OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
linux/fs/gfs2/dir.c

2107 lines
47 KiB
C
Raw Blame History

/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License v.2.
*/
/*
* Implements Extendible Hashing as described in:
* "Extendible Hashing" by Fagin, et al in
* __ACM Trans. on Database Systems__, Sept 1979.
*
*
* Here's the layout of dirents which is essentially the same as that of ext2
* within a single block. The field de_name_len is the number of bytes
* actually required for the name (no null terminator). The field de_rec_len
* is the number of bytes allocated to the dirent. The offset of the next
* dirent in the block is (dirent + dirent->de_rec_len). When a dirent is
* deleted, the preceding dirent inherits its allocated space, ie
* prev->de_rec_len += deleted->de_rec_len. Since the next dirent is obtained
* by adding de_rec_len to the current dirent, this essentially causes the
* deleted dirent to get jumped over when iterating through all the dirents.
*
* When deleting the first dirent in a block, there is no previous dirent so
* the field de_ino is set to zero to designate it as deleted. When allocating
* a dirent, gfs2_dirent_alloc iterates through the dirents in a block. If the
* first dirent has (de_ino == 0) and de_rec_len is large enough, this first
* dirent is allocated. Otherwise it must go through all the 'used' dirents
* searching for one in which the amount of total space minus the amount of
* used space will provide enough space for the new dirent.
*
* There are two types of blocks in which dirents reside. In a stuffed dinode,
* the dirents begin at offset sizeof(struct gfs2_dinode) from the beginning of
* the block. In leaves, they begin at offset sizeof(struct gfs2_leaf) from the
* beginning of the leaf block. The dirents reside in leaves when
*
* dip->i_di.di_flags & GFS2_DIF_EXHASH is true
*
* Otherwise, the dirents are "linear", within a single stuffed dinode block.
*
* When the dirents are in leaves, the actual contents of the directory file are
* used as an array of 64-bit block pointers pointing to the leaf blocks. The
* dirents are NOT in the directory file itself. There can be more than one block
* pointer in the array that points to the same leaf. In fact, when a directory
* is first converted from linear to exhash, all of the pointers point to the
* same leaf.
*
* When a leaf is completely full, the size of the hash table can be
* doubled unless it is already at the maximum size which is hard coded into
* GFS2_DIR_MAX_DEPTH. After that, leaves are chained together in a linked list,
* but never before the maximum hash table size has been reached.
*/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/sort.h>
#include <asm/semaphore.h>
#include "gfs2.h"
#include "dir.h"
#include "glock.h"
#include "inode.h"
#include "jdata.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#define IS_LEAF 1 /* Hashed (leaf) directory */
#define IS_DINODE 2 /* Linear (stuffed dinode block) directory */
#if 1
#define gfs2_disk_hash2offset(h) (((uint64_t)(h)) >> 1)
#define gfs2_dir_offset2hash(p) ((uint32_t)(((uint64_t)(p)) << 1))
#else
#define gfs2_disk_hash2offset(h) (((uint64_t)(h)))
#define gfs2_dir_offset2hash(p) ((uint32_t)(((uint64_t)(p))))
#endif
typedef int (*leaf_call_t) (struct gfs2_inode *dip,
uint32_t index, uint32_t len, uint64_t leaf_no,
void *data);
/**
* int gfs2_filecmp - Compare two filenames
* @file1: The first filename
* @file2: The second filename
* @len_of_file2: The length of the second file
*
* This routine compares two filenames and returns 1 if they are equal.
*
* Returns: 1 if the files are the same, otherwise 0.
*/
int gfs2_filecmp(struct qstr *file1, char *file2, int len_of_file2)
{
if (file1->len != len_of_file2)
return 0;
if (memcmp(file1->name, file2, file1->len))
return 0;
return 1;
}
/**
* dirent_first - Return the first dirent
* @dip: the directory
* @bh: The buffer
* @dent: Pointer to list of dirents
*
* return first dirent whether bh points to leaf or stuffed dinode
*
* Returns: IS_LEAF, IS_DINODE, or -errno
*/
static int dirent_first(struct gfs2_inode *dip, struct buffer_head *bh,
struct gfs2_dirent **dent)
{
struct gfs2_meta_header *h = (struct gfs2_meta_header *)bh->b_data;
if (be16_to_cpu(h->mh_type) == GFS2_METATYPE_LF) {
if (gfs2_meta_check(dip->i_sbd, bh))
return -EIO;
*dent = (struct gfs2_dirent *)(bh->b_data +
sizeof(struct gfs2_leaf));
return IS_LEAF;
} else {
if (gfs2_metatype_check(dip->i_sbd, bh, GFS2_METATYPE_DI))
return -EIO;
*dent = (struct gfs2_dirent *)(bh->b_data +
sizeof(struct gfs2_dinode));
return IS_DINODE;
}
}
/**
* dirent_next - Next dirent
* @dip: the directory
* @bh: The buffer
* @dent: Pointer to list of dirents
*
* Returns: 0 on success, error code otherwise
*/
static int dirent_next(struct gfs2_inode *dip, struct buffer_head *bh,
struct gfs2_dirent **dent)
{
struct gfs2_dirent *tmp, *cur;
char *bh_end;
uint32_t cur_rec_len;
cur = *dent;
bh_end = bh->b_data + bh->b_size;
cur_rec_len = be32_to_cpu(cur->de_rec_len);
if ((char *)cur + cur_rec_len >= bh_end) {
if ((char *)cur + cur_rec_len > bh_end) {
gfs2_consist_inode(dip);
return -EIO;
}
return -ENOENT;
}
tmp = (struct gfs2_dirent *)((char *)cur + cur_rec_len);
if ((char *)tmp + be32_to_cpu(tmp->de_rec_len) > bh_end) {
gfs2_consist_inode(dip);
return -EIO;
}
/* Only the first dent could ever have de_inum.no_addr == 0 */
if (!tmp->de_inum.no_addr) {
gfs2_consist_inode(dip);
return -EIO;
}
*dent = tmp;
return 0;
}
/**
* dirent_del - Delete a dirent
* @dip: The GFS2 inode
* @bh: The buffer
* @prev: The previous dirent
* @cur: The current dirent
*
*/
static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh,
struct gfs2_dirent *prev, struct gfs2_dirent *cur)
{
uint32_t cur_rec_len, prev_rec_len;
if (!cur->de_inum.no_addr) {
gfs2_consist_inode(dip);
return;
}
gfs2_trans_add_bh(dip->i_gl, bh, 1);
/* If there is no prev entry, this is the first entry in the block.
