/* -*- 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 Linux 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>
#define MLOG_MASK_PREFIX ML_NAMEI
#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 "buffer_head_io.h"
#define NAMEI_RA_CHUNKS 2
#define NAMEI_RA_BLOCKS 4
#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
#define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
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);
/*
* 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_dir_has_trailer(struct inode *dir)
{
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return 0;
return ocfs2_meta_ecc(OCFS2_SB(dir->i_sb));
}
static int ocfs2_supports_dir_trailer(struct ocfs2_super *osb)
{
return ocfs2_meta_ecc(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_dir_has_trailer(dir))
return 0;
if (offset != toff)
return 0;
return 1;
}
static void ocfs2_init_dir_trailer(struct inode *inode,
struct buffer_head *bh)
{
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);
}
void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res)
{
brelse(res->dl_leaf_bh);
brelse(res->dl_dx_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;
}
/*
* 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 (rlen < OCFS2_DIR_REC_LEN(1))
error_msg = "rec_len is smaller than minimal";
else if (rlen % 4 != 0)
error_msg = "rec_len % 4 != 0";
else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
error_msg = "rec_len is too small for name_len";
else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
error_msg = "directory entry across blocks";
if (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 int inline 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;
mlog_entry_void();
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:
mlog_exit(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.
*/
mlog(0, "Validating dirblock %llu\n",
(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 = -EINVAL;
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 = -EINVAL;
ocfs2_error(dir->i_sb,
"Directory block #%llu has an invalid "
"db_blkno of %llu",
(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 = -EINVAL;
ocfs2_error(dir->i_sb,
"Directory block #%llu on dinode "
"#%llu has an invalid parent_dinode "
"of %llu",
(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_dir_has_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(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)) {
ocfs2_error(sb,
"Dir Index Root # %llu has bad signature %.*s",
(unsigned long long)le64_to_cpu(dx_root->dr_blkno),
7, dx_root->dr_signature);
return -EINVAL;
}
return 0;
}
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(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)) {
ocfs2_error(sb, "Dir Index Leaf has bad signature %.*s",
7, dx_leaf->dl_signature);
return -EROFS;
}
return 0;
}
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(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(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;
mlog_entry_void();
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. */
ocfs2_error(dir->i_sb, "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]);
mlog_exit_ptr(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, 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) {
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);
ret = -EROFS;
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) {
ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
"record (%u, %u, 0) in btree", inode->i_ino,
le32_to_cpu(rec->e_cpos),
ocfs2_rec_clusters(el, rec));
ret = -EROFS;
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 unsigned int ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb,
struct ocfs2_dx_hinfo *hinfo)
{
u32 minor_hash = hinfo->minor_hash;
return minor_hash & osb->osb_dx_mask;
}
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_extent_list *dr_el,
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;
ocfs2_dx_dir_name_hash(dir, name, namelen, &res->dl_hinfo);
ret = ocfs2_dx_dir_lookup(dir, dr_el, hinfo, NULL, &phys);
if (ret) {
mlog_errno(ret);
goto out;
}
mlog(0, "Dir %llu: name: \"%.*s\", lookup of hash: %u.0x%x "
"returns: %llu\n",
(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;
mlog(0, "leaf info: num_used: %d, count: %d\n",
le16_to_cpu(dx_leaf->dl_list.de_num_used),
le16_to_cpu(dx_leaf->dl_list.de_count));
/*
* Empty leaf is legal, so no need to check for that.
*/
found = 0;
for (i = 0; i < le16_to_cpu(dx_leaf->dl_list.de_num_used); i++) {
dx_entry = &dx_leaf->dl_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->dr_list,
lookup);
if (ret) {
if (ret != -ENOENT)
mlog_errno(ret);
goto out;
}
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, 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;
mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
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, 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));
else
de->inode = 0;
dir->i_version++;
status = 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:
mlog_exit(status);
return status;
}
static void ocfs2_dx_leaf_remove_entry(struct ocfs2_dx_leaf *dx_leaf, int index)
{
struct ocfs2_dx_entry_list *dl_list = &dx_leaf->dl_list;
int num_used = le16_to_cpu(dl_list->de_num_used);
if (num_used == 1 || index == (num_used - 1))
goto clear;
memmove(&dl_list->de_entries[index], &dl_list->de_entries[index + 1],
(num_used - index - 1)*sizeof(struct ocfs2_dx_entry));
clear:
num_used--;
memset(&dl_list->de_entries[num_used], 0,
sizeof(struct ocfs2_dx_entry));
dl_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;
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;
dx_leaf = (struct ocfs2_dx_leaf *) lookup->dl_dx_leaf_bh->b_data;
/* Neither of these are a disk corruption - that should have
* been caught by lookup, before we got here. */
BUG_ON(le16_to_cpu(dx_leaf->dl_list.de_count) <= 0);
BUG_ON(le16_to_cpu(dx_leaf->dl_list.de_num_used) <= 0);
index = (char *)dx_entry - (char *)dx_leaf->dl_list.de_entries;
index /= sizeof(*dx_entry);
if (index >= le16_to_cpu(dx_leaf->dl_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, dx_leaf,
dx_entry);
return -EIO;
}
mlog(0, "Dir %llu: delete entry at index: %d\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno, index);
/*
* Add the index leaf 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.
