cregit-Linux how code gets into the kernel

Release 4.10 fs/ocfs2/dir.c

Directory: fs/ocfs2
/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * dir.c
 *
 * Creates, reads, walks and deletes directory-nodes
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 *
 *  Portions of this code from linux/fs/ext3/dir.c
 *
 *  Copyright (C) 1992, 1993, 1994, 1995
 *  Remy Card (card@masi.ibp.fr)
 *  Laboratoire MASI - Institut Blaise pascal
 *  Universite Pierre et Marie Curie (Paris VI)
 *
 *   from
 *
 *   linux/fs/minix/dir.c
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/quotaops.h>
#include <linux/sort.h>

#include <cluster/masklog.h>

#include "ocfs2.h"

#include "alloc.h"
#include "blockcheck.h"
#include "dir.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "file.h"
#include "inode.h"
#include "journal.h"
#include "namei.h"
#include "suballoc.h"
#include "super.h"
#include "sysfile.h"
#include "uptodate.h"
#include "ocfs2_trace.h"

#include "buffer_head_io.h"


#define NAMEI_RA_CHUNKS  2

#define NAMEI_RA_BLOCKS  4

#define NAMEI_RA_SIZE        (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)


static unsigned char ocfs2_filetype_table[] = {
	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
};

static int ocfs2_do_extend_dir(struct super_block *sb,
			       handle_t *handle,
			       struct inode *dir,
			       struct buffer_head *parent_fe_bh,
			       struct ocfs2_alloc_context *data_ac,
			       struct ocfs2_alloc_context *meta_ac,
			       struct buffer_head **new_bh);
static int ocfs2_dir_indexed(struct inode *inode);

/*
 * These are distinct checks because future versions of the file system will
 * want to have a trailing dirent structure independent of indexing.
 */



static int ocfs2_supports_dir_trailer(struct inode *dir)
{
	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);

	if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
		return 0;

	return ocfs2_meta_ecc(osb) || ocfs2_dir_indexed(dir);
}


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/*
 * "new' here refers to the point at which we're creating a new
 * directory via "mkdir()", but also when we're expanding an inline
 * directory. In either case, we don't yet have the indexing bit set
 * on the directory, so the standard checks will fail in when metaecc
 * is turned off. Only directory-initialization type functions should
 * use this then. Everything else wants ocfs2_supports_dir_trailer()
 */



static int ocfs2_new_dir_wants_trailer(struct inode *dir)
{
	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);

	return ocfs2_meta_ecc(osb) ||
		ocfs2_supports_indexed_dirs(osb);
}


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static inline unsigned int ocfs2_dir_trailer_blk_off(struct super_block *sb)
{
	return sb->s_blocksize - sizeof(struct ocfs2_dir_block_trailer);
}


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#define ocfs2_trailer_from_bh(_bh, _sb) ((struct ocfs2_dir_block_trailer *) ((_bh)->b_data + ocfs2_dir_trailer_blk_off((_sb))))

/* XXX ocfs2_block_dqtrailer() is similar but not quite - can we make
 * them more consistent? */



struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
							    void *data)
{
	char *p = data;

	p += blocksize - sizeof(struct ocfs2_dir_block_trailer);
	return (struct ocfs2_dir_block_trailer *)p;
}


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/*
 * XXX: This is executed once on every dirent. We should consider optimizing
 * it.
 */



static int ocfs2_skip_dir_trailer(struct inode *dir,
				  struct ocfs2_dir_entry *de,
				  unsigned long offset,
				  unsigned long blklen)
{
	unsigned long toff = blklen - sizeof(struct ocfs2_dir_block_trailer);

	if (!ocfs2_supports_dir_trailer(dir))
		return 0;

	if (offset != toff)
		return 0;

	return 1;
}


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static void ocfs2_init_dir_trailer(struct inode *inode,
				   struct buffer_head *bh, u16 rec_len)
{
	struct ocfs2_dir_block_trailer *trailer;

	trailer = ocfs2_trailer_from_bh(bh, inode->i_sb);
	strcpy(trailer->db_signature, OCFS2_DIR_TRAILER_SIGNATURE);
	trailer->db_compat_rec_len =
			cpu_to_le16(sizeof(struct ocfs2_dir_block_trailer));
	trailer->db_parent_dinode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
	trailer->db_blkno = cpu_to_le64(bh->b_blocknr);
	trailer->db_free_rec_len = cpu_to_le16(rec_len);
}

