+++ /dev/null
-/*
- * dir.c
- *
- * Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
- * Copyright (C) 1997 by Volker Lendecke
- *
- * Please add a note about your changes to smbfs in the ChangeLog file.
- */
-
-#include <linux/time.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/smp_lock.h>
-#include <linux/ctype.h>
-#include <linux/net.h>
-#include <linux/sched.h>
-
-#include <linux/smb_fs.h>
-#include <linux/smb_mount.h>
-#include <linux/smbno.h>
-
-#include "smb_debug.h"
-#include "proto.h"
-
-static int smb_readdir(struct file *, void *, filldir_t);
-static int smb_dir_open(struct inode *, struct file *);
-
-static struct dentry *smb_lookup(struct inode *, struct dentry *, struct nameidata *);
-static int smb_create(struct inode *, struct dentry *, int, struct nameidata *);
-static int smb_mkdir(struct inode *, struct dentry *, int);
-static int smb_rmdir(struct inode *, struct dentry *);
-static int smb_unlink(struct inode *, struct dentry *);
-static int smb_rename(struct inode *, struct dentry *,
- struct inode *, struct dentry *);
-static int smb_make_node(struct inode *,struct dentry *,int,dev_t);
-static int smb_link(struct dentry *, struct inode *, struct dentry *);
-
-const struct file_operations smb_dir_operations =
-{
- .llseek = generic_file_llseek,
- .read = generic_read_dir,
- .readdir = smb_readdir,
- .unlocked_ioctl = smb_ioctl,
- .open = smb_dir_open,
-};
-
-const struct inode_operations smb_dir_inode_operations =
-{
- .create = smb_create,
- .lookup = smb_lookup,
- .unlink = smb_unlink,
- .mkdir = smb_mkdir,
- .rmdir = smb_rmdir,
- .rename = smb_rename,
- .getattr = smb_getattr,
- .setattr = smb_notify_change,
-};
-
-const struct inode_operations smb_dir_inode_operations_unix =
-{
- .create = smb_create,
- .lookup = smb_lookup,
- .unlink = smb_unlink,
- .mkdir = smb_mkdir,
- .rmdir = smb_rmdir,
- .rename = smb_rename,
- .getattr = smb_getattr,
- .setattr = smb_notify_change,
- .symlink = smb_symlink,
- .mknod = smb_make_node,
- .link = smb_link,
-};
-
-/*
- * Read a directory, using filldir to fill the dirent memory.
- * smb_proc_readdir does the actual reading from the smb server.
- *
- * The cache code is almost directly taken from ncpfs
- */
-static int
-smb_readdir(struct file *filp, void *dirent, filldir_t filldir)
-{
- struct dentry *dentry = filp->f_path.dentry;
- struct inode *dir = dentry->d_inode;
- struct smb_sb_info *server = server_from_dentry(dentry);
- union smb_dir_cache *cache = NULL;
- struct smb_cache_control ctl;
- struct page *page = NULL;
- int result;
-
- ctl.page = NULL;
- ctl.cache = NULL;
-
- VERBOSE("reading %s/%s, f_pos=%d\n",
- DENTRY_PATH(dentry), (int) filp->f_pos);
-
- result = 0;
-
- lock_kernel();
-
- switch ((unsigned int) filp->f_pos) {
- case 0:
- if (filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR) < 0)
- goto out;
- filp->f_pos = 1;
- /* fallthrough */
- case 1:
- if (filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR) < 0)
- goto out;
- filp->f_pos = 2;
- }
-
- /*
- * Make sure our inode is up-to-date.
- */
- result = smb_revalidate_inode(dentry);
- if (result)
- goto out;
-
-
- page = grab_cache_page(&dir->i_data, 0);
- if (!page)
- goto read_really;
-
- ctl.cache = cache = kmap(page);
- ctl.head = cache->head;
-
- if (!PageUptodate(page) || !ctl.head.eof) {
- VERBOSE("%s/%s, page uptodate=%d, eof=%d\n",
- DENTRY_PATH(dentry), PageUptodate(page),ctl.head.eof);
- goto init_cache;
- }
-
- if (filp->f_pos == 2) {
- if (jiffies - ctl.head.time >= SMB_MAX_AGE(server))
- goto init_cache;
-
- /*
- * N.B. ncpfs checks mtime of dentry too here, we don't.
