mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 11:06:40 +07:00
1a67aafb5f
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1336 lines
34 KiB
C
1336 lines
34 KiB
C
/*
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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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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*
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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/buffer_head.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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enum { UDF_MAX_LINKS = 0xffff };
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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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int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
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struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
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uint8_t *impuse, uint8_t *fileident)
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{
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uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
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uint16_t crc;
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int offset;
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uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
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uint8_t lfi = cfi->lengthFileIdent;
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int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
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sizeof(struct fileIdentDesc);
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int adinicb = 0;
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if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
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adinicb = 1;
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offset = fibh->soffset + sizeof(struct fileIdentDesc);
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if (impuse) {
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if (adinicb || (offset + liu < 0)) {
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memcpy((uint8_t *)sfi->impUse, impuse, liu);
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} else if (offset >= 0) {
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memcpy(fibh->ebh->b_data + offset, impuse, liu);
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} else {
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memcpy((uint8_t *)sfi->impUse, impuse, -offset);
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memcpy(fibh->ebh->b_data, impuse - offset,
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liu + offset);
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}
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}
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offset += liu;
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if (fileident) {
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if (adinicb || (offset + lfi < 0)) {
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memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
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} else if (offset >= 0) {
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memcpy(fibh->ebh->b_data + offset, fileident, lfi);
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} else {
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memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
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-offset);
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memcpy(fibh->ebh->b_data, fileident - offset,
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lfi + offset);
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}
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}
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offset += lfi;
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if (adinicb || (offset + padlen < 0)) {
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memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
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} else if (offset >= 0) {
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memset(fibh->ebh->b_data + offset, 0x00, padlen);
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} else {
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memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
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memset(fibh->ebh->b_data, 0x00, padlen + offset);
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}
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crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
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sizeof(struct fileIdentDesc) - sizeof(struct tag));
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if (fibh->sbh == fibh->ebh) {
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crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
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crclen + sizeof(struct tag) -
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sizeof(struct fileIdentDesc));
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} else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
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crc = crc_itu_t(crc, fibh->ebh->b_data +
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sizeof(struct fileIdentDesc) +
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fibh->soffset,
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crclen + sizeof(struct tag) -
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sizeof(struct fileIdentDesc));
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} else {
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crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
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-fibh->soffset - sizeof(struct fileIdentDesc));
