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5f7136db82
linux/fs/ocfs2/dir.c
Kees Cook 3f649ab728 treewide: Remove uninitialized_var() usage 
Using uninitialized_var() is dangerous as it papers over real bugs[1]
(or can in the future), and suppresses unrelated compiler warnings
(e.g. "unused variable"). If the compiler thinks it is uninitialized,
either simply initialize the variable or make compiler changes.

In preparation for removing[2] the[3] macro[4], remove all remaining
needless uses with the following script:

git grep '\buninitialized_var\b' | cut -d: -f1 | sort -u | \
	xargs perl -pi -e \
		's/\buninitialized_var\(([^\)]+)\)/\1/g;
		 s:\s*/\* (GCC be quiet|to make compiler happy) \*/$::g;'

drivers/video/fbdev/riva/riva_hw.c was manually tweaked to avoid
pathological white-space.

No outstanding warnings were found building allmodconfig with GCC 9.3.0
for x86_64, i386, arm64, arm, powerpc, powerpc64le, s390x, mips, sparc64,
alpha, and m68k.

[1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/
[2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/
[3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/
[4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/

Reviewed-by: Leon Romanovsky <leonro@mellanox.com> # drivers/infiniband and mlx4/mlx5
Acked-by: Jason Gunthorpe <jgg@mellanox.com> # IB
Acked-by: Kalle Valo <kvalo@codeaurora.org> # wireless drivers
Reviewed-by: Chao Yu <yuchao0@huawei.com> # erofs
Signed-off-by: Kees Cook <keescook@chromium.org>
2020-07-16 12:35:15 -07:00

4462 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* dir.c
*
* Creates, reads, walks and deletes directory-nodes
*
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
*
* Portions of this code from linux/fs/ext3/dir.c
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/fs/minix/dir.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/quotaops.h>
#include <linux/sort.h>
#include <linux/iversion.h>
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "blockcheck.h"
#include "dir.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "file.h"
#include "inode.h"
#include "journal.h"
#include "namei.h"
#include "suballoc.h"
#include "super.h"
#include "sysfile.h"
#include "uptodate.h"
#include "ocfs2_trace.h"
#include "buffer_head_io.h"
#define NAMEI_RA_CHUNKS 2
#define NAMEI_RA_BLOCKS 4
#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
static int ocfs2_do_extend_dir(struct super_block *sb,
handle_t *handle,
struct inode *dir,
struct buffer_head *parent_fe_bh,
struct ocfs2_alloc_context *data_ac,
struct ocfs2_alloc_context *meta_ac,
struct buffer_head **new_bh);
static int ocfs2_dir_indexed(struct inode *inode);
/*
* These are distinct checks because future versions of the file system will
* want to have a trailing dirent structure independent of indexing.
*/
static int ocfs2_supports_dir_trailer(struct inode *dir)
{
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return 0;
return ocfs2_meta_ecc(osb) || ocfs2_dir_indexed(dir);
}
/*
* "new' here refers to the point at which we're creating a new
* directory via "mkdir()", but also when we're expanding an inline
* directory. In either case, we don't yet have the indexing bit set
* on the directory, so the standard checks will fail in when metaecc
* is turned off. Only directory-initialization type functions should
* use this then. Everything else wants ocfs2_supports_dir_trailer()
*/
static int ocfs2_new_dir_wants_trailer(struct inode *dir)
{
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
return ocfs2_meta_ecc(osb) ||
ocfs2_supports_indexed_dirs(osb);
}
static inline unsigned int ocfs2_dir_trailer_blk_off(struct super_block *sb)
{
return sb->s_blocksize - sizeof(struct ocfs2_dir_block_trailer);
}
#define ocfs2_trailer_from_bh(_bh, _sb) ((struct ocfs2_dir_block_trailer *) ((_bh)->b_data + ocfs2_dir_trailer_blk_off((_sb))))
/* XXX ocfs2_block_dqtrailer() is similar but not quite - can we make
* them more consistent? */
struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
void *data)
{
char *p = data;
p += blocksize - sizeof(struct ocfs2_dir_block_trailer);
return (struct ocfs2_dir_block_trailer *)p;
}
/*
* XXX: This is executed once on every dirent. We should consider optimizing
* it.
*/
static int ocfs2_skip_dir_trailer(struct inode *dir,
struct ocfs2_dir_entry *de,
unsigned long offset,
unsigned long blklen)
{
unsigned long toff = blklen - sizeof(struct ocfs2_dir_block_trailer);
if (!ocfs2_supports_dir_trailer(dir))
return 0;
if (offset != toff)
return 0;
return 1;
}
static void ocfs2_init_dir_trailer(struct inode *inode,
struct buffer_head *bh, u16 rec_len)
{
struct ocfs2_dir_block_trailer *trailer;
trailer = ocfs2_trailer_from_bh(bh, inode->i_sb);
strcpy(trailer->db_signature, OCFS2_DIR_TRAILER_SIGNATURE);
trailer->db_compat_rec_len =
cpu_to_le16(sizeof(struct ocfs2_dir_block_trailer));
trailer->db_parent_dinode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
trailer->db_blkno = cpu_to_le64(bh->b_blocknr);
trailer->db_free_rec_len = cpu_to_le16(rec_len);
}
/*
* Link an unindexed block with a dir trailer structure into the index free
* list. This function will modify dirdata_bh, but assumes you've already
* passed it to the journal.
*/
static int ocfs2_dx_dir_link_trailer(struct inode *dir, handle_t *handle,
struct buffer_head *dx_root_bh,
struct buffer_head *dirdata_bh)
{
int ret;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dir_block_trailer *trailer;
ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
trailer = ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb);
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
trailer->db_free_next = dx_root->dr_free_blk;
dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr);
ocfs2_journal_dirty(handle, dx_root_bh);
out:
return ret;
}
static int ocfs2_free_list_at_root(struct ocfs2_dir_lookup_result *res)
{
return res->dl_prev_leaf_bh == NULL;
}
void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res)
{
brelse(res->dl_dx_root_bh);
brelse(res->dl_leaf_bh);
brelse(res->dl_dx_leaf_bh);
brelse(res->dl_prev_leaf_bh);
}
static int ocfs2_dir_indexed(struct inode *inode)
{
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INDEXED_DIR_FL)
return 1;
return 0;
}
static inline int ocfs2_dx_root_inline(struct ocfs2_dx_root_block *dx_root)
{
return dx_root->dr_flags & OCFS2_DX_FLAG_INLINE;
}
/*
* Hashing code adapted from ext3
*/
#define DELTA 0x9E3779B9
static void TEA_transform(__u32 buf[4], __u32 const in[])
{
__u32 sum = 0;
__u32 b0 = buf[0], b1 = buf[1];
__u32 a = in[0], b = in[1], c = in[2], d = in[3];
int n = 16;
do {
sum += DELTA;
b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b);
b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d);
} while (--n);
buf[0] += b0;
buf[1] += b1;
}
static void str2hashbuf(const char *msg, int len, __u32 *buf, int num)
{
__u32 pad, val;
int i;
pad = (__u32)len | ((__u32)len << 8);
pad |= pad << 16;
val = pad;
if (len > num*4)
len = num * 4;
for (i = 0; i < len; i++) {
if ((i % 4) == 0)
val = pad;
val = msg[i] + (val << 8);
if ((i % 4) == 3) {
*buf++ = val;
val = pad;
num--;
}
}
if (--num >= 0)
*buf++ = val;
while (--num >= 0)
*buf++ = pad;
}
static void ocfs2_dx_dir_name_hash(struct inode *dir, const char *name, int len,
struct ocfs2_dx_hinfo *hinfo)
{
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
const char *p;
__u32 in[8], buf[4];
/*
* XXX: Is this really necessary, if the index is never looked
* at by readdir? Is a hash value of '0' a bad idea?
*/
if ((len == 1 && !strncmp(".", name, 1)) ||
(len == 2 && !strncmp("..", name, 2))) {
buf[0] = buf[1] = 0;
goto out;
}
#ifdef OCFS2_DEBUG_DX_DIRS
/*
* This makes it very easy to debug indexing problems. We
* should never allow this to be selected without hand editing
* this file though.
*/
buf[0] = buf[1] = len;
goto out;
#endif
memcpy(buf, osb->osb_dx_seed, sizeof(buf));
p = name;
while (len > 0) {
str2hashbuf(p, len, in, 4);
TEA_transform(buf, in);
len -= 16;
p += 16;
}
out:
hinfo->major_hash = buf[0];
hinfo->minor_hash = buf[1];
}
/*
* bh passed here can be an inode block or a dir data block, depending
* on the inode inline data flag.
*/
static int ocfs2_check_dir_entry(struct inode * dir,
struct ocfs2_dir_entry * de,
struct buffer_head * bh,
unsigned long offset)
{
const char *error_msg = NULL;
const int rlen = le16_to_cpu(de->rec_len);
if (unlikely(rlen < OCFS2_DIR_REC_LEN(1)))
error_msg = "rec_len is smaller than minimal";
else if (unlikely(rlen % 4 != 0))
error_msg = "rec_len % 4 != 0";
else if (unlikely(rlen < OCFS2_DIR_REC_LEN(de->name_len)))
error_msg = "rec_len is too small for name_len";
else if (unlikely(
((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize))
error_msg = "directory entry across blocks";
if (unlikely(error_msg != NULL))
mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
"offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
de->name_len);
return error_msg == NULL ? 1 : 0;
}
static inline int ocfs2_match(int len,
const char * const name,
struct ocfs2_dir_entry *de)
{
if (len != de->name_len)
return 0;
if (!de->inode)
return 0;
return !memcmp(name, de->name, len);
}
/*
* Returns 0 if not found, -1 on failure, and 1 on success
*/
static inline int ocfs2_search_dirblock(struct buffer_head *bh,
struct inode *dir,
const char *name, int namelen,
unsigned long offset,
char *first_de,
unsigned int bytes,
struct ocfs2_dir_entry **res_dir)
{
struct ocfs2_dir_entry *de;
char *dlimit, *de_buf;
int de_len;
int ret = 0;
de_buf = first_de;
dlimit = de_buf + bytes;
while (de_buf < dlimit) {
/* this code is executed quadratically often */
/* do minimal checking `by hand' */
de = (struct ocfs2_dir_entry *) de_buf;
if (de_buf + namelen <= dlimit &&
ocfs2_match(namelen, name, de)) {
/* found a match - just to be sure, do a full check */
if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
ret = -1;
goto bail;
}
*res_dir = de;
ret = 1;
goto bail;
}
/* prevent looping on a bad block */
de_len = le16_to_cpu(de->rec_len);
if (de_len <= 0) {
ret = -1;
goto bail;
}
de_buf += de_len;
offset += de_len;
}
bail:
trace_ocfs2_search_dirblock(ret);
return ret;
}
static struct buffer_head *ocfs2_find_entry_id(const char *name,
int namelen,
struct inode *dir,
struct ocfs2_dir_entry **res_dir)
{
int ret, found;
struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di;
struct ocfs2_inline_data *data;
ret = ocfs2_read_inode_block(dir, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
data = &di->id2.i_data;
found = ocfs2_search_dirblock(di_bh, dir, name, namelen, 0,
data->id_data, i_size_read(dir), res_dir);
if (found == 1)
return di_bh;
brelse(di_bh);
out:
return NULL;
}
static int ocfs2_validate_dir_block(struct super_block *sb,
struct buffer_head *bh)
{
int rc;
struct ocfs2_dir_block_trailer *trailer =
ocfs2_trailer_from_bh(bh, sb);
/*
* We don't validate dirents here, that's handled
* in-place when the code walks them.
*/
trace_ocfs2_validate_dir_block((unsigned long long)bh->b_blocknr);
BUG_ON(!buffer_uptodate(bh));
/*
* If the ecc fails, we return the error but otherwise
* leave the filesystem running. We know any error is
* local to this block.
*
* Note that we are safe to call this even if the directory
* doesn't have a trailer. Filesystems without metaecc will do
* nothing, and filesystems with it will have one.