- * 1. common smb servers do not update mtime on dir changes
- * 2. it requires an extra smb request
- * (revalidate has the same timeout as ctl.head.time)
- *
- * Instead smbfs invalidates its own cache on local changes
- * and remote changes are not seen until timeout.
- */
- }
-
- if (filp->f_pos > ctl.head.end)
- goto finished;
-
- ctl.fpos = filp->f_pos + (SMB_DIRCACHE_START - 2);
- ctl.ofs = ctl.fpos / SMB_DIRCACHE_SIZE;
- ctl.idx = ctl.fpos % SMB_DIRCACHE_SIZE;
-
- for (;;) {
- if (ctl.ofs != 0) {
- ctl.page = find_lock_page(&dir->i_data, ctl.ofs);
- if (!ctl.page)
- goto invalid_cache;
- ctl.cache = kmap(ctl.page);
- if (!PageUptodate(ctl.page))
- goto invalid_cache;
- }
- while (ctl.idx < SMB_DIRCACHE_SIZE) {
- struct dentry *dent;
- int res;
-
- dent = smb_dget_fpos(ctl.cache->dentry[ctl.idx],
- dentry, filp->f_pos);
- if (!dent)
- goto invalid_cache;
-
- res = filldir(dirent, dent->d_name.name,
- dent->d_name.len, filp->f_pos,
- dent->d_inode->i_ino, DT_UNKNOWN);
- dput(dent);
- if (res)
- goto finished;
- filp->f_pos += 1;
- ctl.idx += 1;
- if (filp->f_pos > ctl.head.end)
- goto finished;
- }
- if (ctl.page) {
- kunmap(ctl.page);
- SetPageUptodate(ctl.page);
- unlock_page(ctl.page);
- page_cache_release(ctl.page);
- ctl.page = NULL;
- }
- ctl.idx = 0;
- ctl.ofs += 1;
- }
-invalid_cache:
- if (ctl.page) {
- kunmap(ctl.page);
- unlock_page(ctl.page);
- page_cache_release(ctl.page);
- ctl.page = NULL;
- }
- ctl.cache = cache;
-init_cache:
- smb_invalidate_dircache_entries(dentry);
- ctl.head.time = jiffies;
- ctl.head.eof = 0;
- ctl.fpos = 2;
- ctl.ofs = 0;
- ctl.idx = SMB_DIRCACHE_START;
- ctl.filled = 0;
- ctl.valid = 1;
-read_really:
- result = server->ops->readdir(filp, dirent, filldir, &ctl);
- if (result == -ERESTARTSYS && page)
- ClearPageUptodate(page);
- if (ctl.idx == -1)
- goto invalid_cache; /* retry */
- ctl.head.end = ctl.fpos - 1;
- ctl.head.eof = ctl.valid;
-finished:
- if (page) {
- cache->head = ctl.head;
- kunmap(page);
- if (result != -ERESTARTSYS)
- SetPageUptodate(page);
- unlock_page(page);
- page_cache_release(page);
- }
- if (ctl.page) {
- kunmap(ctl.page);
- SetPageUptodate(ctl.page);
- unlock_page(ctl.page);
- page_cache_release(ctl.page);
- }
-out:
- unlock_kernel();
- return result;
-}
-
-static int
-smb_dir_open(struct inode *dir, struct file *file)
-{
- struct dentry *dentry = file->f_path.dentry;
- struct smb_sb_info *server;
- int error = 0;
-
- VERBOSE("(%s/%s)\n", dentry->d_parent->d_name.name,
- file->f_path.dentry->d_name.name);
-
- /*
- * Directory timestamps in the core protocol aren't updated
- * when a file is added, so we give them a very short TTL.
