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gem5 / arm / linux / refs/heads/gem5/v4.4 / . / fs / ocfs2 / dir.c
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/* -*- 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);
}
/*
* "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);
}
static inline unsigned int ocfs2_dir_trailer_blk_off(struct super_block *sb)
{
return sb->s_blocksize - sizeof(struct ocfs2_dir_block_trailer);
}
#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;
}
/*
* 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;
}
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);
}
/*
* 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;
}
static int ocfs2_free_list_at_root(struct ocfs2_dir_lookup_result *res)
{
return res->dl_prev_leaf_bh == NULL;
}
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);
}
static int ocfs2_dir_indexed(struct inode *inode)
{
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INDEXED_DIR_FL)
return 1;
return 0;
}
static inline int ocfs2_dx_root_inline(struct ocfs2_dx_root_block *dx_root)
{
return dx_root->dr_flags & OCFS2_DX_FLAG_INLINE;
}
/*
* 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;
}
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;
}
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];
}
/*
* 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;
}
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);
}
/*
* 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;
}
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;
}
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;
}
/*
* 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;
}
/*
* 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;
}
/*
* 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;
}
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;
}
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;
}
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;
}
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;
}
/*
* 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;
}
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) {
/* Refill the readahead buffer */
ra_ptr = 0;
b = block;
for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
/*
* Terminate if we reach the end of the
* directory and must wrap, or if our
* search has finished at this block.
*/
if (b >= nblocks || (num && block == start)) {
bh_use[ra_max] = NULL;
break;
}
num++;
bh = NULL;
err = ocfs2_read_dir_block(dir, b++, &bh,
OCFS2_BH_READAHEAD);
bh_use[ra_max] = bh;
}
}
if ((bh = bh_use[ra_ptr++]) == NULL)
goto next;
if (ocfs2_read_dir_block(dir, block, &bh, 0)) {
/* read error, skip block & hope for the best.
* ocfs2_read_dir_block() has released the bh. */
mlog(ML_ERROR, "reading directory %llu, "
"offset %lu\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno,
block);
goto next;
}
i = ocfs2_search_dirblock(bh, dir, name, namelen,
block << sb->s_blocksize_bits,
bh->b_data, sb->s_blocksize,
res_dir);
if (i == 1) {
OCFS2_I(dir)->ip_dir_start_lookup = block;
ret = bh;
goto cleanup_and_exit;
} else {
brelse(bh);
if (i < 0)
goto cleanup_and_exit;
}
next:
if (++block >= nblocks)
block = 0;
} while (block != start);
/*
* If the directory has grown while we were searching, then
* search the last part of the directory before giving up.
*/
block = nblocks;
nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
if (block < nblocks) {
start = 0;
goto restart;
}
cleanup_and_exit:
/* Clean up the read-ahead blocks */
for (; ra_ptr < ra_max; ra_ptr++)
brelse(bh_use[ra_ptr]);
trace_ocfs2_find_entry_el(ret);
return ret;
}
static int ocfs2_dx_dir_lookup_rec(struct inode *inode,
struct ocfs2_extent_list *el,
u32 major_hash,
u32 *ret_cpos,
u64 *ret_phys_blkno,
unsigned int *ret_clen)
{
int ret = 0, i, found;
struct buffer_head *eb_bh = NULL;
struct ocfs2_extent_block *eb;
struct ocfs2_extent_rec *rec = NULL;
if (el->l_tree_depth) {
ret = ocfs2_find_leaf(INODE_CACHE(inode), el, major_hash,
&eb_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
eb = (struct ocfs2_extent_block *) eb_bh->b_data;
el = &eb->h_list;
if (el->l_tree_depth) {
ret = ocfs2_error(inode->i_sb,
"Inode %lu has non zero tree depth in btree tree block %llu\n",
inode->i_ino,
(unsigned long long)eb_bh->b_blocknr);
goto out;
}
}
found = 0;
for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
rec = &el->l_recs[i];
if (le32_to_cpu(rec->e_cpos) <= major_hash) {
found = 1;
break;
}
}
if (!found) {
ret = ocfs2_error(inode->i_sb,
"Inode %lu has bad extent record (%u, %u, 0) in btree\n",
inode->i_ino,
le32_to_cpu(rec->e_cpos),
ocfs2_rec_clusters(el, rec));
goto out;
}
if (ret_phys_blkno)
*ret_phys_blkno = le64_to_cpu(rec->e_blkno);
if (ret_cpos)
*ret_cpos = le32_to_cpu(rec->e_cpos);
if (ret_clen)
*ret_clen = le16_to_cpu(rec->e_leaf_clusters);
out:
brelse(eb_bh);
return ret;
}
/*
* Returns the block index, from the start of the cluster which this
* hash belongs too.
*/
static inline unsigned int __ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb,
u32 minor_hash)
{
return minor_hash & osb->osb_dx_mask;
}
static inline unsigned int ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb,
struct ocfs2_dx_hinfo *hinfo)
{
return __ocfs2_dx_dir_hash_idx(osb, hinfo->minor_hash);
}
static int ocfs2_dx_dir_lookup(struct inode *inode,
struct ocfs2_extent_list *el,
struct ocfs2_dx_hinfo *hinfo,
u32 *ret_cpos,
u64 *ret_phys_blkno)
{
int ret = 0;
unsigned int cend, uninitialized_var(clen);
u32 uninitialized_var(cpos);
u64 uninitialized_var(blkno);
u32 name_hash = hinfo->major_hash;
ret = ocfs2_dx_dir_lookup_rec(inode, el, name_hash, &cpos, &blkno,
&clen);
if (ret) {
mlog_errno(ret);
goto out;
}
cend = cpos + clen;
if (name_hash >= cend) {
/* We want the last cluster */
blkno += ocfs2_clusters_to_blocks(inode->i_sb, clen - 1);
cpos += clen - 1;
} else {
blkno += ocfs2_clusters_to_blocks(inode->i_sb,
name_hash - cpos);
cpos = name_hash;
}
/*
* We now have the cluster which should hold our entry. To
* find the exact block from the start of the cluster to
* search, we take the lower bits of the hash.
*/
blkno += ocfs2_dx_dir_hash_idx(OCFS2_SB(inode->i_sb), hinfo);
if (ret_phys_blkno)
*ret_phys_blkno = blkno;
if (ret_cpos)
*ret_cpos = cpos;
out:
return ret;
}
static int ocfs2_dx_dir_search(const char *name, int namelen,
struct inode *dir,
struct ocfs2_dx_root_block *dx_root,
struct ocfs2_dir_lookup_result *res)
{
int ret, i, found;
u64 uninitialized_var(phys);
struct buffer_head *dx_leaf_bh = NULL;
struct ocfs2_dx_leaf *dx_leaf;
struct ocfs2_dx_entry *dx_entry = NULL;
struct buffer_head *dir_ent_bh = NULL;
struct ocfs2_dir_entry *dir_ent = NULL;
struct ocfs2_dx_hinfo *hinfo = &res->dl_hinfo;
struct ocfs2_extent_list *dr_el;
struct ocfs2_dx_entry_list *entry_list;
ocfs2_dx_dir_name_hash(dir, name, namelen, &res->dl_hinfo);
if (ocfs2_dx_root_inline(dx_root)) {
entry_list = &dx_root->dr_entries;
goto search;
}
dr_el = &dx_root->dr_list;
ret = ocfs2_dx_dir_lookup(dir, dr_el, hinfo, NULL, &phys);
if (ret) {
mlog_errno(ret);
goto out;
}
trace_ocfs2_dx_dir_search((unsigned long long)OCFS2_I(dir)->ip_blkno,
namelen, name, hinfo->major_hash,
hinfo->minor_hash, (unsigned long long)phys);
ret = ocfs2_read_dx_leaf(dir, phys, &dx_leaf_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_leaf = (struct ocfs2_dx_leaf *) dx_leaf_bh->b_data;
trace_ocfs2_dx_dir_search_leaf_info(
le16_to_cpu(dx_leaf->dl_list.de_num_used),
le16_to_cpu(dx_leaf->dl_list.de_count));
entry_list = &dx_leaf->dl_list;
search:
/*
* Empty leaf is legal, so no need to check for that.
