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715 lines
16 KiB
715 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2017 Red Hat, Inc. |
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*/ |
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|
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#include <linux/cred.h> |
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#include <linux/file.h> |
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#include <linux/mount.h> |
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#include <linux/xattr.h> |
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#include <linux/uio.h> |
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#include <linux/uaccess.h> |
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#include <linux/splice.h> |
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#include <linux/security.h> |
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#include <linux/mm.h> |
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#include <linux/fs.h> |
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#include "overlayfs.h" |
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struct ovl_aio_req { |
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struct kiocb iocb; |
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struct kiocb *orig_iocb; |
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struct fd fd; |
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}; |
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static struct kmem_cache *ovl_aio_request_cachep; |
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static char ovl_whatisit(struct inode *inode, struct inode *realinode) |
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{ |
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if (realinode != ovl_inode_upper(inode)) |
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return 'l'; |
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if (ovl_has_upperdata(inode)) |
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return 'u'; |
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else |
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return 'm'; |
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} |
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/* No atime modificaton nor notify on underlying */ |
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#define OVL_OPEN_FLAGS (O_NOATIME | FMODE_NONOTIFY) |
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static struct file *ovl_open_realfile(const struct file *file, |
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struct inode *realinode) |
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{ |
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struct inode *inode = file_inode(file); |
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struct file *realfile; |
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const struct cred *old_cred; |
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int flags = file->f_flags | OVL_OPEN_FLAGS; |
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int acc_mode = ACC_MODE(flags); |
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int err; |
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if (flags & O_APPEND) |
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acc_mode |= MAY_APPEND; |
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old_cred = ovl_override_creds(inode->i_sb); |
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err = inode_permission(&init_user_ns, realinode, MAY_OPEN | acc_mode); |
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if (err) { |
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realfile = ERR_PTR(err); |
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} else { |
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if (!inode_owner_or_capable(&init_user_ns, realinode)) |
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flags &= ~O_NOATIME; |
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realfile = open_with_fake_path(&file->f_path, flags, realinode, |
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current_cred()); |
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} |
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revert_creds(old_cred); |
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pr_debug("open(%p[%pD2/%c], 0%o) -> (%p, 0%o)\n", |
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file, file, ovl_whatisit(inode, realinode), file->f_flags, |
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realfile, IS_ERR(realfile) ? 0 : realfile->f_flags); |
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return realfile; |
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} |
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#define OVL_SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT) |
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static int ovl_change_flags(struct file *file, unsigned int flags) |
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{ |
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struct inode *inode = file_inode(file); |
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int err; |
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flags &= OVL_SETFL_MASK; |
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if (((flags ^ file->f_flags) & O_APPEND) && IS_APPEND(inode)) |
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return -EPERM; |
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if (flags & O_DIRECT) { |
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if (!file->f_mapping->a_ops || |
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!file->f_mapping->a_ops->direct_IO) |
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return -EINVAL; |
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} |
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if (file->f_op->check_flags) { |
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err = file->f_op->check_flags(flags); |
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if (err) |
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return err; |
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} |
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spin_lock(&file->f_lock); |
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file->f_flags = (file->f_flags & ~OVL_SETFL_MASK) | flags; |
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spin_unlock(&file->f_lock); |
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return 0; |
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} |
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static int ovl_real_fdget_meta(const struct file *file, struct fd *real, |
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bool allow_meta) |
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{ |
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struct inode *inode = file_inode(file); |
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struct inode *realinode; |
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real->flags = 0; |
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real->file = file->private_data; |
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if (allow_meta) |
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realinode = ovl_inode_real(inode); |
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else |
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realinode = ovl_inode_realdata(inode); |
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/* Has it been copied up since we'd opened it? */ |
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if (unlikely(file_inode(real->file) != realinode)) { |
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real->flags = FDPUT_FPUT; |
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real->file = ovl_open_realfile(file, realinode); |
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return PTR_ERR_OR_ZERO(real->file); |
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} |