- */
- lock_kernel();
- server = server_from_dentry(dentry);
- if (server->opt.protocol < SMB_PROTOCOL_LANMAN2) {
- unsigned long age = jiffies - SMB_I(dir)->oldmtime;
- if (age > 2*HZ)
- smb_invalid_dir_cache(dir);
- }
-
- /*
- * Note: in order to allow the smbmount process to open the
- * mount point, we only revalidate if the connection is valid or
- * if the process is trying to access something other than the root.
- */
- if (server->state == CONN_VALID || !IS_ROOT(dentry))
- error = smb_revalidate_inode(dentry);
- unlock_kernel();
- return error;
-}
-
-/*
- * Dentry operations routines
- */
-static int smb_lookup_validate(struct dentry *, struct nameidata *);
-static int smb_hash_dentry(struct dentry *, struct qstr *);
-static int smb_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
-static int smb_delete_dentry(struct dentry *);
-
-static const struct dentry_operations smbfs_dentry_operations =
-{
- .d_revalidate = smb_lookup_validate,
- .d_hash = smb_hash_dentry,
- .d_compare = smb_compare_dentry,
- .d_delete = smb_delete_dentry,
-};
-
-static const struct dentry_operations smbfs_dentry_operations_case =
-{
- .d_revalidate = smb_lookup_validate,
- .d_delete = smb_delete_dentry,
-};
-
-
-/*
- * This is the callback when the dcache has a lookup hit.
- */
-static int
-smb_lookup_validate(struct dentry * dentry, struct nameidata *nd)
-{
- struct smb_sb_info *server = server_from_dentry(dentry);
- struct inode * inode = dentry->d_inode;
- unsigned long age = jiffies - dentry->d_time;
- int valid;
-
- /*
- * The default validation is based on dentry age:
- * we believe in dentries for a few seconds. (But each
- * successful server lookup renews the timestamp.)
- */
- valid = (age <= SMB_MAX_AGE(server));
-#ifdef SMBFS_DEBUG_VERBOSE
- if (!valid)
- VERBOSE("%s/%s not valid, age=%lu\n",
- DENTRY_PATH(dentry), age);
-#endif
-
- if (inode) {
- lock_kernel();
- if (is_bad_inode(inode)) {
- PARANOIA("%s/%s has dud inode\n", DENTRY_PATH(dentry));
- valid = 0;
- } else if (!valid)
- valid = (smb_revalidate_inode(dentry) == 0);
- unlock_kernel();
- } else {
- /*
- * What should we do for negative dentries?
- */
- }
- return valid;
-}
-
-static int
-smb_hash_dentry(struct dentry *dir, struct qstr *this)
-{
- unsigned long hash;
- int i;
-
- hash = init_name_hash();
- for (i=0; i < this->len ; i++)
- hash = partial_name_hash(tolower(this->name[i]), hash);
- this->hash = end_name_hash(hash);
-
- return 0;
-}
-
-static int
-smb_compare_dentry(struct dentry *dir, struct qstr *a, struct qstr *b)
-{
- int i, result = 1;
-
- if (a->len != b->len)
- goto out;
- for (i=0; i < a->len; i++) {
- if (tolower(a->name[i]) != tolower(b->name[i]))
- goto out;
- }
- result = 0;
-out:
- return result;
-}
-
-/*
- * This is the callback from dput() when d_count is going to 0.
- * We use this to unhash dentries with bad inodes.
- */
-static int
-smb_delete_dentry(struct dentry * dentry)
-{
- if (dentry->d_inode) {
- if (is_bad_inode(dentry->d_inode)) {
- PARANOIA("bad inode, unhashing %s/%s\n",
- DENTRY_PATH(dentry));
- return 1;
- }
- } else {
- /* N.B. Unhash negative dentries? */
- }
- return 0;
-}
-
-/*
- * Initialize a new dentry
- */
-void
-smb_new_dentry(struct dentry *dentry)
-{
- struct smb_sb_info *server = server_from_dentry(dentry);
-
- if (server->mnt->flags & SMB_MOUNT_CASE)
- dentry->d_op = &smbfs_dentry_operations_case;
- else
- dentry->d_op = &smbfs_dentry_operations;
- dentry->d_time = jiffies;
-}
-
-
-/*
- * Whenever a lookup succeeds, we know the parent directories
- * are all valid, so we want to update the dentry timestamps.
