Release 4.10 fs/udf/dir.c

Directory: fs/udf
/*
 * 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/bio.h>

#include "udf_i.h"
#include "udf_sb.h"




static int udf_readdir(struct file *file, struct dir_context *ctx)
{
	struct inode *dir = file_inode(file);
	struct udf_inode_info *iinfo = UDF_I(dir);
	struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
	struct fileIdentDesc *fi = NULL;
	struct fileIdentDesc cfi;
	int block, iblock;
	loff_t nf_pos;
	int flen;
	unsigned char *fname = NULL, *copy_name = NULL;
	unsigned char *nameptr;
	uint16_t liu;
	uint8_t lfi;
	loff_t size = udf_ext0_offset(dir) + dir->i_size;
	struct buffer_head *tmp, *bha[16];
	struct kernel_lb_addr eloc;
	uint32_t elen;
	sector_t offset;
	int i, num, ret = 0;
	struct extent_position epos = { NULL, 0, {0, 0} };
	struct super_block *sb = dir->i_sb;

	if (ctx->pos == 0) {
		if (!dir_emit_dot(file, ctx))
			return 0;
		ctx->pos = 1;
	}
	nf_pos = (ctx->pos - 1) << 2;
	if (nf_pos >= size)
		goto out;

	fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
	if (!fname) {
		ret = -ENOMEM;
		goto out;
	}

	if (nf_pos == 0)
		nf_pos = udf_ext0_offset(dir);

	fibh.soffset = fibh.eoffset = nf_pos & (sb->s_blocksize - 1);
	if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
		if (inode_bmap(dir, nf_pos >> sb->s_blocksize_bits,
		    &epos, &eloc, &elen, &offset)
		    != (EXT_RECORDED_ALLOCATED >> 30)) {
			ret = -ENOENT;
			goto out;
		}
		block = udf_get_lb_pblock(sb, &eloc, offset);
		if ((++offset << sb->s_blocksize_bits) < elen) {
			if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
				epos.offset -= sizeof(struct short_ad);
			else if (iinfo->i_alloc_type ==
					ICBTAG_FLAG_AD_LONG)
				epos.offset -= sizeof(struct long_ad);
		} else {
			offset = 0;
		}

		if (!(fibh.sbh = fibh.ebh = udf_tread(sb, block))) {
			ret = -EIO;
			goto out;
		}

		if (!(offset & ((16 >> (sb->s_blocksize_bits - 9)) - 1))) {
			i = 16 >> (sb->s_blocksize_bits - 9);
			if (i + offset > (elen >> sb->s_blocksize_bits))
				i = (elen >> sb->s_blocksize_bits) - offset;
			for (num = 0; i > 0; i--) {
				block = udf_get_lb_pblock(sb, &eloc, offset + i);
				tmp = udf_tgetblk(sb, block);
				if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
					bha[num++] = tmp;
				else
					brelse(tmp);
			}
			if (num) {
				ll_rw_block(REQ_OP_READ, REQ_RAHEAD, num, bha);
				for (i = 0; i < num; i++)
					brelse(bha[i]);
			}
		}
	}

	while (nf_pos < size) {
		struct kernel_lb_addr tloc;

		ctx->pos = (nf_pos >> 2) + 1;

		fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
					&elen, &offset);
		if (!fi)
			goto out;

		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 {
				if (!copy_name) {
					copy_name = kmalloc(UDF_NAME_LEN,
							    GFP_NOFS);
					if (!copy_name) {
						ret = -ENOMEM;
						goto out;
					}
				}
				nameptr = copy_name;
				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(sb, UDF_FLAG_UNDELETE))
				continue;
		}

		if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
			if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
				continue;
		}

		if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
			if (!dir_emit_dotdot(file, ctx))
				goto out;
			continue;
		}

		flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
		if (flen < 0)
			continue;

		tloc = lelb_to_cpu(cfi.icb.extLocation);
		iblock = udf_get_lb_pblock(sb, &tloc, 0);
		if (!dir_emit(ctx, fname, flen, iblock, DT_UNKNOWN))
			goto out;
	} /* end while */

	ctx->pos = (nf_pos >> 2) + 1;

out:
	if (fibh.sbh != fibh.ebh)
		brelse(fibh.ebh);
	brelse(fibh.sbh);
	brelse(epos.bh);
	kfree(fname);
	kfree(copy_name);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 451 45.05% 6 20.00%
linus torvalds linus torvalds 203 20.28% 1 3.33%
jan kara jan kara 185 18.48% 8 26.67%
al viro al viro 105 10.49% 3 10.00%
ben fennema ben fennema 21 2.10% 2 6.67%
marcin slusarz marcin slusarz 11 1.10% 2 6.67%
mika kukkonen mika kukkonen 7 0.70% 1 3.33%
cyrill gorcunov cyrill gorcunov 7 0.70% 1 3.33%
pekka j enberg pekka j enberg 6 0.60% 2 6.67%
fabian frederick fabian frederick 2 0.20% 2 6.67%
michael christie michael christie 2 0.20% 1 3.33%
christoph hellwig christoph hellwig 1 0.10% 1 3.33%
Total 1001 100.00% 30 100.00%

/* readdir and lookup functions */

const struct file_operations udf_dir_operations = {
	.llseek			= generic_file_llseek,
	.read			= generic_read_dir,
	.iterate_shared		= udf_readdir,
	.unlocked_ioctl		= udf_ioctl,
	.fsync			= generic_file_fsync,
};
Overall Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 467 44.10% 6 15.79%
linus torvalds linus torvalds 204 19.26% 2 5.26%
jan kara jan kara 185 17.47% 8 21.05%
al viro al viro 106 10.01% 4 10.53%
marcin slusarz marcin slusarz 36 3.40% 3 7.89%
ben fennema ben fennema 25 2.36% 2 5.26%
cyrill gorcunov cyrill gorcunov 7 0.66% 1 2.63%
mika kukkonen mika kukkonen 7 0.66% 1 2.63%
pekka j enberg pekka j enberg 6 0.57% 2 5.26%
christoph hellwig christoph hellwig 5 0.47% 3 7.89%
jan blunck jan blunck 5 0.47% 1 2.63%
michael christie michael christie 2 0.19% 1 2.63%
fabian frederick fabian frederick 2 0.19% 2 5.26%
adrian bunk adrian bunk 1 0.09% 1 2.63%
john kacur john kacur 1 0.09% 1 2.63%
Total 1059 100.00% 38 100.00%
Directory: fs/udf

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
pre-git	pre-git	451	45.05%	6	20.00%
linus torvalds	linus torvalds	203	20.28%	1	3.33%
jan kara	jan kara	185	18.48%	8	26.67%
al viro	al viro	105	10.49%	3	10.00%
ben fennema	ben fennema	21	2.10%	2	6.67%
marcin slusarz	marcin slusarz	11	1.10%	2	6.67%
mika kukkonen	mika kukkonen	7	0.70%	1	3.33%
cyrill gorcunov	cyrill gorcunov	7	0.70%	1	3.33%
pekka j enberg	pekka j enberg	6	0.60%	2	6.67%
fabian frederick	fabian frederick	2	0.20%	2	6.67%
michael christie	michael christie	2	0.20%	1	3.33%
christoph hellwig	christoph hellwig	1	0.10%	1	3.33%
	Total	1001	100.00%	30	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 fs/udf/dir.c

Contributors

Overall Contributors
