
|
|
|
(const char __user *)(unsigned long)arg.dst_ptr,
|
|
|
|
LOOKUP_FOLLOW, &path);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
if (path.dentry->d_sb->s_fs_info != c) {
|
|
|
|
path_put(&path);
|
|
|
|
return -EXDEV;
|
|
|
|
}
|
|
|
|
|
2021-10-21 00:50:07 +00:00
|
|
|
dir = path.dentry->d_parent->d_inode;
|
|
|
|
|
2021-10-11 16:03:19 +00:00
|
|
|
ret = __bch2_unlink(dir, path.dentry, true);
|
2021-10-21 00:50:07 +00:00
|
|
|
if (!ret) {
|
|
|
|
fsnotify_rmdir(dir, path.dentry);
|
|
|
|
d_delete(path.dentry);
|
|
|
|
}
|
2021-03-17 03:28:43 +00:00
|
|
|
path_put(&path);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2017-03-17 06:18:50 +00:00
|
|
|
long bch2_fs_file_ioctl(struct file *file, unsigned cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
struct bch_inode_info *inode = file_bch_inode(file);
|
2021-05-23 01:13:17 +00:00
|
|
|
struct bch_fs *c = inode->v.i_sb->s_fs_info;
|
2022-09-18 19:43:50 +00:00
|
|
|
long ret;
|
2017-03-17 06:18:50 +00:00
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case FS_IOC_GETFLAGS:
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = bch2_ioc_getflags(inode, (int __user *) arg);
|
|
|
|
break;
|
2017-03-17 06:18:50 +00:00
|
|
|
|
|
|
|
case FS_IOC_SETFLAGS:
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = bch2_ioc_setflags(c, file, inode, (int __user *) arg);
|
|
|
|
break;
|
2017-03-17 06:18:50 +00:00
|
|
|
|
|
|
|
case FS_IOC_FSGETXATTR:
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = bch2_ioc_fsgetxattr(inode, (void __user *) arg);
|
|
|
|
break;
|
|
|
|
|
2017-03-17 06:18:50 +00:00
|
|
|
case FS_IOC_FSSETXATTR:
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = bch2_ioc_fssetxattr(c, file, inode,
|
|
|
|
(void __user *) arg);
|
|
|
|
break;
|
2018-12-17 11:11:14 +00:00
|
|
|
|
|
|
|
case BCHFS_IOC_REINHERIT_ATTRS:
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = bch2_ioc_reinherit_attrs(c, file, inode,
|
|
|
|
(void __user *) arg);
|
|
|
|
break;
|
2017-03-17 06:18:50 +00:00
|
|
|
|
|
|
|
case FS_IOC_GETVERSION:
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = -ENOTTY;
|
|
|
|
break;
|
|
|
|
|
2017-03-17 06:18:50 +00:00
|
|
|
case FS_IOC_SETVERSION:
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = -ENOTTY;
|
|
|
|
break;
|
2017-03-17 06:18:50 +00:00
|
|
|
|
|
|
|
case FS_IOC_GOINGDOWN:
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = bch2_ioc_goingdown(c, (u32 __user *) arg);
|
|
|
|
break;
|
2017-03-17 06:18:50 +00:00
|
|
|
|
2021-03-17 03:28:43 +00:00
|
|
|
case BCH_IOCTL_SUBVOLUME_CREATE: {
|
|
|
|
struct bch_ioctl_subvolume i;
|
|
|
|
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = copy_from_user(&i, (void __user *) arg, sizeof(i))
|
|
|
|
? -EFAULT
|
|
|
|
: bch2_ioctl_subvolume_create(c, file, i);
|
|
|
|
break;
|
2021-03-17 03:28:43 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
case BCH_IOCTL_SUBVOLUME_DESTROY: {
|
|
|
|
struct bch_ioctl_subvolume i;
|
|
|
|
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = copy_from_user(&i, (void __user *) arg, sizeof(i))
|
|
|
|
? -EFAULT
|
|
|
|
: bch2_ioctl_subvolume_destroy(c, file, i);
|
|
|
|
break;
|
2021-03-17 03:28:43 +00:00
|
|
|
}
|
|
|
|
|
2017-03-17 06:18:50 +00:00
|
|
|
default:
|
2022-09-18 19:43:50 +00:00
|
|
|
ret = bch2_fs_ioctl(c, cmd, (void __user *) arg);
|
|
|
|
break;
|
2017-03-17 06:18:50 +00:00
|
|
|
}
|
2022-09-18 19:43:50 +00:00
|
|
|
|
|
|
|
return bch2_err_class(ret);
|
2017-03-17 06:18:50 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
long bch2_compat_fs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
/* These are just misnamed, they actually get/put from/to user an int */
|
|
|
|
switch (cmd) {
|
|
|
|
case FS_IOC_GETFLAGS:
|
|
|
|
cmd = FS_IOC_GETFLAGS;
|
|
|
|
break;
|
|
|
|
case FS_IOC32_SETFLAGS:
|
|
|
|
cmd = FS_IOC_SETFLAGS;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return -ENOIOCTLCMD;
|
|
|
|
}
|
|
|
|
return bch2_fs_file_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#endif /* NO_BCACHEFS_FS */
|