diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/qnx4/inode.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/qnx4/inode.c')
-rw-r--r-- | fs/qnx4/inode.c | 603 |
1 files changed, 603 insertions, 0 deletions
diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c new file mode 100644 index 000000000000..aa92d6b76a9a --- /dev/null +++ b/fs/qnx4/inode.c @@ -0,0 +1,603 @@ +/* + * 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/config.h> +#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 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)); + 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 super_block *, struct kstatfs *); + +static 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); + qnx4_nxtnt_t 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 super_block *sb, struct kstatfs *buf) +{ + 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 = kmalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL); + if (!qs) + return -ENOMEM; + s->s_fs_info = qs; + memset(qs, 0, sizeof(struct qnx4_sb_info)); + + 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_cpu( *(__u32*)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 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); + inode->i_blksize = QNX4_DIR_ENTRY_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 kmem_cache_t *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, SLAB_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, kmem_cache_t * cachep, + unsigned long flags) +{ + struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo; + + if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) == + 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, + init_once, NULL); + if (qnx4_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + if (kmem_cache_destroy(qnx4_inode_cachep)) + printk(KERN_INFO + "qnx4_inode_cache: not all structures were freed\n"); +} + +static struct super_block *qnx4_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super); +} + +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"); + |