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-rw-r--r--fs/udf/namei.c1017
1 files changed, 1017 insertions, 0 deletions
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
new file mode 100644
index 0000000000..ae55ab8859
--- /dev/null
+++ b/fs/udf/namei.c
@@ -0,0 +1,1017 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * namei.c
+ *
+ * PURPOSE
+ * Inode name handling routines for the OSTA-UDF(tm) filesystem.
+ *
+ * COPYRIGHT
+ * (C) 1998-2004 Ben Fennema
+ * (C) 1999-2000 Stelias Computing Inc
+ *
+ * HISTORY
+ *
+ * 12/12/98 blf Created. Split out the lookup code from dir.c
+ * 04/19/99 blf link, mknod, symlink support
+ */
+
+#include "udfdecl.h"
+
+#include "udf_i.h"
+#include "udf_sb.h"
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/crc-itu-t.h>
+#include <linux/exportfs.h>
+#include <linux/iversion.h>
+
+static inline int udf_match(int len1, const unsigned char *name1, int len2,
+ const unsigned char *name2)
+{
+ if (len1 != len2)
+ return 0;
+
+ return !memcmp(name1, name2, len1);
+}
+
+/**
+ * udf_fiiter_find_entry - find entry in given directory.
+ *
+ * @dir: directory inode to search in
+ * @child: qstr of the name
+ * @iter: iter to use for searching
+ *
+ * This function searches in the directory @dir for a file name @child. When
+ * found, @iter points to the position in the directory with given entry.
+ *
+ * Returns 0 on success, < 0 on error (including -ENOENT).
+ */
+static int udf_fiiter_find_entry(struct inode *dir, const struct qstr *child,
+ struct udf_fileident_iter *iter)
+{
+ int flen;
+ unsigned char *fname = NULL;
+ struct super_block *sb = dir->i_sb;
+ int isdotdot = child->len == 2 &&
+ child->name[0] == '.' && child->name[1] == '.';
+ int ret;
+
+ fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
+ if (!fname)
+ return -ENOMEM;
+
+ for (ret = udf_fiiter_init(iter, dir, 0);
+ !ret && iter->pos < dir->i_size;
+ ret = udf_fiiter_advance(iter)) {
+ if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
+ if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
+ continue;
+ }
+
+ if (iter->fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) {
+ if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
+ continue;
+ }
+
+ if ((iter->fi.fileCharacteristics & FID_FILE_CHAR_PARENT) &&
+ isdotdot)
+ goto out_ok;
+
+ if (!iter->fi.lengthFileIdent)
+ continue;
+
+ flen = udf_get_filename(sb, iter->name,
+ iter->fi.lengthFileIdent, fname, UDF_NAME_LEN);
+ if (flen < 0) {
+ ret = flen;
+ goto out_err;
+ }
+
+ if (udf_match(flen, fname, child->len, child->name))
+ goto out_ok;
+ }
+ if (!ret)
+ ret = -ENOENT;
+
+out_err:
+ udf_fiiter_release(iter);
+out_ok:
+ kfree(fname);
+
+ return ret;
+}
+
+static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
+ unsigned int flags)
+{
+ struct inode *inode = NULL;
+ struct udf_fileident_iter iter;
+ int err;
+
+ if (dentry->d_name.len > UDF_NAME_LEN)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ err = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
+ if (err < 0 && err != -ENOENT)
+ return ERR_PTR(err);
+
+ if (err == 0) {
+ struct kernel_lb_addr loc;
+
+ loc = lelb_to_cpu(iter.fi.icb.extLocation);
+ udf_fiiter_release(&iter);
+
+ inode = udf_iget(dir->i_sb, &loc);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ }
+
+ return d_splice_alias(inode, dentry);
+}
+
+static int udf_expand_dir_adinicb(struct inode *inode, udf_pblk_t *block)
+{
+ udf_pblk_t newblock;
+ struct buffer_head *dbh = NULL;
+ struct kernel_lb_addr eloc;
+ struct extent_position epos;
+ uint8_t alloctype;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ struct udf_fileident_iter iter;
+ uint8_t *impuse;
+ int ret;
+
+ if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
+ alloctype = ICBTAG_FLAG_AD_SHORT;
+ else
+ alloctype = ICBTAG_FLAG_AD_LONG;
+
+ if (!inode->i_size) {
+ iinfo->i_alloc_type = alloctype;
+ mark_inode_dirty(inode);
+ return 0;
+ }
+
+ /* alloc block, and copy data to it */
+ *block = udf_new_block(inode->i_sb, inode,
+ iinfo->i_location.partitionReferenceNum,
+ iinfo->i_location.logicalBlockNum, &ret);
+ if (!(*block))
+ return ret;
+ newblock = udf_get_pblock(inode->i_sb, *block,
+ iinfo->i_location.partitionReferenceNum,
+ 0);
+ if (newblock == 0xffffffff)
+ return -EFSCORRUPTED;
+ dbh = sb_getblk(inode->i_sb, newblock);
+ if (!dbh)
+ return -ENOMEM;
+ lock_buffer(dbh);
+ memcpy(dbh->b_data, iinfo->i_data, inode->i_size);
+ memset(dbh->b_data + inode->i_size, 0,
+ inode->i_sb->s_blocksize - inode->i_size);
+ set_buffer_uptodate(dbh);
+ unlock_buffer(dbh);
+
+ /* Drop inline data, add block instead */
+ iinfo->i_alloc_type = alloctype;
+ memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc);
