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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/bfs/inode.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-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/bfs/inode.c')
-rw-r--r-- | fs/bfs/inode.c | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c new file mode 100644 index 000000000000..64e0fb33fc0c --- /dev/null +++ b/fs/bfs/inode.c @@ -0,0 +1,420 @@ +/* + * fs/bfs/inode.c + * BFS superblock and inode operations. + * Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com> + * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. + */ + +#include <linux/module.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/smp_lock.h> +#include <linux/buffer_head.h> +#include <linux/vfs.h> +#include <asm/uaccess.h> +#include "bfs.h" + +MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>"); +MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux"); +MODULE_LICENSE("GPL"); + +#undef DEBUG + +#ifdef DEBUG +#define dprintf(x...) printf(x) +#else +#define dprintf(x...) +#endif + +void dump_imap(const char *prefix, struct super_block * s); + +static void bfs_read_inode(struct inode * inode) +{ + unsigned long ino = inode->i_ino; + struct bfs_inode * di; + struct buffer_head * bh; + int block, off; + + if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) { + printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); + make_bad_inode(inode); + return; + } + + block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; + bh = sb_bread(inode->i_sb, block); + if (!bh) { + printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino); + make_bad_inode(inode); + return; + } + + off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; + di = (struct bfs_inode *)bh->b_data + off; + + inode->i_mode = 0x0000FFFF & di->i_mode; + if (di->i_vtype == BFS_VDIR) { + inode->i_mode |= S_IFDIR; + inode->i_op = &bfs_dir_inops; + inode->i_fop = &bfs_dir_operations; + } else if (di->i_vtype == BFS_VREG) { + inode->i_mode |= S_IFREG; + inode->i_op = &bfs_file_inops; + inode->i_fop = &bfs_file_operations; + inode->i_mapping->a_ops = &bfs_aops; + } + + inode->i_uid = di->i_uid; + inode->i_gid = di->i_gid; + inode->i_nlink = di->i_nlink; + inode->i_size = BFS_FILESIZE(di); + inode->i_blocks = BFS_FILEBLOCKS(di); + inode->i_blksize = PAGE_SIZE; + inode->i_atime.tv_sec = di->i_atime; + inode->i_mtime.tv_sec = di->i_mtime; + inode->i_ctime.tv_sec = di->i_ctime; + inode->i_atime.tv_nsec = 0; + inode->i_mtime.tv_nsec = 0; + inode->i_ctime.tv_nsec = 0; + BFS_I(inode)->i_dsk_ino = di->i_ino; /* can be 0 so we store a copy */ + BFS_I(inode)->i_sblock = di->i_sblock; + BFS_I(inode)->i_eblock = di->i_eblock; + + brelse(bh); +} + +static int bfs_write_inode(struct inode * inode, int unused) +{ + unsigned long ino = inode->i_ino; + struct bfs_inode * di; + struct buffer_head * bh; + int block, off; + + if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) { + printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); + return -EIO; + } + + lock_kernel(); + block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; + bh = sb_bread(inode->i_sb, block); + if (!bh) { + printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino); + unlock_kernel(); + return -EIO; + } + + off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; + di = (struct bfs_inode *)bh->b_data + off; + + if (inode->i_ino == BFS_ROOT_INO) + di->i_vtype = BFS_VDIR; + else + di->i_vtype = BFS_VREG; + + di->i_ino = inode->i_ino; + di->i_mode = inode->i_mode; + di->i_uid = inode->i_uid; + di->i_gid = inode->i_gid; + di->i_nlink = inode->i_nlink; + di->i_atime = inode->i_atime.tv_sec; + di->i_mtime = inode->i_mtime.tv_sec; + di->i_ctime = inode->i_ctime.tv_sec; + di->i_sblock = BFS_I(inode)->i_sblock; + di->i_eblock = BFS_I(inode)->i_eblock; + di->i_eoffset = di->i_sblock * BFS_BSIZE + inode->i_size - 1; + + mark_buffer_dirty(bh); + brelse(bh); + unlock_kernel(); + return 0; +} + +static void bfs_delete_inode(struct inode * inode) +{ + unsigned long ino = inode->i_ino; + struct bfs_inode * di; + struct buffer_head * bh; + int block, off; + struct super_block * s = inode->i_sb; + struct bfs_sb_info * info = BFS_SB(s); + + dprintf("ino=%08lx\n", inode->i_ino); + + if (inode->i_ino < BFS_ROOT_INO || inode->i_ino > info->si_lasti) { + printf("invalid ino=%08lx\n", inode->i_ino); + return; + } + + inode->i_size = 0; + inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; + lock_kernel(); + mark_inode_dirty(inode); + block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; + bh = sb_bread(s, block); + if (!bh) { + printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino); + unlock_kernel(); + return; + } + off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; + di = (struct bfs_inode *)bh->b_data + off; + if (di->i_ino) { + info->si_freeb += BFS_FILEBLOCKS(di); + info->si_freei++; + clear_bit(di->i_ino, info->si_imap); + dump_imap("delete_inode", s); + } + di->i_ino = 0; + di->i_sblock = 0; + mark_buffer_dirty(bh); + brelse(bh); + + /* if this was the last file, make the previous + block "last files last block" even if there is no real file there, + saves us 1 gap */ + if (info->si_lf_eblk == BFS_I(inode)->i_eblock) { + info->si_lf_eblk = BFS_I(inode)->i_sblock - 1; + mark_buffer_dirty(info->si_sbh); + } + unlock_kernel(); + clear_inode(inode); +} + +static void bfs_put_super(struct super_block *s) +{ + struct bfs_sb_info *info = BFS_SB(s); + brelse(info->si_sbh); + kfree(info->si_imap); + kfree(info); + s->s_fs_info = NULL; +} + +static int bfs_statfs(struct super_block *s, struct kstatfs *buf) +{ + struct bfs_sb_info *info = BFS_SB(s); + u64 id = huge_encode_dev(s->s_bdev->bd_dev); + buf->f_type = BFS_MAGIC; + buf->f_bsize = s->s_blocksize; + buf->f_blocks = info->si_blocks; + buf->f_bfree = buf->f_bavail = info->si_freeb; + buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; + buf->f_ffree = info->si_freei; + buf->f_fsid.val[0] = (u32)id; + buf->f_fsid.val[1] = (u32)(id >> 32); + buf->f_namelen = BFS_NAMELEN; + return 0; +} + +static void bfs_write_super(struct super_block *s) +{ + lock_kernel(); + if (!(s->s_flags & MS_RDONLY)) + mark_buffer_dirty(BFS_SB(s)->si_sbh); + s->s_dirt = 0; + unlock_kernel(); +} + +static kmem_cache_t * bfs_inode_cachep; + +static struct inode *bfs_alloc_inode(struct super_block *sb) +{ + struct bfs_inode_info *bi; + bi = kmem_cache_alloc(bfs_inode_cachep, SLAB_KERNEL); + if (!bi) + return NULL; + return &bi->vfs_inode; +} + +static void bfs_destroy_inode(struct inode *inode) +{ + kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); +} + +static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) +{ + struct bfs_inode_info *bi = foo; + + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == + SLAB_CTOR_CONSTRUCTOR) + inode_init_once(&bi->vfs_inode); +} + +static int init_inodecache(void) +{ + bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", + sizeof(struct bfs_inode_info), + 0, SLAB_RECLAIM_ACCOUNT, + init_once, NULL); + if (bfs_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + if (kmem_cache_destroy(bfs_inode_cachep)) + printk(KERN_INFO "bfs_inode_cache: not all structures were freed\n"); +} + +static struct super_operations