The de_rec_len is already as big as it needs to be. Just zero
out the inode number and return. */
if (!prev) {
cur->de_inum.no_addr = 0; /* No endianess worries */
return;
}
/* Combine this dentry with the previous one. */
prev_rec_len = be32_to_cpu(prev->de_rec_len);
cur_rec_len = be32_to_cpu(cur->de_rec_len);
if ((char *)prev + prev_rec_len != (char *)cur)
gfs2_consist_inode(dip);
if ((char *)cur + cur_rec_len > bh->b_data + bh->b_size)
gfs2_consist_inode(dip);
prev_rec_len += cur_rec_len;
prev->de_rec_len = cpu_to_be32(prev_rec_len);
}
/**
* gfs2_dirent_alloc - Allocate a directory entry
* @dip: The GFS2 inode
* @bh: The buffer
* @name_len: The length of the name
* @dent_out: Pointer to list of dirents
*
* Returns: 0 on success, error code otherwise
*/
int gfs2_dirent_alloc(struct gfs2_inode *dip, struct buffer_head *bh,
int name_len, struct gfs2_dirent **dent_out)
{
struct gfs2_dirent *dent, *new;
unsigned int rec_len = GFS2_DIRENT_SIZE(name_len);
unsigned int entries = 0, offset = 0;
int type;
type = dirent_first(dip, bh, &dent);
if (type < 0)
return type;
if (type == IS_LEAF) {
struct gfs2_leaf *leaf = (struct gfs2_leaf *)bh->b_data;
entries = be16_to_cpu(leaf->lf_entries);
offset = sizeof(struct gfs2_leaf);
} else {
struct gfs2_dinode *dinode = (struct gfs2_dinode *)bh->b_data;
entries = be32_to_cpu(dinode->di_entries);
offset = sizeof(struct gfs2_dinode);
}
if (!entries) {
if (dent->de_inum.no_addr) {
gfs2_consist_inode(dip);
return -EIO;
}
gfs2_trans_add_bh(dip->i_gl, bh, 1);
dent->de_rec_len = bh->b_size - offset;
dent->de_rec_len = cpu_to_be32(dent->de_rec_len);
dent->de_name_len = name_len;
*dent_out = dent;
return 0;
}
do {
uint32_t cur_rec_len, cur_name_len;
cur_rec_len = be32_to_cpu(dent->de_rec_len);
cur_name_len = dent->de_name_len;
if ((!dent->de_inum.no_addr && cur_rec_len >= rec_len) ||
(cur_rec_len >= GFS2_DIRENT_SIZE(cur_name_len) + rec_len)) {
gfs2_trans_add_bh(dip->i_gl, bh, 1);
if (dent->de_inum.no_addr) {
new = (struct gfs2_dirent *)((char *)dent +
GFS2_DIRENT_SIZE(cur_name_len));
memset(new, 0, sizeof(struct gfs2_dirent));
new->de_rec_len = cur_rec_len - GFS2_DIRENT_SIZE(cur_name_len);
new->de_rec_len = cpu_to_be32(new->de_rec_len);
new->de_name_len = name_len;
dent->de_rec_len = cur_rec_len - be32_to_cpu(new->de_rec_len);
dent->de_rec_len = cpu_to_be32(dent->de_rec_len);
*dent_out = new;
return 0;
}
dent->de_name_len = name_len;
*dent_out = dent;
return 0;
}
} while (dirent_next(dip, bh, &dent) == 0);
return -ENOSPC;
}
/**
* dirent_fits - See if we can fit a entry in this buffer
* @dip: The GFS2 inode
* @bh: The buffer
* @name_len: The length of the name
*
* Returns: 1 if it can fit, 0 otherwise
*/
static int dirent_fits(struct gfs2_inode *dip, struct buffer_head *bh,
int name_len)
{
struct gfs2_dirent *dent;
unsigned int rec_len = GFS2_DIRENT_SIZE(name_len);
unsigned int entries = 0;
int type;
type = dirent_first(dip, bh, &dent);
if (type < 0)
return type;
if (type == IS_LEAF) {
struct gfs2_leaf *leaf = (struct gfs2_leaf *)bh->b_data;
entries = be16_to_cpu(leaf->lf_entries);
} else {
struct gfs2_dinode *dinode = (struct gfs2_dinode *)bh->b_data;
entries = be32_to_cpu(dinode->di_entries);
}
if (!entries)
return 1;
do {
uint32_t cur_rec_len, cur_name_len;
cur_rec_len = be32_to_cpu(dent->de_rec_len);
cur_name_len = dent->de_name_len;
if ((!dent->de_inum.no_addr && cur_rec_len >= rec_len) ||
(cur_rec_len >= GFS2_DIRENT_SIZE(cur_name_len) + rec_len))
return 1;
} while (dirent_next(dip, bh, &dent) == 0);
return 0;
}
static int leaf_search(struct gfs2_inode *dip, struct buffer_head *bh,
struct qstr *filename, struct gfs2_dirent **dent_out,
struct gfs2_dirent **dent_prev)
{
uint32_t hash;
struct gfs2_dirent *dent, *prev = NULL;
unsigned int entries = 0;
int type;
type = dirent_first(dip, bh, &dent);
if (type < 0)
return type;
if (type == IS_LEAF) {
struct gfs2_leaf *leaf = (struct gfs2_leaf *)bh->b_data;
entries = be16_to_cpu(leaf->lf_entries);
} else if (type == IS_DINODE) {
struct gfs2_dinode *dinode = (struct gfs2_dinode *)bh->b_data;
entries = be32_to_cpu(dinode->di_entries);
}
hash = gfs2_disk_hash(filename->name, filename->len);
do {
if (!dent->de_inum.no_addr) {
prev = dent;
continue;
}
if (be32_to_cpu(dent->de_hash) == hash &&
gfs2_filecmp(filename, (char *)(dent + 1),
dent->de_name_len)) {
*dent_out = dent;
if (dent_prev)
*dent_prev = prev;
return 0;
}
prev = dent;
} while (dirent_next(dip, bh, &dent) == 0);
return -ENOENT;
}
static int get_leaf(struct gfs2_inode *dip, uint64_t leaf_no,
struct buffer_head **bhp)
{
int error;
error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_START | DIO_WAIT, bhp);
if (!error && gfs2_metatype_check(dip->i_sbd, *bhp, GFS2_METATYPE_LF))
error = -EIO;
return error;
}
/**
* get_leaf_nr - Get a leaf number associated with the index
* @dip: The GFS2 inode
* @index:
* @leaf_out:
*
* Returns: 0 on success, error code otherwise
*/
static int get_leaf_nr(struct gfs2_inode *dip, uint32_t index,
uint64_t *leaf_out)
{
uint64_t leaf_no;
int error;
error = gfs2_jdata_read_mem(dip, (char *)&leaf_no,
index * sizeof(uint64_t),
