diff options
Diffstat (limited to 'fs/udf/namei.c')
| -rw-r--r-- | fs/udf/namei.c | 1334 |
1 files changed, 1334 insertions, 0 deletions
diff --git a/fs/udf/namei.c b/fs/udf/namei.c new file mode 100644 index 000000000000..3f6dc7112bc6 --- /dev/null +++ b/fs/udf/namei.c @@ -0,0 +1,1334 @@ +/* + * namei.c + * + * PURPOSE + * Inode name handling routines for the OSTA-UDF(tm) filesystem. + * + * CONTACTS + * E-mail regarding any portion of the Linux UDF file system should be + * directed to the development team mailing list (run by majordomo): + * linux_udf@hpesjro.fc.hp.com + * + * 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 = (udf_ext0_offset(dir) + dir->i_size) >> 2; + kernel_lb_addr bloc, eloc; + uint32_t extoffset, elen, offset; + struct buffer_head *bh = NULL; + + if (!dir) + return 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 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, *fi; + 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 ((fi = 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); + dir->i_nlink++; + 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); + inode->i_nlink = 0; + inode->i_size = 0; + mark_inode_dirty(inode); + dir->i_nlink --; + 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->i_nlink--; + mark_inode_dirty(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->i_nlink--; + mark_inode_dirty(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); + inode->i_nlink ++; + 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_nlink--; + new_inode->i_ctime = current_fs_time(new_inode->i_sb); + mark_inode_dirty(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); + old_dir->i_nlink --; + mark_inode_dirty(old_dir); + if (new_inode) + { + new_inode->i_nlink --; + mark_inode_dirty(new_inode); + } + else + { + new_dir->i_nlink ++; + 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; +} + +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, +}; |