*/
found = 0;
for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) {
dx_entry = &entry_list->de_entries[i];
if (hinfo->major_hash != le32_to_cpu(dx_entry->dx_major_hash)
|| hinfo->minor_hash != le32_to_cpu(dx_entry->dx_minor_hash))
continue;
/*
* Search unindexed leaf block now. We're not
* guaranteed to find anything.
*/
ret = ocfs2_read_dir_block_direct(dir,
le64_to_cpu(dx_entry->dx_dirent_blk),
&dir_ent_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* XXX: We should check the unindexed block here,
* before using it.
*/
found = ocfs2_search_dirblock(dir_ent_bh, dir, name, namelen,
0, dir_ent_bh->b_data,
dir->i_sb->s_blocksize, &dir_ent);
if (found == 1)
break;
if (found == -1) {
/* This means we found a bad directory entry. */
ret = -EIO;
mlog_errno(ret);
goto out;
}
brelse(dir_ent_bh);
dir_ent_bh = NULL;
}
if (found <= 0) {
ret = -ENOENT;
goto out;
}
res->dl_leaf_bh = dir_ent_bh;
res->dl_entry = dir_ent;
res->dl_dx_leaf_bh = dx_leaf_bh;
res->dl_dx_entry = dx_entry;
ret = 0;
out:
if (ret) {
brelse(dx_leaf_bh);
brelse(dir_ent_bh);
}
return ret;
}
static int ocfs2_find_entry_dx(const char *name, int namelen,
struct inode *dir,
struct ocfs2_dir_lookup_result *lookup)
{
int ret;
struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di;
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dx_root_block *dx_root;
ret = ocfs2_read_inode_block(dir, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
ret = ocfs2_read_dx_root(dir, di, &dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
ret = ocfs2_dx_dir_search(name, namelen, dir, dx_root, lookup);
if (ret) {
if (ret != -ENOENT)
mlog_errno(ret);
goto out;
}
lookup->dl_dx_root_bh = dx_root_bh;
dx_root_bh = NULL;
out:
brelse(di_bh);
brelse(dx_root_bh);
return ret;
}
/*
* Try to find an entry of the provided name within 'dir'.
*
* If nothing was found, -ENOENT is returned. Otherwise, zero is
* returned and the struct 'res' will contain information useful to
* other directory manipulation functions.
*
* Caller can NOT assume anything about the contents of the
* buffer_heads - they are passed back only so that it can be passed
* into any one of the manipulation functions (add entry, delete
* entry, etc). As an example, bh in the extent directory case is a
* data block, in the inline-data case it actually points to an inode,
* in the indexed directory case, multiple buffers are involved.
*/
int ocfs2_find_entry(const char *name, int namelen,
struct inode *dir, struct ocfs2_dir_lookup_result *lookup)
{
struct buffer_head *bh;
struct ocfs2_dir_entry *res_dir = NULL;
if (ocfs2_dir_indexed(dir))
return ocfs2_find_entry_dx(name, namelen, dir, lookup);
/*
* The unindexed dir code only uses part of the lookup
* structure, so there's no reason to push it down further
* than this.
*/
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
bh = ocfs2_find_entry_id(name, namelen, dir, &res_dir);
else
bh = ocfs2_find_entry_el(name, namelen, dir, &res_dir);
if (bh == NULL)
return -ENOENT;
lookup->dl_leaf_bh = bh;
lookup->dl_entry = res_dir;
return 0;
}
/*
* Update inode number and type of a previously found directory entry.
*/
int ocfs2_update_entry(struct inode *dir, handle_t *handle,
struct ocfs2_dir_lookup_result *res,
struct inode *new_entry_inode)
{
int ret;
ocfs2_journal_access_func access = ocfs2_journal_access_db;
struct ocfs2_dir_entry *de = res->dl_entry;
struct buffer_head *de_bh = res->dl_leaf_bh;
/*
* The same code works fine for both inline-data and extent
* based directories, so no need to split this up. The only
* difference is the journal_access function.
*/
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
access = ocfs2_journal_access_di;
ret = access(handle, INODE_CACHE(dir), de_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
de->inode = cpu_to_le64(OCFS2_I(new_entry_inode)->ip_blkno);
ocfs2_set_de_type(de, new_entry_inode->i_mode);
ocfs2_journal_dirty(handle, de_bh);
out:
return ret;
}
/*
* __ocfs2_delete_entry deletes a directory entry by merging it with the
* previous entry
*/
static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir,
struct ocfs2_dir_entry *de_del,
struct buffer_head *bh, char *first_de,
unsigned int bytes)
{
struct ocfs2_dir_entry *de, *pde;
int i, status = -ENOENT;
ocfs2_journal_access_func access = ocfs2_journal_access_db;
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
access = ocfs2_journal_access_di;
i = 0;
pde = NULL;
de = (struct ocfs2_dir_entry *) first_de;
while (i < bytes) {
if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
status = -EIO;
mlog_errno(status);
goto bail;
}
if (de == de_del) {
status = access(handle, INODE_CACHE(dir), bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
status = -EIO;
mlog_errno(status);
goto bail;
}
if (pde)
le16_add_cpu(&pde->rec_len,
le16_to_cpu(de->rec_len));
de->inode = 0;
dir->i_version++;
ocfs2_journal_dirty(handle, bh);
goto bail;
}
i += le16_to_cpu(de->rec_len);
pde = de;
de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
}
bail:
return status;
}
static unsigned int ocfs2_figure_dirent_hole(struct ocfs2_dir_entry *de)
{
unsigned int hole;
if (le64_to_cpu(de->inode) == 0)
hole = le16_to_cpu(de->rec_len);
else
hole = le16_to_cpu(de->rec_len) -
OCFS2_DIR_REC_LEN(de->name_len);
return hole;
}
static int ocfs2_find_max_rec_len(struct super_block *sb,
struct buffer_head *dirblock_bh)
{
int size, this_hole, largest_hole = 0;
char *trailer, *de_buf, *limit, *start = dirblock_bh->b_data;
struct ocfs2_dir_entry *de;
trailer = (char *)ocfs2_trailer_from_bh(dirblock_bh, sb);
size = ocfs2_dir_trailer_blk_off(sb);
limit = start + size;
de_buf = start;
de = (struct ocfs2_dir_entry *)de_buf;
do {
if (de_buf != trailer) {
this_hole = ocfs2_figure_dirent_hole(de);
if (this_hole > largest_hole)
largest_hole = this_hole;
}
de_buf += le16_to_cpu(de->rec_len);
de = (struct ocfs2_dir_entry *)de_buf;
} while (de_buf < limit);
if (largest_hole >= OCFS2_DIR_MIN_REC_LEN)
return largest_hole;
return 0;
}
static void ocfs2_dx_list_remove_entry(struct ocfs2_dx_entry_list *entry_list,
int index)
{
int num_used = le16_to_cpu(entry_list->de_num_used);
if (num_used == 1 || index == (num_used - 1))
goto clear;
memmove(&entry_list->de_entries[index],
&entry_list->de_entries[index + 1],
(num_used - index - 1)*sizeof(struct ocfs2_dx_entry));
clear:
num_used--;
memset(&entry_list->de_entries[num_used], 0,
sizeof(struct ocfs2_dx_entry));
entry_list->de_num_used = cpu_to_le16(num_used);
}
static int ocfs2_delete_entry_dx(handle_t *handle, struct inode *dir,
struct ocfs2_dir_lookup_result *lookup)
{
int ret, index, max_rec_len, add_to_free_list = 0;
struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
struct buffer_head *leaf_bh = lookup->dl_leaf_bh;
struct ocfs2_dx_leaf *dx_leaf;
struct ocfs2_dx_entry *dx_entry = lookup->dl_dx_entry;
struct ocfs2_dir_block_trailer *trailer;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dx_entry_list *entry_list;
/*
* This function gets a bit messy because we might have to
* modify the root block, regardless of whether the indexed
* entries are stored inline.
*/
/*
* *Only* set 'entry_list' here, based on where we're looking
* for the indexed entries. Later, we might still want to
* journal both blocks, based on free list state.