+ iinfo->i_lenAlloc = 0;
+ eloc.logicalBlockNum = *block;
+ eloc.partitionReferenceNum =
+ iinfo->i_location.partitionReferenceNum;
+ iinfo->i_lenExtents = inode->i_size;
+ epos.bh = NULL;
+ epos.block = iinfo->i_location;
+ epos.offset = udf_file_entry_alloc_offset(inode);
+ ret = udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
+ brelse(epos.bh);
+ if (ret < 0) {
+ brelse(dbh);
+ udf_free_blocks(inode->i_sb, inode, &eloc, 0, 1);
+ return ret;
+ }
+ mark_inode_dirty(inode);
+
+ /* Now fixup tags in moved directory entries */
+ for (ret = udf_fiiter_init(&iter, inode, 0);
+ !ret && iter.pos < inode->i_size;
+ ret = udf_fiiter_advance(&iter)) {
+ iter.fi.descTag.tagLocation = cpu_to_le32(*block);
+ if (iter.fi.lengthOfImpUse != cpu_to_le16(0))
+ impuse = dbh->b_data + iter.pos +
+ sizeof(struct fileIdentDesc);
+ else
+ impuse = NULL;
+ udf_fiiter_write_fi(&iter, impuse);
+ }
+ brelse(dbh);
+ /*
+ * We don't expect the iteration to fail as the directory has been
+ * already verified to be correct
+ */
+ WARN_ON_ONCE(ret);
+ udf_fiiter_release(&iter);
+
+ return 0;
+}
+
+static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry,
+ struct udf_fileident_iter *iter)
+{
+ struct udf_inode_info *dinfo = UDF_I(dir);
+ int nfidlen, namelen = 0;
+ int ret;
+ int off, blksize = 1 << dir->i_blkbits;
+ udf_pblk_t block;
+ char name[UDF_NAME_LEN_CS0];
+
+ if (dentry) {
+ if (!dentry->d_name.len)
+ return -EINVAL;
+ namelen = udf_put_filename(dir->i_sb, dentry->d_name.name,
+ dentry->d_name.len,
+ name, UDF_NAME_LEN_CS0);
+ if (!namelen)
+ return -ENAMETOOLONG;
+ }
+ nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
+
+ for (ret = udf_fiiter_init(iter, dir, 0);
+ !ret && iter->pos < dir->i_size;
+ ret = udf_fiiter_advance(iter)) {
+ if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
+ if (udf_dir_entry_len(&iter->fi) == nfidlen) {
+ iter->fi.descTag.tagSerialNum = cpu_to_le16(1);
+ iter->fi.fileVersionNum = cpu_to_le16(1);
+ iter->fi.fileCharacteristics = 0;
+ iter->fi.lengthFileIdent = namelen;
+ iter->fi.lengthOfImpUse = cpu_to_le16(0);
+ memcpy(iter->namebuf, name, namelen);
+ iter->name = iter->namebuf;
+ return 0;
+ }
+ }
+ }
+ if (ret) {
+ udf_fiiter_release(iter);
+ return ret;
+ }
+ if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
+ blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) {
+ udf_fiiter_release(iter);
+ ret = udf_expand_dir_adinicb(dir, &block);
+ if (ret)
+ return ret;
+ ret = udf_fiiter_init(iter, dir, dir->i_size);
+ if (ret < 0)
+ return ret;
+ }
+
+ /* Get blocknumber to use for entry tag */
+ if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+ block = dinfo->i_location.logicalBlockNum;
+ } else {
+ block = iter->eloc.logicalBlockNum +
+ ((iter->elen - 1) >> dir->i_blkbits);
+ }
+ off = iter->pos & (blksize - 1);
+ if (!off)
+ off = blksize;
+ /* Entry fits into current block? */
+ if (blksize - udf_ext0_offset(dir) - off >= nfidlen)
+ goto store_fi;
+
+ ret = udf_fiiter_append_blk(iter);
+ if (ret) {
+ udf_fiiter_release(iter);
+ return ret;
+ }
+
+ /* Entry will be completely in the new block? Update tag location... */
+ if (!(iter->pos & (blksize - 1)))
+ block = iter->eloc.logicalBlockNum +
+ ((iter->elen - 1) >> dir->i_blkbits);
+store_fi:
+ memset(&iter->fi, 0, sizeof(struct fileIdentDesc));
+ if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200)
+ udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block,
+ sizeof(struct tag));
+ else
+ udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block,
+ sizeof(struct tag));
+ iter->fi.fileVersionNum = cpu_to_le16(1);
+ iter->fi.lengthFileIdent = namelen;
+ iter->fi.lengthOfImpUse = cpu_to_le16(0);
+ memcpy(iter->namebuf, name, namelen);
+ iter->name = iter->namebuf;
+
+ dir->i_size += nfidlen;
+ if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+ dinfo->i_lenAlloc += nfidlen;
+ } else {
+ /* Truncate last extent to proper size */
+ udf_fiiter_update_elen(iter, iter->elen -
+ (dinfo->i_lenExtents - dir->i_size));
+ }
+ mark_inode_dirty(dir);
+
+ return 0;
+}
+
+static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter)
+{
+ iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED;
+
+ if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT))
+ memset(&iter->fi.icb, 0x00, sizeof(struct long_ad));
+
+ udf_fiiter_write_fi(iter, NULL);
+}
+
+static void udf_add_fid_counter(struct super_block *sb, bool dir, int val)
+{
+ struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
+
+ if (!lvidiu)
+ return;
+ mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
+ if (dir)
+ le32_add_cpu(&lvidiu->numDirs, val);
+ else
