/* * 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/quotaops.h> #include <linux/smp_lock.h> #include <linux/buffer_head.h> static inline int udf_match(int len1, const char *name1, int len2, const 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(tag); uint16_t crc; uint8_t checksum = 0; int i; 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_ALLOCTYPE(inode) == 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 = udf_crc((uint8_t *)cfi + sizeof(tag), sizeof(struct fileIdentDesc) - sizeof(tag), 0); if (fibh->sbh == fibh->ebh) crc = udf_crc((uint8_t *)sfi->impUse, crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc); else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) crc = udf_crc(fibh->ebh->b_data + sizeof(struct fileIdentDesc) + fibh->soffset, crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc); else { crc = udf_crc((uint8_t *)sfi->impUse, -fibh->soffset - sizeof(struct fileIdentDesc), crc); crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc); } cfi->descTag.descCRC = cpu_to_le16(crc); cfi->descTag.descCRCLength = cpu_to_le16(crclen); for (i=0; i<16; i++) if (i != 4) checksum += ((uint8_t *)&cfi->descTag)[i]; cfi->descTag.tagChecksum = checksum; 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; } static struct fileIdentDesc * udf_find_entry(struct inode *dir, struct dentry *dentry, struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi) { struct fileIdentDesc *fi=NULL; loff_t f_pos; int block, flen; char fname[UDF_NAME_LEN]; char *nameptr; uint8_t lfi; uint16_t liu; loff_t size; kernel_lb_addr bloc, eloc; uint32_t extoffset, elen, offset; struct buffer_head *bh = NULL; size = (udf_ext0_offset(dir) + dir->i_size) >> 2; f_pos = (udf_ext0_offset(dir) >> 2); fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2; if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) fibh->sbh = fibh->ebh = NULL; else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) { offset >>= dir->i_sb->s_blocksize_bits; block = udf_get_lb_pblock(dir->i_sb, eloc, offset); if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) extoffset -= sizeof(short_ad); else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) extoffset -= sizeof(long_ad); } else offset = 0; if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) { udf_release_data(bh); return NULL; } } else { udf_release_data(bh); return NULL; } while ( (f_pos < size) ) { fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); if (!fi) { if (fibh->sbh != fibh->ebh) udf_release_data(fibh->ebh); udf_release_data(fibh->sbh); udf_release_data(bh); return NULL; } 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 { nameptr = fname; 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(dir->i_sb, UDF_FLAG_UNDELETE) ) continue; } if ( (cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 ) { if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) ) continue; } if (!lfi) continue; if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi))) { if (udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name)) { udf_release_data(bh); return fi; } } } if (fibh->sbh != fibh->ebh) udf_release_data(fibh->ebh); udf_release_data(fibh->sbh); udf_release_data(bh); return NULL; } /* * udf_lookup * * PURPOSE * Look-up the inode for a given name. * * DESCRIPTION * Required - lookup_dentry() will return -ENOTDIR if this routine is not * available for a directory. The filesystem is useless if this routine is * not available for at least the filesystem's root directory. * * This routine is passed an incomplete dentry - it must be completed by * calling d_add(dentry, inode). If the name does not exist, then the * specified inode must be set to null. An error should only be returned * when the lookup fails for a reason other than the name not existing. * Note that the directory inode semaphore is held during the call. * * Refer to lookup_dentry() in fs/namei.c * lookup_dentry() -> lookup() -> real_lookup() -> . * * PRE-CONDITIONS * dir Pointer to inode of parent directory. * dentry Pointer to dentry to complete. * nd Pointer to lookup nameidata * * POST-CONDITIONS * <return> Zero on success. * * HISTORY * July 1, 1997 - Andrew E. Mileski * Written, tested, and released. */ static