/* * namei.c * * PURPOSE * Inode name handling routines for the OSTA-UDF(tm) filesystem. * * COPYRIGHT * This file is distributed under the terms of the GNU General Public * License (GPL). Copies of the GPL can be obtained from: * ftp://prep.ai.mit.edu/pub/gnu/GPL * Each contributing author retains all rights to their own work. * * (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> 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); } int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi, struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh, uint8_t *impuse, uint8_t *fileident) { uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag); uint16_t crc; int offset; uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse); uint8_t lfi = cfi->lengthFileIdent; int padlen = fibh->eoffset - fibh->soffset - liu - lfi - sizeof(struct fileIdentDesc); int adinicb = 0; if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) adinicb = 1; offset = fibh->soffset + sizeof(struct fileIdentDesc); if (impuse) { if (adinicb || (offset + liu < 0)) { memcpy((uint8_t *)sfi->impUse, impuse, liu); } else if (offset >= 0) { memcpy(fibh->ebh->b_data + offset, impuse, liu); } else { memcpy((uint8_t *)sfi->impUse, impuse, -offset); memcpy(fibh->ebh->b_data, impuse - offset, liu + offset); } } offset += liu; if (fileident) { if (adinicb || (offset + lfi < 0)) { memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi); } else if (offset >= 0) { memcpy(fibh->ebh->b_data + offset, fileident, lfi); } else { memcpy((uint8_t *)sfi->fileIdent + liu, fileident, -offset); memcpy(fibh->ebh->b_data, fileident - offset, lfi + offset); } } offset += lfi; if (adinicb || (offset + padlen < 0)) { memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen); } else if (offset >= 0) { memset(fibh->ebh->b_data + offset, 0x00, padlen); } else { memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset); memset(fibh->ebh->b_data, 0x00, padlen + offset); } crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag), sizeof(struct fileIdentDesc) - sizeof(struct tag)); if (fibh->sbh == fibh->ebh) { crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, crclen + sizeof(struct tag) - sizeof(struct fileIdentDesc)); } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) { crc = crc_itu_t(crc, fibh->ebh->b_data + sizeof(struct fileIdentDesc) + fibh->soffset, crclen + sizeof(struct tag) - sizeof(struct fileIdentDesc)); } else { crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, -fibh->soffset - sizeof(struct fileIdentDesc)); crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset); } cfi->descTag.descCRC = cpu_to_le16(crc); cfi->descTag.descCRCLength = cpu_to_le16(crclen); cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag); if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) { memcpy((uint8_t *)sfi, (uint8_t *)cfi, sizeof(struct fileIdentDesc)); } else { memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset); memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset, sizeof(struct fileIdentDesc) + fibh->soffset); } if (adinicb) { mark_inode_dirty(inode); } else { if (fibh->sbh != fibh->ebh) mark_buffer_dirty_inode(fibh->ebh, inode); mark_buffer_dirty_inode(fibh->sbh, inode); } return 0; } /** * udf_find_entry - find entry in given directory. * * @dir: directory inode to search in * @child: qstr of the name * @fibh: buffer head / inode with file identifier descriptor we found * @cfi: found file identifier descriptor with given name * * This function searches in the directory @dir for a file name @child. When * found, @fibh points to the buffer head(s) (bh is NULL for in ICB * directories) containing the file identifier descriptor (FID). In that case * the function returns pointer to the FID in the buffer or inode - but note * that FID may be split among two buffers (blocks) so accessing it via that * pointer isn't easily possible. This pointer can be used only as an iterator * for other directory manipulation functions. For inspection of the FID @cfi * can be used - the found FID is copied there. * * Returns pointer to FID, NULL when nothing found, or error code. */ static struct fileIdentDesc *udf_find_entry(struct inode *dir, const struct qstr *child, struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi) { struct fileIdentDesc *fi = NULL; loff_t f_pos; int block, flen; unsigned char *fname = NULL, *copy_name = NULL; unsigned char *nameptr; uint8_t lfi; uint16_t liu; loff_t size; struct