*/
ret = ocfs2_journal_access_dl(handle, dir, lookup->dl_dx_leaf_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
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;
}
ocfs2_dx_leaf_remove_entry(dx_leaf, index);
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 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, i;
struct ocfs2_dx_entry *dx_entry;
struct ocfs2_dx_leaf *dx_leaf;
ret = ocfs2_journal_access_dl(handle, 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;
i = le16_to_cpu(dx_leaf->dl_list.de_num_used);
dx_entry = &dx_leaf->dl_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(&dx_leaf->dl_list.de_num_used, 1);
ocfs2_journal_dirty(handle, dx_leaf_bh);
out:
return ret;
}
static int ocfs2_dx_dir_leaf_insert(struct inode *dir, handle_t *handle,
struct ocfs2_dir_lookup_result *lookup)
{
return __ocfs2_dx_dir_leaf_insert(dir, handle, &lookup->dl_hinfo,
lookup->dl_leaf_bh->b_blocknr,
lookup->dl_dx_leaf_bh);
}
/* 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, status;
unsigned int size = sb->s_blocksize;
struct buffer_head *insert_bh = lookup->dl_leaf_bh;
char *data_start = insert_bh->b_data;
mlog_entry_void();
if (!namelen)
return -EINVAL;
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)
status = ocfs2_journal_access_di(handle, dir,
insert_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
else {
status = ocfs2_journal_access_db(handle, dir,
insert_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ocfs2_dir_indexed(dir)) {
status = ocfs2_dx_dir_leaf_insert(dir,
handle,
lookup);
if (status) {
mlog_errno(status);
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);
dir->i_version++;
status = 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:
mlog_exit(retval);
return retval;
}
static int ocfs2_dir_foreach_blk_id(struct inode *inode,
u64 *f_version,
loff_t *f_pos, void *priv,
filldir_t filldir, int *filldir_err)
{
int ret, i, filldir_ret;
unsigned long offset = *f_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 (*f_pos < i_size_read(inode)) {
revalidate:
/* 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);
}
*f_pos = offset = i;
*f_version = inode->i_version;
}
de = (struct ocfs2_dir_entry *) (data->id_data + *f_pos);
if (!ocfs2_check_dir_entry(inode, de, di_bh, *f_pos)) {
/* On error, skip the f_pos to the end. */
*f_pos = i_size_read(inode);
goto out;
}
offset += le16_to_cpu(de->rec_len);
if (le64_to_cpu(de->inode)) {
/* We might block in the next section
* if the data destination is
* currently swapped out. So, use a
* version stamp to detect whether or
* not the directory has been modified
* during the copy operation.
*/
u64 version = *f_version;
unsigned char d_type = DT_UNKNOWN;
if (de->file_type < OCFS2_FT_MAX)
d_type = ocfs2_filetype_table[de->file_type];
filldir_ret = filldir(priv, de->name,
de->name_len,
*f_pos,
le64_to_cpu(de->inode),
d_type);
if (filldir_ret) {
if (filldir_err)
*filldir_err = filldir_ret;
break;
}
if (version != *f_version)
goto revalidate;
}
*f_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,
loff_t *f_pos, void *priv,
filldir_t filldir, int *filldir_err)
{
int error = 0;
unsigned long offset, blk, last_ra_blk = 0;
int i, stored;
struct buffer_head * bh, * tmp;
struct ocfs2_dir_entry * de;
struct super_block * sb = inode->i_sb;
unsigned int ra_sectors = 16;
stored = 0;
bh = NULL;
offset = (*f_pos) & (sb->s_blocksize - 1);
while (!error && !stored && *f_pos < i_size_read(inode)) {
blk = (*f_pos) >> sb->s_blocksize_bits;
if (ocfs2_read_dir_block(inode, blk, &bh, 0)) {
/* Skip the corrupt dirblock and keep trying */
*f_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;
}
revalidate:
/* 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;
*f_pos = ((*f_pos) & ~(sb->s_blocksize - 1))
| offset;
*f_version = inode->i_version;
}
while (!error && *f_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. */
*f_pos = ((*f_pos) | (sb->s_blocksize - 1)) + 1;
brelse(bh);
goto out;
}
offset += le16_to_cpu(de->rec_len);
if (le64_to_cpu(de->inode)) {
/* We might block in the next section
* if the data destination is
* currently swapped out. So, use a
* version stamp to detect whether or
* not the directory has been modified
* during the copy operation.
*/
unsigned long version = *f_version;
unsigned char d_type = DT_UNKNOWN;
if (de->file_type < OCFS2_FT_MAX)
d_type = ocfs2_filetype_table[de->file_type];
error = filldir(priv, de->name,
de->name_len,
*f_pos,
le64_to_cpu(de->inode),
d_type);
if (error) {
if (filldir_err)
*filldir_err = error;
break;
}
if (version != *f_version)
goto revalidate;
stored ++;
}
*f_pos += le16_to_cpu(de->rec_len);
}
offset = 0;
brelse(bh);
bh = NULL;
}
stored = 0;
out:
return stored;
}
static int ocfs2_dir_foreach_blk(struct inode *inode, u64 *f_version,
loff_t *f_pos, void *priv, filldir_t filldir,
int *filldir_err)
{
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return ocfs2_dir_foreach_blk_id(inode, f_version, f_pos, priv,
filldir, filldir_err);
return ocfs2_dir_foreach_blk_el(inode, f_version, f_pos, priv, filldir,
filldir_err);
}
/*
* This is intended to be called from inside other kernel functions,
* so we fake some arguments.
*/
int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv,
filldir_t filldir)
{
int ret = 0, filldir_err = 0;
u64 version = inode->i_version;
while (*f_pos < i_size_read(inode)) {
ret = ocfs2_dir_foreach_blk(inode, &version, f_pos, priv,
filldir, &filldir_err);
if (ret || filldir_err)
break;
}
if (ret > 0)
ret = -EIO;
return 0;
}
/*
* ocfs2_readdir()
*
*/
int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir)
{
int error = 0;
struct inode *inode = filp->f_path.dentry->d_inode;
int lock_level = 0;
mlog_entry("dirino=%llu\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno);
error = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &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, &filp->f_version, &filp->f_pos,
dirent, filldir, NULL);
ocfs2_inode_unlock(inode, lock_level);
bail_nolock:
mlog_exit(error);
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;
mlog(0, "name=%.*s, blkno=%p, inode=%llu\n", 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;
struct ocfs2_dir_lookup_result lookup = { NULL, };
mlog_entry("dir %llu, name '%.*s'\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name);
ret = -EEXIST;
if (ocfs2_find_entry(name, namelen, dir, &lookup) == 0)
goto bail;
ret = 0;
bail:
ocfs2_free_dir_lookup_result(&lookup);
mlog_exit(ret);
return ret;
}
struct ocfs2_empty_dir_priv {
unsigned seen_dot;
unsigned seen_dot_dot;
unsigned seen_other;
};
static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len,
loff_t pos, u64 ino, unsigned type)
{
struct ocfs2_empty_dir_priv *p = priv;
/*
* Check the positions of "." and ".." records to be sure
* they're in the correct place.