*/
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
if (ocfs2_dx_root_inline(dx_root)) {
entry_list = &dx_root->dr_entries;
} else {
dx_leaf = (struct ocfs2_dx_leaf *) lookup->dl_dx_leaf_bh->b_data;
entry_list = &dx_leaf->dl_list;
}
/* Neither of these are a disk corruption - that should have
* been caught by lookup, before we got here. */
BUG_ON(le16_to_cpu(entry_list->de_count) <= 0);
BUG_ON(le16_to_cpu(entry_list->de_num_used) <= 0);
index = (char *)dx_entry - (char *)entry_list->de_entries;
index /= sizeof(*dx_entry);
if (index >= le16_to_cpu(entry_list->de_num_used)) {
mlog(ML_ERROR, "Dir %llu: Bad dx_entry ptr idx %d, (%p, %p)\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno, index,
entry_list, dx_entry);
return -EIO;
}
/*
* We know that removal of this dirent will leave enough room
* for a new one, so add this block to the free list if it
* isn't already there.
*/
trailer = ocfs2_trailer_from_bh(leaf_bh, dir->i_sb);
if (trailer->db_free_rec_len == 0)
add_to_free_list = 1;
/*
* Add the block holding our index into the journal before
* removing the unindexed entry. If we get an error return
* from __ocfs2_delete_entry(), then it hasn't removed the
* entry yet. Likewise, successful return means we *must*
* remove the indexed entry.
*
* We're also careful to journal the root tree block here as
* the entry count needs to be updated. Also, we might be
* adding to the start of the free list.
*/
ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
if (!ocfs2_dx_root_inline(dx_root)) {
ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir),
lookup->dl_dx_leaf_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
}
trace_ocfs2_delete_entry_dx((unsigned long long)OCFS2_I(dir)->ip_blkno,
index);
ret = __ocfs2_delete_entry(handle, dir, lookup->dl_entry,
leaf_bh, leaf_bh->b_data, leaf_bh->b_size);
if (ret) {
mlog_errno(ret);
goto out;
}
max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, leaf_bh);
trailer->db_free_rec_len = cpu_to_le16(max_rec_len);
if (add_to_free_list) {
trailer->db_free_next = dx_root->dr_free_blk;
dx_root->dr_free_blk = cpu_to_le64(leaf_bh->b_blocknr);
ocfs2_journal_dirty(handle, dx_root_bh);
}
/* leaf_bh was journal_accessed for us in __ocfs2_delete_entry */
ocfs2_journal_dirty(handle, leaf_bh);
le32_add_cpu(&dx_root->dr_num_entries, -1);
ocfs2_journal_dirty(handle, dx_root_bh);
ocfs2_dx_list_remove_entry(entry_list, index);
if (!ocfs2_dx_root_inline(dx_root))
ocfs2_journal_dirty(handle, lookup->dl_dx_leaf_bh);
out:
return ret;
}
static inline int ocfs2_delete_entry_id(handle_t *handle,
struct inode *dir,
struct ocfs2_dir_entry *de_del,
struct buffer_head *bh)
{
int ret;
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;
ret = __ocfs2_delete_entry(handle, dir, de_del, bh, data->id_data,
i_size_read(dir));
brelse(di_bh);
out:
return ret;
}
static inline int ocfs2_delete_entry_el(handle_t *handle,
struct inode *dir,
struct ocfs2_dir_entry *de_del,
struct buffer_head *bh)
{
return __ocfs2_delete_entry(handle, dir, de_del, bh, bh->b_data,
bh->b_size);
}
/*
* Delete a directory entry. Hide the details of directory
* implementation from the caller.
*/
int ocfs2_delete_entry(handle_t *handle,
struct inode *dir,
struct ocfs2_dir_lookup_result *res)
{
if (ocfs2_dir_indexed(dir))
return ocfs2_delete_entry_dx(handle, dir, res);
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return ocfs2_delete_entry_id(handle, dir, res->dl_entry,
res->dl_leaf_bh);
return ocfs2_delete_entry_el(handle, dir, res->dl_entry,
res->dl_leaf_bh);
}
/*
* Check whether 'de' has enough room to hold an entry of
* 'new_rec_len' bytes.
*/
static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de,
unsigned int new_rec_len)
{
unsigned int de_really_used;
/* Check whether this is an empty record with enough space */
if (le64_to_cpu(de->inode) == 0 &&
le16_to_cpu(de->rec_len) >= new_rec_len)
return 1;
/*
* Record might have free space at the end which we can
* use.
*/
de_really_used = OCFS2_DIR_REC_LEN(de->name_len);
if (le16_to_cpu(de->rec_len) >= (de_really_used + new_rec_len))
return 1;
return 0;
}
static void ocfs2_dx_dir_leaf_insert_tail(struct ocfs2_dx_leaf *dx_leaf,
struct ocfs2_dx_entry *dx_new_entry)
{
int i;
i = le16_to_cpu(dx_leaf->dl_list.de_num_used);
dx_leaf->dl_list.de_entries[i] = *dx_new_entry;
le16_add_cpu(&dx_leaf->dl_list.de_num_used, 1);
}
static void ocfs2_dx_entry_list_insert(struct ocfs2_dx_entry_list *entry_list,
struct ocfs2_dx_hinfo *hinfo,
u64 dirent_blk)
{
int i;
struct ocfs2_dx_entry *dx_entry;
i = le16_to_cpu(entry_list->de_num_used);
dx_entry = &entry_list->de_entries[i];
memset(dx_entry, 0, sizeof(*dx_entry));
dx_entry->dx_major_hash = cpu_to_le32(hinfo->major_hash);
dx_entry->dx_minor_hash = cpu_to_le32(hinfo->minor_hash);
dx_entry->dx_dirent_blk = cpu_to_le64(dirent_blk);
le16_add_cpu(&entry_list->de_num_used, 1);
}
static int __ocfs2_dx_dir_leaf_insert(struct inode *dir, handle_t *handle,
struct ocfs2_dx_hinfo *hinfo,
u64 dirent_blk,
struct buffer_head *dx_leaf_bh)
{
int ret;
struct ocfs2_dx_leaf *dx_leaf;
ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), dx_leaf_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data;
ocfs2_dx_entry_list_insert(&dx_leaf->dl_list, hinfo, dirent_blk);
ocfs2_journal_dirty(handle, dx_leaf_bh);
out:
return ret;
}
static void ocfs2_dx_inline_root_insert(struct inode *dir, handle_t *handle,
struct ocfs2_dx_hinfo *hinfo,
u64 dirent_blk,
struct ocfs2_dx_root_block *dx_root)
{
ocfs2_dx_entry_list_insert(&dx_root->dr_entries, hinfo, dirent_blk);
}
static int ocfs2_dx_dir_insert(struct inode *dir, handle_t *handle,
struct ocfs2_dir_lookup_result *lookup)
{
int ret = 0;
struct ocfs2_dx_root_block *dx_root;
struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_root = (struct ocfs2_dx_root_block *)lookup->dl_dx_root_bh->b_data;
if (ocfs2_dx_root_inline(dx_root)) {
ocfs2_dx_inline_root_insert(dir, handle,
&lookup->dl_hinfo,
lookup->dl_leaf_bh->b_blocknr,
dx_root);
} else {
ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &lookup->dl_hinfo,
lookup->dl_leaf_bh->b_blocknr,
lookup->dl_dx_leaf_bh);
if (ret)
goto out;
}
le32_add_cpu(&dx_root->dr_num_entries, 1);
ocfs2_journal_dirty(handle, dx_root_bh);
out:
return ret;
}
static void ocfs2_remove_block_from_free_list(struct inode *dir,
handle_t *handle,
struct ocfs2_dir_lookup_result *lookup)
{
struct ocfs2_dir_block_trailer *trailer, *prev;
struct ocfs2_dx_root_block *dx_root;
struct buffer_head *bh;
trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb);
if (ocfs2_free_list_at_root(lookup)) {
bh = lookup->dl_dx_root_bh;
dx_root = (struct ocfs2_dx_root_block *)bh->b_data;
dx_root->dr_free_blk = trailer->db_free_next;
} else {
bh = lookup->dl_prev_leaf_bh;
prev = ocfs2_trailer_from_bh(bh, dir->i_sb);
prev->db_free_next = trailer->db_free_next;
}
trailer->db_free_rec_len = cpu_to_le16(0);
trailer->db_free_next = cpu_to_le64(0);
ocfs2_journal_dirty(handle, bh);
ocfs2_journal_dirty(handle, lookup->dl_leaf_bh);
}
/*
* This expects that a journal write has been reserved on
* lookup->dl_prev_leaf_bh or lookup->dl_dx_root_bh
*/
static void ocfs2_recalc_free_list(struct inode *dir, handle_t *handle,
struct ocfs2_dir_lookup_result *lookup)
{
int max_rec_len;
struct ocfs2_dir_block_trailer *trailer;
/* Walk dl_leaf_bh to figure out what the new free rec_len is. */
max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, lookup->dl_leaf_bh);
if (max_rec_len) {
/*
* There's still room in this block, so no need to remove it
* from the free list. In this case, we just want to update
* the rec len accounting.
