diff options
Diffstat (limited to 'fs/udf/namei.c')
| -rw-r--r-- | fs/udf/namei.c | 1017 |
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, +}; |