sizeof(uint64_t));
if (error != sizeof(uint64_t))
return (error < 0) ? error : -EIO;
*leaf_out = be64_to_cpu(leaf_no);
return 0;
}
static int get_first_leaf(struct gfs2_inode *dip, uint32_t index,
struct buffer_head **bh_out)
{
uint64_t leaf_no;
int error;
error = get_leaf_nr(dip, index, &leaf_no);
if (!error)
error = get_leaf(dip, leaf_no, bh_out);
return error;
}
static int get_next_leaf(struct gfs2_inode *dip, struct buffer_head *bh_in,
struct buffer_head **bh_out)
{
struct gfs2_leaf *leaf;
int error;
leaf = (struct gfs2_leaf *)bh_in->b_data;
if (!leaf->lf_next)
error = -ENOENT;
else
error = get_leaf(dip, be64_to_cpu(leaf->lf_next), bh_out);
return error;
}
static int linked_leaf_search(struct gfs2_inode *dip, struct qstr *filename,
struct gfs2_dirent **dent_out,
struct gfs2_dirent **dent_prev,
struct buffer_head **bh_out)
{
struct buffer_head *bh = NULL, *bh_next;
uint32_t hsize, index;
uint32_t hash;
int error;
hsize = 1 << dip->i_di.di_depth;
if (hsize * sizeof(uint64_t) != dip->i_di.di_size) {
gfs2_consist_inode(dip);
return -EIO;
}
/* Figure out the address of the leaf node. */
hash = gfs2_disk_hash(filename->name, filename->len);
index = hash >> (32 - dip->i_di.di_depth);
error = get_first_leaf(dip, index, &bh_next);
if (error)
return error;
/* Find the entry */
do {
brelse(bh);
bh = bh_next;
error = leaf_search(dip, bh, filename, dent_out, dent_prev);
switch (error) {
case 0:
*bh_out = bh;
return 0;
case -ENOENT:
break;
default:
brelse(bh);
return error;
}
error = get_next_leaf(dip, bh, &bh_next);
}
while (!error);
brelse(bh);
return error;
}
/**
* dir_make_exhash - Convert a stuffed directory into an ExHash directory
* @dip: The GFS2 inode
*
* Returns: 0 on success, error code otherwise
*/
static int dir_make_exhash(struct gfs2_inode *dip)
{
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_dirent *dent;
struct buffer_head *bh, *dibh;
struct gfs2_leaf *leaf;
int y;
uint32_t x;
uint64_t *lp, bn;
int error;
error = gfs2_meta_inode_buffer(dip, &dibh);
if (error)
return error;
/* Allocate a new block for the first leaf node */
bn = gfs2_alloc_meta(dip);
/* Turn over a new leaf */
bh = gfs2_meta_new(dip->i_gl, bn);
gfs2_trans_add_bh(dip->i_gl, bh, 1);
gfs2_metatype_set(bh, GFS2_METATYPE_LF, GFS2_FORMAT_LF);
gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
/* Fill in the leaf structure */
leaf = (struct gfs2_leaf *)bh->b_data;
gfs2_assert(sdp, dip->i_di.di_entries < (1 << 16));
leaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE);
leaf->lf_entries = cpu_to_be16(dip->i_di.di_entries);
/* Copy dirents */
gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_leaf), dibh,
sizeof(struct gfs2_dinode));
/* Find last entry */
x = 0;
dirent_first(dip, bh, &dent);
do {
if (!dent->de_inum.no_addr)
continue;
if (++x == dip->i_di.di_entries)
break;
}
while (dirent_next(dip, bh, &dent) == 0);
/* Adjust the last dirent's record length
(Remember that dent still points to the last entry.) */
dent->de_rec_len = be32_to_cpu(dent->de_rec_len) +
sizeof(struct gfs2_dinode) -
sizeof(struct gfs2_leaf);
dent->de_rec_len = cpu_to_be32(dent->de_rec_len);
brelse(bh);
/* We're done with the new leaf block, now setup the new
hash table. */
gfs2_trans_add_bh(dip->i_gl, dibh, 1);
gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
lp = (uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode));
for (x = sdp->sd_hash_ptrs; x--; lp++)
*lp = cpu_to_be64(bn);
dip->i_di.di_size = sdp->sd_sb.sb_bsize / 2;
dip->i_di.di_blocks++;
dip->i_di.di_flags |= GFS2_DIF_EXHASH;
dip->i_di.di_payload_format = 0;
for (x = sdp->sd_hash_ptrs, y = -1; x; x >>= 1, y++) ;
dip->i_di.di_depth = y;
gfs2_dinode_out(&dip->i_di, dibh->b_data);
brelse(dibh);
return 0;
}
/**
* dir_split_leaf - Split a leaf block into two
* @dip: The GFS2 inode
* @index:
* @leaf_no:
*
* Returns: 0 on success, error code on failure
*/
static int dir_split_leaf(struct gfs2_inode *dip, uint32_t index,
uint64_t leaf_no)
{
struct buffer_head *nbh, *obh, *dibh;
struct gfs2_leaf *nleaf, *oleaf;
struct gfs2_dirent *dent, *prev = NULL, *next = NULL, *new;
uint32_t start, len, half_len, divider;
uint64_t bn, *lp;
uint32_t name_len;
int x, moved = 0;
int error;
/* Allocate the new leaf block */
bn = gfs2_alloc_meta(dip);
/* Get the new leaf block */
nbh = gfs2_meta_new(dip->i_gl, bn);
gfs2_trans_add_bh(dip->i_gl, nbh, 1);
gfs2_metatype_set(nbh, GFS2_METATYPE_LF, GFS2_FORMAT_LF);
gfs2_buffer_clear_tail(nbh, sizeof(struct gfs2_meta_header));
nleaf = (struct gfs2_leaf *)nbh->b_data;
nleaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE);
/* Get the old leaf block */
error = get_leaf(dip, leaf_no, &obh);
if (error)
goto fail;
gfs2_trans_add_bh(dip->i_gl, obh, 1);
oleaf = (struct gfs2_leaf *)obh->b_data;
/* Compute the start and len of leaf pointers in the hash table. */
len = 1 << (dip->i_di.di_depth - be16_to_cpu(oleaf->lf_depth));
half_len = len >> 1;
if (!half_len) {
gfs2_consist_inode(dip);
error = -EIO;
goto fail_brelse;
}
start = (index & ~(len - 1));
/* Change the pointers.
Don't bother distinguishing stuffed from non-stuffed.