kernel_lb_addr eloc; uint32_t elen; sector_t offset; struct extent_position epos = {}; struct udf_inode_info *dinfo = UDF_I(dir); int isdotdot = child->len == 2 && child->name[0] == '.' && child->name[1] == '.'; struct super_block *sb = dir->i_sb; size = udf_ext0_offset(dir) + dir->i_size; f_pos = udf_ext0_offset(dir); fibh->sbh = fibh->ebh = NULL; fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1); if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos, &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { fi = ERR_PTR(-EIO); goto out_err; } block = udf_get_lb_pblock(sb, &eloc, offset); if ((++offset << 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(sb, block); if (!fibh->sbh) { fi = ERR_PTR(-EIO); goto out_err; } } fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); if (!fname) { fi = ERR_PTR(-ENOMEM); goto out_err; } while (f_pos < size) { fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, &elen, &offset); if (!fi) { fi = ERR_PTR(-EIO); goto out_err; } liu = le16_to_cpu(cfi->lengthOfImpUse); lfi = cfi->lengthFileIdent; if (fibh->sbh == fibh->ebh) { nameptr = fi->fileIdent + liu; } else { int poffset; /* Unpaded ending offset */ poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi; if (poffset >= lfi) nameptr = (uint8_t *)(fibh->ebh->b_data + poffset - lfi); else { if (!copy_name) { copy_name = kmalloc(UDF_NAME_LEN, GFP_NOFS); if (!copy_name) { fi = ERR_PTR(-ENOMEM); goto out_err; } } nameptr = copy_name; memcpy(nameptr, fi->fileIdent + liu, lfi - poffset); memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset); } } if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) continue; } if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) continue; } if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && isdotdot) goto out_ok; if (!lfi) continue; flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN); if (flen < 0) { fi = ERR_PTR(flen); goto out_err; } if (udf_match(flen, fname, child->len, child->name)) goto out_ok; } fi = NULL; out_err: if (fibh->sbh != fibh->ebh) brelse(fibh->ebh); brelse(fibh->sbh); out_ok: brelse(epos.bh); kfree(fname); kfree(copy_name); return fi; } static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { struct inode *inode = NULL; struct fileIdentDesc cfi; struct udf_fileident_bh fibh; struct fileIdentDesc *fi; if (dentry->d_name.len > UDF_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); #ifdef UDF_RECOVERY /* temporary shorthand for specifying files by inode number */ if (!strncmp(dentry->d_name.name, ".B=", 3)) { struct kernel_lb_addr lb = { .logicalBlockNum = 0, .partitionReferenceNum = simple_strtoul(dentry->d_name.name + 3, NULL, 0), }; inode = udf_iget(dir->i_sb, lb); if (IS_ERR(inode)) return inode; } else #endif /* UDF_RECOVERY */ fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); if (IS_ERR(fi)) return ERR_CAST(fi); if (fi) { struct kernel_lb_addr loc; if (fibh.sbh != fibh.ebh) brelse(fibh.ebh); brelse(fibh.sbh); loc = lelb_to_cpu(cfi.icb.extLocation); inode = udf_iget(dir->i_sb, &loc); if (IS_ERR(inode)) return ERR_CAST(inode); } return d_splice_alias(inode, dentry); } static struct fileIdentDesc *udf_add_entry(struct inode *dir, struct dentry *dentry, struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi, int *err) { struct super_block *sb = dir->i_sb; struct fileIdentDesc *fi = NULL; unsigned char *name = NULL; int namelen; loff_t f_pos; loff_t size = udf_ext0_offset(dir) + dir->i_size; int nfidlen; uint8_t lfi; uint16_t liu; int block; struct kernel_lb_addr eloc; uint32_t elen = 0; sector_t offset; struct extent_position epos = {}; struct udf_inode_info *dinfo; fibh->sbh = fibh->ebh = NULL; name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); if (!name) { *err = -ENOMEM; goto out_err; } if (dentry) { if (!dentry->d_name.len) { *err = -EINVAL; goto out_err; } namelen = udf_put_filename(sb, dentry->d_name.name, dentry->d_name.len, name, UDF_NAME_LEN_CS0); if (!namelen) { *err = -ENAMETOOLONG; goto out_err; } } else { namelen = 0; } nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3; f_pos = udf_ext0_offset(dir); fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); dinfo = UDF_I(dir); if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 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, &dinfo->i_location, 0); fibh->soffset = fibh->eoffset = sb->s_blocksize; goto add; } 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) { *err = -EIO; goto out_err; } block = dinfo->i_location.logicalBlockNum; } while (f_pos < size) { fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, &elen, &offset); if (!fi) { *err = -EIO; goto out_err; } liu = le16_to_cpu(cfi->lengthOfImpUse); lfi = cfi->lengthFileIdent; if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { if (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen) { cfi->descTag.tagSerialNum = cpu_to_le16(1); cfi->fileVersionNum = cpu_to_le16(1); cfi->fileCharacteristics = 0; cfi->lengthFileIdent = namelen; cfi->lengthOfImpUse = cpu_to_le16(0); if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) goto out_ok; else { *err = -EIO; goto out_err; } } } } add: f_pos += nfidlen; if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 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_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_bh fibh; struct fileIdentDesc cfi, *fi; int err; fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); if (unlikely(!fi)) { inode_dec_link_count(inode); unlock_new_inode(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); dir->i_ctime = dir->i_mtime = current_time(dir); mark_inode_dirty(dir); if (fibh.sbh != fibh.ebh) brelse(fibh.ebh); brelse(fibh.sbh); unlock_new_inode(inode); d_instantiate(dentry, inode); return 0; } static int udf_create(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); if (UDF_I(inode)->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); return udf_add_nondir(dentry, inode); } static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) { struct inode *inode = udf_new_inode(dir, mode); if (IS_ERR(inode)) return PTR_ERR(inode); if (UDF_I(inode)->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); d_tmpfile(dentry, inode); unlock_new_inode(inode); return 0; } static int udf_mknod(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 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; 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; fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); if (!fi) { inode_dec_link_count(inode); unlock_new_inode(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); unlock_new_inode(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); dir->i_ctime = dir->i_mtime = current_time(dir); mark_inode_dirty(dir); unlock_new_inode(inode); 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 = d_inode(dentry); 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 (IS_ERR_OR_NULL(fi)) { if (fi) retval = PTR_ERR(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_time(inode); 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 = d_inode(dentry); 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 (IS_ERR_OR_NULL(fi)) { if (fi) retval = PTR_ERR(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_time(dir); 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 = 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; int 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; 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, 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); unlock_new_inode(inode); iput(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_bh fibh; struct fileIdentDesc cfi, *fi; int err; 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_time(inode); mark_inode_dirty(inode); dir->i_ctime = dir->i_mtime = current_time(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 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_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); if (flags & ~RENAME_NOREPLACE) return -EINVAL; ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); if (IS_ERR(ofi)) { retval = PTR_ERR(ofi); goto end_rename; } 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 (IS_ERR(nfi)) { retval = PTR_ERR(nfi); goto end_rename; } if (nfi && !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; } 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_time(old_inode); 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_time(new_inode); inode_dec_link_count(new_inode); } old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); mark_inode_dirty(old_dir); mark_inode_dirty(new_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 = QSTR_INIT("..", 2); struct fileIdentDesc cfi; struct udf_fileident_bh fibh; if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi)) return ERR_PTR(-EACCES); if (fibh.sbh != fibh.ebh) brelse(fibh.ebh); brelse(fibh.sbh); tloc = lelb_to_cpu(cfi.icb.extLocation); 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, };