701 lines
16 KiB
C
701 lines
16 KiB
C
/*
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* dir.c
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*
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* Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
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* Copyright (C) 1997 by Volker Lendecke
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*
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* Please add a note about your changes to smbfs in the ChangeLog file.
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*/
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#include <linux/time.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/smp_lock.h>
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#include <linux/ctype.h>
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#include <linux/net.h>
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#include <linux/sched.h>
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#include <linux/smb_fs.h>
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#include <linux/smb_mount.h>
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#include <linux/smbno.h>
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#include "smb_debug.h"
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#include "proto.h"
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static int smb_readdir(struct file *, void *, filldir_t);
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static int smb_dir_open(struct inode *, struct file *);
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static struct dentry *smb_lookup(struct inode *, struct dentry *, struct nameidata *);
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static int smb_create(struct inode *, struct dentry *, int, struct nameidata *);
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static int smb_mkdir(struct inode *, struct dentry *, int);
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static int smb_rmdir(struct inode *, struct dentry *);
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static int smb_unlink(struct inode *, struct dentry *);
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static int smb_rename(struct inode *, struct dentry *,
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struct inode *, struct dentry *);
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static int smb_make_node(struct inode *,struct dentry *,int,dev_t);
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static int smb_link(struct dentry *, struct inode *, struct dentry *);
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const struct file_operations smb_dir_operations =
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{
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.read = generic_read_dir,
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.readdir = smb_readdir,
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.ioctl = smb_ioctl,
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.open = smb_dir_open,
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};
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const struct inode_operations smb_dir_inode_operations =
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{
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.create = smb_create,
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.lookup = smb_lookup,
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.unlink = smb_unlink,
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.mkdir = smb_mkdir,
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.rmdir = smb_rmdir,
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.rename = smb_rename,
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.getattr = smb_getattr,
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.setattr = smb_notify_change,
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};
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const struct inode_operations smb_dir_inode_operations_unix =
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{
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.create = smb_create,
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.lookup = smb_lookup,
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.unlink = smb_unlink,
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.mkdir = smb_mkdir,
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.rmdir = smb_rmdir,
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.rename = smb_rename,
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.getattr = smb_getattr,
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.setattr = smb_notify_change,
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.symlink = smb_symlink,
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.mknod = smb_make_node,
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.link = smb_link,
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};
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/*
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* Read a directory, using filldir to fill the dirent memory.
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* smb_proc_readdir does the actual reading from the smb server.
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*
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* The cache code is almost directly taken from ncpfs
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*/
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static int
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smb_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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struct dentry *dentry = filp->f_path.dentry;
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struct inode *dir = dentry->d_inode;
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struct smb_sb_info *server = server_from_dentry(dentry);
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union smb_dir_cache *cache = NULL;
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struct smb_cache_control ctl;
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struct page *page = NULL;
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int result;
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ctl.page = NULL;
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ctl.cache = NULL;
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VERBOSE("reading %s/%s, f_pos=%d\n",
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DENTRY_PATH(dentry), (int) filp->f_pos);
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result = 0;
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lock_kernel();
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switch ((unsigned int) filp->f_pos) {
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case 0:
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if (filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR) < 0)
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goto out;
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filp->f_pos = 1;
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/* fallthrough */
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case 1:
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if (filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR) < 0)
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goto out;
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filp->f_pos = 2;
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}
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/*
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* Make sure our inode is up-to-date.
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*/
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result = smb_revalidate_inode(dentry);
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if (result)
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goto out;
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page = grab_cache_page(&dir->i_data, 0);
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if (!page)
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goto read_really;
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ctl.cache = cache = kmap(page);
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ctl.head = cache->head;
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if (!PageUptodate(page) || !ctl.head.eof) {
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VERBOSE("%s/%s, page uptodate=%d, eof=%d\n",
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DENTRY_PATH(dentry), PageUptodate(page),ctl.head.eof);
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goto init_cache;
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}
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if (filp->f_pos == 2) {
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if (jiffies - ctl.head.time >= SMB_MAX_AGE(server))
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goto init_cache;
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/*
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* N.B. ncpfs checks mtime of dentry too here, we don't.