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/* Did the flags change since open? */ |
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if (unlikely((file->f_flags ^ real->file->f_flags) & ~OVL_OPEN_FLAGS)) |
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return ovl_change_flags(real->file, file->f_flags); |
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return 0; |
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} |
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static int ovl_real_fdget(const struct file *file, struct fd *real) |
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{ |
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if (d_is_dir(file_dentry(file))) { |
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real->flags = 0; |
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real->file = ovl_dir_real_file(file, false); |
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return PTR_ERR_OR_ZERO(real->file); |
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} |
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return ovl_real_fdget_meta(file, real, false); |
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} |
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static int ovl_open(struct inode *inode, struct file *file) |
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{ |
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struct file *realfile; |
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int err; |
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err = ovl_maybe_copy_up(file_dentry(file), file->f_flags); |
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if (err) |
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return err; |
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/* No longer need these flags, so don't pass them on to underlying fs */ |
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file->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); |
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realfile = ovl_open_realfile(file, ovl_inode_realdata(inode)); |
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if (IS_ERR(realfile)) |
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return PTR_ERR(realfile); |
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file->private_data = realfile; |
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return 0; |
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} |
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static int ovl_release(struct inode *inode, struct file *file) |
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{ |
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fput(file->private_data); |
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return 0; |
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} |
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static loff_t ovl_llseek(struct file *file, loff_t offset, int whence) |
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{ |
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struct inode *inode = file_inode(file); |
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struct fd real; |
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const struct cred *old_cred; |
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loff_t ret; |
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/* |
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* The two special cases below do not need to involve real fs, |
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* so we can optimizing concurrent callers. |
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*/ |
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if (offset == 0) { |
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if (whence == SEEK_CUR) |
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return file->f_pos; |
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if (whence == SEEK_SET) |
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return vfs_setpos(file, 0, 0); |
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} |
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ret = ovl_real_fdget(file, &real); |
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if (ret) |
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return ret; |
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/* |
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* Overlay file f_pos is the master copy that is preserved |
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* through copy up and modified on read/write, but only real |
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* fs knows how to SEEK_HOLE/SEEK_DATA and real fs may impose |
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* limitations that are more strict than ->s_maxbytes for specific |
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* files, so we use the real file to perform seeks. |
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*/ |
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ovl_inode_lock(inode); |
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real.file->f_pos = file->f_pos; |
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old_cred = ovl_override_creds(inode->i_sb); |
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ret = vfs_llseek(real.file, offset, whence); |
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revert_creds(old_cred); |
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file->f_pos = real.file->f_pos; |
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ovl_inode_unlock(inode); |
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fdput(real); |
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return ret; |
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} |
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static void ovl_file_accessed(struct file *file) |
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{ |
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struct inode *inode, *upperinode; |
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if (file->f_flags & O_NOATIME) |
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return; |
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inode = file_inode(file); |
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upperinode = ovl_inode_upper(inode); |
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if (!upperinode) |
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return; |
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if ((!timespec64_equal(&inode->i_mtime, &upperinode->i_mtime) || |
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!timespec64_equal(&inode->i_ctime, &upperinode->i_ctime))) { |
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inode->i_mtime = upperinode->i_mtime; |
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inode->i_ctime = upperinode->i_ctime; |
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} |
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touch_atime(&file->f_path); |
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} |
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static rwf_t ovl_iocb_to_rwf(int ifl) |
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{ |
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rwf_t flags = 0; |
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if (ifl & IOCB_NOWAIT) |
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flags |= RWF_NOWAIT; |
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if (ifl & IOCB_HIPRI) |
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flags |= RWF_HIPRI; |
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if (ifl & IOCB_DSYNC) |
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flags |= RWF_DSYNC; |
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if (ifl & IOCB_SYNC) |
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flags |= RWF_SYNC; |
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return flags; |