*/
trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb);
trailer->db_free_rec_len = cpu_to_le16(max_rec_len);
ocfs2_journal_dirty(handle, lookup->dl_leaf_bh);
} else {
ocfs2_remove_block_from_free_list(dir, handle, lookup);
}
}
/* we don't always have a dentry for what we want to add, so people
* like orphan dir can call this instead.
*
* The lookup context must have been filled from
* ocfs2_prepare_dir_for_insert.
*/
int __ocfs2_add_entry(handle_t *handle,
struct inode *dir,
const char *name, int namelen,
struct inode *inode, u64 blkno,
struct buffer_head *parent_fe_bh,
struct ocfs2_dir_lookup_result *lookup)
{
unsigned long offset;
unsigned short rec_len;
struct ocfs2_dir_entry *de, *de1;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_fe_bh->b_data;
struct super_block *sb = dir->i_sb;
int retval;
unsigned int size = sb->s_blocksize;
struct buffer_head *insert_bh = lookup->dl_leaf_bh;
char *data_start = insert_bh->b_data;
if (!namelen)
return -EINVAL;
if (ocfs2_dir_indexed(dir)) {
struct buffer_head *bh;
/*
* An indexed dir may require that we update the free space
* list. Reserve a write to the previous node in the list so
* that we don't fail later.
*
* XXX: This can be either a dx_root_block, or an unindexed
* directory tree leaf block.
*/
if (ocfs2_free_list_at_root(lookup)) {
bh = lookup->dl_dx_root_bh;
retval = ocfs2_journal_access_dr(handle,
INODE_CACHE(dir), bh,
OCFS2_JOURNAL_ACCESS_WRITE);
} else {
bh = lookup->dl_prev_leaf_bh;
retval = ocfs2_journal_access_db(handle,
INODE_CACHE(dir), bh,
OCFS2_JOURNAL_ACCESS_WRITE);
}
if (retval) {
mlog_errno(retval);
return retval;
}
} else if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
data_start = di->id2.i_data.id_data;
size = i_size_read(dir);
BUG_ON(insert_bh != parent_fe_bh);
}
rec_len = OCFS2_DIR_REC_LEN(namelen);
offset = 0;
de = (struct ocfs2_dir_entry *) data_start;
while (1) {
BUG_ON((char *)de >= (size + data_start));
/* These checks should've already been passed by the
* prepare function, but I guess we can leave them
* here anyway. */
if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
retval = -ENOENT;
goto bail;
}
if (ocfs2_match(namelen, name, de)) {
retval = -EEXIST;
goto bail;
}
/* We're guaranteed that we should have space, so we
* can't possibly have hit the trailer...right? */
mlog_bug_on_msg(ocfs2_skip_dir_trailer(dir, de, offset, size),
"Hit dir trailer trying to insert %.*s "
"(namelen %d) into directory %llu. "
"offset is %lu, trailer offset is %d\n",
namelen, name, namelen,
(unsigned long long)parent_fe_bh->b_blocknr,
offset, ocfs2_dir_trailer_blk_off(dir->i_sb));
if (ocfs2_dirent_would_fit(de, rec_len)) {
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
if (retval < 0) {
mlog_errno(retval);
goto bail;
}
if (insert_bh == parent_fe_bh)
retval = ocfs2_journal_access_di(handle,
INODE_CACHE(dir),
insert_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
else {
retval = ocfs2_journal_access_db(handle,
INODE_CACHE(dir),
insert_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (!retval && ocfs2_dir_indexed(dir))
retval = ocfs2_dx_dir_insert(dir,
handle,
lookup);
}
if (retval) {
mlog_errno(retval);
goto bail;
}
/* By now the buffer is marked for journaling */
offset += le16_to_cpu(de->rec_len);
if (le64_to_cpu(de->inode)) {
de1 = (struct ocfs2_dir_entry *)((char *) de +
OCFS2_DIR_REC_LEN(de->name_len));
de1->rec_len =
cpu_to_le16(le16_to_cpu(de->rec_len) -
OCFS2_DIR_REC_LEN(de->name_len));
de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
de = de1;
}
de->file_type = OCFS2_FT_UNKNOWN;
if (blkno) {
de->inode = cpu_to_le64(blkno);
ocfs2_set_de_type(de, inode->i_mode);
} else
de->inode = 0;
de->name_len = namelen;
memcpy(de->name, name, namelen);
if (ocfs2_dir_indexed(dir))
ocfs2_recalc_free_list(dir, handle, lookup);
dir->i_version++;
ocfs2_journal_dirty(handle, insert_bh);
retval = 0;
goto bail;
}
offset += le16_to_cpu(de->rec_len);
de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
}
/* when you think about it, the assert above should prevent us
* from ever getting here. */
retval = -ENOSPC;
bail:
if (retval)
mlog_errno(retval);
return retval;
}
static int ocfs2_dir_foreach_blk_id(struct inode *inode,
u64 *f_version,
struct dir_context *ctx)
{
int ret, i;
unsigned long offset = ctx->pos;
struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di;
struct ocfs2_inline_data *data;
struct ocfs2_dir_entry *de;
ret = ocfs2_read_inode_block(inode, &di_bh);
if (ret) {
mlog(ML_ERROR, "Unable to read inode block for dir %llu\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno);
goto out;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
data = &di->id2.i_data;
while (ctx->pos < i_size_read(inode)) {
/* If the dir block has changed since the last call to
* readdir(2), then we might be pointing to an invalid
* dirent right now. Scan from the start of the block
* to make sure. */
if (*f_version != inode->i_version) {
for (i = 0; i < i_size_read(inode) && i < offset; ) {
de = (struct ocfs2_dir_entry *)
(data->id_data + i);
/* It's too expensive to do a full
* dirent test each time round this
* loop, but we do have to test at
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
if (le16_to_cpu(de->rec_len) <
OCFS2_DIR_REC_LEN(1))
break;
i += le16_to_cpu(de->rec_len);
}
ctx->pos = offset = i;
*f_version = inode->i_version;
}
de = (struct ocfs2_dir_entry *) (data->id_data + ctx->pos);
if (!ocfs2_check_dir_entry(inode, de, di_bh, ctx->pos)) {
/* On error, skip the f_pos to the end. */
ctx->pos = i_size_read(inode);
break;
}
offset += le16_to_cpu(de->rec_len);
if (le64_to_cpu(de->inode)) {
unsigned char d_type = DT_UNKNOWN;
if (de->file_type < OCFS2_FT_MAX)
d_type = ocfs2_filetype_table[de->file_type];
if (!dir_emit(ctx, de->name, de->name_len,
le64_to_cpu(de->inode), d_type))
goto out;
}
ctx->pos += le16_to_cpu(de->rec_len);
}
out:
brelse(di_bh);
return 0;
}
/*
* NOTE: This function can be called against unindexed directories,
* and indexed ones.
*/
static int ocfs2_dir_foreach_blk_el(struct inode *inode,
u64 *f_version,
struct dir_context *ctx,
bool persist)
{
unsigned long offset, blk, last_ra_blk = 0;
int i;
struct buffer_head * bh, * tmp;
struct ocfs2_dir_entry * de;
struct super_block * sb = inode->i_sb;
unsigned int ra_sectors = 16;
int stored = 0;
bh = NULL;
offset = ctx->pos & (sb->s_blocksize - 1);
while (ctx->pos < i_size_read(inode)) {
blk = ctx->pos >> sb->s_blocksize_bits;
if (ocfs2_read_dir_block(inode, blk, &bh, 0)) {
/* Skip the corrupt dirblock and keep trying */
ctx->pos += sb->s_blocksize - offset;
continue;
}
/* The idea here is to begin with 8k read-ahead and to stay
* 4k ahead of our current position.
