| /* |
| * linux/fs/sysv/inode.c |
| * |
| * minix/inode.c |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * |
| * xenix/inode.c |
| * Copyright (C) 1992 Doug Evans |
| * |
| * coh/inode.c |
| * Copyright (C) 1993 Pascal Haible, Bruno Haible |
| * |
| * sysv/inode.c |
| * Copyright (C) 1993 Paul B. Monday |
| * |
| * sysv/inode.c |
| * Copyright (C) 1993 Bruno Haible |
| * Copyright (C) 1997, 1998 Krzysztof G. Baranowski |
| * |
| * This file contains code for allocating/freeing inodes and for read/writing |
| * the superblock. |
| */ |
| |
| #include <linux/highuid.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/buffer_head.h> |
| #include <linux/vfs.h> |
| #include <linux/writeback.h> |
| #include <linux/namei.h> |
| #include <asm/byteorder.h> |
| #include "sysv.h" |
| |
| static int sysv_sync_fs(struct super_block *sb, int wait) |
| { |
| struct sysv_sb_info *sbi = SYSV_SB(sb); |
| unsigned long time = get_seconds(), old_time; |
| |
| mutex_lock(&sbi->s_lock); |
| |
| /* |
| * If we are going to write out the super block, |
| * then attach current time stamp. |
| * But if the filesystem was marked clean, keep it clean. |
| */ |
| old_time = fs32_to_cpu(sbi, *sbi->s_sb_time); |
| if (sbi->s_type == FSTYPE_SYSV4) { |
| if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time)) |
| *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time); |
| *sbi->s_sb_time = cpu_to_fs32(sbi, time); |
| mark_buffer_dirty(sbi->s_bh2); |
| } |
| |
| mutex_unlock(&sbi->s_lock); |
| |
| return 0; |
| } |
| |
| static int sysv_remount(struct super_block *sb, int *flags, char *data) |
| { |
| struct sysv_sb_info *sbi = SYSV_SB(sb); |
| |
| sync_filesystem(sb); |
| if (sbi->s_forced_ro) |
| *flags |= MS_RDONLY; |
| return 0; |
| } |
| |
| static void sysv_put_super(struct super_block *sb) |
| { |
| struct sysv_sb_info *sbi = SYSV_SB(sb); |
| |
| if (!(sb->s_flags & MS_RDONLY)) { |
| /* XXX ext2 also updates the state here */ |
| mark_buffer_dirty(sbi->s_bh1); |
| if (sbi->s_bh1 != sbi->s_bh2) |
| mark_buffer_dirty(sbi->s_bh2); |
| } |
| |
| brelse(sbi->s_bh1); |
| if (sbi->s_bh1 != sbi->s_bh2) |
| brelse(sbi->s_bh2); |
| |
| kfree(sbi); |
| } |
| |
| static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| struct super_block *sb = dentry->d_sb; |
| struct sysv_sb_info *sbi = SYSV_SB(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 = sbi->s_ndatazones; |
| buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb); |
| buf->f_files = sbi->s_ninodes; |
| buf->f_ffree = sysv_count_free_inodes(sb); |
| buf->f_namelen = SYSV_NAMELEN; |
| buf->f_fsid.val[0] = (u32)id; |
| buf->f_fsid.val[1] = (u32)(id >> 32); |
| return 0; |
| } |
| |
| /* |
| * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32 |
| */ |
| static inline void read3byte(struct sysv_sb_info *sbi, |
| unsigned char * from, unsigned char * to) |
| { |
| if (sbi->s_bytesex == BYTESEX_PDP) { |
| to[0] = from[0]; |
| to[1] = 0; |
| to[2] = from[1]; |
| to[3] = from[2]; |
| } else if (sbi->s_bytesex == BYTESEX_LE) { |
| to[0] = from[0]; |
| to[1] = from[1]; |
| to[2] = from[2]; |
| to[3] = 0; |
| } else { |
| to[0] = 0; |
| to[1] = from[0]; |
| to[2] = from[1]; |
| to[3] = from[2]; |
| } |
| } |
| |
| static inline void write3byte(struct sysv_sb_info *sbi, |
| unsigned char * from, unsigned char * to) |
| { |
| if (sbi->s_bytesex == BYTESEX_PDP) { |
| to[0] = from[0]; |
| to[1] = from[2]; |
