/*
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/*
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* dir.c
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* dir.c
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*
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*
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* PURPOSE
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* PURPOSE
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* Directory handling routines for the OSTA-UDF(tm) filesystem.
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* Directory handling routines for the OSTA-UDF(tm) filesystem.
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*
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*
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* CONTACTS
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* CONTACTS
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* E-mail regarding any portion of the Linux UDF file system should be
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* E-mail regarding any portion of the Linux UDF file system should be
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* directed to the development team mailing list (run by majordomo):
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* directed to the development team mailing list (run by majordomo):
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* linux_udf@hpesjro.fc.hp.com
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* linux_udf@hpesjro.fc.hp.com
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*
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*
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* COPYRIGHT
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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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* 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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* 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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* 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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* Each contributing author retains all rights to their own work.
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*
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*
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* (C) 1998-2001 Ben Fennema
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* (C) 1998-2001 Ben Fennema
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*
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*
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* HISTORY
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* HISTORY
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*
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*
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* 10/05/98 dgb Split directory operations into it's own file
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* 10/05/98 dgb Split directory operations into it's own file
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* Implemented directory reads via do_udf_readdir
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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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* 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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* 11/17/98 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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* 11/25/98 blf Rewrote directory handling (readdir+lookup) to support reading
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* across blocks.
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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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* 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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* code now in directory.c:udf_fileident_read.
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*/
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*/
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#include "udfdecl.h"
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#include "udfdecl.h"
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/slab.h>
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#include "udf_i.h"
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#include "udf_i.h"
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#include "udf_sb.h"
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#include "udf_sb.h"
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/* Prototypes for file operations */
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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 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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static int do_udf_readdir(struct inode *, struct file *, filldir_t, void *);
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|
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/* readdir and lookup functions */
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/* readdir and lookup functions */
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|
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struct file_operations udf_dir_operations = {
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struct file_operations udf_dir_operations = {
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read: generic_read_dir,
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read: generic_read_dir,
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readdir: udf_readdir,
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readdir: udf_readdir,
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ioctl: udf_ioctl,
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ioctl: udf_ioctl,
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fsync: udf_fsync_file,
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fsync: udf_fsync_file,
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};
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};
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|
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/*
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/*
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* udf_readdir
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* udf_readdir
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*
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*
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* PURPOSE
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* PURPOSE
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* Read a directory entry.
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* Read a directory entry.
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*
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*
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* DESCRIPTION
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* DESCRIPTION
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* Optional - sys_getdents() will return -ENOTDIR if this routine is not
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* Optional - sys_getdents() will return -ENOTDIR if this routine is not
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* available.
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* available.
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*
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*
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* Refer to sys_getdents() in fs/readdir.c
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* Refer to sys_getdents() in fs/readdir.c
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* sys_getdents() -> .
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* sys_getdents() -> .
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*
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*
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* PRE-CONDITIONS
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* PRE-CONDITIONS
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* filp Pointer to directory file.
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* filp Pointer to directory file.
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* buf Pointer to directory entry buffer.
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* buf Pointer to directory entry buffer.
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* filldir Pointer to filldir function.
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* filldir Pointer to filldir function.
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*
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*
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* POST-CONDITIONS
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* POST-CONDITIONS
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* <return> >=0 on success.
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* <return> >=0 on success.
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*
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*
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* HISTORY
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* HISTORY
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* July 1, 1997 - Andrew E. Mileski
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* July 1, 1997 - Andrew E. Mileski
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* Written, tested, and released.
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* Written, tested, and released.