*/
rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &trailer->db_check);
if (rc)
mlog(ML_ERROR, "Checksum failed for dinode %llu\n",
(unsigned long long)bh->b_blocknr);
return rc;
}
/*
* Validate a directory trailer.
*
* We check the trailer here rather than in ocfs2_validate_dir_block()
* because that function doesn't have the inode to test.
*/
static int ocfs2_check_dir_trailer(struct inode *dir, struct buffer_head *bh)
{
int rc = 0;
struct ocfs2_dir_block_trailer *trailer;
trailer = ocfs2_trailer_from_bh(bh, dir->i_sb);
if (!OCFS2_IS_VALID_DIR_TRAILER(trailer)) {
rc = ocfs2_error(dir->i_sb,
"Invalid dirblock #%llu: signature = %.*s\n",
(unsigned long long)bh->b_blocknr, 7,
trailer->db_signature);
goto out;
}
if (le64_to_cpu(trailer->db_blkno) != bh->b_blocknr) {
rc = ocfs2_error(dir->i_sb,
"Directory block #%llu has an invalid db_blkno of %llu\n",
(unsigned long long)bh->b_blocknr,
(unsigned long long)le64_to_cpu(trailer->db_blkno));
goto out;
}
if (le64_to_cpu(trailer->db_parent_dinode) !=
OCFS2_I(dir)->ip_blkno) {
rc = ocfs2_error(dir->i_sb,
"Directory block #%llu on dinode #%llu has an invalid parent_dinode of %llu\n",
(unsigned long long)bh->b_blocknr,
(unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long long)le64_to_cpu(trailer->db_blkno));
goto out;
}
out:
return rc;
}
/*
* This function forces all errors to -EIO for consistency with its
* predecessor, ocfs2_bread(). We haven't audited what returning the
* real error codes would do to callers. We log the real codes with
* mlog_errno() before we squash them.
*/
static int ocfs2_read_dir_block(struct inode *inode, u64 v_block,
struct buffer_head **bh, int flags)
{
int rc = 0;
struct buffer_head *tmp = *bh;
rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, flags,
ocfs2_validate_dir_block);
if (rc) {
mlog_errno(rc);
goto out;
}
if (!(flags & OCFS2_BH_READAHEAD) &&
ocfs2_supports_dir_trailer(inode)) {
rc = ocfs2_check_dir_trailer(inode, tmp);
if (rc) {
if (!*bh)
brelse(tmp);
mlog_errno(rc);
goto out;
}
}
/* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
if (!*bh)
*bh = tmp;
out:
return rc ? -EIO : 0;
}
/*
* Read the block at 'phys' which belongs to this directory
* inode. This function does no virtual->physical block translation -
* what's passed in is assumed to be a valid directory block.
*/
static int ocfs2_read_dir_block_direct(struct inode *dir, u64 phys,
struct buffer_head **bh)
{
int ret;
struct buffer_head *tmp = *bh;
ret = ocfs2_read_block(INODE_CACHE(dir), phys, &tmp,
ocfs2_validate_dir_block);
if (ret) {
mlog_errno(ret);
goto out;
}
if (ocfs2_supports_dir_trailer(dir)) {
ret = ocfs2_check_dir_trailer(dir, tmp);
if (ret) {
if (!*bh)
brelse(tmp);
mlog_errno(ret);
goto out;
}
}
if (!ret && !*bh)
*bh = tmp;
out:
return ret;
}
static int ocfs2_validate_dx_root(struct super_block *sb,
struct buffer_head *bh)
{
int ret;
struct ocfs2_dx_root_block *dx_root;
BUG_ON(!buffer_uptodate(bh));
dx_root = (struct ocfs2_dx_root_block *) bh->b_data;
ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_root->dr_check);
if (ret) {
mlog(ML_ERROR,
"Checksum failed for dir index root block %llu\n",
(unsigned long long)bh->b_blocknr);
return ret;
}
if (!OCFS2_IS_VALID_DX_ROOT(dx_root)) {
ret = ocfs2_error(sb,
"Dir Index Root # %llu has bad signature %.*s\n",
(unsigned long long)le64_to_cpu(dx_root->dr_blkno),
7, dx_root->dr_signature);
}
return ret;
}
static int ocfs2_read_dx_root(struct inode *dir, struct ocfs2_dinode *di,
struct buffer_head **dx_root_bh)
{
int ret;
u64 blkno = le64_to_cpu(di->i_dx_root);
struct buffer_head *tmp = *dx_root_bh;
ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp,
ocfs2_validate_dx_root);
/* If ocfs2_read_block() got us a new bh, pass it up. */
if (!ret && !*dx_root_bh)
*dx_root_bh = tmp;
return ret;
}
static int ocfs2_validate_dx_leaf(struct super_block *sb,
struct buffer_head *bh)
{
int ret;
struct ocfs2_dx_leaf *dx_leaf = (struct ocfs2_dx_leaf *)bh->b_data;
BUG_ON(!buffer_uptodate(bh));
ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_leaf->dl_check);
if (ret) {
mlog(ML_ERROR,
"Checksum failed for dir index leaf block %llu\n",
(unsigned long long)bh->b_blocknr);
return ret;
}
if (!OCFS2_IS_VALID_DX_LEAF(dx_leaf)) {
ret = ocfs2_error(sb, "Dir Index Leaf has bad signature %.*s\n",
7, dx_leaf->dl_signature);
}
return ret;
}
static int ocfs2_read_dx_leaf(struct inode *dir, u64 blkno,
struct buffer_head **dx_leaf_bh)
{
int ret;
struct buffer_head *tmp = *dx_leaf_bh;
ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp,
ocfs2_validate_dx_leaf);
/* If ocfs2_read_block() got us a new bh, pass it up. */
if (!ret && !*dx_leaf_bh)
*dx_leaf_bh = tmp;
return ret;
}
/*
* Read a series of dx_leaf blocks. This expects all buffer_head
* pointers to be NULL on function entry.
*/
static int ocfs2_read_dx_leaves(struct inode *dir, u64 start, int num,
struct buffer_head **dx_leaf_bhs)
{
int ret;
ret = ocfs2_read_blocks(INODE_CACHE(dir), start, num, dx_leaf_bhs, 0,
ocfs2_validate_dx_leaf);
if (ret)
mlog_errno(ret);
return ret;
}
static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen,
struct inode *dir,
struct ocfs2_dir_entry **res_dir)
{
struct super_block *sb;
struct buffer_head *bh_use[NAMEI_RA_SIZE];
struct buffer_head *bh, *ret = NULL;
unsigned long start, block, b;
int ra_max = 0; /* Number of bh's in the readahead
buffer, bh_use[] */
int ra_ptr = 0; /* Current index into readahead
buffer */
int num = 0;
int nblocks, i;
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;
ocfs2_read_dir_block(dir, b++, &bh,
OCFS2_BH_READAHEAD);
bh_use[ra_max] = bh;
}
}
if ((bh = bh_use[ra_ptr++]) == NULL)
goto next;
if (ocfs2_read_dir_block(dir, block, &bh, 0)) {
/* read error, skip block & hope for the best.
* ocfs2_read_dir_block() has released the bh. */
mlog(ML_ERROR, "reading directory %llu, "
"offset %lu\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno,
block);
goto next;
}
i = ocfs2_search_dirblock(bh, dir, name, namelen,
block << sb->s_blocksize_bits,
bh->b_data, sb->s_blocksize,
res_dir);
if (i == 1) {
OCFS2_I(dir)->ip_dir_start_lookup = block;
ret = bh;
goto cleanup_and_exit;
} else {
brelse(bh);
if (i < 0)
goto cleanup_and_exit;
}
next:
if (++block >= nblocks)
block = 0;
} while (block != start);
/*
* If the directory has grown while we were searching, then
* search the last part of the directory before giving up.
*/
block = nblocks;
nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
if (block < nblocks) {
start = 0;
goto restart;
}
cleanup_and_exit:
/* Clean up the read-ahead blocks */
for (; ra_ptr < ra_max; ra_ptr++)
brelse(bh_use[ra_ptr]);
trace_ocfs2_find_entry_el(ret);
return ret;
}
static int ocfs2_dx_dir_lookup_rec(struct inode *inode,
struct ocfs2_extent_list *el,
u32 major_hash,
u32 *ret_cpos,
u64 *ret_phys_blkno,
unsigned int *ret_clen)
{
int ret = 0, i, found;
struct buffer_head *eb_bh = NULL;
struct ocfs2_extent_block *eb;
struct ocfs2_extent_rec *rec = NULL;
if (el->l_tree_depth) {
ret = ocfs2_find_leaf(INODE_CACHE(inode), el, major_hash,
&eb_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
eb = (struct ocfs2_extent_block *) eb_bh->b_data;
el = &eb->h_list;
if (el->l_tree_depth) {
ret = ocfs2_error(inode->i_sb,
"Inode %lu has non zero tree depth in btree tree block %llu\n",
inode->i_ino,
(unsigned long long)eb_bh->b_blocknr);
goto out;
}
}
found = 0;
for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
rec = &el->l_recs[i];
if (le32_to_cpu(rec->e_cpos) <= major_hash) {
found = 1;
break;
}
}
if (!found) {
ret = ocfs2_error(inode->i_sb,
"Inode %lu has bad extent record (%u, %u, 0) in btree\n",
inode->i_ino,
le32_to_cpu(rec->e_cpos),
ocfs2_rec_clusters(el, rec));
goto out;
}
if (ret_phys_blkno)
*ret_phys_blkno = le64_to_cpu(rec->e_blkno);
if (ret_cpos)
*ret_cpos = le32_to_cpu(rec->e_cpos);
if (ret_clen)
*ret_clen = le16_to_cpu(rec->e_leaf_clusters);
out:
brelse(eb_bh);
return ret;
}
/*
* Returns the block index, from the start of the cluster which this
* hash belongs too.
*/
static inline unsigned int __ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb,
u32 minor_hash)
{
return minor_hash & osb->osb_dx_mask;
}
static inline unsigned int ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb,
struct ocfs2_dx_hinfo *hinfo)
{
return __ocfs2_dx_dir_hash_idx(osb, hinfo->minor_hash);
}
static int ocfs2_dx_dir_lookup(struct inode *inode,
struct ocfs2_extent_list *el,
struct ocfs2_dx_hinfo *hinfo,
u32 *ret_cpos,
u64 *ret_phys_blkno)
{
int ret = 0;
unsigned int cend, clen;
u32 cpos;
u64 blkno;
u32 name_hash = hinfo->major_hash;
ret = ocfs2_dx_dir_lookup_rec(inode, el, name_hash, &cpos, &blkno,
&clen);
if (ret) {
mlog_errno(ret);
goto out;
}
cend = cpos + clen;
if (name_hash >= cend) {
/* We want the last cluster */
blkno += ocfs2_clusters_to_blocks(inode->i_sb, clen - 1);
cpos += clen - 1;
} else {
blkno += ocfs2_clusters_to_blocks(inode->i_sb,
name_hash - cpos);
cpos = name_hash;
}
/*
* We now have the cluster which should hold our entry. To
* find the exact block from the start of the cluster to
* search, we take the lower bits of the hash.
