![Dave Hansen](/assets/img/avatar_default.png)
This is mostly included for parity with dec_nlink(), where we will have some more hooks. This one should stay pretty darn straightforward for now. Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Acked-by: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
706 lines
17 KiB
C
706 lines
17 KiB
C
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/*
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* Directory operations for Coda filesystem
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* Original version: (C) 1996 P. Braam and M. Callahan
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* Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
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*
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* Carnegie Mellon encourages users to contribute improvements to
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* the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/smp_lock.h>
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#include <asm/uaccess.h>
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#include <linux/coda.h>
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#include <linux/coda_linux.h>
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#include <linux/coda_psdev.h>
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#include <linux/coda_fs_i.h>
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#include <linux/coda_cache.h>
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#include <linux/coda_proc.h>
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#include "coda_int.h"
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/* dir inode-ops */
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static int coda_create(struct inode *dir, struct dentry *new, int mode, struct nameidata *nd);
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static struct dentry *coda_lookup(struct inode *dir, struct dentry *target, struct nameidata *nd);
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static int coda_link(struct dentry *old_dentry, struct inode *dir_inode,
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struct dentry *entry);
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static int coda_unlink(struct inode *dir_inode, struct dentry *entry);
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static int coda_symlink(struct inode *dir_inode, struct dentry *entry,
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const char *symname);
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static int coda_mkdir(struct inode *dir_inode, struct dentry *entry, int mode);
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static int coda_rmdir(struct inode *dir_inode, struct dentry *entry);
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static int coda_rename(struct inode *old_inode, struct dentry *old_dentry,
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struct inode *new_inode, struct dentry *new_dentry);
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/* dir file-ops */
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static int coda_readdir(struct file *file, void *dirent, filldir_t filldir);
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/* dentry ops */
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static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd);
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static int coda_dentry_delete(struct dentry *);
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/* support routines */
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static int coda_venus_readdir(struct file *filp, filldir_t filldir,
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void *dirent, struct dentry *dir);
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/* same as fs/bad_inode.c */
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static int coda_return_EIO(void)
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{
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return -EIO;
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}
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#define CODA_EIO_ERROR ((void *) (coda_return_EIO))
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static struct dentry_operations coda_dentry_operations =
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{
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.d_revalidate = coda_dentry_revalidate,
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.d_delete = coda_dentry_delete,
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};
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struct inode_operations coda_dir_inode_operations =
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{
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.create = coda_create,
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.lookup = coda_lookup,
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.link = coda_link,
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.unlink = coda_unlink,
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.symlink = coda_symlink,
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.mkdir = coda_mkdir,
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.rmdir = coda_rmdir,
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.mknod = CODA_EIO_ERROR,
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.rename = coda_rename,
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.permission = coda_permission,
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.getattr = coda_getattr,
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.setattr = coda_setattr,
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};
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const struct file_operations coda_dir_operations = {
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.llseek = generic_file_llseek,
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.read = generic_read_dir,
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.readdir = coda_readdir,
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.open = coda_open,
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.flush = coda_flush,
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.release = coda_release,
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.fsync = coda_fsync,
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};
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/* inode operations for directories */
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/* access routines: lookup, readlink, permission */
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static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd)
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{
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struct inode *res_inode = NULL;
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struct CodaFid resfid = { { 0, } };
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int dropme = 0; /* to indicate entry should not be cached */
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int type = 0;
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int error = 0;
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const char *name = entry->d_name.name;
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size_t length = entry->d_name.len;
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if ( length > CODA_MAXNAMLEN ) {
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printk("name too long: lookup, %s (%*s)\n",
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coda_i2s(dir), (int)length, name);