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crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
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}
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cfi->descTag.descCRC = cpu_to_le16(crc);
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cfi->descTag.descCRCLength = cpu_to_le16(crclen);
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cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
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if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
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memcpy((uint8_t *)sfi, (uint8_t *)cfi,
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sizeof(struct fileIdentDesc));
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} else {
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memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
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memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
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sizeof(struct fileIdentDesc) + fibh->soffset);
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}
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if (adinicb) {
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mark_inode_dirty(inode);
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} else {
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if (fibh->sbh != fibh->ebh)
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mark_buffer_dirty_inode(fibh->ebh, inode);
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mark_buffer_dirty_inode(fibh->sbh, inode);
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}
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return 0;
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}
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static struct fileIdentDesc *udf_find_entry(struct inode *dir,
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const struct qstr *child,
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struct udf_fileident_bh *fibh,
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struct fileIdentDesc *cfi)
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{
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struct fileIdentDesc *fi = NULL;
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loff_t f_pos;
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int block, flen;
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unsigned char *fname = NULL;
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unsigned char *nameptr;
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uint8_t lfi;
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uint16_t liu;
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loff_t size;
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struct kernel_lb_addr eloc;
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uint32_t elen;
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sector_t offset;
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struct extent_position epos = {};
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struct udf_inode_info *dinfo = UDF_I(dir);
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int isdotdot = child->len == 2 &&
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child->name[0] == '.' && child->name[1] == '.';
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size = udf_ext0_offset(dir) + dir->i_size;
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f_pos = udf_ext0_offset(dir);
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fibh->sbh = fibh->ebh = NULL;
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fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
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if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
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if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
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&eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
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goto out_err;
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block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
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if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
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epos.offset -= sizeof(struct short_ad);
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else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
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epos.offset -= sizeof(struct long_ad);
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} else
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offset = 0;
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fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
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if (!fibh->sbh)
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goto out_err;
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}
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fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
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if (!fname)
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goto out_err;
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while (f_pos < size) {
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fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
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&elen, &offset);
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if (!fi)
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goto out_err;
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liu = le16_to_cpu(cfi->lengthOfImpUse);
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lfi = cfi->lengthFileIdent;
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if (fibh->sbh == fibh->ebh) {
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nameptr = fi->fileIdent + liu;
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} else {
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int poffset; /* Unpaded ending offset */
