mirror of
https://github.com/torvalds/linux.git
synced 2024-11-30 08:01:59 +00:00
7eaceaccab
Code has been converted over to the new explicit on-stack plugging, and delay users have been converted to use the new API for that. So lets kill off the old plugging along with aops->sync_page(). Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
505 lines
13 KiB
C
505 lines
13 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/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/highuid.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/statfs.h>
|
|
#include "qnx4.h"
|
|
|
|
#define QNX4_VERSION 4
|
|
#define QNX4_BMNAME ".bitmap"
|
|
|
|
static const struct super_operations qnx4_sops;
|
|
|
|
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 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,
|
|
.put_super = qnx4_put_super,
|
|
.statfs = qnx4_statfs,
|
|
.remount_fs = qnx4_remount,
|
|
};
|
|
|
|
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;
|
|
*flags |= MS_RDONLY;
|
|
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;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
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((KERN_INFO "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);
|
|
}
|
|
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((KERN_ERR "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((KERN_ERR "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((KERN_INFO "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;
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
|
|
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;
|
|
buf->f_fsid.val[0] = (u32)id;
|
|
buf->f_fsid.val[1] = (u32)(id >> 32);
|
|
|
|
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((KERN_NOTICE "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((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
|
|
if (!strcmp(rootdir->di_fname,
|
|
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;
|
|
int ret = -EINVAL;
|
|
|
|
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(KERN_ERR "qnx4: unable to read the superblock\n");
|
|
goto outnobh;
|
|
}
|
|
if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
|
|
if (!silent)
|
|
printk(KERN_ERR "qnx4: wrong fsid in superblock.\n");
|
|
goto out;
|
|
}
|
|
s->s_op = &qnx4_sops;
|
|
s->s_magic = QNX4_SUPER_MAGIC;
|
|
s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
|
|
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(KERN_ERR "qnx4: %s\n", errmsg);
|
|
goto out;
|
|
}
|
|
|
|
/* does root not have inode number QNX4_ROOT_INO ?? */
|
|
root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
|
|
if (IS_ERR(root)) {
|
|
printk(KERN_ERR "qnx4: get inode failed\n");
|
|
ret = PTR_ERR(root);
|
|
goto out;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
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 ret;
|
|
}
|
|
|
|
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_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
|
|
int ret;
|
|
|
|
*pagep = NULL;
|
|
ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
|
|
qnx4_get_block,
|
|
&qnx4_inode->mmu_private);
|
|
if (unlikely(ret)) {
|
|
loff_t isize = mapping->host->i_size;
|
|
if (pos + len > isize)
|
|
vmtruncate(mapping->host, isize);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
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,
|
|
.write_begin = qnx4_write_begin,
|
|
.write_end = generic_write_end,
|
|
.bmap = qnx4_bmap
|
|
};
|
|
|
|
struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct qnx4_inode_entry *raw_inode;
|
|
int block;
|
|
struct qnx4_inode_entry *qnx4_inode;
|
|
struct inode *inode;
|
|
|
|
inode = iget_locked(sb, ino);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (!(inode->i_state & I_NEW))
|
|
return inode;
|
|
|
|
qnx4_inode = qnx4_raw_inode(inode);
|
|
inode->i_mode = 0;
|
|
|
|
QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
|
|
if (!ino) {
|
|
printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
|
|
"out of range\n",
|
|
sb->s_id, ino);
|
|
iget_failed(inode);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
block = ino / QNX4_INODES_PER_BLOCK;
|
|
|
|
if (!(bh = sb_bread(sb, block))) {
|
|
printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
|
|
"%s\n", sb->s_id);
|
|
iget_failed(inode);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
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_fop = &generic_ro_fops;
|
|
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(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
|
|
ino, sb->s_id);
|
|
iget_failed(inode);
|
|
brelse(bh);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
brelse(bh);
|
|
unlock_new_inode(inode);
|
|
return inode;
|
|
}
|
|
|
|
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_i_callback(struct rcu_head *head)
|
|
{
|
|
struct inode *inode = container_of(head, struct inode, i_rcu);
|
|
INIT_LIST_HEAD(&inode->i_dentry);
|
|
kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
|
|
}
|
|
|
|
static void qnx4_destroy_inode(struct inode *inode)
|
|
{
|
|
call_rcu(&inode->i_rcu, qnx4_i_callback);
|
|
}
|
|
|
|
static void init_once(void *foo)
|
|
{
|
|
struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
|
|
|
|
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);
|
|
if (qnx4_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_inodecache(void)
|
|
{
|
|
kmem_cache_destroy(qnx4_inode_cachep);
|
|
}
|
|
|
|
static struct dentry *qnx4_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
|
|
}
|
|
|
|
static struct file_system_type qnx4_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "qnx4",
|
|
.mount = qnx4_mount,
|
|
.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(KERN_INFO "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");
|
|
|