This code is complicated enough already. */
lp = kcalloc(half_len, sizeof(uint64_t), GFP_KERNEL | __GFP_NOFAIL);
error = gfs2_jdata_read_mem(dip, (char *)lp, start * sizeof(uint64_t),
half_len * sizeof(uint64_t));
if (error != half_len * sizeof(uint64_t)) {
if (error >= 0)
error = -EIO;
goto fail_lpfree;
}
/* Change the pointers */
for (x = 0; x < half_len; x++)
lp[x] = cpu_to_be64(bn);
error = gfs2_jdata_write_mem(dip, (char *)lp, start * sizeof(uint64_t),
half_len * sizeof(uint64_t));
if (error != half_len * sizeof(uint64_t)) {
if (error >= 0)
error = -EIO;
goto fail_lpfree;
}
kfree(lp);
/* Compute the divider */
divider = (start + half_len) << (32 - dip->i_di.di_depth);
/* Copy the entries */
dirent_first(dip, obh, &dent);
do {
next = dent;
if (dirent_next(dip, obh, &next))
next = NULL;
if (dent->de_inum.no_addr &&
be32_to_cpu(dent->de_hash) < divider) {
name_len = dent->de_name_len;
gfs2_dirent_alloc(dip, nbh, name_len, &new);
new->de_inum = dent->de_inum; /* No endian worries */
new->de_hash = dent->de_hash; /* No endian worries */
new->de_type = dent->de_type; /* No endian worries */
memcpy((char *)(new + 1), (char *)(dent + 1),
name_len);
nleaf->lf_entries = be16_to_cpu(nleaf->lf_entries)+1;
nleaf->lf_entries = cpu_to_be16(nleaf->lf_entries);
dirent_del(dip, obh, prev, dent);
if (!oleaf->lf_entries)
gfs2_consist_inode(dip);
oleaf->lf_entries = be16_to_cpu(oleaf->lf_entries)-1;
oleaf->lf_entries = cpu_to_be16(oleaf->lf_entries);
if (!prev)
prev = dent;
moved = 1;
} else
prev = dent;
dent = next;
}
while (dent);
/* If none of the entries got moved into the new leaf,
artificially fill in the first entry. */
if (!moved) {
gfs2_dirent_alloc(dip, nbh, 0, &new);
new->de_inum.no_addr = 0;
}
oleaf->lf_depth = be16_to_cpu(oleaf->lf_depth) + 1;
oleaf->lf_depth = cpu_to_be16(oleaf->lf_depth);
nleaf->lf_depth = oleaf->lf_depth;
error = gfs2_meta_inode_buffer(dip, &dibh);
if (!gfs2_assert_withdraw(dip->i_sbd, !error)) {
dip->i_di.di_blocks++;
gfs2_dinode_out(&dip->i_di, dibh->b_data);
brelse(dibh);
}
brelse(obh);
brelse(nbh);
return error;
fail_lpfree:
kfree(lp);
fail_brelse:
brelse(obh);
fail:
brelse(nbh);
return error;
}
/**
* dir_double_exhash - Double size of ExHash table
* @dip: The GFS2 dinode
*
* Returns: 0 on success, error code on failure
*/
static int dir_double_exhash(struct gfs2_inode *dip)
{
struct gfs2_sbd *sdp = dip->i_sbd;
struct buffer_head *dibh;
uint32_t hsize;
uint64_t *buf;
uint64_t *from, *to;
uint64_t block;
int x;
int error = 0;
hsize = 1 << dip->i_di.di_depth;
if (hsize * sizeof(uint64_t) != dip->i_di.di_size) {
gfs2_consist_inode(dip);
return -EIO;
}
/* Allocate both the "from" and "to" buffers in one big chunk */
buf = kcalloc(3, sdp->sd_hash_bsize, GFP_KERNEL | __GFP_NOFAIL);
for (block = dip->i_di.di_size >> sdp->sd_hash_bsize_shift; block--;) {
error = gfs2_jdata_read_mem(dip, (char *)buf,
block * sdp->sd_hash_bsize,
sdp->sd_hash_bsize);
if (error != sdp->sd_hash_bsize) {
if (error >= 0)
error = -EIO;
goto fail;
}
from = buf;
to = (uint64_t *)((char *)buf + sdp->sd_hash_bsize);
for (x = sdp->sd_hash_ptrs; x--; from++) {
*to++ = *from; /* No endianess worries */
*to++ = *from;
}
error = gfs2_jdata_write_mem(dip,
(char *)buf + sdp->sd_hash_bsize,
block * sdp->sd_sb.sb_bsize,
sdp->sd_sb.sb_bsize);
if (error != sdp->sd_sb.sb_bsize) {
if (error >= 0)
error = -EIO;
goto fail;
}
}
kfree(buf);
error = gfs2_meta_inode_buffer(dip, &dibh);
if (!gfs2_assert_withdraw(sdp, !error)) {
dip->i_di.di_depth++;
gfs2_dinode_out(&dip->i_di, dibh->b_data);
brelse(dibh);
}
return error;
fail:
kfree(buf);
return error;
}
/**
* compare_dents - compare directory entries by hash value
* @a: first dent
* @b: second dent
*
* When comparing the hash entries of @a to @b:
* gt: returns 1
* lt: returns -1
* eq: returns 0
*/
static int compare_dents(const void *a, const void *b)
{
struct gfs2_dirent *dent_a, *dent_b;
uint32_t hash_a, hash_b;
int ret = 0;
dent_a = *(struct gfs2_dirent **)a;
hash_a = dent_a->de_hash;
hash_a = be32_to_cpu(hash_a);
dent_b = *(struct gfs2_dirent **)b;
hash_b = dent_b->de_hash;
hash_b = be32_to_cpu(hash_b);
if (hash_a > hash_b)
ret = 1;
else if (hash_a < hash_b)
ret = -1;
else {
unsigned int len_a = dent_a->de_name_len;
unsigned int len_b = dent_b->de_name_len;
if (len_a > len_b)
ret = 1;
else if (len_a < len_b)
ret = -1;
else
ret = memcmp((char *)(dent_a + 1),
(char *)(dent_b + 1),
len_a);
}
return ret;
}
/**
* do_filldir_main - read out directory entries
* @dip: The GFS2 inode
* @offset: The offset in the file to read from
* @opaque: opaque data to pass to filldir
* @filldir: The function to pass entries to
* @darr: an array of struct gfs2_dirent pointers to read
* @entries: the number of entries in darr
* @copied: pointer to int that's non-zero if a entry has been copied out
*
* Jump through some hoops to make sure that if there are hash collsions,
* they are read out at the beginning of a buffer. We want to minimize
* the possibility that they will fall into different readdir buffers or
* that someone will want to seek to that location.
