/* * 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 = { .read = generic_read_dir, .readdir = smb_readdir, .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; }