diff options
Diffstat (limited to 'release/src/linux/linux/fs/cifs/dir.c')
| -rw-r--r-- | release/src/linux/linux/fs/cifs/dir.c | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/release/src/linux/linux/fs/cifs/dir.c b/release/src/linux/linux/fs/cifs/dir.c new file mode 100644 index 00000000..123b0a6d --- /dev/null +++ b/release/src/linux/linux/fs/cifs/dir.c @@ -0,0 +1,425 @@ +/* + * fs/cifs/dir.c + * + * vfs operations that deal with dentries + * + * Copyright (C) International Business Machines Corp., 2002,2003 + * 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 "cifsfs.h" +#include "cifspdu.h" +#include "cifsglob.h" +#include "cifsproto.h" +#include "cifs_debug.h" +#include "cifs_fs_sb.h" + +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)); +} + +/* Note: caller must free return buffer */ +char * +build_path_from_dentry(struct dentry *direntry) +{ + struct dentry *temp; + int namelen = 0; + char *full_path; + + 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 */ + +cifs_bp_rename_retry: + for (temp = direntry; !IS_ROOT(temp);) { + namelen += (1 + temp->d_name.len); + temp = temp->d_parent; + if(temp == NULL) { + cERROR(1,("corrupt dentry")); + return NULL; + } + } + + full_path = kmalloc(namelen+1, GFP_KERNEL); + if(full_path == NULL) + return full_path; + full_path[namelen] = 0; /* trailing null */ + + for (temp = direntry; !IS_ROOT(temp);) { + namelen -= 1 + temp->d_name.len; + if (namelen < 0) { + break; + } else { + full_path[namelen] = '\\'; + strncpy(full_path + namelen + 1, temp->d_name.name, + temp->d_name.len); + cFYI(0, (" name: %s ", full_path + namelen)); + } + temp = temp->d_parent; + if(temp == NULL) { + cERROR(1,("corrupt dentry")); + 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 + 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; + } + + return full_path; +} + +/* Note: caller must free return buffer */ +char * +build_wildcard_path_from_dentry(struct dentry *direntry) +{ + struct dentry *temp; + int namelen = 0; + char *full_path; + + 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 */ + +cifs_bwp_rename_retry: + for (temp = direntry; !IS_ROOT(temp);) { + namelen += (1 + temp->d_name.len); + temp = temp->d_parent; + if(temp == NULL) { + cERROR(1,("corrupt dentry")); + return NULL; + } + } + + full_path = kmalloc(namelen+3, GFP_KERNEL); + if(full_path == NULL) + return full_path; + + full_path[namelen] = '\\'; + full_path[namelen+1] = '*'; + full_path[namelen+2] = 0; /* trailing null */ + + for (temp = direntry; !IS_ROOT(temp);) { + namelen -= 1 + temp->d_name.len; + if (namelen < 0) { + break; + } else { + full_path[namelen] = '\\'; + strncpy(full_path + namelen + 1, temp->d_name.name, + temp->d_name.len); + cFYI(0, (" name: %s ", full_path + namelen)); + } + temp = temp->d_parent; + if(temp == NULL) { + cERROR(1,("corrupt dentry")); + 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 + 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_bwp_rename_retry; + } + + return full_path; +} + +/* 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) +{ + int rc = -ENOENT; + int xid; + int oplock = 0; /* no sense requested oplock if we are just going to + immediately close the file */ + __u16 fileHandle; + struct cifs_sb_info *cifs_sb; + struct cifsTconInfo *pTcon; + char *full_path = NULL; + FILE_ALL_INFO * buf = NULL; + struct inode *newinode = NULL; + + xid = GetXid(); + + 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; + } + + /* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */ + + buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL); + rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OVERWRITE_IF, + GENERIC_WRITE, CREATE_NOT_DIR, + &fileHandle, &oplock, buf, cifs_sb->local_nls); + if (rc) { + cFYI(1, ("cifs_create returned 0x%x ", rc)); + } else { + /* BB for case of overwriting existing file can we use the inode that was + passed in rather than creating new one?? */ + 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 (rc != 0) { + cFYI(1,("Create worked but