*/
blkno += ocfs2_dx_dir_hash_idx(OCFS2_SB(inode->i_sb), hinfo);
if (ret_phys_blkno)
*ret_phys_blkno = blkno;
if (ret_cpos)
*ret_cpos = cpos;
out:
return ret;
}
static int ocfs2_dx_dir_search(const char *name, int namelen,
struct inode *dir,
struct ocfs2_dx_root_block *dx_root,
struct ocfs2_dir_lookup_result *res)
{
int ret, i, found;
u64 phys;
struct buffer_head *dx_leaf_bh = NULL;
struct ocfs2_dx_leaf *dx_leaf;
struct ocfs2_dx_entry *dx_entry = NULL;
struct buffer_head *dir_ent_bh = NULL;
struct ocfs2_dir_entry *dir_ent = NULL;
struct ocfs2_dx_hinfo *hinfo = &res->dl_hinfo;
struct ocfs2_extent_list *dr_el;
struct ocfs2_dx_entry_list *entry_list;
ocfs2_dx_dir_name_hash(dir, name, namelen, &res->dl_hinfo);
if (ocfs2_dx_root_inline(dx_root)) {
entry_list = &dx_root->dr_entries;
goto search;
}
dr_el = &dx_root->dr_list;
ret = ocfs2_dx_dir_lookup(dir, dr_el, hinfo, NULL, &phys);
if (ret) {
mlog_errno(ret);
goto out;
}
trace_ocfs2_dx_dir_search((unsigned long long)OCFS2_I(dir)->ip_blkno,
namelen, name, hinfo->major_hash,
hinfo->minor_hash, (unsigned long long)phys);
ret = ocfs2_read_dx_leaf(dir, phys, &dx_leaf_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_leaf = (struct ocfs2_dx_leaf *) dx_leaf_bh->b_data;
trace_ocfs2_dx_dir_search_leaf_info(
le16_to_cpu(dx_leaf->dl_list.de_num_used),
le16_to_cpu(dx_leaf->dl_list.de_count));
entry_list = &dx_leaf->dl_list;
search:
/*
* Empty leaf is legal, so no need to check for that.
*/
found = 0;
for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) {
dx_entry = &entry_list->de_entries[i];
if (hinfo->major_hash != le32_to_cpu(dx_entry->dx_major_hash)
|| hinfo->minor_hash != le32_to_cpu(dx_entry->dx_minor_hash))
continue;
/*
* Search unindexed leaf block now. We're not
* guaranteed to find anything.
*/
ret = ocfs2_read_dir_block_direct(dir,
le64_to_cpu(dx_entry->dx_dirent_blk),
&dir_ent_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* XXX: We should check the unindexed block here,
* before using it.
*/
found = ocfs2_search_dirblock(dir_ent_bh, dir, name, namelen,
0, dir_ent_bh->b_data,
dir->i_sb->s_blocksize, &dir_ent);
if (found == 1)
break;
if (found == -1) {
/* This means we found a bad directory entry. */
ret = -EIO;
mlog_errno(ret);
goto out;
}
brelse(dir_ent_bh);
dir_ent_bh = NULL;
}
if (found <= 0) {
ret = -ENOENT;
goto out;
}
res->dl_leaf_bh = dir_ent_bh;
res->dl_entry = dir_ent;
res->dl_dx_leaf_bh = dx_leaf_bh;
res->dl_dx_entry = dx_entry;
ret = 0;
out:
if (ret) {
brelse(dx_leaf_bh);
brelse(dir_ent_bh);
}
return ret;
}
static int ocfs2_find_entry_dx(const char *name, int namelen,
struct inode *dir,
struct ocfs2_dir_lookup_result *lookup)
{
int ret;
struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di;
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dx_root_block *dx_root;
ret = ocfs2_read_inode_block(dir, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
ret = ocfs2_read_dx_root(dir, di, &dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
ret = ocfs2_dx_dir_search(name, namelen, dir, dx_root, lookup);
if (ret) {
if (ret != -ENOENT)
mlog_errno(ret);
goto out;
}
lookup->dl_dx_root_bh = dx_root_bh;
dx_root_bh = NULL;
out:
brelse(di_bh);
brelse(dx_root_bh);
return ret;
}
/*
* Try to find an entry of the provided name within 'dir'.
*
* If nothing was found, -ENOENT is returned. Otherwise, zero is
* returned and the struct 'res' will contain information useful to
* other directory manipulation functions.
*
* Caller can NOT assume anything about the contents of the
* buffer_heads - they are passed back only so that it can be passed
* into any one of the manipulation functions (add entry, delete
* entry, etc). As an example, bh in the extent directory case is a
* data block, in the inline-data case it actually points to an inode,
* in the indexed directory case, multiple buffers are involved.
*/
int ocfs2_find_entry(const char *name, int namelen,
struct inode *dir, struct ocfs2_dir_lookup_result *lookup)
{
struct buffer_head *bh;
struct ocfs2_dir_entry *res_dir = NULL;
if (ocfs2_dir_indexed(dir))
return ocfs2_find_entry_dx(name, namelen, dir, lookup);
/*
* The unindexed dir code only uses part of the lookup
* structure, so there's no reason to push it down further
* than this.
*/
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
bh = ocfs2_find_entry_id(name, namelen, dir, &res_dir);
else
bh = ocfs2_find_entry_el(name, namelen, dir, &res_dir);
if (bh == NULL)
return -ENOENT;
lookup->dl_leaf_bh = bh;
lookup->dl_entry = res_dir;
return 0;
}
/*
* Update inode number and type of a previously found directory entry.
*/
int ocfs2_update_entry(struct inode *dir, handle_t *handle,
struct ocfs2_dir_lookup_result *res,
struct inode *new_entry_inode)
{
int ret;
ocfs2_journal_access_func access = ocfs2_journal_access_db;
struct ocfs2_dir_entry *de = res->dl_entry;
struct buffer_head *de_bh = res->dl_leaf_bh;
/*
* The same code works fine for both inline-data and extent
* based directories, so no need to split this up. The only
* difference is the journal_access function.
*/
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
access = ocfs2_journal_access_di;
ret = access(handle, INODE_CACHE(dir), de_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
de->inode = cpu_to_le64(OCFS2_I(new_entry_inode)->ip_blkno);
ocfs2_set_de_type(de, new_entry_inode->i_mode);
ocfs2_journal_dirty(handle, de_bh);
out:
return ret;
}
/*
* __ocfs2_delete_entry deletes a directory entry by merging it with the
* previous entry
*/
static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir,
struct ocfs2_dir_entry *de_del,
struct buffer_head *bh, char *first_de,
unsigned int bytes)
{
struct ocfs2_dir_entry *de, *pde;
int i, status = -ENOENT;
ocfs2_journal_access_func access = ocfs2_journal_access_db;
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
access = ocfs2_journal_access_di;
i = 0;
pde = NULL;
de = (struct ocfs2_dir_entry *) first_de;
while (i < bytes) {
if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
status = -EIO;
mlog_errno(status);
goto bail;
}
if (de == de_del) {
status = access(handle, INODE_CACHE(dir), bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
status = -EIO;
mlog_errno(status);
goto bail;
}
if (pde)
le16_add_cpu(&pde->rec_len,
le16_to_cpu(de->rec_len));
de->inode = 0;
inode_inc_iversion(dir);
ocfs2_journal_dirty(handle, bh);
goto bail;
}
i += le16_to_cpu(de->rec_len);
pde = de;
de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
}
bail:
return status;
}
static unsigned int ocfs2_figure_dirent_hole(struct ocfs2_dir_entry *de)
{
unsigned int hole;
if (le64_to_cpu(de->inode) == 0)
hole = le16_to_cpu(de->rec_len);
else
hole = le16_to_cpu(de->rec_len) -
OCFS2_DIR_REC_LEN(de->name_len);
return hole;
}
static int ocfs2_find_max_rec_len(struct super_block *sb,
struct buffer_head *dirblock_bh)
{
int size, this_hole, largest_hole = 0;
char *trailer, *de_buf, *limit, *start = dirblock_bh->b_data;
struct ocfs2_dir_entry *de;
trailer = (char *)ocfs2_trailer_from_bh(dirblock_bh, sb);
size = ocfs2_dir_trailer_blk_off(sb);
limit = start + size;
de_buf = start;
de = (struct ocfs2_dir_entry *)de_buf;
do {
if (de_buf != trailer) {
this_hole = ocfs2_figure_dirent_hole(de);
if (this_hole > largest_hole)
largest_hole = this_hole;
}
de_buf += le16_to_cpu(de->rec_len);
de = (struct ocfs2_dir_entry *)de_buf;
} while (de_buf < limit);
if (largest_hole >= OCFS2_DIR_MIN_REC_LEN)
return largest_hole;
return 0;
}
static void ocfs2_dx_list_remove_entry(struct ocfs2_dx_entry_list *entry_list,
int index)
{
int num_used = le16_to_cpu(entry_list->de_num_used);
if (num_used == 1 || index == (num_used - 1))
goto clear;
memmove(&entry_list->de_entries[index],
&entry_list->de_entries[index + 1],
(num_used - index - 1)*sizeof(struct ocfs2_dx_entry));
clear:
num_used--;
memset(&entry_list->de_entries[num_used], 0,
sizeof(struct ocfs2_dx_entry));
entry_list->de_num_used = cpu_to_le16(num_used);
}
static int ocfs2_delete_entry_dx(handle_t *handle, struct inode *dir,
struct ocfs2_dir_lookup_result *lookup)
{
int ret, index, max_rec_len, add_to_free_list = 0;
struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
struct buffer_head *leaf_bh = lookup->dl_leaf_bh;
struct ocfs2_dx_leaf *dx_leaf;
struct ocfs2_dx_entry *dx_entry = lookup->dl_dx_entry;
struct ocfs2_dir_block_trailer *trailer;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dx_entry_list *entry_list;
/*
* This function gets a bit messy because we might have to
* modify the root block, regardless of whether the indexed
* entries are stored inline.
*/
/*
* *Only* set 'entry_list' here, based on where we're looking
* for the indexed entries. Later, we might still want to
* journal both blocks, based on free list state.
*/
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
if (ocfs2_dx_root_inline(dx_root)) {
entry_list = &dx_root->dr_entries;
} else {
dx_leaf = (struct ocfs2_dx_leaf *) lookup->dl_dx_leaf_bh->b_data;
entry_list = &dx_leaf->dl_list;
}
/* Neither of these are a disk corruption - that should have
* been caught by lookup, before we got here. */
BUG_ON(le16_to_cpu(entry_list->de_count) <= 0);
BUG_ON(le16_to_cpu(entry_list->de_num_used) <= 0);
index = (char *)dx_entry - (char *)entry_list->de_entries;
index /= sizeof(*dx_entry);
if (index >= le16_to_cpu(entry_list->de_num_used)) {
mlog(ML_ERROR, "Dir %llu: Bad dx_entry ptr idx %d, (%p, %p)\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno, index,
entry_list, dx_entry);
return -EIO;
}
/*
* We know that removal of this dirent will leave enough room
* for a new one, so add this block to the free list if it
* isn't already there.
*/
trailer = ocfs2_trailer_from_bh(leaf_bh, dir->i_sb);
if (trailer->db_free_rec_len == 0)
add_to_free_list = 1;
/*
* Add the block holding our index into the journal before
* removing the unindexed entry. If we get an error return
* from __ocfs2_delete_entry(), then it hasn't removed the
* entry yet. Likewise, successful return means we *must*
* remove the indexed entry.
*
* We're also careful to journal the root tree block here as
* the entry count needs to be updated. Also, we might be
* adding to the start of the free list.
*/
ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
if (!ocfs2_dx_root_inline(dx_root)) {
ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir),
lookup->dl_dx_leaf_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
}
trace_ocfs2_delete_entry_dx((unsigned long long)OCFS2_I(dir)->ip_blkno,
index);
ret = __ocfs2_delete_entry(handle, dir, lookup->dl_entry,
leaf_bh, leaf_bh->b_data, leaf_bh->b_size);
if (ret) {
mlog_errno(ret);
goto out;
}
max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, leaf_bh);
trailer->db_free_rec_len = cpu_to_le16(max_rec_len);
if (add_to_free_list) {
trailer->db_free_next = dx_root->dr_free_blk;
dx_root->dr_free_blk = cpu_to_le64(leaf_bh->b_blocknr);
ocfs2_journal_dirty(handle, dx_root_bh);
}
/* leaf_bh was journal_accessed for us in __ocfs2_delete_entry */
ocfs2_journal_dirty(handle, leaf_bh);
le32_add_cpu(&dx_root->dr_num_entries, -1);
ocfs2_journal_dirty(handle, dx_root_bh);
ocfs2_dx_list_remove_entry(entry_list, index);
if (!ocfs2_dx_root_inline(dx_root))
ocfs2_journal_dirty(handle, lookup->dl_dx_leaf_bh);
out:
return ret;
}
static inline int ocfs2_delete_entry_id(handle_t *handle,
struct inode *dir,
struct ocfs2_dir_entry *de_del,
struct buffer_head *bh)
{
int ret;
struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di;
struct ocfs2_inline_data *data;
ret = ocfs2_read_inode_block(dir, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
data = &di->id2.i_data;
ret = __ocfs2_delete_entry(handle, dir, de_del, bh, data->id_data,
i_size_read(dir));
brelse(di_bh);
out:
return ret;
}
static inline int ocfs2_delete_entry_el(handle_t *handle,
struct inode *dir,
struct ocfs2_dir_entry *de_del,
struct buffer_head *bh)
{
return __ocfs2_delete_entry(handle, dir, de_del, bh, bh->b_data,
bh->b_size);
}
/*
* Delete a directory entry. Hide the details of directory
* implementation from the caller.