*/
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;
return 0;
}
p->seen_other = 1;
return 1;
}
/*
* 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
*/
int ocfs2_empty_dir(struct inode *inode)
{
int ret;
loff_t start = 0;
struct ocfs2_empty_dir_priv priv;
memset(&priv, 0, sizeof(priv));
ret = ocfs2_dir_foreach(inode, &start, &priv, ocfs2_empty_dir_filldir);
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, 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);
if (ret) {
mlog_errno(ret);
goto out;
}
i_size_write(inode, size);
inode->i_nlink = 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;
mlog_entry_void();
if (ocfs2_supports_dir_trailer(osb))
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, new_bh);
status = ocfs2_journal_access_db(handle, 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_supports_dir_trailer(osb))
ocfs2_init_dir_trailer(inode, new_bh);
status = ocfs2_journal_dirty(handle, new_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
i_size_write(inode, inode->i_sb->s_blocksize);
inode->i_nlink = 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);
mlog_exit(status);
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 ocfs2_alloc_context *meta_ac,
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 dr_blkno;
unsigned int num_bits;
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dx_root_block *dx_root;
ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, &dr_suballoc_bit,
&num_bits, &dr_blkno);
if (ret) {
mlog_errno(ret);
goto out;
}
mlog(0, "Dir %llu, attach new index block: %llu\n",
(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 = -EIO;
goto out;
}
ocfs2_set_new_buffer_uptodate(dir, dx_root_bh);
ret = ocfs2_journal_access_dr(handle, 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(osb->slot_num);
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_list.l_count =
cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb));
ret = ocfs2_journal_dirty(handle, dx_root_bh);
if (ret)
mlog_errno(ret);
ret = ocfs2_journal_access_di(handle, dir, di_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret) {
mlog_errno(ret);
goto out;
}
di->i_dx_root = cpu_to_le64(dr_blkno);
OCFS2_I(dir)->ip_dyn_features |= OCFS2_INDEXED_DIR_FL;
di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
ret = ocfs2_journal_dirty(handle, di_bh);
if (ret)
mlog_errno(ret);
*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 = -EIO;
goto out;
}
dx_leaves[i] = bh;
ocfs2_set_new_buffer_uptodate(dir, bh);
ret = ocfs2_journal_access_dl(handle, 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));
mlog(0,
"Dir %llu, format dx_leaf: %llu, entry count: %u\n",
(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(osb, 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;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
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(osb, handle, dir, 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, num_dx_leaves, i;
struct buffer_head *leaf_bh = NULL;
struct buffer_head *dx_root_bh = NULL;
struct buffer_head **dx_leaves = NULL;
struct ocfs2_extent_tree et;
struct ocfs2_dx_hinfo hinfo;
u64 insert_blkno;
dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, &num_dx_leaves);
if (!dx_leaves) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
/*
* 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.
*/
ret = ocfs2_fill_new_dir_el(osb, handle, parent, inode, di_bh,
data_ac, &leaf_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* Allocate and format the index leaf first, before attaching
* the index root. That way we're sure that the main bitmap
* won't -enospc on us with a half-created dir index.
*
* The meta data allocation for our index block will not
* -enospc on us unless there is a disk corruption.
*/
ret = __ocfs2_dx_dir_new_cluster(inode, 0, handle, data_ac, dx_leaves,
num_dx_leaves, &insert_blkno);
if (ret) {
mlog_errno(ret);
goto out;
}
ocfs2_dx_dir_name_hash(inode, ".", 1, &hinfo);
i = ocfs2_dx_dir_hash_idx(osb, &hinfo);
ret = __ocfs2_dx_dir_leaf_insert(inode, handle, &hinfo,
leaf_bh->b_blocknr, dx_leaves[i]);
if (ret) {
mlog_errno(ret);
goto out;
}
ocfs2_dx_dir_name_hash(inode, "..", 2, &hinfo);
i = ocfs2_dx_dir_hash_idx(osb, &hinfo);
ret = __ocfs2_dx_dir_leaf_insert(inode, handle, &hinfo,
leaf_bh->b_blocknr, dx_leaves[i]);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_dx_dir_attach_index(osb, handle, inode, di_bh, meta_ac,
&dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
/* This should never fail considering we start with an empty
* dx_root. */
ocfs2_init_dx_root_extent_tree(&et, inode, dx_root_bh);
ret = ocfs2_insert_extent(osb, handle, inode, &et, 0,
insert_blkno, 1, 0, NULL);
if (ret)
mlog_errno(ret);
out:
if (dx_leaves) {
for (i = 0; i < num_dx_leaves; i++)
brelse(dx_leaves[i]);
kfree(dx_leaves);
}
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,
struct buffer_head *dirent_bh)
{
int ret, 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;
}
inc:
de_buf += le16_to_cpu(de->rec_len);
}
out:
return ret;
}
/*
* 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.
*
* We add the dir trailer if this filesystem wants it.
*/
static void ocfs2_expand_last_dirent(char *start, unsigned int old_size,
struct super_block *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;
if (ocfs2_supports_dir_trailer(OCFS2_SB(sb)))
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 {
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 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;
struct super_block *sb = dir->i_sb;
int ret, i, num_dx_leaves = 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;
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, dir, di_bh);
alloc = ocfs2_clusters_for_bytes(sb, bytes);
dx_alloc = 0;
if (ocfs2_supports_indexed_dirs(osb)) {
/* Add one more cluster for an index leaf */
dx_alloc++;
credits += ocfs2_add_dir_index_credits(sb);
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, &data_ac);
if (ret) {
mlog_errno(ret);
goto out;
}
down_write(&oi->ip_alloc_sem);
/*
* 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_sem;
}
if (vfs_dq_alloc_space_nodirty(dir,
ocfs2_clusters_to_bytes(osb->sb,
alloc + dx_alloc))) {
ret = -EDQUOT;
goto out_commit;
}
did_quota = 1;
if (ocfs2_supports_indexed_dirs(osb)) {
/*
* 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.
