1 files changed, 317 insertions, 0 deletions

diff --git a/fs/minix/namei.c b/fs/minix/namei.c
new file mode 100644
index 000000000000..b25bca5bdb57
--- /dev/null
+++ b/fs/minix/namei.c
@@ -0,0 +1,317 @@
+/*
+ *  linux/fs/minix/namei.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include "minix.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 = minix_add_link(dentry, inode);
+        if (!err) {
+                d_instantiate(dentry, inode);
+                return 0;
+        }
+        dec_count(inode);
+        iput(inode);
+        return err;
+}
+
+static int minix_hash(struct dentry *dentry, struct qstr *qstr)
+{
+        unsigned long hash;
+        int i;
+        const unsigned char *name;
+
+        i = minix_sb(dentry->d_inode->i_sb)->s_namelen;
+        if (i >= qstr->len)
+                return 0;
+        /* Truncate the name in place, avoids having to define a compare
+           function. */
+        qstr->len = i;
+        name = qstr->name;
+        hash = init_name_hash();
+        while (i--)
+                hash = partial_name_hash(*name++, hash);
+        qstr->hash = end_name_hash(hash);
+        return 0;
+}
+
+struct dentry_operations minix_dentry_operations = {
+        .d_hash         = minix_hash,
+};
+
+static struct dentry *minix_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 > minix_sb(dir->i_sb)->s_namelen)
+                return ERR_PTR(-ENAMETOOLONG);
+
+        ino = minix_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 minix_mknod(struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
+{
+        int error;
+        struct inode *inode;
+
+        if (!old_valid_dev(rdev))
+                return -EINVAL;
+
+        inode = minix_new_inode(dir, &error);
+
+        if (inode) {
+                inode->i_mode = mode;
+                minix_set_inode(inode, rdev);
+                mark_inode_dirty(inode);
+                error = add_nondir(dentry, inode);
+        }
+        return error;
+}
+
+static int minix_create(struct inode * dir, struct dentry *dentry, int mode,
+                struct nameidata *nd)
+{
+        return minix_mknod(dir, dentry, mode, 0);
+}
+
+static int minix_symlink(struct inode * dir, struct dentry *dentry,
+          const char * symname)
+{
+        int err = -ENAMETOOLONG;
+        int i = strlen(symname)+1;
+        struct inode * inode;
+
+        if (i > dir->i_sb->s_blocksize)
+                goto out;
+
+        inode = minix_new_inode(dir, &err);
+        if (!inode)
+                goto out;
+
+        inode->i_mode = S_IFLNK | 0777;
+        minix_set_inode(inode, 0);
+        err = page_symlink(inode, symname, i);
+        if (err)
+                goto out_fail;
+
+        err = add_nondir(dentry, inode);
+out:
+        return err;
+
+out_fail:
+        dec_count(inode);
+        iput(inode);
+        goto out;
+}
+
+static int minix_link(struct dentry * old_dentry, struct inode * dir,
+        struct dentry *dentry)
+{
+        struct inode *inode = old_dentry->d_inode;
+
+        if (inode->i_nlink >= minix_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 minix_mkdir(struct inode * dir, struct dentry *dentry, int mode)
+{
+        struct inode * inode;
+        int err = -EMLINK;
+
+        if (dir->i_nlink >= minix_sb(dir->i_sb)->s_link_max)
+                goto out;
+
+        inc_count(dir);
+
+        inode = minix_new_inode(dir, &err);
+        if (!inode)
+                goto out_dir;
+
+        inode->i_mode = S_IFDIR | mode;
+        if (dir->i_mode & S_ISGID)
+                inode->i_mode |= S_ISGID;
+        minix_set_inode(inode, 0);
+
+        inc_count(inode);
+
+        err = minix_make_empty(inode, dir);
+        if (err)
+                goto out_fail;
+
+        err = minix_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 minix_unlink(struct inode * dir, struct dentry *dentry)
+{
+        int err = -ENOENT;
+        struct inode * inode = dentry->d_inode;
+        struct page * page;
+        struct minix_dir_entry * de;
+
+        de = minix_find_entry(dentry, &page);
+        if (!de)
+                goto end_unlink;
+
+        err = minix_delete_entry(de, page);
+        if (err)
+                goto end_unlink;
+
+        inode->i_ctime = dir->i_ctime;
+        dec_count(inode);
+end_unlink:
+        return err;
+}
+
+static int minix_rmdir(struct inode * dir, struct dentry *dentry)
+{
+        struct inode * inode = dentry->d_inode;
+        int err = -ENOTEMPTY;
+
+        if (minix_empty_dir(inode)) {
+                err = minix_unlink(dir, dentry);
+                if (!err) {
+                        dec_count(dir);
+                        dec_count(inode);
+                }
+        }
+        return err;
+}
+
+static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
+                           struct inode * new_dir, struct dentry *new_dentry)
+{
+        struct minix_sb_info * info = minix_sb(old_dir->i_sb);
+        struct inode * old_inode = old_dentry->d_inode;
+        struct inode * new_inode = new_dentry->d_inode;
+        struct page * dir_page = NULL;
+        struct minix_dir_entry * dir_de = NULL;
+        struct page * old_page;
+        struct minix_dir_entry * old_de;
+        int err = -ENOENT;
+
+        old_de = minix_find_entry(old_dentry, &old_page);
+        if (!old_de)
+                goto out;
+
+        if (S_ISDIR(old_inode->i_mode)) {
+                err = -EIO;
+                dir_de = minix_dotdot(old_inode, &dir_page);
+                if (!dir_de)
+                        goto out_old;
+        }
+
+        if (new_inode) {
+                struct page * new_page;
+                struct minix_dir_entry * new_de;
+
+                err = -ENOTEMPTY;
+                if (dir_de && !minix_empty_dir(new_inode))
+                        goto out_dir;
+
+                err = -ENOENT;
+                new_de = minix_find_entry(new_dentry, &new_page);
+                if (!new_de)
+                        goto out_dir;
+                inc_count(old_inode);
+                minix_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 >= info->s_link_max)
+                                goto out_dir;
+                }
+                inc_count(old_inode);
+                err = minix_add_link(new_dentry, old_inode);
+                if (err) {
+                        dec_count(old_inode);
+                        goto out_dir;
+                }
+                if (dir_de)
+                        inc_count(new_dir);
+        }
+
+        minix_delete_entry(old_de, old_page);
+        dec_count(old_inode);
+
+        if (dir_de) {
+                minix_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 minix_dir_inode_operations = {
+        .create         = minix_create,
+        .lookup         = minix_lookup,
+        .link           = minix_link,
+        .unlink         = minix_unlink,
+        .symlink        = minix_symlink,
+        .mkdir          = minix_mkdir,
+        .rmdir          = minix_rmdir,
+        .mknod          = minix_mknod,
+        .rename         = minix_rename,
+        .getattr        = minix_getattr,
+};