*/
int ocfs2_delete_entry(handle_t *handle,
struct inode *dir,
struct ocfs2_dir_lookup_result *res)
{
if (ocfs2_dir_indexed(dir))
return ocfs2_delete_entry_dx(handle, dir, res);
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return ocfs2_delete_entry_id(handle, dir, res->dl_entry,
res->dl_leaf_bh);
return ocfs2_delete_entry_el(handle, dir, res->dl_entry,
res->dl_leaf_bh);
}
/*
* Check whether 'de' has enough room to hold an entry of
* 'new_rec_len' bytes.
*/
static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de,
unsigned int new_rec_len)
{
unsigned int de_really_used;
/* Check whether this is an empty record with enough space */
if (le64_to_cpu(de->inode) == 0 &&
le16_to_cpu(de->rec_len) >= new_rec_len)
return 1;
/*
* Record might have free space at the end which we can
* use.
*/
de_really_used = OCFS2_DIR_REC_LEN(de->name_len);
if (le16_to_cpu(de->rec_len) >= (de_really_used + new_rec_len))
return 1;
return 0;
}
static void ocfs2_dx_dir_leaf_insert_tail(struct ocfs2_dx_leaf *dx_leaf,
struct ocfs2_dx_entry *dx_new_entry)
{
int i;
i = le16_to_cpu(dx_leaf->dl_list.de_num_used);
dx_leaf->dl_list.de_entries[i] = *dx_new_entry;
le16_add_cpu(&dx_leaf->dl_list.de_num_used, 1);
}
static void ocfs2_dx_entry_list_insert(struct ocfs2_dx_entry_list *entry_list,
struct ocfs2_dx_hinfo *hinfo,
u64 dirent_blk)
{
int i;
struct ocfs2_dx_entry *dx_entry;
i = le16_to_cpu(entry_list->de_num_used);
dx_entry = &entry_list->de_entries[i];
memset(dx_entry, 0, sizeof(*dx_entry));
dx_entry->dx_major_hash = cpu_to_le32(hinfo->major_hash);
dx_entry->dx_minor_hash = cpu_to_le32(hinfo->minor_hash);
dx_entry->dx_dirent_blk = cpu_to_le64(dirent_blk);
le16_add_cpu(&entry_list->de_num_used, 1);
}
static int __ocfs2_dx_dir_leaf_insert(struct inode *dir, handle_t *handle,
struct ocfs2_dx_hinfo *hinfo,
u64 dirent_blk,
struct buffer_head *dx_leaf_bh)
{
int ret;
struct ocfs2_dx_leaf *dx_leaf;
ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), dx_leaf_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data;
ocfs2_dx_entry_list_insert(&dx_leaf->dl_list, hinfo, dirent_blk);
ocfs2_journal_dirty(handle, dx_leaf_bh);
out:
return ret;
}
static void ocfs2_dx_inline_root_insert(struct inode *dir, handle_t *handle,
struct ocfs2_dx_hinfo *hinfo,
u64 dirent_blk,
struct ocfs2_dx_root_block *dx_root)
{
ocfs2_dx_entry_list_insert(&dx_root->dr_entries, hinfo, dirent_blk);
}
static int ocfs2_dx_dir_insert(struct inode *dir, handle_t *handle,
struct ocfs2_dir_lookup_result *lookup)
{
int ret = 0;
struct ocfs2_dx_root_block *dx_root;
struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_root = (struct ocfs2_dx_root_block *)lookup->dl_dx_root_bh->b_data;
if (ocfs2_dx_root_inline(dx_root)) {
ocfs2_dx_inline_root_insert(dir, handle,
&lookup->dl_hinfo,
lookup->dl_leaf_bh->b_blocknr,
dx_root);
} else {
ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &lookup->dl_hinfo,
lookup->dl_leaf_bh->b_blocknr,
lookup->dl_dx_leaf_bh);
if (ret)
goto out;
}
le32_add_cpu(&dx_root->dr_num_entries, 1);
ocfs2_journal_dirty(handle, dx_root_bh);
out:
return ret;
}
static void ocfs2_remove_block_from_free_list(struct inode *dir,
handle_t *handle,
struct ocfs2_dir_lookup_result *lookup)
{
struct ocfs2_dir_block_trailer *trailer, *prev;
struct ocfs2_dx_root_block *dx_root;
struct buffer_head *bh;
trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb);
if (ocfs2_free_list_at_root(lookup)) {
bh = lookup->dl_dx_root_bh;
dx_root = (struct ocfs2_dx_root_block *)bh->b_data;
dx_root->dr_free_blk = trailer->db_free_next;
} else {
bh = lookup->dl_prev_leaf_bh;
prev = ocfs2_trailer_from_bh(bh, dir->i_sb);
prev->db_free_next = trailer->db_free_next;
}
trailer->db_free_rec_len = cpu_to_le16(0);
trailer->db_free_next = cpu_to_le64(0);
ocfs2_journal_dirty(handle, bh);
ocfs2_journal_dirty(handle, lookup->dl_leaf_bh);
}
/*
* This expects that a journal write has been reserved on
* lookup->dl_prev_leaf_bh or lookup->dl_dx_root_bh
*/
static void ocfs2_recalc_free_list(struct inode *dir, handle_t *handle,
struct ocfs2_dir_lookup_result *lookup)
{
int max_rec_len;
struct ocfs2_dir_block_trailer *trailer;
/* Walk dl_leaf_bh to figure out what the new free rec_len is. */
max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, lookup->dl_leaf_bh);
if (max_rec_len) {
/*
* There's still room in this block, so no need to remove it
* from the free list. In this case, we just want to update
* the rec len accounting.
*/
trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb);
trailer->db_free_rec_len = cpu_to_le16(max_rec_len);
ocfs2_journal_dirty(handle, lookup->dl_leaf_bh);
} else {
ocfs2_remove_block_from_free_list(dir, handle, lookup);
}
}
/* we don't always have a dentry for what we want to add, so people
* like orphan dir can call this instead.
*
* The lookup context must have been filled from
* ocfs2_prepare_dir_for_insert.
*/
int __ocfs2_add_entry(handle_t *handle,
struct inode *dir,
const char *name, int namelen,
struct inode *inode, u64 blkno,
struct buffer_head *parent_fe_bh,
struct ocfs2_dir_lookup_result *lookup)
{
unsigned long offset;
unsigned short rec_len;
struct ocfs2_dir_entry *de, *de1;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_fe_bh->b_data;
struct super_block *sb = dir->i_sb;
int retval;
unsigned int size = sb->s_blocksize;
struct buffer_head *insert_bh = lookup->dl_leaf_bh;
char *data_start = insert_bh->b_data;
if (!namelen)
return -EINVAL;
if (ocfs2_dir_indexed(dir)) {
struct buffer_head *bh;
/*
* An indexed dir may require that we update the free space
* list. Reserve a write to the previous node in the list so
* that we don't fail later.
*
* XXX: This can be either a dx_root_block, or an unindexed
* directory tree leaf block.
*/
if (ocfs2_free_list_at_root(lookup)) {
bh = lookup->dl_dx_root_bh;
retval = ocfs2_journal_access_dr(handle,
INODE_CACHE(dir), bh,
OCFS2_JOURNAL_ACCESS_WRITE);
} else {
bh = lookup->dl_prev_leaf_bh;
retval = ocfs2_journal_access_db(handle,
INODE_CACHE(dir), bh,
OCFS2_JOURNAL_ACCESS_WRITE);
}
if (retval) {
mlog_errno(retval);
return retval;
}
} else if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
data_start = di->id2.i_data.id_data;
size = i_size_read(dir);
BUG_ON(insert_bh != parent_fe_bh);
}
rec_len = OCFS2_DIR_REC_LEN(namelen);
offset = 0;
de = (struct ocfs2_dir_entry *) data_start;
while (1) {
BUG_ON((char *)de >= (size + data_start));
/* These checks should've already been passed by the
* prepare function, but I guess we can leave them
* here anyway. */
if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
retval = -ENOENT;
goto bail;
}
if (ocfs2_match(namelen, name, de)) {
retval = -EEXIST;
goto bail;
}
/* We're guaranteed that we should have space, so we
* can't possibly have hit the trailer...right? */
mlog_bug_on_msg(ocfs2_skip_dir_trailer(dir, de, offset, size),
"Hit dir trailer trying to insert %.*s "
"(namelen %d) into directory %llu. "
"offset is %lu, trailer offset is %d\n",
namelen, name, namelen,
(unsigned long long)parent_fe_bh->b_blocknr,
offset, ocfs2_dir_trailer_blk_off(dir->i_sb));
if (ocfs2_dirent_would_fit(de, rec_len)) {
dir->i_mtime = dir->i_ctime = current_time(dir);
retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
if (retval < 0) {
mlog_errno(retval);
goto bail;
}
if (insert_bh == parent_fe_bh)
retval = ocfs2_journal_access_di(handle,
INODE_CACHE(dir),
insert_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
else {
retval = ocfs2_journal_access_db(handle,
INODE_CACHE(dir),
insert_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (!retval && ocfs2_dir_indexed(dir))
retval = ocfs2_dx_dir_insert(dir,
handle,
lookup);
}
if (retval) {
mlog_errno(retval);
goto bail;
}
/* By now the buffer is marked for journaling */
offset += le16_to_cpu(de->rec_len);
if (le64_to_cpu(de->inode)) {
de1 = (struct ocfs2_dir_entry *)((char *) de +
OCFS2_DIR_REC_LEN(de->name_len));
de1->rec_len =
cpu_to_le16(le16_to_cpu(de->rec_len) -
OCFS2_DIR_REC_LEN(de->name_len));
de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
de = de1;
}
de->file_type = FT_UNKNOWN;
if (blkno) {
de->inode = cpu_to_le64(blkno);
ocfs2_set_de_type(de, inode->i_mode);
} else
de->inode = 0;
de->name_len = namelen;
memcpy(de->name, name, namelen);
if (ocfs2_dir_indexed(dir))
ocfs2_recalc_free_list(dir, handle, lookup);
inode_inc_iversion(dir);
ocfs2_journal_dirty(handle, insert_bh);
retval = 0;
goto bail;
}
offset += le16_to_cpu(de->rec_len);
de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
}
/* when you think about it, the assert above should prevent us
* from ever getting here. */
retval = -ENOSPC;
bail:
if (retval)
mlog_errno(retval);
return retval;
}
static int ocfs2_dir_foreach_blk_id(struct inode *inode,
u64 *f_version,
struct dir_context *ctx)
{
int ret, i;
unsigned long offset = ctx->pos;
struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di;
struct ocfs2_inline_data *data;
struct ocfs2_dir_entry *de;
ret = ocfs2_read_inode_block(inode, &di_bh);
if (ret) {
mlog(ML_ERROR, "Unable to read inode block for dir %llu\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno);
goto out;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
data = &di->id2.i_data;
while (ctx->pos < i_size_read(inode)) {
/* If the dir block has changed since the last call to
* readdir(2), then we might be pointing to an invalid
* dirent right now. Scan from the start of the block
* to make sure. */
if (!inode_eq_iversion(inode, *f_version)) {
for (i = 0; i < i_size_read(inode) && i < offset; ) {
de = (struct ocfs2_dir_entry *)
(data->id_data + i);
/* It's too expensive to do a full
* dirent test each time round this
* loop, but we do have to test at
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
if (le16_to_cpu(de->rec_len) <
OCFS2_DIR_REC_LEN(1))
break;
i += le16_to_cpu(de->rec_len);
}
ctx->pos = offset = i;
*f_version = inode_query_iversion(inode);
}
de = (struct ocfs2_dir_entry *) (data->id_data + ctx->pos);
if (!ocfs2_check_dir_entry(inode, de, di_bh, ctx->pos)) {
/* On error, skip the f_pos to the end. */
ctx->pos = i_size_read(inode);
break;
}
offset += le16_to_cpu(de->rec_len);
if (le64_to_cpu(de->inode)) {
if (!dir_emit(ctx, de->name, de->name_len,
le64_to_cpu(de->inode),
fs_ftype_to_dtype(de->file_type)))
goto out;
}
ctx->pos += le16_to_cpu(de->rec_len);
}
out:
brelse(di_bh);
return 0;
}
/*
* NOTE: This function can be called against unindexed directories,
* and indexed ones.