*
* Returns: errno, >0 on exception from filldir
*/
static int do_filldir_main(struct gfs2_inode *dip, uint64_t *offset,
void *opaque, gfs2_filldir_t filldir,
struct gfs2_dirent **darr, uint32_t entries,
int *copied)
{
struct gfs2_dirent *dent, *dent_next;
struct gfs2_inum inum;
uint64_t off, off_next;
unsigned int x, y;
int run = 0;
int error = 0;
sort(darr, entries, sizeof(struct gfs2_dirent *), compare_dents, NULL);
dent_next = darr[0];
off_next = be32_to_cpu(dent_next->de_hash);
off_next = gfs2_disk_hash2offset(off_next);
for (x = 0, y = 1; x < entries; x++, y++) {
dent = dent_next;
off = off_next;
if (y < entries) {
dent_next = darr[y];
off_next = be32_to_cpu(dent_next->de_hash);
off_next = gfs2_disk_hash2offset(off_next);
if (off < *offset)
continue;
*offset = off;
if (off_next == off) {
if (*copied && !run)
return 1;
run = 1;
} else
run = 0;
} else {
if (off < *offset)
continue;
*offset = off;
}
gfs2_inum_in(&inum, (char *)&dent->de_inum);
error = filldir(opaque, (char *)(dent + 1),
dent->de_name_len,
off, &inum,
dent->de_type);
if (error)
return 1;
*copied = 1;
}
/* Increment the *offset by one, so the next time we come into the
do_filldir fxn, we get the next entry instead of the last one in the
current leaf */
(*offset)++;
return 0;
}
/**
* do_filldir_single - Read directory entries out of a single block
* @dip: The GFS2 inode
* @offset: The offset in the file to read from
* @opaque: opaque data to pass to filldir
* @filldir: The function to pass entries to
* @bh: the block
* @entries: the number of entries in the block
* @copied: pointer to int that's non-zero if a entry has been copied out
*
* Returns: errno, >0 on exception from filldir
*/
static int do_filldir_single(struct gfs2_inode *dip, uint64_t *offset,
void *opaque, gfs2_filldir_t filldir,
struct buffer_head *bh, uint32_t entries,
int *copied)
{
struct gfs2_dirent **darr;
struct gfs2_dirent *de;
unsigned int e = 0;
int error;
if (!entries)
return 0;
darr = kcalloc(entries, sizeof(struct gfs2_dirent *), GFP_KERNEL);
if (!darr)
return -ENOMEM;
dirent_first(dip, bh, &de);
do {
if (!de->de_inum.no_addr)
continue;
if (e >= entries) {
gfs2_consist_inode(dip);
error = -EIO;
goto out;
}
darr[e++] = de;
}
while (dirent_next(dip, bh, &de) == 0);
if (e != entries) {
gfs2_consist_inode(dip);
error = -EIO;
goto out;
}
error = do_filldir_main(dip, offset, opaque, filldir, darr,
entries, copied);
out:
kfree(darr);
return error;
}
/**
* do_filldir_multi - Read directory entries out of a linked leaf list
* @dip: The GFS2 inode
* @offset: The offset in the file to read from
* @opaque: opaque data to pass to filldir
* @filldir: The function to pass entries to
* @bh: the first leaf in the list
* @copied: pointer to int that's non-zero if a entry has been copied out
*
* Returns: errno, >0 on exception from filldir
*/
static int do_filldir_multi(struct gfs2_inode *dip, uint64_t *offset,
void *opaque, gfs2_filldir_t filldir,
struct buffer_head *bh, int *copied)
{
struct buffer_head **larr = NULL;
struct gfs2_dirent **darr;
struct gfs2_leaf *leaf;
struct buffer_head *tmp_bh;
struct gfs2_dirent *de;
unsigned int entries, e = 0;
unsigned int leaves = 0, l = 0;
unsigned int x;
uint64_t ln;
int error = 0;
/* Count leaves and entries */
leaf = (struct gfs2_leaf *)bh->b_data;
entries = be16_to_cpu(leaf->lf_entries);
ln = leaf->lf_next;
while (ln) {
ln = be64_to_cpu(ln);
error = get_leaf(dip, ln, &tmp_bh);
if (error)
return error;
leaf = (struct gfs2_leaf *)tmp_bh->b_data;
if (leaf->lf_entries) {
entries += be16_to_cpu(leaf->lf_entries);
leaves++;
}
ln = leaf->lf_next;
brelse(tmp_bh);
}
if (!entries)
return 0;
if (leaves) {
larr = kcalloc(leaves, sizeof(struct buffer_head *),GFP_KERNEL);
if (!larr)
return -ENOMEM;
}
darr = kcalloc(entries, sizeof(struct gfs2_dirent *), GFP_KERNEL);
if (!darr) {
kfree(larr);
return -ENOMEM;
}
leaf = (struct gfs2_leaf *)bh->b_data;
if (leaf->lf_entries) {
dirent_first(dip, bh, &de);
do {
if (!de->de_inum.no_addr)
continue;
if (e >= entries) {
gfs2_consist_inode(dip);
error = -EIO;
goto out;
}
darr[e++] = de;
}
while (dirent_next(dip, bh, &de) == 0);
}
ln = leaf->lf_next;
while (ln) {
ln = be64_to_cpu(ln);
error = get_leaf(dip, ln, &tmp_bh);
if (error)
goto out;
leaf = (struct gfs2_leaf *)tmp_bh->b_data;
if (leaf->lf_entries) {
dirent_first(dip, tmp_bh, &de);
do {
if (!de->de_inum.no_addr)
continue;
if (e >= entries) {
gfs2_consist_inode(dip);
error = -EIO;
goto out;
}
darr[e++] = de;
}
while (dirent_next(dip, tmp_bh, &de) == 0);
larr[l++] = tmp_bh;
ln = leaf->lf_next;
} else {
ln = leaf->lf_next;
brelse(tmp_bh);
}
}
if (gfs2_assert_withdraw(dip->i_sbd, l == leaves)) {
error = -EIO;
goto out;
}
if (e != entries) {
gfs2_consist_inode(dip);
error = -EIO;
goto out;
}
error = do_filldir_main(dip, offset, opaque, filldir, darr,
entries, copied);
out:
kfree(darr);
for (x = 0; x < l; x++)
brelse(larr[x]);
kfree(larr);
return error;
}
/**
* dir_e_search - Search exhash (leaf) dir for inode matching name
* @dip: The GFS2 inode
* @filename: Filename string
* @inode: If non-NULL, function fills with formal inode # and block address
* @type: If non-NULL, function fills with DT_... dinode type
*
* Returns:
*/
static int dir_e_search(struct gfs2_inode *dip, struct qstr *filename,
struct gfs2_inum *inum, unsigned int *type)
{
struct buffer_head *bh;
struct gfs2_dirent *dent;
int error;
error = linked_leaf_search(dip, filename, &dent, NULL, &bh);
if (error)
return error;
if (inum)
gfs2_inum_in(inum, (char *)&dent->de_inum);
if (type)
*type = dent->de_type;
brelse(bh);
return 0;
}
static int dir_e_add(struct gfs2_inode *dip, struct qstr *filename,