struct dentry * udf_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { struct inode *inode = NULL; struct fileIdentDesc cfi; struct udf_fileident_bh fibh; if (dentry->d_name.len > UDF_NAME_LEN-2) return ERR_PTR(-ENAMETOOLONG); lock_kernel(); #ifdef UDF_RECOVERY /* temporary shorthand for specifying files by inode number */ if (!strncmp(dentry->d_name.name, ".B=", 3) ) { kernel_lb_addr lb = { 0, simple_strtoul(dentry->d_name.name+3, NULL, 0) }; inode = udf_iget(dir->i_sb, lb); if (!inode) { unlock_kernel(); return ERR_PTR(-EACCES); } } else #endif /* UDF_RECOVERY */ if (udf_find_entry(dir, dentry, &fibh, &cfi)) { if (fibh.sbh != fibh.ebh) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation)); if ( !inode ) { unlock_kernel(); return ERR_PTR(-EACCES); } } unlock_kernel(); d_add(dentry, inode); return NULL; } 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; struct fileIdentDesc *fi=NULL; char name[UDF_NAME_LEN], fname[UDF_NAME_LEN]; int namelen; loff_t f_pos; int flen; char *nameptr; loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2; int nfidlen; uint8_t lfi; uint16_t liu; int block; kernel_lb_addr bloc, eloc; uint32_t extoffset, elen, offset; struct buffer_head *bh = NULL; sb = dir->i_sb; if (dentry) { if (!dentry->d_name.len) { *err = -EINVAL; return NULL; } if ( !(namelen = udf_put_filename(sb, dentry->d_name.name, name, dentry->d_name.len))) { *err = -ENAMETOOLONG; return NULL; } } else namelen = 0; nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3; f_pos = (udf_ext0_offset(dir) >> 2); fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2; if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) fibh->sbh = fibh->ebh = NULL; else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) { offset >>= dir->i_sb->s_blocksize_bits; block = udf_get_lb_pblock(dir->i_sb, eloc, offset); if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) extoffset -= sizeof(short_ad); else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) extoffset -= sizeof(long_ad); } else offset = 0; if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) { udf_release_data(bh); *err = -EIO; return NULL; } block = UDF_I_LOCATION(dir).logicalBlockNum; } else { block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0); fibh->sbh = fibh->ebh = NULL; fibh->soffset = fibh->eoffset = sb->s_blocksize; goto add; } while ( (f_pos < size) ) { fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); if (!fi) { if (fibh->sbh != fibh->ebh) udf_release_data(fibh->ebh); udf_release_data(fibh->sbh); udf_release_data(bh); *err = -EIO; return NULL; } 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 = (char *)(fibh->ebh->b_data + poffset - lfi); else { nameptr = fname; 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 (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen) { udf_release_data(bh); 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)) return fi; else { *err = -EIO; return NULL; } } } if (!lfi || !dentry) continue; if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)) && udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name)) { if (fibh->sbh != fibh->ebh) udf_release_data(fibh->ebh); udf_release_data(fibh->sbh); udf_release_data(bh); *err = -EEXIST; return NULL; } } add: f_pos += nfidlen; if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB && sb->s_blocksize - fibh->eoffset < nfidlen) { udf_release_data(bh); bh = NULL; fibh->soffset -= udf_ext0_offset(dir); fibh->eoffset -= udf_ext0_offset(dir); f_pos -= (udf_ext0_offset(dir) >> 2); if (fibh->sbh != fibh->ebh) udf_release_data(fibh->ebh); udf_release_data(fibh->sbh); if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err))) return NULL; bloc = UDF_I_LOCATION(dir); eloc.logicalBlockNum = block; eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum; elen = dir->i_sb->s_blocksize; extoffset = udf_file_entry_alloc_offset(dir); if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) extoffset += sizeof(short_ad); else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) extoffset += sizeof(long_ad); } if (sb->s_blocksize - fibh->eoffset >= nfidlen) { fibh->soffset = fibh->eoffset; fibh->eoffset += nfidlen; if (fibh->sbh != fibh->ebh) { udf_release_data(fibh->sbh); fibh->sbh = fibh->ebh; } if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) { block = UDF_I_LOCATION(dir).logicalBlockNum; fi = (struct fileIdentDesc *)(UDF_I_DATA(dir) + fibh->soffset - udf_ext0_offset(dir) + UDF_I_LENEATTR(dir)); } else { block = eloc.logicalBlockNum + ((elen - 1) >> dir->i_sb->s_blocksize_bits); fi = (struct fileIdentDesc *)(fibh->sbh->b_data + fibh->soffset); } } else { fibh->soffset = fibh->eoffset - sb->s_blocksize; fibh->eoffset += nfidlen - sb->s_blocksize; if (fibh->sbh != fibh->ebh) { udf_release_data(fibh->sbh); fibh->sbh = fibh->ebh; } block = eloc.logicalBlockNum + ((elen - 1) >> dir->i_sb->s_blocksize_bits); if (!(fibh->ebh = udf_bread(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), 1, err))) { udf_release_data(bh); udf_release_data(fibh->sbh); return NULL; } if (!(fibh->soffset)) { if (udf_next_aext(dir, &bloc, &extoffset, &eloc, &elen, &bh, 1) == (EXT_RECORDED_ALLOCATED >> 30)) { block = eloc.logicalBlockNum + ((elen - 1) >> dir->i_sb->s_blocksize_bits); } else block ++; udf_release_data(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_UDFREV(sb) >= 0x0200) udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, sizeof(tag)); else udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, sizeof(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)) { udf_release_data(bh); dir->i_size += nfidlen; if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) UDF_I_LENALLOC(dir) += nfidlen; mark_inode_dirty(dir); return fi; } else { udf_release_data(bh); if (fibh->sbh != fibh->ebh) udf_release_data(fibh->ebh); udf_release_data(fibh->sbh); *err = -EIO; return NULL; } } 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(long_ad)); return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); } static int udf_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) { struct udf_fileident_bh fibh; struct inode *inode; struct fileIdentDesc cfi, *fi; int err; lock_kernel(); inode = udf_new_inode(dir, mode, &err); if (!inode) { unlock_kernel(); return err; } if (UDF_I_ALLOCTYPE(inode) == 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; inode->i_mode = mode; mark_inode_dirty(inode); if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) { inode->i_nlink --; mark_inode_dirty(inode); iput(inode); unlock_kernel(); return err; } cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL); udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) { mark_inode_dirty(dir); } if (fibh.sbh != fibh.ebh) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); unlock_kernel(); d_instantiate(dentry, inode); return 0; } static int udf_mknod(struct inode * dir, struct dentry * dentry, int mode, dev_t rdev) { struct inode * inode; struct udf_fileident_bh fibh; struct fileIdentDesc cfi, *fi; int err; if (!old_valid_dev(rdev)) return -EINVAL; lock_kernel(); err = -EIO; inode = udf_new_inode(dir, mode, &err); if (!inode) goto out; inode->i_uid = current->fsuid; init_special_inode(inode, mode, rdev); if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) { inode->i_nlink --; mark_inode_dirty(inode); iput(inode); unlock_kernel(); return err; } cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL); udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) { mark_inode_dirty(dir); } mark_inode_dirty(inode); if (fibh.sbh != fibh.ebh) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); d_instantiate(dentry, inode); err = 0; out: unlock_kernel(); return err; } static int udf_mkdir(struct inode * dir, struct dentry * dentry, int mode) { struct inode * inode; struct udf_fileident_bh fibh; struct fileIdentDesc cfi, *fi; int err; lock_kernel(); err = -EMLINK; if (dir->i_nlink >= (256<<sizeof(dir->i_nlink))-1) goto out; err = -EIO; inode = udf_new_inode(dir, S_IFDIR, &err); if (!inode) goto out; inode->i_op = &udf_dir_inode_operations; inode->i_fop = &udf_dir_operations; if (!(fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err))) { inode->i_nlink--; mark_inode_dirty(inode); iput(inode); goto out; } inode->i_nlink = 2; cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(dir)); *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL); cfi.fileCharacteristics = FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); udf_release_data(fibh.sbh); inode->i_mode = S_IFDIR | mode; if (dir->i_mode & S_ISGID) inode->i_mode |= S_ISGID; mark_inode_dirty(inode); if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) { inode->i_nlink = 0; 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(UDF_I_LOCATION(inode)); *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = cpu_to_le32(UDF_I_UNIQUE(inode) & 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) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); err = 0; out: unlock_kernel(); 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) >> 2; int block; kernel_lb_addr bloc, eloc; uint32_t extoffset, elen, offset; struct buffer_head *bh = NULL; f_pos = (udf_ext0_offset(dir) >> 2); fibh.soffset = fibh.eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2; if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) fibh.sbh = fibh.ebh = NULL; else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) { offset >>= dir->i_sb->s_blocksize_bits; block = udf_get_lb_pblock(dir->i_sb, eloc, offset); if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) extoffset -= sizeof(short_ad); else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) extoffset -= sizeof(long_ad); } else offset = 0; if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) { udf_release_data(bh); return 0; } } else { udf_release_data(bh); return 0; } while ( (f_pos < size) ) { fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); if (!fi) { if (fibh.sbh != fibh.ebh) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); udf_release_data(bh); return 0; } if (cfi.lengthFileIdent && (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { if (fibh.sbh != fibh.ebh) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); udf_release_data(bh); return 0; } } if (fibh.sbh != fibh.ebh) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); udf_release_data(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; kernel_lb_addr tloc; retval = -ENOENT; lock_kernel(); fi = udf_find_entry(dir, dentry, &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_warning(inode->i_sb, "udf_rmdir", "empty directory has nlink != 2 (%d)", inode->i_nlink); clear_nlink(inode); inode->i_size = 0; inode_dec_link_count(inode); 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) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); out: unlock_kernel(); 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; kernel_lb_addr tloc; retval = -ENOENT; lock_kernel(); fi = udf_find_entry(dir, dentry, &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); inode->i_nlink = 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) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); out: unlock_kernel(); return retval; } static int udf_symlink(struct inode * dir, struct dentry * dentry, const char * symname) { struct inode * inode; struct pathComponent *pc; char *compstart; struct udf_fileident_bh fibh; struct buffer_head *bh = NULL; int eoffset, elen = 0; struct fileIdentDesc *fi; struct fileIdentDesc cfi; char *ea; int err; int block; char name[UDF_NAME_LEN]; int namelen; lock_kernel(); if (!(inode = udf_new_inode(dir, S_IFLNK, &err))) goto out; inode->i_mode = S_IFLNK | S_IRWXUGO; inode->i_data.a_ops = &udf_symlink_aops; inode->i_op = &page_symlink_inode_operations; if (UDF_I_ALLOCTYPE(inode) != ICBTAG_FLAG_AD_IN_ICB) { struct buffer_head *bh = NULL; kernel_lb_addr bloc, eloc; uint32_t elen, extoffset; block = udf_new_block(inode->i_sb, inode, UDF_I_LOCATION(inode).partitionReferenceNum, UDF_I_LOCATION(inode).logicalBlockNum, &err); if (!block) goto out_no_entry; bloc = UDF_I_LOCATION(inode); eloc.logicalBlockNum = block; eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum; elen = inode->i_sb->s_blocksize; UDF_I_LENEXTENTS(inode) = elen; extoffset = udf_file_entry_alloc_offset(inode); udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 0); udf_release_data(bh); block = udf_get_pblock(inode->i_sb, block, UDF_I_LOCATION(inode).partitionReferenceNum, 0); bh = udf_tread(inode->i_sb, block); lock_buffer(bh); memset(bh->b_data, 0x00, inode->i_sb->s_blocksize); set_buffer_uptodate(bh); unlock_buffer(bh); mark_buffer_dirty_inode(bh, inode); ea = bh->b_data + udf_ext0_offset(inode); } else ea = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode); eoffset = inode->i_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; pc += sizeof(struct pathComponent); elen += sizeof(struct pathComponent); } err = -ENAMETOOLONG; while (*symname) { if (elen + sizeof(struct pathComponent) > eoffset) goto out_no_entry; pc = (struct pathComponent *)(ea + elen); compstart = (char *)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) { if ( !