1014 lines
26 KiB
C
1014 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* namei.c
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*
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* PURPOSE
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* Inode name handling routines for the OSTA-UDF(tm) filesystem.
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*
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* COPYRIGHT
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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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* 12/12/98 blf Created. Split out the lookup code from dir.c
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* 04/19/99 blf link, mknod, symlink support
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*/
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#include "udfdecl.h"
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#include "udf_i.h"
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#include "udf_sb.h"
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/crc-itu-t.h>
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#include <linux/exportfs.h>
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#include <linux/iversion.h>
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static inline int udf_match(int len1, const unsigned char *name1, int len2,
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const unsigned char *name2)
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{
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if (len1 != len2)
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return 0;
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return !memcmp(name1, name2, len1);
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}
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/**
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* udf_fiiter_find_entry - find entry in given directory.
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*
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* @dir: directory inode to search in
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* @child: qstr of the name
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* @iter: iter to use for searching
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*
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* This function searches in the directory @dir for a file name @child. When
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* found, @iter points to the position in the directory with given entry.
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*
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* Returns 0 on success, < 0 on error (including -ENOENT).
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*/
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static int udf_fiiter_find_entry(struct inode *dir, const struct qstr *child,
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struct udf_fileident_iter *iter)
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{
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int flen;
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unsigned char *fname = NULL;
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struct super_block *sb = dir->i_sb;
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int isdotdot = child->len == 2 &&
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child->name[0] == '.' && child->name[1] == '.';
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int ret;
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fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
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if (!fname)
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return -ENOMEM;
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for (ret = udf_fiiter_init(iter, dir, 0);
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!ret && iter->pos < dir->i_size;
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ret = udf_fiiter_advance(iter)) {
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if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
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if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
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continue;
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}
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if (iter->fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) {
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if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
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continue;
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}
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if ((iter->fi.fileCharacteristics & FID_FILE_CHAR_PARENT) &&
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isdotdot)
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goto out_ok;
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if (!iter->fi.lengthFileIdent)
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continue;
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flen = udf_get_filename(sb, iter->name,
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iter->fi.lengthFileIdent, fname, UDF_NAME_LEN);
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if (flen < 0) {
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ret = flen;
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goto out_err;
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}
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if (udf_match(flen, fname, child->len, child->name))
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goto out_ok;
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}
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if (!ret)
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ret = -ENOENT;
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out_err:
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udf_fiiter_release(iter);
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out_ok:
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kfree(fname);
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return ret;
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}
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static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags)
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{
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struct inode *inode = NULL;
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struct udf_fileident_iter iter;
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int err;
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if (dentry->d_name.len > UDF_NAME_LEN)
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return ERR_PTR(-ENAMETOOLONG);
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err = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
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if (err < 0 && err != -ENOENT)
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return ERR_PTR(err);
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if (err == 0) {
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struct kernel_lb_addr loc;
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loc = lelb_to_cpu(iter.fi.icb.extLocation);
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udf_fiiter_release(&iter);
