1 files changed, 318 insertions, 0 deletions

diff --git a/fs/sysv/namei.c b/fs/sysv/namei.c
new file mode 100644
index 000000000000..7f0e4b53085e
--- /dev/null
+++ b/fs/sysv/namei.c
@@ -0,0 +1,318 @@
+/*
+ *  linux/fs/sysv/namei.c
+ *
+ *  minix/namei.c
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  coh/namei.c
+ *  Copyright (C) 1993  Pascal Haible, Bruno Haible
+ *
+ *  sysv/namei.c
+ *  Copyright (C) 1993  Bruno Haible
+ *  Copyright (C) 1997, 1998  Krzysztof G. Baranowski
+ */
+
+#include <linux/pagemap.h>
+#include <linux/smp_lock.h>
+#include "sysv.h"
+
+static inline void inc_count(struct inode *inode)
+{
+        inode->i_nlink++;
+        mark_inode_dirty(inode);
+}
+
+static inline void dec_count(struct inode *inode)
+{
+        inode->i_nlink--;
+        mark_inode_dirty(inode);
+}
+
+static int add_nondir(struct dentry *dentry, struct inode *inode)
+{
+        int err = sysv_add_link(dentry, inode);
+        if (!err) {
+                d_instantiate(dentry, inode);
+                return 0;
+        }
+        dec_count(inode);
+        iput(inode);
+        return err;
+}
+
+static int sysv_hash(struct dentry *dentry, struct qstr *qstr)
+{
+        /* Truncate the name in place, avoids having to define a compare
+           function. */
+        if (qstr->len > SYSV_NAMELEN) {
+                qstr->len = SYSV_NAMELEN;
+                qstr->hash = full_name_hash(qstr->name, qstr->len);
+        }
+        return 0;
+}
+
+struct dentry_operations sysv_dentry_operations = {
+        .d_hash         = sysv_hash,
+};
+
+static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
+{
+        struct inode * inode = NULL;
+        ino_t ino;
+
+        dentry->d_op = dir->i_sb->s_root->d_op;
+        if (dentry->d_name.len > SYSV_NAMELEN)
+                return ERR_PTR(-ENAMETOOLONG);
+        ino = sysv_inode_by_name(dentry);
+
+        if (ino) {
+                inode = iget(dir->i_sb, ino);
+                if (!inode)
+                        return ERR_PTR(-EACCES);
+        }
+        d_add(dentry, inode);
+        return NULL;
+}
+
+static int sysv_mknod(struct inode * dir, struct dentry * dentry, int mode, dev_t rdev)
+{
+        struct inode * inode;
+        int err;
+
+        if (!old_valid_dev(rdev))
+                return -EINVAL;
+
+        inode = sysv_new_inode(dir, mode);
+        err = PTR_ERR(inode);
+
+        if (!IS_ERR(inode)) {
+                sysv_set_inode(inode, rdev);
+                mark_inode_dirty(inode);
+                err = add_nondir(dentry, inode);
+        }
+        return err;
+}
+
+static int sysv_create(struct inode * dir, struct dentry * dentry, int mode, struct nameidata *nd)
+{
+        return sysv_mknod(dir, dentry, mode, 0);
+}
+
+static int sysv_symlink(struct inode * dir, struct dentry * dentry, 
+        const char * symname)
+{
+        int err = -ENAMETOOLONG;
+        int l = strlen(symname)+1;
+        struct inode * inode;
+
+        if (l > dir->i_sb->s_blocksize)
+                goto out;
+
+        inode = sysv_new_inode(dir, S_IFLNK|0777);
+        err = PTR_ERR(inode);
+        if (IS_ERR(inode))
+                goto out;
+        
+        sysv_set_inode(inode, 0);
+        err = page_symlink(inode, symname, l);
+        if (err)
+                goto out_fail;
+
+        mark_inode_dirty(inode);
+        err = add_nondir(dentry, inode);
+out:
+        return err;
+
+out_fail:
+        dec_count(inode);
+        iput(inode);
+        goto out;
+}
+
+static int sysv_link(struct dentry * old_dentry, struct inode * dir, 
+        struct dentry * dentry)
+{
+        struct inode *inode = old_dentry->d_inode;
+
+        if (inode->i_nlink >= SYSV_SB(inode->i_sb)->s_link_max)
+                return -EMLINK;
+
+        inode->i_ctime = CURRENT_TIME_SEC;
+        inc_count(inode);
+        atomic_inc(&inode->i_count);
+
+        return add_nondir(dentry, inode);
+}
+
+static int sysv_mkdir(struct inode * dir, struct dentry *dentry, int mode)
+{
+        struct inode * inode;
+        int err = -EMLINK;
+
+        if (dir->i_nlink >= SYSV_SB(dir->i_sb)->s_link_max) 
+                goto out;
+        inc_count(dir);
+
+        inode = sysv_new_inode(dir, S_IFDIR|mode);
+        err = PTR_ERR(inode);
+        if (IS_ERR(inode))
+                goto out_dir;
+
+        sysv_set_inode(inode, 0);
+
+        inc_count(inode);
+
+        err = sysv_make_empty(inode, dir);
