251 lines
6.4 KiB
C
251 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* file.c
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*
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* PURPOSE
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* File handling routines for the OSTA-UDF(tm) filesystem.
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*
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* COPYRIGHT
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* (C) 1998-1999 Dave Boynton
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* (C) 1998-2004 Ben Fennema
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* (C) 1999-2000 Stelias Computing Inc
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*
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* HISTORY
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*
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* 10/02/98 dgb Attempt to integrate into udf.o
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* 10/07/98 Switched to using generic_readpage, etc., like isofs
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* And it works!
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* 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but
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* ICBTAG_FLAG_AD_IN_ICB.
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* 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c
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* 05/12/99 Preliminary file write support
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*/
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#include "udfdecl.h"
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/string.h> /* memset */
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/pagemap.h>
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#include <linux/uio.h>
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#include "udf_i.h"
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#include "udf_sb.h"
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static vm_fault_t udf_page_mkwrite(struct vm_fault *vmf)
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{
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struct vm_area_struct *vma = vmf->vma;
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struct inode *inode = file_inode(vma->vm_file);
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struct address_space *mapping = inode->i_mapping;
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struct page *page = vmf->page;
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loff_t size;
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unsigned int end;
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vm_fault_t ret = VM_FAULT_LOCKED;
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int err;
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sb_start_pagefault(inode->i_sb);
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file_update_time(vma->vm_file);
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filemap_invalidate_lock_shared(mapping);
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lock_page(page);
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size = i_size_read(inode);
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if (page->mapping != inode->i_mapping || page_offset(page) >= size) {
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unlock_page(page);
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ret = VM_FAULT_NOPAGE;
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goto out_unlock;
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}
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/* Space is already allocated for in-ICB file */
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if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
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goto out_dirty;
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if (page->index == size >> PAGE_SHIFT)
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end = size & ~PAGE_MASK;
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else
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end = PAGE_SIZE;
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err = __block_write_begin(page, 0, end, udf_get_block);
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if (!err)
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err = block_commit_write(page, 0, end);
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if (err < 0) {
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unlock_page(page);
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ret = block_page_mkwrite_return(err);
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goto out_unlock;
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}
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out_dirty:
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set_page_dirty(page);
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wait_for_stable_page(page);
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out_unlock:
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filemap_invalidate_unlock_shared(mapping);
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sb_end_pagefault(inode->i_sb);
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return ret;
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}
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static const struct vm_operations_struct udf_file_vm_ops = {
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.fault = filemap_fault,
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.map_pages = filemap_map_pages,
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.page_mkwrite = udf_page_mkwrite,
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};
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static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
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{
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ssize_t retval;
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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 udf_inode_info *iinfo = UDF_I(inode);
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inode_lock(inode);
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retval = generic_write_checks(iocb, from);
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if (retval <= 0)
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goto out;
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
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inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
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iocb->ki_pos + iov_iter_count(from))) {
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filemap_invalidate_lock(inode->i_mapping);
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retval = udf_expand_file_adinicb(inode);
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filemap_invalidate_unlock(inode->i_mapping);
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if (retval)
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goto out;
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}
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retval = __generic_file_write_iter(iocb, from);
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out:
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && retval > 0) {
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down_write(&iinfo->i_data_sem);
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iinfo->i_lenAlloc = inode->i_size;
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up_write(&iinfo->i_data_sem);
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}
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inode_unlock(inode);
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if (retval > 0) {
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mark_inode_dirty(inode);
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retval = generic_write_sync(iocb, retval);
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}
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return retval;
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}
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long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = file_inode(filp);
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long old_block, new_block;
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int result;
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if (file_permission(filp, MAY_READ) != 0) {
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udf_debug("no permission to access inode %lu\n", inode->i_ino);
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return -EPERM;
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}
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if (!arg && ((cmd == UDF_GETVOLIDENT) || (cmd == UDF_GETEASIZE) ||
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(cmd == UDF_RELOCATE_BLOCKS) || (cmd == UDF_GETEABLOCK))) {
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udf_debug("invalid argument to udf_ioctl\n");
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return -EINVAL;
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}
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switch (cmd) {
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case UDF_GETVOLIDENT:
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if (copy_to_user((char __user *)arg,
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UDF_SB(inode->i_sb)->s_volume_ident, 32))
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return -EFAULT;
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return 0;
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case UDF_RELOCATE_BLOCKS:
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (get_user(old_block, (long __user *)arg))
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return -EFAULT;
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result = udf_relocate_blocks(inode->i_sb,
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old_block, &new_block);
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if (result == 0)
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result = put_user(new_block, (long __user *)arg);
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return result;
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case UDF_GETEASIZE:
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return put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
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case UDF_GETEABLOCK:
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return copy_to_user((char __user *)arg,
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UDF_I(inode)->i_data,
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UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
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default:
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return -ENOIOCTLCMD;
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}
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return 0;
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}
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static int udf_release_file(struct inode *inode, struct file *filp)
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{
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if (filp->f_mode & FMODE_WRITE &&
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atomic_read(&inode->i_writecount) == 1) {
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/*
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* Grab i_mutex to avoid races with writes changing i_size
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* while we are running.
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*/
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inode_lock(inode);
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down_write(&UDF_I(inode)->i_data_sem);
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udf_discard_prealloc(inode);
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udf_truncate_tail_extent(inode);
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up_write(&UDF_I(inode)->i_data_sem);
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inode_unlock(inode);
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}
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return 0;
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}
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static int udf_file_mmap(struct file *file, struct vm_area_struct *vma)
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{
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file_accessed(file);
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vma->vm_ops = &udf_file_vm_ops;
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return 0;
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}
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const struct file_operations udf_file_operations = {
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.read_iter = generic_file_read_iter,
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.unlocked_ioctl = udf_ioctl,
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.open = generic_file_open,
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.mmap = udf_file_mmap,
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.write_iter = udf_file_write_iter,
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.release = udf_release_file,
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.fsync = generic_file_fsync,
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.splice_read = filemap_splice_read,
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.splice_write = iter_file_splice_write,
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.llseek = generic_file_llseek,
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};
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static int udf_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
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struct iattr *attr)
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{
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struct inode *inode = d_inode(dentry);
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struct super_block *sb = inode->i_sb;
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int error;
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error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
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if (error)
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return error;
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if ((attr->ia_valid & ATTR_UID) &&
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UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET) &&
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!uid_eq(attr->ia_uid, UDF_SB(sb)->s_uid))
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return -EPERM;
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if ((attr->ia_valid & ATTR_GID) &&
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UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET) &&
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!gid_eq(attr->ia_gid, UDF_SB(sb)->s_gid))
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return -EPERM;
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if ((attr->ia_valid & ATTR_SIZE) &&
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attr->ia_size != i_size_read(inode)) {
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error = udf_setsize(inode, attr->ia_size);
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if (error)
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return error;
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}
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if (attr->ia_valid & ATTR_MODE)
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udf_update_extra_perms(inode, attr->ia_mode);
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setattr_copy(&nop_mnt_idmap, inode, attr);
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mark_inode_dirty(inode);
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return 0;
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}
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const struct inode_operations udf_file_inode_operations = {
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.setattr = udf_setattr,
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};
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