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inode = udf_iget(dir->i_sb, &loc);
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}
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return d_splice_alias(inode, dentry);
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}
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static int udf_expand_dir_adinicb(struct inode *inode, udf_pblk_t *block)
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{
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udf_pblk_t newblock;
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struct buffer_head *dbh = NULL;
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struct kernel_lb_addr eloc;
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struct extent_position epos;
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uint8_t alloctype;
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struct udf_inode_info *iinfo = UDF_I(inode);
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struct udf_fileident_iter iter;
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uint8_t *impuse;
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int ret;
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if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
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alloctype = ICBTAG_FLAG_AD_SHORT;
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else
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alloctype = ICBTAG_FLAG_AD_LONG;
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if (!inode->i_size) {
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iinfo->i_alloc_type = alloctype;
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mark_inode_dirty(inode);
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return 0;
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}
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/* alloc block, and copy data to it */
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*block = udf_new_block(inode->i_sb, inode,
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iinfo->i_location.partitionReferenceNum,
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iinfo->i_location.logicalBlockNum, &ret);
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if (!(*block))
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return ret;
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newblock = udf_get_pblock(inode->i_sb, *block,
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iinfo->i_location.partitionReferenceNum,
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0);
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if (newblock == 0xffffffff)
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return -EFSCORRUPTED;
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dbh = sb_getblk(inode->i_sb, newblock);
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if (!dbh)
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return -ENOMEM;
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lock_buffer(dbh);
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memcpy(dbh->b_data, iinfo->i_data, inode->i_size);
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memset(dbh->b_data + inode->i_size, 0,
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inode->i_sb->s_blocksize - inode->i_size);
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set_buffer_uptodate(dbh);
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unlock_buffer(dbh);
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/* Drop inline data, add block instead */
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iinfo->i_alloc_type = alloctype;
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memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc);
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iinfo->i_lenAlloc = 0;
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eloc.logicalBlockNum = *block;
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eloc.partitionReferenceNum =
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iinfo->i_location.partitionReferenceNum;
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iinfo->i_lenExtents = inode->i_size;
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epos.bh = NULL;
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epos.block = iinfo->i_location;
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epos.offset = udf_file_entry_alloc_offset(inode);
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ret = udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
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brelse(epos.bh);
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if (ret < 0) {
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brelse(dbh);
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udf_free_blocks(inode->i_sb, inode, &eloc, 0, 1);
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return ret;
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}
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mark_inode_dirty(inode);
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/* Now fixup tags in moved directory entries */
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for (ret = udf_fiiter_init(&iter, inode, 0);
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!ret && iter.pos < inode->i_size;
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ret = udf_fiiter_advance(&iter)) {
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iter.fi.descTag.tagLocation = cpu_to_le32(*block);
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if (iter.fi.lengthOfImpUse != cpu_to_le16(0))
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impuse = dbh->b_data + iter.pos +
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sizeof(struct fileIdentDesc);
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else
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impuse = NULL;
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udf_fiiter_write_fi(&iter, impuse);
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}
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brelse(dbh);
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/*
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* We don't expect the iteration to fail as the directory has been
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* already verified to be correct
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*/
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WARN_ON_ONCE(ret);
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udf_fiiter_release(&iter);
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return 0;
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}
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static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry,
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struct udf_fileident_iter *iter)
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{
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struct udf_inode_info *dinfo = UDF_I(dir);
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int nfidlen, namelen = 0;
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int ret;
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int off, blksize = 1 << dir->i_blkbits;
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udf_pblk_t block;
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char name[UDF_NAME_LEN_CS0];