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} |
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static void ovl_aio_cleanup_handler(struct ovl_aio_req *aio_req) |
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{ |
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struct kiocb *iocb = &aio_req->iocb; |
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struct kiocb *orig_iocb = aio_req->orig_iocb; |
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if (iocb->ki_flags & IOCB_WRITE) { |
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struct inode *inode = file_inode(orig_iocb->ki_filp); |
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/* Actually acquired in ovl_write_iter() */ |
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__sb_writers_acquired(file_inode(iocb->ki_filp)->i_sb, |
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SB_FREEZE_WRITE); |
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file_end_write(iocb->ki_filp); |
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ovl_copyattr(ovl_inode_real(inode), inode); |
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} |
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orig_iocb->ki_pos = iocb->ki_pos; |
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fdput(aio_req->fd); |
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kmem_cache_free(ovl_aio_request_cachep, aio_req); |
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} |
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static void ovl_aio_rw_complete(struct kiocb *iocb, long res, long res2) |
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{ |
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struct ovl_aio_req *aio_req = container_of(iocb, |
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struct ovl_aio_req, iocb); |
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struct kiocb *orig_iocb = aio_req->orig_iocb; |
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ovl_aio_cleanup_handler(aio_req); |
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orig_iocb->ki_complete(orig_iocb, res, res2); |
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} |
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static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter) |
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{ |
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struct file *file = iocb->ki_filp; |
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struct fd real; |
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const struct cred *old_cred; |
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ssize_t ret; |
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if (!iov_iter_count(iter)) |
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return 0; |
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ret = ovl_real_fdget(file, &real); |
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if (ret) |
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return ret; |
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old_cred = ovl_override_creds(file_inode(file)->i_sb); |
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if (is_sync_kiocb(iocb)) { |
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ret = vfs_iter_read(real.file, iter, &iocb->ki_pos, |
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ovl_iocb_to_rwf(iocb->ki_flags)); |
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} else { |
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struct ovl_aio_req *aio_req; |
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ret = -ENOMEM; |
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aio_req = kmem_cache_zalloc(ovl_aio_request_cachep, GFP_KERNEL); |
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if (!aio_req) |
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goto out; |
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aio_req->fd = real; |
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real.flags = 0; |
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aio_req->orig_iocb = iocb; |
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kiocb_clone(&aio_req->iocb, iocb, real.file); |
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aio_req->iocb.ki_complete = ovl_aio_rw_complete; |
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ret = vfs_iocb_iter_read(real.file, &aio_req->iocb, iter); |
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if (ret != -EIOCBQUEUED) |
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ovl_aio_cleanup_handler(aio_req); |
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} |
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out: |
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revert_creds(old_cred); |
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ovl_file_accessed(file); |
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fdput(real); |
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return ret; |
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} |
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static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter) |
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{ |
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struct file *file = iocb->ki_filp; |
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struct inode *inode = file_inode(file); |
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struct fd real; |
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const struct cred *old_cred; |
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ssize_t ret; |
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int ifl = iocb->ki_flags; |
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if (!iov_iter_count(iter)) |
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return 0; |
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inode_lock(inode); |
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/* Update mode */ |
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ovl_copyattr(ovl_inode_real(inode), inode); |
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ret = file_remove_privs(file); |
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if (ret) |
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goto out_unlock; |
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ret = ovl_real_fdget(file, &real); |
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if (ret) |
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goto out_unlock; |
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if (!ovl_should_sync(OVL_FS(inode->i_sb))) |
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ifl &= ~(IOCB_DSYNC | IOCB_SYNC); |
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old_cred = ovl_override_creds(file_inode(file)->i_sb); |
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if (is_sync_kiocb(iocb)) { |
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file_start_write(real.file); |
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ret = vfs_iter_write(real.file, iter, &iocb->ki_pos, |
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ovl_iocb_to_rwf(ifl)); |
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file_end_write(real.file); |
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/* Update size */ |
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ovl_copyattr(ovl_inode_real(inode), inode); |
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} else { |
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struct ovl_aio_req *aio_req; |
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ret = -ENOMEM; |
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aio_req = kmem_cache_zalloc(ovl_aio_request_cachep, GFP_KERNEL); |
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if (!aio_req) |
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goto out; |
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file_start_write(real.file); |
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/* Pacify lockdep, same trick as done in aio_write() */ |
