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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /fs/udf/file.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/udf/file.c')
-rw-r--r--fs/udf/file.c250
1 files changed, 250 insertions, 0 deletions
diff --git a/fs/udf/file.c b/fs/udf/file.c
new file mode 100644
index 0000000000..0ceac4b593
--- /dev/null
+++ b/fs/udf/file.c
@@ -0,0 +1,250 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * file.c
+ *
+ * PURPOSE
+ * File handling routines for the OSTA-UDF(tm) filesystem.
+ *
+ * COPYRIGHT
+ * (C) 1998-1999 Dave Boynton
+ * (C) 1998-2004 Ben Fennema
+ * (C) 1999-2000 Stelias Computing Inc
+ *
+ * HISTORY
+ *
+ * 10/02/98 dgb Attempt to integrate into udf.o
+ * 10/07/98 Switched to using generic_readpage, etc., like isofs
+ * And it works!
+ * 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but
+ * ICBTAG_FLAG_AD_IN_ICB.
+ * 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c
+ * 05/12/99 Preliminary file write support
+ */
+
+#include "udfdecl.h"
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/kernel.h>
+#include <linux/string.h> /* memset */
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/pagemap.h>
+#include <linux/uio.h>
+
+#include "udf_i.h"
+#include "udf_sb.h"
+
+static vm_fault_t udf_page_mkwrite(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct inode *inode = file_inode(vma->vm_file);
+ struct address_space *mapping = inode->i_mapping;
+ struct page *page = vmf->page;
+ loff_t size;
+ unsigned int end;
+ vm_fault_t ret = VM_FAULT_LOCKED;
+ int err;
+
+ sb_start_pagefault(inode->i_sb);
+ file_update_time(vma->vm_file);
+ filemap_invalidate_lock_shared(mapping);
+ lock_page(page);
+ size = i_size_read(inode);
+ if (page->mapping != inode->i_mapping || page_offset(page) >= size) {
+ unlock_page(page);
+ ret = VM_FAULT_NOPAGE;
+ goto out_unlock;
+ }
+ /* Space is already allocated for in-ICB file */
+ if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+ goto out_dirty;
+ if (page->index == size >> PAGE_SHIFT)
+ end = size & ~PAGE_MASK;
+ else
+ end = PAGE_SIZE;
+ err = __block_write_begin(page, 0, end, udf_get_block);
+ if (err) {
+ unlock_page(page);
+ ret = vmf_fs_error(err);
+ goto out_unlock;
+ }
+
+ block_commit_write(page, 0, end);
+out_dirty:
+ set_page_dirty(page);
+ wait_for_stable_page(page);
+out_unlock:
+ filemap_invalidate_unlock_shared(mapping);
+ sb_end_pagefault(inode->i_sb);
+ return ret;
+}
+
+static const struct vm_operations_struct udf_file_vm_ops = {
+ .fault = filemap_fault,
+ .map_pages = filemap_map_pages,
+ .page_mkwrite = udf_page_mkwrite,
+};
+
+static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+ ssize_t retval;
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file_inode(file);
+ struct udf_inode_info *iinfo = UDF_I(inode);
+
+ inode_lock(inode);
+
+ retval = generic_write_checks(iocb, from);
+ if (retval <= 0)
+ goto out;
+
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
+ inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
+ iocb->ki_pos + iov_iter_count(from))) {
+ filemap_invalidate_lock(inode->i_mapping);
+ retval = udf_expand_file_adinicb(inode);
+ filemap_invalidate_unlock(inode->i_mapping);
+ if (retval)
+ goto out;
+ }
+
+ retval = __generic_file_write_iter(iocb, from);
+out:
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && retval > 0) {
+ down_write(&iinfo->i_data_sem);