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return ERR_PTR(-ENAMETOOLONG);
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}
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lock_kernel();
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/* control object, create inode on the fly */
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if (coda_isroot(dir) && coda_iscontrol(name, length)) {
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error = coda_cnode_makectl(&res_inode, dir->i_sb);
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dropme = 1;
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goto exit;
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}
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error = venus_lookup(dir->i_sb, coda_i2f(dir),
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(const char *)name, length, &type, &resfid);
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res_inode = NULL;
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if (!error) {
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if (type & CODA_NOCACHE) {
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type &= (~CODA_NOCACHE);
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dropme = 1;
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}
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error = coda_cnode_make(&res_inode, &resfid, dir->i_sb);
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if (error) {
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unlock_kernel();
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return ERR_PTR(error);
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}
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} else if (error != -ENOENT) {
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unlock_kernel();
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return ERR_PTR(error);
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}
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exit:
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entry->d_time = 0;
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entry->d_op = &coda_dentry_operations;
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d_add(entry, res_inode);
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if ( dropme ) {
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d_drop(entry);
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coda_flag_inode(res_inode, C_VATTR);
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}
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unlock_kernel();
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return NULL;
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}
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int coda_permission(struct inode *inode, int mask, struct nameidata *nd)
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{
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int error = 0;
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if (!mask)
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return 0;
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lock_kernel();
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coda_vfs_stat.permission++;
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if (coda_cache_check(inode, mask))
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goto out;
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error = venus_access(inode->i_sb, coda_i2f(inode), mask);
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if (!error)
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coda_cache_enter(inode, mask);
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out:
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unlock_kernel();
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return error;
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}
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static inline void coda_dir_changed(struct inode *dir, int link)
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{
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#ifdef REQUERY_VENUS_FOR_MTIME
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/* invalidate the directory cnode's attributes so we refetch the
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* attributes from venus next time the inode is referenced */
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coda_flag_inode(dir, C_VATTR);
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#else
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/* optimistically we can also act as if our nose bleeds. The
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* granularity of the mtime is coarse anyways so we might actually be
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* right most of the time. Note: we only do this for directories. */
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dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
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#endif
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if (link)
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dir->i_nlink += link;
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}
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/* creation routines: create, mknod, mkdir, link, symlink */
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static int coda_create(struct inode *dir, struct dentry *de, int mode, struct nameidata *nd)
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{
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int error=0;
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const char *name=de->d_name.name;
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int length=de->d_name.len;
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struct inode *inode;
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struct CodaFid newfid;
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struct coda_vattr attrs;
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lock_kernel();
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coda_vfs_stat.create++;
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if (coda_isroot(dir) && coda_iscontrol(name, length)) {
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unlock_kernel();
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return -EPERM;
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}
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error = venus_create(dir->i_sb, coda_i2f(dir), name, length,
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0, mode, &newfid, &attrs);
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if ( error ) {
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unlock_kernel();
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d_drop(de);
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return error;
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}
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inode = coda_iget(dir->i_sb, &newfid, &attrs);
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if ( IS_ERR(inode) ) {
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unlock_kernel();
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d_drop(de);
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return PTR_ERR(inode);
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}
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/* invalidate the directory cnode's attributes */
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coda_dir_changed(dir, 0);
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unlock_kernel();
