diff options
Diffstat (limited to 'fs/cifs/dir.c')
| -rw-r--r-- | fs/cifs/dir.c | 924 |
1 files changed, 924 insertions, 0 deletions
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c new file mode 100644 index 000000000..c3eb998a9 --- /dev/null +++ b/fs/cifs/dir.c @@ -0,0 +1,924 @@ +/* + * 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" + +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 { + direntry->d_time = jiffies; + direntry = direntry->d_parent; + } while (!IS_ROOT(direntry)); +} + +char * +cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb, + struct cifs_tcon *tcon) +{ + int pplen = vol->prepath ? strlen(vol->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 (tcon->Flags & SMB_SHARE_IS_IN_DFS) + 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) + strncpy(full_path, tcon->treeName, dfsplen); + full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb); + strncpy(full_path + dfsplen + 1, vol->prepath, pplen); + convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb)); + full_path[dfsplen + pplen] = 0; /* add trailing null */ + return full_path; +} + +/* Note: caller must free return buffer */ +char * +build_path_from_dentry(struct dentry *direntry) +{ + struct dentry *temp; + int namelen; + int dfsplen; + 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 (tcon->Flags & SMB_SHARE_IS_IN_DFS) + dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1); + else + dfsplen = 0; +cifs_bp_rename_retry: + namelen = dfsplen; + 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_KERNEL); + 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 || 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 (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 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_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); + int i; + + 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 == NULL) { + rc = -ENOMEM; + goto out; + } + + 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_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; + + if (backup_cred(cifs_sb)) + create_options |= CREATE_OPEN_BACKUP_INTENT; + + oparms.tcon = tcon; + oparms.cifs_sb = cifs_sb; + oparms.desired_access = desired_access; + oparms.create_options = create_options; + oparms.disposition = disposition; + oparms.path = full_path; + oparms.fid = fid; + oparms.reconnect = false; + + 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 { + 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); + if (server->ops->close) + server->ops->close(xid, tcon, fid); + goto out; + } + d_drop(direntry); + d_add(direntry, newinode); + +out: + kfree(buf); + kfree(full_path); + return rc; +} + +int +cifs_atomic_open(struct inode *inode, struct dentry *direntry, + struct file *file, unsigned oflags, umode_t mode, + int *opened) +{ + 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_unhashed(direntry)) + return -ENOENT; + + res = cifs_lookup(inode, direntry, 0); + if (IS_ERR(res)) + return PTR_ERR(res); + + return finish_no_open(file, res); + } + + rc = check_name(direntry); + if (rc) + return rc; + + 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); + 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)) + *opened |= FILE_CREATED; + + rc = finish_open(file, direntry, generic_file_open, opened); + 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); + fput(file); + 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; + int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL; + struct cifs_sb_info *cifs_sb; + struct tcon_link *tlink; + struct cifs_tcon *tcon; + struct cifs_io_parms io_parms; + char *full_path = NULL; + struct inode *newinode = NULL; + __u32 oplock = 0; + struct cifs_fid fid; + struct cifs_open_parms oparms; + FILE_ALL_INFO *buf = NULL; + unsigned int bytes_written; + struct win_dev *pdev; + struct kvec iov[2]; + + 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; + } + + if (tcon->unix_ext) { + struct cifs_unix_set_info_args args = { + .mode = mode & ~current_umask(), + .ctime = NO_CHANGE_64, + .atime = NO_CHANGE_64, + .mtime = NO_CHANGE_64, + .device = device_number, + }; + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { + args.uid = current_fsuid(); + args.gid = current_fsgid(); + } else { + args.uid = INVALID_UID; /* no change */ + args.gid = INVALID_GID; /* no change */ + } + rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, + cifs_sb->local_nls, + cifs_remap(cifs_sb)); + if (rc) + goto mknod_out; + + rc = cifs_get_inode_info_unix(&newinode, full_path, + inode->i_sb, xid); + + if (rc == 0) + d_instantiate(direntry, newinode); + goto mknod_out; + } + + if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) + goto mknod_out; + + + cifs_dbg(FYI, "sfu compat create special file\n"); + + buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); + if (buf == NULL) { + kfree(full_path); + rc = -ENOMEM; + free_xid(xid); + return rc; + } + + if (backup_cred(cifs_sb)) + create_options |= CREATE_OPEN_BACKUP_INTENT; + + oparms.tcon = tcon; + oparms.cifs_sb = cifs_sb; + oparms.desired_access = GENERIC_WRITE; + oparms.create_options = create_options; + oparms.disposition = FILE_CREATE; + oparms.path = full_path; + oparms.fid = &fid; + oparms.reconnect = false; + + if (tcon->ses->server->oplocks) + oplock = REQ_OPLOCK; + else + oplock = 0; + rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf); + if (rc) + goto mknod_out; + + /* + * BB Do not bother to decode buf since no local inode yet to put + * timestamps in, but we can reuse it safely. + */ + + pdev = (struct win_dev *)buf; + io_parms.pid = current->tgid; + io_parms.tcon = tcon; + io_parms.offset = 0; + io_parms.length = sizeof(struct win_dev); + iov[1].iov_base = buf; + iov[1].iov_len = sizeof(struct win_dev); + if (S_ISCHR(mode)) { + memcpy(pdev->type, "IntxCHR", 8); + pdev->major = cpu_to_le64(MAJOR(device_number)); + pdev->minor = cpu_to_le64(MINOR(device_number)); + rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms, + &bytes_written, iov, 1); + } else if (S_ISBLK(mode)) { + memcpy(pdev->type, "IntxBLK", 8); + pdev->major = cpu_to_le64(MAJOR(device_number)); + pdev->minor = cpu_to_le64(MINOR(device_number)); + rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms, + &bytes_written, iov, 1); + } /* else if (S_ISFIFO) */ + tcon->ses->server->ops->close(xid, tcon, &fid); + d_drop(direntry); + + /* FIXME: add code here to set EAs */ + +mknod_out: + kfree(full_path); + kfree(buf); + 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 (struct dentry *)tlink; + } + pTcon = tlink_tcon(tlink); + + rc = check_name(direntry); + if (rc) + goto lookup_out; + + /* 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) { + rc = -ENOMEM; + goto lookup_out; + } + + 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->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) && (newInode != NULL)) { + d_add(direntry, newInode); + /* 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) { + rc = 0; + direntry->d_time = jiffies; + d_add(direntry, NULL); + /* if it was once a directory (but how can we tell?) we could do + shrink_dcache_parent(direntry); */ + } 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 */ + } + +lookup_out: + kfree(full_path); + cifs_put_tlink(tlink); + free_xid(xid); + return ERR_PTR(rc); +} + +static int +cifs_d_revalidate(struct dentry *direntry, unsigned int flags) +{ + if (flags & LOOKUP_RCU) + return -ECHILD; + + if (d_really_is_positive(direntry)) { + if (cifs_revalidate_dentry(direntry)) + return 0; + 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(d_inode(direntry)) && + !(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, direntry->d_time + 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(); + 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 *parent, const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name) +{ + struct nls_table *codepage = CIFS_SB(parent->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, +}; |