struct gfs2_inum *inum, unsigned int type)
{
struct buffer_head *bh, *nbh, *dibh;
struct gfs2_leaf *leaf, *nleaf;
struct gfs2_dirent *dent;
uint32_t hsize, index;
uint32_t hash;
uint64_t leaf_no, bn;
int error;
restart:
hsize = 1 << dip->i_di.di_depth;
if (hsize * sizeof(uint64_t) != dip->i_di.di_size) {
gfs2_consist_inode(dip);
return -EIO;
}
/* Figure out the address of the leaf node. */
hash = gfs2_disk_hash(filename->name, filename->len);
index = hash >> (32 - dip->i_di.di_depth);
error = get_leaf_nr(dip, index, &leaf_no);
if (error)
return error;
/* Add entry to the leaf */
for (;;) {
error = get_leaf(dip, leaf_no, &bh);
if (error)
return error;
leaf = (struct gfs2_leaf *)bh->b_data;
if (gfs2_dirent_alloc(dip, bh, filename->len, &dent)) {
if (be16_to_cpu(leaf->lf_depth) < dip->i_di.di_depth) {
/* Can we split the leaf? */
brelse(bh);
error = dir_split_leaf(dip, index, leaf_no);
if (error)
return error;
goto restart;
} else if (dip->i_di.di_depth < GFS2_DIR_MAX_DEPTH) {
/* Can we double the hash table? */
brelse(bh);
error = dir_double_exhash(dip);
if (error)
return error;
goto restart;
} else if (leaf->lf_next) {
/* Can we try the next leaf in the list? */
leaf_no = be64_to_cpu(leaf->lf_next);
brelse(bh);
continue;
} else {
/* Create a new leaf and add it to the list. */
bn = gfs2_alloc_meta(dip);
nbh = gfs2_meta_new(dip->i_gl, bn);
gfs2_trans_add_bh(dip->i_gl, nbh, 1);
gfs2_metatype_set(nbh,
GFS2_METATYPE_LF,
GFS2_FORMAT_LF);
gfs2_buffer_clear_tail(nbh,
sizeof(struct gfs2_meta_header));
gfs2_trans_add_bh(dip->i_gl, bh, 1);
leaf->lf_next = cpu_to_be64(bn);
nleaf = (struct gfs2_leaf *)nbh->b_data;
nleaf->lf_depth = leaf->lf_depth;
nleaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE);
gfs2_dirent_alloc(dip, nbh, filename->len,
&dent);
dip->i_di.di_blocks++;
brelse(bh);
bh = nbh;
leaf = nleaf;
}
}
/* If the gfs2_dirent_alloc() succeeded, it pinned the "bh" */
gfs2_inum_out(inum, (char *)&dent->de_inum);
dent->de_hash = cpu_to_be32(hash);
dent->de_type = type;
memcpy((char *)(dent + 1), filename->name, filename->len);
leaf->lf_entries = be16_to_cpu(leaf->lf_entries) + 1;
leaf->lf_entries = cpu_to_be16(leaf->lf_entries);
brelse(bh);
error = gfs2_meta_inode_buffer(dip, &dibh);
if (error)
return error;
dip->i_di.di_entries++;
dip->i_di.di_mtime = dip->i_di.di_ctime = get_seconds();
gfs2_trans_add_bh(dip->i_gl, dibh, 1);
gfs2_dinode_out(&dip->i_di, dibh->b_data);
brelse(dibh);
return 0;
}
return -ENOENT;
}
static int dir_e_del(struct gfs2_inode *dip, struct qstr *filename)
{
struct buffer_head *bh, *dibh;
struct gfs2_dirent *dent, *prev;
struct gfs2_leaf *leaf;
unsigned int entries;
int error;
error = linked_leaf_search(dip, filename, &dent, &prev, &bh);
if (error == -ENOENT) {
gfs2_consist_inode(dip);
return -EIO;
}
if (error)
return error;
dirent_del(dip, bh, prev, dent); /* Pins bh */
leaf = (struct gfs2_leaf *)bh->b_data;
entries = be16_to_cpu(leaf->lf_entries);
if (!entries)
gfs2_consist_inode(dip);
entries--;
leaf->lf_entries = cpu_to_be16(entries);
brelse(bh);
error = gfs2_meta_inode_buffer(dip, &dibh);
if (error)
return error;
if (!dip->i_di.di_entries)
gfs2_consist_inode(dip);
dip->i_di.di_entries--;
dip->i_di.di_mtime = dip->i_di.di_ctime = get_seconds();
gfs2_trans_add_bh(dip->i_gl, dibh, 1);
gfs2_dinode_out(&dip->i_di, dibh->b_data);
brelse(dibh);
return 0;
}
/**
* dir_e_read - Reads the entries from a directory into a filldir buffer
* @dip: dinode pointer
* @offset: the hash of the last entry read shifted to the right once
* @opaque: buffer for the filldir function to fill
* @filldir: points to the filldir function to use
*
* Returns: errno
*/
static int dir_e_read(struct gfs2_inode *dip, uint64_t *offset, void *opaque,
gfs2_filldir_t filldir)
{
struct gfs2_sbd *sdp = dip->i_sbd;
struct buffer_head *bh;
struct gfs2_leaf leaf;
uint32_t hsize, len;
uint32_t ht_offset, lp_offset, ht_offset_cur = -1;
uint32_t hash, index;
uint64_t *lp;
int copied = 0;
int error = 0;
hsize = 1 << dip->i_di.di_depth;
if (hsize * sizeof(uint64_t) != dip->i_di.di_size) {
gfs2_consist_inode(dip);
return -EIO;
}
hash = gfs2_dir_offset2hash(*offset);
index = hash >> (32 - dip->i_di.di_depth);
lp = kmalloc(sdp->sd_hash_bsize, GFP_KERNEL);
if (!lp)
return -ENOMEM;
while (index < hsize) {
lp_offset = index & (sdp->sd_hash_ptrs - 1);
ht_offset = index - lp_offset;
if (ht_offset_cur != ht_offset) {
error = gfs2_jdata_read_mem(dip, (char *)lp,
ht_offset * sizeof(uint64_t),
sdp->sd_hash_bsize);
if (error != sdp->sd_hash_bsize) {
if (error >= 0)
error = -EIO;
goto out;
}
ht_offset_cur = ht_offset;
}
error = get_leaf(dip, be64_to_cpu(lp[lp_offset]), &bh);
if (error)
goto out;
gfs2_leaf_in(&leaf, bh->b_data);
if (leaf.lf_next)
error = do_filldir_multi(dip, offset, opaque, filldir,
bh, &copied);
else
error = do_filldir_single(dip, offset, opaque, filldir,
bh, leaf.lf_entries, &copied);
brelse(bh);
if (error) {
if (error > 0)
error = 0;
goto out;
}
len = 1 << (dip->i_di.di_depth - leaf.lf_depth);
index = (index & ~(len - 1)) + len;
}
out:
kfree(lp);
return error;
}
static int dir_e_mvino(struct gfs2_inode *dip, struct qstr *filename,
struct gfs2_inum *inum, unsigned int new_type)
{
struct buffer_head *bh, *dibh;
struct gfs2_dirent *dent;
int error;
error = linked_leaf_search(dip, filename, &dent, NULL, &bh);
if (error == -ENOENT) {
gfs2_consist_inode(dip);
return -EIO;
}
if (error)
return error;
gfs2_trans_add_bh(dip->i_gl, bh, 1);
gfs2_inum_out(inum, (char *)&dent->de_inum);
dent->de_type = new_type;
brelse(bh);
error = gfs2_meta_inode_buffer(dip, &dibh);
if (error)
return error;
dip->i_di.di_mtime = dip->i_di.di_ctime = get_seconds();