get_inode_info failed with rc = %d", + rc)); + } else { + direntry->d_op = &cifs_dentry_ops; + d_instantiate(direntry, newinode); + } + CIFSSMBClose(xid, pTcon, fileHandle); + + if(newinode) { + newinode->i_mode = mode; + if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) + CIFSSMBUnixSetPerms(xid, pTcon, full_path, inode->i_mode, + (__u64)-1, + (__u64)-1, + 0 /* dev */, + cifs_sb->local_nls); + else { /* BB implement via Windows security descriptors */ + /* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/ + /* in the meantime could set r/o dos attribute when perms are eg: + mode & 0222 == 0 */ + } + } + } + + if (buf) + kfree(buf); + if (full_path) + kfree(full_path); + FreeXid(xid); + + return rc; +} + +int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, int device_number) +{ + int rc = -EPERM; + int xid; + struct cifs_sb_info *cifs_sb; + struct cifsTconInfo *pTcon; + char *full_path = NULL; + struct inode * newinode = NULL; + + xid = GetXid(); + + 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) + rc = -ENOMEM; + + if (full_path && (pTcon->ses->capabilities & CAP_UNIX)) { + rc = CIFSSMBUnixSetPerms(xid, pTcon, + full_path, mode, current->euid, current->egid, + device_number, cifs_sb->local_nls); + if(!rc) { + rc = cifs_get_inode_info_unix(&newinode, full_path, + inode->i_sb,xid); + direntry->d_op = &cifs_dentry_ops; + if(rc == 0) + d_instantiate(direntry, newinode); + } + } + + if (full_path) + kfree(full_path); + FreeXid(xid); + + return rc; +} + + +struct dentry * +cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry) +{ + 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 inode *newInode = NULL; + char *full_path = NULL; + + xid = GetXid(); + + 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 */ + + /* check whether path exists */ + + cifs_sb = CIFS_SB(parent_dir_inode->i_sb); + pTcon = cifs_sb->tcon; + + /* 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 (direntry->d_inode != NULL) { + cFYI(1, (" non-NULL inode in lookup")); + } else { + cFYI(1, (" NULL inode in lookup")); + } + cFYI(1, + (" Full path: %s inode = 0x%p", full_path, direntry->d_inode)); + + if (pTcon->ses->capabilities & CAP_UNIX) + 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); + + if ((rc == 0) && (newInode != NULL)) { + direntry->d_op = &cifs_dentry_ops; + 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; + d_add(direntry, NULL); + } else { + cERROR(1,("Error 0x%x or on cifs_get_inode_info in lookup",rc)); + /* 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 (full_path) + kfree(full_path); + FreeXid(xid); + return ERR_PTR(rc); +} + +int +cifs_dir_open(struct inode *inode, struct file *file) +{ /* NB: currently unused since searches are opened in readdir */ + int rc = 0; + int xid; + struct cifs_sb_info *cifs_sb; + struct cifsTconInfo *pTcon; + char *full_path = NULL; + + xid = GetXid(); + + cifs_sb = CIFS_SB(inode->i_sb); + pTcon = cifs_sb->tcon; + + if(file->f_dentry) { + down(&file->f_dentry->d_sb->s_vfs_rename_sem); + full_path = build_wildcard_path_from_dentry(file->f_dentry); + up(&file->f_dentry->d_sb->s_vfs_rename_sem); + } else { + FreeXid(xid); + return -EIO; + } + + cFYI(1, ("inode = 0x%p and full path is %s", inode, full_path)); + + if (full_path) + kfree(full_path); + FreeXid(xid); + return rc; +} + +static int +cifs_d_revalidate(struct dentry *direntry, int flags) +{ + int isValid = 1; + +/* lock_kernel(); *//* surely we do not want to lock the kernel for a whole network round trip which could take seconds */ + + if (direntry->d_inode) { + if (cifs_revalidate(direntry)) { + /* unlock_kernel(); */ + return 0; + } + } else { + cFYI(1, + ("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p", + direntry->d_name.name, direntry)); + } + +/* unlock_kernel(); */ + + return isValid; +} + +/* static int cifs_d_delete(struct dentry *direntry) +{ + int rc = 0; + + cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name)); + + return rc; +} */ + +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 */ +}; |