269 lines
6.4 KiB
C
269 lines
6.4 KiB
C
/*
|
|
* dir.c
|
|
*
|
|
* PURPOSE
|
|
* Directory 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
|
|
*
|
|
* HISTORY
|
|
*
|
|
* 10/05/98 dgb Split directory operations into its own file
|
|
* Implemented directory reads via do_udf_readdir
|
|
* 10/06/98 Made directory operations work!
|
|
* 11/17/98 Rewrote directory to support ICBTAG_FLAG_AD_LONG
|
|
* 11/25/98 blf Rewrote directory handling (readdir+lookup) to support reading
|
|
* across blocks.
|
|
* 12/12/98 Split out the lookup code to namei.c. bulk of directory
|
|
* code now in directory.c:udf_fileident_read.
|
|
*/
|
|
|
|
#include "udfdecl.h"
|
|
|
|
#include <linux/string.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/buffer_head.h>
|
|
|
|
#include "udf_i.h"
|
|
#include "udf_sb.h"
|
|
|
|
/* Prototypes for file operations */
|
|
static int udf_readdir(struct file *, void *, filldir_t);
|
|
static int do_udf_readdir(struct inode *, struct file *, filldir_t, void *);
|
|
|
|
/* readdir and lookup functions */
|
|
|
|
struct file_operations udf_dir_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = udf_readdir,
|
|
.ioctl = udf_ioctl,
|
|
.fsync = udf_fsync_file,
|
|
};
|
|
|
|
/*
|
|
* udf_readdir
|
|
*
|
|
* PURPOSE
|
|
* Read a directory entry.
|
|
*
|
|
* DESCRIPTION
|
|
* Optional - sys_getdents() will return -ENOTDIR if this routine is not
|
|
* available.
|
|
*
|
|
* Refer to sys_getdents() in fs/readdir.c
|
|
* sys_getdents() -> .
|
|
*
|
|
* PRE-CONDITIONS
|
|
* filp Pointer to directory file.
|
|
* buf Pointer to directory entry buffer.
|
|
* filldir Pointer to filldir function.
|
|
*
|
|
* POST-CONDITIONS
|
|
* <return> >=0 on success.
|
|
*
|
|
* HISTORY
|
|
* July 1, 1997 - Andrew E. Mileski
|
|
* Written, tested, and released.
|
|
*/
|
|
|
|
int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
|
{
|
|
struct inode *dir = filp->f_dentry->d_inode;
|
|
int result;
|
|
|
|
lock_kernel();
|
|
|
|
if ( filp->f_pos == 0 )
|
|
{
|
|
if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0)
|
|
{
|
|
unlock_kernel();
|
|
return 0;
|
|
}
|
|
filp->f_pos ++;
|
|
}
|
|
|
|
result = do_udf_readdir(dir, filp, filldir, dirent);
|
|
unlock_kernel();
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
do_udf_readdir(struct inode * dir, struct file *filp, filldir_t filldir, void *dirent)
|
|
{
|
|
struct udf_fileident_bh fibh;
|
|
struct fileIdentDesc *fi=NULL;
|
|
struct fileIdentDesc cfi;
|
|
int block, iblock;
|
|
loff_t nf_pos = filp->f_pos - 1;
|
|
int flen;
|
|
char fname[UDF_NAME_LEN];
|
|
char *nameptr;
|
|
uint16_t liu;
|
|
uint8_t lfi;
|
|
loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
|
|
struct buffer_head * bh = NULL, * tmp, * bha[16];
|
|
kernel_lb_addr bloc, eloc;
|
|
uint32_t extoffset, elen, offset;
|
|
int i, num;
|
|
unsigned int dt_type;
|
|
|
|
if (nf_pos >= size)
|
|
return 0;
|
|
|
|
if (nf_pos == 0)
|
|
nf_pos = (udf_ext0_offset(dir) >> 2);
|
|
|
|
fibh.soffset = fibh.eoffset = (nf_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, nf_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 -EIO;
|
|
}
|
|
|
|
if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9))-1)))
|
|
{
|
|
i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
|
|
if (i+offset > (elen >> dir->i_sb->s_blocksize_bits))
|
|
i = (elen >> dir->i_sb->s_blocksize_bits)-offset;
|
|
for (num=0; i>0; i--)
|
|
{
|
|
block = udf_get_lb_pblock(dir->i_sb, eloc, offset+i);
|
|
tmp = udf_tgetblk(dir->i_sb, block);
|
|
if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
|
|
bha[num++] = tmp;
|
|
else
|
|
brelse(tmp);
|
|
}
|
|
if (num)
|
|
{
|
|
ll_rw_block(READA, num, bha);
|
|
for (i=0; i<num; i++)
|
|
brelse(bha[i]);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
udf_release_data(bh);
|
|
return -ENOENT;
|
|
}
|
|
|
|
while ( nf_pos < size )
|
|
{
|
|
filp->f_pos = nf_pos + 1;
|
|
|
|
fi = udf_fileident_read(dir, &nf_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;
|
|
}
|
|
|
|
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 ( !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 ( cfi.fileCharacteristics & FID_FILE_CHAR_PARENT )
|
|
{
|
|
iblock = parent_ino(filp->f_dentry);
|
|
flen = 2;
|
|
memcpy(fname, "..", flen);
|
|
dt_type = DT_DIR;
|
|
}
|
|
else
|
|
{
|
|
kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
|
|
|
|
iblock = udf_get_lb_pblock(dir->i_sb, tloc, 0);
|
|
flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
|
|
dt_type = DT_UNKNOWN;
|
|
}
|
|
|
|
if (flen)
|
|
{
|
|
if (filldir(dirent, fname, flen, filp->f_pos, iblock, dt_type) < 0)
|
|
{
|
|
if (fibh.sbh != fibh.ebh)
|
|
udf_release_data(fibh.ebh);
|
|
udf_release_data(fibh.sbh);
|
|
udf_release_data(bh);
|
|
return 0;
|
|
}
|
|
}
|
|
} /* end while */
|
|
|
|
filp->f_pos = nf_pos + 1;
|
|
|
|
if (fibh.sbh != fibh.ebh)
|
|
udf_release_data(fibh.ebh);
|
|
udf_release_data(fibh.sbh);
|
|
udf_release_data(bh);
|
|
|
|
return 0;
|
|
}
|