kernel-ark/fs/qnx4/inode.c
Christoph Lameter 50953fe9e0 slab allocators: Remove SLAB_DEBUG_INITIAL flag
I have never seen a use of SLAB_DEBUG_INITIAL.  It is only supported by
SLAB.

I think its purpose was to have a callback after an object has been freed
to verify that the state is the constructor state again?  The callback is
performed before each freeing of an object.

I would think that it is much easier to check the object state manually
before the free.  That also places the check near the code object
manipulation of the object.

Also the SLAB_DEBUG_INITIAL callback is only performed if the kernel was
compiled with SLAB debugging on.  If there would be code in a constructor
handling SLAB_DEBUG_INITIAL then it would have to be conditional on
SLAB_DEBUG otherwise it would just be dead code.  But there is no such code
in the kernel.  I think SLUB_DEBUG_INITIAL is too problematic to make real
use of, difficult to understand and there are easier ways to accomplish the
same effect (i.e.  add debug code before kfree).

There is a related flag SLAB_CTOR_VERIFY that is frequently checked to be
clear in fs inode caches.  Remove the pointless checks (they would even be
pointless without removeal of SLAB_DEBUG_INITIAL) from the fs constructors.

This is the last slab flag that SLUB did not support.  Remove the check for
unimplemented flags from SLUB.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-07 12:12:57 -07:00