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if (dentry) {
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namelen = udf_put_filename(dir->i_sb, dentry->d_name.name,
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dentry->d_name.len,
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name, UDF_NAME_LEN_CS0);
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if (!namelen)
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return -ENAMETOOLONG;
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}
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nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
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for (ret = udf_fiiter_init(iter, dir, 0);
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!ret && iter->pos < dir->i_size;
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ret = udf_fiiter_advance(iter)) {
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if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
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if (udf_dir_entry_len(&iter->fi) == nfidlen) {
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iter->fi.descTag.tagSerialNum = cpu_to_le16(1);
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iter->fi.fileVersionNum = cpu_to_le16(1);
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iter->fi.fileCharacteristics = 0;
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iter->fi.lengthFileIdent = namelen;
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iter->fi.lengthOfImpUse = cpu_to_le16(0);
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memcpy(iter->namebuf, name, namelen);
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iter->name = iter->namebuf;
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return 0;
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}
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}
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}
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if (ret) {
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udf_fiiter_release(iter);
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return ret;
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}
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
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blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) {
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udf_fiiter_release(iter);
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ret = udf_expand_dir_adinicb(dir, &block);
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if (ret)
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return ret;
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ret = udf_fiiter_init(iter, dir, dir->i_size);
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if (ret < 0)
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return ret;
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}
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/* Get blocknumber to use for entry tag */
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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block = dinfo->i_location.logicalBlockNum;
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} else {
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block = iter->eloc.logicalBlockNum +
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((iter->elen - 1) >> dir->i_blkbits);
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}
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off = iter->pos & (blksize - 1);
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if (!off)
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off = blksize;
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/* Entry fits into current block? */
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if (blksize - udf_ext0_offset(dir) - off >= nfidlen)
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goto store_fi;
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ret = udf_fiiter_append_blk(iter);
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if (ret) {
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udf_fiiter_release(iter);
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return ret;
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}
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/* Entry will be completely in the new block? Update tag location... */
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if (!(iter->pos & (blksize - 1)))
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block = iter->eloc.logicalBlockNum +
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((iter->elen - 1) >> dir->i_blkbits);
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store_fi:
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memset(&iter->fi, 0, sizeof(struct fileIdentDesc));
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if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200)
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udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block,
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sizeof(struct tag));
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else
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udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block,
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sizeof(struct tag));
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iter->fi.fileVersionNum = cpu_to_le16(1);
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iter->fi.lengthFileIdent = namelen;
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iter->fi.lengthOfImpUse = cpu_to_le16(0);
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memcpy(iter->namebuf, name, namelen);
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iter->name = iter->namebuf;
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dir->i_size += nfidlen;
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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dinfo->i_lenAlloc += nfidlen;
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} else {
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/* Truncate last extent to proper size */
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udf_fiiter_update_elen(iter, iter->elen -
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(dinfo->i_lenExtents - dir->i_size));
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}
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mark_inode_dirty(dir);
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return 0;
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}
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static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter)
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{
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iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED;
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if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT))
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memset(&iter->fi.icb, 0x00, sizeof(struct long_ad));
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udf_fiiter_write_fi(iter, NULL);
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}
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static void udf_add_fid_counter(struct super_block *sb, bool dir, int val)
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{