*
* TODO: Use the pagecache for this. We just need to
* make sure it's cluster-safe... */
if (!last_ra_blk
|| (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) {
for (i = ra_sectors >> (sb->s_blocksize_bits - 9);
i > 0; i--) {
tmp = NULL;
if (!ocfs2_read_dir_block(inode, ++blk, &tmp,
OCFS2_BH_READAHEAD))
brelse(tmp);
}
last_ra_blk = blk;
ra_sectors = 8;
}
/* If the dir block has changed since the last call to
* readdir(2), then we might be pointing to an invalid
* dirent right now. Scan from the start of the block
* to make sure. */
if (*f_version != inode->i_version) {
for (i = 0; i < sb->s_blocksize && i < offset; ) {
de = (struct ocfs2_dir_entry *) (bh->b_data + i);
/* It's too expensive to do a full
* dirent test each time round this
* loop, but we do have to test at
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
if (le16_to_cpu(de->rec_len) <
OCFS2_DIR_REC_LEN(1))
break;
i += le16_to_cpu(de->rec_len);
}
offset = i;
ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1))
| offset;
*f_version = inode->i_version;
}
while (ctx->pos < i_size_read(inode)
&& offset < sb->s_blocksize) {
de = (struct ocfs2_dir_entry *) (bh->b_data + offset);
if (!ocfs2_check_dir_entry(inode, de, bh, offset)) {
/* On error, skip the f_pos to the
next block. */
ctx->pos = (ctx->pos | (sb->s_blocksize - 1)) + 1;
brelse(bh);
continue;
}
if (le64_to_cpu(de->inode)) {
unsigned char d_type = DT_UNKNOWN;
if (de->file_type < OCFS2_FT_MAX)
d_type = ocfs2_filetype_table[de->file_type];
if (!dir_emit(ctx, de->name,
de->name_len,
le64_to_cpu(de->inode),
d_type)) {
brelse(bh);
return 0;
}
stored++;
}
offset += le16_to_cpu(de->rec_len);
ctx->pos += le16_to_cpu(de->rec_len);
}
offset = 0;
brelse(bh);
bh = NULL;
if (!persist && stored)
break;
}
return 0;
}
static int ocfs2_dir_foreach_blk(struct inode *inode, u64 *f_version,
struct dir_context *ctx,
bool persist)
{
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return ocfs2_dir_foreach_blk_id(inode, f_version, ctx);
return ocfs2_dir_foreach_blk_el(inode, f_version, ctx, persist);
}
/*
* This is intended to be called from inside other kernel functions,
* so we fake some arguments.
*/
int ocfs2_dir_foreach(struct inode *inode, struct dir_context *ctx)
{
u64 version = inode->i_version;
ocfs2_dir_foreach_blk(inode, &version, ctx, true);
return 0;
}
/*
* ocfs2_readdir()
*
*/
int ocfs2_readdir(struct file *file, struct dir_context *ctx)
{
int error = 0;
struct inode *inode = file_inode(file);
int lock_level = 0;
trace_ocfs2_readdir((unsigned long long)OCFS2_I(inode)->ip_blkno);
error = ocfs2_inode_lock_atime(inode, file->f_path.mnt, &lock_level);
if (lock_level && error >= 0) {
/* We release EX lock which used to update atime
* and get PR lock again to reduce contention
* on commonly accessed directories. */
ocfs2_inode_unlock(inode, 1);
lock_level = 0;
error = ocfs2_inode_lock(inode, NULL, 0);
}
if (error < 0) {
if (error != -ENOENT)
mlog_errno(error);
/* we haven't got any yet, so propagate the error. */
goto bail_nolock;
}
error = ocfs2_dir_foreach_blk(inode, &file->f_version, ctx, false);
ocfs2_inode_unlock(inode, lock_level);
if (error)
mlog_errno(error);
bail_nolock:
return error;
}
/*
* NOTE: this should always be called with parent dir i_mutex taken.
*/
int ocfs2_find_files_on_disk(const char *name,
int namelen,
u64 *blkno,
struct inode *inode,
struct ocfs2_dir_lookup_result *lookup)
{
int status = -ENOENT;
trace_ocfs2_find_files_on_disk(namelen, name, blkno,
(unsigned long long)OCFS2_I(inode)->ip_blkno);
status = ocfs2_find_entry(name, namelen, inode, lookup);
if (status)
goto leave;
*blkno = le64_to_cpu(lookup->dl_entry->inode);
status = 0;
leave:
return status;
}
/*
* Convenience function for callers which just want the block number
* mapped to a name and don't require the full dirent info, etc.
*/
int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
int namelen, u64 *blkno)
{
int ret;
struct ocfs2_dir_lookup_result lookup = { NULL, };
ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &lookup);
ocfs2_free_dir_lookup_result(&lookup);
return ret;
}
/* Check for a name within a directory.
*
* Return 0 if the name does not exist
* Return -EEXIST if the directory contains the name
*
* Callers should have i_mutex + a cluster lock on dir
*/
int ocfs2_check_dir_for_entry(struct inode *dir,
const char *name,
int namelen)
{
int ret = 0;
struct ocfs2_dir_lookup_result lookup = { NULL, };
trace_ocfs2_check_dir_for_entry(
(unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name);
if (ocfs2_find_entry(name, namelen, dir, &lookup) == 0) {
ret = -EEXIST;
mlog_errno(ret);
}
ocfs2_free_dir_lookup_result(&lookup);
return ret;
}
struct ocfs2_empty_dir_priv {
struct dir_context ctx;
unsigned seen_dot;
unsigned seen_dot_dot;
unsigned seen_other;
unsigned dx_dir;
};
static int ocfs2_empty_dir_filldir(struct dir_context *ctx, const char *name,
int name_len, loff_t pos, u64 ino,
unsigned type)
{
struct ocfs2_empty_dir_priv *p =
container_of(ctx, struct ocfs2_empty_dir_priv, ctx);
/*
* Check the positions of "." and ".." records to be sure
* they're in the correct place.
*
* Indexed directories don't need to proceed past the first
* two entries, so we end the scan after seeing '..'. Despite
* that, we allow the scan to proceed In the event that we
* have a corrupted indexed directory (no dot or dot dot
* entries). This allows us to double check for existing
* entries which might not have been found in the index.
*/
if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) {
p->seen_dot = 1;
return 0;
}
if (name_len == 2 && !strncmp("..", name, 2) &&
pos == OCFS2_DIR_REC_LEN(1)) {
p->seen_dot_dot = 1;
if (p->dx_dir && p->seen_dot)
return 1;
return 0;
}
p->seen_other = 1;
return 1;
}
static int ocfs2_empty_dir_dx(struct inode *inode,
struct ocfs2_empty_dir_priv *priv)
{
int ret;
struct buffer_head *di_bh = NULL;
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dinode *di;
struct ocfs2_dx_root_block *dx_root;
priv->dx_dir = 1;
ret = ocfs2_read_inode_block(inode, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
ret = ocfs2_read_dx_root(inode, di, &dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
if (le32_to_cpu(dx_root->dr_num_entries) != 2)
priv->seen_other = 1;
out:
brelse(di_bh);
brelse(dx_root_bh);
return ret;
}
/*
* routine to check that the specified directory is empty (for rmdir)
*
* Returns 1 if dir is empty, zero otherwise.
*
* XXX: This is a performance problem for unindexed directories.
*/
int ocfs2_empty_dir(struct inode *inode)
{
int ret;
struct ocfs2_empty_dir_priv priv = {
.ctx.actor = ocfs2_empty_dir_filldir,
};
if (ocfs2_dir_indexed(inode)) {
ret = ocfs2_empty_dir_dx(inode, &priv);
if (ret)
mlog_errno(ret);
/*
* We still run ocfs2_dir_foreach to get the checks
* for "." and "..".
*/
}
ret = ocfs2_dir_foreach(inode, &priv.ctx);
if (ret)
mlog_errno(ret);
if (!priv.seen_dot || !priv.seen_dot_dot) {
mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno);
/*
* XXX: Is it really safe to allow an unlink to continue?