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/*
 * Link an unindexed block with a dir trailer structure into the index free
 * list. This function will modify dirdata_bh, but assumes you've already
 * passed it to the journal.
 */



static int ocfs2_dx_dir_link_trailer(struct inode *dir, handle_t *handle,
				     struct buffer_head *dx_root_bh,
				     struct buffer_head *dirdata_bh)
{
	int ret;
	struct ocfs2_dx_root_block *dx_root;
	struct ocfs2_dir_block_trailer *trailer;

	ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret) {
		mlog_errno(ret);
		goto out;
	}
	trailer = ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb);
	dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;

	trailer->db_free_next = dx_root->dr_free_blk;
	dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr);

	ocfs2_journal_dirty(handle, dx_root_bh);

out:
	return ret;
}


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static int ocfs2_free_list_at_root(struct ocfs2_dir_lookup_result *res)
{
	return res->dl_prev_leaf_bh == NULL;
}


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void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res)
{
	brelse(res->dl_dx_root_bh);
	brelse(res->dl_leaf_bh);
	brelse(res->dl_dx_leaf_bh);
	brelse(res->dl_prev_leaf_bh);
}


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static int ocfs2_dir_indexed(struct inode *inode)
{
	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INDEXED_DIR_FL)
		return 1;
	return 0;
}


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static inline int ocfs2_dx_root_inline(struct ocfs2_dx_root_block *dx_root)
{
	return dx_root->dr_flags & OCFS2_DX_FLAG_INLINE;
}


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/*
 * Hashing code adapted from ext3
 */

#define DELTA 0x9E3779B9




static void TEA_transform(__u32 buf[4], __u32 const in[])
{
	__u32	sum = 0;
	__u32	b0 = buf[0], b1 = buf[1];
	__u32	a = in[0], b = in[1], c = in[2], d = in[3];
	int	n = 16;

	do {
		sum += DELTA;
		b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b);
		b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d);
	} while (--n);

	buf[0] += b0;
	buf[1] += b1;
}


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static void str2hashbuf(const char *msg, int len, __u32 *buf, int num)
{
	__u32	pad, val;
	int	i;

	pad = (__u32)len | ((__u32)len << 8);
	pad |= pad << 16;

	val = pad;
	if (len > num*4)
		len = num * 4;
	for (i = 0; i < len; i++) {
		if ((i % 4) == 0)
			val = pad;
		val = msg[i] + (val << 8);
		if ((i % 4) == 3) {
			*buf++ = val;
			val = pad;
			num--;
		}
	}
	if (--num >= 0)
		*buf++ = val;
	while (--num >= 0)
		*buf++ = pad;
}


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static void ocfs2_dx_dir_name_hash(struct inode *dir, const char *name, int len,
				   struct ocfs2_dx_hinfo *hinfo)
{
	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
	const char	*p;
	__u32		in[8], buf[4];

	/*
         * XXX: Is this really necessary, if the index is never looked
         * at by readdir? Is a hash value of '0' a bad idea?
         */
	if ((len == 1 && !strncmp(".", name, 1)) ||
	    (len == 2 && !strncmp("..", name, 2))) {
		buf[0] = buf[1] = 0;
		goto out;
	}

#ifdef OCFS2_DEBUG_DX_DIRS
	/*
         * This makes it very easy to debug indexing problems. We
         * should never allow this to be selected without hand editing
         * this file though.
         */
	buf[0] = buf[1] = len;
	goto out;
#endif

	memcpy(buf, osb->osb_dx_seed, sizeof(buf));

	p = name;
	while (len > 0) {
		str2hashbuf(p, len, in, 4);
		TEA_transform(buf, in);
		len -= 16;
		p += 16;
	}

out:
	hinfo->major_hash = buf[0];
	hinfo->minor_hash = buf[1];
}


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/*
 * bh passed here can be an inode block or a dir data block, depending
 * on the inode inline data flag.
 */