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struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
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if (!lvidiu)
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return;
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mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
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if (dir)
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le32_add_cpu(&lvidiu->numDirs, val);
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else
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le32_add_cpu(&lvidiu->numFiles, val);
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udf_updated_lvid(sb);
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mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
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}
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static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
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{
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struct udf_inode_info *iinfo = UDF_I(inode);
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struct inode *dir = d_inode(dentry->d_parent);
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struct udf_fileident_iter iter;
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int err;
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err = udf_fiiter_add_entry(dir, dentry, &iter);
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if (err) {
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inode_dec_link_count(inode);
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discard_new_inode(inode);
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return err;
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}
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iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
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iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
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*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
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cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
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udf_fiiter_write_fi(&iter, NULL);
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inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
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mark_inode_dirty(dir);
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udf_fiiter_release(&iter);
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udf_add_fid_counter(dir->i_sb, false, 1);
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d_instantiate_new(dentry, inode);
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return 0;
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}
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static int udf_create(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode, bool excl)
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{
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struct inode *inode = udf_new_inode(dir, mode);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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inode->i_data.a_ops = &udf_aops;
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inode->i_op = &udf_file_inode_operations;
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inode->i_fop = &udf_file_operations;
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mark_inode_dirty(inode);
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return udf_add_nondir(dentry, inode);
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}
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static int udf_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
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struct file *file, umode_t mode)
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{
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struct inode *inode = udf_new_inode(dir, mode);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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inode->i_data.a_ops = &udf_aops;
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inode->i_op = &udf_file_inode_operations;
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inode->i_fop = &udf_file_operations;
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mark_inode_dirty(inode);
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d_tmpfile(file, inode);
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unlock_new_inode(inode);
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return finish_open_simple(file, 0);
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}
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static int udf_mknod(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode, dev_t rdev)
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{
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struct inode *inode;
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if (!old_valid_dev(rdev))
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return -EINVAL;
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inode = udf_new_inode(dir, mode);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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init_special_inode(inode, mode, rdev);
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return udf_add_nondir(dentry, inode);
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}
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static int udf_mkdir(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode)
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{
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struct inode *inode;
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struct udf_fileident_iter iter;
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int err;
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struct udf_inode_info *dinfo = UDF_I(dir);
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struct udf_inode_info *iinfo;
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inode = udf_new_inode(dir, S_IFDIR | mode);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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iinfo = UDF_I(inode);
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inode->i_op = &udf_dir_inode_operations;
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inode->i_fop = &udf_dir_operations;
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err = udf_fiiter_add_entry(inode, NULL, &iter);
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if (err) {
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clear_nlink(inode);
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discard_new_inode(inode);
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return err;
|
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}
|
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set_nlink(inode, 2);
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iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
|
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iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
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*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
|
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cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