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* 1. common smb servers do not update mtime on dir changes
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* 2. it requires an extra smb request
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* (revalidate has the same timeout as ctl.head.time)
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*
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* Instead smbfs invalidates its own cache on local changes
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* and remote changes are not seen until timeout.
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*/
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}
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if (filp->f_pos > ctl.head.end)
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goto finished;
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ctl.fpos = filp->f_pos + (SMB_DIRCACHE_START - 2);
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ctl.ofs = ctl.fpos / SMB_DIRCACHE_SIZE;
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ctl.idx = ctl.fpos % SMB_DIRCACHE_SIZE;
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for (;;) {
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if (ctl.ofs != 0) {
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ctl.page = find_lock_page(&dir->i_data, ctl.ofs);
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if (!ctl.page)
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goto invalid_cache;
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ctl.cache = kmap(ctl.page);
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if (!PageUptodate(ctl.page))
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goto invalid_cache;
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}
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while (ctl.idx < SMB_DIRCACHE_SIZE) {
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struct dentry *dent;
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int res;
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dent = smb_dget_fpos(ctl.cache->dentry[ctl.idx],
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dentry, filp->f_pos);
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if (!dent)
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goto invalid_cache;
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res = filldir(dirent, dent->d_name.name,
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dent->d_name.len, filp->f_pos,
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dent->d_inode->i_ino, DT_UNKNOWN);
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dput(dent);
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if (res)
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goto finished;
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filp->f_pos += 1;
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ctl.idx += 1;
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if (filp->f_pos > ctl.head.end)
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goto finished;
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}
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if (ctl.page) {
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kunmap(ctl.page);
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SetPageUptodate(ctl.page);
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unlock_page(ctl.page);
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page_cache_release(ctl.page);
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ctl.page = NULL;
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}
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ctl.idx = 0;
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ctl.ofs += 1;
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}
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invalid_cache:
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if (ctl.page) {
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kunmap(ctl.page);
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unlock_page(ctl.page);
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page_cache_release(ctl.page);
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ctl.page = NULL;
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}
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ctl.cache = cache;
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init_cache:
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smb_invalidate_dircache_entries(dentry);
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ctl.head.time = jiffies;
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ctl.head.eof = 0;
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ctl.fpos = 2;
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ctl.ofs = 0;
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ctl.idx = SMB_DIRCACHE_START;
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ctl.filled = 0;
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ctl.valid = 1;
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read_really:
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result = server->ops->readdir(filp, dirent, filldir, &ctl);
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if (result == -ERESTARTSYS && page)
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ClearPageUptodate(page);
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if (ctl.idx == -1)
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goto invalid_cache; /* retry */
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ctl.head.end = ctl.fpos - 1;
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ctl.head.eof = ctl.valid;
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finished:
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if (page) {
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cache->head = ctl.head;
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kunmap(page);
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if (result != -ERESTARTSYS)
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SetPageUptodate(page);
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unlock_page(page);
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page_cache_release(page);
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}
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if (ctl.page) {
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kunmap(ctl.page);
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SetPageUptodate(ctl.page);
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unlock_page(ctl.page);
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page_cache_release(ctl.page);
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}
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out:
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unlock_kernel();
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return result;
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}
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static int
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smb_dir_open(struct inode *dir, struct file *file)
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{
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struct dentry *dentry = file->f_path.dentry;
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struct smb_sb_info *server;
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int error = 0;
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VERBOSE("(%s/%s)\n", dentry->d_parent->d_name.name,
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file->f_path.dentry->d_name.name);
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/*
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* Directory timestamps in the core protocol aren't updated
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* when a file is added, so we give them a very short TTL.
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*/
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lock_kernel();
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server = server_from_dentry(dentry);
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if (server->opt.protocol < SMB_PROTOCOL_LANMAN2) {
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unsigned long age = jiffies - SMB_I(dir)->oldmtime;
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if (age > 2*HZ)
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smb_invalid_dir_cache(dir);
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}
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/*
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* Note: in order to allow the smbmount process to open the
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* mount point, we only revalidate if the connection is valid or
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* if the process is trying to access something other than the root.