*/
ret = ocfs2_claim_clusters(osb, 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 = -EIO;
mlog_errno(ret);
goto out_commit;
}
ocfs2_set_new_buffer_uptodate(dir, dirdata_bh);
ret = ocfs2_journal_access_db(handle, 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));
ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir), sb);
if (ocfs2_supports_dir_trailer(osb))
ocfs2_init_dir_trailer(dir, dirdata_bh);
ret = ocfs2_journal_dirty(handle, dirdata_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
if (ocfs2_supports_indexed_dirs(osb)) {
ret = ocfs2_dx_dir_index_block(dir, handle, dx_leaves,
num_dx_leaves, 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, 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);
/*
* This should never fail as our extent list is empty and all
* related blocks have been journaled already.
*/
ret = ocfs2_insert_extent(osb, handle, dir, &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);
ret = ocfs2_journal_dirty(handle, di_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
if (ocfs2_supports_indexed_dirs(osb)) {
ret = ocfs2_dx_dir_attach_index(osb, handle, dir, di_bh,
meta_ac, &dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ocfs2_init_dx_root_extent_tree(&dx_et, dir, dx_root_bh);
ret = ocfs2_insert_extent(osb, handle, dir, &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(osb, 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(osb, handle, dir, &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;
/*
* 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];
}
out_commit:
if (ret < 0 && did_quota)
vfs_dq_free_space_nodirty(dir, bytes_allocated);
ocfs2_commit_trans(osb, handle);
out_sem:
up_write(&oi->ip_alloc_sem);
out:
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);
brelse(dx_root_bh);
return ret;
}
/* returns a bh of the 1st new block in the allocation. */
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)
{
int status;
int extend, did_quota = 0;
u64 p_blkno, v_blkno;
spin_lock(&OCFS2_I(dir)->ip_lock);
extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters));
spin_unlock(&OCFS2_I(dir)->ip_lock);
if (extend) {
u32 offset = OCFS2_I(dir)->ip_clusters;
if (vfs_dq_alloc_space_nodirty(dir,
ocfs2_clusters_to_bytes(sb, 1))) {
status = -EDQUOT;
goto bail;
}
did_quota = 1;
status = ocfs2_add_inode_data(OCFS2_SB(sb), dir, &offset,
1, 0, parent_fe_bh, handle,
data_ac, meta_ac, NULL);
BUG_ON(status == -EAGAIN);
if (status < 0) {
mlog_errno(status);
goto bail;
}
}
v_blkno = ocfs2_blocks_for_bytes(sb, i_size_read(dir));
status = ocfs2_extent_map_get_blocks(dir, v_blkno, &p_blkno, NULL, NULL);
if (status < 0) {
mlog_errno(status);
goto bail;
}
*new_bh = sb_getblk(sb, p_blkno);
if (!*new_bh) {
status = -EIO;
mlog_errno(status);
goto bail;
}
status = 0;
bail:
if (did_quota && status < 0)
vfs_dq_free_space_nodirty(dir, ocfs2_clusters_to_bytes(sb, 1));
mlog_exit(status);
return status;
}
/*
* Assumes you already have a cluster lock on the directory.
*
* 'blocks_wanted' is only used if we have an inline directory which
* is to be turned into an extent based one. The size of the dirent to
* insert might be larger than the space gained by growing to just one
* block, so we may have to grow the inode by two blocks in that case.
*/
static int ocfs2_extend_dir(struct ocfs2_super *osb,
struct inode *dir,
struct buffer_head *parent_fe_bh,
unsigned int blocks_wanted,
struct ocfs2_dir_lookup_result *lookup,
struct buffer_head **new_de_bh)
{
int status = 0;
int credits, num_free_extents, drop_alloc_sem = 0;
loff_t dir_i_size;
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
struct ocfs2_extent_list *el = &fe->id2.i_list;
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_alloc_context *meta_ac = NULL;
handle_t *handle = NULL;
struct buffer_head *new_bh = NULL;
struct ocfs2_dir_entry * de;
struct super_block *sb = osb->sb;
struct ocfs2_extent_tree et;
mlog_entry_void();
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
status = ocfs2_expand_inline_dir(dir, parent_fe_bh,
blocks_wanted, lookup,
&new_bh);
if (status) {
mlog_errno(status);
goto bail;
}
if (blocks_wanted == 1) {
/*
* If the new dirent will fit inside the space
* created by pushing out to one block, then
* we can complete the operation
* here. Otherwise we have to expand i_size
* and format the 2nd block below.
*/
BUG_ON(new_bh == NULL);
goto bail_bh;
}
/*
* Get rid of 'new_bh' - we want to format the 2nd
* data block and return that instead.
*/
brelse(new_bh);
new_bh = NULL;
dir_i_size = i_size_read(dir);
credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
goto do_extend;
}
dir_i_size = i_size_read(dir);
mlog(0, "extending dir %llu (i_size = %lld)\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size);
/* dir->i_size is always block aligned. */
spin_lock(&OCFS2_I(dir)->ip_lock);
if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {
spin_unlock(&OCFS2_I(dir)->ip_lock);
ocfs2_init_dinode_extent_tree(&et, dir, parent_fe_bh);
num_free_extents = ocfs2_num_free_extents(osb, dir, &et);
if (num_free_extents < 0) {
status = num_free_extents;
mlog_errno(status);
goto bail;
}
if (!num_free_extents) {
status = ocfs2_reserve_new_metadata(osb, el, &meta_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail;
}
}
status = ocfs2_reserve_clusters(osb, 1, &data_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail;
}
credits = ocfs2_calc_extend_credits(sb, el, 1);
} else {
spin_unlock(&OCFS2_I(dir)->ip_lock);
credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
}
do_extend:
down_write(&OCFS2_I(dir)->ip_alloc_sem);
drop_alloc_sem = 1;
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto bail;
}
status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh,
data_ac, meta_ac, &new_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
ocfs2_set_new_buffer_uptodate(dir, new_bh);
status = ocfs2_journal_access_db(handle, dir, new_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (status < 0) {
mlog_errno(status);
goto bail;
}
memset(new_bh->b_data, 0, sb->s_blocksize);
de = (struct ocfs2_dir_entry *) new_bh->b_data;
de->inode = 0;
if (ocfs2_dir_has_trailer(dir)) {
de->rec_len = cpu_to_le16(ocfs2_dir_trailer_blk_off(sb));
ocfs2_init_dir_trailer(dir, new_bh);
} else {
de->rec_len = cpu_to_le16(sb->s_blocksize);
}
status = ocfs2_journal_dirty(handle, new_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
dir_i_size += dir->i_sb->s_blocksize;
i_size_write(dir, dir_i_size);
dir->i_blocks = ocfs2_inode_sector_count(dir);
status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
bail_bh:
*new_de_bh = new_bh;
get_bh(*new_de_bh);
bail:
if (drop_alloc_sem)
up_write(&OCFS2_I(dir)->ip_alloc_sem);
if (handle)
ocfs2_commit_trans(osb, handle);
if (data_ac)
ocfs2_free_alloc_context(data_ac);
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
brelse(new_bh);
mlog_exit(status);
return status;
}
static int ocfs2_find_dir_space_id(struct inode *dir, struct buffer_head *di_bh,
const char *name, int namelen,
struct buffer_head **ret_de_bh,
unsigned int *blocks_wanted)
{
int ret;
struct super_block *sb = dir->i_sb;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
struct ocfs2_dir_entry *de, *last_de = NULL;
char *de_buf, *limit;
unsigned long offset = 0;
unsigned int rec_len, new_rec_len, free_space = dir->i_sb->s_blocksize;
/*
* This calculates how many free bytes we'd have in block zero, should
* this function force expansion to an extent tree.