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iter.fi.fileCharacteristics =
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FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
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udf_fiiter_write_fi(&iter, NULL);
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udf_fiiter_release(&iter);
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mark_inode_dirty(inode);
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err = udf_fiiter_add_entry(dir, dentry, &iter);
|
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if (err) {
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clear_nlink(inode);
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discard_new_inode(inode);
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return err;
|
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}
|
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iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
|
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iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
|
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*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
|
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cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
|
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iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
|
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udf_fiiter_write_fi(&iter, NULL);
|
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udf_fiiter_release(&iter);
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udf_add_fid_counter(dir->i_sb, true, 1);
|
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inc_nlink(dir);
|
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inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
|
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mark_inode_dirty(dir);
|
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d_instantiate_new(dentry, inode);
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|
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return 0;
|
|
}
|
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|
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static int empty_dir(struct inode *dir)
|
|
{
|
|
struct udf_fileident_iter iter;
|
|
int ret;
|
|
|
|
for (ret = udf_fiiter_init(&iter, dir, 0);
|
|
!ret && iter.pos < dir->i_size;
|
|
ret = udf_fiiter_advance(&iter)) {
|
|
if (iter.fi.lengthFileIdent &&
|
|
!(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) {
|
|
udf_fiiter_release(&iter);
|
|
return 0;
|
|
}
|
|
}
|
|
udf_fiiter_release(&iter);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int udf_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int ret;
|
|
struct inode *inode = d_inode(dentry);
|
|
struct udf_fileident_iter iter;
|
|
struct kernel_lb_addr tloc;
|
|
|
|
ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = -EFSCORRUPTED;
|
|
tloc = lelb_to_cpu(iter.fi.icb.extLocation);
|
|
if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
|
|
goto end_rmdir;
|
|
ret = -ENOTEMPTY;
|
|
if (!empty_dir(inode))
|
|
goto end_rmdir;
|
|
udf_fiiter_delete_entry(&iter);
|
|
if (inode->i_nlink != 2)
|
|
udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
|
|
inode->i_nlink);
|
|
clear_nlink(inode);
|
|
inode->i_size = 0;
|
|
inode_dec_link_count(dir);
|
|
udf_add_fid_counter(dir->i_sb, true, -1);
|
|
inode_set_mtime_to_ts(dir,
|
|
inode_set_ctime_to_ts(dir, inode_set_ctime_current(inode)));
|
|
mark_inode_dirty(dir);
|
|
ret = 0;
|
|
end_rmdir:
|
|
udf_fiiter_release(&iter);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int udf_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int ret;
|
|
struct inode *inode = d_inode(dentry);
|
|
struct udf_fileident_iter iter;
|
|
struct kernel_lb_addr tloc;
|
|
|
|
ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = -EFSCORRUPTED;
|
|
tloc = lelb_to_cpu(iter.fi.icb.extLocation);
|
|
if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
|
|
goto end_unlink;
|
|
|
|
if (!inode->i_nlink) {
|
|
udf_debug("Deleting nonexistent file (%lu), %u\n",
|
|
inode->i_ino, inode->i_nlink);
|
|
set_nlink(inode, 1);
|
|
}
|
|
udf_fiiter_delete_entry(&iter);
|
|
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
|
|
mark_inode_dirty(dir);
|
|
inode_dec_link_count(inode);
|
|
udf_add_fid_counter(dir->i_sb, false, -1);
|
|
inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
|
|
ret = 0;
|
|
end_unlink:
|
|
udf_fiiter_release(&iter);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, const char *symname)
|
|
{
|
|
struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
|
|
struct pathComponent *pc;
|
|
const char *compstart;
|
|
struct extent_position epos = {};
|
|
int eoffset, elen = 0;
|
|
uint8_t *ea;
|
|
int err;
|
|
udf_pblk_t block;
|
|
unsigned char *name = NULL;
|
|
int namelen;
|
|
struct udf_inode_info *iinfo;
|
|
struct super_block *sb = dir->i_sb;
|
|
|
|
if (IS_ERR(inode))
|
|
return PTR_ERR(inode);
|
|
|
|
iinfo = UDF_I(inode);
|
|
down_write(&iinfo->i_data_sem);
|
|
name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
|
|
if (!name) {
|
|
err = -ENOMEM;
|
|
goto out_no_entry;
|
|
}
|
|
|
|
inode->i_data.a_ops = &udf_symlink_aops;
|
|
inode->i_op = &udf_symlink_inode_operations;
|
|
inode_nohighmem(inode);
|
|
|
|
if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
|
|
struct kernel_lb_addr eloc;
|
|
uint32_t bsize;
|
|
|
|
block = udf_new_block(sb, inode,
|
|
iinfo->i_location.partitionReferenceNum,
|
|
iinfo->i_location.logicalBlockNum, &err);
|
|
if (!block)
|
|
goto out_no_entry;
|
|
epos.block = iinfo->i_location;
|
|
epos.offset = udf_file_entry_alloc_offset(inode);
|
|
epos.bh = NULL;
|
|
eloc.logicalBlockNum = block;
|
|
eloc.partitionReferenceNum =
|
|
iinfo->i_location.partitionReferenceNum;
|
|
bsize = sb->s_blocksize;
|
|
iinfo->i_lenExtents = bsize;
|
|
err = udf_add_aext(inode, &epos, &eloc, bsize, 0);
|
|
brelse(epos.bh);
|
|
if (err < 0) {
|
|
udf_free_blocks(sb, inode, &eloc, 0, 1);
|
|
goto out_no_entry;
|
|
}
|
|
|
|
block = udf_get_pblock(sb, block,
|
|
iinfo->i_location.partitionReferenceNum,
|
|
0);
|
|
epos.bh = sb_getblk(sb, block);
|
|
if (unlikely(!epos.bh)) {
|
|
err = -ENOMEM;
|
|
udf_free_blocks(sb, inode, &eloc, 0, 1);
|
|
goto out_no_entry;
|
|
}
|
|
lock_buffer(epos.bh);
|
|
memset(epos.bh->b_data, 0x00, bsize);
|
|
set_buffer_uptodate(epos.bh);
|
|
unlock_buffer(epos.bh);
|
|
mark_buffer_dirty_inode(epos.bh, inode);
|
|
ea = epos.bh->b_data + udf_ext0_offset(inode);
|
|
} else
|
|
ea = iinfo->i_data + iinfo->i_lenEAttr;
|
|
|
|
eoffset = sb->s_blocksize - udf_ext0_offset(inode);
|
|
pc = (struct pathComponent *)ea;
|
|
|
|
if (*symname == '/') {
|
|
do {
|
|
symname++;
|
|
} while (*symname == '/');
|
|
|
|
pc->componentType = 1;
|
|
pc->lengthComponentIdent = 0;
|
|
pc->componentFileVersionNum = 0;
|
|
elen += sizeof(struct pathComponent);
|
|
}
|
|
|
|
err = -ENAMETOOLONG;
|
|
|
|
while (*symname) {
|
|
if (elen + sizeof(struct pathComponent) > eoffset)
|
|
goto out_no_entry;
|
|
|
|
pc = (struct pathComponent *)(ea + elen);
|
|
|
|
compstart = symname;
|
|
|
|
do {
|
|
symname++;
|
|
} while (*symname && *symname != '/');
|
|
|
|
pc->componentType = 5;
|
|
pc->lengthComponentIdent = 0;
|
|
pc->componentFileVersionNum = 0;
|
|
if (compstart[0] == '.') {
|
|
if ((symname - compstart) == 1)
|
|
pc->componentType = 4;
|
|
else if ((symname - compstart) == 2 &&
|
|
compstart[1] == '.')
