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OpenCloudOS-Kernel/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 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>
#define MLOG_MASK_PREFIX ML_NAMEI
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.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 "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_extend_dir(struct ocfs2_super *osb,
struct inode *dir,
struct buffer_head *parent_fe_bh,
unsigned int blocks_wanted,
struct buffer_head **new_de_bh);
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);
/*
* 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_block(OCFS2_SB(dir->i_sb), OCFS2_I(dir)->ip_blkno,
&di_bh, OCFS2_BH_CACHED, dir);
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 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 = ocfs2_bread(dir, b++, &err, 1);
bh_use[ra_max] = bh;
}
}
if ((bh = bh_use[ra_ptr++]) == NULL)
goto next;
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
/* read error, skip block & hope for the best */
ocfs2_error(dir->i_sb, "reading directory %llu, "
"offset %lu\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno,
block);
brelse(bh);
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;
}
/*
* Try to find an entry of the provided name within 'dir'.
*
* If nothing was found, NULL is returned. Otherwise, a buffer_head
* and pointer to the dir entry are passed back.
*
* Caller can NOT assume anything about the contents of the
* buffer_head - it is 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.
*/
struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
struct inode *dir,
struct ocfs2_dir_entry **res_dir)
{
*res_dir = NULL;
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return ocfs2_find_entry_id(name, namelen, dir, res_dir);
return ocfs2_find_entry_el(name, namelen, dir, res_dir);
}
/*
* Update inode number and type of a previously found directory entry.
*/
int ocfs2_update_entry(struct inode *dir, handle_t *handle,
struct buffer_head *de_bh, struct ocfs2_dir_entry *de,
struct inode *new_entry_inode)
{
int ret;
/*
* The same code works fine for both inline-data and extent
* based directories, so no need to split this up.
*/
ret = ocfs2_journal_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;
}
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;
mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
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 = ocfs2_journal_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 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_block(OCFS2_SB(dir->i_sb), OCFS2_I(dir)->ip_blkno,
&di_bh, OCFS2_BH_CACHED, dir);
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);
}
/*
* ocfs2_delete_entry deletes a directory entry by merging it with the
* previous entry
*/
int ocfs2_delete_entry(handle_t *handle,
struct inode *dir,
struct ocfs2_dir_entry *de_del,
struct buffer_head *bh)
{
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return ocfs2_delete_entry_id(handle, dir, de_del, bh);
return ocfs2_delete_entry_el(handle, dir, de_del, 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;
}
/* we don't always have a dentry for what we want to add, so people
* like orphan dir can call this instead.
*
* If you pass me insert_bh, I'll skip the search of the other dir
* blocks and put the record in there.
*/
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 buffer_head *insert_bh)
{
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;
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;
}
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;
}
status = ocfs2_journal_access(handle, dir, insert_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
/* 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_block(OCFS2_SB(inode->i_sb), OCFS2_I(inode)->ip_blkno,
&di_bh, OCFS2_BH_CACHED, inode);
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;
}
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;
int err;
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;
bh = ocfs2_bread(inode, blk, &err, 0);
if (!bh) {
mlog(ML_ERROR,
"directory #%llu contains a hole at offset %lld\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
*f_pos);
*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 = ocfs2_bread(inode, ++blk, &err, 1);
if (tmp)
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);
}
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 buffer_head **dirent_bh,
struct ocfs2_dir_entry **dirent)
{
int status = -ENOENT;
mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n",
namelen, name, blkno, inode, dirent_bh, dirent);
*dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent);
if (!*dirent_bh || !*dirent) {
status = -ENOENT;
goto leave;
}
*blkno = le64_to_cpu((*dirent)->inode);
status = 0;
leave:
if (status < 0) {
*dirent = NULL;
if (*dirent_bh) {
brelse(*dirent_bh);
*dirent_bh = NULL;
}
}
mlog_exit(status);
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 buffer_head *bh = NULL;
struct ocfs2_dir_entry *dirent = NULL;
ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &bh, &dirent);
brelse(bh);
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 buffer_head *dirent_bh = NULL;
struct ocfs2_dir_entry *dirent = NULL;
mlog_entry("dir %llu, name '%.*s'\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name);
ret = -EEXIST;
dirent_bh = ocfs2_find_entry(name, namelen, dir, &dirent);
if (dirent_bh)
goto bail;
ret = 0;
bail:
if (dirent_bh)
brelse(dirent_bh);
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.
*/
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;
}
static void 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);
}
/*
* 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(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)
{
int status;
struct buffer_head *new_bh = NULL;
mlog_entry_void();
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(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);
ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data,
osb->sb->s_blocksize);
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;
bail:
if (new_bh)
brelse(new_bh);
mlog_exit(status);
return status;
}
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)
{
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);
return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh,
data_ac);
}
static void ocfs2_expand_last_dirent(char *start, unsigned int old_size,
unsigned int new_size)
{
struct ocfs2_dir_entry *de;
struct ocfs2_dir_entry *prev_de;
char *de_buf, *limit;
unsigned int 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 buffer_head **first_block_bh)
{
int ret, credits = OCFS2_INLINE_TO_EXTENTS_CREDITS;
u32 alloc, bit_off, len;
struct super_block *sb = dir->i_sb;
u64 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 buffer_head *dirdata_bh = NULL;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
handle_t *handle;
alloc = ocfs2_clusters_for_bytes(sb, bytes);
/*
* We should never need more than 2 clusters for this -
* 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.
*/
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;
}
/*
* 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;
}
/*
* 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(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->s_blocksize);
ret = ocfs2_journal_dirty(handle, 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(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);
dir->i_blocks = ocfs2_inode_sector_count(dir);
/*
* 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, di_bh, 0, blkno, len, 0,
NULL);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_dirty(handle, di_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
/*
* 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, di_bh, 1, blkno,
len, 0, NULL);
if (ret) {
mlog_errno(ret);
goto out;
}
}
*first_block_bh = dirdata_bh;
dirdata_bh = NULL;
out_commit:
ocfs2_commit_trans(osb, handle);
out_sem:
up_write(&oi->ip_alloc_sem);
out:
if (data_ac)
ocfs2_free_alloc_context(data_ac);
brelse(dirdata_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;
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;
status = ocfs2_do_extend_allocation(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:
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 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_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;
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, &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);
num_free_extents = ocfs2_num_free_extents(osb, dir, fe);
if (num_free_extents < 0) {
status = num_free_extents;
mlog_errno(status);
goto bail;
}
if (!num_free_extents) {
status = ocfs2_reserve_new_metadata(osb, fe, &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, fe, 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(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;
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);
if (new_bh)
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 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;
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;
}
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) + (dir->i_sb->s_blocksize - i_size_read(dir));
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;
bh = ocfs2_bread(dir, 0, &status, 0);
if (!bh) {
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;
}
bh = ocfs2_bread(dir,
offset >> sb->s_blocksize_bits,
&status,
0);
if (!bh) {
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_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;
}
offset += le16_to_cpu(de->rec_len);
de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len));
}
status = 0;
bail:
if (bh)
brelse(bh);
mlog_exit(status);
return status;
}
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 buffer_head **ret_de_bh)
{
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);
*ret_de_bh = NULL;
if (!namelen) {
ret = -EINVAL;
mlog_errno(ret);
goto out;
}
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,
&bh);
if (ret) {
if (ret != -ENOSPC)
mlog_errno(ret);
goto out;
}
BUG_ON(!bh);
}
*ret_de_bh = bh;
bh = NULL;
out:
if (bh)
brelse(bh);
return ret;
}
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