*/
if (ocfs2_supports_dir_trailer(OCFS2_SB(sb)))
free_space = ocfs2_dir_trailer_blk_off(sb) - i_size_read(dir);
else
free_space = dir->i_sb->s_blocksize - i_size_read(dir);
de_buf = di->id2.i_data.id_data;
limit = de_buf + i_size_read(dir);
rec_len = OCFS2_DIR_REC_LEN(namelen);
while (de_buf < limit) {
de = (struct ocfs2_dir_entry *)de_buf;
if (!ocfs2_check_dir_entry(dir, de, di_bh, offset)) {
ret = -ENOENT;
goto out;
}
if (ocfs2_match(namelen, name, de)) {
ret = -EEXIST;
goto out;
}
/*
* No need to check for a trailing dirent record here as
* they're not used for inline dirs.
*/
if (ocfs2_dirent_would_fit(de, rec_len)) {
/* Ok, we found a spot. Return this bh and let
* the caller actually fill it in. */
*ret_de_bh = di_bh;
get_bh(*ret_de_bh);
ret = 0;
goto out;
}
last_de = de;
de_buf += le16_to_cpu(de->rec_len);
offset += le16_to_cpu(de->rec_len);
}
/*
* We're going to require expansion of the directory - figure
* out how many blocks we'll need so that a place for the
* dirent can be found.
*/
*blocks_wanted = 1;
new_rec_len = le16_to_cpu(last_de->rec_len) + free_space;
if (new_rec_len < (rec_len + OCFS2_DIR_REC_LEN(last_de->name_len)))
*blocks_wanted = 2;
ret = -ENOSPC;
out:
return ret;
}
static int ocfs2_find_dir_space_el(struct inode *dir, const char *name,
int namelen, struct buffer_head **ret_de_bh)
{
unsigned long offset;
struct buffer_head *bh = NULL;
unsigned short rec_len;
struct ocfs2_dir_entry *de;
struct super_block *sb = dir->i_sb;
int status;
int blocksize = dir->i_sb->s_blocksize;
status = ocfs2_read_dir_block(dir, 0, &bh, 0);
if (status) {
mlog_errno(status);
goto bail;
}
rec_len = OCFS2_DIR_REC_LEN(namelen);
offset = 0;
de = (struct ocfs2_dir_entry *) bh->b_data;
while (1) {
if ((char *)de >= sb->s_blocksize + bh->b_data) {
brelse(bh);
bh = NULL;
if (i_size_read(dir) <= offset) {
/*
* Caller will have to expand this
* directory.
*/
status = -ENOSPC;
goto bail;
}
status = ocfs2_read_dir_block(dir,
offset >> sb->s_blocksize_bits,
&bh, 0);
if (status) {
mlog_errno(status);
goto bail;
}
/* move to next block */
de = (struct ocfs2_dir_entry *) bh->b_data;
}
if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
status = -ENOENT;
goto bail;
}
if (ocfs2_match(namelen, name, de)) {
status = -EEXIST;
goto bail;
}
if (ocfs2_skip_dir_trailer(dir, de, offset % blocksize,
blocksize))
goto next;
if (ocfs2_dirent_would_fit(de, rec_len)) {
/* Ok, we found a spot. Return this bh and let
* the caller actually fill it in. */
*ret_de_bh = bh;
get_bh(*ret_de_bh);
status = 0;
goto bail;
}
next:
offset += le16_to_cpu(de->rec_len);
de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len));
}
status = 0;
bail:
brelse(bh);
mlog_exit(status);
return status;
}
static int dx_leaf_sort_cmp(const void *a, const void *b)
{
const struct ocfs2_dx_entry *entry1 = a;
const struct ocfs2_dx_entry *entry2 = b;
u32 major_hash1 = le32_to_cpu(entry1->dx_major_hash);
u32 major_hash2 = le32_to_cpu(entry2->dx_major_hash);
u32 minor_hash1 = le32_to_cpu(entry1->dx_minor_hash);
u32 minor_hash2 = le32_to_cpu(entry2->dx_minor_hash);
if (major_hash1 > major_hash2)
return 1;
if (major_hash1 < major_hash2)
return -1;
/*
* It is not strictly necessary to sort by minor
*/
if (minor_hash1 > minor_hash2)
return 1;
if (minor_hash1 < minor_hash2)
return -1;
return 0;
}
static void dx_leaf_sort_swap(void *a, void *b, int size)
{
struct ocfs2_dx_entry *entry1 = a;
struct ocfs2_dx_entry *entry2 = b;
struct ocfs2_dx_entry tmp;
BUG_ON(size != sizeof(*entry1));
tmp = *entry1;
*entry1 = *entry2;
*entry2 = tmp;
}
static int ocfs2_dx_leaf_same_major(struct ocfs2_dx_leaf *dx_leaf)
{
struct ocfs2_dx_entry_list *dl_list = &dx_leaf->dl_list;
int i, num = le16_to_cpu(dl_list->de_num_used);
for (i = 0; i < (num - 1); i++) {
if (le32_to_cpu(dl_list->de_entries[i].dx_major_hash) !=
le32_to_cpu(dl_list->de_entries[i + 1].dx_major_hash))
return 0;
}
return 1;
}
/*
* Find the optimal value to split this leaf on. This expects the leaf
* entries to be in sorted order.
