565 lines
13 KiB
C
565 lines
13 KiB
C
// 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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#include "dirent.h"
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#include "fs.h"
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#include "fs-common.h"
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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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#include <linux/fsnotify.h>
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#include <linux/mount.h>
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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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#define FS_IOC_GOINGDOWN _IOR('X', 125, __u32)
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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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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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bool set_projinherit;
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bool projinherit;
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};
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static int bch2_inode_flags_set(struct btree_trans *trans,
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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_fs *c = inode->v.i_sb->s_fs_info;
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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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if (!S_ISREG(bi->bi_mode) &&
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!S_ISDIR(bi->bi_mode) &&
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(newflags & (BCH_INODE_nodump|BCH_INODE_noatime)) != newflags)
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return -EINVAL;
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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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bi->bi_flags &= ~s->mask;
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bi->bi_flags |= newflags;
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bi->bi_ctime = timespec_to_bch2_time(c, current_time(&inode->v));
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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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ret = bch2_subvol_is_ro(c, inode->ei_subvol) ?:
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bch2_write_inode(c, inode, bch2_inode_flags_set, &s,
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ATTR_CTIME);
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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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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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fa.fsx_projid = inode->ei_qid.q[QTYP_PRJ];
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if (copy_to_user(arg, &fa, sizeof(fa)))
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return -EFAULT;
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return 0;
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}
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static int fssetxattr_inode_update_fn(struct btree_trans *trans,
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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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if (s->projid != bi->bi_project) {
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bi->bi_fields_set |= 1U << Inode_opt_project;
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bi->bi_project = s->projid;
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}
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return bch2_inode_flags_set(trans, 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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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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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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if (fa.fsx_projid >= U32_MAX)
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return -EINVAL;
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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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s.projid = fa.fsx_projid + 1;
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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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ret = bch2_subvol_is_ro(c, inode->ei_subvol) ?:
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bch2_set_projid(c, inode, fa.fsx_projid) ?:
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bch2_write_inode(c, inode, fssetxattr_inode_update_fn, &s,
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ATTR_CTIME);
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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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static int bch2_reinherit_attrs_fn(struct btree_trans *trans,
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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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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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struct bch_hash_info hash = bch2_hash_info_init(c, &src->ei_inode);
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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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subvol_inum inum;
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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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qstr.len = ret;
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qstr.name = kname;
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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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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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bch2_lock_inodes(INODE_UPDATE_LOCK, src, dst);
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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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bch2_unlock_inodes(INODE_UPDATE_LOCK, src, dst);
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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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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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switch (flags) {
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case FSOP_GOING_FLAGS_DEFAULT:
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ret = bdev_freeze(c->vfs_sb->s_bdev);
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if (ret)
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break;
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bch2_journal_flush(&c->journal);
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bch2_fs_emergency_read_only(c);
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bdev_thaw(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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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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return ret;
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}
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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 ||
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(arg.flags & 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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create_flags |= BCH_CREATE_SNAPSHOT;
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if (arg.flags & BCH_SUBVOL_SNAPSHOT_RO)
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create_flags |= BCH_CREATE_SNAPSHOT_RO;
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if (arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) {
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/* sync_inodes_sb enforce s_umount is locked */
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down_read(&c->vfs_sb->s_umount);
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sync_inodes_sb(c->vfs_sb);
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up_read(&c->vfs_sb->s_umount);
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}
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retry:
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if (arg.src_ptr) {
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error = user_path_at(arg.dirfd,
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(const char __user *)(unsigned long)arg.src_ptr,
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how, &src_path);
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if (error)
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goto err1;
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if (src_path.dentry->d_sb->s_fs_info != c) {
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path_put(&src_path);
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error = -EXDEV;
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goto err1;
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}
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snapshot_src = inode_inum(to_bch_ei(src_path.dentry->d_inode));
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}
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dst_dentry = user_path_create(arg.dirfd,
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(const char __user *)(unsigned long)arg.dst_ptr,
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&dst_path, lookup_flags);
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error = PTR_ERR_OR_ZERO(dst_dentry);