static int ocfs2_check_dir_entry(struct inode * dir,
				 struct ocfs2_dir_entry * de,
				 struct buffer_head * bh,
				 unsigned long offset)
{
	const char *error_msg = NULL;
	const int rlen = le16_to_cpu(de->rec_len);

	if (unlikely(rlen < OCFS2_DIR_REC_LEN(1)))
		error_msg = "rec_len is smaller than minimal";
	else if (unlikely(rlen % 4 != 0))
		error_msg = "rec_len % 4 != 0";
	else if (unlikely(rlen < OCFS2_DIR_REC_LEN(de->name_len)))
		error_msg = "rec_len is too small for name_len";
	else if (unlikely(
		 ((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize))
		error_msg = "directory entry across blocks";

	if (unlikely(error_msg != NULL))
		mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
		     "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
		     (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
		     offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
		     de->name_len);

	return error_msg == NULL ? 1 : 0;
}


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static inline int ocfs2_match(int len,
			      const char * const name,
			      struct ocfs2_dir_entry *de)
{
	if (len != de->name_len)
		return 0;
	if (!de->inode)
		return 0;
	return !memcmp(name, de->name, len);
}


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/*
 * Returns 0 if not found, -1 on failure, and 1 on success
 */



static inline int ocfs2_search_dirblock(struct buffer_head *bh,
					struct inode *dir,
					const char *name, int namelen,
					unsigned long offset,
					char *first_de,
					unsigned int bytes,
					struct ocfs2_dir_entry **res_dir)
{
	struct ocfs2_dir_entry *de;
	char *dlimit, *de_buf;
	int de_len;
	int ret = 0;

	de_buf = first_de;
	dlimit = de_buf + bytes;

	while (de_buf < dlimit) {
		/* this code is executed quadratically often */
		/* do minimal checking `by hand' */

		de = (struct ocfs2_dir_entry *) de_buf;

		if (de_buf + namelen <= dlimit &&
		    ocfs2_match(namelen, name, de)) {
			/* found a match - just to be sure, do a full check */
			if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
				ret = -1;
				goto bail;
			}
			*res_dir = de;
			ret = 1;
			goto bail;
		}

		/* prevent looping on a bad block */
		de_len = le16_to_cpu(de->rec_len);
		if (de_len <= 0) {
			ret = -1;
			goto bail;
		}

		de_buf += de_len;
		offset += de_len;
	}

bail:
	trace_ocfs2_search_dirblock(ret);
	return ret;
}


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static struct buffer_head *ocfs2_find_entry_id(const char *name,
					       int namelen,
					       struct inode *dir,
					       struct ocfs2_dir_entry **res_dir)
{
	int ret, found;
	struct buffer_head *di_bh = NULL;
	struct ocfs2_dinode *di;
	struct ocfs2_inline_data *data;

	ret = ocfs2_read_inode_block(dir, &di_bh);
	if (ret) {
		mlog_errno(ret);
		goto out;
	}

	di = (struct ocfs2_dinode *)di_bh->b_data;
	data = &di->id2.i_data;

	found = ocfs2_search_dirblock(di_bh, dir, name, namelen, 0,
				      data->id_data, i_size_read(dir), res_dir);
	if (found == 1)
		return di_bh;

	brelse(di_bh);
out:
	return NULL;
}


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static int ocfs2_validate_dir_block(struct super_block *sb,
				    struct buffer_head *bh)
{
	int rc;
	struct ocfs2_dir_block_trailer *trailer =
		ocfs2_trailer_from_bh(bh, sb);


	/*
         * We don't validate dirents here, that's handled
         * in-place when the code walks them.
         */
	trace_ocfs2_validate_dir_block((unsigned long long)bh->b_blocknr);

	BUG_ON(!buffer_uptodate(bh));