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poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
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liu + lfi;
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if (poffset >= lfi)
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nameptr = (uint8_t *)(fibh->ebh->b_data +
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poffset - lfi);
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else {
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nameptr = fname;
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memcpy(nameptr, fi->fileIdent + liu,
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lfi - poffset);
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memcpy(nameptr + lfi - poffset,
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fibh->ebh->b_data, poffset);
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}
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}
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if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
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if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
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continue;
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}
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if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
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if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
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continue;
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}
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if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
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isdotdot)
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goto out_ok;
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if (!lfi)
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continue;
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flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
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if (flen && udf_match(flen, fname, child->len, child->name))
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goto out_ok;
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}
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out_err:
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fi = NULL;
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if (fibh->sbh != fibh->ebh)
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brelse(fibh->ebh);
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brelse(fibh->sbh);
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out_ok:
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brelse(epos.bh);
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kfree(fname);
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return fi;
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}
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static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
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struct nameidata *nd)
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{
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struct inode *inode = NULL;
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struct fileIdentDesc cfi;
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struct udf_fileident_bh fibh;
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if (dentry->d_name.len > UDF_NAME_LEN - 2)
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return ERR_PTR(-ENAMETOOLONG);
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#ifdef UDF_RECOVERY
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/* temporary shorthand for specifying files by inode number */
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if (!strncmp(dentry->d_name.name, ".B=", 3)) {
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struct kernel_lb_addr lb = {
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.logicalBlockNum = 0,
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.partitionReferenceNum =
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simple_strtoul(dentry->d_name.name + 3,
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NULL, 0),
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};
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inode = udf_iget(dir->i_sb, lb);
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if (!inode) {
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return ERR_PTR(-EACCES);
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}
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} else
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#endif /* UDF_RECOVERY */
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if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
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struct kernel_lb_addr loc;
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if (fibh.sbh != fibh.ebh)
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brelse(fibh.ebh);
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brelse(fibh.sbh);
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loc = lelb_to_cpu(cfi.icb.extLocation);
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inode = udf_iget(dir->i_sb, &loc);
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if (!inode) {
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return ERR_PTR(-EACCES);
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}
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}
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return d_splice_alias(inode, dentry);
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}
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static struct fileIdentDesc *udf_add_entry(struct inode *dir,
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struct dentry *dentry,
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struct udf_fileident_bh *fibh,
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struct fileIdentDesc *cfi, int *err)