+        if (err)
+                goto out_fail;
+
+        err = sysv_add_link(dentry, inode);
+        if (err)
+                goto out_fail;
+
+        d_instantiate(dentry, inode);
+out:
+        return err;
+
+out_fail:
+        dec_count(inode);
+        dec_count(inode);
+        iput(inode);
+out_dir:
+        dec_count(dir);
+        goto out;
+}
+
+static int sysv_unlink(struct inode * dir, struct dentry * dentry)
+{
+        struct inode * inode = dentry->d_inode;
+        struct page * page;
+        struct sysv_dir_entry * de;
+        int err = -ENOENT;
+
+        de = sysv_find_entry(dentry, &page);
+        if (!de)
+                goto out;
+
+        err = sysv_delete_entry (de, page);
+        if (err)
+                goto out;
+
+        inode->i_ctime = dir->i_ctime;
+        dec_count(inode);
+out:
+        return err;
+}
+
+static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
+{
+        struct inode *inode = dentry->d_inode;
+        int err = -ENOTEMPTY;
+
+        if (sysv_empty_dir(inode)) {
+                err = sysv_unlink(dir, dentry);
+                if (!err) {
+                        inode->i_size = 0;
+                        dec_count(inode);
+                        dec_count(dir);
+                }
+        }
+        return err;
+}
+
+/*
+ * Anybody can rename anything with this: the permission checks are left to the
+ * higher-level routines.
+ */
+static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
+                  struct inode * new_dir, struct dentry * new_dentry)
+{
+        struct inode * old_inode = old_dentry->d_inode;
+        struct inode * new_inode = new_dentry->d_inode;
+        struct page * dir_page = NULL;
+        struct sysv_dir_entry * dir_de = NULL;
+        struct page * old_page;
+        struct sysv_dir_entry * old_de;
+        int err = -ENOENT;
+
+        old_de = sysv_find_entry(old_dentry, &old_page);
+        if (!old_de)
+                goto out;
+
+        if (S_ISDIR(old_inode->i_mode)) {
+                err = -EIO;
+                dir_de = sysv_dotdot(old_inode, &dir_page);
+                if (!dir_de)
+                        goto out_old;
+        }
+
+        if (new_inode) {
+                struct page * new_page;
+                struct sysv_dir_entry * new_de;
+
+                err = -ENOTEMPTY;
+                if (dir_de && !sysv_empty_dir(new_inode))
+                        goto out_dir;
+
+                err = -ENOENT;
+                new_de = sysv_find_entry(new_dentry, &new_page);
+                if (!new_de)
+                        goto out_dir;
+                inc_count(old_inode);
+                sysv_set_link(new_de, new_page, old_inode);
+                new_inode->i_ctime = CURRENT_TIME_SEC;
+                if (dir_de)
+                        new_inode->i_nlink--;
+                dec_count(new_inode);
+        } else {
+                if (dir_de) {
+                        err = -EMLINK;
+                        if (new_dir->i_nlink >= SYSV_SB(new_dir->i_sb)->s_link_max)
+                                goto out_dir;
+                }
+                inc_count(old_inode);
+                err = sysv_add_link(new_dentry, old_inode);
+                if (err) {
+                        dec_count(old_inode);
+                        goto out_dir;
+                }
+                if (dir_de)
+                        inc_count(new_dir);
+        }
+
+        sysv_delete_entry(old_de, old_page);
+        dec_count(old_inode);
+
+        if (dir_de) {
+                sysv_set_link(dir_de, dir_page, new_dir);
+                dec_count(old_dir);
+        }
+        return 0;
+
+out_dir:
+        if (dir_de) {
+                kunmap(dir_page);
+                page_cache_release(dir_page);
+        }
+out_old:
+        kunmap(old_page);
+        page_cache_release(old_page);
+out:
+        return err;
+}
+
+/*
+ * directories can handle most operations...
+ */
+struct inode_operations sysv_dir_inode_operations = {
+        .create         = sysv_create,
+        .lookup         = sysv_lookup,
+        .link           = sysv_link,
+        .unlink         = sysv_unlink,
+        .symlink        = sysv_symlink,
+        .mkdir          = sysv_mkdir,
+        .rmdir          = sysv_rmdir,
+        .mknod          = sysv_mknod,
+        .rename         = sysv_rename,
+        .getattr        = sysv_getattr,
+};