	/*
         * If the ecc fails, we return the error but otherwise
         * leave the filesystem running.  We know any error is
         * local to this block.
         *
         * Note that we are safe to call this even if the directory
         * doesn't have a trailer.  Filesystems without metaecc will do
         * nothing, and filesystems with it will have one.
         */
	rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &trailer->db_check);
	if (rc)
		mlog(ML_ERROR, "Checksum failed for dinode %llu\n",
		     (unsigned long long)bh->b_blocknr);

	return rc;
}


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/*
 * Validate a directory trailer.
 *
 * We check the trailer here rather than in ocfs2_validate_dir_block()
 * because that function doesn't have the inode to test.
 */



static int ocfs2_check_dir_trailer(struct inode *dir, struct buffer_head *bh)
{
	int rc = 0;
	struct ocfs2_dir_block_trailer *trailer;

	trailer = ocfs2_trailer_from_bh(bh, dir->i_sb);
	if (!OCFS2_IS_VALID_DIR_TRAILER(trailer)) {
		rc = ocfs2_error(dir->i_sb,
				 "Invalid dirblock #%llu: signature = %.*s\n",
				 (unsigned long long)bh->b_blocknr, 7,
				 trailer->db_signature);
		goto out;
	}
	if (le64_to_cpu(trailer->db_blkno) != bh->b_blocknr) {
		rc = ocfs2_error(dir->i_sb,
				 "Directory block #%llu has an invalid db_blkno of %llu\n",
				 (unsigned long long)bh->b_blocknr,
				 (unsigned long long)le64_to_cpu(trailer->db_blkno));
		goto out;
	}
	if (le64_to_cpu(trailer->db_parent_dinode) !=
	    OCFS2_I(dir)->ip_blkno) {
		rc = ocfs2_error(dir->i_sb,
				 "Directory block #%llu on dinode #%llu has an invalid parent_dinode of %llu\n",
				 (unsigned long long)bh->b_blocknr,
				 (unsigned long long)OCFS2_I(dir)->ip_blkno,
				 (unsigned long long)le64_to_cpu(trailer->db_blkno));
		goto out;
	}
out:
	return rc;
}


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/*
 * This function forces all errors to -EIO for consistency with its
 * predecessor, ocfs2_bread().  We haven't audited what returning the
 * real error codes would do to callers.  We log the real codes with
 * mlog_errno() before we squash them.
 */



static int ocfs2_read_dir_block(struct inode *inode, u64 v_block,
				struct buffer_head **bh, int flags)
{
	int rc = 0;
	struct buffer_head *tmp = *bh;

	rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, flags,
				    ocfs2_validate_dir_block);
	if (rc) {
		mlog_errno(rc);
		goto out;
	}

	if (!(flags & OCFS2_BH_READAHEAD) &&
	    ocfs2_supports_dir_trailer(inode)) {
		rc = ocfs2_check_dir_trailer(inode, tmp);
		if (rc) {
			if (!*bh)
				brelse(tmp);
			mlog_errno(rc);
			goto out;
		}
	}

	/* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
	if (!*bh)
		*bh = tmp;

out:
	return rc ? -EIO : 0;
}


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/*
 * Read the block at 'phys' which belongs to this directory
 * inode. This function does no virtual->physical block translation -
 * what's passed in is assumed to be a valid directory block.
 */



static int ocfs2_read_dir_block_direct(struct inode *dir, u64 phys,
				       struct buffer_head **bh)
{
	int ret;
	struct buffer_head *tmp = *bh;

	ret = ocfs2_read_block(INODE_CACHE(dir), phys, &tmp,
			       ocfs2_validate_dir_block);
	if (ret) {
		mlog_errno(ret);
		goto out;
	}

	if (ocfs2_supports_dir_trailer(dir)) {
		ret = ocfs2_check_dir_trailer(dir, tmp);
		if (ret) {
			if (!*bh)
				brelse(tmp);
			mlog_errno(ret);
			goto out;
		}
	}

	if (!ret && !*bh)
		*bh = tmp;
out:
	return ret;
}


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static int ocfs2_validate_dx_root(struct super_block *sb,
				  struct buffer_head *bh)
{
	int ret;
	struct ocfs2_dx_root_block *dx_root;

	BUG_ON(!buffer_uptodate(bh));

	dx_root = (struct ocfs2_dx_root_block *) bh->b_data;

	ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_root->dr_check);
	if (ret) {
		mlog(ML_ERROR,
		     "Checksum failed for dir index root block %llu\n",
		     (unsigned long long)bh->b_blocknr);
		return ret;
	}

	if (!OCFS2_IS_VALID_DX_ROOT(dx_root)) {
		ret = ocfs2_error(sb,
				  "Dir Index Root # %llu has bad signature %.*s\n",
				  (unsigned long long)le64_to_cpu(dx_root->dr_blkno),
				  7, dx_root->dr_signature);
	}

	return ret;
}


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static int ocfs2_read_dx_root(struct inode *dir, struct ocfs2_dinode *di,
			      struct buffer_head **dx_root_bh)
{
	int ret;
	u64 blkno = le64_to_cpu(di->i_dx_root);
	struct buffer_head *tmp = *dx_root_bh;

	ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp,
			       ocfs2_validate_dx_root);

	/* If ocfs2_read_block() got us a new bh, pass it up. */
	if (!ret && !*dx_root_bh)
		*dx_root_bh = tmp;

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
mark fashehmark fasheh7596.15%375.00%


joel beckerjoel becker33.85%125.00%


Total78100.00%4100.00%






static int ocfs2_validate_dx_leaf(struct super_block *sb,
				  struct buffer_head *bh)
{
	int ret;
	struct ocfs2_dx_leaf *dx_leaf = (struct ocfs2_dx_leaf *)bh->b_data;

	BUG_ON(!buffer_uptodate(bh));

	ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_leaf->dl_check);
	if (ret) {
		mlog(ML_ERROR,
		     "Checksum failed for dir index leaf block %llu\n",
		     (unsigned long long)bh->b_blocknr);
		return ret;
	}

	if (!OCFS2_IS_VALID_DX_LEAF(dx_leaf)) {
		ret = ocfs2_error(sb, "Dir Index Leaf has bad signature %.*s\n",
				  7, dx_leaf->dl_signature);
	}

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
mark fashehmark fasheh10796.40%466.67%


goldwyn rodriguesgoldwyn rodrigues32.70%116.67%


joe perchesjoe perches10.90%116.67%


Total111100.00%6100.00%






static int ocfs2_read_dx_leaf(struct inode *dir, u64 blkno,
			      struct buffer_head **dx_leaf_bh)
{
	int ret;
	struct buffer_head *tmp = *dx_leaf_bh;

	ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp,
			       ocfs2_validate_dx_leaf);

	/* If ocfs2_read_block() got us a new bh, pass it up. */
	if (!ret && !*dx_leaf_bh)
		*dx_leaf_bh = tmp;

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
mark fashehmark fasheh6395.45%266.67%


joel beckerjoel becker34.55%133.33%


Total66100.00%3100.00%



/*
 * Read a series of dx_leaf blocks. This expects all buffer_head
 * pointers to be NULL on function entry.
 */



static int ocfs2_read_dx_leaves(struct inode *dir, u64 start, int num,
				struct buffer_head **dx_leaf_bhs)
{
	int ret;

	ret = ocfs2_read_blocks(INODE_CACHE(dir), start, num, dx_leaf_bhs, 0,
				ocfs2_validate_dx_leaf);
	if (ret)
		mlog_errno(ret);

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
mark fashehmark fasheh5594.83%266.67%


joel beckerjoel becker35.17%133.33%


Total58100.00%3100.00%






static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen,
					       struct inode *dir,
					       struct ocfs2_dir_entry **res_dir)
{
	struct super_block *sb;
	struct buffer_head *bh_use[NAMEI_RA_SIZE];
	struct buffer_head *bh, *ret = NULL;
	unsigned long start, block, b;
	int ra_max = 0;		/* Number of bh's in the readahead
                                   buffer, bh_use[] */
	int ra_ptr = 0;		/* Current index into readahead
                                   buffer */
	int num = 0;
	int nblocks, i, err;

	sb = dir->i_sb;

	nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
	start = OCFS2_I(dir)->ip_dir_start_lookup;
	if (start >= nblocks)
		start = 0;
	block = start;

restart:
	do {
		/*
                 * We deal with the read-ahead logic here.
                 */
		if (ra_ptr >= ra_max) {