*
* leaf_cpos is the cpos of the leaf we're splitting. insert_hash is
* the hash we want to insert.
*
* This function is only concerned with the major hash - that which
* determines which cluster an item belongs to.
*/
static int ocfs2_dx_dir_find_leaf_split(struct ocfs2_dx_leaf *dx_leaf,
u32 leaf_cpos, u32 insert_hash,
u32 *split_hash)
{
struct ocfs2_dx_entry_list *dl_list = &dx_leaf->dl_list;
int i, num_used = le16_to_cpu(dl_list->de_num_used);
int allsame;
/*
* There's a couple rare, but nasty corner cases we have to
* check for here. All of them involve a leaf where all value
* have the same hash, which is what we look for first.
*
* Most of the time, all of the above is false, and we simply
* pick the median value for a split.
*/
allsame = ocfs2_dx_leaf_same_major(dx_leaf);
if (allsame) {
u32 val = le32_to_cpu(dl_list->de_entries[0].dx_major_hash);
if (val == insert_hash) {
/*
* No matter where we would choose to split,
* the new entry would want to occupy the same
* block as these. Since there's no space left
* in their existing block, we know there
* won't be space after the split.
*/
return -ENOSPC;
}
if (val == leaf_cpos) {
/*
* Because val is the same as leaf_cpos (which
* is the smallest value this leaf can have),
* yet is not equal to insert_hash, then we
* know that insert_hash *must* be larger than
* val (and leaf_cpos). At least cpos+1 in value.
*
* We also know then, that there cannot be an
* adjacent extent (otherwise we'd be looking
* at it). Choosing this value gives us a
* chance to get some contiguousness.
*/
*split_hash = leaf_cpos + 1;
return 0;
}
if (val > insert_hash) {
/*
* val can not be the same as insert hash, and
* also must be larger than leaf_cpos. Also,
* we know that there can't be a leaf between
* cpos and val, otherwise the entries with
* hash 'val' would be there.
*/
*split_hash = val;
return 0;
}
*split_hash = insert_hash;
return 0;
}
/*
* Since the records are sorted and the checks above
* guaranteed that not all records in this block are the same,
* we simple travel forward, from the median, and pick the 1st
* record whose value is larger than leaf_cpos.
*/
for (i = (num_used / 2); i < num_used; i++)
if (le32_to_cpu(dl_list->de_entries[i].dx_major_hash) >
leaf_cpos)
break;
BUG_ON(i == num_used); /* Should be impossible */
*split_hash = le32_to_cpu(dl_list->de_entries[i].dx_major_hash);
return 0;
}
/*
* Transfer all entries in orig_dx_leaves whose major hash is equal to or
* larger than split_hash into new_dx_leaves. We use a temporary
* buffer (tmp_dx_leaf) to make the changes to the original leaf blocks.
*
* Since the block offset inside a leaf (cluster) is a constant mask
* of minor_hash, we can optimize - an item at block offset X within
* the original cluster, will be at offset X within the new cluster.
*/
static void ocfs2_dx_dir_transfer_leaf(struct inode *dir, u32 split_hash,
handle_t *handle,
struct ocfs2_dx_leaf *tmp_dx_leaf,
struct buffer_head **orig_dx_leaves,
struct buffer_head **new_dx_leaves,
int num_dx_leaves)
{
int i, j, num_used;
u32 major_hash;
struct ocfs2_dx_leaf *orig_dx_leaf, *new_dx_leaf;
struct ocfs2_dx_entry_list *orig_list, *new_list, *tmp_list;
struct ocfs2_dx_entry *dx_entry;
tmp_list = &tmp_dx_leaf->dl_list;
for (i = 0; i < num_dx_leaves; i++) {
orig_dx_leaf = (struct ocfs2_dx_leaf *) orig_dx_leaves[i]->b_data;
orig_list = &orig_dx_leaf->dl_list;
new_dx_leaf = (struct ocfs2_dx_leaf *) new_dx_leaves[i]->b_data;
new_list = &new_dx_leaf->dl_list;
num_used = le16_to_cpu(orig_list->de_num_used);
memcpy(tmp_dx_leaf, orig_dx_leaf, dir->i_sb->s_blocksize);
tmp_list->de_num_used = cpu_to_le16(0);
memset(&tmp_list->de_entries, 0, sizeof(*dx_entry)*num_used);
for (j = 0; j < num_used; j++) {
dx_entry = &orig_list->de_entries[j];
major_hash = le32_to_cpu(dx_entry->dx_major_hash);
if (major_hash >= split_hash)
ocfs2_dx_dir_leaf_insert_tail(new_dx_leaf,
dx_entry);
else
ocfs2_dx_dir_leaf_insert_tail(tmp_dx_leaf,
dx_entry);
}
memcpy(orig_dx_leaf, tmp_dx_leaf, dir->i_sb->s_blocksize);
ocfs2_journal_dirty(handle, orig_dx_leaves[i]);
ocfs2_journal_dirty(handle, new_dx_leaves[i]);
}
}
static int ocfs2_dx_dir_rebalance_credits(struct ocfs2_super *osb,
struct ocfs2_dx_root_block *dx_root)
{
int credits = ocfs2_clusters_to_blocks(osb->sb, 2);
credits += ocfs2_calc_extend_credits(osb->sb, &dx_root->dr_list, 1);
credits += ocfs2_quota_trans_credits(osb->sb);
return credits;
}
/*
* Find the median value in dx_leaf_bh and allocate a new leaf to move
* half our entries into.