603 lines
15 KiB
C

/*
* QNX4 file system, Linux implementation.
*
* Version : 0.2.1
*
* Using parts of the xiafs filesystem.
*
* History :
*
* 01-06-1998 by Richard Frowijn : first release.
* 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
* 30-06-1998 by Frank Denis : first step to write inodes.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/qnx4_fs.h>
#include <linux/init.h>
#include <linux/highuid.h>
#include <linux/smp_lock.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
#include <asm/uaccess.h>
#define QNX4_VERSION 4
#define QNX4_BMNAME ".bitmap"
static const struct super_operations qnx4_sops;
#ifdef CONFIG_QNX4FS_RW
int qnx4_sync_inode(struct inode *inode)
{
int err = 0;
# if 0
struct buffer_head *bh;
bh = qnx4_update_inode(inode);
if (bh && buffer_dirty(bh))
{
sync_dirty_buffer(bh);
if (buffer_req(bh) && !buffer_uptodate(bh))
{
printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
inode->i_sb->s_id, inode->i_ino);
err = -1;
}
brelse (bh);
} else if (!bh) {
err = -1;
}
# endif
return err;
}
static void qnx4_delete_inode(struct inode *inode)
{
QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
truncate_inode_pages(&inode->i_data, 0);
inode->i_size = 0;
qnx4_truncate(inode);
lock_kernel();
qnx4_free_inode(inode);
unlock_kernel();
}
static void qnx4_write_super(struct super_block *sb)
{
lock_kernel();
QNX4DEBUG(("qnx4: write_super\n"));
sb->s_dirt = 0;
unlock_kernel();
}
static int qnx4_write_inode(struct inode *inode, int unused)
{
struct qnx4_inode_entry *raw_inode;
int block, ino;
struct buffer_head *bh;
ino = inode->i_ino;
QNX4DEBUG(("qnx4: write inode 1.\n"));
if (inode->i_nlink == 0) {
return 0;
}
if (!ino) {
printk("qnx4: bad inode number on dev %s: %d is out of range\n",
inode->i_sb->s_id, ino);
return -EIO;
}
QNX4DEBUG(("qnx4: write inode 2.\n"));
block = ino / QNX4_INODES_PER_BLOCK;
lock_kernel();
if (!(bh = sb_bread(inode->i_sb, block))) {
printk("qnx4: major problem: unable to read inode from dev "
"%s\n", inode->i_sb->s_id);
unlock_kernel();
return -EIO;
}
raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
(ino % QNX4_INODES_PER_BLOCK);
raw_inode->di_mode = cpu_to_le16(inode->i_mode);
raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid));
raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid));
raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
raw_inode->di_size = cpu_to_le32(inode->i_size);
raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
mark_buffer_dirty(bh);
brelse(bh);
unlock_kernel();
return 0;
}
#endif
static void qnx4_put_super(struct super_block *sb);
static struct inode *qnx4_alloc_inode(struct super_block *sb);
static void qnx4_destroy_inode(struct inode *inode);
static void qnx4_read_inode(struct inode *);
static int qnx4_remount(struct super_block *sb, int *flags, char *data);
static int qnx4_statfs(struct dentry *, struct kstatfs *);
static const struct super_operations qnx4_sops =
{
.alloc_inode = qnx4_alloc_inode,
.destroy_inode = qnx4_destroy_inode,
.read_inode = qnx4_read_inode,
.put_super = qnx4_put_super,
.statfs = qnx4_statfs,
.remount_fs = qnx4_remount,
#ifdef CONFIG_QNX4FS_RW
.write_inode = qnx4_write_inode,
.delete_inode = qnx4_delete_inode,
.write_super = qnx4_write_super,
#endif
};
static int qnx4_remount(struct super_block *sb, int *flags, char *data)
{
struct qnx4_sb_info *qs;
qs = qnx4_sb(sb);
qs->Version = QNX4_VERSION;
#ifndef CONFIG_QNX4FS_RW
*flags |= MS_RDONLY;
#endif
if (*flags & MS_RDONLY) {
return 0;
}
mark_buffer_dirty(qs->sb_buf);
return 0;
}
static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
int create)
{
struct buffer_head *result = NULL;
if ( nr >= 0 )
nr = qnx4_block_map( inode, nr );
if (nr) {
result = sb_getblk(inode->i_sb, nr);
return result;
}
if (!create) {
return NULL;
}
#if 0
tmp = qnx4_new_block(inode->i_sb);
if (!tmp) {
return NULL;
}
result = sb_getblk(inode->i_sb, tmp);
if (tst) {
qnx4_free_block(inode->i_sb, tmp);
brelse(result);
goto repeat;
}
tst = tmp;
#endif
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
return result;
}
struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
{
struct buffer_head *bh;
bh = qnx4_getblk(inode, block, create);
if (!bh || buffer_uptodate(bh)) {
return bh;
}
ll_rw_block(READ, 1, &bh);
wait_on_buffer(bh);
if (buffer_uptodate(bh)) {
return bh;
}
brelse(bh);
return NULL;
}
static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
{
unsigned long phys;
QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
phys = qnx4_block_map( inode, iblock );
if ( phys ) {
// logical block is before EOF
map_bh(bh, inode->i_sb, phys);
} else if ( create ) {
// to be done.
}
return 0;
}
unsigned long qnx4_block_map( struct inode *inode, long iblock )
{
int ix;
long offset, i_xblk;
unsigned long block = 0;
struct buffer_head *bh = NULL;
struct qnx4_xblk *xblk = NULL;
struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
// iblock is in the first extent. This is easy.
block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
} else {
// iblock is beyond first extent. We have to follow the extent chain.
i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
ix = 0;
while ( --nxtnt > 0 ) {
if ( ix == 0 ) {
// read next xtnt block.
bh = sb_bread(inode->i_sb, i_xblk - 1);
if ( !bh ) {
QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
return -EIO;
}
xblk = (struct qnx4_xblk*)bh->b_data;
if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
return -EIO;
}
}
if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
// got it!
block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
break;
}
offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
if ( ++ix >= xblk->xblk_num_xtnts ) {
i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
ix = 0;
brelse( bh );
bh = NULL;
}
}
if ( bh )
brelse( bh );
}
QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
return block;
}
static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
lock_kernel();
buf->f_type = sb->s_magic;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
buf->f_bfree = qnx4_count_free_blocks(sb);
buf->f_bavail = buf->f_bfree;
buf->f_namelen = QNX4_NAME_MAX;
unlock_kernel();
return 0;
}
/*
* Check the root directory of the filesystem to make sure
* it really _is_ a qnx4 filesystem, and to check the size
* of the directory entry.
*/
static const char *qnx4_checkroot(struct super_block *sb)
{
struct buffer_head *bh;
struct qnx4_inode_entry *rootdir;
int rd, rl;
int i, j;