|
|
pc->componentType = 3;
|
|
}
|
|
|
|
if (pc->componentType == 5) {
|
|
namelen = udf_put_filename(sb, compstart,
|
|
symname - compstart,
|
|
name, UDF_NAME_LEN_CS0);
|
|
if (!namelen)
|
|
goto out_no_entry;
|
|
|
|
if (elen + sizeof(struct pathComponent) + namelen >
|
|
eoffset)
|
|
goto out_no_entry;
|
|
else
|
|
pc->lengthComponentIdent = namelen;
|
|
|
|
memcpy(pc->componentIdent, name, namelen);
|
|
}
|
|
|
|
elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
|
|
|
|
if (*symname) {
|
|
do {
|
|
symname++;
|
|
} while (*symname == '/');
|
|
}
|
|
}
|
|
|
|
brelse(epos.bh);
|
|
inode->i_size = elen;
|
|
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
|
|
iinfo->i_lenAlloc = inode->i_size;
|
|
else
|
|
udf_truncate_tail_extent(inode);
|
|
mark_inode_dirty(inode);
|
|
up_write(&iinfo->i_data_sem);
|
|
|
|
err = udf_add_nondir(dentry, inode);
|
|
out:
|
|
kfree(name);
|
|
return err;
|
|
|
|
out_no_entry:
|
|
up_write(&iinfo->i_data_sem);
|
|
inode_dec_link_count(inode);
|
|
discard_new_inode(inode);
|
|
goto out;
|
|
}
|
|
|
|
static int udf_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct inode *inode = d_inode(old_dentry);
|
|
struct udf_fileident_iter iter;
|
|
int err;
|
|
|
|
err = udf_fiiter_add_entry(dir, dentry, &iter);
|
|
if (err)
|
|
return err;
|
|
iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
|
|
iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
|
|
if (UDF_SB(inode->i_sb)->s_lvid_bh) {
|
|
*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
|
|
cpu_to_le32(lvid_get_unique_id(inode->i_sb));
|
|
}
|
|
udf_fiiter_write_fi(&iter, NULL);
|
|
udf_fiiter_release(&iter);
|
|
|
|
inc_nlink(inode);
|
|
udf_add_fid_counter(dir->i_sb, false, 1);
|
|
inode_set_ctime_current(inode);
|
|
mark_inode_dirty(inode);
|
|
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
|
|
mark_inode_dirty(dir);
|
|
ihold(inode);
|
|
d_instantiate(dentry, inode);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Anybody can rename anything with this: the permission checks are left to the
|
|
* higher-level routines.
|
|
*/
|
|
static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
|
|
struct dentry *old_dentry, struct inode *new_dir,
|
|
struct dentry *new_dentry, unsigned int flags)
|
|
{
|
|
struct inode *old_inode = d_inode(old_dentry);
|
|
struct inode *new_inode = d_inode(new_dentry);
|
|
struct udf_fileident_iter oiter, niter, diriter;
|
|
bool has_diriter = false, is_dir = false;
|
|
int retval;
|
|
struct kernel_lb_addr tloc;
|
|
|
|
if (flags & ~RENAME_NOREPLACE)
|
|
return -EINVAL;
|
|
|
|
retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
|
|
if (retval)
|
|
return retval;
|
|
|
|
tloc = lelb_to_cpu(oiter.fi.icb.extLocation);
|
|
if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) {
|
|
retval = -ENOENT;
|
|
goto out_oiter;
|
|
}
|
|
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
if (new_inode) {
|
|
retval = -ENOTEMPTY;
|
|
if (!empty_dir(new_inode))
|
|
goto out_oiter;
|
|
}
|
|
is_dir = true;
|
|
}
|
|
if (is_dir && old_dir != new_dir) {
|
|