*/
static int ocfs2_dir_foreach_blk_el(struct inode *inode,
u64 *f_version,
struct dir_context *ctx,
bool persist)
{
unsigned long offset, blk, last_ra_blk = 0;
int i;
struct buffer_head * bh, * tmp;
struct ocfs2_dir_entry * de;
struct super_block * sb = inode->i_sb;
unsigned int ra_sectors = 16;
int stored = 0;
bh = NULL;
offset = ctx->pos & (sb->s_blocksize - 1);
while (ctx->pos < i_size_read(inode)) {
blk = ctx->pos >> sb->s_blocksize_bits;
if (ocfs2_read_dir_block(inode, blk, &bh, 0)) {
/* Skip the corrupt dirblock and keep trying */
ctx->pos += sb->s_blocksize - offset;
continue;
}
/* The idea here is to begin with 8k read-ahead and to stay
* 4k ahead of our current position.
*
* TODO: Use the pagecache for this. We just need to
* make sure it's cluster-safe... */
if (!last_ra_blk
|| (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) {
for (i = ra_sectors >> (sb->s_blocksize_bits - 9);
i > 0; i--) {
tmp = NULL;
if (!ocfs2_read_dir_block(inode, ++blk, &tmp,
OCFS2_BH_READAHEAD))
brelse(tmp);
}
last_ra_blk = blk;
ra_sectors = 8;
}
/* If the dir block has changed since the last call to
* readdir(2), then we might be pointing to an invalid
* dirent right now. Scan from the start of the block
* to make sure. */
if (!inode_eq_iversion(inode, *f_version)) {
for (i = 0; i < sb->s_blocksize && i < offset; ) {
de = (struct ocfs2_dir_entry *) (bh->b_data + i);
/* It's too expensive to do a full
* dirent test each time round this
* loop, but we do have to test at
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
if (le16_to_cpu(de->rec_len) <
OCFS2_DIR_REC_LEN(1))
break;
i += le16_to_cpu(de->rec_len);
}
offset = i;
ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1))
| offset;
*f_version = inode_query_iversion(inode);
}
while (ctx->pos < i_size_read(inode)
&& offset < sb->s_blocksize) {
de = (struct ocfs2_dir_entry *) (bh->b_data + offset);
if (!ocfs2_check_dir_entry(inode, de, bh, offset)) {
/* On error, skip the f_pos to the
next block. */
ctx->pos = (ctx->pos | (sb->s_blocksize - 1)) + 1;
break;
}
if (le64_to_cpu(de->inode)) {
if (!dir_emit(ctx, de->name,
de->name_len,
le64_to_cpu(de->inode),
fs_ftype_to_dtype(de->file_type))) {
brelse(bh);
return 0;
}
stored++;
}
offset += le16_to_cpu(de->rec_len);
ctx->pos += le16_to_cpu(de->rec_len);
}
offset = 0;
brelse(bh);
bh = NULL;
if (!persist && stored)
break;
}
return 0;
}
static int ocfs2_dir_foreach_blk(struct inode *inode, u64 *f_version,
struct dir_context *ctx,
bool persist)
{
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return ocfs2_dir_foreach_blk_id(inode, f_version, ctx);
return ocfs2_dir_foreach_blk_el(inode, f_version, ctx, persist);
}
/*
* This is intended to be called from inside other kernel functions,
* so we fake some arguments.
*/
int ocfs2_dir_foreach(struct inode *inode, struct dir_context *ctx)
{
u64 version = inode_query_iversion(inode);
ocfs2_dir_foreach_blk(inode, &version, ctx, true);
return 0;
}
/*
* ocfs2_readdir()
*
*/
int ocfs2_readdir(struct file *file, struct dir_context *ctx)
{
int error = 0;
struct inode *inode = file_inode(file);
int lock_level = 0;
trace_ocfs2_readdir((unsigned long long)OCFS2_I(inode)->ip_blkno);
error = ocfs2_inode_lock_atime(inode, file->f_path.mnt, &lock_level, 1);
if (lock_level && error >= 0) {
/* We release EX lock which used to update atime
* and get PR lock again to reduce contention
* on commonly accessed directories. */
ocfs2_inode_unlock(inode, 1);
lock_level = 0;
error = ocfs2_inode_lock(inode, NULL, 0);
}
if (error < 0) {
if (error != -ENOENT)
mlog_errno(error);
/* we haven't got any yet, so propagate the error. */
goto bail_nolock;
}
error = ocfs2_dir_foreach_blk(inode, &file->f_version, ctx, false);
ocfs2_inode_unlock(inode, lock_level);
if (error)
mlog_errno(error);
bail_nolock:
return error;
}
/*
* NOTE: this should always be called with parent dir i_mutex taken.
*/
int ocfs2_find_files_on_disk(const char *name,
int namelen,
u64 *blkno,
struct inode *inode,
struct ocfs2_dir_lookup_result *lookup)
{
int status = -ENOENT;
trace_ocfs2_find_files_on_disk(namelen, name, blkno,
(unsigned long long)OCFS2_I(inode)->ip_blkno);
status = ocfs2_find_entry(name, namelen, inode, lookup);
if (status)
goto leave;
*blkno = le64_to_cpu(lookup->dl_entry->inode);
status = 0;
leave:
return status;
}
/*
* Convenience function for callers which just want the block number
* mapped to a name and don't require the full dirent info, etc.
*/
int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
int namelen, u64 *blkno)
{
int ret;
struct ocfs2_dir_lookup_result lookup = { NULL, };
ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &lookup);
ocfs2_free_dir_lookup_result(&lookup);
return ret;
}
/* Check for a name within a directory.
*
* Return 0 if the name does not exist
* Return -EEXIST if the directory contains the name
*
* Callers should have i_mutex + a cluster lock on dir
*/
int ocfs2_check_dir_for_entry(struct inode *dir,
const char *name,
int namelen)
{
int ret = 0;
struct ocfs2_dir_lookup_result lookup = { NULL, };
trace_ocfs2_check_dir_for_entry(
(unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name);
if (ocfs2_find_entry(name, namelen, dir, &lookup) == 0) {
ret = -EEXIST;
mlog_errno(ret);
}
ocfs2_free_dir_lookup_result(&lookup);
return ret;
}
struct ocfs2_empty_dir_priv {
struct dir_context ctx;
unsigned seen_dot;
unsigned seen_dot_dot;
unsigned seen_other;
unsigned dx_dir;
};
static int ocfs2_empty_dir_filldir(struct dir_context *ctx, const char *name,
int name_len, loff_t pos, u64 ino,
unsigned type)
{
struct ocfs2_empty_dir_priv *p =
container_of(ctx, struct ocfs2_empty_dir_priv, ctx);
/*
* Check the positions of "." and ".." records to be sure
* they're in the correct place.
*
* Indexed directories don't need to proceed past the first
* two entries, so we end the scan after seeing '..'. Despite
* that, we allow the scan to proceed In the event that we
* have a corrupted indexed directory (no dot or dot dot
* entries). This allows us to double check for existing
* entries which might not have been found in the index.
*/
if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) {
p->seen_dot = 1;
return 0;
}
if (name_len == 2 && !strncmp("..", name, 2) &&
pos == OCFS2_DIR_REC_LEN(1)) {
p->seen_dot_dot = 1;
if (p->dx_dir && p->seen_dot)
return 1;
return 0;
}
p->seen_other = 1;
return 1;
}
static int ocfs2_empty_dir_dx(struct inode *inode,
struct ocfs2_empty_dir_priv *priv)
{
int ret;
struct buffer_head *di_bh = NULL;
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dinode *di;
struct ocfs2_dx_root_block *dx_root;
priv->dx_dir = 1;
ret = ocfs2_read_inode_block(inode, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
ret = ocfs2_read_dx_root(inode, di, &dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
if (le32_to_cpu(dx_root->dr_num_entries) != 2)
priv->seen_other = 1;
out:
brelse(di_bh);
brelse(dx_root_bh);
return ret;
}
/*
* routine to check that the specified directory is empty (for rmdir)
*
* Returns 1 if dir is empty, zero otherwise.
*
* XXX: This is a performance problem for unindexed directories.
*/
int ocfs2_empty_dir(struct inode *inode)
{
int ret;
struct ocfs2_empty_dir_priv priv = {
.ctx.actor = ocfs2_empty_dir_filldir,
};
if (ocfs2_dir_indexed(inode)) {
ret = ocfs2_empty_dir_dx(inode, &priv);
if (ret)
mlog_errno(ret);
/*
* We still run ocfs2_dir_foreach to get the checks
* for "." and "..".
*/
}
ret = ocfs2_dir_foreach(inode, &priv.ctx);
if (ret)
mlog_errno(ret);
if (!priv.seen_dot || !priv.seen_dot_dot) {
mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno);
/*
* XXX: Is it really safe to allow an unlink to continue?
*/
return 1;
}
return !priv.seen_other;
}
/*
* Fills "." and ".." dirents in a new directory block. Returns dirent for
* "..", which might be used during creation of a directory with a trailing
* header. It is otherwise safe to ignore the return code.
*/
static struct ocfs2_dir_entry *ocfs2_fill_initial_dirents(struct inode *inode,
struct inode *parent,
char *start,
unsigned int size)
{
struct ocfs2_dir_entry *de = (struct ocfs2_dir_entry *)start;
de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
de->name_len = 1;
de->rec_len =
cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
strcpy(de->name, ".");
ocfs2_set_de_type(de, S_IFDIR);
de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
de->rec_len = cpu_to_le16(size - OCFS2_DIR_REC_LEN(1));
de->name_len = 2;
strcpy(de->name, "..");
ocfs2_set_de_type(de, S_IFDIR);
return de;
}
/*
* This works together with code in ocfs2_mknod_locked() which sets
* the inline-data flag and initializes the inline-data section.
*/
static int ocfs2_fill_new_dir_id(struct ocfs2_super *osb,
handle_t *handle,
struct inode *parent,
struct inode *inode,
struct buffer_head *di_bh)
{
int ret;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
struct ocfs2_inline_data *data = &di->id2.i_data;
unsigned int size = le16_to_cpu(data->id_count);
ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
ocfs2_fill_initial_dirents(inode, parent, data->id_data, size);
ocfs2_journal_dirty(handle, di_bh);
i_size_write(inode, size);
set_nlink(inode, 2);
inode->i_blocks = ocfs2_inode_sector_count(inode);
ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
if (ret < 0)
mlog_errno(ret);
out:
return ret;
}
static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
handle_t *handle,
struct inode *parent,
struct inode *inode,
struct buffer_head *fe_bh,
struct ocfs2_alloc_context *data_ac,
struct buffer_head **ret_new_bh)
{
int status;
unsigned int size = osb->sb->s_blocksize;
struct buffer_head *new_bh = NULL;
struct ocfs2_dir_entry *de;
if (ocfs2_new_dir_wants_trailer(inode))
size = ocfs2_dir_trailer_blk_off(parent->i_sb);
status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
data_ac, NULL, &new_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
status = ocfs2_journal_access_db(handle, INODE_CACHE(inode), new_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (status < 0) {
mlog_errno(status);
goto bail;
}
memset(new_bh->b_data, 0, osb->sb->s_blocksize);
de = ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data, size);
if (ocfs2_new_dir_wants_trailer(inode)) {
int size = le16_to_cpu(de->rec_len);
/*
* Figure out the size of the hole left over after
* insertion of '.' and '..'. The trailer wants this
* information.
