diff options
Diffstat (limited to 'kernel/fs/qnx4')
| -rw-r--r-- | kernel/fs/qnx4/Kconfig | 14 | ||||
| -rw-r--r-- | kernel/fs/qnx4/Makefile | 7 | ||||
| -rw-r--r-- | kernel/fs/qnx4/README | 9 | ||||
| -rw-r--r-- | kernel/fs/qnx4/bitmap.c | 44 | ||||
| -rw-r--r-- | kernel/fs/qnx4/dir.c | 81 | ||||
| -rw-r--r-- | kernel/fs/qnx4/inode.c | 426 | ||||
| -rw-r--r-- | kernel/fs/qnx4/namei.c | 125 | ||||
| -rw-r--r-- | kernel/fs/qnx4/qnx4.h | 45 |
8 files changed, 751 insertions, 0 deletions
diff --git a/kernel/fs/qnx4/Kconfig b/kernel/fs/qnx4/Kconfig new file mode 100644 index 000000000..5f6089994 --- /dev/null +++ b/kernel/fs/qnx4/Kconfig @@ -0,0 +1,14 @@ +config QNX4FS_FS + tristate "QNX4 file system support (read only)" + depends on BLOCK + help + This is the file system used by the real-time operating systems + QNX 4 and QNX 6 (the latter is also called QNX RTP). + Further information is available at <http://www.qnx.com/>. + Say Y if you intend to mount QNX hard disks or floppies. + + To compile this file system support as a module, choose M here: the + module will be called qnx4. + + If you don't know whether you need it, then you don't need it: + answer N. diff --git a/kernel/fs/qnx4/Makefile b/kernel/fs/qnx4/Makefile new file mode 100644 index 000000000..4a283b3f8 --- /dev/null +++ b/kernel/fs/qnx4/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for the linux qnx4-filesystem routines. +# + +obj-$(CONFIG_QNX4FS_FS) += qnx4.o + +qnx4-objs := inode.o dir.o namei.o bitmap.o diff --git a/kernel/fs/qnx4/README b/kernel/fs/qnx4/README new file mode 100644 index 000000000..1f1e320d9 --- /dev/null +++ b/kernel/fs/qnx4/README @@ -0,0 +1,9 @@ + + This is a snapshot of the QNX4 filesystem for Linux. + Please send diffs and remarks to <al@alarsen.net> . + +Credits : + +Richard "Scuba" A. Frowijn <scuba@wxs.nl> +Frank "Jedi/Sector One" Denis <j@pureftpd.org> +Anders Larsen <al@alarsen.net> (Maintainer) diff --git a/kernel/fs/qnx4/bitmap.c b/kernel/fs/qnx4/bitmap.c new file mode 100644 index 000000000..76a7a697b --- /dev/null +++ b/kernel/fs/qnx4/bitmap.c @@ -0,0 +1,44 @@ +/* + * QNX4 file system, Linux implementation. + * + * Version : 0.2.1 + * + * Using parts of the xiafs filesystem. + * + * History : + * + * 28-05-1998 by Richard Frowijn : first release. + * 20-06-1998 by Frank Denis : basic optimisations. + * 25-06-1998 by Frank Denis : qnx4_is_free, qnx4_set_bitmap, qnx4_bmap . + * 28-06-1998 by Frank Denis : qnx4_free_inode (to be fixed) . + */ + +#include <linux/buffer_head.h> +#include <linux/bitops.h> +#include "qnx4.h" + +unsigned long qnx4_count_free_blocks(struct super_block *sb) +{ + int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1; + int total = 0; + int total_free = 0; + int offset = 0; + int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size); + struct buffer_head *bh; + + while (total < size) { + int bytes = min(size - total, QNX4_BLOCK_SIZE); + + if ((bh = sb_bread(sb, start + offset)) == NULL) { + printk(KERN_ERR "qnx4: I/O error in counting free blocks\n"); + break; + } + total_free += bytes * BITS_PER_BYTE - + memweight(bh->b_data, bytes); + brelse(bh); + total += bytes; + offset++; + } + + return total_free; +} diff --git a/kernel/fs/qnx4/dir.c b/kernel/fs/qnx4/dir.c new file mode 100644 index 000000000..b218f9658 --- /dev/null +++ b/kernel/fs/qnx4/dir.c @@ -0,0 +1,81 @@ +/* + * QNX4 file system, Linux implementation. + * + * Version : 0.2.1 + * + * Using parts of the xiafs filesystem. + * + * History : + * + * 28-05-1998 by Richard Frowijn : first release. + * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support. + */ + +#include <linux/buffer_head.h> +#include "qnx4.h" + +static int qnx4_readdir(struct file *file, struct dir_context *ctx) +{ + struct inode *inode = file_inode(file); + unsigned int offset; + struct buffer_head *bh; + struct qnx4_inode_entry *de; + struct qnx4_link_info *le; + unsigned long blknum; + int ix, ino; + int size; + + QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size)); + QNX4DEBUG((KERN_INFO "pos = %ld\n", (long) ctx->pos)); + + while (ctx->pos < inode->i_size) { + blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS); + bh = sb_bread(inode->i_sb, blknum); + if (bh == NULL) { + printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum); + return 0; + } + ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK; + for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) { + offset = ix * QNX4_DIR_ENTRY_SIZE; + de = (struct qnx4_inode_entry *) (bh->b_data + offset); + if (!de->di_fname[0]) + continue; + if (!(de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK))) + continue; + if (!(de->di_status & QNX4_FILE_LINK)) + size = QNX4_SHORT_NAME_MAX; + else + size = QNX4_NAME_MAX; + size = strnlen(de->di_fname, size); + QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname)); + if (!(de->di_status & QNX4_FILE_LINK)) + ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1; + else { + le = (struct qnx4_link_info*)de; + ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) * + QNX4_INODES_PER_BLOCK + + le->dl_inode_ndx; + } + if (!dir_emit(ctx, de->di_fname, size, ino, DT_UNKNOWN)) { + brelse(bh); + return 0; + } + } + brelse(bh); + } + return 0; +} + +const struct file_operations qnx4_dir_operations = +{ + .llseek = generic_file_llseek, + .read = generic_read_dir, + .iterate = qnx4_readdir, + .fsync = generic_file_fsync, +}; + +const struct inode_operations qnx4_dir_inode_operations = +{ + .lookup = qnx4_lookup, +}; diff --git a/kernel/fs/qnx4/inode.c b/kernel/fs/qnx4/inode.c new file mode 100644 index 000000000..c4bcb7788 --- /dev/null +++ b/kernel/fs/qnx4/inode.c @@ -0,0 +1,426 @@ +/* + * 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 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, + .statfs = qnx4_statfs, + .remount_fs = qnx4_remount, +}; + +static int qnx4_remount(struct super_block *sb, int *flags, char *data) +{ + struct qnx4_sb_info *qs; + + sync_filesystem(sb); + qs = qnx4_sb(sb); + qs->Version = QNX4_VERSION; + *flags |= MS_RDONLY; + return 0; +} + +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; +} + +static inline u32 try_extent(qnx4_xtnt_t *extent, u32 *offset) +{ + u32 size = le32_to_cpu(extent->xtnt_size); + if (*offset < size) + return le32_to_cpu(extent->xtnt_blk) + *offset - 1; + *offset -= size; + return 0; +} + +unsigned long qnx4_block_map( struct inode *inode, long iblock ) +{ + int ix; + long i_xblk; + 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); + u32 offset = iblock; + u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset); + + if (block) { + // iblock is in the first extent. This is easy. + } else { + // iblock is beyond first extent. We have to follow the extent chain. + i_xblk = le32_to_cpu(qnx4_inode->di_xblk); + 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; + } + } + block = try_extent(&xblk->xblk_xtnts[ix], &offset); + if (block) { + // got it! + break; + } + 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 qnx4_super_block *s) +{ + struct buffer_head *bh; + struct qnx4_inode_entry *rootdir; + int rd, rl; + int i, j; + + if (s->RootDir.di_fname[0] != '/' || s->RootDir.di_fname[1] != '\0') + return "no qnx4 filesystem (no root dir)."; + QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id)); + rd = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_blk) - 1; + rl = le32_to_cpu(s->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."; + rootdir = (struct qnx4_inode_entry *) bh->b_data; + for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) { + QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname)); + if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0) + continue; + qnx4_sb(sb)->BitMap = kmemdup(rootdir, + sizeof(struct qnx4_inode_entry), + GFP_KERNEL); + brelse(bh); + if (!qnx4_sb(sb)->BitMap) + return "not enough memory for bitmap inode"; + /* keep bitmap inode known */ + return NULL; + } + brelse(bh); + } + return "bitmap file not found."; +} + +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); + + s->s_op = &qnx4_sops; + s->s_magic = QNX4_SUPER_MAGIC; + s->s_flags |= MS_RDONLY; /* Yup, read-only yet */ + + /* 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"); + return -EINVAL; + } + + /* check before allocating dentries, inodes, .. */ + errmsg = qnx4_checkroot(s, (struct qnx4_super_block *) bh->b_data); + brelse(bh); + if (errmsg != NULL) { + if (!silent) + printk(KERN_ERR "qnx4: %s\n", errmsg); + return -EINVAL; + } + + /* 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"); + return PTR_ERR(root); + } + + s->s_root = d_make_root(root); + if (s->s_root == NULL) + return -ENOMEM; + + return 0; +} + +static void qnx4_kill_sb(struct super_block *sb) +{ + struct qnx4_sb_info *qs = qnx4_sb(sb); + kill_block_super(sb); + if (qs) { + kfree(qs->BitMap); + kfree(qs); + } +} + +static int qnx4_readpage(struct file *file, struct page *page) +{ + return block_read_full_page(page,qnx4_get_block); +} + +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, + .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); + i_uid_write(inode, (uid_t)le16_to_cpu(raw_inode->di_uid)); + i_gid_write(inode, (gid_t)le16_to_cpu(raw_inode->di_gid)); + set_nlink(inode, 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); + 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) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + 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 = qnx4_kill_sb, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("qnx4"); + +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"); + diff --git a/kernel/fs/qnx4/namei.c b/kernel/fs/qnx4/namei.c new file mode 100644 index 000000000..e62c81837 --- /dev/null +++ b/kernel/fs/qnx4/namei.c @@ -0,0 +1,125 @@ +/* + * QNX4 file system, Linux implementation. + * + * Version : 0.2.1 + * + * Using parts of the xiafs filesystem. + * + * History : + * + * 01-06-1998 by Richard Frowijn : first release. + * 21-06-1998 by Frank Denis : dcache support, fixed error codes. + * 04-07-1998 by Frank Denis : first step for rmdir/unlink. + */ + +#include <linux/buffer_head.h> +#include "qnx4.h" + + +/* + * check if the filename is correct. For some obscure reason, qnx writes a + * new file twice in the directory entry, first with all possible options at 0 + * and for a second time the way it is, they want us not to access the qnx + * filesystem when whe are using linux. + */ +static int qnx4_match(int len, const char *name, + struct buffer_head *bh, unsigned long *offset) +{ + struct qnx4_inode_entry *de; + int namelen, thislen; + + if (bh == NULL) { + printk(KERN_WARNING "qnx4: matching unassigned buffer !