namei.c
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上传日期:2013-02-24
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文件大小:32k
- /*
- * 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) 1998-2000 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/locks.h>
- #include <linux/smp_lock.h>
- #include <linux/udf_fs.h>
- static inline int udf_match(int len, const char * const name, struct qstr *qs)
- {
- if (len != qs->len)
- return 0;
- return !memcmp(name, qs->name, len);
- }
- int udf_write_fi(struct inode *inode, struct FileIdentDesc *cfi,
- struct FileIdentDesc *sfi, struct udf_fileident_bh *fibh,
- Uint8 *impuse, Uint8 *fileident)
- {
- Uint16 crclen = fibh->eoffset - fibh->soffset - sizeof(tag);
- Uint16 crc;
- Uint8 checksum = 0;
- int i;
- int offset;
- Uint16 liu = le16_to_cpu(cfi->lengthOfImpUse);
- Uint8 lfi = cfi->lengthFileIdent;
- int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
- sizeof(struct FileIdentDesc);
- offset = fibh->soffset + sizeof(struct FileIdentDesc);
- if (impuse)
- {
- if (offset + liu < 0)
- memcpy((Uint8 *)sfi->impUse, impuse, liu);
- else if (offset >= 0)
- memcpy(fibh->ebh->b_data + offset, impuse, liu);
- else
- {
- memcpy((Uint8 *)sfi->impUse, impuse, -offset);
- memcpy(fibh->ebh->b_data, impuse - offset, liu + offset);
- }
- }
- offset += liu;
- if (fileident)
- {
- if (offset + lfi < 0)
- memcpy((Uint8 *)sfi->fileIdent + liu, fileident, lfi);
- else if (offset >= 0)
- memcpy(fibh->ebh->b_data + offset, fileident, lfi);
- else
- {
- memcpy((Uint8 *)sfi->fileIdent + liu, fileident, -offset);
- memcpy(fibh->ebh->b_data, fileident - offset, lfi + offset);
- }
- }
- offset += lfi;
- if (offset + padlen < 0)
- memset((Uint8 *)sfi->padding + liu + lfi, 0x00, padlen);
- else if (offset >= 0)
- memset(fibh->ebh->b_data + offset, 0x00, padlen);
- else
- {
- memset((Uint8 *)sfi->padding + liu + lfi, 0x00, -offset);
- memset(fibh->ebh->b_data, 0x00, padlen + offset);
- }
- crc = udf_crc((Uint8 *)cfi + sizeof(tag), sizeof(struct FileIdentDesc) -
- sizeof(tag), 0);
- if (fibh->sbh == fibh->ebh)
- crc = udf_crc((Uint8 *)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 *)sfi->impUse,
- -fibh->soffset - sizeof(struct FileIdentDesc), crc);
- crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc);
- }
- cfi->descTag.descCRC = cpu_to_le32(crc);
- cfi->descTag.descCRCLength = cpu_to_le16(crclen);
- for (i=0; i<16; i++)
- if (i != 4)
- checksum += ((Uint8 *)&cfi->descTag)[i];
- cfi->descTag.tagChecksum = checksum;
- if (sizeof(struct FileIdentDesc) <= -fibh->soffset)
- memcpy((Uint8 *)sfi, (Uint8 *)cfi, sizeof(struct FileIdentDesc));
- else
- {
- memcpy((Uint8 *)sfi, (Uint8 *)cfi, -fibh->soffset);
- memcpy(fibh->ebh->b_data, (Uint8 *)cfi - fibh->soffset,
- sizeof(struct FileIdentDesc) + fibh->soffset);
- }
- 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[255];
- char *nameptr;
- Uint8 lfi;
- Uint16 liu;
- loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
- lb_addr bloc, eloc;
- Uint32 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 (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
- &bloc, &extoffset, &eloc, &elen, &offset, &bh) == EXTENT_RECORDED_ALLOCATED)
- {
- 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) == ICB_FLAG_AD_SHORT)
- extoffset -= sizeof(short_ad);
- else if (UDF_I_ALLOCTYPE(dir) == ICB_FLAG_AD_LONG)
- extoffset -= sizeof(long_ad);
- }
- else
- offset = 0;
- }
- else
- {
- udf_release_data(bh);
- return NULL;
- }
- if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
- {
- 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 *)(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 & FILE_DELETED) != 0 )
- {
- if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) )
- continue;
- }
-
- if ( (cfi->fileCharacteristics & FILE_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)))
- {
- 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.