*/
static int ocfs2_dx_dir_rebalance(struct ocfs2_super *osb, struct inode *dir,
struct buffer_head *dx_root_bh,
struct buffer_head *dx_leaf_bh,
struct ocfs2_dx_hinfo *hinfo, u32 leaf_cpos,
u64 leaf_blkno)
{
struct ocfs2_dx_leaf *dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data;
int credits, ret, i, num_used, did_quota = 0;
u32 cpos, split_hash, insert_hash = hinfo->major_hash;
u64 orig_leaves_start;
int num_dx_leaves;
struct buffer_head **orig_dx_leaves = NULL;
struct buffer_head **new_dx_leaves = NULL;
struct ocfs2_alloc_context *data_ac = NULL, *meta_ac = NULL;
struct ocfs2_extent_tree et;
handle_t *handle = NULL;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dx_leaf *tmp_dx_leaf = NULL;
mlog(0, "DX Dir: %llu, rebalance leaf leaf_blkno: %llu insert: %u\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long long)leaf_blkno, insert_hash);
ocfs2_init_dx_root_extent_tree(&et, dir, dx_root_bh);
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
/*
* XXX: This is a rather large limit. We should use a more
* realistic value.
*/
if (le32_to_cpu(dx_root->dr_clusters) == UINT_MAX)
return -ENOSPC;
num_used = le16_to_cpu(dx_leaf->dl_list.de_num_used);
if (num_used < le16_to_cpu(dx_leaf->dl_list.de_count)) {
mlog(ML_ERROR, "DX Dir: %llu, Asked to rebalance empty leaf: "
"%llu, %d\n", (unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long long)leaf_blkno, num_used);
ret = -EIO;
goto out;
}
orig_dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, &num_dx_leaves);
if (!orig_dx_leaves) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
new_dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, NULL);
if (!new_dx_leaves) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
ret = ocfs2_lock_allocators(dir, &et, 1, 0, &data_ac, &meta_ac);
if (ret) {
if (ret != -ENOSPC)
mlog_errno(ret);
goto out;
}
credits = ocfs2_dx_dir_rebalance_credits(osb, dx_root);
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
handle = NULL;
mlog_errno(ret);
goto out;
}
if (vfs_dq_alloc_space_nodirty(dir,
ocfs2_clusters_to_bytes(dir->i_sb, 1))) {
ret = -EDQUOT;
goto out_commit;
}
did_quota = 1;
ret = ocfs2_journal_access_dl(handle, dir, dx_leaf_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
/*
* This block is changing anyway, so we can sort it in place.
*/
sort(dx_leaf->dl_list.de_entries, num_used,
sizeof(struct ocfs2_dx_entry), dx_leaf_sort_cmp,
dx_leaf_sort_swap);
ret = ocfs2_journal_dirty(handle, dx_leaf_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_dx_dir_find_leaf_split(dx_leaf, leaf_cpos, insert_hash,
&split_hash);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
mlog(0, "Split leaf (%u) at %u, insert major hash is %u\n",
leaf_cpos, split_hash, insert_hash);
/*
* We have to carefully order operations here. There are items
* which want to be in the new cluster before insert, but in
* order to put those items in the new cluster, we alter the
* old cluster. A failure to insert gets nasty.
*
* So, start by reserving writes to the old
* cluster. ocfs2_dx_dir_new_cluster will reserve writes on
* the new cluster for us, before inserting it. The insert
* won't happen if there's an error before that. Once the
* insert is done then, we can transfer from one leaf into the
* other without fear of hitting any error.
*/
/*
* The leaf transfer wants some scratch space so that we don't
* wind up doing a bunch of expensive memmove().
*/
tmp_dx_leaf = kmalloc(osb->sb->s_blocksize, GFP_NOFS);
if (!tmp_dx_leaf) {
ret = -ENOMEM;
mlog_errno(ret);
goto out_commit;
}
orig_leaves_start = leaf_blkno & ~(osb->s_clustersize_bits -
osb->sb->s_blocksize_bits);
ret = ocfs2_read_dx_leaves(dir, orig_leaves_start, num_dx_leaves,
orig_dx_leaves);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
for (i = 0; i < num_dx_leaves; i++) {
ret = ocfs2_journal_access_dl(handle, dir, orig_dx_leaves[i],
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
}
cpos = split_hash;
ret = ocfs2_dx_dir_new_cluster(dir, &et, cpos, handle,
data_ac, meta_ac, new_dx_leaves,
num_dx_leaves);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ocfs2_dx_dir_transfer_leaf(dir, split_hash, handle, tmp_dx_leaf,
orig_dx_leaves, new_dx_leaves, num_dx_leaves);
out_commit:
if (ret < 0 && did_quota)
vfs_dq_free_space_nodirty(dir,
ocfs2_clusters_to_bytes(dir->i_sb, 1));
ocfs2_commit_trans(osb, handle);
out:
if (orig_dx_leaves || new_dx_leaves) {
for (i = 0; i < num_dx_leaves; i++) {
if (orig_dx_leaves)
brelse(orig_dx_leaves[i]);
if (new_dx_leaves)
brelse(new_dx_leaves[i]);
}
kfree(orig_dx_leaves);
kfree(new_dx_leaves);
}
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
if (data_ac)
ocfs2_free_alloc_context(data_ac);
kfree(tmp_dx_leaf);
return ret;
}
static int ocfs2_find_dir_space_dx(struct ocfs2_super *osb, struct inode *dir,
struct buffer_head *di_bh, const char *name,
int namelen,
struct ocfs2_dir_lookup_result *lookup)
{
int ret, rebalanced = 0;
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dx_root_block *dx_root;
struct buffer_head *dx_leaf_bh = NULL;
struct ocfs2_dx_leaf *dx_leaf;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
u64 blkno;
u32 leaf_cpos;
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;
restart_search:
ret = ocfs2_dx_dir_lookup(dir, &dx_root->dr_list, &lookup->dl_hinfo,
&leaf_cpos, &blkno);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_read_dx_leaf(dir, blkno, &dx_leaf_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data;
if (le16_to_cpu(dx_leaf->dl_list.de_num_used) >=
le16_to_cpu(dx_leaf->dl_list.de_count)) {
if (rebalanced) {
/*
* Rebalancing should have provided us with
* space in an appropriate leaf.
*
* XXX: Is this an abnormal condition then?
* Should we print a message here?
*/
ret = -ENOSPC;
goto out;
}
ret = ocfs2_dx_dir_rebalance(osb, dir, dx_root_bh, dx_leaf_bh,
&lookup->dl_hinfo, leaf_cpos,
blkno);
if (ret) {
if (ret != -ENOSPC)
mlog_errno(ret);
goto out;
}
/*
* Restart the lookup. The rebalance might have
* changed which block our item fits into. Mark our
* progress, so we only execute this once.