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{
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struct super_block *sb = dir->i_sb;
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struct fileIdentDesc *fi = NULL;
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unsigned char *name = NULL;
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int namelen;
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loff_t f_pos;
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loff_t size = udf_ext0_offset(dir) + dir->i_size;
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int nfidlen;
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uint8_t lfi;
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uint16_t liu;
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int block;
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struct kernel_lb_addr eloc;
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uint32_t elen = 0;
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sector_t offset;
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struct extent_position epos = {};
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struct udf_inode_info *dinfo;
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fibh->sbh = fibh->ebh = NULL;
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name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
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if (!name) {
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*err = -ENOMEM;
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goto out_err;
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}
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if (dentry) {
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if (!dentry->d_name.len) {
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*err = -EINVAL;
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goto out_err;
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}
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namelen = udf_put_filename(sb, dentry->d_name.name, name,
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dentry->d_name.len);
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if (!namelen) {
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*err = -ENAMETOOLONG;
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goto out_err;
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}
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} else {
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namelen = 0;
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}
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nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
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f_pos = udf_ext0_offset(dir);
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fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
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dinfo = UDF_I(dir);
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if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
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if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
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&eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
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block = udf_get_lb_pblock(dir->i_sb,
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&dinfo->i_location, 0);
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fibh->soffset = fibh->eoffset = sb->s_blocksize;
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goto add;
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}
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block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
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if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
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epos.offset -= sizeof(struct short_ad);
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else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
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epos.offset -= sizeof(struct long_ad);
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} else
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offset = 0;
|
|
|
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fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
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if (!fibh->sbh) {
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*err = -EIO;
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goto out_err;
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}
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|
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block = dinfo->i_location.logicalBlockNum;
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}
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|
|
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while (f_pos < size) {
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fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
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&elen, &offset);
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|
|
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if (!fi) {
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*err = -EIO;
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goto out_err;
|
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}
|
|
|
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liu = le16_to_cpu(cfi->lengthOfImpUse);
|
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lfi = cfi->lengthFileIdent;
|
|
|
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if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
|
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if (((sizeof(struct fileIdentDesc) +
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liu + lfi + 3) & ~3) == nfidlen) {
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cfi->descTag.tagSerialNum = cpu_to_le16(1);
|