- *
- * 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 inode *inode = NULL;
- struct FileIdentDesc cfi, *fi;
- struct udf_fileident_bh fibh;
- 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) )
- {
- lb_addr lb = { 0, simple_strtoul(dentry->d_name.name+3, NULL, 0) };
- inode = udf_iget(dir->i_sb, lb);
- if (!inode)
- 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 )
- return ERR_PTR(-EACCES);
- }
- 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;
- struct ustr unifilename;
- 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 lfi;
- Uint16 liu;
- int block;
- lb_addr bloc, eloc;
- Uint32 extoffset, elen, offset;
- struct buffer_head *bh = NULL;
- sb = dir->i_sb;
- if (dentry)
- {
- if (!dentry->d_name.len)
- {
- *err = -EINVAL;
- return NULL;
- }
- if ( !(udf_char_to_ustr(&unifilename, dentry->d_name.name, dentry->d_name.len)) )
- {
- *err = -ENAMETOOLONG;
- return NULL;
- }
- if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
- {
- if ( !(namelen = udf_UTF8toCS0(name, &unifilename, UDF_NAME_LEN)) )
- {
- *err = -ENAMETOOLONG;
- return NULL;
- }
- }
- else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
- {
- if ( !(namelen = udf_NLStoCS0(UDF_SB(sb)->s_nls_map, name, &unifilename, UDF_NAME_LEN)) )
- {
- *err = -ENAMETOOLONG;
- return NULL;
- }
- }
- else
- 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 (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
- &bloc, &extoffset, &eloc, &elen, &offset, &bh) == EXTENT_RECORDED_ALLOCATED)
- {
- 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) == ICB_FLAG_AD_SHORT)
- extoffset -= sizeof(short_ad);
- else if (UDF_I_ALLOCTYPE(dir) == ICB_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;
-
- 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 & FILE_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)))
- {
- if (fibh->sbh != fibh->ebh)
- udf_release_data(fibh->ebh);
- udf_release_data(fibh->sbh);
- udf_release_data(bh);
- *err = -EEXIST;
- return NULL;
- }
- }
- }
- else
- {
- block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0);
- if (UDF_I_ALLOCTYPE(dir) == ICB_FLAG_AD_IN_ICB)
- {
- fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
- fibh->soffset = fibh->eoffset = udf_file_entry_alloc_offset(dir);
- }
- else
- {
- fibh->sbh = fibh->ebh = NULL;
- fibh->soffset = fibh->eoffset = sb->s_blocksize;
- }
- }
- f_pos += nfidlen;
- if (UDF_I_ALLOCTYPE(dir) == ICB_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) == ICB_FLAG_AD_SHORT)
- extoffset += sizeof(short_ad);
- else if (UDF_I_ALLOCTYPE(dir) == ICB_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) != ICB_FLAG_AD_IN_ICB)
- block = eloc.logicalBlockNum + ((elen - 1) >>
- dir->i_sb->s_blocksize_bits);
- else
- block = UDF_I_LOCATION(dir).logicalBlockNum;
-
- 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) ==
- EXTENT_RECORDED_ALLOCATED)
- {
- 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));
- udf_new_tag((char *)cfi, TID_FILE_IDENT_DESC, 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) == ICB_FLAG_AD_IN_ICB)
- UDF_I_LENALLOC(dir) += nfidlen;
- dir->i_version = ++event;
- 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 |= FILE_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 udf_fileident_bh fibh;
- struct inode *inode;
- struct FileIdentDesc cfi, *fi;
- int err;
- inode = udf_new_inode(dir, mode, &err);
- if (!inode)
- return err;
- if (UDF_I_ALLOCTYPE(inode) == ICB_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);
- return err;
- }
- cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
- cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
- *(Uint32 *)((struct ADImpUse *)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) == ICB_FLAG_AD_IN_ICB)
- {
- mark_inode_dirty(dir);
- dir->i_version = ++event;
- }
- if (fibh.sbh != fibh.ebh)
- udf_release_data(fibh.ebh);
- udf_release_data(fibh.sbh);
- d_instantiate(dentry, inode);
- return 0;
- }
- static int udf_mknod(struct inode * dir, struct dentry * dentry, int mode, int rdev)
