| /* |
| * fs/cifs/dir.c |
| * |
| * vfs operations that deal with dentries |
| * |
| * Copyright (C) International Business Machines Corp., 2002,2009 |
| * Author(s): Steve French (sfrench@us.ibm.com) |
| * |
| * This library is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as published |
| * by the Free Software Foundation; either version 2.1 of the License, or |
| * (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include <linux/fs.h> |
| #include <linux/stat.h> |
| #include <linux/slab.h> |
| #include <linux/namei.h> |
| #include <linux/mount.h> |
| #include <linux/file.h> |
| #include "cifsfs.h" |
| #include "cifspdu.h" |
| #include "cifsglob.h" |
| #include "cifsproto.h" |
| #include "cifs_debug.h" |
| #include "cifs_fs_sb.h" |
| #include "cifs_unicode.h" |
| #include "fs_context.h" |
| |
| static void |
| renew_parental_timestamps(struct dentry *direntry) |
| { |
| /* BB check if there is a way to get the kernel to do this or if we |
| really need this */ |
| do { |
| cifs_set_time(direntry, jiffies); |
| direntry = direntry->d_parent; |
| } while (!IS_ROOT(direntry)); |
| } |
| |
| char * |
| cifs_build_path_to_root(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb, |
| struct cifs_tcon *tcon, int add_treename) |
| { |
| int pplen = ctx->prepath ? strlen(ctx->prepath) + 1 : 0; |
| int dfsplen; |
| char *full_path = NULL; |
| |
| /* if no prefix path, simply set path to the root of share to "" */ |
| if (pplen == 0) { |
| full_path = kzalloc(1, GFP_KERNEL); |
| return full_path; |
| } |
| |
| if (add_treename) |
| dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1); |
| else |
| dfsplen = 0; |
| |
| full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL); |
| if (full_path == NULL) |
| return full_path; |
| |
| if (dfsplen) |
| memcpy(full_path, tcon->treeName, dfsplen); |
| full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb); |
| memcpy(full_path + dfsplen + 1, ctx->prepath, pplen); |
| convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb)); |
| return full_path; |
| } |
| |
| /* Note: caller must free return buffer */ |
| char * |
| build_path_from_dentry(struct dentry *direntry) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); |
| struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS; |
| |
| return build_path_from_dentry_optional_prefix(direntry, |
| prefix); |
| } |
| |
| char * |
| build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix) |
| { |
| struct dentry *temp; |
| int namelen; |
| int dfsplen; |
| int pplen = 0; |
| char *full_path; |
| char dirsep; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); |
| struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| unsigned seq; |
| |
| dirsep = CIFS_DIR_SEP(cifs_sb); |
| if (prefix) |
| dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1); |
| else |
| dfsplen = 0; |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) |
| pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0; |
| |
| cifs_bp_rename_retry: |
| namelen = dfsplen + pplen; |
| seq = read_seqbegin(&rename_lock); |
| rcu_read_lock(); |
| for (temp = direntry; !IS_ROOT(temp);) { |
| namelen += (1 + temp->d_name.len); |
| temp = temp->d_parent; |
| if (temp == NULL) { |
| cifs_dbg(VFS, "corrupt dentry\n"); |
| rcu_read_unlock(); |
| return NULL; |
| } |
| } |
| rcu_read_unlock(); |
| |
| full_path = kmalloc(namelen+1, GFP_ATOMIC); |
| if (full_path == NULL) |
| return full_path; |
| full_path[namelen] = 0; /* trailing null */ |
| rcu_read_lock(); |
| for (temp = direntry; !IS_ROOT(temp);) { |
| spin_lock(&temp->d_lock); |
| namelen -= 1 + temp->d_name.len; |
| if (namelen < 0) { |
| spin_unlock(&temp->d_lock); |
| break; |
| } else { |
| full_path[namelen] = dirsep; |
| strncpy(full_path + namelen + 1, temp->d_name.name, |
| temp->d_name.len); |
| cifs_dbg(FYI, "name: %s\n", full_path + namelen); |
| } |
| spin_unlock(&temp->d_lock); |
| temp = temp->d_parent; |
| if (temp == NULL) { |
| cifs_dbg(VFS, "corrupt dentry\n"); |
| rcu_read_unlock(); |
| kfree(full_path); |
| return NULL; |
| } |
| } |
| rcu_read_unlock(); |