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cfi->fileVersionNum = cpu_to_le16(1);
|
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cfi->fileCharacteristics = 0;
|
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cfi->lengthFileIdent = namelen;
|
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cfi->lengthOfImpUse = cpu_to_le16(0);
|
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if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
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name))
|
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goto out_ok;
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else {
|
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*err = -EIO;
|
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goto out_err;
|
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}
|
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}
|
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}
|
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}
|
|
|
|
add:
|
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f_pos += nfidlen;
|
|
|
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
|
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sb->s_blocksize - fibh->eoffset < nfidlen) {
|
|
brelse(epos.bh);
|
|
epos.bh = NULL;
|
|
fibh->soffset -= udf_ext0_offset(dir);
|
|
fibh->eoffset -= udf_ext0_offset(dir);
|
|
f_pos -= udf_ext0_offset(dir);
|
|
if (fibh->sbh != fibh->ebh)
|
|
brelse(fibh->ebh);
|
|
brelse(fibh->sbh);
|
|
fibh->sbh = fibh->ebh =
|
|
udf_expand_dir_adinicb(dir, &block, err);
|
|
if (!fibh->sbh)
|
|
goto out_err;
|
|
epos.block = dinfo->i_location;
|
|
epos.offset = udf_file_entry_alloc_offset(dir);
|
|
/* Load extent udf_expand_dir_adinicb() has created */
|
|
udf_current_aext(dir, &epos, &eloc, &elen, 1);
|
|
}
|
|
|
|
/* Entry fits into current block? */
|
|
if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
|
|
fibh->soffset = fibh->eoffset;
|
|
fibh->eoffset += nfidlen;
|
|
if (fibh->sbh != fibh->ebh) {
|
|
brelse(fibh->sbh);
|
|
fibh->sbh = fibh->ebh;
|
|
}
|
|
|
|
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
|
|
block = dinfo->i_location.logicalBlockNum;
|
|
fi = (struct fileIdentDesc *)
|
|
(dinfo->i_ext.i_data +
|
|
fibh->soffset -
|
|
udf_ext0_offset(dir) +
|
|
dinfo->i_lenEAttr);
|
|
} else {
|
|
block = eloc.logicalBlockNum +
|
|
((elen - 1) >>
|
|
dir->i_sb->s_blocksize_bits);
|
|
fi = (struct fileIdentDesc *)
|
|
(fibh->sbh->b_data + fibh->soffset);
|
|
}
|
|
} else {
|
|
/* Round up last extent in the file */
|
|
elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
|
|
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
|
|
epos.offset -= sizeof(struct short_ad);
|
|
else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
|
|
epos.offset -= sizeof(struct long_ad);
|
|
udf_write_aext(dir, &epos, &eloc, elen, 1);
|
|
dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
|
|
- 1) & ~(sb->s_blocksize - 1);
|
|
|
|
fibh->soffset = fibh->eoffset - sb->s_blocksize;
|
|
fibh->eoffset += nfidlen - sb->s_blocksize;
|
|
if (fibh->sbh != fibh->ebh) {
|
|
brelse(fibh->sbh);
|
|
fibh->sbh = fibh->ebh;
|
|
}
|
|
|
|
block = eloc.logicalBlockNum + ((elen - 1) >>
|
|
dir->i_sb->s_blocksize_bits);
|
|
fibh->ebh = udf_bread(dir,
|
|
f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
|
|
if (!fibh->ebh)
|
|
goto out_err;
|
|
/* Extents could have been merged, invalidate our position */
|
|
brelse(epos.bh);
|
|
epos.bh = NULL;
|
|
epos.block = dinfo->i_location;
|
|
epos.offset = udf_file_entry_alloc_offset(dir);
|
|
|
|
if (!fibh->soffset) {
|
|
/* Find the freshly allocated block */
|
|
while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
|
|
(EXT_RECORDED_ALLOCATED >> 30))
|
|
;
|
|
block = eloc.logicalBlockNum + ((elen - 1) >>
|
|
dir->i_sb->s_blocksize_bits);
|
|
brelse(fibh->sbh);
|
|
fibh->sbh = fibh->ebh;
|
|
fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
|
|
} else {
|
|
fi = (struct fileIdentDesc *)
|
|
(fibh->sbh->b_data + sb->s_blocksize +
|
|
fibh->soffset);
|
|
}
|
|
}
|
|
|
|
memset(cfi, 0, sizeof(struct fileIdentDesc));
|
|
if (UDF_SB(sb)->s_udfrev >= 0x0200)
|
|
udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
|
|
sizeof(struct tag));
|
|
else
|
|
udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
|
|
sizeof(struct tag));
|
|
cfi->fileVersionNum = cpu_to_le16(1);
|
|
cfi->lengthFileIdent = namelen;
|
|
cfi->lengthOfImpUse = cpu_to_le16(0);
|
|
if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
|
|
dir->i_size += nfidlen;
|
|
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
|
|
dinfo->i_lenAlloc += nfidlen;
|
|
else {
|
|
/* Find the last extent and truncate it to proper size */
|
|
while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
|
|
(EXT_RECORDED_ALLOCATED >> 30))
|
|
;
|
|
elen -= dinfo->i_lenExtents - dir->i_size;
|
|
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
|
|
epos.offset -= sizeof(struct short_ad);
|
|
else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
|
|
epos.offset -= sizeof(struct long_ad);
|
|
udf_write_aext(dir, &epos, &eloc, elen, 1);
|
|
dinfo->i_lenExtents = dir->i_size;
|
|
}
|
|
|
|
mark_inode_dirty(dir);
|
|
goto out_ok;
|
|
} else {
|
|
*err = -EIO;
|
|
goto out_err;
|
|
}
|
|
|
|
out_err:
|
|
fi = NULL;
|
|
if (fibh->sbh != fibh->ebh)
|
|
brelse(fibh->ebh);
|
|
brelse(fibh->sbh);
|
|
out_ok:
|
|
brelse(epos.bh);
|
|
kfree(name);
|
|
return fi;
|
|
}
|
|
|
|
static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
|
|
struct udf_fileident_bh *fibh,
|
|
struct fileIdentDesc *cfi)
|
|
{
|
|
cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
|
|
|
|
if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
|
|
memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
|
|
|
|
return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
|
|
}
|
|
|
|
static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
|
|
struct nameidata *nd)
|
|
{
|
|
struct udf_fileident_bh fibh;
|
|
struct inode *inode;
|
|
struct fileIdentDesc cfi, *fi;
|
|
int err;
|
|
struct udf_inode_info *iinfo;
|
|
|
|
inode = udf_new_inode(dir, mode, &err);
|
|
if (!inode) {
|
|
return err;
|
|
}
|
|
|
|
iinfo = UDF_I(inode);
|
|