bfs_sops = { + .alloc_inode = bfs_alloc_inode, + .destroy_inode = bfs_destroy_inode, + .read_inode = bfs_read_inode, + .write_inode = bfs_write_inode, + .delete_inode = bfs_delete_inode, + .put_super = bfs_put_super, + .write_super = bfs_write_super, + .statfs = bfs_statfs, +}; + +void dump_imap(const char *prefix, struct super_block * s) +{ +#if 0 + int i; + char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); + + if (!tmpbuf) + return; + for (i=BFS_SB(s)->si_lasti; i>=0; i--) { + if (i>PAGE_SIZE-100) break; + if (test_bit(i, BFS_SB(s)->si_imap)) + strcat(tmpbuf, "1"); + else + strcat(tmpbuf, "0"); + } + printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf); + free_page((unsigned long)tmpbuf); +#endif +} + +static int bfs_fill_super(struct super_block *s, void *data, int silent) +{ + struct buffer_head * bh; + struct bfs_super_block * bfs_sb; + struct inode * inode; + int i, imap_len; + struct bfs_sb_info * info; + + info = kmalloc(sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + s->s_fs_info = info; + memset(info, 0, sizeof(*info)); + + sb_set_blocksize(s, BFS_BSIZE); + + bh = sb_bread(s, 0); + if(!bh) + goto out; + bfs_sb = (struct bfs_super_block *)bh->b_data; + if (bfs_sb->s_magic != BFS_MAGIC) { + if (!silent) + printf("No BFS filesystem on %s (magic=%08x)\n", + s->s_id, bfs_sb->s_magic); + goto out; + } + if (BFS_UNCLEAN(bfs_sb, s) && !silent) + printf("%s is unclean, continuing\n", s->s_id); + + s->s_magic = BFS_MAGIC; + info->si_bfs_sb = bfs_sb; + info->si_sbh = bh; + info->si_lasti = (bfs_sb->s_start - BFS_BSIZE)/sizeof(struct bfs_inode) + + BFS_ROOT_INO - 1; + + imap_len = info->si_lasti/8 + 1; + info->si_imap = kmalloc(imap_len, GFP_KERNEL); + if (!info->si_imap) + goto out; + memset(info->si_imap, 0, imap_len); + for (i=0; i<BFS_ROOT_INO; i++) + set_bit(i, info->si_imap); + + s->s_op = &bfs_sops; + inode = iget(s, BFS_ROOT_INO); + if (!inode) { + kfree(info->si_imap); + goto out; + } + s->s_root = d_alloc_root(inode); + if (!s->s_root) { + iput(inode); + kfree(info->si_imap); + goto out; + } + + info->si_blocks = (bfs_sb->s_end + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */ + info->si_freeb = (bfs_sb->s_end + 1 - bfs_sb->s_start)>>BFS_BSIZE_BITS; + info->si_freei = 0; + info->si_lf_eblk = 0; + info->si_lf_sblk = 0; + info->si_lf_ioff = 0; + for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) { + inode = iget(s,i); + if (BFS_I(inode)->i_dsk_ino == 0) + info->si_freei++; + else { + set_bit(i, info->si_imap); + info->si_freeb -= inode->i_blocks; + if (BFS_I(inode)->i_eblock > info->si_lf_eblk) { + info->si_lf_eblk = BFS_I(inode)->i_eblock; + info->si_lf_sblk = BFS_I(inode)->i_sblock; + info->si_lf_ioff = BFS_INO2OFF(i); + } + } + iput(inode); + } + if (!(s->s_flags & MS_RDONLY)) { + mark_buffer_dirty(bh); + s->s_dirt = 1; + } + dump_imap("read_super", s); + return 0; + +out: + brelse(bh); + kfree(info); + s->s_fs_info = NULL; + return -EINVAL; +} + +static struct super_block *bfs_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, bfs_fill_super); +} + +static struct file_system_type bfs_fs_type = { + .owner = THIS_MODULE, + .name = "bfs", + .get_sb = bfs_get_sb, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; + +static int __init init_bfs_fs(void) +{ + int err = init_inodecache(); + if (err) + goto out1; + err = register_filesystem(&bfs_fs_type); + if (err) + goto out; + return 0; +out: + destroy_inodecache(); +out1: + return err; +} + +static void __exit exit_bfs_fs(void) +{ + unregister_filesystem(&bfs_fs_type); + destroy_inodecache(); +} + +module_init(init_bfs_fs) +module_exit(exit_bfs_fs) |