int found = 0;
if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
return "no qnx4 filesystem (no root dir).";
} else {
QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
for (j = 0; j < rl; j++) {
bh = sb_bread(sb, rd + j); /* root dir, first block */
if (bh == NULL) {
return "unable to read root entry.";
}
for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
if (rootdir->di_fname != NULL) {
QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
found = 1;
qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
if (!qnx4_sb(sb)->BitMap) {
brelse (bh);
return "not enough memory for bitmap inode";
}
memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
break;
}
}
}
brelse(bh);
if (found != 0) {
break;
}
}
if (found == 0) {
return "bitmap file not found.";
}
}
return NULL;
}
static int qnx4_fill_super(struct super_block *s, void *data, int silent)
{
struct buffer_head *bh;
struct inode *root;
const char *errmsg;
struct qnx4_sb_info *qs;
qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
if (!qs)
return -ENOMEM;
s->s_fs_info = qs;
sb_set_blocksize(s, QNX4_BLOCK_SIZE);
/* Check the superblock signature. Since the qnx4 code is
dangerous, we should leave as quickly as possible
if we don't belong here... */
bh = sb_bread(s, 1);
if (!bh) {
printk("qnx4: unable to read the superblock\n");
goto outnobh;
}
if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
if (!silent)
printk("qnx4: wrong fsid in superblock.\n");
goto out;
}
s->s_op = &qnx4_sops;
s->s_magic = QNX4_SUPER_MAGIC;
#ifndef CONFIG_QNX4FS_RW
s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
#endif
qnx4_sb(s)->sb_buf = bh;
qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
/* check before allocating dentries, inodes, .. */
errmsg = qnx4_checkroot(s);
if (errmsg != NULL) {
if (!silent)
printk("qnx4: %s\n", errmsg);
goto out;
}
/* does root not have inode number QNX4_ROOT_INO ?? */
root = iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
if (!root) {
printk("qnx4: get inode failed\n");
goto out;
}
s->s_root = d_alloc_root(root);
if (s->s_root == NULL)
goto outi;
brelse(bh);
return 0;
outi:
iput(root);
out:
brelse(bh);
outnobh:
kfree(qs);
s->s_fs_info = NULL;
return -EINVAL;
}
static void qnx4_put_super(struct super_block *sb)
{
struct qnx4_sb_info *qs = qnx4_sb(sb);
kfree( qs->BitMap );
kfree( qs );
sb->s_fs_info = NULL;
return;
}
static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
{
return block_write_full_page(page,qnx4_get_block, wbc);
}
static int qnx4_readpage(struct file *file, struct page *page)
{
return block_read_full_page(page,qnx4_get_block);
}
static int qnx4_prepare_write(struct file *file, struct page *page,
unsigned from, unsigned to)
{
struct qnx4_inode_info *qnx4_inode = qnx4_i(page->mapping->host);
return cont_prepare_write(page, from, to, qnx4_get_block,
&qnx4_inode->mmu_private);
}
static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
{
return generic_block_bmap(mapping,block,qnx4_get_block);
}
static const struct address_space_operations qnx4_aops = {
.readpage = qnx4_readpage,
.writepage = qnx4_writepage,
.sync_page = block_sync_page,
.prepare_write = qnx4_prepare_write,
.commit_write = generic_commit_write,
.bmap = qnx4_bmap
};
static void qnx4_read_inode(struct inode *inode)
{
struct buffer_head *bh;
struct qnx4_inode_entry *raw_inode;
int block, ino;
struct super_block *sb = inode->i_sb;
struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
ino = inode->i_ino;
inode->i_mode = 0;
QNX4DEBUG(("Reading inode : [%d]\n", ino));
if (!ino) {
printk("qnx4: bad inode number on dev %s: %d is out of range\n",
sb->s_id, ino);
return;
}
block = ino / QNX4_INODES_PER_BLOCK;
if (!(bh = sb_bread(sb, block))) {
printk("qnx4: major problem: unable to read inode from dev "
"%s\n", sb->s_id);
return;
}
raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
(ino % QNX4_INODES_PER_BLOCK);
inode->i_mode = le16_to_cpu(raw_inode->di_mode);
inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
inode->i_size = le32_to_cpu(raw_inode->di_size);
inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
inode->i_mtime.tv_nsec = 0;
inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
inode->i_atime.tv_nsec = 0;
inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
inode->i_ctime.tv_nsec = 0;
inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
if (S_ISREG(inode->i_mode)) {
inode->i_op = &qnx4_file_inode_operations;
inode->i_fop = &qnx4_file_operations;
inode->i_mapping->a_ops = &qnx4_aops;
qnx4_i(inode)->mmu_private = inode->i_size;
} else if (S_ISDIR(inode->i_mode)) {
inode->i_op = &qnx4_dir_inode_operations;
inode->i_fop = &qnx4_dir_operations;
} else if (S_ISLNK(inode->i_mode)) {
inode->i_op = &page_symlink_inode_operations;
inode->i_mapping->a_ops = &qnx4_aops;
qnx4_i(inode)->mmu_private = inode->i_size;
} else
printk("qnx4: bad inode %d on dev %s\n",ino,sb->s_id);
brelse(bh);
}
static struct kmem_cache *qnx4_inode_cachep;
static struct inode *qnx4_alloc_inode(struct super_block *sb)
{
struct qnx4_inode_info *ei;
ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
return &ei->vfs_inode;
}
static void qnx4_destroy_inode(struct inode *inode)
{
kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
}
static void init_once(void *foo, struct kmem_cache * cachep,
unsigned long flags)
{
struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
if (flags & SLAB_CTOR_CONSTRUCTOR)
inode_init_once(&ei->vfs_inode);
}
static int init_inodecache(void)
{
qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
sizeof(struct qnx4_inode_info),
0, (SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD),
init_once, NULL);
if (qnx4_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static void destroy_inodecache(void)
{
kmem_cache_destroy(qnx4_inode_cachep);
}
static int qnx4_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super,
mnt);
}
static struct file_system_type qnx4_fs_type = {
.owner = THIS_MODULE,
.name = "qnx4",
.get_sb = qnx4_get_sb,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
static int __init init_qnx4_fs(void)
{
int err;
err = init_inodecache();
if (err)
return err;
err = register_filesystem(&qnx4_fs_type);
if (err) {
destroy_inodecache();
return err;
}
printk("QNX4 filesystem 0.2.3 registered.\n");
return 0;
}
static void __exit exit_qnx4_fs(void)
{
unregister_filesystem(&qnx4_fs_type);
destroy_inodecache();
}
module_init(init_qnx4_fs)
module_exit(exit_qnx4_fs)
MODULE_LICENSE("GPL");