\n"); + return 0; + } + de = (struct qnx4_inode_entry *) (bh->b_data + *offset); + *offset += QNX4_DIR_ENTRY_SIZE; + if ((de->di_status & QNX4_FILE_LINK) != 0) { + namelen = QNX4_NAME_MAX; + } else { + namelen = QNX4_SHORT_NAME_MAX; + } + thislen = strlen( de->di_fname ); + if ( thislen > namelen ) + thislen = namelen; + if (len != thislen) { + return 0; + } + if (strncmp(name, de->di_fname, len) == 0) { + if ((de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)) != 0) { + return 1; + } + } + return 0; +} + +static struct buffer_head *qnx4_find_entry(int len, struct inode *dir, + const char *name, struct qnx4_inode_entry **res_dir, int *ino) +{ + unsigned long block, offset, blkofs; + struct buffer_head *bh; + + *res_dir = NULL; + bh = NULL; + block = offset = blkofs = 0; + while (blkofs * QNX4_BLOCK_SIZE + offset < dir->i_size) { + if (!bh) { + block = qnx4_block_map(dir, blkofs); + if (block) + bh = sb_bread(dir->i_sb, block); + if (!bh) { + blkofs++; + continue; + } + } + *res_dir = (struct qnx4_inode_entry *) (bh->b_data + offset); + if (qnx4_match(len, name, bh, &offset)) { + *ino = block * QNX4_INODES_PER_BLOCK + + (offset / QNX4_DIR_ENTRY_SIZE) - 1; + return bh; + } + if (offset < bh->b_size) { + continue; + } + brelse(bh); + bh = NULL; + offset = 0; + blkofs++; + } + brelse(bh); + *res_dir = NULL; + return NULL; +} + +struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) +{ + int ino; + struct qnx4_inode_entry *de; + struct qnx4_link_info *lnk; + struct buffer_head *bh; + const char *name = dentry->d_name.name; + int len = dentry->d_name.len; + struct inode *foundinode = NULL; + + if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino))) + goto out; + /* The entry is linked, let's get the real info */ + if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) { + lnk = (struct qnx4_link_info *) de; + ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) * + QNX4_INODES_PER_BLOCK + + lnk->dl_inode_ndx; + } + brelse(bh); + + foundinode = qnx4_iget(dir->i_sb, ino); + if (IS_ERR(foundinode)) { + QNX4DEBUG((KERN_ERR "qnx4: lookup->iget -> error %ld\n", + PTR_ERR(foundinode))); + return ERR_CAST(foundinode); + } +out: + d_add(dentry, foundinode); + + return NULL; +} diff --git a/kernel/fs/qnx4/qnx4.h b/kernel/fs/qnx4/qnx4.h new file mode 100644 index 000000000..c9b1be2c1 --- /dev/null +++ b/kernel/fs/qnx4/qnx4.h @@ -0,0 +1,45 @@ +#include <linux/fs.h> +#include <linux/qnx4_fs.h> + +#define QNX4_DEBUG 0 + +#if QNX4_DEBUG +#define QNX4DEBUG(X) printk X +#else +#define QNX4DEBUG(X) (void) 0 +#endif + +struct qnx4_sb_info { + unsigned int Version; /* may be useful */ + struct qnx4_inode_entry *BitMap; /* useful */ +}; + +struct qnx4_inode_info { + struct qnx4_inode_entry raw; + loff_t mmu_private; + struct inode vfs_inode; +}; + +extern struct inode *qnx4_iget(struct super_block *, unsigned long); +extern struct dentry *qnx4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags); +extern unsigned long qnx4_count_free_blocks(struct super_block *sb); +extern unsigned long qnx4_block_map(struct inode *inode, long iblock); + +extern const struct inode_operations qnx4_dir_inode_operations; +extern const struct file_operations qnx4_dir_operations; +extern int qnx4_is_free(struct super_block *sb, long block); + +static inline struct qnx4_sb_info *qnx4_sb(struct super_block *sb) +{ + return sb->s_fs_info; +} + +static inline struct qnx4_inode_info *qnx4_i(struct inode *inode) +{ + return container_of(inode, struct qnx4_inode_info, vfs_inode); +} + +static inline struct qnx4_inode_entry *qnx4_raw_inode(struct inode *inode) +{ + return &qnx4_i(inode)->raw; +} |