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d_instantiate(de, inode);
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return 0;
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}
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static int coda_mkdir(struct inode *dir, struct dentry *de, int mode)
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{
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struct inode *inode;
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struct coda_vattr attrs;
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const char *name = de->d_name.name;
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int len = de->d_name.len;
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int error;
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struct CodaFid newfid;
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lock_kernel();
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coda_vfs_stat.mkdir++;
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if (coda_isroot(dir) && coda_iscontrol(name, len)) {
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unlock_kernel();
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return -EPERM;
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}
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attrs.va_mode = mode;
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error = venus_mkdir(dir->i_sb, coda_i2f(dir),
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name, len, &newfid, &attrs);
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if ( error ) {
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unlock_kernel();
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d_drop(de);
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return error;
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}
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inode = coda_iget(dir->i_sb, &newfid, &attrs);
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if ( IS_ERR(inode) ) {
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unlock_kernel();
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d_drop(de);
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return PTR_ERR(inode);
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}
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/* invalidate the directory cnode's attributes */
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coda_dir_changed(dir, 1);
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unlock_kernel();
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d_instantiate(de, inode);
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return 0;
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}
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/* try to make de an entry in dir_inodde linked to source_de */
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static int coda_link(struct dentry *source_de, struct inode *dir_inode,
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struct dentry *de)
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{
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struct inode *inode = source_de->d_inode;
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const char * name = de->d_name.name;
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int len = de->d_name.len;
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int error;
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lock_kernel();
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coda_vfs_stat.link++;
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if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) {
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unlock_kernel();
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return -EPERM;
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}
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error = venus_link(dir_inode->i_sb, coda_i2f(inode),
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coda_i2f(dir_inode), (const char *)name, len);
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if (error) {
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d_drop(de);
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goto out;
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}
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coda_dir_changed(dir_inode, 0);
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atomic_inc(&inode->i_count);
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d_instantiate(de, inode);
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inc_nlink(inode);
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out:
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unlock_kernel();
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return(error);
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}
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static int coda_symlink(struct inode *dir_inode, struct dentry *de,
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const char *symname)
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{
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const char *name = de->d_name.name;
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int len = de->d_name.len;
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int symlen;
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int error=0;
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lock_kernel();
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coda_vfs_stat.symlink++;
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if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) {
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unlock_kernel();
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return -EPERM;
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}
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symlen = strlen(symname);
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if ( symlen > CODA_MAXPATHLEN ) {
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unlock_kernel();
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return -ENAMETOOLONG;
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}
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/*
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* This entry is now negative. Since we do not create
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* an inode for the entry we have to drop it.
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*/
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d_drop(de);
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error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
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symname, symlen);
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/* mtime is no good anymore */
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if ( !error )
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coda_dir_changed(dir_inode, 0);
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unlock_kernel();
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return error;
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}
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/* destruction routines: unlink, rmdir */
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int coda_unlink(struct inode *dir, struct dentry *de)
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{
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int error;
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const char *name = de->d_name.name;
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int len = de->d_name.len;
