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marcus.erl |
/*
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* dir.c
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*
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* PURPOSE
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* Directory handling routines for the OSTA-UDF(tm) filesystem.
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*
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* COPYRIGHT
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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*
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* (C) 1998-2004 Ben Fennema
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*
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* HISTORY
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*
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* 10/05/98 dgb Split directory operations into its own file
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* Implemented directory reads via do_udf_readdir
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* 10/06/98 Made directory operations work!
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* 11/17/98 Rewrote directory to support ICBTAG_FLAG_AD_LONG
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* 11/25/98 blf Rewrote directory handling (readdir+lookup) to support reading
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* across blocks.
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* 12/12/98 Split out the lookup code to namei.c. bulk of directory
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* code now in directory.c:udf_fileident_read.
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*/
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#include "udfdecl.h"
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/smp_lock.h>
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#include <linux/buffer_head.h>
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#include "udf_i.h"
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#include "udf_sb.h"
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/* Prototypes for file operations */
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static int udf_readdir(struct file *, void *, filldir_t);
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static int do_udf_readdir(struct inode *, struct file *, filldir_t, void *);
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/* readdir and lookup functions */
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const struct file_operations udf_dir_operations = {
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.read = generic_read_dir,
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.readdir = udf_readdir,
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.ioctl = udf_ioctl,
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.fsync = udf_fsync_file,
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};
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/*
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* udf_readdir
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*
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* PURPOSE
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* Read a directory entry.
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*
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* DESCRIPTION
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* Optional - sys_getdents() will return -ENOTDIR if this routine is not
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* available.
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*
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* Refer to sys_getdents() in fs/readdir.c
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* sys_getdents() -> .
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*
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* PRE-CONDITIONS
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* filp Pointer to directory file.
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* buf Pointer to directory entry buffer.
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* filldir Pointer to filldir function.
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*
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* POST-CONDITIONS
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* <return> >=0 on success.
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*
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* HISTORY
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* July 1, 1997 - Andrew E. Mileski
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* Written, tested, and released.
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*/
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int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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struct inode *dir = filp->f_path.dentry->d_inode;
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int result;
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lock_kernel();
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if (filp->f_pos == 0) {
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if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) {
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unlock_kernel();
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return 0;
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}
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filp->f_pos++;
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}
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result = do_udf_readdir(dir, filp, filldir, dirent);
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unlock_kernel();
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return result;
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}
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static int
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do_udf_readdir(struct inode *dir, struct file *filp, filldir_t filldir,
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void *dirent)
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{
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struct udf_fileident_bh fibh;
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struct fileIdentDesc *fi = NULL;
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struct fileIdentDesc cfi;
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int block, iblock;
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loff_t nf_pos = filp->f_pos - 1;
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int flen;
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char fname[UDF_NAME_LEN];
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char *nameptr;
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uint16_t liu;
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uint8_t lfi;
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loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
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struct buffer_head *tmp, *bha[16];
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kernel_lb_addr eloc;
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uint32_t elen;
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sector_t offset;
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int i, num;
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unsigned int dt_type;
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struct extent_position epos = { NULL, 0, {0, 0} };
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if (nf_pos >= size)
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return 0;
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if (nf_pos == 0)
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nf_pos = (udf_ext0_offset(dir) >> 2);
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fibh.soffset = fibh.eoffset = (nf_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
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if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
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fibh.sbh = fibh.ebh = NULL;
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} else if (inode_bmap(dir, nf_pos >> (dir->i_sb->s_blocksize_bits - 2),
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&epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
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block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
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if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
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if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
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epos.offset -= sizeof(short_ad);
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else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
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epos.offset -= sizeof(long_ad);
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} else {
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offset = 0;
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}
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if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
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brelse(epos.bh);
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return -EIO;
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}
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if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
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i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
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if (i + offset > (elen >> dir->i_sb->s_blocksize_bits))
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i = (elen >> dir->i_sb->s_blocksize_bits) - offset;
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for (num = 0; i > 0; i--) {
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block = udf_get_lb_pblock(dir->i_sb, eloc, offset + i);
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tmp = udf_tgetblk(dir->i_sb, block);
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if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
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bha[num++] = tmp;
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else
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brelse(tmp);
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}
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if (num) {
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ll_rw_block(READA, num, bha);
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for (i = 0; i < num; i++)
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brelse(bha[i]);
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}
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}
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} else {
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brelse(epos.bh);
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return -ENOENT;
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}
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while (nf_pos < size) {
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filp->f_pos = nf_pos + 1;
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fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
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&elen, &offset);
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if (!fi) {
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if (fibh.sbh != fibh.ebh)
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brelse(fibh.ebh);
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brelse(fibh.sbh);
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brelse(epos.bh);
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return 0;
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}
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liu = le16_to_cpu(cfi.lengthOfImpUse);
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lfi = cfi.lengthFileIdent;
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if (fibh.sbh == fibh.ebh) {
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nameptr = fi->fileIdent + liu;
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} else {
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int poffset; /* Unpaded ending offset */
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poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
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if (poffset >= lfi) {
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nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
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} else {
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nameptr = fname;
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memcpy(nameptr, fi->fileIdent + liu,
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lfi - poffset);
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memcpy(nameptr + lfi - poffset,
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fibh.ebh->b_data, poffset);
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}
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}
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if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
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if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
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continue;
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}
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if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
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if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
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continue;
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}
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if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
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iblock = parent_ino(filp->f_path.dentry);
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flen = 2;
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memcpy(fname, "..", flen);
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dt_type = DT_DIR;
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} else {
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kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
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iblock = udf_get_lb_pblock(dir->i_sb, tloc, 0);
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flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
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dt_type = DT_UNKNOWN;
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}
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if (flen) {
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if (filldir(dirent, fname, flen, filp->f_pos, iblock, dt_type) < 0) {
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if (fibh.sbh != fibh.ebh)
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brelse(fibh.ebh);
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brelse(fibh.sbh);
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brelse(epos.bh);
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return 0;
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}
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}
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} /* end while */
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filp->f_pos = nf_pos + 1;
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if (fibh.sbh != fibh.ebh)
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brelse(fibh.ebh);
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brelse(fibh.sbh);
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brelse(epos.bh);
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return 0;
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}
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