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
|
|
inode->i_data.a_ops = &udf_adinicb_aops;
|
|
else
|
|
inode->i_data.a_ops = &udf_aops;
|
|
inode->i_op = &udf_file_inode_operations;
|
|
inode->i_fop = &udf_file_operations;
|
|
mark_inode_dirty(inode);
|
|
|
|
fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
|
|
if (!fi) {
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
|
|
cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
|
|
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
|
|
cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
|
|
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
|
|
if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
|
|
mark_inode_dirty(dir);
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
d_instantiate(dentry, inode);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
|
|
dev_t rdev)
|
|
{
|
|
struct inode *inode;
|
|
struct udf_fileident_bh fibh;
|
|
struct fileIdentDesc cfi, *fi;
|
|
int err;
|
|
struct udf_inode_info *iinfo;
|
|
|
|
if (!old_valid_dev(rdev))
|
|
return -EINVAL;
|
|
|
|
err = -EIO;
|
|
inode = udf_new_inode(dir, mode, &err);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
iinfo = UDF_I(inode);
|
|
init_special_inode(inode, mode, rdev);
|
|
fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
|
|
if (!fi) {
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
|
|
cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
|
|
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
|
|
cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
|
|
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
|
|
if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
|
|
mark_inode_dirty(dir);
|
|
mark_inode_dirty(inode);
|
|
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
d_instantiate(dentry, inode);
|
|
err = 0;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct inode *inode;
|
|
struct udf_fileident_bh fibh;
|
|
struct fileIdentDesc cfi, *fi;
|
|
int err;
|
|
struct udf_inode_info *dinfo = UDF_I(dir);
|
|
struct udf_inode_info *iinfo;
|
|
|
|
err = -EMLINK;
|
|
if (dir->i_nlink >= UDF_MAX_LINKS)
|
|
goto out;
|
|
|
|
err = -EIO;
|
|
inode = udf_new_inode(dir, S_IFDIR | mode, &err);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
iinfo = UDF_I(inode);
|
|
inode->i_op = &udf_dir_inode_operations;
|
|
inode->i_fop = &udf_dir_operations;
|
|
fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
|
|
if (!fi) {
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
goto out;
|
|
}
|
|
set_nlink(inode, 2);
|
|
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
|
|
cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
|
|
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
|
|
cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
|
|
cfi.fileCharacteristics =
|
|
FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
|
|
udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
|
|
brelse(fibh.sbh);
|
|
mark_inode_dirty(inode);
|
|
|
|
fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
|
|
if (!fi) {
|
|
clear_nlink(inode);
|
|
mark_inode_dirty(inode);
|
|
iput(inode);
|
|
goto out;
|
|
}
|
|
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
|
|
cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
|
|
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
|
|
cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
|
|
cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
|
|
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
|
|
inc_nlink(dir);
|
|
mark_inode_dirty(dir);
|
|
d_instantiate(dentry, inode);
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
err = 0;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int empty_dir(struct inode *dir)
|
|
{
|
|
struct fileIdentDesc *fi, cfi;
|
|
struct udf_fileident_bh fibh;
|
|
loff_t f_pos;
|
|
loff_t size = udf_ext0_offset(dir) + dir->i_size;
|
|
int block;
|
|
struct kernel_lb_addr eloc;
|
|
uint32_t elen;
|
|
sector_t offset;
|
|
struct extent_position epos = {};
|
|
struct udf_inode_info *dinfo = UDF_I(dir);
|
|
|
|
f_pos = udf_ext0_offset(dir);
|
|
fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
|
|
|
|
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
|
|
fibh.sbh = fibh.ebh = NULL;
|
|
else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
|
|
&epos, &eloc, &elen, &offset) ==
|
|
(EXT_RECORDED_ALLOCATED >> 30)) {
|
|
block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
|
|
if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
|
|
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
|
|
epos.offset -= sizeof(struct short_ad);
|
|
else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
|
|
epos.offset -= sizeof(struct long_ad);
|
|
} else
|
|
offset = 0;
|
|
|
|
fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
|
|
if (!fibh.sbh) {
|
|
brelse(epos.bh);
|
|
return 0;
|
|
}
|
|
} else {
|
|
brelse(epos.bh);
|
|
return 0;
|
|
}
|
|
|
|
while (f_pos < size) {
|
|
fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
|
|
&elen, &offset);
|
|
if (!fi) {
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
brelse(epos.bh);
|
|
return 0;
|
|
}
|
|
|
|
if (cfi.lengthFileIdent &&
|
|
(cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
brelse(epos.bh);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
brelse(epos.bh);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int udf_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int retval;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct udf_fileident_bh fibh;
|
|
struct fileIdentDesc *fi, cfi;
|
|
struct kernel_lb_addr tloc;
|
|
|
|
retval = -ENOENT;
|
|
fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
|
|
if (!fi)
|
|
goto out;
|
|
|
|
retval = -EIO;
|
|
tloc = lelb_to_cpu(cfi.icb.extLocation);
|
|
if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
|
|
goto end_rmdir;
|
|
retval = -ENOTEMPTY;
|
|
if (!empty_dir(inode))
|
|
goto end_rmdir;
|
|
retval = udf_delete_entry(dir, fi, &fibh, &cfi);
|
|
if (retval)
|
|
goto end_rmdir;
|
|
if (inode->i_nlink != 2)
|
|
udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
|
|
inode->i_nlink);
|
|
clear_nlink(inode);
|
|
inode->i_size = 0;
|
|
inode_dec_link_count(dir);
|
|