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__sb_writers_release(file_inode(real.file)->i_sb, |
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SB_FREEZE_WRITE); |
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aio_req->fd = real; |
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real.flags = 0; |
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aio_req->orig_iocb = iocb; |
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kiocb_clone(&aio_req->iocb, iocb, real.file); |
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aio_req->iocb.ki_flags = ifl; |
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aio_req->iocb.ki_complete = ovl_aio_rw_complete; |
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ret = vfs_iocb_iter_write(real.file, &aio_req->iocb, iter); |
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if (ret != -EIOCBQUEUED) |
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ovl_aio_cleanup_handler(aio_req); |
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} |
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out: |
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revert_creds(old_cred); |
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fdput(real); |
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out_unlock: |
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inode_unlock(inode); |
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return ret; |
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} |
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static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
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{ |
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struct fd real; |
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const struct cred *old_cred; |
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int ret; |
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ret = ovl_sync_status(OVL_FS(file_inode(file)->i_sb)); |
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if (ret <= 0) |
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return ret; |
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ret = ovl_real_fdget_meta(file, &real, !datasync); |
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if (ret) |
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return ret; |
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/* Don't sync lower file for fear of receiving EROFS error */ |
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if (file_inode(real.file) == ovl_inode_upper(file_inode(file))) { |
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old_cred = ovl_override_creds(file_inode(file)->i_sb); |
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ret = vfs_fsync_range(real.file, start, end, datasync); |
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revert_creds(old_cred); |
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} |
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fdput(real); |
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return ret; |
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} |
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static int ovl_mmap(struct file *file, struct vm_area_struct *vma) |
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{ |
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struct file *realfile = file->private_data; |
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const struct cred *old_cred; |
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int ret; |
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if (!realfile->f_op->mmap) |
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return -ENODEV; |
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if (WARN_ON(file != vma->vm_file)) |
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return -EIO; |
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vma_set_file(vma, realfile); |
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old_cred = ovl_override_creds(file_inode(file)->i_sb); |
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ret = call_mmap(vma->vm_file, vma); |
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revert_creds(old_cred); |
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ovl_file_accessed(file); |
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return ret; |
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} |
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static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
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{ |
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struct inode *inode = file_inode(file); |
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struct fd real; |
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const struct cred *old_cred; |
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int ret; |
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ret = ovl_real_fdget(file, &real); |
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if (ret) |
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return ret; |
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old_cred = ovl_override_creds(file_inode(file)->i_sb); |
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ret = vfs_fallocate(real.file, mode, offset, len); |
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revert_creds(old_cred); |
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/* Update size */ |
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ovl_copyattr(ovl_inode_real(inode), inode); |
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fdput(real); |
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return ret; |
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} |
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static int ovl_fadvise(struct file *file, loff_t offset, loff_t len, int advice) |
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{ |
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struct fd real; |
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const struct cred *old_cred; |
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int ret; |
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ret = ovl_real_fdget(file, &real); |
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if (ret) |
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return ret; |
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old_cred = ovl_override_creds(file_inode(file)->i_sb); |
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ret = vfs_fadvise(real.file, offset, len, advice); |
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revert_creds(old_cred); |
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fdput(real); |
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return ret; |
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} |
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static long ovl_real_ioctl(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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struct fd real; |
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long ret; |
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ret = ovl_real_fdget(file, &real); |
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if (ret) |
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return ret; |
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ret = security_file_ioctl(real.file, cmd, arg); |
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if (!ret) { |
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/* |
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* Don't override creds, since we currently can't safely check |
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* permissions before doing so. |
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*/ |
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ret = vfs_ioctl(real.file, cmd, arg); |
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} |