| if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) { |
| cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n", |
| namelen, dfsplen); |
| /* presumably this is only possible if racing with a rename |
| of one of the parent directories (we can not lock the dentries |
| above us to prevent this, but retrying should be harmless) */ |
| kfree(full_path); |
| goto cifs_bp_rename_retry; |
| } |
| /* DIR_SEP already set for byte 0 / vs \ but not for |
| subsequent slashes in prepath which currently must |
| be entered the right way - not sure if there is an alternative |
| since the '\' is a valid posix character so we can not switch |
| those safely to '/' if any are found in the middle of the prepath */ |
| /* BB test paths to Windows with '/' in the midst of prepath */ |
| |
| if (pplen) { |
| int i; |
| |
| cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath); |
| memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1); |
| full_path[dfsplen] = dirsep; |
| for (i = 0; i < pplen-1; i++) |
| if (full_path[dfsplen+1+i] == '/') |
| full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb); |
| } |
| |
| if (dfsplen) { |
| strncpy(full_path, tcon->treeName, dfsplen); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) { |
| int i; |
| for (i = 0; i < dfsplen; i++) { |
| if (full_path[i] == '\\') |
| full_path[i] = '/'; |
| } |
| } |
| } |
| return full_path; |
| } |
| |
| /* |
| * Don't allow path components longer than the server max. |
| * Don't allow the separator character in a path component. |
| * The VFS will not allow "/", but "\" is allowed by posix. |
| */ |
| static int |
| check_name(struct dentry *direntry, struct cifs_tcon *tcon) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); |
| int i; |
| |
| if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength && |
| direntry->d_name.len > |
| le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength))) |
| return -ENAMETOOLONG; |
| |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) { |
| for (i = 0; i < direntry->d_name.len; i++) { |
| if (direntry->d_name.name[i] == '\\') { |
| cifs_dbg(FYI, "Invalid file name\n"); |
| return -EINVAL; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| |
| /* Inode operations in similar order to how they appear in Linux file fs.h */ |
| |
| static int |
| cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid, |
| struct tcon_link *tlink, unsigned oflags, umode_t mode, |
| __u32 *oplock, struct cifs_fid *fid) |
| { |
| int rc = -ENOENT; |
| int create_options = CREATE_NOT_DIR; |
| int desired_access; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifs_tcon *tcon = tlink_tcon(tlink); |
| char *full_path = NULL; |
| FILE_ALL_INFO *buf = NULL; |
| struct inode *newinode = NULL; |
| int disposition; |
| struct TCP_Server_Info *server = tcon->ses->server; |
| struct cifs_open_parms oparms; |
| |
| *oplock = 0; |
| if (tcon->ses->server->oplocks) |
| *oplock = REQ_OPLOCK; |
| |
| full_path = build_path_from_dentry(direntry); |
| if (!full_path) |
| return -ENOMEM; |
| |
| if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open && |
| (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
| rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode, |
| oflags, oplock, &fid->netfid, xid); |
| switch (rc) { |
| case 0: |
| if (newinode == NULL) { |
| /* query inode info */ |
| goto cifs_create_get_file_info; |
| } |
| |
| if (S_ISDIR(newinode->i_mode)) { |
| CIFSSMBClose(xid, tcon, fid->netfid); |
| iput(newinode); |
| rc = -EISDIR; |
| goto out; |
| } |
| |
| if (!S_ISREG(newinode->i_mode)) { |
| /* |
| * The server may allow us to open things like |
| * FIFOs, but the client isn't set up to deal |
| * with that. If it's not a regular file, just |
| * close it and proceed as if it were a normal |
| * lookup. |
| */ |
| CIFSSMBClose(xid, tcon, fid->netfid); |
| goto cifs_create_get_file_info; |
| } |
| /* success, no need to query */ |
| goto cifs_create_set_dentry; |
| |
| case -ENOENT: |
| goto cifs_create_get_file_info; |
| |
| case -EIO: |
| case -EINVAL: |
| /* |