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*/
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*/
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|
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int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
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int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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{
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struct inode *dir = filp->f_dentry->d_inode;
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struct inode *dir = filp->f_dentry->d_inode;
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int result;
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int result;
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|
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if ( filp->f_pos == 0 )
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if ( filp->f_pos == 0 )
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{
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{
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if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0)
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if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0)
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return 0;
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return 0;
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filp->f_pos ++;
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filp->f_pos ++;
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}
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}
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|
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result = do_udf_readdir(dir, filp, filldir, dirent);
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result = do_udf_readdir(dir, filp, filldir, dirent);
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UPDATE_ATIME(dir);
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UPDATE_ATIME(dir);
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return result;
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return result;
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}
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}
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|
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static int
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static int
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do_udf_readdir(struct inode * dir, struct file *filp, filldir_t filldir, void *dirent)
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do_udf_readdir(struct inode * dir, struct file *filp, filldir_t filldir, void *dirent)
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{
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{
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struct udf_fileident_bh fibh;
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struct udf_fileident_bh fibh;
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struct fileIdentDesc *fi=NULL;
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struct fileIdentDesc *fi=NULL;
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struct fileIdentDesc cfi;
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struct fileIdentDesc cfi;
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int block, iblock;
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int block, iblock;
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loff_t nf_pos = filp->f_pos - 1;
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loff_t nf_pos = filp->f_pos - 1;
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int flen;
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int flen;
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char fname[255];
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char fname[255];
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char *nameptr;
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char *nameptr;
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uint16_t liu;
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uint16_t liu;
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uint8_t lfi;
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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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loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
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struct buffer_head * bh = NULL, * tmp, * bha[16];
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struct buffer_head * bh = NULL, * tmp, * bha[16];
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lb_addr bloc, eloc;
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lb_addr bloc, eloc;
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uint32_t extoffset, elen, offset;
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uint32_t extoffset, elen, offset;
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int i, num;
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int i, num;
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unsigned int dt_type;
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unsigned int dt_type;
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|
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if (nf_pos >= size)
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if (nf_pos >= size)
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return 0;
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return 0;
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|
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if (nf_pos == 0)
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if (nf_pos == 0)
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nf_pos = (udf_ext0_offset(dir) >> 2);
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nf_pos = (udf_ext0_offset(dir) >> 2);
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|
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fibh.soffset = fibh.eoffset = (nf_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
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fibh.soffset = fibh.eoffset = (nf_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
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if (inode_bmap(dir, nf_pos >> (dir->i_sb->s_blocksize_bits - 2),
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if (inode_bmap(dir, nf_pos >> (dir->i_sb->s_blocksize_bits - 2),
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&bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
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&bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
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{
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{
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offset >>= dir->i_sb->s_blocksize_bits;
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offset >>= dir->i_sb->s_blocksize_bits;
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block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
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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 ((++offset << dir->i_sb->s_blocksize_bits) < elen)
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{
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{
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if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
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if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
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extoffset -= sizeof(short_ad);