+ le32_add_cpu(&lvidiu->numFiles, val);
+ udf_updated_lvid(sb);
+ mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
+}
+
+static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
+{
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ struct inode *dir = d_inode(dentry->d_parent);
+ struct udf_fileident_iter iter;
+ int err;
+
+ err = udf_fiiter_add_entry(dir, dentry, &iter);
+ if (err) {
+ inode_dec_link_count(inode);
+ discard_new_inode(inode);
+ return err;
+ }
+ iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+ iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
+ *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
+ cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
+ udf_fiiter_write_fi(&iter, NULL);
+ dir->i_mtime = inode_set_ctime_current(dir);
+ mark_inode_dirty(dir);
+ udf_fiiter_release(&iter);
+ udf_add_fid_counter(dir->i_sb, false, 1);
+ d_instantiate_new(dentry, inode);
+
+ return 0;
+}
+
+static int udf_create(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode, bool excl)
+{
+ struct inode *inode = udf_new_inode(dir, mode);
+
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+
+ inode->i_data.a_ops = &udf_aops;
+ inode->i_op = &udf_file_inode_operations;
+ inode->i_fop = &udf_file_operations;
+ mark_inode_dirty(inode);
+
+ return udf_add_nondir(dentry, inode);
+}
+
+static int udf_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
+ struct file *file, umode_t mode)
+{
+ struct inode *inode = udf_new_inode(dir, mode);
+
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+
+ inode->i_data.a_ops = &udf_aops;
+ inode->i_op = &udf_file_inode_operations;
+ inode->i_fop = &udf_file_operations;
+ mark_inode_dirty(inode);
+ d_tmpfile(file, inode);
+ unlock_new_inode(inode);
+ return finish_open_simple(file, 0);
+}
+
+static int udf_mknod(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode, dev_t rdev)
+{
+ struct inode *inode;
+
+ if (!old_valid_dev(rdev))
+ return -EINVAL;
+
+ inode = udf_new_inode(dir, mode);
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+
+ init_special_inode(inode, mode, rdev);
+ return udf_add_nondir(dentry, inode);
+}
+
+static int udf_mkdir(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode)
+{
+ struct inode *inode;
+ struct udf_fileident_iter iter;
+ int err;
+ struct udf_inode_info *dinfo = UDF_I(dir);
+ struct udf_inode_info *iinfo;
+
+ inode = udf_new_inode(dir, S_IFDIR | mode);
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+
+ iinfo = UDF_I(inode);
+ inode->i_op = &udf_dir_inode_operations;
+ inode->i_fop = &udf_dir_operations;
+ err = udf_fiiter_add_entry(inode, NULL, &iter);
+ if (err) {
+ clear_nlink(inode);
+ discard_new_inode(inode);
+ return err;
+ }
+ set_nlink(inode, 2);
+ iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+ iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
+ *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
+ cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
+ iter.fi.fileCharacteristics =
+ FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
+ udf_fiiter_write_fi(&iter, NULL);
+ udf_fiiter_release(&iter);
+ mark_inode_dirty(inode);
+
+ err = udf_fiiter_add_entry(dir, dentry, &iter);
+ if (err) {
+ clear_nlink(inode);
+ discard_new_inode(inode);
+ return err;
+ }
+ iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+ iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
+ *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
+ cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
+ iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
+ udf_fiiter_write_fi(&iter, NULL);
+ udf_fiiter_release(&iter);
+ udf_add_fid_counter(dir->i_sb, true, 1);
+ inc_nlink(dir);
+ dir->i_mtime = inode_set_ctime_current(dir);
+ mark_inode_dirty(dir);
+ d_instantiate_new(dentry, inode);
+
+ return 0;
+}
+
+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);
+ dir->i_mtime = 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);
+ dir->i_mtime = 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);
+ dir->i_mtime = 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;
+ 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;
+ }
+ 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);
+ }
+ old_dir->i_mtime = inode_set_ctime_current(old_dir);
+ new_dir->i_mtime = 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);
+
+ 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 inode *inode = NULL;
+ 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);
+ inode = udf_iget(child->d_sb, &tloc);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+
+ return d_obtain_alias(inode);
+}
+
+
+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,
+};