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lock_kernel();
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coda_vfs_stat.unlink++;
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error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
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if ( error ) {
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unlock_kernel();
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return error;
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}
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coda_dir_changed(dir, 0);
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drop_nlink(de->d_inode);
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unlock_kernel();
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return 0;
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}
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int coda_rmdir(struct inode *dir, struct dentry *de)
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{
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const char *name = de->d_name.name;
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int len = de->d_name.len;
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int error;
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lock_kernel();
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coda_vfs_stat.rmdir++;
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if (!d_unhashed(de)) {
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unlock_kernel();
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return -EBUSY;
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}
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error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
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if ( error ) {
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unlock_kernel();
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return error;
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}
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coda_dir_changed(dir, -1);
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drop_nlink(de->d_inode);
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d_delete(de);
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unlock_kernel();
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return 0;
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}
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/* rename */
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static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry)
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{
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const char *old_name = old_dentry->d_name.name;
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const char *new_name = new_dentry->d_name.name;
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int old_length = old_dentry->d_name.len;
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int new_length = new_dentry->d_name.len;
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int link_adjust = 0;
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int error;
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lock_kernel();
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coda_vfs_stat.rename++;
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error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
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coda_i2f(new_dir), old_length, new_length,
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(const char *) old_name, (const char *)new_name);
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if ( !error ) {
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if ( new_dentry->d_inode ) {
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if ( S_ISDIR(new_dentry->d_inode->i_mode) )
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link_adjust = 1;
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coda_dir_changed(old_dir, -link_adjust);
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coda_dir_changed(new_dir, link_adjust);
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coda_flag_inode(new_dentry->d_inode, C_VATTR);
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} else {
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coda_flag_inode(old_dir, C_VATTR);
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coda_flag_inode(new_dir, C_VATTR);
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}
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}
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unlock_kernel();
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return error;
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}
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/* file operations for directories */
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int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir)
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{
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struct dentry *coda_dentry = coda_file->f_dentry;
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struct coda_file_info *cfi;
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struct file *host_file;
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struct inode *host_inode;
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int ret;
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cfi = CODA_FTOC(coda_file);
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BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
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host_file = cfi->cfi_container;
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coda_vfs_stat.readdir++;
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host_inode = host_file->f_dentry->d_inode;
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mutex_lock(&host_inode->i_mutex);
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host_file->f_pos = coda_file->f_pos;
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if (!host_file->f_op->readdir) {
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/* Venus: we must read Venus dirents from the file */
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ret = coda_venus_readdir(host_file, filldir, dirent, coda_dentry);
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} else {
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/* potemkin case: we were handed a directory inode. */
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/* Yuk, we can't call vfs_readdir because we are already
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* holding the inode semaphore. */
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ret = -ENOTDIR;
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if (!host_file->f_op || !host_file->f_op->readdir)
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goto out;
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ret = -ENOENT;
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if (!IS_DEADDIR(host_inode)) {
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ret = host_file->f_op->readdir(host_file, filldir, dirent);
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file_accessed(host_file);
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}
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}
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out:
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coda_file->f_pos = host_file->f_pos;
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mutex_unlock(&host_inode->i_mutex);