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if (error)
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goto err2;
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if (dst_dentry->d_sb->s_fs_info != c) {
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error = -EXDEV;
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goto err3;
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}
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if (dst_dentry->d_inode) {
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error = -EEXIST;
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goto err3;
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}
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dir = dst_path.dentry->d_inode;
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if (IS_DEADDIR(dir)) {
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error = -BCH_ERR_ENOENT_directory_dead;
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goto err3;
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}
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s_user_ns = dir->i_sb->s_user_ns;
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if (!kuid_has_mapping(s_user_ns, current_fsuid()) ||
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!kgid_has_mapping(s_user_ns, current_fsgid())) {
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error = -EOVERFLOW;
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goto err3;
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}
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error = inode_permission(file_mnt_idmap(filp),
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dir, MAY_WRITE | MAY_EXEC);
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if (error)
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goto err3;
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if (!IS_POSIXACL(dir))
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arg.mode &= ~current_umask();
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error = security_path_mkdir(&dst_path, dst_dentry, arg.mode);
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if (error)
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goto err3;
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if ((arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) &&
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!arg.src_ptr)
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snapshot_src.subvol = inode_inum(to_bch_ei(dir)).subvol;
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inode = __bch2_create(file_mnt_idmap(filp), to_bch_ei(dir),
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dst_dentry, arg.mode|S_IFDIR,
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0, snapshot_src, create_flags);
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error = PTR_ERR_OR_ZERO(inode);
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if (error)
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goto err3;
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d_instantiate(dst_dentry, &inode->v);
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fsnotify_mkdir(dir, dst_dentry);
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err3:
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done_path_create(&dst_path, dst_dentry);
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err2:
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if (arg.src_ptr)
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path_put(&src_path);
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if (retry_estale(error, lookup_flags)) {
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lookup_flags |= LOOKUP_REVAL;
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goto retry;
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}
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err1:
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return error;
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}
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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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down_write(&c->snapshot_create_lock);
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long ret = __bch2_ioctl_subvolume_create(c, filp, arg);
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up_write(&c->snapshot_create_lock);
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return ret;
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}
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static long bch2_ioctl_subvolume_destroy(struct bch_fs *c, struct file *filp,
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struct bch_ioctl_subvolume arg)
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{
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const char __user *name = (void __user *)(unsigned long)arg.dst_ptr;
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struct path path;
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struct inode *dir;
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struct dentry *victim;
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int ret = 0;
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if (arg.flags)
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return -EINVAL;
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victim = user_path_locked_at(arg.dirfd, name, &path);
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if (IS_ERR(victim))
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return PTR_ERR(victim);
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if (victim->d_sb->s_fs_info != c) {
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ret = -EXDEV;
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goto err;
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}
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if (!d_is_positive(victim)) {
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ret = -ENOENT;
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goto err;
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}
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dir = d_inode(path.dentry);
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ret = __bch2_unlink(dir, victim, true);
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if (!ret) {
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fsnotify_rmdir(dir, victim);
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d_delete(victim);
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}
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inode_unlock(dir);
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err:
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dput(victim);
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path_put(&path);
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return ret;
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}
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long bch2_fs_file_ioctl(struct file *file, unsigned cmd, unsigned long arg)
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{
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struct bch_inode_info *inode = file_bch_inode(file);
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struct bch_fs *c = inode->v.i_sb->s_fs_info;
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long ret;
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switch (cmd) {
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case FS_IOC_GETFLAGS:
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ret = bch2_ioc_getflags(inode, (int __user *) arg);
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break;
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case FS_IOC_SETFLAGS:
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ret = bch2_ioc_setflags(c, file, inode, (int __user *) arg);
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break;
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case FS_IOC_FSGETXATTR:
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ret = bch2_ioc_fsgetxattr(inode, (void __user *) arg);
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break;
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case FS_IOC_FSSETXATTR:
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ret = bch2_ioc_fssetxattr(c, file, inode,
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(void __user *) arg);
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break;
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case BCHFS_IOC_REINHERIT_ATTRS:
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ret = bch2_ioc_reinherit_attrs(c, file, inode,
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(void __user *) arg);
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break;
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case FS_IOC_GETVERSION:
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ret = -ENOTTY;
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break;
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case FS_IOC_SETVERSION:
|
|
ret = -ENOTTY;
|
|
break;
|
|
|
|
case FS_IOC_GOINGDOWN:
|
|
ret = bch2_ioc_goingdown(c, (u32 __user *) arg);
|
|
break;
|
|
|
|
case BCH_IOCTL_SUBVOLUME_CREATE: {
|
|
struct bch_ioctl_subvolume i;
|
|
|
|
ret = copy_from_user(&i, (void __user *) arg, sizeof(i))
|
|
? -EFAULT
|
|
: bch2_ioctl_subvolume_create(c, file, i);
|
|
break;
|
|
}
|
|
|
|
case BCH_IOCTL_SUBVOLUME_DESTROY: {
|
|
struct bch_ioctl_subvolume i;
|
|
|
|
ret = copy_from_user(&i, (void __user *) arg, sizeof(i))
|
|
? -EFAULT
|
|
: bch2_ioctl_subvolume_destroy(c, file, i);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
ret = bch2_fs_ioctl(c, cmd, (void __user *) arg);
|
|
break;
|
|
}
|
|
|
|
return bch2_err_class(ret);
|
|
}
|
|
|
|
#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 */
|