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/*
* dir.c
*
* PURPOSE
* Directory handling routines for the OSTA-UDF(tm) filesystem.
*
* 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 */
const 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_path.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 *tmp, *bha[16];
kernel_lb_addr eloc;
uint32_t elen;
sector_t offset;
int i, num;
unsigned int dt_type;
struct extent_position epos = { NULL, 0, {0, 0}};
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),
&epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
{
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)
epos.offset -= sizeof(short_ad);
else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
epos.offset -= sizeof(long_ad);
}
else
offset = 0;
if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
{
udf_release_data(epos.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(epos.bh);
return -ENOENT;
}
while ( nf_pos < size )
{
filp->f_pos = nf_pos + 1;
fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc, &elen, &offset);
if (!fi)
{
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
udf_release_data(epos.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_path.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(epos.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(epos.bh);
return 0;
}
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