--- /dev/null
+/*
+ * 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)) {
+ if (inode->i_blocks) {
+ inode->i_op = &sysv_symlink_inode_operations;
+ inode->i_mapping->a_ops = &sysv_aops;
+ } else {
+ inode->i_op = &sysv_fast_symlink_inode_operations;
+ nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
+ sizeof(SYSV_I(inode)->i_data) - 1);
+ }
+ } 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);
+}
Code Review / kvmfornfv.git / blobdiff