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-rw-r--r--fs/cifs/dir.c1059
1 files changed, 697 insertions, 362 deletions
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index fed55e3c53d..3db0c5fd9a1 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -2,8 +2,8 @@
* fs/cifs/dir.c
*
* vfs operations that deal with dentries
- *
- * Copyright (C) International Business Machines Corp., 2002,2005
+ *
+ * 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
@@ -24,21 +24,57 @@
#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"
-void
+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 */
+ /* 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));
+ } 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 */
@@ -46,531 +82,830 @@ char *
build_path_from_dentry(struct dentry *direntry)
{
struct dentry *temp;
- int namelen = 0;
+ int namelen;
+ int dfsplen;
char *full_path;
- char dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
-
- if(direntry == NULL)
- return NULL; /* not much we can do if dentry is freed and
- we need to reopen the file after it was closed implicitly
- when the server crashed */
-
+ 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) {
- cERROR(1,("corrupt dentry"));
+ 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)
+ 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);
- cFYI(0, (" name: %s ", full_path + namelen));
+ cifs_dbg(FYI, "name: %s\n", full_path + namelen);
}
+ spin_unlock(&temp->d_lock);
temp = temp->d_parent;
- if(temp == NULL) {
- cERROR(1,("corrupt dentry"));
+ if (temp == NULL) {
+ cifs_dbg(VFS, "corrupt dentry\n");
+ rcu_read_unlock();
kfree(full_path);
return NULL;
}
}
- if (namelen != 0) {
- cERROR(1,
- ("We did not end path lookup where we expected namelen is %d",
- namelen));
- /* presumably this is only possible if we were racing with a rename
+ 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);
- namelen = 0;
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;
}
-/* char * build_wildcard_path_from_dentry(struct dentry *direntry)
+/*
+ * 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)
{
- if(full_path == NULL)
- return full_path;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+ int i;
- full_path[namelen] = '\\';
- full_path[namelen+1] = '*';
- full_path[namelen+2] = 0;
-BB remove above eight lines BB */
+ 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 the Linux file fs.h */
-int
-cifs_create(struct inode *inode, struct dentry *direntry, int mode,
- struct nameidata *nd)
+/* 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 xid;
- int oplock = 0;
- int desiredAccess = GENERIC_READ | GENERIC_WRITE;
- __u16 fileHandle;
- struct cifs_sb_info *cifs_sb;
- struct cifsTconInfo *pTcon;
+ 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;
+ FILE_ALL_INFO *buf = NULL;
struct inode *newinode = NULL;
- struct cifsFileInfo * pCifsFile = NULL;
- struct cifsInodeInfo * pCifsInode;
- int disposition = FILE_OVERWRITE_IF;
- int write_only = FALSE;
+ int disposition;
+ struct TCP_Server_Info *server = tcon->ses->server;
+ struct cifs_open_parms oparms;
- xid = GetXid();
+ *oplock = 0;
+ if (tcon->ses->server->oplocks)
+ *oplock = REQ_OPLOCK;
- cifs_sb = CIFS_SB(inode->i_sb);
- pTcon = cifs_sb->tcon;
-
- down(&direntry->d_sb->s_vfs_rename_sem);
full_path = build_path_from_dentry(direntry);
- up(&direntry->d_sb->s_vfs_rename_sem);
- if(full_path == NULL) {
- FreeXid(xid);
- return -ENOMEM;
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto out;
}
- if(nd && (nd->flags & LOOKUP_OPEN)) {
- int oflags = nd->intent.open.flags;
+ 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;
+ }
- desiredAccess = 0;
- if (oflags & FMODE_READ)
- desiredAccess |= GENERIC_READ;
- if (oflags & FMODE_WRITE) {
- desiredAccess |= GENERIC_WRITE;
- if (!(oflags & FMODE_READ))
- write_only = TRUE;
- }
+ 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;
- 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 {
- cFYI(1,("Create flag not set in create function"));
+ 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)
+ */
}
- /* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
- if (oplockEnabled)
- oplock = REQ_OPLOCK;
+ 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");
- buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
- if(buf == NULL) {
- kfree(full_path);
- FreeXid(xid);
- return -ENOMEM;
+ /*
+ * BB add processing to set equivalent of mode - e.g. via CreateX with
+ * ACLs
+ */
+
+ if (!server->ops->open) {
+ rc = -ENOSYS;
+ goto out;
}
- rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
- desiredAccess, CREATE_NOT_DIR,
- &fileHandle, &oplock, buf, cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
- if(rc == -EIO) {
- /* old server, retry the open legacy style */
- rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
- desiredAccess, CREATE_NOT_DIR,
- &fileHandle, &oplock, buf, cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
- }
+ 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) {
- cFYI(1, ("cifs_create returned 0x%x ", rc));
- } else {
- /* If Open reported that we actually created a file
- then we now have to set the mode if possible */
- if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
- (oplock & CIFS_CREATE_ACTION))
- if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
- CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
- (__u64)current->fsuid,
- (__u64)current->fsgid,
- 0 /* dev */,
- cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
- } else {
- CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
- (__u64)-1,
- (__u64)-1,
- 0 /* dev */,
- cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
- }
- else {
- /* BB implement mode setting via Windows security descriptors */
- /* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
- /* could set r/o dos attribute if mode & 0222 == 0 */
+ 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);*/
- /* BB server might mask mode so we have to query for Unix case*/
- if (pTcon->ses->capabilities & CAP_UNIX)
- 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);
- if(newinode) {
+ /* 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;
- newinode->i_gid = current->fsgid;
- }
+ 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();
}
}
+ }
- if (rc != 0) {
- cFYI(1,
- ("Create worked but get_inode_info failed rc = %d",
- rc));
- } else {
- if (pTcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
- else
- direntry->d_op = &cifs_dentry_ops;
- d_instantiate(direntry, newinode);
- }
- if((nd->flags & LOOKUP_OPEN) == FALSE) {
- /* mknod case - do not leave file open */
- CIFSSMBClose(xid, pTcon, fileHandle);
- } else if(newinode) {
- pCifsFile =
- kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
-
- if(pCifsFile == NULL)
- goto cifs_create_out;
- memset((char *)pCifsFile, 0,
- sizeof (struct cifsFileInfo));
- pCifsFile->netfid = fileHandle;
- pCifsFile->pid = current->tgid;
- pCifsFile->pInode = newinode;
- pCifsFile->invalidHandle = FALSE;
- pCifsFile->closePend = FALSE;
- init_MUTEX(&pCifsFile->fh_sem);
- /* set the following in open now
- pCifsFile->pfile = file; */
- write_lock(&GlobalSMBSeslock);
- list_add(&pCifsFile->tlist,&pTcon->openFileList);
- pCifsInode = CIFS_I(newinode);
- if(pCifsInode) {
- /* if readable file instance put first in list*/
- if (write_only == TRUE) {
- list_add_tail(&pCifsFile->flist,
- &pCifsInode->openFileList);
- } else {
- list_add(&pCifsFile->flist,
- &pCifsInode->openFileList);
- }
- if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
- pCifsInode->clientCanCacheAll = TRUE;
- pCifsInode->clientCanCacheRead = TRUE;
- cFYI(1,("Exclusive Oplock for inode %p",
- newinode));
- } else if((oplock & 0xF) == OPLOCK_READ)
- pCifsInode->clientCanCacheRead = TRUE;
- }
- write_unlock(&GlobalSMBSeslock);
- }
- }
-cifs_create_out:
+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);
- FreeXid(xid);
return rc;
}
-int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
- dev_t device_number)
+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);
+
+ 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;
+ }
+
+ 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: %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);
+ 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;
- int xid;
+ unsigned int xid;
+ int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
struct cifs_sb_info *cifs_sb;
- struct cifsTconInfo *pTcon;
+ struct tcon_link *tlink;
+ struct cifs_tcon *tcon;
+ struct cifs_io_parms io_parms;