*/
size -= OCFS2_DIR_REC_LEN(2);
size -= sizeof(struct ocfs2_dir_block_trailer);
ocfs2_init_dir_trailer(inode, new_bh, size);
}
ocfs2_journal_dirty(handle, new_bh);
i_size_write(inode, inode->i_sb->s_blocksize);
set_nlink(inode, 2);
inode->i_blocks = ocfs2_inode_sector_count(inode);
status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = 0;
if (ret_new_bh) {
*ret_new_bh = new_bh;
new_bh = NULL;
}
bail:
brelse(new_bh);
return status;
}
static int ocfs2_dx_dir_attach_index(struct ocfs2_super *osb,
handle_t *handle, struct inode *dir,
struct buffer_head *di_bh,
struct buffer_head *dirdata_bh,
struct ocfs2_alloc_context *meta_ac,
int dx_inline, u32 num_entries,
struct buffer_head **ret_dx_root_bh)
{
int ret;
struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
u16 dr_suballoc_bit;
u64 suballoc_loc, dr_blkno;
unsigned int num_bits;
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dir_block_trailer *trailer =
ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb);
ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
&dr_suballoc_bit, &num_bits, &dr_blkno);
if (ret) {
mlog_errno(ret);
goto out;
}
trace_ocfs2_dx_dir_attach_index(
(unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long long)dr_blkno);
dx_root_bh = sb_getblk(osb->sb, dr_blkno);
if (dx_root_bh == NULL) {
ret = -ENOMEM;
goto out;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dx_root_bh);
ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
memset(dx_root, 0, osb->sb->s_blocksize);
strcpy(dx_root->dr_signature, OCFS2_DX_ROOT_SIGNATURE);
dx_root->dr_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
dx_root->dr_suballoc_loc = cpu_to_le64(suballoc_loc);
dx_root->dr_suballoc_bit = cpu_to_le16(dr_suballoc_bit);
dx_root->dr_fs_generation = cpu_to_le32(osb->fs_generation);
dx_root->dr_blkno = cpu_to_le64(dr_blkno);
dx_root->dr_dir_blkno = cpu_to_le64(OCFS2_I(dir)->ip_blkno);
dx_root->dr_num_entries = cpu_to_le32(num_entries);
if (le16_to_cpu(trailer->db_free_rec_len))
dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr);
else
dx_root->dr_free_blk = cpu_to_le64(0);
if (dx_inline) {
dx_root->dr_flags |= OCFS2_DX_FLAG_INLINE;
dx_root->dr_entries.de_count =
cpu_to_le16(ocfs2_dx_entries_per_root(osb->sb));
} else {
dx_root->dr_list.l_count =
cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb));
}
ocfs2_journal_dirty(handle, dx_root_bh);
ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret) {
mlog_errno(ret);
goto out;
}
di->i_dx_root = cpu_to_le64(dr_blkno);
spin_lock(&OCFS2_I(dir)->ip_lock);
OCFS2_I(dir)->ip_dyn_features |= OCFS2_INDEXED_DIR_FL;
di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
spin_unlock(&OCFS2_I(dir)->ip_lock);
ocfs2_journal_dirty(handle, di_bh);
*ret_dx_root_bh = dx_root_bh;
dx_root_bh = NULL;
out:
brelse(dx_root_bh);
return ret;
}
static int ocfs2_dx_dir_format_cluster(struct ocfs2_super *osb,
handle_t *handle, struct inode *dir,
struct buffer_head **dx_leaves,
int num_dx_leaves, u64 start_blk)
{
int ret, i;
struct ocfs2_dx_leaf *dx_leaf;
struct buffer_head *bh;
for (i = 0; i < num_dx_leaves; i++) {
bh = sb_getblk(osb->sb, start_blk + i);
if (bh == NULL) {
ret = -ENOMEM;
goto out;
}
dx_leaves[i] = bh;
ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), bh);
ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
dx_leaf = (struct ocfs2_dx_leaf *) bh->b_data;
memset(dx_leaf, 0, osb->sb->s_blocksize);
strcpy(dx_leaf->dl_signature, OCFS2_DX_LEAF_SIGNATURE);
dx_leaf->dl_fs_generation = cpu_to_le32(osb->fs_generation);
dx_leaf->dl_blkno = cpu_to_le64(bh->b_blocknr);
dx_leaf->dl_list.de_count =
cpu_to_le16(ocfs2_dx_entries_per_leaf(osb->sb));
trace_ocfs2_dx_dir_format_cluster(
(unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long long)bh->b_blocknr,
le16_to_cpu(dx_leaf->dl_list.de_count));
ocfs2_journal_dirty(handle, bh);
}
ret = 0;
out:
return ret;
}
/*
* Allocates and formats a new cluster for use in an indexed dir
* leaf. This version will not do the extent insert, so that it can be
* used by operations which need careful ordering.
*/
static int __ocfs2_dx_dir_new_cluster(struct inode *dir,
u32 cpos, handle_t *handle,
struct ocfs2_alloc_context *data_ac,
struct buffer_head **dx_leaves,
int num_dx_leaves, u64 *ret_phys_blkno)
{
int ret;
u32 phys, num;
u64 phys_blkno;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
/*
* XXX: For create, this should claim cluster for the index
* *before* the unindexed insert so that we have a better
* chance of contiguousness as the directory grows in number
* of entries.
*/
ret = __ocfs2_claim_clusters(handle, data_ac, 1, 1, &phys, &num);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* Format the new cluster first. That way, we're inserting
* valid data.
*/
phys_blkno = ocfs2_clusters_to_blocks(osb->sb, phys);
ret = ocfs2_dx_dir_format_cluster(osb, handle, dir, dx_leaves,
num_dx_leaves, phys_blkno);
if (ret) {
mlog_errno(ret);
goto out;
}
*ret_phys_blkno = phys_blkno;
out:
return ret;
}
static int ocfs2_dx_dir_new_cluster(struct inode *dir,
struct ocfs2_extent_tree *et,
u32 cpos, handle_t *handle,
struct ocfs2_alloc_context *data_ac,
struct ocfs2_alloc_context *meta_ac,
struct buffer_head **dx_leaves,
int num_dx_leaves)
{
int ret;
u64 phys_blkno;
ret = __ocfs2_dx_dir_new_cluster(dir, cpos, handle, data_ac, dx_leaves,
num_dx_leaves, &phys_blkno);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_insert_extent(handle, et, cpos, phys_blkno, 1, 0,
meta_ac);
if (ret)
mlog_errno(ret);
out:
return ret;
}
static struct buffer_head **ocfs2_dx_dir_kmalloc_leaves(struct super_block *sb,
int *ret_num_leaves)
{
int num_dx_leaves = ocfs2_clusters_to_blocks(sb, 1);
struct buffer_head **dx_leaves;
dx_leaves = kcalloc(num_dx_leaves, sizeof(struct buffer_head *),
GFP_NOFS);
if (dx_leaves && ret_num_leaves)
*ret_num_leaves = num_dx_leaves;
return dx_leaves;
}
static int ocfs2_fill_new_dir_dx(struct ocfs2_super *osb,
handle_t *handle,
struct inode *parent,
struct inode *inode,
struct buffer_head *di_bh,
struct ocfs2_alloc_context *data_ac,
struct ocfs2_alloc_context *meta_ac)
{
int ret;
struct buffer_head *leaf_bh = NULL;
struct buffer_head *dx_root_bh = NULL;
struct ocfs2_dx_hinfo hinfo;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dx_entry_list *entry_list;
/*
* Our strategy is to create the directory as though it were
* unindexed, then add the index block. This works with very
* little complication since the state of a new directory is a
* very well known quantity.
*
* Essentially, we have two dirents ("." and ".."), in the 1st
* block which need indexing. These are easily inserted into
* the index block.
*/
ret = ocfs2_fill_new_dir_el(osb, handle, parent, inode, di_bh,
data_ac, &leaf_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_dx_dir_attach_index(osb, handle, inode, di_bh, leaf_bh,
meta_ac, 1, 2, &dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
entry_list = &dx_root->dr_entries;
/* Buffer has been journaled for us by ocfs2_dx_dir_attach_index */
ocfs2_dx_dir_name_hash(inode, ".", 1, &hinfo);
ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr);
ocfs2_dx_dir_name_hash(inode, "..", 2, &hinfo);
ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr);
out:
brelse(dx_root_bh);
brelse(leaf_bh);
return ret;
}
int ocfs2_fill_new_dir(struct ocfs2_super *osb,
handle_t *handle,
struct inode *parent,
struct inode *inode,
struct buffer_head *fe_bh,
struct ocfs2_alloc_context *data_ac,
struct ocfs2_alloc_context *meta_ac)
{
BUG_ON(!ocfs2_supports_inline_data(osb) && data_ac == NULL);
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return ocfs2_fill_new_dir_id(osb, handle, parent, inode, fe_bh);
if (ocfs2_supports_indexed_dirs(osb))
return ocfs2_fill_new_dir_dx(osb, handle, parent, inode, fe_bh,
data_ac, meta_ac);
return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh,
data_ac, NULL);
}
static int ocfs2_dx_dir_index_block(struct inode *dir,
handle_t *handle,
struct buffer_head **dx_leaves,
int num_dx_leaves,
u32 *num_dx_entries,
struct buffer_head *dirent_bh)
{
int ret = 0, namelen, i;
char *de_buf, *limit;
struct ocfs2_dir_entry *de;
struct buffer_head *dx_leaf_bh;
struct ocfs2_dx_hinfo hinfo;
u64 dirent_blk = dirent_bh->b_blocknr;
de_buf = dirent_bh->b_data;
limit = de_buf + dir->i_sb->s_blocksize;
while (de_buf < limit) {
de = (struct ocfs2_dir_entry *)de_buf;
namelen = de->name_len;
if (!namelen || !de->inode)
goto inc;
ocfs2_dx_dir_name_hash(dir, de->name, namelen, &hinfo);
i = ocfs2_dx_dir_hash_idx(OCFS2_SB(dir->i_sb), &hinfo);
dx_leaf_bh = dx_leaves[i];
ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &hinfo,
dirent_blk, dx_leaf_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
*num_dx_entries = *num_dx_entries + 1;
inc:
de_buf += le16_to_cpu(de->rec_len);
}
out:
return ret;
}
/*
* XXX: This expects dx_root_bh to already be part of the transaction.
*/
static void ocfs2_dx_dir_index_root_block(struct inode *dir,
struct buffer_head *dx_root_bh,
struct buffer_head *dirent_bh)
{
char *de_buf, *limit;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dir_entry *de;
struct ocfs2_dx_hinfo hinfo;
u64 dirent_blk = dirent_bh->b_blocknr;
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
de_buf = dirent_bh->b_data;
limit = de_buf + dir->i_sb->s_blocksize;
while (de_buf < limit) {
de = (struct ocfs2_dir_entry *)de_buf;
if (!de->name_len || !de->inode)
goto inc;
ocfs2_dx_dir_name_hash(dir, de->name, de->name_len, &hinfo);
trace_ocfs2_dx_dir_index_root_block(
(unsigned long long)dir->i_ino,
hinfo.major_hash, hinfo.minor_hash,
de->name_len, de->name,
le16_to_cpu(dx_root->dr_entries.de_num_used));
ocfs2_dx_entry_list_insert(&dx_root->dr_entries, &hinfo,
dirent_blk);
le32_add_cpu(&dx_root->dr_num_entries, 1);
inc:
de_buf += le16_to_cpu(de->rec_len);
}
}
/*
* Count the number of inline directory entries in di_bh and compare
* them against the number of entries we can hold in an inline dx root
* block.
