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android_kernel_xiaomi_sm8350/fs/gfs2/dir.c
Steven Whitehouse 18ec7d5c3f [GFS2] Make journaled data files identical to normal files on disk 
This is a very large patch, with a few still to be resolved issues
so you might want to check out the previous head of the tree since
this is known to be unstable. Fixes for the various bugs will be
forthcoming shortly.

This patch removes the special data format which has been used
up till now for journaled data files. Directories still retain the
old format so that they will remain on disk compatible with earlier
releases. As a result you can now do the following with journaled
data files:

 1) mmap them
 2) export them over NFS
 3) convert to/from normal files whenever you want to (the zero length
    restriction is gone)

In addition the level at which GFS' locking is done has changed for all
files (since they all now use the page cache) such that the locking is
done at the page cache level rather than the level of the fs operations.
This should mean that things like loopback mounts and other things which
touch the page cache directly should now work.

Current known issues:

 1. There is a lock mode inversion problem related to the resource
    group hold function which needs to be resolved.
 2. Any significant amount of I/O causes an oops with an offset of hex 320
    (NULL pointer dereference) which appears to be related to a journaled data
    buffer appearing on a list where it shouldn't be.
 3. Direct I/O writes are disabled for the time being (will reappear later)
 4. There is probably a deadlock between the page lock and GFS' locks under
    certain combinations of mmap and fs operation I/O.
 5. Issue relating to ref counting on internally used inodes causes a hang
    on umount (discovered before this patch, and not fixed by it)
 6. One part of the directory metadata is different from GFS1 and will need
    to be resolved before next release.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-02-08 11:50:51 +00:00

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/*
* 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 "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#include "bmap.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_dir_get_buffer(struct gfs2_inode *ip, uint64_t block, int new,
struct buffer_head **bhp)
{
struct buffer_head *bh;
int error = 0;
if (new) {
bh = gfs2_meta_new(ip->i_gl, block);
gfs2_trans_add_bh(ip->i_gl, bh, 1);
gfs2_metatype_set(bh, GFS2_METATYPE_JD, GFS2_FORMAT_JD);
gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
} else {
error = gfs2_meta_read(ip->i_gl, block, DIO_START | DIO_WAIT, &bh);
if (error)
return error;
if (gfs2_metatype_check(ip->i_sbd, bh, GFS2_METATYPE_JD)) {
brelse(bh);
return -EIO;
}
}
*bhp = bh;
return 0;
}
static int gfs2_dir_write_stuffed(struct gfs2_inode *ip, const char *buf,
unsigned int offset, unsigned int size)
{
struct buffer_head *dibh;
int error;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
return error;
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
memcpy(dibh->b_data + offset + sizeof(struct gfs2_inode), buf, size);
if (ip->i_di.di_size < offset + size)
ip->i_di.di_size = offset + size;
ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
gfs2_dinode_out(&ip->i_di, dibh->b_data);
brelse(dibh);
return size;
}
/**
* gfs2_dir_write_data - Write directory information to the inode
* @ip: The GFS2 inode
* @buf: The buffer containing information to be written
* @offset: The file offset to start writing at
* @size: The amount of data to write
*
* Returns: The number of bytes correctly written or error code
*/
static int gfs2_dir_write_data(struct gfs2_inode *ip, const char *buf,
uint64_t offset, unsigned int size)
{
struct gfs2_sbd *sdp = ip->i_sbd;
struct buffer_head *dibh;
uint64_t lblock, dblock;
uint32_t extlen = 0;
unsigned int o;
int copied = 0;
int error = 0;
if (!size)
return 0;
if (gfs2_is_stuffed(ip) &&
offset + size <= sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
return gfs2_dir_write_stuffed(ip, buf, (unsigned int)offset, size);
if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip)))
return -EINVAL;
if (gfs2_is_stuffed(ip)) {
error = gfs2_unstuff_dinode(ip, NULL, NULL);
if (error)
return error;
}
lblock = offset;
o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header);
while (copied < size) {
unsigned int amount;
struct buffer_head *bh;
int new;
amount = size - copied;
if (amount > sdp->sd_sb.sb_bsize - o)
amount = sdp->sd_sb.sb_bsize - o;
if (!extlen) {
new = 1;
error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen);
if (error)
goto fail;
error = -EIO;
if (gfs2_assert_withdraw(sdp, dblock))
goto fail;
}
error = gfs2_dir_get_buffer(ip, dblock, (amount == sdp->sd_jbsize) ? 1 : new, &bh);
if (error)
goto fail;
gfs2_trans_add_bh(ip->i_gl, bh, 1);
memcpy(bh->b_data + o, buf, amount);
brelse(bh);
if (error)
goto fail;
copied += amount;
lblock++;
dblock++;
extlen--;
o = sizeof(struct gfs2_meta_header);
}
out:
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
return error;
if (ip->i_di.di_size < offset + copied)
ip->i_di.di_size = offset + copied;
ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
gfs2_dinode_out(&ip->i_di, dibh->b_data);
brelse(dibh);
return copied;
fail:
if (copied)
goto out;
return error;
}
static int gfs2_dir_read_stuffed(struct gfs2_inode *ip, char *buf,
unsigned int offset, unsigned int size)
{
struct buffer_head *dibh;
int error;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (!error) {
offset += sizeof(struct gfs2_dinode);
memcpy(buf, dibh->b_data + offset, size);
brelse(dibh);
}
return (error) ? error : size;
}
/**
* gfs2_dir_read_data - Read a data from a directory inode
* @ip: The GFS2 Inode
* @buf: The buffer to place result into
* @offset: File offset to begin jdata_readng from
* @size: Amount of data to transfer
*
* Returns: The amount of data actually copied or the error
*/
static int gfs2_dir_read_data(struct gfs2_inode *ip, char *buf,
uint64_t offset, unsigned int size)
{
struct gfs2_sbd *sdp = ip->i_sbd;
uint64_t lblock, dblock;
uint32_t extlen = 0;
unsigned int o;
int copied = 0;
int error = 0;
if (offset >= ip->i_di.di_size)
return 0;
if ((offset + size) > ip->i_di.di_size)
size = ip->i_di.di_size - offset;
if (!size)
return 0;
if (gfs2_is_stuffed(ip))
return gfs2_dir_read_stuffed(ip, buf, (unsigned int)offset, size);
if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip)))
return -EINVAL;
lblock = offset;
o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header);
while (copied < size) {
unsigned int amount;
struct buffer_head *bh;
int new;
amount = size - copied;
if (amount > sdp->sd_sb.sb_bsize - o)
amount = sdp->sd_sb.sb_bsize - o;
if (!extlen) {
new = 0;
error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen);
if (error)
goto fail;
}
if (extlen > 1)
gfs2_meta_ra(ip->i_gl, dblock, extlen);
if (dblock) {
error = gfs2_dir_get_buffer(ip, dblock, new, &bh);
if (error)
goto fail;
dblock++;
extlen--;
} else
bh = NULL;
memcpy(buf, bh->b_data + o, amount);
brelse(bh);
if (error)
goto fail;
copied += amount;
lblock++;
o = sizeof(struct gfs2_meta_header);
}
return copied;
fail:
return (copied) ? copied : error;
}
/**
* 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_dir_read_data(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_dir_read_data(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_dir_write_data(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_dir_read_data(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_dir_write_data(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_dir_read_data(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_dir_read_data(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_dir_write_data(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;
}
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