*/
return 1;
}
return !priv.seen_other;
}
/*
* Fills "." and ".." dirents in a new directory block. Returns dirent for
* "..", which might be used during creation of a directory with a trailing
* header. It is otherwise safe to ignore the return code.
*/
static struct ocfs2_dir_entry *ocfs2_fill_initial_dirents(struct inode *inode,
struct inode *parent,
char *start,
unsigned int size)
{
struct ocfs2_dir_entry *de = (struct ocfs2_dir_entry *)start;
de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
de->name_len = 1;
de->rec_len =
cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
strcpy(de->name, ".");
ocfs2_set_de_type(de, S_IFDIR);
de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
de->rec_len = cpu_to_le16(size - OCFS2_DIR_REC_LEN(1));
de->name_len = 2;
strcpy(de->name, "..");
ocfs2_set_de_type(de, S_IFDIR);
return de;
}
/*
* This works together with code in ocfs2_mknod_locked() which sets
* the inline-data flag and initializes the inline-data section.
*/
static int ocfs2_fill_new_dir_id(struct ocfs2_super *osb,
handle_t *handle,
struct inode *parent,
struct inode *inode,
struct buffer_head *di_bh)
{
int ret;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
struct ocfs2_inline_data *data = &di->id2.i_data;
unsigned int size = le16_to_cpu(data->id_count);
ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
ocfs2_fill_initial_dirents(inode, parent, data->id_data, size);
ocfs2_journal_dirty(handle, di_bh);
i_size_write(inode, size);
set_nlink(inode, 2);
inode->i_blocks = ocfs2_inode_sector_count(inode);
ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
if (ret < 0)
mlog_errno(ret);
out:
return ret;
}
static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
handle_t *handle,
struct inode *parent,
struct inode *inode,
struct buffer_head *fe_bh,
struct ocfs2_alloc_context *data_ac,
struct buffer_head **ret_new_bh)
{
int status;
unsigned int size = osb->sb->s_blocksize;
struct buffer_head *new_bh = NULL;
struct ocfs2_dir_entry *de;
if (ocfs2_new_dir_wants_trailer(inode))
size = ocfs2_dir_trailer_blk_off(parent->i_sb);
status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
data_ac, NULL, &new_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
status = ocfs2_journal_access_db(handle, INODE_CACHE(inode), new_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (status < 0) {
mlog_errno(status);
goto bail;
}
memset(new_bh->b_data, 0, osb->sb->s_blocksize);
de = ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data, size);
if (ocfs2_new_dir_wants_trailer(inode)) {
int size = le16_to_cpu(de->rec_len);
/*
* Figure out the size of the hole left over after
* insertion of '.' and '..'. The trailer wants this
* information.
*/
size -= OCFS2_DIR_REC_LEN(2);
size -= sizeof(struct ocfs2_dir_block_trailer);
ocfs2_init_dir_trailer(inode, new_bh, size);
}
ocfs2_journal_dirty(handle, new_bh);
i_size_write(inode, inode->i_sb->s_blocksize);
set_nlink(inode, 2);
inode->i_blocks = ocfs2_inode_sector_count(inode);
status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = 0;
if (ret_new_bh) {
*ret_new_bh = new_bh;
new_bh = NULL;
}
bail:
brelse(new_bh);
return status;
}
static int ocfs2_dx_dir_attach_index(struct ocfs2_super *osb,
handle_t *handle, struct inode *dir,
struct buffer_head *di_bh,
struct buffer_head *dirdata_bh,
struct ocfs2_alloc_context *meta_ac,
int dx_inline, u32 num_entries,
struct buffer_head **ret_dx_root_bh)
{
int ret;
struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
u16 dr_suballoc_bit;
u64 suballoc_loc, dr_blkno;
unsigned int num_bits;
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dir_block_trailer *trailer =
ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb);
ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
&dr_suballoc_bit, &num_bits, &dr_blkno);
if (ret) {
mlog_errno(ret);
goto out;
}
trace_ocfs2_dx_dir_attach_index(
(unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long long)dr_blkno);
dx_root_bh = sb_getblk(osb->sb, dr_blkno);
if (dx_root_bh == NULL) {
ret = -ENOMEM;
goto out;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dx_root_bh);
ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
memset(dx_root, 0, osb->sb->s_blocksize);
strcpy(dx_root->dr_signature, OCFS2_DX_ROOT_SIGNATURE);
dx_root->dr_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
dx_root->dr_suballoc_loc = cpu_to_le64(suballoc_loc);
dx_root->dr_suballoc_bit = cpu_to_le16(dr_suballoc_bit);
dx_root->dr_fs_generation = cpu_to_le32(osb->fs_generation);
dx_root->dr_blkno = cpu_to_le64(dr_blkno);
dx_root->dr_dir_blkno = cpu_to_le64(OCFS2_I(dir)->ip_blkno);
dx_root->dr_num_entries = cpu_to_le32(num_entries);
if (le16_to_cpu(trailer->db_free_rec_len))
dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr);
else
dx_root->dr_free_blk = cpu_to_le64(0);
if (dx_inline) {
dx_root->dr_flags |= OCFS2_DX_FLAG_INLINE;
dx_root->dr_entries.de_count =
cpu_to_le16(ocfs2_dx_entries_per_root(osb->sb));
} else {
dx_root->dr_list.l_count =
cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb));
}
ocfs2_journal_dirty(handle, dx_root_bh);
ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret) {
mlog_errno(ret);
goto out;
}
di->i_dx_root = cpu_to_le64(dr_blkno);
spin_lock(&OCFS2_I(dir)->ip_lock);
OCFS2_I(dir)->ip_dyn_features |= OCFS2_INDEXED_DIR_FL;
di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
spin_unlock(&OCFS2_I(dir)->ip_lock);
ocfs2_journal_dirty(handle, di_bh);
*ret_dx_root_bh = dx_root_bh;
dx_root_bh = NULL;
out:
brelse(dx_root_bh);
return ret;
}
static int ocfs2_dx_dir_format_cluster(struct ocfs2_super *osb,
handle_t *handle, struct inode *dir,
struct buffer_head **dx_leaves,
int num_dx_leaves, u64 start_blk)
{
int ret, i;
struct ocfs2_dx_leaf *dx_leaf;
struct buffer_head *bh;
for (i = 0; i < num_dx_leaves; i++) {
bh = sb_getblk(osb->sb, start_blk + i);
if (bh == NULL) {
ret = -ENOMEM;
goto out;
}
dx_leaves[i] = bh;
ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), bh);
ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
dx_leaf = (struct ocfs2_dx_leaf *) bh->b_data;
memset(dx_leaf, 0, osb->sb->s_blocksize);
strcpy(dx_leaf->dl_signature, OCFS2_DX_LEAF_SIGNATURE);
dx_leaf->dl_fs_generation = cpu_to_le32(osb->fs_generation);
dx_leaf->dl_blkno = cpu_to_le64(bh->b_blocknr);
dx_leaf->dl_list.de_count =
cpu_to_le16(ocfs2_dx_entries_per_leaf(osb->sb));
trace_ocfs2_dx_dir_format_cluster(
(unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long long)bh->b_blocknr,
le16_to_cpu(dx_leaf->dl_list.de_count));
ocfs2_journal_dirty(handle, bh);
}
ret = 0;
out:
return ret;
}
/*
* Allocates and formats a new cluster for use in an indexed dir
* leaf. This version will not do the extent insert, so that it can be
* used by operations which need careful ordering.
*/
static int __ocfs2_dx_dir_new_cluster(struct inode *dir,
u32 cpos, handle_t *handle,
struct ocfs2_alloc_context *data_ac,
struct buffer_head **dx_leaves,
int num_dx_leaves, u64 *ret_phys_blkno)
{
int ret;
u32 phys, num;
u64 phys_blkno;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
/*
* XXX: For create, this should claim cluster for the index
* *before* the unindexed insert so that we have a better
* chance of contiguousness as the directory grows in number
* of entries.
*/
ret = __ocfs2_claim_clusters(handle, data_ac, 1, 1, &phys, &num);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* Format the new cluster first. That way, we're inserting
* valid data.