*/
static int ocfs2_new_dx_should_be_inline(struct inode *dir,
struct buffer_head *di_bh)
{
int dirent_count = 0;
char *de_buf, *limit;
struct ocfs2_dir_entry *de;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
de_buf = di->id2.i_data.id_data;
limit = de_buf + i_size_read(dir);
while (de_buf < limit) {
de = (struct ocfs2_dir_entry *)de_buf;
if (de->name_len && de->inode)
dirent_count++;
de_buf += le16_to_cpu(de->rec_len);
}
/* We are careful to leave room for one extra record. */
return dirent_count < ocfs2_dx_entries_per_root(dir->i_sb);
}
/*
* Expand rec_len of the rightmost dirent in a directory block so that it
* contains the end of our valid space for dirents. We do this during
* expansion from an inline directory to one with extents. The first dir block
* in that case is taken from the inline data portion of the inode block.
*
* This will also return the largest amount of contiguous space for a dirent
* in the block. That value is *not* necessarily the last dirent, even after
* expansion. The directory indexing code wants this value for free space
* accounting. We do this here since we're already walking the entire dir
* block.
*
* We add the dir trailer if this filesystem wants it.
*/
static unsigned int ocfs2_expand_last_dirent(char *start, unsigned int old_size,
struct inode *dir)
{
struct super_block *sb = dir->i_sb;
struct ocfs2_dir_entry *de;
struct ocfs2_dir_entry *prev_de;
char *de_buf, *limit;
unsigned int new_size = sb->s_blocksize;
unsigned int bytes, this_hole;
unsigned int largest_hole = 0;
if (ocfs2_new_dir_wants_trailer(dir))
new_size = ocfs2_dir_trailer_blk_off(sb);
bytes = new_size - old_size;
limit = start + old_size;
de_buf = start;
de = (struct ocfs2_dir_entry *)de_buf;
do {
this_hole = ocfs2_figure_dirent_hole(de);
if (this_hole > largest_hole)
largest_hole = this_hole;
prev_de = de;
de_buf += le16_to_cpu(de->rec_len);
de = (struct ocfs2_dir_entry *)de_buf;
} while (de_buf < limit);
le16_add_cpu(&prev_de->rec_len, bytes);
/* We need to double check this after modification of the final
* dirent. */
this_hole = ocfs2_figure_dirent_hole(prev_de);
if (this_hole > largest_hole)
largest_hole = this_hole;
if (largest_hole >= OCFS2_DIR_MIN_REC_LEN)
return largest_hole;
return 0;
}
/*
* We allocate enough clusters to fulfill "blocks_wanted", but set
* i_size to exactly one block. Ocfs2_extend_dir() will handle the
* rest automatically for us.
*
* *first_block_bh is a pointer to the 1st data block allocated to the
* directory.
*/
static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
unsigned int blocks_wanted,
struct ocfs2_dir_lookup_result *lookup,
struct buffer_head **first_block_bh)
{
u32 alloc, dx_alloc, bit_off, len, num_dx_entries = 0;
struct super_block *sb = dir->i_sb;
int ret, i, num_dx_leaves = 0, dx_inline = 0,
credits = ocfs2_inline_to_extents_credits(sb);
u64 dx_insert_blkno, blkno,
bytes = blocks_wanted << sb->s_blocksize_bits;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct ocfs2_inode_info *oi = OCFS2_I(dir);
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_alloc_context *meta_ac = NULL;
struct buffer_head *dirdata_bh = NULL;
struct buffer_head *dx_root_bh = NULL;
struct buffer_head **dx_leaves = NULL;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
handle_t *handle;
struct ocfs2_extent_tree et;
struct ocfs2_extent_tree dx_et;
int did_quota = 0, bytes_allocated = 0;
ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(dir), di_bh);
alloc = ocfs2_clusters_for_bytes(sb, bytes);
dx_alloc = 0;
down_write(&oi->ip_alloc_sem);
if (ocfs2_supports_indexed_dirs(osb)) {
credits += ocfs2_add_dir_index_credits(sb);
dx_inline = ocfs2_new_dx_should_be_inline(dir, di_bh);
if (!dx_inline) {
/* Add one more cluster for an index leaf */
dx_alloc++;
dx_leaves = ocfs2_dx_dir_kmalloc_leaves(sb,
&num_dx_leaves);
if (!dx_leaves) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
}
/* This gets us the dx_root */
ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
if (ret) {
mlog_errno(ret);
goto out;
}
}
/*
* We should never need more than 2 clusters for the unindexed
* tree - maximum dirent size is far less than one block. In
* fact, the only time we'd need more than one cluster is if
* blocksize == clustersize and the dirent won't fit in the
* extra space that the expansion to a single block gives. As
* of today, that only happens on 4k/4k file systems.
*/
BUG_ON(alloc > 2);
ret = ocfs2_reserve_clusters(osb, alloc + dx_alloc, &data_ac);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* Prepare for worst case allocation scenario of two separate
* extents in the unindexed tree.
*/
if (alloc == 2)
credits += OCFS2_SUBALLOC_ALLOC;
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out;
}
ret = dquot_alloc_space_nodirty(dir,
ocfs2_clusters_to_bytes(osb->sb, alloc + dx_alloc));
if (ret)
goto out_commit;
did_quota = 1;
if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) {
/*
* Allocate our index cluster first, to maximize the
* possibility that unindexed leaves grow
* contiguously.
*/
ret = __ocfs2_dx_dir_new_cluster(dir, 0, handle, data_ac,
dx_leaves, num_dx_leaves,
&dx_insert_blkno);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
}
/*
* Try to claim as many clusters as the bitmap can give though
* if we only get one now, that's enough to continue. The rest
* will be claimed after the conversion to extents.
*/
if (ocfs2_dir_resv_allowed(osb))
data_ac->ac_resv = &oi->ip_la_data_resv;
ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off, &len);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
/*
* Operations are carefully ordered so that we set up the new
* data block first. The conversion from inline data to
* extents follows.
*/
blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
dirdata_bh = sb_getblk(sb, blkno);
if (!dirdata_bh) {
ret = -ENOMEM;
mlog_errno(ret);
goto out_commit;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dirdata_bh);
ret = ocfs2_journal_access_db(handle, INODE_CACHE(dir), dirdata_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
memcpy(dirdata_bh->b_data, di->id2.i_data.id_data, i_size_read(dir));
memset(dirdata_bh->b_data + i_size_read(dir), 0,
sb->s_blocksize - i_size_read(dir));
i = ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir), dir);
if (ocfs2_new_dir_wants_trailer(dir)) {
/*
* Prepare the dir trailer up front. It will otherwise look
* like a valid dirent. Even if inserting the index fails
* (unlikely), then all we'll have done is given first dir
* block a small amount of fragmentation.
*/
ocfs2_init_dir_trailer(dir, dirdata_bh, i);
}
ocfs2_update_inode_fsync_trans(handle, dir, 1);
ocfs2_journal_dirty(handle, dirdata_bh);
if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) {
/*
* Dx dirs with an external cluster need to do this up
* front. Inline dx root's get handled later, after
* we've allocated our root block. We get passed back
* a total number of items so that dr_num_entries can
* be correctly set once the dx_root has been
* allocated.
*/
ret = ocfs2_dx_dir_index_block(dir, handle, dx_leaves,
num_dx_leaves, &num_dx_entries,
dirdata_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
}
/*
* Set extent, i_size, etc on the directory. After this, the
* inode should contain the same exact dirents as before and
* be fully accessible from system calls.
*
* We let the later dirent insert modify c/mtime - to the user
* the data hasn't changed.
*/
ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
spin_lock(&oi->ip_lock);
oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL;
di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
spin_unlock(&oi->ip_lock);
ocfs2_dinode_new_extent_list(dir, di);
i_size_write(dir, sb->s_blocksize);
dir->i_mtime = dir->i_ctime = current_time(dir);
di->i_size = cpu_to_le64(sb->s_blocksize);
di->i_ctime = di->i_mtime = cpu_to_le64(dir->i_ctime.tv_sec);
di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(dir->i_ctime.tv_nsec);
ocfs2_update_inode_fsync_trans(handle, dir, 1);
/*
* This should never fail as our extent list is empty and all
* related blocks have been journaled already.
*/
ret = ocfs2_insert_extent(handle, &et, 0, blkno, len,
0, NULL);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
/*
* Set i_blocks after the extent insert for the most up to
* date ip_clusters value.
*/
dir->i_blocks = ocfs2_inode_sector_count(dir);
ocfs2_journal_dirty(handle, di_bh);
if (ocfs2_supports_indexed_dirs(osb)) {
ret = ocfs2_dx_dir_attach_index(osb, handle, dir, di_bh,
dirdata_bh, meta_ac, dx_inline,
num_dx_entries, &dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
if (dx_inline) {
ocfs2_dx_dir_index_root_block(dir, dx_root_bh,
dirdata_bh);
} else {
ocfs2_init_dx_root_extent_tree(&dx_et,
INODE_CACHE(dir),
dx_root_bh);
ret = ocfs2_insert_extent(handle, &dx_et, 0,
dx_insert_blkno, 1, 0, NULL);
if (ret)
mlog_errno(ret);
}
}
/*
* We asked for two clusters, but only got one in the 1st
* pass. Claim the 2nd cluster as a separate extent.
*/
if (alloc > len) {
ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off,
&len);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
ret = ocfs2_insert_extent(handle, &et, 1,
blkno, len, 0, NULL);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
}
*first_block_bh = dirdata_bh;
dirdata_bh = NULL;
if (ocfs2_supports_indexed_dirs(osb)) {
unsigned int off;
if (!dx_inline) {
/*
* We need to return the correct block within the
* cluster which should hold our entry.
*/
off = ocfs2_dx_dir_hash_idx(osb,
&lookup->dl_hinfo);
get_bh(dx_leaves[off]);
lookup->dl_dx_leaf_bh = dx_leaves[off];
}
lookup->dl_dx_root_bh = dx_root_bh;
dx_root_bh = NULL;
}
out_commit:
if (ret < 0 && did_quota)
dquot_free_space_nodirty(dir, bytes_allocated);
ocfs2_commit_trans(osb, handle);
out:
up_write(&oi->ip_alloc_sem);
if (data_ac)
ocfs2_free_alloc_context(data_ac);
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
if (dx_leaves) {
for (i = 0; i < num_dx_leaves; i++)
brelse(dx_leaves[i]);
kfree(dx_leaves);
}
brelse(dirdata_bh);
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;
status = dquot_alloc_space_nodirty(dir,
ocfs2_clusters_to_bytes(sb, 1));
if (status)
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 = -ENOMEM;
mlog_errno(status);
goto bail;
}
status = 0;
bail:
if (did_quota && status < 0)
dquot_free_space_nodirty(dir, ocfs2_clusters_to_bytes(sb, 1));
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.
*
* If the directory is already indexed, dx_root_bh must be provided.
*/
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;
struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
/*
* This would be a code error as an inline directory should
* never have an index root.