| * EIO could indicate that (posix open) operation is not |
| * supported, despite what server claimed in capability |
| * negotiation. |
| * |
| * POSIX open in samba versions 3.3.1 and earlier could |
| * incorrectly fail with invalid parameter. |
| */ |
| tcon->broken_posix_open = true; |
| break; |
| |
| case -EREMOTE: |
| case -EOPNOTSUPP: |
| /* |
| * EREMOTE indicates DFS junction, which is not handled |
| * in posix open. If either that or op not supported |
| * returned, follow the normal lookup. |
| */ |
| break; |
| |
| default: |
| goto out; |
| } |
| /* |
| * fallthrough to retry, using older open call, this is case |
| * where server does not support this SMB level, and falsely |
| * claims capability (also get here for DFS case which should be |
| * rare for path not covered on files) |
| */ |
| } |
| |
| desired_access = 0; |
| if (OPEN_FMODE(oflags) & FMODE_READ) |
| desired_access |= GENERIC_READ; /* is this too little? */ |
| if (OPEN_FMODE(oflags) & FMODE_WRITE) |
| desired_access |= GENERIC_WRITE; |
| |
| disposition = FILE_OVERWRITE_IF; |
| if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
| disposition = FILE_CREATE; |
| else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) |
| disposition = FILE_OVERWRITE_IF; |
| else if ((oflags & O_CREAT) == O_CREAT) |
| disposition = FILE_OPEN_IF; |
| else |
| cifs_dbg(FYI, "Create flag not set in create function\n"); |
| |
| /* |
| * BB add processing to set equivalent of mode - e.g. via CreateX with |
| * ACLs |
| */ |
| |
| if (!server->ops->open) { |
| rc = -ENOSYS; |
| goto out; |
| } |
| |
| buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
| if (buf == NULL) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| /* |
| * if we're not using unix extensions, see if we need to set |
| * ATTR_READONLY on the create call |
| */ |
| if (!tcon->unix_ext && (mode & S_IWUGO) == 0) |
| create_options |= CREATE_OPTION_READONLY; |
| |
| oparms.tcon = tcon; |
| oparms.cifs_sb = cifs_sb; |
| oparms.desired_access = desired_access; |
| oparms.create_options = cifs_create_options(cifs_sb, create_options); |
| oparms.disposition = disposition; |
| oparms.path = full_path; |
| oparms.fid = fid; |
| oparms.reconnect = false; |
| oparms.mode = mode; |
| rc = server->ops->open(xid, &oparms, oplock, buf); |
| if (rc) { |
| cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc); |
| goto out; |
| } |
| |
| /* |
| * If Open reported that we actually created a file then we now have to |
| * set the mode if possible. |
| */ |
| if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) { |
| struct cifs_unix_set_info_args args = { |
| .mode = mode, |
| .ctime = NO_CHANGE_64, |
| .atime = NO_CHANGE_64, |
| .mtime = NO_CHANGE_64, |
| .device = 0, |
| }; |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { |
| args.uid = current_fsuid(); |
| if (inode->i_mode & S_ISGID) |
| args.gid = inode->i_gid; |
| else |
| args.gid = current_fsgid(); |
| } else { |
| args.uid = INVALID_UID; /* no change */ |
| args.gid = INVALID_GID; /* no change */ |
| } |
| CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid, |
| current->tgid); |
| } else { |
| /* |
| * BB implement mode setting via Windows security |
| * descriptors e.g. |
| */ |
| /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/ |
| |
| /* Could set r/o dos attribute if mode & 0222 == 0 */ |
| } |
| |
| cifs_create_get_file_info: |
| /* server might mask mode so we have to query for it */ |
| if (tcon->unix_ext) |
| rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb, |
| xid); |
| else { |
| /* TODO: Add support for calling POSIX query info here, but passing in fid */ |
| rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb, |
| xid, fid); |
| if (newinode) { |
| if (server->ops->set_lease_key) |
| server->ops->set_lease_key(newinode, fid); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) |
| newinode->i_mode = mode; |
| if ((*oplock & CIFS_CREATE_ACTION) && |
| (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) { |
| newinode->i_uid = current_fsuid(); |
| if (inode->i_mode & S_ISGID) |
| newinode->i_gid = inode->i_gid; |