*/
phys_blkno = ocfs2_clusters_to_blocks(osb->sb, phys);
ret = ocfs2_dx_dir_format_cluster(osb, handle, dir, dx_leaves,
num_dx_leaves, phys_blkno);
if (ret) {
mlog_errno(ret);
goto out;
}
*ret_phys_blkno = phys_blkno;
out:
return ret;
}
static int ocfs2_dx_dir_new_cluster(struct inode *dir,
struct ocfs2_extent_tree *et,
u32 cpos, handle_t *handle,
struct ocfs2_alloc_context *data_ac,
struct ocfs2_alloc_context *meta_ac,
struct buffer_head **dx_leaves,
int num_dx_leaves)
{
int ret;
u64 phys_blkno;
ret = __ocfs2_dx_dir_new_cluster(dir, cpos, handle, data_ac, dx_leaves,
num_dx_leaves, &phys_blkno);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_insert_extent(handle, et, cpos, phys_blkno, 1, 0,
meta_ac);
if (ret)
mlog_errno(ret);
out:
return ret;
}
static struct buffer_head **ocfs2_dx_dir_kmalloc_leaves(struct super_block *sb,
int *ret_num_leaves)
{
int num_dx_leaves = ocfs2_clusters_to_blocks(sb, 1);
struct buffer_head **dx_leaves;
dx_leaves = kcalloc(num_dx_leaves, sizeof(struct buffer_head *),
GFP_NOFS);
if (dx_leaves && ret_num_leaves)
*ret_num_leaves = num_dx_leaves;
return dx_leaves;
}
static int ocfs2_fill_new_dir_dx(struct ocfs2_super *osb,
handle_t *handle,
struct inode *parent,
struct inode *inode,
struct buffer_head *di_bh,
struct ocfs2_alloc_context *data_ac,
struct ocfs2_alloc_context *meta_ac)
{
int ret;
struct buffer_head *leaf_bh = NULL;
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dx_hinfo hinfo;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dx_entry_list *entry_list;
/*
* Our strategy is to create the directory as though it were
* unindexed, then add the index block. This works with very
* little complication since the state of a new directory is a
* very well known quantity.
*
* Essentially, we have two dirents ("." and ".."), in the 1st
* block which need indexing. These are easily inserted into
* the index block.
*/
ret = ocfs2_fill_new_dir_el(osb, handle, parent, inode, di_bh,
data_ac, &leaf_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_dx_dir_attach_index(osb, handle, inode, di_bh, leaf_bh,
meta_ac, 1, 2, &dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
entry_list = &dx_root->dr_entries;
/* Buffer has been journaled for us by ocfs2_dx_dir_attach_index */
ocfs2_dx_dir_name_hash(inode, ".", 1, &hinfo);
ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr);
ocfs2_dx_dir_name_hash(inode, "..", 2, &hinfo);
ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr);
out:
brelse(dx_root_bh);
brelse(leaf_bh);
return ret;
}
int ocfs2_fill_new_dir(struct ocfs2_super *osb,
handle_t *handle,
struct inode *parent,
struct inode *inode,
struct buffer_head *fe_bh,
struct ocfs2_alloc_context *data_ac,
struct ocfs2_alloc_context *meta_ac)
{
BUG_ON(!ocfs2_supports_inline_data(osb) && data_ac == NULL);
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return ocfs2_fill_new_dir_id(osb, handle, parent, inode, fe_bh);
if (ocfs2_supports_indexed_dirs(osb))
return ocfs2_fill_new_dir_dx(osb, handle, parent, inode, fe_bh,
data_ac, meta_ac);
return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh,
data_ac, NULL);
}
static int ocfs2_dx_dir_index_block(struct inode *dir,
handle_t *handle,
struct buffer_head **dx_leaves,
int num_dx_leaves,
u32 *num_dx_entries,
struct buffer_head *dirent_bh)
{
int ret = 0, namelen, i;
char *de_buf, *limit;
struct ocfs2_dir_entry *de;
struct buffer_head *dx_leaf_bh;
struct ocfs2_dx_hinfo hinfo;
u64 dirent_blk = dirent_bh->b_blocknr;
de_buf = dirent_bh->b_data;
limit = de_buf + dir->i_sb->s_blocksize;
while (de_buf < limit) {
de = (struct ocfs2_dir_entry *)de_buf;
namelen = de->name_len;
if (!namelen || !de->inode)
goto inc;
ocfs2_dx_dir_name_hash(dir, de->name, namelen, &hinfo);
i = ocfs2_dx_dir_hash_idx(OCFS2_SB(dir->i_sb), &hinfo);
dx_leaf_bh = dx_leaves[i];
ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &hinfo,
dirent_blk, dx_leaf_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
*num_dx_entries = *num_dx_entries + 1;
inc:
de_buf += le16_to_cpu(de->rec_len);
}
out:
return ret;
}
/*
* XXX: This expects dx_root_bh to already be part of the transaction.
*/
static void ocfs2_dx_dir_index_root_block(struct inode *dir,
struct buffer_head *dx_root_bh,
struct buffer_head *dirent_bh)
{
char *de_buf, *limit;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dir_entry *de;
struct ocfs2_dx_hinfo hinfo;
u64 dirent_blk = dirent_bh->b_blocknr;
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
de_buf = dirent_bh->b_data;
limit = de_buf + dir->i_sb->s_blocksize;
while (de_buf < limit) {
de = (struct ocfs2_dir_entry *)de_buf;
if (!de->name_len || !de->inode)
goto inc;
ocfs2_dx_dir_name_hash(dir, de->name, de->name_len, &hinfo);
trace_ocfs2_dx_dir_index_root_block(
(unsigned long long)dir->i_ino,
hinfo.major_hash, hinfo.minor_hash,
de->name_len, de->name,
le16_to_cpu(dx_root->dr_entries.de_num_used));
ocfs2_dx_entry_list_insert(&dx_root->dr_entries, &hinfo,
dirent_blk);
le32_add_cpu(&dx_root->dr_num_entries, 1);
inc:
de_buf += le16_to_cpu(de->rec_len);
}
}
/*
* Count the number of inline directory entries in di_bh and compare
* them against the number of entries we can hold in an inline dx root
* block.
*/
static int ocfs2_new_dx_should_be_inline(struct inode *dir,
struct buffer_head *di_bh)
{
int dirent_count = 0;
char *de_buf, *limit;
struct ocfs2_dir_entry *de;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
de_buf = di->id2.i_data.id_data;
limit = de_buf + i_size_read(dir);
while (de_buf < limit) {
de = (struct ocfs2_dir_entry *)de_buf;
if (de->name_len && de->inode)
dirent_count++;
de_buf += le16_to_cpu(de->rec_len);
}
/* We are careful to leave room for one extra record. */
return dirent_count < ocfs2_dx_entries_per_root(dir->i_sb);
}
/*
* Expand rec_len of the rightmost dirent in a directory block so that it
* contains the end of our valid space for dirents. We do this during
* expansion from an inline directory to one with extents. The first dir block
* in that case is taken from the inline data portion of the inode block.
*
* This will also return the largest amount of contiguous space for a dirent
* in the block. That value is *not* necessarily the last dirent, even after
* expansion. The directory indexing code wants this value for free space
* accounting. We do this here since we're already walking the entire dir
* block.
*
* We add the dir trailer if this filesystem wants it.
*/
static unsigned int ocfs2_expand_last_dirent(char *start, unsigned int old_size,
struct inode *dir)
{
struct super_block *sb = dir->i_sb;
struct ocfs2_dir_entry *de;
struct ocfs2_dir_entry *prev_de;
char *de_buf, *limit;
unsigned int new_size = sb->s_blocksize;
unsigned int bytes, this_hole;
unsigned int largest_hole = 0;
if (ocfs2_new_dir_wants_trailer(dir))
new_size = ocfs2_dir_trailer_blk_off(sb);
bytes = new_size - old_size;
limit = start + old_size;
de_buf = start;
de = (struct ocfs2_dir_entry *)de_buf;
do {
this_hole = ocfs2_figure_dirent_hole(de);
if (this_hole > largest_hole)
largest_hole = this_hole;
prev_de = de;
de_buf += le16_to_cpu(de->rec_len);
de = (struct ocfs2_dir_entry *)de_buf;
} while (de_buf < limit);
le16_add_cpu(&prev_de->rec_len, bytes);
/* We need to double check this after modification of the final
* dirent. */
this_hole = ocfs2_figure_dirent_hole(prev_de);
if (this_hole > largest_hole)
largest_hole = this_hole;
if (largest_hole >= OCFS2_DIR_MIN_REC_LEN)
return largest_hole;
return 0;
}
/*
* We allocate enough clusters to fulfill "blocks_wanted", but set
* i_size to exactly one block. Ocfs2_extend_dir() will handle the
* rest automatically for us.