*/
BUG_ON(dx_root_bh);
status = ocfs2_expand_inline_dir(dir, parent_fe_bh,
blocks_wanted, lookup,
&new_bh);
if (status) {
mlog_errno(status);
goto bail;
}
/* Expansion from inline to an indexed directory will
* have given us this. */
dx_root_bh = lookup->dl_dx_root_bh;
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;
down_write(&OCFS2_I(dir)->ip_alloc_sem);
drop_alloc_sem = 1;
dir_i_size = i_size_read(dir);
credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
goto do_extend;
}
down_write(&OCFS2_I(dir)->ip_alloc_sem);
drop_alloc_sem = 1;
dir_i_size = i_size_read(dir);
trace_ocfs2_extend_dir((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, INODE_CACHE(dir),
parent_fe_bh);
num_free_extents = ocfs2_num_free_extents(&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;
}
if (ocfs2_dir_resv_allowed(osb))
data_ac->ac_resv = &OCFS2_I(dir)->ip_la_data_resv;
credits = ocfs2_calc_extend_credits(sb, el);
} else {
spin_unlock(&OCFS2_I(dir)->ip_lock);
credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
}
do_extend:
if (ocfs2_dir_indexed(dir))
credits++; /* For attaching the new dirent block to the
* dx_root */
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(INODE_CACHE(dir), new_bh);
status = ocfs2_journal_access_db(handle, INODE_CACHE(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_supports_dir_trailer(dir)) {
de->rec_len = cpu_to_le16(ocfs2_dir_trailer_blk_off(sb));
ocfs2_init_dir_trailer(dir, new_bh, le16_to_cpu(de->rec_len));
if (ocfs2_dir_indexed(dir)) {
status = ocfs2_dx_dir_link_trailer(dir, handle,
dx_root_bh, new_bh);
if (status) {
mlog_errno(status);
goto bail;
}
}
} else {
de->rec_len = cpu_to_le16(sb->s_blocksize);
}
ocfs2_update_inode_fsync_trans(handle, dir, 1);
ocfs2_journal_dirty(handle, new_bh);
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 (handle)
ocfs2_commit_trans(osb, handle);
if (drop_alloc_sem)
up_write(&OCFS2_I(dir)->ip_alloc_sem);
if (data_ac)
ocfs2_free_alloc_context(data_ac);
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
brelse(new_bh);
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_new_dir_wants_trailer(dir))
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)
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)
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));
}
bail:
brelse(bh);
if (status)
mlog_errno(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;
BUG_ON(size != sizeof(*entry1));
swap(*entry1, *entry2);
}
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, *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;
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, 3);
credits += ocfs2_calc_extend_credits(osb->sb, &dx_root->dr_list);
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;
trace_ocfs2_dx_dir_rebalance((unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long long)leaf_blkno,
insert_hash);
ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(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;
}
ret = dquot_alloc_space_nodirty(dir,
ocfs2_clusters_to_bytes(dir->i_sb, 1));
if (ret)
goto out_commit;
did_quota = 1;
ret = ocfs2_journal_access_dl(handle, INODE_CACHE(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);
ocfs2_journal_dirty(handle, dx_leaf_bh);
ret = ocfs2_dx_dir_find_leaf_split(dx_leaf, leaf_cpos, insert_hash,
&split_hash);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
trace_ocfs2_dx_dir_rebalance_split(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 = ocfs2_block_to_cluster_start(dir->i_sb, leaf_blkno);
ret = ocfs2_read_dx_leaves(dir, orig_leaves_start, num_dx_leaves,
orig_dx_leaves);
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;
}
for (i = 0; i < num_dx_leaves; i++) {
ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir),
orig_dx_leaves[i],
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir),
new_dx_leaves[i],
OCFS2_JOURNAL_ACCESS_WRITE);
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)
dquot_free_space_nodirty(dir,
ocfs2_clusters_to_bytes(dir->i_sb, 1));
ocfs2_update_inode_fsync_trans(handle, dir, 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,
struct buffer_head *dx_root_bh,
const char *name, int namelen,
struct ocfs2_dir_lookup_result *lookup)
{
int ret, rebalanced = 0;
struct ocfs2_dx_root_block *dx_root;
struct buffer_head *dx_leaf_bh = NULL;
struct ocfs2_dx_leaf *dx_leaf;
u64 blkno;
u32 leaf_cpos;
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);
return ret;
}
static int ocfs2_search_dx_free_list(struct inode *dir,
struct buffer_head *dx_root_bh,
int namelen,
struct ocfs2_dir_lookup_result *lookup)
{
int ret = -ENOSPC;
struct buffer_head *leaf_bh = NULL, *prev_leaf_bh = NULL;
struct ocfs2_dir_block_trailer *db;
u64 next_block;
int rec_len = OCFS2_DIR_REC_LEN(namelen);
struct ocfs2_dx_root_block *dx_root;
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
next_block = le64_to_cpu(dx_root->dr_free_blk);
while (next_block) {
brelse(prev_leaf_bh);
prev_leaf_bh = leaf_bh;
leaf_bh = NULL;
ret = ocfs2_read_dir_block_direct(dir, next_block, &leaf_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
db = ocfs2_trailer_from_bh(leaf_bh, dir->i_sb);
if (rec_len <= le16_to_cpu(db->db_free_rec_len)) {
lookup->dl_leaf_bh = leaf_bh;
lookup->dl_prev_leaf_bh = prev_leaf_bh;
leaf_bh = NULL;
prev_leaf_bh = NULL;
break;
}
next_block = le64_to_cpu(db->db_free_next);
}
if (!next_block)
ret = -ENOSPC;
out:
brelse(leaf_bh);
brelse(prev_leaf_bh);
return ret;
}
static int ocfs2_expand_inline_dx_root(struct inode *dir,
struct buffer_head *dx_root_bh)
{
int ret, num_dx_leaves, i, j, did_quota = 0;
struct buffer_head **dx_leaves = NULL;
struct ocfs2_extent_tree et;
u64 insert_blkno;
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
handle_t *handle = NULL;
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dx_entry_list *entry_list;
struct ocfs2_dx_entry *dx_entry;
struct ocfs2_dx_leaf *target_leaf;
ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
if (ret) {
mlog_errno(ret);
goto out;
}
dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, &num_dx_leaves);
if (!dx_leaves) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
handle = ocfs2_start_trans(osb, ocfs2_calc_dxi_expand_credits(osb->sb));
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out;
}
ret = dquot_alloc_space_nodirty(dir,
ocfs2_clusters_to_bytes(osb->sb, 1));
if (ret)
goto out_commit;
did_quota = 1;
/*
* We do this up front, before the allocation, so that a
* failure to add the dx_root_bh to the journal won't result
* us losing clusters.
*/
ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = __ocfs2_dx_dir_new_cluster(dir, 0, handle, data_ac, dx_leaves,
num_dx_leaves, &insert_blkno);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
/*
* Transfer the entries from our dx_root into the appropriate
* block
*/
dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
entry_list = &dx_root->dr_entries;
for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) {
dx_entry = &entry_list->de_entries[i];
j = __ocfs2_dx_dir_hash_idx(osb,
le32_to_cpu(dx_entry->dx_minor_hash));
target_leaf = (struct ocfs2_dx_leaf *)dx_leaves[j]->b_data;
ocfs2_dx_dir_leaf_insert_tail(target_leaf, dx_entry);
/* Each leaf has been passed to the journal already
* via __ocfs2_dx_dir_new_cluster() */
}
dx_root->dr_flags &= ~OCFS2_DX_FLAG_INLINE;
memset(&dx_root->dr_list, 0, osb->sb->s_blocksize -
offsetof(struct ocfs2_dx_root_block, dr_list));
dx_root->dr_list.l_count =
cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb));
/* This should never fail considering we start with an empty
* dx_root. */
ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh);
ret = ocfs2_insert_extent(handle, &et, 0, insert_blkno, 1, 0, NULL);
if (ret)
mlog_errno(ret);
did_quota = 0;
ocfs2_update_inode_fsync_trans(handle, dir, 1);
ocfs2_journal_dirty(handle, dx_root_bh);
out_commit:
if (ret < 0 && did_quota)
dquot_free_space_nodirty(dir,
ocfs2_clusters_to_bytes(dir->i_sb, 1));
ocfs2_commit_trans(osb, handle);
out:
if (data_ac)
ocfs2_free_alloc_context(data_ac);
if (dx_leaves) {
for (i = 0; i < num_dx_leaves; i++)
brelse(dx_leaves[i]);
kfree(dx_leaves);
}
return ret;
}
static int ocfs2_inline_dx_has_space(struct buffer_head *dx_root_bh)
{
struct ocfs2_dx_root_block *dx_root;
struct ocfs2_dx_entry_list *entry_list;
dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
entry_list = &dx_root->dr_entries;
if (le16_to_cpu(entry_list->de_num_used) >=
le16_to_cpu(entry_list->de_count))
return -ENOSPC;
return 0;
}
static int ocfs2_prepare_dx_dir_for_insert(struct inode *dir,
struct buffer_head *di_bh,
const char *name,
int namelen,
struct ocfs2_dir_lookup_result *lookup)
{
int ret, free_dx_root = 1;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct buffer_head *dx_root_bh = NULL;
struct buffer_head *leaf_bh = NULL;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
struct ocfs2_dx_root_block *dx_root;
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;
if (le32_to_cpu(dx_root->dr_num_entries) == OCFS2_DX_ENTRIES_MAX) {
ret = -ENOSPC;
mlog_errno(ret);
goto out;
}
if (ocfs2_dx_root_inline(dx_root)) {
ret = ocfs2_inline_dx_has_space(dx_root_bh);
if (ret == 0)
goto search_el;
/*
* We ran out of room in the root block. Expand it to
* an extent, then allow ocfs2_find_dir_space_dx to do
* the rest.
*/
ret = ocfs2_expand_inline_dx_root(dir, dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
}
/*
* Insert preparation for an indexed directory is split into two
* steps. The call to find_dir_space_dx reserves room in the index for
* an additional item. If we run out of space there, it's a real error
* we can't continue on.
*/
ret = ocfs2_find_dir_space_dx(osb, dir, di_bh, dx_root_bh, name,
namelen, lookup);
if (ret) {
mlog_errno(ret);
goto out;
}
search_el:
/*
* Next, we need to find space in the unindexed tree. This call
* searches using the free space linked list. If the unindexed tree
* lacks sufficient space, we'll expand it below. The expansion code
* is smart enough to add any new blocks to the free space list.
*/
ret = ocfs2_search_dx_free_list(dir, dx_root_bh, namelen, lookup);
if (ret && ret != -ENOSPC) {
mlog_errno(ret);
goto out;
}
/* Do this up here - ocfs2_extend_dir might need the dx_root */
lookup->dl_dx_root_bh = dx_root_bh;
free_dx_root = 0;
if (ret == -ENOSPC) {
ret = ocfs2_extend_dir(osb, dir, di_bh, 1, lookup, &leaf_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* We make the assumption here that new leaf blocks are added
* to the front of our free list.
*/
lookup->dl_prev_leaf_bh = NULL;
lookup->dl_leaf_bh = leaf_bh;
}
out:
if (free_dx_root)
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;
trace_ocfs2_prepare_dir_for_insert(
(unsigned long long)OCFS2_I(dir)->ip_blkno, namelen);
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_prepare_dx_dir_for_insert(dir, parent_fe_bh,
name, namelen, lookup);
if (ret)
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,
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;
}
inode_lock(dx_alloc_inode);
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, INODE_CACHE(dir), di_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
spin_lock(&OCFS2_I(dir)->ip_lock);
OCFS2_I(dir)->ip_dyn_features &= ~OCFS2_INDEXED_DIR_FL;
di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
spin_unlock(&OCFS2_I(dir)->ip_lock);
di->i_dx_root = cpu_to_le64(0ULL);
ocfs2_update_inode_fsync_trans(handle, dir, 1);
ocfs2_journal_dirty(handle, di_bh);
blk = le64_to_cpu(dx_root->dr_blkno);
bit = le16_to_cpu(dx_root->dr_suballoc_bit);
if (dx_root->dr_suballoc_loc)
bg_blkno = le64_to_cpu(dx_root->dr_suballoc_loc);
else
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:
inode_unlock(dx_alloc_inode);
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 clen;
u32 major_hash = UINT_MAX, p_cpos, cpos;
u64 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;
}
dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
if (ocfs2_dx_root_inline(dx_root))
goto remove_index;
ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh);
/* 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, 0,
&dealloc, 0, false);
if (ret) {
mlog_errno(ret);
goto out;
}
if (cpos == 0)
break;
major_hash = cpos - 1;
}
remove_index:
ret = ocfs2_dx_dir_remove_index(dir, di_bh, dx_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
ocfs2_remove_from_cache(INODE_CACHE(dir), dx_root_bh);
out:
ocfs2_schedule_truncate_log_flush(osb, 1);
ocfs2_run_deallocs(osb, &dealloc);
brelse(dx_root_bh);
return ret;
}
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