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*/
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if (server->state == CONN_VALID || !IS_ROOT(dentry))
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error = smb_revalidate_inode(dentry);
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unlock_kernel();
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return error;
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}
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/*
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* Dentry operations routines
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*/
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static int smb_lookup_validate(struct dentry *, struct nameidata *);
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static int smb_hash_dentry(struct dentry *, struct qstr *);
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static int smb_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
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static int smb_delete_dentry(struct dentry *);
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static const struct dentry_operations smbfs_dentry_operations =
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{
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.d_revalidate = smb_lookup_validate,
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.d_hash = smb_hash_dentry,
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.d_compare = smb_compare_dentry,
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.d_delete = smb_delete_dentry,
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};
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static const struct dentry_operations smbfs_dentry_operations_case =
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{
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.d_revalidate = smb_lookup_validate,
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.d_delete = smb_delete_dentry,
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};
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/*
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* This is the callback when the dcache has a lookup hit.
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*/
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static int
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smb_lookup_validate(struct dentry * dentry, struct nameidata *nd)
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{
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struct smb_sb_info *server = server_from_dentry(dentry);
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struct inode * inode = dentry->d_inode;
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unsigned long age = jiffies - dentry->d_time;
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int valid;
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/*
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* The default validation is based on dentry age:
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* we believe in dentries for a few seconds. (But each
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* successful server lookup renews the timestamp.)
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*/
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valid = (age <= SMB_MAX_AGE(server));
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#ifdef SMBFS_DEBUG_VERBOSE
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if (!valid)
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VERBOSE("%s/%s not valid, age=%lu\n",
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DENTRY_PATH(dentry), age);
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#endif
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if (inode) {
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lock_kernel();
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if (is_bad_inode(inode)) {
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PARANOIA("%s/%s has dud inode\n", DENTRY_PATH(dentry));
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valid = 0;
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} else if (!valid)
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valid = (smb_revalidate_inode(dentry) == 0);
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unlock_kernel();
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} else {
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/*
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* What should we do for negative dentries?
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*/
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}
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return valid;
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}
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static int
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smb_hash_dentry(struct dentry *dir, struct qstr *this)
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{
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unsigned long hash;
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int i;
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hash = init_name_hash();
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for (i=0; i < this->len ; i++)
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hash = partial_name_hash(tolower(this->name[i]), hash);
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this->hash = end_name_hash(hash);
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return 0;
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}
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static int
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smb_compare_dentry(struct dentry *dir, struct qstr *a, struct qstr *b)
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{
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int i, result = 1;
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if (a->len != b->len)
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goto out;
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for (i=0; i < a->len; i++) {
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if (tolower(a->name[i]) != tolower(b->name[i]))
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goto out;
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}
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result = 0;
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out:
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return result;
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}
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/*
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* This is the callback from dput() when d_count is going to 0.
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* We use this to unhash dentries with bad inodes.
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*/
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static int
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smb_delete_dentry(struct dentry * dentry)
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{
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if (dentry->d_inode) {
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if (is_bad_inode(dentry->d_inode)) {
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PARANOIA("bad inode, unhashing %s/%s\n",
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DENTRY_PATH(dentry));
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return 1;
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}
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} else {
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/* N.B. Unhash negative dentries? */
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}
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return 0;
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}
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/*
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* Initialize a new dentry
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*/
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void
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smb_new_dentry(struct dentry *dentry)
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{
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struct smb_sb_info *server = server_from_dentry(dentry);
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if (server->mnt->flags & SMB_MOUNT_CASE)
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dentry->d_op = &smbfs_dentry_operations_case;
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else
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dentry->d_op = &smbfs_dentry_operations;
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dentry->d_time = jiffies;
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}
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/*
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* Whenever a lookup succeeds, we know the parent directories
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* are all valid, so we want to update the dentry timestamps.
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* N.B. Move this to dcache?