*
* *first_block_bh is a pointer to the 1st data block allocated to the
* directory.
*/
static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
unsigned int blocks_wanted,
struct ocfs2_dir_lookup_result *lookup,
struct buffer_head **first_block_bh)
{
u32 alloc, dx_alloc, bit_off, len, num_dx_entries = 0;
struct super_block *sb = dir->i_sb;
int ret, i, num_dx_leaves = 0, dx_inline = 0,
credits = ocfs2_inline_to_extents_credits(sb);
u64 dx_insert_blkno, blkno,
bytes = blocks_wanted << sb->s_blocksize_bits;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct ocfs2_inode_info *oi = OCFS2_I(dir);
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_alloc_context *meta_ac = NULL;
struct buffer_head *dirdata_bh = NULL;
struct buffer_head *dx_root_bh = NULL;
struct buffer_head **dx_leaves = NULL;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
handle_t *handle;
struct ocfs2_extent_tree et;
struct ocfs2_extent_tree dx_et;
int did_quota = 0, bytes_allocated = 0;
ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(dir), di_bh);
alloc = ocfs2_clusters_for_bytes(sb, bytes);
dx_alloc = 0;
down_write(&oi->ip_alloc_sem);
if (ocfs2_supports_indexed_dirs(osb)) {
credits += ocfs2_add_dir_index_credits(sb);
dx_inline = ocfs2_new_dx_should_be_inline(dir, di_bh);
if (!dx_inline) {
/* Add one more cluster for an index leaf */
dx_alloc++;
dx_leaves = ocfs2_dx_dir_kmalloc_leaves(sb,
&num_dx_leaves);
if (!dx_leaves) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
}
/* This gets us the dx_root */
ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
if (ret) {
mlog_errno(ret);
goto out;
}
}
/*
* We should never need more than 2 clusters for the unindexed
* tree - maximum dirent size is far less than one block. In
* fact, the only time we'd need more than one cluster is if
* blocksize == clustersize and the dirent won't fit in the
* extra space that the expansion to a single block gives. As
* of today, that only happens on 4k/4k file systems.
*/
BUG_ON(alloc > 2);
ret = ocfs2_reserve_clusters(osb, alloc + dx_alloc, &data_ac);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* Prepare for worst case allocation scenario of two separate
* extents in the unindexed tree.
*/
if (alloc == 2)
credits += OCFS2_SUBALLOC_ALLOC;
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out;
}
ret = dquot_alloc_space_nodirty(dir,
ocfs2_clusters_to_bytes(osb->sb, alloc + dx_alloc));
if (ret)
goto out_commit;
did_quota = 1;
if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) {
/*
* Allocate our index cluster first, to maximize the
* possibility that unindexed leaves grow
* contiguously.
*/
ret = __ocfs2_dx_dir_new_cluster(dir, 0, handle, data_ac,
dx_leaves, num_dx_leaves,
&dx_insert_blkno);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
}
/*
* Try to claim as many clusters as the bitmap can give though
* if we only get one now, that's enough to continue. The rest
* will be claimed after the conversion to extents.
*/
if (ocfs2_dir_resv_allowed(osb))
data_ac->ac_resv = &oi->ip_la_data_resv;
ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off, &len);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
/*
* Operations are carefully ordered so that we set up the new
* data block first. The conversion from inline data to
* extents follows.
*/
blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
dirdata_bh = sb_getblk(sb, blkno);
if (!dirdata_bh) {
ret = -ENOMEM;
mlog_errno(ret);
goto out_commit;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dirdata_bh);
ret = ocfs2_journal_access_db(handle, INODE_CACHE(dir), dirdata_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
memcpy(dirdata_bh->b_data, di->id2.i_data.id_data, i_size_read(dir));
memset(dirdata_bh->b_data + i_size_read(dir), 0,
sb->s_blocksize - i_size_read(dir));
i = ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir), dir);
if (ocfs2_new_dir_wants_trailer(dir)) {
/*
* Prepare the dir trailer up front. It will otherwise look
* like a valid dirent. Even if inserting the index fails
* (unlikely), then all we'll have done is given first dir
* block a small amount of fragmentation.
*/
ocfs2_init_dir_trailer(dir, dirdata_bh, i);
}
ocfs2_update_inode_fsync_trans(handle, dir, 1);
ocfs2_journal_dirty(handle, dirdata_bh);
if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) {
/*
* Dx dirs with an external cluster need to do this up
* front. Inline dx root's get handled later, after
* we've allocated our root block. We get passed back
* a total number of items so that dr_num_entries can
* be correctly set once the dx_root has been
* allocated.
*/
ret = ocfs2_dx_dir_index_block(dir, handle, dx_leaves,
num_dx_leaves, &num_dx_entries,
dirdata_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
}
/*
* Set extent, i_size, etc on the directory. After this, the
* inode should contain the same exact dirents as before and
* be fully accessible from system calls.
*
* We let the later dirent insert modify c/mtime - to the user
* the data hasn't changed.
*/
ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
spin_lock(&oi->ip_lock);
oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL;
di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
spin_unlock(&oi->ip_lock);
ocfs2_dinode_new_extent_list(dir, di);
i_size_write(dir, sb->s_blocksize);
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
di->i_size = cpu_to_le64(sb->s_blocksize);
di->i_ctime = di->i_mtime = cpu_to_le64(dir->i_ctime.tv_sec);
di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(dir->i_ctime.tv_nsec);
ocfs2_update_inode_fsync_trans(handle, dir, 1);
/*
* This should never fail as our extent list is empty and all
* related blocks have been journaled already.
*/
ret = ocfs2_insert_extent(handle, &et, 0, blkno, len,
0, NULL);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
/*
* Set i_blocks after the extent insert for the most up to
* date ip_clusters value.
*/
dir->i_blocks = ocfs2_inode_sector_count(dir);
ocfs2_journal_dirty(handle, di_bh);
if (ocfs2_supports_indexed_dirs(osb)) {
ret = ocfs2_dx_dir_attach_index(osb, handle, dir, di_bh,
dirdata_bh, meta_ac, dx_inline,
num_dx_entries, &dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
if (dx_inline) {
ocfs2_dx_dir_index_root_block(dir, dx_root_bh,
dirdata_bh);
} else {
ocfs2_init_dx_root_extent_tree(&dx_et,
INODE_CACHE(dir),
dx_root_bh);
ret = ocfs2_insert_extent(handle, &dx_et, 0,
dx_insert_blkno, 1, 0, NULL);
if (ret)
mlog_errno(ret);
}
}
/*
* We asked for two clusters, but only got one in the 1st
* pass. Claim the 2nd cluster as a separate extent.
*/
if (alloc > len) {
ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off,
&len);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
ret = ocfs2_insert_extent(handle, &et, 1,
blkno, len, 0, NULL);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
}
*first_block_bh = dirdata_bh;
dirdata_bh = NULL;
if (ocfs2_supports_indexed_dirs(osb)) {
unsigned int off;
if (!dx_inline) {
/*
* We need to return the correct block within the
* cluster which should hold our entry.
*/
off = ocfs2_dx_dir_hash_idx(OCFS2_SB(dir->i_sb),
&lookup->dl_hinfo);
get_bh(dx_leaves[off]);
lookup->dl_dx_leaf_bh = dx_leaves[off];
}
lookup->dl_dx_root_bh = dx_root_bh;
dx_root_bh = NULL;
}
out_commit:
if (ret < 0 && did_quota)
dquot_free_space_nodirty(dir, bytes_allocated);
ocfs2_commit_trans(osb, handle);
out:
up_write(&oi->ip_alloc_sem);
if (data_ac)
ocfs2_free_alloc_context(data_ac);
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
if (dx_leaves) {
for (i = 0; i < num_dx_leaves; i++)
brelse(dx_leaves[i]);
kfree(dx_leaves);
}
brelse(dirdata_bh);