retval = udf_fiiter_find_entry(old_inode, &dotdot_name,
|
|
&diriter);
|
|
if (retval == -ENOENT) {
|
|
udf_err(old_inode->i_sb,
|
|
"directory (ino %lu) has no '..' entry\n",
|
|
old_inode->i_ino);
|
|
retval = -EFSCORRUPTED;
|
|
}
|
|
if (retval)
|
|
goto out_oiter;
|
|
has_diriter = true;
|
|
tloc = lelb_to_cpu(diriter.fi.icb.extLocation);
|
|
if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
|
|
old_dir->i_ino) {
|
|
retval = -EFSCORRUPTED;
|
|
udf_err(old_inode->i_sb,
|
|
"directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n",
|
|
old_inode->i_ino, old_dir->i_ino,
|
|
udf_get_lb_pblock(old_inode->i_sb, &tloc, 0));
|
|
goto out_oiter;
|
|
}
|
|
}
|
|
|
|
retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter);
|
|
if (retval && retval != -ENOENT)
|
|
goto out_oiter;
|
|
/* Entry found but not passed by VFS? */
|
|
if (!retval && !new_inode) {
|
|
retval = -EFSCORRUPTED;
|
|
udf_fiiter_release(&niter);
|
|
goto out_oiter;
|
|
}
|
|
/* Entry not found? Need to add one... */
|
|
if (retval) {
|
|
udf_fiiter_release(&niter);
|
|
retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter);
|
|
if (retval)
|
|
goto out_oiter;
|
|
}
|
|
|
|
/*
|
|
* Like most other Unix systems, set the ctime for inodes on a
|
|
* rename.
|
|
*/
|
|
inode_set_ctime_current(old_inode);
|
|
mark_inode_dirty(old_inode);
|
|
|
|
/*
|
|
* ok, that's it
|
|
*/
|
|
niter.fi.fileVersionNum = oiter.fi.fileVersionNum;
|
|
niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics;
|
|
memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb));
|
|
udf_fiiter_write_fi(&niter, NULL);
|
|
udf_fiiter_release(&niter);
|
|
|
|
/*
|
|
* The old entry may have moved due to new entry allocation. Find it
|
|
* again.
|
|
*/
|
|
udf_fiiter_release(&oiter);
|
|
retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
|
|
if (retval) {
|
|
udf_err(old_dir->i_sb,
|
|
"failed to find renamed entry again in directory (ino %lu)\n",
|
|
old_dir->i_ino);
|
|
} else {
|
|
udf_fiiter_delete_entry(&oiter);
|
|
udf_fiiter_release(&oiter);
|
|
}
|
|
|
|
if (new_inode) {
|
|
inode_set_ctime_current(new_inode);
|
|
inode_dec_link_count(new_inode);
|
|
udf_add_fid_counter(old_dir->i_sb, S_ISDIR(new_inode->i_mode),
|
|
-1);
|
|
}
|
|
inode_set_mtime_to_ts(old_dir, inode_set_ctime_current(old_dir));
|
|
inode_set_mtime_to_ts(new_dir, inode_set_ctime_current(new_dir));
|
|
mark_inode_dirty(old_dir);
|
|
mark_inode_dirty(new_dir);
|
|
|
|
if (has_diriter) {
|
|
diriter.fi.icb.extLocation =
|
|
cpu_to_lelb(UDF_I(new_dir)->i_location);
|
|
udf_update_tag((char *)&diriter.fi,
|
|
udf_dir_entry_len(&diriter.fi));
|
|
udf_fiiter_write_fi(&diriter, NULL);
|
|
udf_fiiter_release(&diriter);
|
|
}
|
|
|
|
if (is_dir) {
|
|
inode_dec_link_count(old_dir);
|
|
if (new_inode)
|
|
inode_dec_link_count(new_inode);
|
|
else {
|
|
inc_nlink(new_dir);
|
|
mark_inode_dirty(new_dir);
|
|
}
|
|
}
|
|
return 0;
|
|
out_oiter:
|
|
if (has_diriter)
|
|
udf_fiiter_release(&diriter);
|
|
udf_fiiter_release(&oiter);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static struct dentry *udf_get_parent(struct dentry *child)