- {
- struct inode * inode;
- struct udf_fileident_bh fibh;
- int err;
- struct FileIdentDesc cfi, *fi;
- 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);
- return err;
- }
- cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
- cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
- *(Uint32 *)((struct ADImpUse *)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) == ICB_FLAG_AD_IN_ICB)
- {
- mark_inode_dirty(dir);
- dir->i_version = ++event;
- }
- 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:
- return err;
- }
- static int udf_mkdir(struct inode * dir, struct dentry * dentry, int mode)
- {
- struct inode * inode;
- struct udf_fileident_bh fibh;
- int err;
- struct FileIdentDesc cfi, *fi;
- 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));
- *(Uint32 *)((struct ADImpUse *)cfi.icb.impUse)->impUse =
- cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL);
- cfi.fileCharacteristics = FILE_DIRECTORY | FILE_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));
- *(Uint32 *)((struct ADImpUse *)cfi.icb.impUse)->impUse =
- cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
- cfi.fileCharacteristics |= FILE_DIRECTORY;
- udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
- dir->i_version = ++event;
- 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:
- 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;
- lb_addr bloc, eloc;
- Uint32 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 (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
- &bloc, &extoffset, &eloc, &elen, &offset, &bh) == EXTENT_RECORDED_ALLOCATED)
- {
- 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) == ICB_FLAG_AD_SHORT)
- extoffset -= sizeof(short_ad);
- else if (UDF_I_ALLOCTYPE(dir) == ICB_FLAG_AD_LONG)
- extoffset -= sizeof(long_ad);
- }
- else
- offset = 0;
- }
- else
- {
- udf_release_data(bh);
- return 0;
- }
- if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
- 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 & FILE_DELETED) == 0)
- {
- 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;
- retval = -ENOENT;
- fi = udf_find_entry(dir, dentry, &fibh, &cfi);
- if (!fi)
- goto out;
- retval = -EIO;
- if (udf_get_lb_pblock(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation), 0) != inode->i_ino)
- goto end_rmdir;
- retval = -ENOTEMPTY;
- if (!empty_dir(inode))
- goto end_rmdir;
- retval = udf_delete_entry(dir, fi, &fibh, &cfi);
- dir->i_version = ++event;
- 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_version = ++event;
- 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_TIME;
- UDF_I_UCTIME(inode) = UDF_I_UCTIME(dir) = UDF_I_UMTIME(dir) = CURRENT_UTIME;
- mark_inode_dirty(dir);
- end_rmdir:
- if (fibh.sbh != fibh.ebh)
- udf_release_data(fibh.ebh);
- udf_release_data(fibh.sbh);
- out:
- 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;
- retval = -ENOENT;
- fi = udf_find_entry(dir, dentry, &fibh, &cfi);
- if (!fi)
- goto out;
- retval = -EIO;
- if (udf_get_lb_pblock(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation), 0) !=
- inode->i_ino)
- {
- goto end_unlink;
- }
- if (!inode->i_nlink)
- {
- udf_debug("Deleting nonexistent file (%lu), %dn",
- 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_TIME;
- UDF_I_UCTIME(dir) = UDF_I_UMTIME(dir) = CURRENT_UTIME;
- 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:
- 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;
- 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) != ICB_FLAG_AD_IN_ICB)
- {
- struct buffer_head *bh = NULL;
- lb_addr bloc, eloc;
- Uint32 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);
- mark_buffer_uptodate(bh, 1);
- unlock_buffer(bh);
- mark_buffer_dirty_inode(bh, inode);
- }
- else
- {
- block = udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0);
- bh = udf_tread(inode->i_sb, block);
- }
- ea = bh->b_data + udf_ext0_offset(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 (pc->componentIdent[0] == '.')