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extoffset -= sizeof(short_ad);
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else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
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else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
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extoffset -= sizeof(long_ad);
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extoffset -= sizeof(long_ad);
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}
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}
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else
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else
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offset = 0;
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offset = 0;
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}
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}
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else
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else
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{
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{
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udf_release_data(bh);
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udf_release_data(bh);
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return -ENOENT;
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return -ENOENT;
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}
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}
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|
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if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
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if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
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{
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{
|
udf_release_data(bh);
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udf_release_data(bh);
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return -EIO;
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return -EIO;
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}
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}
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|
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if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9))-1)))
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if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9))-1)))
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{
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{
|
i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
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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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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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i = (elen >> dir->i_sb->s_blocksize_bits)-offset;
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for (num=0; i>0; i--)
|
for (num=0; i>0; i--)
|
{
|
{
|
block = udf_get_lb_pblock(dir->i_sb, eloc, offset+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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tmp = udf_tgetblk(dir->i_sb, block);
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if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
|
if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
|
bha[num++] = tmp;
|
bha[num++] = tmp;
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else
|
else
|
brelse(tmp);
|
brelse(tmp);
|
}
|
}
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if (num)
|
if (num)
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{
|
{
|
ll_rw_block(READA, num, bha);
|
ll_rw_block(READA, num, bha);
|
for (i=0; i<num; i++)
|
for (i=0; i<num; i++)
|
brelse(bha[i]);
|
brelse(bha[i]);
|
}
|
}
|
}
|
}
|
|
|
while ( nf_pos < size )
|
while ( nf_pos < size )
|
{
|
{
|
filp->f_pos = nf_pos + 1;
|
filp->f_pos = nf_pos + 1;
|
|
|
fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
|
fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
|
|
|
if (!fi)
|
if (!fi)
|
{
|
{
|
if (fibh.sbh != fibh.ebh)
|
if (fibh.sbh != fibh.ebh)
|
udf_release_data(fibh.ebh);
|
udf_release_data(fibh.ebh);
|
udf_release_data(fibh.sbh);
|
udf_release_data(fibh.sbh);
|
udf_release_data(bh);
|
udf_release_data(bh);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
liu = le16_to_cpu(cfi.lengthOfImpUse);
|
liu = le16_to_cpu(cfi.lengthOfImpUse);
|
lfi = cfi.lengthFileIdent;
|
lfi = cfi.lengthFileIdent;
|
|
|
if (fibh.sbh == fibh.ebh)
|
if (fibh.sbh == fibh.ebh)
|
nameptr = fi->fileIdent + liu;
|
nameptr = fi->fileIdent + liu;
|
else
|
else
|
{
|
{
|
int poffset; /* Unpaded ending offset */
|
int poffset; /* Unpaded ending offset */
|
|
|
poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
|
poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
|
|
|
if (poffset >= lfi)
|
if (poffset >= lfi)
|
nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
|
nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
|
else
|
else
|
{
|
{
|
nameptr = fname;
|
nameptr = fname;
|
memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
|
memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
|
memcpy(nameptr + lfi - poffset, fibh.ebh->b_data, poffset);
|
memcpy(nameptr + lfi - poffset, fibh.ebh->b_data, poffset);
|
}
|
}
|
}
|
}
|
|
|
if ( (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
|
if ( (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
|
{
|
{
|
if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) )
|
if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) )
|
continue;
|
continue;
|
}
|
}
|
|
|
if ( (cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 )
|
if ( (cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 )
|
{
|
{
|
if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) )
|
if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) )
|
continue;
|
continue;
|
}
|
}
|
|
|
if ( cfi.fileCharacteristics & FID_FILE_CHAR_PARENT )
|
if ( cfi.fileCharacteristics & FID_FILE_CHAR_PARENT )
|
{
|
{
|
iblock = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(filp->f_dentry->d_parent->d_inode), 0);
|
iblock = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(filp->f_dentry->d_parent->d_inode), 0);
|
flen = 2;
|
flen = 2;
|
memcpy(fname, "..", flen);
|
memcpy(fname, "..", flen);
|
dt_type = DT_DIR;
|
dt_type = DT_DIR;
|
}
|
}
|
else
|
else
|
{
|
{
|
iblock = udf_get_lb_pblock(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation), 0);
|
iblock = udf_get_lb_pblock(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation), 0);
|
flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
|
flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
|
dt_type = DT_UNKNOWN;
|
dt_type = DT_UNKNOWN;
|
}
|
}
|
|
|
if (flen)
|
if (flen)
|
{
|
{
|
if (filldir(dirent, fname, flen, filp->f_pos, iblock, dt_type) < 0)
|
if (filldir(dirent, fname, flen, filp->f_pos, iblock, dt_type) < 0)
|
{
|
{
|
if (fibh.sbh != fibh.ebh)
|
if (fibh.sbh != fibh.ebh)
|
udf_release_data(fibh.ebh);
|
udf_release_data(fibh.ebh);
|
udf_release_data(fibh.sbh);
|
udf_release_data(fibh.sbh);
|
udf_release_data(bh);
|
udf_release_data(bh);
|
return 0;
|
return 0;
|
}
|
}
|
}
|
}
|
} /* end while */
|
} /* end while */
|
|
|
filp->f_pos = nf_pos + 1;
|
filp->f_pos = nf_pos + 1;
|
|
|
if (fibh.sbh != fibh.ebh)
|
if (fibh.sbh != fibh.ebh)
|
udf_release_data(fibh.ebh);
|
udf_release_data(fibh.ebh);
|
udf_release_data(fibh.sbh);
|
udf_release_data(fibh.sbh);
|
udf_release_data(bh);
|
udf_release_data(bh);
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