inode->i_ctime = dir->i_ctime = dir->i_mtime =
|
|
current_fs_time(dir->i_sb);
|
|
mark_inode_dirty(dir);
|
|
|
|
end_rmdir:
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static int udf_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int retval;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct udf_fileident_bh fibh;
|
|
struct fileIdentDesc *fi;
|
|
struct fileIdentDesc cfi;
|
|
struct kernel_lb_addr tloc;
|
|
|
|
retval = -ENOENT;
|
|
fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
|
|
if (!fi)
|
|
goto out;
|
|
|
|
retval = -EIO;
|
|
tloc = lelb_to_cpu(cfi.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), %d\n",
|
|
inode->i_ino, inode->i_nlink);
|
|
set_nlink(inode, 1);
|
|
}
|
|
retval = udf_delete_entry(dir, fi, &fibh, &cfi);
|
|
if (retval)
|
|
goto end_unlink;
|
|
dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
|
|
mark_inode_dirty(dir);
|
|
inode_dec_link_count(inode);
|
|
inode->i_ctime = dir->i_ctime;
|
|
retval = 0;
|
|
|
|
end_unlink:
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static int udf_symlink(struct inode *dir, struct dentry *dentry,
|
|
const char *symname)
|
|
{
|
|
struct inode *inode;
|
|
struct pathComponent *pc;
|
|
const char *compstart;
|
|
struct udf_fileident_bh fibh;
|
|
struct extent_position epos = {};
|
|
int eoffset, elen = 0;
|
|
struct fileIdentDesc *fi;
|
|
struct fileIdentDesc cfi;
|
|
uint8_t *ea;
|
|
int err;
|
|
int block;
|
|
unsigned char *name = NULL;
|
|
int namelen;
|
|
struct udf_inode_info *iinfo;
|
|
struct super_block *sb = dir->i_sb;
|
|
|
|
inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
iinfo = UDF_I(inode);
|
|
down_write(&iinfo->i_data_sem);
|
|
name = kmalloc(UDF_NAME_LEN, 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;
|
|
|
|
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;
|
|
udf_add_aext(inode, &epos, &eloc, bsize, 0);
|
|
brelse(epos.bh);
|
|
|
|
block = udf_get_pblock(sb, block,
|
|
iinfo->i_location.partitionReferenceNum,
|
|
0);
|
|
epos.bh = udf_tgetblk(sb, block);
|
|
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_ext.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, name,
|
|
symname - compstart);
|
|
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);
|
|
|
|
fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
|
|
if (!fi)
|
|
goto out_no_entry;
|
|
cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
|
|
cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
|
|
if (UDF_SB(inode->i_sb)->s_lvid_bh) {
|
|
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
|
|
cpu_to_le32(lvid_get_unique_id(sb));
|
|
}
|
|
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
|
|
if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
|
|
mark_inode_dirty(dir);
|
|
up_write(&iinfo->i_data_sem);
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
d_instantiate(dentry, inode);
|
|
err = 0;
|
|
|
|
out:
|
|
kfree(name);
|
|
return err;
|
|
|
|
out_no_entry:
|
|
up_write(&iinfo->i_data_sem);
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
goto out;
|
|
}
|
|
|
|
static int udf_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct inode *inode = old_dentry->d_inode;
|
|
struct udf_fileident_bh fibh;
|
|
struct fileIdentDesc cfi, *fi;
|
|
int err;
|
|
|
|
if (inode->i_nlink >= UDF_MAX_LINKS)
|
|
return -EMLINK;
|
|
|
|
fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
|
|
if (!fi) {
|
|
return err;
|
|
}
|
|
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
|
|
cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
|
|
if (UDF_SB(inode->i_sb)->s_lvid_bh) {
|
|
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
|
|
cpu_to_le32(lvid_get_unique_id(inode->i_sb));
|
|
}
|
|
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
|
|
if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
|
|
mark_inode_dirty(dir);
|
|
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
inc_nlink(inode);
|
|
inode->i_ctime = current_fs_time(inode->i_sb);
|
|
mark_inode_dirty(inode);
|
|
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 inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
struct inode *old_inode = old_dentry->d_inode;
|
|
struct inode *new_inode = new_dentry->d_inode;
|
|
struct udf_fileident_bh ofibh, nfibh;
|
|
struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
|
|
struct fileIdentDesc ocfi, ncfi;
|
|
struct buffer_head *dir_bh = NULL;
|
|
int retval = -ENOENT;
|
|
struct kernel_lb_addr tloc;
|
|
struct udf_inode_info *old_iinfo = UDF_I(old_inode);
|
|
|
|
ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
|
|
if (ofi) {
|
|
if (ofibh.sbh != ofibh.ebh)
|
|
brelse(ofibh.ebh);
|
|
brelse(ofibh.sbh);
|
|
}
|
|
tloc = lelb_to_cpu(ocfi.icb.extLocation);
|
|
if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
|
|
!= old_inode->i_ino)
|
|
goto end_rename;
|
|
|
|
nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
|
|
if (nfi) {
|
|
if (!new_inode) {
|
|
if (nfibh.sbh != nfibh.ebh)
|
|
brelse(nfibh.ebh);
|
|
brelse(nfibh.sbh);
|
|
nfi = NULL;
|
|
}
|
|
}
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
int offset = udf_ext0_offset(old_inode);
|
|
|
|
if (new_inode) {
|
|
retval = -ENOTEMPTY;
|
|
if (!empty_dir(new_inode))
|
|
goto end_rename;
|
|
}
|
|
retval = -EIO;
|
|
if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
|
|
dir_fi = udf_get_fileident(
|
|
old_iinfo->i_ext.i_data -
|
|
(old_iinfo->i_efe ?
|
|
sizeof(struct extendedFileEntry) :
|
|
sizeof(struct fileEntry)),
|
|
old_inode->i_sb->s_blocksize, &offset);
|
|
} else {
|
|
dir_bh = udf_bread(old_inode, 0, 0, &retval);
|
|
if (!dir_bh)
|
|
goto end_rename;
|
|
dir_fi = udf_get_fileident(dir_bh->b_data,
|
|
old_inode->i_sb->s_blocksize, &offset);
|
|
}
|
|
if (!dir_fi)
|
|
goto end_rename;
|
|
tloc = lelb_to_cpu(dir_fi->icb.extLocation);
|
|
if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
|
|
old_dir->i_ino)
|
|
goto end_rename;
|
|
|
|
retval = -EMLINK;
|
|
if (!new_inode && new_dir->i_nlink >= UDF_MAX_LINKS)
|
|
goto end_rename;
|
|
}
|
|
if (!nfi) {
|
|
nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
|
|
&retval);
|
|
if (!nfi)
|
|
goto end_rename;
|
|
}
|
|
|
|
/*
|
|
* Like most other Unix systems, set the ctime for inodes on a
|
|
* rename.