- {
- if (pc->lengthComponentIdent == 1)
- pc->componentType = 4;
- else if (pc->lengthComponentIdent == 2 && pc->componentIdent[1] == '.')
- pc->componentType = 3;
- }
- if (pc->componentType == 5)
- {
- if (elen + sizeof(struct PathComponent) + symname - compstart > eoffset)
- goto out_no_entry;
- else
- pc->lengthComponentIdent = symname - compstart;
- memcpy(pc->componentIdent, compstart, pc->lengthComponentIdent);
- }
- 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) == ICB_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 uniqueID;
- lvhd = (struct LogicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
- uniqueID = le64_to_cpu(lvhd->uniqueID);
- *(Uint32 *)((struct ADImpUse *)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) == ICB_FLAG_AD_IN_ICB)
- {
- mark_inode_dirty(dir);
- dir->i_version = ++event;
- }
- if (fibh.sbh != fibh.ebh)
- udf_release_data(fibh.ebh);
- udf_release_data(fibh.sbh);
- d_instantiate(dentry, inode);
- err = 0;
- out:
- 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;
- int err;
- struct FileIdentDesc cfi, *fi;
- if (S_ISDIR(inode->i_mode))
- return -EPERM;
- if (inode->i_nlink >= (256<<sizeof(inode->i_nlink))-1)
- return -EMLINK;
- if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
- 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 uniqueID;
- lvhd = (struct LogicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
- uniqueID = le64_to_cpu(lvhd->uniqueID);
- *(Uint32 *)((struct ADImpUse *)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) == ICB_FLAG_AD_IN_ICB)
- {
- mark_inode_dirty(dir);
- dir->i_version = ++event;
- }
- if (fibh.sbh != fibh.ebh)
- udf_release_data(fibh.ebh);
- udf_release_data(fibh.sbh);
- inode->i_nlink ++;
- inode->i_ctime = CURRENT_TIME;
- UDF_I_UCTIME(inode) = CURRENT_UTIME;
- mark_inode_dirty(inode);
- atomic_inc(&inode->i_count);
- 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)
- {
- 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;
- 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);
- }
- if (!ofi || udf_get_lb_pblock(old_dir->i_sb, lelb_to_cpu(ocfi.icb.extLocation), 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 offset = udf_ext0_offset(old_inode);
- if (new_inode)
- {
- retval = -ENOTEMPTY;
- if (!empty_dir(new_inode))
- goto end_rename;
- }
- retval = -EIO;
- 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;
- if (udf_get_lb_pblock(old_inode->i_sb, cpu_to_lelb(dir_fi->icb.extLocation), 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;
- }
- new_dir->i_version = ++event;
- /*
- * Like most other Unix systems, set the ctime for inodes on a
- * rename.
- */
- old_inode->i_ctime = CURRENT_TIME;
- UDF_I_UCTIME(old_inode) = CURRENT_UTIME;
- 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);
- old_dir->i_version = ++event;
- if (new_inode)
- {
- new_inode->i_nlink--;
- new_inode->i_ctime = CURRENT_TIME;
- UDF_I_UCTIME(new_inode) = CURRENT_UTIME;
- mark_inode_dirty(new_inode);
- }
- old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
- UDF_I_UCTIME(old_dir) = UDF_I_UMTIME(old_dir) = CURRENT_UTIME;
- mark_inode_dirty(old_dir);
- if (dir_bh)
- {
- dir_fi->icb.extLocation = lelb_to_cpu(UDF_I_LOCATION(new_dir));
- udf_update_tag((char *)dir_fi, (sizeof(struct FileIdentDesc) +
- cpu_to_le16(dir_fi->lengthOfImpUse) + 3) & ~3);
- if (UDF_I_ALLOCTYPE(old_inode) == ICB_FLAG_AD_IN_ICB)
- {
- mark_inode_dirty(old_inode);
- old_inode->i_version = ++event;
- }
- 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);
- }
- 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,
- };