char *full_path = NULL;
- struct inode * newinode = NULL;
+ struct inode *newinode = NULL;
+ int oplock = 0;
+ struct cifs_fid fid;
+ struct cifs_open_parms oparms;
+ FILE_ALL_INFO *buf = NULL;
+ unsigned int bytes_written;
+ struct win_dev *pdev;
if (!old_valid_dev(device_number))
return -EINVAL;
- xid = GetXid();
-
cifs_sb = CIFS_SB(inode->i_sb);
- pTcon = cifs_sb->tcon;
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink))
+ return PTR_ERR(tlink);
+
+ tcon = tlink_tcon(tlink);
+
+ xid = get_xid();
- down(&direntry->d_sb->s_vfs_rename_sem);
full_path = build_path_from_dentry(direntry);
- up(&direntry->d_sb->s_vfs_rename_sem);
- if(full_path == NULL)
+ if (full_path == NULL) {
rc = -ENOMEM;
- else if (pTcon->ses->capabilities & CAP_UNIX) {
- if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
- rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
- mode,(__u64)current->fsuid,(__u64)current->fsgid,
- device_number, cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
+ 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 {
- rc = CIFSSMBUnixSetPerms(xid, pTcon,
- full_path, mode, (__u64)-1, (__u64)-1,
- device_number, cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
+ args.uid = INVALID_UID; /* no change */
+ args.gid = INVALID_GID; /* no change */
}
+ rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
+ cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR);
+ if (rc)
+ goto mknod_out;
- if(!rc) {
- rc = cifs_get_inode_info_unix(&newinode, full_path,
- inode->i_sb,xid);
- if (pTcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
- else
- direntry->d_op = &cifs_dentry_ops;
- if(rc == 0)
- d_instantiate(direntry, newinode);
- }
- } else {
- if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
- int oplock = 0;
- u16 fileHandle;
- FILE_ALL_INFO * buf;
-
- cFYI(1,("sfu compat create special file"));
-
- buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
- if(buf == NULL) {
- kfree(full_path);
- FreeXid(xid);
- return -ENOMEM;
- }
+ rc = cifs_get_inode_info_unix(&newinode, full_path,
+ inode->i_sb, xid);
- rc = CIFSSMBOpen(xid, pTcon, full_path,
- FILE_CREATE, /* fail if exists */
- GENERIC_WRITE /* BB would
- WRITE_OWNER | WRITE_DAC be better? */,
- /* Create a file and set the
- file attribute to SYSTEM */
- CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
- &fileHandle, &oplock, buf,
- cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
-
- if(!rc) {
- /* BB Do not bother to decode buf since no
- local inode yet to put timestamps in,
- but we can reuse it safely */
- int bytes_written;
- struct win_dev *pdev;
- pdev = (struct win_dev *)buf;
- 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, pTcon,
- fileHandle,
- sizeof(struct win_dev),
- 0, &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, pTcon,
- fileHandle,
- sizeof(struct win_dev),
- 0, &bytes_written, (char *)pdev,
- NULL, 0);
- } /* else if(S_ISFIFO */
- CIFSSMBClose(xid, pTcon, fileHandle);
- d_drop(direntry);
- }
- kfree(buf);
- /* add code here to set EAs */
- }
+ 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;
+
+ rc = CIFS_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.netfid = fid.netfid;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = tcon;
+ 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, tcon, fid.netfid);
+ d_drop(direntry);
+
+ /* FIXME: add code here to set EAs */
+
+mknod_out:
kfree(full_path);
- FreeXid(xid);
+ kfree(buf);
+ free_xid(xid);
+ cifs_put_tlink(tlink);
return rc;
}
-
struct dentry *
-cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd)
+cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
+ unsigned int flags)
{
- int xid;
+ unsigned int xid;
int rc = 0; /* to get around spurious gcc warning, set to zero here */
struct cifs_sb_info *cifs_sb;
- struct cifsTconInfo *pTcon;
+ struct tcon_link *tlink;
+ struct cifs_tcon *pTcon;
struct inode *newInode = NULL;
char *full_path = NULL;
- xid = GetXid();
+ xid = get_xid();
- cFYI(1,
- (" parent inode = 0x%p name is: %s and dentry = 0x%p",
- parent_dir_inode, direntry->d_name.name, direntry));
-
- /* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
+ 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);
- pTcon = cifs_sb->tcon;
+ 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) {