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*/
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void
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smb_renew_times(struct dentry * dentry)
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{
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dget(dentry);
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spin_lock(&dentry->d_lock);
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for (;;) {
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struct dentry *parent;
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dentry->d_time = jiffies;
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if (IS_ROOT(dentry))
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break;
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parent = dentry->d_parent;
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dget(parent);
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spin_unlock(&dentry->d_lock);
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dput(dentry);
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dentry = parent;
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spin_lock(&dentry->d_lock);
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}
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spin_unlock(&dentry->d_lock);
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dput(dentry);
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}
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static struct dentry *
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smb_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
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{
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struct smb_fattr finfo;
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struct inode *inode;
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int error;
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struct smb_sb_info *server;
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error = -ENAMETOOLONG;
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if (dentry->d_name.len > SMB_MAXNAMELEN)
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goto out;
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/* Do not allow lookup of names with backslashes in */
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error = -EINVAL;
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if (memchr(dentry->d_name.name, '\\', dentry->d_name.len))
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goto out;
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lock_kernel();
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error = smb_proc_getattr(dentry, &finfo);
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#ifdef SMBFS_PARANOIA
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if (error && error != -ENOENT)
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PARANOIA("find %s/%s failed, error=%d\n",
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DENTRY_PATH(dentry), error);
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#endif
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inode = NULL;
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if (error == -ENOENT)
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goto add_entry;
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if (!error) {
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error = -EACCES;
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finfo.f_ino = iunique(dentry->d_sb, 2);
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inode = smb_iget(dir->i_sb, &finfo);
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if (inode) {
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add_entry:
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server = server_from_dentry(dentry);
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if (server->mnt->flags & SMB_MOUNT_CASE)
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dentry->d_op = &smbfs_dentry_operations_case;
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else
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dentry->d_op = &smbfs_dentry_operations;
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d_add(dentry, inode);
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smb_renew_times(dentry);
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error = 0;
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}
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}
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unlock_kernel();
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out:
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return ERR_PTR(error);
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}
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/*
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* This code is common to all routines creating a new inode.
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*/
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static int
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smb_instantiate(struct dentry *dentry, __u16 fileid, int have_id)
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{
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struct smb_sb_info *server = server_from_dentry(dentry);
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struct inode *inode;
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int error;
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struct smb_fattr fattr;
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VERBOSE("file %s/%s, fileid=%u\n", DENTRY_PATH(dentry), fileid);
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error = smb_proc_getattr(dentry, &fattr);
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if (error)
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goto out_close;
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smb_renew_times(dentry);
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fattr.f_ino = iunique(dentry->d_sb, 2);
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inode = smb_iget(dentry->d_sb, &fattr);
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if (!inode)
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goto out_no_inode;
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if (have_id) {
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struct smb_inode_info *ei = SMB_I(inode);
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ei->fileid = fileid;
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ei->access = SMB_O_RDWR;
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ei->open = server->generation;
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}
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d_instantiate(dentry, inode);
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out:
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return error;
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out_no_inode:
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error = -EACCES;
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out_close:
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if (have_id) {
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PARANOIA("%s/%s failed, error=%d, closing %u\n",
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DENTRY_PATH(dentry), error, fileid);
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smb_close_fileid(dentry, fileid);
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}
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goto out;
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}
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/* N.B. How should the mode argument be used? */
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static int
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smb_create(struct inode *dir, struct dentry *dentry, int mode,
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struct nameidata *nd)
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{
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struct smb_sb_info *server = server_from_dentry(dentry);
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__u16 fileid;
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int error;
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|
struct iattr attr;
|
|
|
|
VERBOSE("creating %s/%s, mode=%d\n", DENTRY_PATH(dentry), mode);
|
|
|
|
lock_kernel();
|
|
smb_invalid_dir_cache(dir);
|
|
error = smb_proc_create(dentry, 0, get_seconds(), &fileid);
|
|
if (!error) {
|
|
if (server->opt.capabilities & SMB_CAP_UNIX) {
|
|
/* Set attributes for new file */
|
|
attr.ia_valid = ATTR_MODE;
|
|
attr.ia_mode = mode;
|
|
error = smb_proc_setattr_unix(dentry, &attr, 0, 0);
|
|
}
|
|
error = smb_instantiate(dentry, fileid, 1);
|
|
} else {
|
|
PARANOIA("%s/%s failed, error=%d\n",
|
|
DENTRY_PATH(dentry), error);
|
|
}
|
|
unlock_kernel();
|
|
return error;
|
|
}
|
|
|
|
/* N.B. How should the mode argument be used? */
|
|
static int
|
|
smb_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|
{
|
|
struct smb_sb_info *server = server_from_dentry(dentry);
|
|
int error;
|
|
struct iattr attr;
|
|
|
|
lock_kernel();
|
|
smb_invalid_dir_cache(dir);
|
|
error = smb_proc_mkdir(dentry);
|
|
if (!error) {
|
|
if (server->opt.capabilities & SMB_CAP_UNIX) {
|
|
/* Set attributes for new directory */
|
|
attr.ia_valid = ATTR_MODE;
|
|
attr.ia_mode = mode;
|
|
error = smb_proc_setattr_unix(dentry, &attr, 0, 0);
|
|
}
|
|
error = smb_instantiate(dentry, 0, 0);
|
|
}
|
|
unlock_kernel();
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
smb_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int error;
|
|
|
|
/*
|
|
* Close the directory if it's open.