|
|
{
|
|
struct kernel_lb_addr tloc;
|
|
struct udf_fileident_iter iter;
|
|
int err;
|
|
|
|
err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
tloc = lelb_to_cpu(iter.fi.icb.extLocation);
|
|
udf_fiiter_release(&iter);
|
|
return d_obtain_alias(udf_iget(child->d_sb, &tloc));
|
|
}
|
|
|
|
|
|
static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
|
|
u16 partref, __u32 generation)
|
|
{
|
|
struct inode *inode;
|
|
struct kernel_lb_addr loc;
|
|
|
|
if (block == 0)
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
loc.logicalBlockNum = block;
|
|
loc.partitionReferenceNum = partref;
|
|
inode = udf_iget(sb, &loc);
|
|
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
|
|
if (generation && inode->i_generation != generation) {
|
|
iput(inode);
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
return d_obtain_alias(inode);
|
|
}
|
|
|
|
static struct dentry *udf_fh_to_dentry(struct super_block *sb,
|
|
struct fid *fid, int fh_len, int fh_type)
|
|
{
|
|
if (fh_len < 3 ||
|
|
(fh_type != FILEID_UDF_WITH_PARENT &&
|
|
fh_type != FILEID_UDF_WITHOUT_PARENT))
|
|
return NULL;
|
|
|
|
return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
|
|
fid->udf.generation);
|
|
}
|
|
|
|
static struct dentry *udf_fh_to_parent(struct super_block *sb,
|
|
struct fid *fid, int fh_len, int fh_type)
|
|
{
|
|
if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
|
|
return NULL;
|
|
|
|
return udf_nfs_get_inode(sb, fid->udf.parent_block,
|
|
fid->udf.parent_partref,
|
|
fid->udf.parent_generation);
|
|
}
|
|
static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
|
|
struct inode *parent)
|
|
{
|
|
int len = *lenp;
|
|
struct kernel_lb_addr location = UDF_I(inode)->i_location;
|
|
struct fid *fid = (struct fid *)fh;
|
|
int type = FILEID_UDF_WITHOUT_PARENT;
|
|
|
|
if (parent && (len < 5)) {
|
|
*lenp = 5;
|
|
return FILEID_INVALID;
|
|
} else if (len < 3) {
|
|
*lenp = 3;
|
|
return FILEID_INVALID;
|
|
}
|
|
|
|
*lenp = 3;
|
|
fid->udf.block = location.logicalBlockNum;
|
|
fid->udf.partref = location.partitionReferenceNum;
|
|
fid->udf.parent_partref = 0;
|
|
fid->udf.generation = inode->i_generation;
|
|
|
|
if (parent) {
|
|
location = UDF_I(parent)->i_location;
|
|
fid->udf.parent_block = location.logicalBlockNum;
|
|
fid->udf.parent_partref = location.partitionReferenceNum;
|
|
fid->udf.parent_generation = inode->i_generation;
|
|
*lenp = 5;
|
|
type = FILEID_UDF_WITH_PARENT;
|
|
}
|
|
|
|
return type;
|
|
}
|
|
|
|
const struct export_operations udf_export_ops = {
|
|
.encode_fh = udf_encode_fh,
|
|
.fh_to_dentry = udf_fh_to_dentry,
|
|
.fh_to_parent = udf_fh_to_parent,
|
|
.get_parent = udf_get_parent,
|
|
};
|
|
|
|
const struct inode_operations udf_dir_inode_operations = {
|
|
.lookup = udf_lookup,
|
|
.create = udf_create,
|
|
.link = udf_link,
|
|
.unlink = udf_unlink,
|
|
.symlink = udf_symlink,
|
|
.mkdir = udf_mkdir,
|
|
.rmdir = udf_rmdir,
|
|
.mknod = udf_mknod,
|
|
.rename = udf_rename,
|
|
.tmpfile = udf_tmpfile,
|
|
};
|