- * N.B. Move this to dcache?
- */
-void
-smb_renew_times(struct dentry * dentry)
-{
- dget(dentry);
- spin_lock(&dentry->d_lock);
- for (;;) {
- struct dentry *parent;
-
- dentry->d_time = jiffies;
- if (IS_ROOT(dentry))
- break;
- parent = dentry->d_parent;
- dget(parent);
- spin_unlock(&dentry->d_lock);
- dput(dentry);
- dentry = parent;
- spin_lock(&dentry->d_lock);
- }
- spin_unlock(&dentry->d_lock);
- dput(dentry);
-}
-
-static struct dentry *
-smb_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
-{
- struct smb_fattr finfo;
- struct inode *inode;
- int error;
- struct smb_sb_info *server;
-
- error = -ENAMETOOLONG;
- if (dentry->d_name.len > SMB_MAXNAMELEN)
- goto out;
-
- /* Do not allow lookup of names with backslashes in */
- error = -EINVAL;
- if (memchr(dentry->d_name.name, '\\', dentry->d_name.len))
- goto out;
-
- lock_kernel();
- error = smb_proc_getattr(dentry, &finfo);
-#ifdef SMBFS_PARANOIA
- if (error && error != -ENOENT)
- PARANOIA("find %s/%s failed, error=%d\n",
- DENTRY_PATH(dentry), error);
-#endif
-
- inode = NULL;
- if (error == -ENOENT)
- goto add_entry;
- if (!error) {
- error = -EACCES;
- finfo.f_ino = iunique(dentry->d_sb, 2);
- inode = smb_iget(dir->i_sb, &finfo);
- if (inode) {
- add_entry:
- server = server_from_dentry(dentry);
- if (server->mnt->flags & SMB_MOUNT_CASE)
- dentry->d_op = &smbfs_dentry_operations_case;
- else
- dentry->d_op = &smbfs_dentry_operations;
-
- d_add(dentry, inode);
- smb_renew_times(dentry);
- error = 0;
- }
- }
- unlock_kernel();
-out:
- return ERR_PTR(error);
-}
-
-/*
- * This code is common to all routines creating a new inode.
- */
-static int
-smb_instantiate(struct dentry *dentry, __u16 fileid, int have_id)
-{
- struct smb_sb_info *server = server_from_dentry(dentry);
- struct inode *inode;
- int error;
- struct smb_fattr fattr;
-
- VERBOSE("file %s/%s, fileid=%u\n", DENTRY_PATH(dentry), fileid);
-
- error = smb_proc_getattr(dentry, &fattr);
- if (error)
- goto out_close;
-
- smb_renew_times(dentry);
- fattr.f_ino = iunique(dentry->d_sb, 2);
- inode = smb_iget(dentry->d_sb, &fattr);
- if (!inode)
- goto out_no_inode;
-
- if (have_id) {
- struct smb_inode_info *ei = SMB_I(inode);
- ei->fileid = fileid;
- ei->access = SMB_O_RDWR;
- ei->open = server->generation;
- }
- d_instantiate(dentry, inode);
-out:
- return error;
-
-out_no_inode:
- error = -EACCES;
-out_close:
- if (have_id) {
- PARANOIA("%s/%s failed, error=%d, closing %u\n",
- DENTRY_PATH(dentry), error, fileid);
- smb_close_fileid(dentry, fileid);
- }
- goto out;
-}
-
-/* N.B. How should the mode argument be used? */
-static int
-smb_create(struct inode *dir, struct dentry *dentry, int mode,
- struct nameidata *nd)
-{
- struct smb_sb_info *server = server_from_dentry(dentry);
- __u16 fileid;
- int error;
- 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;
-}
projects / linux-2.6-microblaze.git / blobdiff