- FreeXid(xid);
- return ERR_PTR(-ENOMEM);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto lookup_out;
}
if (direntry->d_inode != NULL) {
- cFYI(1, (" non-NULL inode in lookup"));
+ cifs_dbg(FYI, "non-NULL inode in lookup\n");
} else {
- cFYI(1, (" NULL inode in lookup"));
+ cifs_dbg(FYI, "NULL inode in lookup\n");
}
- cFYI(1,
- (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
+ cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
+ full_path, direntry->d_inode);
- if (pTcon->ses->capabilities & CAP_UNIX)
+ if (pTcon->unix_ext) {
rc = cifs_get_inode_info_unix(&newInode, full_path,
- parent_dir_inode->i_sb,xid);
- else
+ parent_dir_inode->i_sb, xid);
+ } else {
rc = cifs_get_inode_info(&newInode, full_path, NULL,
- parent_dir_inode->i_sb,xid);
+ parent_dir_inode->i_sb, xid, NULL);
+ }
if ((rc == 0) && (newInode != NULL)) {
- if (pTcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
- else
- direntry->d_op = &cifs_dentry_ops;
d_add(direntry, newInode);
-
- /* since paths are not looked up by component - the parent
+ /* 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;
- if (pTcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
- else
- direntry->d_op = &cifs_dentry_ops;
d_add(direntry, NULL);
- /* if it was once a directory (but how can we tell?) we could do
- shrink_dcache_parent(direntry); */
- } else {
- cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
- rc,full_path));
- /* BB special case check for Access Denied - watch security
- exposure of returning dir info implicitly via different rc
- if file exists or not but no access BB */
+ /* 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);
- FreeXid(xid);
+ cifs_put_tlink(tlink);
+ free_xid(xid);
return ERR_PTR(rc);
}
static int
-cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
+cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
{
- int isValid = 1;
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
if (direntry->d_inode) {
- if (cifs_revalidate(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(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;
}
- } else {
- cFYI(1, ("neg dentry 0x%p name = %s",
- direntry, direntry->d_name.name));
- if(time_after(jiffies, direntry->d_time + HZ) ||
- !lookupCacheEnabled) {
- d_drop(direntry);
- isValid = 0;
- }
}
- return isValid;
+ /*
+ * 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;
- cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
+ cifs_dbg(FYI, "In cifs d_delete, name = %s\n", direntry->d_name.name);
return rc;
} */
-struct dentry_operations cifs_dentry_ops = {
+const struct dentry_operations cifs_dentry_ops = {
.d_revalidate = cifs_d_revalidate,
-/* d_delete: cifs_d_delete, *//* not needed except for debugging */
- /* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
+ .d_automount = cifs_dfs_d_automount,
+/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
};
-static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
+static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
{
- struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
+ struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
unsigned long hash;
- int i;
+ wchar_t c;
+ int i, charlen;
hash = init_name_hash();
- for (i = 0; i < q->len; i++)
- hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
- 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(struct dentry *dentry, struct qstr *a,
- struct qstr *b)
+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(dentry->d_inode->i_sb)->local_nls;
+ 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 ((a->len == b->len) &&
- (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
/*
- * To preserve case, don't let an existing negative dentry's
- * case take precedence. If a is not a negative dentry, this
- * should have no side effects
+ * If we can't convert either character, just declare it to
+ * be 1 byte long and compare the original byte.
*/
- memcpy((unsigned char *)a->name, b->name, a->len);
- return 0;
+ 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 1;
+
+ return 0;
}
-struct dentry_operations cifs_ci_dentry_ops = {
+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,
};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 19:09:27 +0000