| else |
| newinode->i_gid = current_fsgid(); |
| } |
| } |
| } |
| |
| cifs_create_set_dentry: |
| if (rc != 0) { |
| cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n", |
| rc); |
| goto out_err; |
| } |
| |
| if (S_ISDIR(newinode->i_mode)) { |
| rc = -EISDIR; |
| goto out_err; |
| } |
| |
| d_drop(direntry); |
| d_add(direntry, newinode); |
| |
| out: |
| kfree(buf); |
| kfree(full_path); |
| return rc; |
| |
| out_err: |
| if (server->ops->close) |
| server->ops->close(xid, tcon, fid); |
| if (newinode) |
| iput(newinode); |
| goto out; |
| } |
| |
| int |
| cifs_atomic_open(struct inode *inode, struct dentry *direntry, |
| struct file *file, unsigned oflags, umode_t mode) |
| { |
| int rc; |
| unsigned int xid; |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| struct cifs_fid fid; |
| struct cifs_pending_open open; |
| __u32 oplock; |
| struct cifsFileInfo *file_info; |
| |
| /* |
| * Posix open is only called (at lookup time) for file create now. For |
| * opens (rather than creates), because we do not know if it is a file |
| * or directory yet, and current Samba no longer allows us to do posix |
| * open on dirs, we could end up wasting an open call on what turns out |
| * to be a dir. For file opens, we wait to call posix open till |
| * cifs_open. It could be added to atomic_open in the future but the |
| * performance tradeoff of the extra network request when EISDIR or |
| * EACCES is returned would have to be weighed against the 50% reduction |
| * in network traffic in the other paths. |
| */ |
| if (!(oflags & O_CREAT)) { |
| struct dentry *res; |
| |
| /* |
| * Check for hashed negative dentry. We have already revalidated |
| * the dentry and it is fine. No need to perform another lookup. |
| */ |
| if (!d_in_lookup(direntry)) |
| return -ENOENT; |
| |
| res = cifs_lookup(inode, direntry, 0); |
| if (IS_ERR(res)) |
| return PTR_ERR(res); |
| |
| return finish_no_open(file, res); |
| } |
| |
| xid = get_xid(); |
| |
| cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n", |
| inode, direntry, direntry); |
| |
| tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb)); |
| if (IS_ERR(tlink)) { |
| rc = PTR_ERR(tlink); |
| goto out_free_xid; |
| } |
| |
| tcon = tlink_tcon(tlink); |
| |
| rc = check_name(direntry, tcon); |
| if (rc) |
| goto out; |
| |
| server = tcon->ses->server; |
| |
| if (server->ops->new_lease_key) |
| server->ops->new_lease_key(&fid); |
| |
| cifs_add_pending_open(&fid, tlink, &open); |
| |
| rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode, |
| &oplock, &fid); |
| |
| if (rc) { |
| cifs_del_pending_open(&open); |
| goto out; |
| } |
| |
| if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
| file->f_mode |= FMODE_CREATED; |
| |
| rc = finish_open(file, direntry, generic_file_open); |
| if (rc) { |
| if (server->ops->close) |
| server->ops->close(xid, tcon, &fid); |
| cifs_del_pending_open(&open); |
| goto out; |
| } |
| |
| if (file->f_flags & O_DIRECT && |
| CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { |
| if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| file->f_op = &cifs_file_direct_nobrl_ops; |
| else |
| file->f_op = &cifs_file_direct_ops; |
| } |
| |
| file_info = cifs_new_fileinfo(&fid, file, tlink, oplock); |
| if (file_info == NULL) { |
| if (server->ops->close) |
| server->ops->close(xid, tcon, &fid); |
| cifs_del_pending_open(&open); |
| rc = -ENOMEM; |
| } |
| |
| out: |
| cifs_put_tlink(tlink); |
| out_free_xid: |
| free_xid(xid); |
| return rc; |
| } |
| |
| int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode, |
| bool excl) |
| { |
| int rc; |
| unsigned int xid = get_xid(); |
| /* |
| * BB below access is probably too much for mknod to request |
| * but we have to do query and setpathinfo so requesting |
| * less could fail (unless we want to request getatr and setatr |
| * permissions (only). At least for POSIX we do not have to |
| * request so much. |
| */ |
| unsigned oflags = O_EXCL | O_CREAT | O_RDWR; |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| struct cifs_fid fid; |
| __u32 oplock; |