| to[2] = from[3]; |
| } else if (sbi->s_bytesex == BYTESEX_LE) { |
| to[0] = from[0]; |
| to[1] = from[1]; |
| to[2] = from[2]; |
| } else { |
| to[0] = from[1]; |
| to[1] = from[2]; |
| to[2] = from[3]; |
| } |
| } |
| |
| static const struct inode_operations sysv_symlink_inode_operations = { |
| .readlink = generic_readlink, |
| .follow_link = page_follow_link_light, |
| .put_link = page_put_link, |
| .getattr = sysv_getattr, |
| }; |
| |
| void sysv_set_inode(struct inode *inode, dev_t rdev) |
| { |
| if (S_ISREG(inode->i_mode)) { |
| inode->i_op = &sysv_file_inode_operations; |
| inode->i_fop = &sysv_file_operations; |
| inode->i_mapping->a_ops = &sysv_aops; |
| } else if (S_ISDIR(inode->i_mode)) { |
| inode->i_op = &sysv_dir_inode_operations; |
| inode->i_fop = &sysv_dir_operations; |
| inode->i_mapping->a_ops = &sysv_aops; |
| } else if (S_ISLNK(inode->i_mode)) { |
| inode->i_op = &sysv_symlink_inode_operations; |
| inode->i_mapping->a_ops = &sysv_aops; |
| } else |
| init_special_inode(inode, inode->i_mode, rdev); |
| } |
| |
| struct inode *sysv_iget(struct super_block *sb, unsigned int ino) |
| { |
| struct sysv_sb_info * sbi = SYSV_SB(sb); |
| struct buffer_head * bh; |
| struct sysv_inode * raw_inode; |
| struct sysv_inode_info * si; |
| struct inode *inode; |
| unsigned int block; |
| |
| if (!ino || ino > sbi->s_ninodes) { |
| printk("Bad inode number on dev %s: %d is out of range\n", |
| sb->s_id, ino); |
| return ERR_PTR(-EIO); |
| } |
| |
| inode = iget_locked(sb, ino); |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| if (!(inode->i_state & I_NEW)) |
| return inode; |
| |
| raw_inode = sysv_raw_inode(sb, ino, &bh); |
| if (!raw_inode) { |
| printk("Major problem: unable to read inode from dev %s\n", |
| inode->i_sb->s_id); |
| goto bad_inode; |
| } |
| /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */ |
| inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode); |
| i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid)); |
| i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid)); |
| set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink)); |
| inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size); |
| inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime); |
| inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime); |
| inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime); |
| inode->i_ctime.tv_nsec = 0; |
| inode->i_atime.tv_nsec = 0; |
| inode->i_mtime.tv_nsec = 0; |
| inode->i_blocks = 0; |
| |
| si = SYSV_I(inode); |
| for (block = 0; block < 10+1+1+1; block++) |
| read3byte(sbi, &raw_inode->i_data[3*block], |
| (u8 *)&si->i_data[block]); |
| brelse(bh); |
| si->i_dir_start_lookup = 0; |
| if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| sysv_set_inode(inode, |
| old_decode_dev(fs32_to_cpu(sbi, si->i_data[0]))); |
| else |
| sysv_set_inode(inode, 0); |
| unlock_new_inode(inode); |
| return inode; |
| |
| bad_inode: |
| iget_failed(inode); |
| return ERR_PTR(-EIO); |
| } |
| |
| static int __sysv_write_inode(struct inode *inode, int wait) |
| { |
| struct super_block * sb = inode->i_sb; |
| struct sysv_sb_info * sbi = SYSV_SB(sb); |
| struct buffer_head * bh; |
| struct sysv_inode * raw_inode; |
| struct sysv_inode_info * si; |
| unsigned int ino, block; |
| int err = 0; |
| |
| ino = inode->i_ino; |
| if (!ino || ino > sbi->s_ninodes) { |