+ iinfo->i_lenAlloc = inode->i_size;
+ up_write(&iinfo->i_data_sem);
+ }
+ inode_unlock(inode);
+
+ if (retval > 0) {
+ mark_inode_dirty(inode);
+ retval = generic_write_sync(iocb, retval);
+ }
+
+ return retval;
+}
+
+long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+ long old_block, new_block;
+ int result;
+
+ if (file_permission(filp, MAY_READ) != 0) {
+ udf_debug("no permission to access inode %lu\n", inode->i_ino);
+ return -EPERM;
+ }
+
+ if (!arg && ((cmd == UDF_GETVOLIDENT) || (cmd == UDF_GETEASIZE) ||
+ (cmd == UDF_RELOCATE_BLOCKS) || (cmd == UDF_GETEABLOCK))) {
+ udf_debug("invalid argument to udf_ioctl\n");
+ return -EINVAL;
+ }
+
+ switch (cmd) {
+ case UDF_GETVOLIDENT:
+ if (copy_to_user((char __user *)arg,
+ UDF_SB(inode->i_sb)->s_volume_ident, 32))
+ return -EFAULT;
+ return 0;
+ case UDF_RELOCATE_BLOCKS:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (get_user(old_block, (long __user *)arg))
+ return -EFAULT;
+ result = udf_relocate_blocks(inode->i_sb,
+ old_block, &new_block);
+ if (result == 0)
+ result = put_user(new_block, (long __user *)arg);
+ return result;
+ case UDF_GETEASIZE:
+ return put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
+ case UDF_GETEABLOCK:
+ return copy_to_user((char __user *)arg,
+ UDF_I(inode)->i_data,
+ UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return 0;
+}
+
+static int udf_release_file(struct inode *inode, struct file *filp)
+{
+ if (filp->f_mode & FMODE_WRITE &&
+ atomic_read(&inode->i_writecount) == 1) {
+ /*
+ * Grab i_mutex to avoid races with writes changing i_size
+ * while we are running.
+ */
+ inode_lock(inode);
+ down_write(&UDF_I(inode)->i_data_sem);
+ udf_discard_prealloc(inode);
+ udf_truncate_tail_extent(inode);
+ up_write(&UDF_I(inode)->i_data_sem);
+ inode_unlock(inode);
+ }
+ return 0;
+}
+
+static int udf_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ file_accessed(file);
+ vma->vm_ops = &udf_file_vm_ops;
+
+ return 0;
+}
+
+const struct file_operations udf_file_operations = {
+ .read_iter = generic_file_read_iter,
+ .unlocked_ioctl = udf_ioctl,
+ .open = generic_file_open,
+ .mmap = udf_file_mmap,
+ .write_iter = udf_file_write_iter,
+ .release = udf_release_file,
+ .fsync = generic_file_fsync,
+ .splice_read = filemap_splice_read,
+ .splice_write = iter_file_splice_write,
+ .llseek = generic_file_llseek,
+};
+
+static int udf_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+ struct iattr *attr)
+{
+ struct inode *inode = d_inode(dentry);
+ struct super_block *sb = inode->i_sb;
+ int error;
+
+ error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
+ if (error)
+ return error;
+
+ if ((attr->ia_valid & ATTR_UID) &&
+ UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET) &&
+ !uid_eq(attr->ia_uid, UDF_SB(sb)->s_uid))
+ return -EPERM;
+ if ((attr->ia_valid & ATTR_GID) &&
+ UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET) &&
+ !gid_eq(attr->ia_gid, UDF_SB(sb)->s_gid))
+ return -EPERM;
+
+ if ((attr->ia_valid & ATTR_SIZE) &&
+ attr->ia_size != i_size_read(inode)) {
+ error = udf_setsize(inode, attr->ia_size);
+ if (error)
+ return error;
+ }
+
+ if (attr->ia_valid & ATTR_MODE)
+ udf_update_extra_perms(inode, attr->ia_mode);
+
+ setattr_copy(&nop_mnt_idmap, inode, attr);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+const struct inode_operations udf_file_inode_operations = {
+ .setattr = udf_setattr,
+};