| |
| cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n", |
| inode, direntry, direntry); |
| |
| tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb)); |
| rc = PTR_ERR(tlink); |
| if (IS_ERR(tlink)) |
| goto out_free_xid; |
| |
| tcon = tlink_tcon(tlink); |
| server = tcon->ses->server; |
| |
| if (server->ops->new_lease_key) |
| server->ops->new_lease_key(&fid); |
| |
| rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode, |
| &oplock, &fid); |
| if (!rc && server->ops->close) |
| server->ops->close(xid, tcon, &fid); |
| |
| cifs_put_tlink(tlink); |
| out_free_xid: |
| free_xid(xid); |
| return rc; |
| } |
| |
| int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode, |
| dev_t device_number) |
| { |
| int rc = -EPERM; |
| unsigned int xid; |
| struct cifs_sb_info *cifs_sb; |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| char *full_path = NULL; |
| |
| if (!old_valid_dev(device_number)) |
| return -EINVAL; |
| |
| cifs_sb = CIFS_SB(inode->i_sb); |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| |
| tcon = tlink_tcon(tlink); |
| |
| xid = get_xid(); |
| |
| full_path = build_path_from_dentry(direntry); |
| if (full_path == NULL) { |
| rc = -ENOMEM; |
| goto mknod_out; |
| } |
| |
| rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon, |
| full_path, mode, |
| device_number); |
| |
| mknod_out: |
| kfree(full_path); |
| free_xid(xid); |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| struct dentry * |
| cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, |
| unsigned int flags) |
| { |
| unsigned int xid; |
| int rc = 0; /* to get around spurious gcc warning, set to zero here */ |
| struct cifs_sb_info *cifs_sb; |
| struct tcon_link *tlink; |
| struct cifs_tcon *pTcon; |
| struct inode *newInode = NULL; |
| char *full_path = NULL; |
| |
| xid = get_xid(); |
| |
| cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n", |
| parent_dir_inode, direntry, direntry); |
| |
| /* check whether path exists */ |
| |
| cifs_sb = CIFS_SB(parent_dir_inode->i_sb); |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) { |
| free_xid(xid); |
| return ERR_CAST(tlink); |
| } |
| pTcon = tlink_tcon(tlink); |
| |
| rc = check_name(direntry, pTcon); |
| if (unlikely(rc)) { |
| cifs_put_tlink(tlink); |
| free_xid(xid); |
| return ERR_PTR(rc); |
| } |
| |
| /* can not grab the rename sem here since it would |
| deadlock in the cases (beginning of sys_rename itself) |
| in which we already have the sb rename sem */ |
| full_path = build_path_from_dentry(direntry); |
| if (full_path == NULL) { |
| cifs_put_tlink(tlink); |
| free_xid(xid); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| if (d_really_is_positive(direntry)) { |
| cifs_dbg(FYI, "non-NULL inode in lookup\n"); |
| } else { |
| cifs_dbg(FYI, "NULL inode in lookup\n"); |
| } |
| cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", |
| full_path, d_inode(direntry)); |
| |
| if (pTcon->posix_extensions) |
| rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid); |
| else if (pTcon->unix_ext) { |
| rc = cifs_get_inode_info_unix(&newInode, full_path, |
| parent_dir_inode->i_sb, xid); |
| } else { |
| rc = cifs_get_inode_info(&newInode, full_path, NULL, |
| parent_dir_inode->i_sb, xid, NULL); |
| } |
| |
| if (rc == 0) { |
| /* since paths are not looked up by component - the parent |
| directories are presumed to be good here */ |
| renew_parental_timestamps(direntry); |
| } else if (rc == -ENOENT) { |
| cifs_set_time(direntry, jiffies); |
| newInode = NULL; |
| } else { |
| if (rc != -EACCES) { |
| cifs_dbg(FYI, "Unexpected lookup error %d\n", rc); |
| /* We special case check for Access Denied - since that |
| is a common return code */ |
| } |
| newInode = ERR_PTR(rc); |
| } |
| kfree(full_path); |
| cifs_put_tlink(tlink); |
| free_xid(xid); |
| return d_splice_alias(newInode, direntry); |
| } |
| |
| static int |
| cifs_d_revalidate(struct dentry *direntry, unsigned int flags) |
| { |
| struct inode *inode; |
| int rc; |
| |
| if (flags & LOOKUP_RCU) |
| return -ECHILD; |
| |
| if (d_really_is_positive(direntry)) { |