(namelen = udf_put_filename(inode->i_sb, compstart, name, symname-compstart))) 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 == '/'); } } udf_release_data(bh); inode->i_size = elen; if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) UDF_I_LENALLOC(inode) = inode->i_size; mark_inode_dirty(inode); if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) goto out_no_entry; cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); if (UDF_SB_LVIDBH(inode->i_sb)) { struct logicalVolHeaderDesc *lvhd; uint64_t uniqueID; lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse); uniqueID = le64_to_cpu(lvhd->uniqueID); *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL); if (!(++uniqueID & 0x00000000FFFFFFFFUL)) uniqueID += 16; lvhd->uniqueID = cpu_to_le64(uniqueID); mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb)); } udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) { mark_inode_dirty(dir); } if (fibh.sbh != fibh.ebh) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); d_instantiate(dentry, inode); err = 0; out: unlock_kernel(); return err; out_no_entry: 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; lock_kernel(); if (inode->i_nlink >= (256<<sizeof(inode->i_nlink))-1) { unlock_kernel(); return -EMLINK; } if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) { unlock_kernel(); return err; } cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); if (UDF_SB_LVIDBH(inode->i_sb)) { struct logicalVolHeaderDesc *lvhd; uint64_t uniqueID; lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse); uniqueID = le64_to_cpu(lvhd->uniqueID); *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL); if (!(++uniqueID & 0x00000000FFFFFFFFUL)) uniqueID += 16; lvhd->uniqueID = cpu_to_le64(uniqueID); mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb)); } udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) { mark_inode_dirty(dir); } if (fibh.sbh != fibh.ebh) udf_release_data(fibh.ebh); udf_release_data(fibh.sbh); inc_nlink(inode); inode->i_ctime = current_fs_time(inode->i_sb); mark_inode_dirty(inode); atomic_inc(&inode->i_count); d_instantiate(dentry, inode); unlock_kernel(); 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, ocfi, ncfi; struct buffer_head *dir_bh = NULL; int retval = -ENOENT; kernel_lb_addr tloc; lock_kernel(); if ((ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi))) { if (ofibh.sbh != ofibh.ebh) udf_release_data(ofibh.ebh); udf_release_data(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, &nfibh, &ncfi); if (nfi) { if (!new_inode) { if (nfibh.sbh != nfibh.ebh) udf_release_data(nfibh.ebh); udf_release_data(nfibh.sbh); nfi = NULL; } } if (S_ISDIR(old_inode->i_mode)) { uint32_t offset = udf_ext0_offset(old_inode); if (new_inode) { retval = -ENOTEMPTY; if (!empty_dir(new_inode)) goto end_rename; } retval = -EIO; if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB) { dir_fi = udf_get_fileident(UDF_I_DATA(old_inode) - (UDF_I_EFE(old_inode) ? 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 >= (256<<sizeof(new_dir->i_nlink))-1) 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(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, &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_LOCATION(new_dir)); udf_update_tag((char *)dir_fi, (sizeof(struct fileIdentDesc) + le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3); if (UDF_I_ALLOCTYPE(old_inode) == 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) udf_release_data(ofibh.ebh); udf_release_data(ofibh.sbh); } retval = 0; end_rename: udf_release_data(dir_bh); if (nfi) { if (nfibh.sbh != nfibh.ebh) udf_release_data(nfibh.ebh); udf_release_data(nfibh.sbh); } unlock_kernel(); return retval; } 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, };