|
|
*/
|
|
old_inode->i_ctime = current_fs_time(old_inode->i_sb);
|
|
mark_inode_dirty(old_inode);
|
|
|
|
/*
|
|
* ok, that's it
|
|
*/
|
|
ncfi.fileVersionNum = ocfi.fileVersionNum;
|
|
ncfi.fileCharacteristics = ocfi.fileCharacteristics;
|
|
memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
|
|
udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
|
|
|
|
/* The old fid may have moved - find it again */
|
|
ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
|
|
udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
|
|
|
|
if (new_inode) {
|
|
new_inode->i_ctime = current_fs_time(new_inode->i_sb);
|
|
inode_dec_link_count(new_inode);
|
|
}
|
|
old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
|
|
mark_inode_dirty(old_dir);
|
|
|
|
if (dir_fi) {
|
|
dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
|
|
udf_update_tag((char *)dir_fi,
|
|
(sizeof(struct fileIdentDesc) +
|
|
le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
|
|
if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
|
|
mark_inode_dirty(old_inode);
|
|
else
|
|
mark_buffer_dirty_inode(dir_bh, old_inode);
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
if (ofi) {
|
|
if (ofibh.sbh != ofibh.ebh)
|
|
brelse(ofibh.ebh);
|
|
brelse(ofibh.sbh);
|
|
}
|
|
|
|
retval = 0;
|
|
|
|
end_rename:
|
|
brelse(dir_bh);
|
|
if (nfi) {
|
|
if (nfibh.sbh != nfibh.ebh)
|
|
brelse(nfibh.ebh);
|
|
brelse(nfibh.sbh);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static struct dentry *udf_get_parent(struct dentry *child)
|
|
{
|
|
struct kernel_lb_addr tloc;
|
|
struct inode *inode = NULL;
|
|
struct qstr dotdot = {.name = "..", .len = 2};
|
|
struct fileIdentDesc cfi;
|
|
struct udf_fileident_bh fibh;
|
|
|
|
if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
|
|
goto out_unlock;
|
|
|
|
if (fibh.sbh != fibh.ebh)
|
|
brelse(fibh.ebh);
|
|
brelse(fibh.sbh);
|
|
|
|
tloc = lelb_to_cpu(cfi.icb.extLocation);
|
|
inode = udf_iget(child->d_inode->i_sb, &tloc);
|
|
if (!inode)
|
|
goto out_unlock;
|
|
|
|
return d_obtain_alias(inode);
|
|
out_unlock:
|
|
return ERR_PTR(-EACCES);
|
|
}
|
|
|
|
|
|
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 (inode == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
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_len != 5) ||
|
|
(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 dentry *de, __u32 *fh, int *lenp,
|
|
int connectable)
|
|
{
|
|
int len = *lenp;
|
|
struct inode *inode = de->d_inode;
|
|
struct kernel_lb_addr location = UDF_I(inode)->i_location;
|
|
struct fid *fid = (struct fid *)fh;
|
|
int type = FILEID_UDF_WITHOUT_PARENT;
|
|
|
|
if (connectable && (len < 5)) {
|
|
*lenp = 5;
|
|
return 255;
|
|
} else if (len < 3) {
|
|
*lenp = 3;
|
|
return 255;
|
|
}
|
|
|
|
*lenp = 3;
|
|
fid->udf.block = location.logicalBlockNum;
|
|
fid->udf.partref = location.partitionReferenceNum;
|
|
fid->udf.generation = inode->i_generation;
|
|
|
|
if (connectable && !S_ISDIR(inode->i_mode)) {
|
|
spin_lock(&de->d_lock);
|
|
inode = de->d_parent->d_inode;
|
|
location = UDF_I(inode)->i_location;
|
|
fid->udf.parent_block = location.logicalBlockNum;
|
|
fid->udf.parent_partref = location.partitionReferenceNum;
|
|
fid->udf.parent_generation = inode->i_generation;
|
|
spin_unlock(&de->d_lock);
|
|
*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,
|
|
};
|
|
const struct inode_operations udf_symlink_inode_operations = {
|
|
.readlink = generic_readlink,
|
|
.follow_link = page_follow_link_light,
|
|
.put_link = page_put_link,
|
|
};
|