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fdput(real); |
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return ret; |
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} |
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static long ovl_ioctl_set_flags(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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long ret; |
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struct inode *inode = file_inode(file); |
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|
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if (!inode_owner_or_capable(&init_user_ns, inode)) |
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return -EACCES; |
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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); |
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|
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/* |
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* Prevent copy up if immutable and has no CAP_LINUX_IMMUTABLE |
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* capability. |
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*/ |
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ret = -EPERM; |
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if (!ovl_has_upperdata(inode) && IS_IMMUTABLE(inode) && |
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!capable(CAP_LINUX_IMMUTABLE)) |
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goto unlock; |
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ret = ovl_maybe_copy_up(file_dentry(file), O_WRONLY); |
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if (ret) |
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goto unlock; |
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ret = ovl_real_ioctl(file, cmd, arg); |
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ovl_copyflags(ovl_inode_real(inode), inode); |
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unlock: |
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inode_unlock(inode); |
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mnt_drop_write_file(file); |
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return ret; |
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} |
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long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
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{ |
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long ret; |
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switch (cmd) { |
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case FS_IOC_GETFLAGS: |
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case FS_IOC_FSGETXATTR: |
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ret = ovl_real_ioctl(file, cmd, arg); |
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break; |
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case FS_IOC_FSSETXATTR: |
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case FS_IOC_SETFLAGS: |
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ret = ovl_ioctl_set_flags(file, cmd, arg); |
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break; |
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default: |
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ret = -ENOTTY; |
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} |
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return ret; |
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} |
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#ifdef CONFIG_COMPAT |
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long ovl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
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{ |
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switch (cmd) { |
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case FS_IOC32_GETFLAGS: |
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cmd = FS_IOC_GETFLAGS; |
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break; |
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|
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case FS_IOC32_SETFLAGS: |
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cmd = FS_IOC_SETFLAGS; |
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break; |
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default: |
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return -ENOIOCTLCMD; |
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} |
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return ovl_ioctl(file, cmd, arg); |
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} |
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#endif |
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enum ovl_copyop { |
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OVL_COPY, |
|
OVL_CLONE, |
|
OVL_DEDUPE, |
|
}; |
|
|
|
static loff_t ovl_copyfile(struct file *file_in, loff_t pos_in, |
|
struct file *file_out, loff_t pos_out, |
|
loff_t len, unsigned int flags, enum ovl_copyop op) |
|
{ |
|
struct inode *inode_out = file_inode(file_out); |
|
struct fd real_in, real_out; |
|
const struct cred *old_cred; |
|
loff_t ret; |
|
|
|
ret = ovl_real_fdget(file_out, &real_out); |
|
if (ret) |
|
return ret; |
|
|
|
ret = ovl_real_fdget(file_in, &real_in); |
|
if (ret) { |
|
fdput(real_out); |
|
return ret; |
|
} |
|
|
|
old_cred = ovl_override_creds(file_inode(file_out)->i_sb); |
|
switch (op) { |
|
case OVL_COPY: |
|
ret = vfs_copy_file_range(real_in.file, pos_in, |
|
real_out.file, pos_out, len, flags); |
|
break; |
|
|
|
case OVL_CLONE: |
|
ret = vfs_clone_file_range(real_in.file, pos_in, |
|
real_out.file, pos_out, len, flags); |
|
break; |
|
|
|
case OVL_DEDUPE: |
|
ret = vfs_dedupe_file_range_one(real_in.file, pos_in, |
|
real_out.file, pos_out, len, |
|
flags); |
|
break; |
|
} |
|
revert_creds(old_cred); |
|
|
|
/* Update size */ |
|
ovl_copyattr(ovl_inode_real(inode_out), inode_out); |
|
|
|
fdput(real_in); |
|
fdput(real_out); |
|
|
|
return ret; |
|
} |
|
|
|
static ssize_t ovl_copy_file_range(struct file *file_in, loff_t pos_in, |
|
struct file *file_out, loff_t pos_out, |
|
size_t len, unsigned int flags) |
|
{ |
|
return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, flags, |
|
OVL_COPY); |
|
} |
|
|
|
static loff_t ovl_remap_file_range(struct file *file_in, loff_t pos_in, |
|
struct file *file_out, loff_t pos_out, |
|
loff_t len, unsigned int remap_flags) |
|
{ |
|
enum ovl_copyop op; |
|
|
|
if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY)) |
|
return -EINVAL; |
|
|
|
if (remap_flags & REMAP_FILE_DEDUP) |
|
op = OVL_DEDUPE; |
|
else |
|
op = OVL_CLONE; |
|
|
|
/* |
|
* Don't copy up because of a dedupe request, this wouldn't make sense |
|
* most of the time (data would be duplicated instead of deduplicated). |
|
*/ |
|
if (op == OVL_DEDUPE && |
|
(!ovl_inode_upper(file_inode(file_in)) || |
|
!ovl_inode_upper(file_inode(file_out)))) |
|
return -EPERM; |
|
|
|
return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, |
|
remap_flags, op); |
|
} |
|
|
|
const struct file_operations ovl_file_operations = { |
|
.open = ovl_open, |
|
.release = ovl_release, |
|
.llseek = ovl_llseek, |
|
.read_iter = ovl_read_iter, |
|
.write_iter = ovl_write_iter, |
|
.fsync = ovl_fsync, |
|
.mmap = ovl_mmap, |
|
.fallocate = ovl_fallocate, |
|
.fadvise = ovl_fadvise, |
|
.unlocked_ioctl = ovl_ioctl, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = ovl_compat_ioctl, |
|
#endif |
|
.splice_read = generic_file_splice_read, |
|
.splice_write = iter_file_splice_write, |
|
|
|
.copy_file_range = ovl_copy_file_range, |
|
.remap_file_range = ovl_remap_file_range, |
|
}; |
|
|
|
int __init ovl_aio_request_cache_init(void) |
|
{ |
|
ovl_aio_request_cachep = kmem_cache_create("ovl_aio_req", |
|
sizeof(struct ovl_aio_req), |
|
0, SLAB_HWCACHE_ALIGN, NULL); |
|
if (!ovl_aio_request_cachep) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
void ovl_aio_request_cache_destroy(void) |
|
{ |
|
kmem_cache_destroy(ovl_aio_request_cachep); |
|
}
|
|
|