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return ret;
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}
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static inline unsigned int CDT2DT(unsigned char cdt)
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{
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unsigned int dt;
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switch(cdt) {
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case CDT_UNKNOWN: dt = DT_UNKNOWN; break;
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case CDT_FIFO: dt = DT_FIFO; break;
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case CDT_CHR: dt = DT_CHR; break;
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case CDT_DIR: dt = DT_DIR; break;
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case CDT_BLK: dt = DT_BLK; break;
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case CDT_REG: dt = DT_REG; break;
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case CDT_LNK: dt = DT_LNK; break;
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case CDT_SOCK: dt = DT_SOCK; break;
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case CDT_WHT: dt = DT_WHT; break;
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default: dt = DT_UNKNOWN; break;
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}
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return dt;
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}
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/* support routines */
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static int coda_venus_readdir(struct file *filp, filldir_t filldir,
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void *dirent, struct dentry *dir)
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{
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int result = 0; /* # of entries returned */
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struct venus_dirent *vdir;
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unsigned long vdir_size =
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(unsigned long)(&((struct venus_dirent *)0)->d_name);
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unsigned int type;
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struct qstr name;
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ino_t ino;
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int ret, i;
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vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
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if (!vdir) return -ENOMEM;
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|
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i = filp->f_pos;
|
|
switch(i) {
|
|
case 0:
|
|
ret = filldir(dirent, ".", 1, 0, dir->d_inode->i_ino, DT_DIR);
|
|
if (ret < 0) break;
|
|
result++;
|
|
filp->f_pos++;
|
|
/* fallthrough */
|
|
case 1:
|
|
ret = filldir(dirent, "..", 2, 1, dir->d_parent->d_inode->i_ino, DT_DIR);
|
|
if (ret < 0) break;
|
|
result++;
|
|
filp->f_pos++;
|
|
/* fallthrough */
|
|
default:
|
|
while (1) {
|
|
/* read entries from the directory file */
|
|
ret = kernel_read(filp, filp->f_pos - 2, (char *)vdir,
|
|
sizeof(*vdir));
|
|
if (ret < 0) {
|
|
printk("coda_venus_readdir: read dir failed %d\n", ret);
|
|
break;
|
|
}
|
|
if (ret == 0) break; /* end of directory file reached */
|
|
|
|
/* catch truncated reads */
|
|
if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
|
|
printk("coda_venus_readdir: short read: %ld\n",
|
|
filp->f_dentry->d_inode->i_ino);
|
|
ret = -EBADF;
|
|
break;
|
|
}
|
|
/* validate whether the directory file actually makes sense */
|
|
if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
|
|
printk("coda_venus_readdir: Invalid dir: %ld\n",
|
|
filp->f_dentry->d_inode->i_ino);
|
|
ret = -EBADF;
|
|
break;
|
|
}
|
|
|
|
name.len = vdir->d_namlen;
|
|
name.name = vdir->d_name;
|
|
|
|
/* Make sure we skip '.' and '..', we already got those */
|
|
if (name.name[0] == '.' && (name.len == 1 ||
|
|
(vdir->d_name[1] == '.' && name.len == 2)))
|
|
vdir->d_fileno = name.len = 0;
|
|
|
|
/* skip null entries */
|
|
if (vdir->d_fileno && name.len) {
|
|
/* try to look up this entry in the dcache, that way
|
|
* userspace doesn't have to worry about breaking
|
|
* getcwd by having mismatched inode numbers for
|
|
* internal volume mountpoints. */
|
|
ino = find_inode_number(dir, &name);
|
|
if (!ino) ino = vdir->d_fileno;
|
|
|
|
type = CDT2DT(vdir->d_type);
|
|
ret = filldir(dirent, name.name, name.len, filp->f_pos,
|
|
ino, type);
|
|
/* failure means no space for filling in this round */
|
|
if (ret < 0) break;
|
|
result++;
|
|
}
|
|
/* we'll always have progress because d_reclen is unsigned and
|
|
* we've already established it is non-zero. */
|
|
filp->f_pos += vdir->d_reclen;
|
|
}
|
|
}
|
|
kfree(vdir);
|
|
return result ? result : ret;
|
|
}
|
|
|
|
/* called when a cache lookup succeeds */
|
|
static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd)
|
|
{
|
|
struct inode *inode = de->d_inode;
|
|
struct coda_inode_info *cii;
|
|
|
|
if (!inode)
|
|
return 1;
|
|
lock_kernel();
|
|
if (coda_isroot(inode))
|
|
goto out;
|
|
if (is_bad_inode(inode))
|
|
goto bad;
|
|
|
|
cii = ITOC(de->d_inode);
|
|
if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
|
|
goto out;
|
|
|
|
shrink_dcache_parent(de);
|
|
|
|
/* propagate for a flush */
|
|
if (cii->c_flags & C_FLUSH)
|
|
coda_flag_inode_children(inode, C_FLUSH);
|
|
|
|
if (atomic_read(&de->d_count) > 1)
|
|
/* pretend it's valid, but don't change the flags */
|
|
goto out;
|
|
|
|
/* clear the flags. */
|
|
cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
|
|
|
|
bad:
|
|
unlock_kernel();
|
|
return 0;
|
|
out:
|
|
unlock_kernel();
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* This is the callback from dput() when d_count is going to 0.
|
|
* We use this to unhash dentries with bad inodes.
|
|
*/
|
|
static int coda_dentry_delete(struct dentry * dentry)
|
|
{
|
|
int flags;
|
|
|
|
if (!dentry->d_inode)
|
|
return 0;
|
|
|
|
flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE;
|
|
if (is_bad_inode(dentry->d_inode) || flags) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* This is called when we want to check if the inode has
|
|
* changed on the server. Coda makes this easy since the
|
|
* cache manager Venus issues a downcall to the kernel when this
|
|
* happens
|
|
*/
|
|
int coda_revalidate_inode(struct dentry *dentry)
|
|
{
|
|
struct coda_vattr attr;
|
|
int error = 0;
|
|
int old_mode;
|
|
ino_t old_ino;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct coda_inode_info *cii = ITOC(inode);
|
|
|
|
lock_kernel();
|
|
if ( !cii->c_flags )
|
|
goto ok;
|
|
|
|
if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) {
|
|
error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr);
|
|
if ( error )
|
|
goto return_bad;
|
|
|
|
/* this inode may be lost if:
|
|
- it's ino changed
|
|
- type changes must be permitted for repair and
|
|
missing mount points.
|
|
*/
|
|
old_mode = inode->i_mode;
|
|
old_ino = inode->i_ino;
|
|
coda_vattr_to_iattr(inode, &attr);
|
|
|
|
if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) {
|
|
printk("Coda: inode %ld, fid %s changed type!\n",
|
|
inode->i_ino, coda_f2s(&(cii->c_fid)));
|
|
}
|
|
|
|
/* the following can happen when a local fid is replaced
|
|
with a global one, here we lose and declare the inode bad */
|
|
if (inode->i_ino != old_ino)
|
|
goto return_bad;
|
|
|
|
coda_flag_inode_children(inode, C_FLUSH);
|
|
cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
|
|
}
|
|
|
|
ok:
|
|
unlock_kernel();
|
|
return 0;
|
|
|
|
return_bad:
|
|
unlock_kernel();
|
|
return -EIO;
|
|
}
|