| inode = d_inode(direntry); |
| if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode))) |
| CIFS_I(inode)->time = 0; /* force reval */ |
| |
| rc = cifs_revalidate_dentry(direntry); |
| if (rc) { |
| cifs_dbg(FYI, "cifs_revalidate_dentry failed with rc=%d", rc); |
| switch (rc) { |
| case -ENOENT: |
| case -ESTALE: |
| /* |
| * Those errors mean the dentry is invalid |
| * (file was deleted or recreated) |
| */ |
| return 0; |
| default: |
| /* |
| * Otherwise some unexpected error happened |
| * report it as-is to VFS layer |
| */ |
| return rc; |
| } |
| } |
| else { |
| /* |
| * If the inode wasn't known to be a dfs entry when |
| * the dentry was instantiated, such as when created |
| * via ->readdir(), it needs to be set now since the |
| * attributes will have been updated by |
| * cifs_revalidate_dentry(). |
| */ |
| if (IS_AUTOMOUNT(inode) && |
| !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) { |
| spin_lock(&direntry->d_lock); |
| direntry->d_flags |= DCACHE_NEED_AUTOMOUNT; |
| spin_unlock(&direntry->d_lock); |
| } |
| |
| return 1; |
| } |
| } |
| |
| /* |
| * This may be nfsd (or something), anyway, we can't see the |
| * intent of this. So, since this can be for creation, drop it. |
| */ |
| if (!flags) |
| return 0; |
| |
| /* |
| * Drop the negative dentry, in order to make sure to use the |
| * case sensitive name which is specified by user if this is |
| * for creation. |
| */ |
| if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
| return 0; |
| |
| if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled) |
| return 0; |
| |
| return 1; |
| } |
| |
| /* static int cifs_d_delete(struct dentry *direntry) |
| { |
| int rc = 0; |
| |
| cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry); |
| |
| return rc; |
| } */ |
| |
| const struct dentry_operations cifs_dentry_ops = { |
| .d_revalidate = cifs_d_revalidate, |
| .d_automount = cifs_dfs_d_automount, |
| /* d_delete: cifs_d_delete, */ /* not needed except for debugging */ |
| }; |
| |
| static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q) |
| { |
| struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls; |
| unsigned long hash; |
| wchar_t c; |
| int i, charlen; |
| |
| hash = init_name_hash(dentry); |
| for (i = 0; i < q->len; i += charlen) { |
| charlen = codepage->char2uni(&q->name[i], q->len - i, &c); |
| /* error out if we can't convert the character */ |
| if (unlikely(charlen < 0)) |
| return charlen; |
| hash = partial_name_hash(cifs_toupper(c), hash); |
| } |
| q->hash = end_name_hash(hash); |
| |
| return 0; |
| } |
| |
| static int cifs_ci_compare(const struct dentry *dentry, |
| unsigned int len, const char *str, const struct qstr *name) |
| { |
| struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls; |
| wchar_t c1, c2; |
| int i, l1, l2; |
| |
| /* |
| * We make the assumption here that uppercase characters in the local |
| * codepage are always the same length as their lowercase counterparts. |
| * |
| * If that's ever not the case, then this will fail to match it. |
| */ |
| if (name->len != len) |
| return 1; |
| |
| for (i = 0; i < len; i += l1) { |
| /* Convert characters in both strings to UTF-16. */ |
| l1 = codepage->char2uni(&str[i], len - i, &c1); |
| l2 = codepage->char2uni(&name->name[i], name->len - i, &c2); |
| |
| /* |
| * If we can't convert either character, just declare it to |
| * be 1 byte long and compare the original byte. |
| */ |
| if (unlikely(l1 < 0 && l2 < 0)) { |
| if (str[i] != name->name[i]) |
| return 1; |
| l1 = 1; |
| continue; |
| } |
| |
| /* |
| * Here, we again ass|u|me that upper/lowercase versions of |
| * a character are the same length in the local NLS. |
| */ |
| if (l1 != l2) |
| return 1; |
| |
| /* Now compare uppercase versions of these characters */ |
| if (cifs_toupper(c1) != cifs_toupper(c2)) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| const struct dentry_operations cifs_ci_dentry_ops = { |
| .d_revalidate = cifs_d_revalidate, |
| .d_hash = cifs_ci_hash, |
| .d_compare = cifs_ci_compare, |
| .d_automount = cifs_dfs_d_automount, |
| }; |