|
|
*/
|
|
lock_kernel();
|
|
smb_close(inode);
|
|
|
|
/*
|
|
* Check that nobody else is using the directory..
|
|
*/
|
|
error = -EBUSY;
|
|
if (!d_unhashed(dentry))
|
|
goto out;
|
|
|
|
smb_invalid_dir_cache(dir);
|
|
error = smb_proc_rmdir(dentry);
|
|
|
|
out:
|
|
unlock_kernel();
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
smb_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int error;
|
|
|
|
/*
|
|
* Close the file if it's open.
|
|
*/
|
|
lock_kernel();
|
|
smb_close(dentry->d_inode);
|
|
|
|
smb_invalid_dir_cache(dir);
|
|
error = smb_proc_unlink(dentry);
|
|
if (!error)
|
|
smb_renew_times(dentry);
|
|
unlock_kernel();
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
smb_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
int error;
|
|
|
|
/*
|
|
* Close any open files, and check whether to delete the
|
|
* target before attempting the rename.
|
|
*/
|
|
lock_kernel();
|
|
if (old_dentry->d_inode)
|
|
smb_close(old_dentry->d_inode);
|
|
if (new_dentry->d_inode) {
|
|
smb_close(new_dentry->d_inode);
|
|
error = smb_proc_unlink(new_dentry);
|
|
if (error) {
|
|
VERBOSE("unlink %s/%s, error=%d\n",
|
|
DENTRY_PATH(new_dentry), error);
|
|
goto out;
|
|
}
|
|
/* FIXME */
|
|
d_delete(new_dentry);
|
|
}
|
|
|
|
smb_invalid_dir_cache(old_dir);
|
|
smb_invalid_dir_cache(new_dir);
|
|
error = smb_proc_mv(old_dentry, new_dentry);
|
|
if (!error) {
|
|
smb_renew_times(old_dentry);
|
|
smb_renew_times(new_dentry);
|
|
}
|
|
out:
|
|
unlock_kernel();
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* FIXME: samba servers won't let you create device nodes unless uid/gid
|
|
* matches the connection credentials (and we don't know which those are ...)
|
|
*/
|
|
static int
|
|
smb_make_node(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
|
|
{
|
|
int error;
|
|
struct iattr attr;
|
|
|
|
attr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID;
|
|
attr.ia_mode = mode;
|
|
current_euid_egid(&attr.ia_uid, &attr.ia_gid);
|
|
|
|
if (!new_valid_dev(dev))
|
|
return -EINVAL;
|
|
|
|
smb_invalid_dir_cache(dir);
|
|
error = smb_proc_setattr_unix(dentry, &attr, MAJOR(dev), MINOR(dev));
|
|
if (!error) {
|
|
error = smb_instantiate(dentry, 0, 0);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* dentry = existing file
|
|
* new_dentry = new file
|
|
*/
|
|
static int
|
|
smb_link(struct dentry *dentry, struct inode *dir, struct dentry *new_dentry)
|
|
{
|
|
int error;
|
|
|
|
DEBUG1("smb_link old=%s/%s new=%s/%s\n",
|
|
DENTRY_PATH(dentry), DENTRY_PATH(new_dentry));
|
|
smb_invalid_dir_cache(dir);
|
|
error = smb_proc_link(server_from_dentry(dentry), dentry, new_dentry);
|
|
if (!error) {
|
|
smb_renew_times(dentry);
|
|
error = smb_instantiate(new_dentry, 0, 0);
|
|
}
|
|
return error;
|
|
}
|