| printk("Bad inode number on dev %s: %d is out of range\n", |
| inode->i_sb->s_id, ino); |
| return -EIO; |
| } |
| raw_inode = sysv_raw_inode(sb, ino, &bh); |
| if (!raw_inode) { |
| printk("unable to read i-node block\n"); |
| return -EIO; |
| } |
| |
| raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode); |
| raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode))); |
| raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode))); |
| raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink); |
| raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size); |
| raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec); |
| raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec); |
| raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec); |
| |
| si = SYSV_I(inode); |
| if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev)); |
| for (block = 0; block < 10+1+1+1; block++) |
| write3byte(sbi, (u8 *)&si->i_data[block], |
| &raw_inode->i_data[3*block]); |
| mark_buffer_dirty(bh); |
| if (wait) { |
| sync_dirty_buffer(bh); |
| if (buffer_req(bh) && !buffer_uptodate(bh)) { |
| printk ("IO error syncing sysv inode [%s:%08x]\n", |
| sb->s_id, ino); |
| err = -EIO; |
| } |
| } |
| brelse(bh); |
| return 0; |
| } |
| |
| int sysv_write_inode(struct inode *inode, struct writeback_control *wbc) |
| { |
| return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
| } |
| |
| int sysv_sync_inode(struct inode *inode) |
| { |
| return __sysv_write_inode(inode, 1); |
| } |
| |
| static void sysv_evict_inode(struct inode *inode) |
| { |
| truncate_inode_pages_final(&inode->i_data); |
| if (!inode->i_nlink) { |
| inode->i_size = 0; |
| sysv_truncate(inode); |
| } |
| invalidate_inode_buffers(inode); |
| clear_inode(inode); |
| if (!inode->i_nlink) |
| sysv_free_inode(inode); |
| } |
| |
| static struct kmem_cache *sysv_inode_cachep; |
| |
| static struct inode *sysv_alloc_inode(struct super_block *sb) |
| { |
| struct sysv_inode_info *si; |
| |
| si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL); |
| if (!si) |
| return NULL; |
| return &si->vfs_inode; |
| } |
| |
| static void sysv_i_callback(struct rcu_head *head) |
| { |
| struct inode *inode = container_of(head, struct inode, i_rcu); |
| kmem_cache_free(sysv_inode_cachep, SYSV_I(inode)); |
| } |
| |
| static void sysv_destroy_inode(struct inode *inode) |
| { |
| call_rcu(&inode->i_rcu, sysv_i_callback); |
| } |
| |
| static void init_once(void *p) |
| { |
| struct sysv_inode_info *si = (struct sysv_inode_info *)p; |
| |
| inode_init_once(&si->vfs_inode); |
| } |
| |
| const struct super_operations sysv_sops = { |
| .alloc_inode = sysv_alloc_inode, |
| .destroy_inode = sysv_destroy_inode, |
| .write_inode = sysv_write_inode, |
| .evict_inode = sysv_evict_inode, |
| .put_super = sysv_put_super, |
| .sync_fs = sysv_sync_fs, |
| .remount_fs = sysv_remount, |
| .statfs = sysv_statfs, |
| }; |
| |
| int __init sysv_init_icache(void) |
| { |
| sysv_inode_cachep = kmem_cache_create("sysv_inode_cache", |
| sizeof(struct sysv_inode_info), 0, |
| SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
| init_once); |
| if (!sysv_inode_cachep) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| void sysv_destroy_icache(void) |
| { |
| /* |
| * Make sure all delayed rcu free inodes are flushed before we |
| * destroy cache. |
| */ |
| rcu_barrier(); |
| kmem_cache_destroy(sysv_inode_cachep); |
| } |