gfs2_trans_add_bh(dip->i_gl, dibh, 1);
gfs2_dinode_out(&dip->i_di, dibh->b_data);
brelse(dibh);
return 0;
}
/**
* dir_l_search - Search linear (stuffed dinode) dir for inode matching name
* @dip: The GFS2 inode
* @filename: Filename string
* @inode: If non-NULL, function fills with formal inode # and block address
* @type: If non-NULL, function fills with DT_... dinode type
*
* Returns:
*/
static int dir_l_search(struct gfs2_inode *dip, struct qstr *filename,
struct gfs2_inum *inum, unsigned int *type)
{
struct buffer_head *dibh;
struct gfs2_dirent *dent;
int error;
if (!gfs2_is_stuffed(dip)) {
gfs2_consist_inode(dip);
return -EIO;
}
error = gfs2_meta_inode_buffer(dip, &dibh);
if (error)
return error;
error = leaf_search(dip, dibh, filename, &dent, NULL);
if (!error) {
if (inum)
gfs2_inum_in(inum, (char *)&dent->de_inum);
if (type)
*type = dent->de_type;
}
brelse(dibh);
return error;
}
static int dir_l_add(struct gfs2_inode *dip, struct qstr *filename,
struct gfs2_inum *inum, unsigned int type)
{
struct buffer_head *dibh;
struct gfs2_dirent *dent;
int error;
if (!gfs2_is_stuffed(dip)) {
gfs2_consist_inode(dip);
return -EIO;
}
error = gfs2_meta_inode_buffer(dip, &dibh);
if (error)
return error;
if (gfs2_dirent_alloc(dip, dibh, filename->len, &dent)) {
brelse(dibh);
error = dir_make_exhash(dip);
if (!error)
error = dir_e_add(dip, filename, inum, type);
return error;
}
/* gfs2_dirent_alloc() pins */
gfs2_inum_out(inum, (char *)&dent->de_inum);
dent->de_hash = gfs2_disk_hash(filename->name, filename->len);
dent->de_hash = cpu_to_be32(dent->de_hash);
dent->de_type = type;
memcpy((char *)(dent + 1), filename->name, filename->len);
dip->i_di.di_entries++;
dip->i_di.di_mtime = dip->i_di.di_ctime = get_seconds();
gfs2_dinode_out(&dip->i_di, dibh->b_data);
brelse(dibh);
return 0;
}
static int dir_l_del(struct gfs2_inode *dip, struct qstr *filename)
{
struct buffer_head *dibh;
struct gfs2_dirent *dent, *prev;
int error;
if (!gfs2_is_stuffed(dip)) {
gfs2_consist_inode(dip);
return -EIO;
}
error = gfs2_meta_inode_buffer(dip, &dibh);
if (error)
return error;
error = leaf_search(dip, dibh, filename, &dent, &prev);
if (error == -ENOENT) {
gfs2_consist_inode(dip);
error = -EIO;
goto out;
}
if (error)
goto out;
dirent_del(dip, dibh, prev, dent);
/* dirent_del() pins */
if (!dip->i_di.di_entries)
gfs2_consist_inode(dip);
dip->i_di.di_entries--;
dip->i_di.di_mtime = dip->i_di.di_ctime = get_seconds();
gfs2_dinode_out(&dip->i_di, dibh->b_data);
out:
brelse(dibh);
return error;
}
static int dir_l_read(struct gfs2_inode *dip, uint64_t *offset, void *opaque,
gfs2_filldir_t filldir)
{
struct buffer_head *dibh;
int copied = 0;
int error;
if (!gfs2_is_stuffed(dip)) {
gfs2_consist_inode(dip);
return -EIO;
}
if (!dip->i_di.di_entries)
return 0;
error = gfs2_meta_inode_buffer(dip, &dibh);
if (error)
return error;
error = do_filldir_single(dip, offset,
opaque, filldir,
dibh, dip->i_di.di_entries,
&copied);
if (error > 0)
error = 0;
brelse(dibh);
return error;
}
static int dir_l_mvino(struct gfs2_inode *dip, struct qstr *filename,
struct gfs2_inum *inum, unsigned int new_type)
{
struct buffer_head *dibh;
struct gfs2_dirent *dent;
int error;
if (!gfs2_is_stuffed(dip)) {
gfs2_consist_inode(dip);
return -EIO;
}
error = gfs2_meta_inode_buffer(dip, &dibh);
if (error)
return error;
error = leaf_search(dip, dibh, filename, &dent, NULL);
if (error == -ENOENT) {
gfs2_consist_inode(dip);
error = -EIO;
goto out;
}
if (error)
goto out;
gfs2_trans_add_bh(dip->i_gl, dibh, 1);
gfs2_inum_out(inum, (char *)&dent->de_inum);
dent->de_type = new_type;
dip->i_di.di_mtime = dip->i_di.di_ctime = get_seconds();
gfs2_dinode_out(&dip->i_di, dibh->b_data);
out:
brelse(dibh);
return error;
}
/**
* gfs2_dir_search - Search a directory
* @dip: The GFS2 inode
* @filename:
* @inode:
*
* This routine searches a directory for a file or another directory.
* Assumes a glock is held on dip.
*
* Returns: errno
*/
int gfs2_dir_search(struct gfs2_inode *dip, struct qstr *filename,
struct gfs2_inum *inum, unsigned int *type)
{
int error;
if (dip->i_di.di_flags & GFS2_DIF_EXHASH)
error = dir_e_search(dip, filename, inum, type);
else
error = dir_l_search(dip, filename, inum, type);
return error;
}
/**
* gfs2_dir_add - Add new filename into directory
* @dip: The GFS2 inode
* @filename: The new name
* @inode: The inode number of the entry
* @type: The type of the entry
*
* Returns: 0 on success, error code on failure
*/
int gfs2_dir_add(struct gfs2_inode *dip, struct qstr *filename,
struct gfs2_inum *inum, unsigned int type)
{
int error;
if (dip->i_di.di_flags & GFS2_DIF_EXHASH)
error = dir_e_add(dip, filename, inum, type);
else
error = dir_l_add(dip, filename, inum, type);
return error;
}
/**
* gfs2_dir_del - Delete a directory entry
* @dip: The GFS2 inode
* @filename: The filename
*
* Returns: 0 on success, error code on failure
*/
int gfs2_dir_del(struct gfs2_inode *dip, struct qstr *filename)
{
int error;
if (dip->i_di.di_flags & GFS2_DIF_EXHASH)
error = dir_e_del(dip, filename);
else
error = dir_l_del(dip, filename);
return error;
}
int gfs2_dir_read(struct gfs2_inode *dip, uint64_t *offset, void *opaque,
gfs2_filldir_t filldir)
{
int error;
if (dip->i_di.di_flags & GFS2_DIF_EXHASH)
error = dir_e_read(dip, offset, opaque, filldir);
else
error = dir_l_read(dip, offset, opaque, filldir);
return error;
}
/**
* gfs2_dir_mvino - Change inode number of directory entry
* @dip: The GFS2 inode
* @filename:
* @new_inode:
*
* This routine changes the inode number of a directory entry. It's used
* by rename to change ".." when a directory is moved.
* Assumes a glock is held on dvp.