*/
brelse(dx_leaf_bh);
dx_leaf_bh = NULL;
rebalanced = 1;
goto restart_search;
}
lookup->dl_dx_leaf_bh = dx_leaf_bh;
dx_leaf_bh = NULL;
out:
brelse(dx_leaf_bh);
brelse(dx_root_bh);
return ret;
}
/*
* Get a directory ready for insert. Any directory allocation required
* happens here. Success returns zero, and enough context in the dir
* lookup result that ocfs2_add_entry() will be able complete the task
* with minimal performance impact.
*/
int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
struct inode *dir,
struct buffer_head *parent_fe_bh,
const char *name,
int namelen,
struct ocfs2_dir_lookup_result *lookup)
{
int ret;
unsigned int blocks_wanted = 1;
struct buffer_head *bh = NULL;
mlog(0, "getting ready to insert namelen %d into dir %llu\n",
namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno);
if (!namelen) {
ret = -EINVAL;
mlog_errno(ret);
goto out;
}
/*
* Do this up front to reduce confusion.
*
* The directory might start inline, then be turned into an
* indexed one, in which case we'd need to hash deep inside
* ocfs2_find_dir_space_id(). Since
* ocfs2_prepare_dx_dir_for_insert() also needs this hash
* done, there seems no point in spreading out the calls. We
* can optimize away the case where the file system doesn't
* support indexing.
*/
if (ocfs2_supports_indexed_dirs(osb))
ocfs2_dx_dir_name_hash(dir, name, namelen, &lookup->dl_hinfo);
if (ocfs2_dir_indexed(dir)) {
ret = ocfs2_find_dir_space_dx(osb, dir, parent_fe_bh, name,
namelen, lookup);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* We intentionally fall through so that the unindexed
* tree can also be prepared.
*/
}
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
ret = ocfs2_find_dir_space_id(dir, parent_fe_bh, name,
namelen, &bh, &blocks_wanted);
} else
ret = ocfs2_find_dir_space_el(dir, name, namelen, &bh);
if (ret && ret != -ENOSPC) {
mlog_errno(ret);
goto out;
}
if (ret == -ENOSPC) {
/*
* We have to expand the directory to add this name.
*/
BUG_ON(bh);
ret = ocfs2_extend_dir(osb, dir, parent_fe_bh, blocks_wanted,
lookup, &bh);
if (ret) {
if (ret != -ENOSPC)
mlog_errno(ret);
goto out;
}
BUG_ON(!bh);
}
lookup->dl_leaf_bh = bh;
bh = NULL;
out:
brelse(bh);
return ret;
}
static int ocfs2_dx_dir_remove_index(struct inode *dir,
struct buffer_head *di_bh,
struct buffer_head *dx_root_bh)
{
int ret;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
struct ocfs2_dx_root_block *dx_root;
struct inode *dx_alloc_inode = NULL;
struct buffer_head *dx_alloc_bh = NULL;
handle_t *handle;
u64 blk;
u16 bit;
u64 bg_blkno;
dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
dx_alloc_inode = ocfs2_get_system_file_inode(osb,
EXTENT_ALLOC_SYSTEM_INODE,
le16_to_cpu(dx_root->dr_suballoc_slot));
if (!dx_alloc_inode) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
mutex_lock(&dx_alloc_inode->i_mutex);
ret = ocfs2_inode_lock(dx_alloc_inode, &dx_alloc_bh, 1);
if (ret) {
mlog_errno(ret);
goto out_mutex;
}
handle = ocfs2_start_trans(osb, OCFS2_DX_ROOT_REMOVE_CREDITS);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out_unlock;
}
ret = ocfs2_journal_access_di(handle, dir, di_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
OCFS2_I(dir)->ip_dyn_features &= ~OCFS2_INDEXED_DIR_FL;
di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
di->i_dx_root = cpu_to_le64(0ULL);
ocfs2_journal_dirty(handle, di_bh);
blk = le64_to_cpu(dx_root->dr_blkno);
bit = le16_to_cpu(dx_root->dr_suballoc_bit);
bg_blkno = ocfs2_which_suballoc_group(blk, bit);
ret = ocfs2_free_suballoc_bits(handle, dx_alloc_inode, dx_alloc_bh,
bit, bg_blkno, 1);
if (ret)
mlog_errno(ret);
out_commit:
ocfs2_commit_trans(osb, handle);
out_unlock:
ocfs2_inode_unlock(dx_alloc_inode, 1);
out_mutex:
mutex_unlock(&dx_alloc_inode->i_mutex);
brelse(dx_alloc_bh);
out:
iput(dx_alloc_inode);
return ret;
}
int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh)
{
int ret;
unsigned int uninitialized_var(clen);
u32 major_hash = UINT_MAX, p_cpos, uninitialized_var(cpos);
u64 uninitialized_var(blkno);
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
struct ocfs2_cached_dealloc_ctxt dealloc;
struct ocfs2_extent_tree et;
ocfs2_init_dealloc_ctxt(&dealloc);
if (!ocfs2_dir_indexed(dir))
return 0;
ret = ocfs2_read_dx_root(dir, di, &dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
ocfs2_init_dx_root_extent_tree(&et, dir, dx_root_bh);
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
/* XXX: What if dr_clusters is too large? */
while (le32_to_cpu(dx_root->dr_clusters)) {
ret = ocfs2_dx_dir_lookup_rec(dir, &dx_root->dr_list,
major_hash, &cpos, &blkno, &clen);
if (ret) {
mlog_errno(ret);
goto out;
}
p_cpos = ocfs2_blocks_to_clusters(dir->i_sb, blkno);
ret = ocfs2_remove_btree_range(dir, &et, cpos, p_cpos, clen,
&dealloc);
if (ret) {
mlog_errno(ret);
goto out;
}
if (cpos == 0)
break;
major_hash = cpos - 1;
}
ret = ocfs2_dx_dir_remove_index(dir, di_bh, dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
ocfs2_remove_from_cache(dir, dx_root_bh);
out:
ocfs2_schedule_truncate_log_flush(osb, 1);
ocfs2_run_deallocs(osb, &dealloc);
brelse(dx_root_bh);
return ret;
}
