diff options
Diffstat (limited to 'fs/cifs/dir.c')
| -rw-r--r-- | fs/cifs/dir.c | 864 |
1 files changed, 0 insertions, 864 deletions
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c deleted file mode 100644 index d62ce0d48141..000000000000 --- a/fs/cifs/dir.c +++ /dev/null @@ -1,864 +0,0 @@ -/* - * 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" - -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 *created) -{ - 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, - }; - - *created |= FILE_CREATED; - 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->netfid); - 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: %s and dentry = 0x%p\n", - inode, direntry->d_name.name, 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, opened); - - if (rc) { - cifs_del_pending_open(&open); - goto out; - } - - 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; - } - - 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; - int created = FILE_CREATED; - - cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %s and dentry = 0x%p\n", - inode, direntry->d_name.name, 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, &created); - 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 *pTcon; - struct cifs_io_parms io_parms; - char *full_path = NULL; - struct inode *newinode = NULL; - int oplock = 0; - u16 fileHandle; - FILE_ALL_INFO *buf = NULL; - unsigned int bytes_written; - struct win_dev *pdev; - - 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); - - pTcon = tlink_tcon(tlink); - - xid = get_xid(); - - full_path = build_path_from_dentry(direntry); - if (full_path == NULL) { - rc = -ENOMEM; - goto mknod_out; - } - - if (pTcon->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, pTcon, full_path, &args, - cifs_sb->local_nls, - cifs_sb->mnt_cifs_flags & - CIFS_MOUNT_MAP_SPECIAL_CHR); - 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; - - rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE, - GENERIC_WRITE, create_options, - &fileHandle, &oplock, buf, cifs_sb->local_nls, - cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); - 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.netfid = fileHandle; - io_parms.pid = current->tgid; - io_parms.tcon = pTcon; - io_parms.offset = 0; - io_parms.length = 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 = CIFSSMBWrite(xid, &io_parms, - &bytes_written, (char *)pdev, - NULL, 0); - } 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 = CIFSSMBWrite(xid, &io_parms, - &bytes_written, (char *)pdev, - NULL, 0); - } /* else if (S_ISFIFO) */ - CIFSSMBClose(xid, pTcon, fileHandle); - 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: %s and dentry = 0x%p\n", - parent_dir_inode, direntry->d_name.name, 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 (direntry->d_inode != NULL) { - 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, direntry->d_inode); - - 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(VFS, "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 (direntry->d_inode) { - 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(direntry->d_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, 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 = %s\n", direntry->d_name.name); - - 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; - int i; - - hash = init_name_hash(); - for (i = 0; i < q->len; i++) - hash = partial_name_hash(nls_tolower(codepage, q->name[i]), - 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; - - if ((name->len == len) && - (nls_strnicmp(codepage, name->name, str, len) == 0)) - return 0; - return 1; -} - -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, -}; |