*
* Returns: errno
*/
int gfs2_dir_mvino(struct gfs2_inode *dip, struct qstr *filename,
struct gfs2_inum *inum, unsigned int new_type)
{
int error;
if (dip->i_di.di_flags & GFS2_DIF_EXHASH)
error = dir_e_mvino(dip, filename, inum, new_type);
else
error = dir_l_mvino(dip, filename, inum, new_type);
return error;
}
/**
* foreach_leaf - call a function for each leaf in a directory
* @dip: the directory
* @lc: the function to call for each each
* @data: private data to pass to it
*
* Returns: errno
*/
static int foreach_leaf(struct gfs2_inode *dip, leaf_call_t lc, void *data)
{
struct gfs2_sbd *sdp = dip->i_sbd;
struct buffer_head *bh;
struct gfs2_leaf leaf;
uint32_t hsize, len;
uint32_t ht_offset, lp_offset, ht_offset_cur = -1;
uint32_t index = 0;
uint64_t *lp;
uint64_t leaf_no;
int error = 0;
hsize = 1 << dip->i_di.di_depth;
if (hsize * sizeof(uint64_t) != dip->i_di.di_size) {
gfs2_consist_inode(dip);
return -EIO;
}
lp = kmalloc(sdp->sd_hash_bsize, GFP_KERNEL);
if (!lp)
return -ENOMEM;
while (index < hsize) {
lp_offset = index & (sdp->sd_hash_ptrs - 1);
ht_offset = index - lp_offset;
if (ht_offset_cur != ht_offset) {
error = gfs2_jdata_read_mem(dip, (char *)lp,
ht_offset * sizeof(uint64_t),
sdp->sd_hash_bsize);
if (error != sdp->sd_hash_bsize) {
if (error >= 0)
error = -EIO;
goto out;
}
ht_offset_cur = ht_offset;
}
leaf_no = be64_to_cpu(lp[lp_offset]);
if (leaf_no) {
error = get_leaf(dip, leaf_no, &bh);
if (error)
goto out;
gfs2_leaf_in(&leaf, bh->b_data);
brelse(bh);
len = 1 << (dip->i_di.di_depth - leaf.lf_depth);
error = lc(dip, index, len, leaf_no, data);
if (error)
goto out;
index = (index & ~(len - 1)) + len;
} else
index++;
}
if (index != hsize) {
gfs2_consist_inode(dip);
error = -EIO;
}
out:
kfree(lp);
return error;
}
/**
* leaf_dealloc - Deallocate a directory leaf
* @dip: the directory
* @index: the hash table offset in the directory
* @len: the number of pointers to this leaf
* @leaf_no: the leaf number
* @data: not used
*
* Returns: errno
*/
static int leaf_dealloc(struct gfs2_inode *dip, uint32_t index, uint32_t len,
uint64_t leaf_no, void *data)
{
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_leaf tmp_leaf;
struct gfs2_rgrp_list rlist;
struct buffer_head *bh, *dibh;
uint64_t blk;
unsigned int rg_blocks = 0, l_blocks = 0;
char *ht;
unsigned int x, size = len * sizeof(uint64_t);
int error;
memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
ht = kzalloc(size, GFP_KERNEL);
if (!ht)
return -ENOMEM;
gfs2_alloc_get(dip);
error = gfs2_quota_hold(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
goto out;
error = gfs2_rindex_hold(sdp, &dip->i_alloc.al_ri_gh);
if (error)
goto out_qs;
/* Count the number of leaves */
for (blk = leaf_no; blk; blk = tmp_leaf.lf_next) {
error = get_leaf(dip, blk, &bh);
if (error)
goto out_rlist;
gfs2_leaf_in(&tmp_leaf, (bh)->b_data);
brelse(bh);
gfs2_rlist_add(sdp, &rlist, blk);
l_blocks++;
}
gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0);
for (x = 0; x < rlist.rl_rgrps; x++) {
struct gfs2_rgrpd *rgd;
rgd = get_gl2rgd(rlist.rl_ghs[x].gh_gl);
rg_blocks += rgd->rd_ri.ri_length;
}
error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
if (error)
goto out_rlist;
error = gfs2_trans_begin(sdp,
rg_blocks + (DIV_RU(size, sdp->sd_jbsize) + 1) +
RES_DINODE + RES_STATFS + RES_QUOTA, l_blocks);
if (error)
goto out_rg_gunlock;
for (blk = leaf_no; blk; blk = tmp_leaf.lf_next) {
error = get_leaf(dip, blk, &bh);
if (error)
goto out_end_trans;
gfs2_leaf_in(&tmp_leaf, bh->b_data);
brelse(bh);
gfs2_free_meta(dip, blk, 1);
if (!dip->i_di.di_blocks)
gfs2_consist_inode(dip);
dip->i_di.di_blocks--;
}
error = gfs2_jdata_write_mem(dip, ht, index * sizeof(uint64_t), size);
if (error != size) {
if (error >= 0)
error = -EIO;
goto out_end_trans;
}
error = gfs2_meta_inode_buffer(dip, &dibh);
if (error)
goto out_end_trans;
gfs2_trans_add_bh(dip->i_gl, dibh, 1);
gfs2_dinode_out(&dip->i_di, dibh->b_data);
brelse(dibh);
out_end_trans:
gfs2_trans_end(sdp);
out_rg_gunlock:
gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
out_rlist:
gfs2_rlist_free(&rlist);
gfs2_glock_dq_uninit(&dip->i_alloc.al_ri_gh);
out_qs:
gfs2_quota_unhold(dip);
out:
gfs2_alloc_put(dip);
kfree(ht);
return error;
}
/**
* gfs2_dir_exhash_dealloc - free all the leaf blocks in a directory
* @dip: the directory
*
* Dealloc all on-disk directory leaves to FREEMETA state
* Change on-disk inode type to "regular file"
*
* Returns: errno
*/
int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip)
{
struct gfs2_sbd *sdp = dip->i_sbd;
struct buffer_head *bh;
int error;
/* Dealloc on-disk leaves to FREEMETA state */
error = foreach_leaf(dip, leaf_dealloc, NULL);
if (error)
return error;
/* Make this a regular file in case we crash.
(We don't want to free these blocks a second time.) */
error = gfs2_trans_begin(sdp, RES_DINODE, 0);
if (error)
return error;
error = gfs2_meta_inode_buffer(dip, &bh);
if (!error) {
gfs2_trans_add_bh(dip->i_gl, bh, 1);
((struct gfs2_dinode *)bh->b_data)->di_mode = cpu_to_be32(S_IFREG);
brelse(bh);
}
gfs2_trans_end(sdp);
return error;
}
/**
* gfs2_diradd_alloc_required - find if adding entry will require an allocation
* @ip: the file being written to
* @filname: the filename that's going to be added
* @alloc_required: set to 1 if an alloc is required, 0 otherwise
*
* Returns: errno
*/
int gfs2_diradd_alloc_required(struct gfs2_inode *dip, struct qstr *filename,
int *alloc_required)
{
struct buffer_head *bh = NULL, *bh_next;
uint32_t hsize, hash, index;
int error = 0;
*alloc_required = 0;
if (dip->i_di.di_flags & GFS2_DIF_EXHASH) {
hsize = 1 << dip->i_di.di_depth;
if (hsize * sizeof(uint64_t) != dip->i_di.di_size) {
gfs2_consist_inode(dip);
return -EIO;
}
hash = gfs2_disk_hash(filename->name, filename->len);
index = hash >> (32 - dip->i_di.di_depth);
error = get_first_leaf(dip, index, &bh_next);
if (error)
return error;
do {
brelse(bh);
bh = bh_next;
if (dirent_fits(dip, bh, filename->len))
break;
error = get_next_leaf(dip, bh, &bh_next);
if (error == -ENOENT) {
*alloc_required = 1;
error = 0;
break;
}
}
while (!error);
brelse(bh);
} else {
error = gfs2_meta_inode_buffer(dip, &bh);
if (error)
return error;
if (!dirent_fits(dip, bh, filename->len))
*alloc_required = 1;
brelse(bh);
}
return error;
}
Reference in New Issue View Git Blame Copy Permalink