Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 523 insertions, 0 deletions

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
new file mode 100644
index 000000000000..f54e1866f0f4
--- /dev/null
+++ b/fs/cifs/dir.c
@@ -0,0 +1,523 @@
+/*
+ *   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 <linux/namei.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,
+                struct nameidata *nd)
+{
+        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;
+        char *full_path = 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;
+
+        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;
+        }
+
+        if(nd) {
+                if ((nd->intent.open.flags & O_ACCMODE) == O_RDONLY)
+                        desiredAccess = GENERIC_READ;
+                else if ((nd->intent.open.flags & O_ACCMODE) == O_WRONLY) {
+                        desiredAccess = GENERIC_WRITE;
+                        write_only = TRUE;
+                } else if ((nd->intent.open.flags & O_ACCMODE) == O_RDWR) {
+                        /* GENERIC_ALL is too much permission to request */
+                        /* can cause unnecessary access denied on create */
+                        /* desiredAccess = GENERIC_ALL; */
+                        desiredAccess = GENERIC_READ | GENERIC_WRITE;
+                }
+
+                if((nd->intent.open.flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
+                        disposition = FILE_CREATE;
+                else if((nd->intent.open.flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
+                        disposition = FILE_OVERWRITE_IF;
+                else if((nd->intent.open.flags & O_CREAT) == O_CREAT)
+                        disposition = FILE_OPEN_IF;
+                else {
+                        cFYI(1,("Create flag not set in create function"));
+                }
+        }
+
+        /* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
+        if (oplockEnabled)
+                oplock = REQ_OPLOCK;
+
+        buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
+        if(buf == NULL) {
+                kfree(full_path);
+                FreeXid(xid);
+                return -ENOMEM;
+        }
+
+        rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
+                         desiredAccess, CREATE_NOT_DIR,
+                         &fileHandle, &oplock, buf, cifs_sb->local_nls);
+        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->euid,
+                                        (__u64)current->egid,
+                                        0 /* dev */,
+                                        cifs_sb->local_nls);
+                        } else {
+                                CIFSSMBUnixSetPerms(xid, pTcon, full_path, 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);*/
+                        /* could set r/o dos attribute if mode & 0222 == 0 */
+                }
+
+        /* 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)
+                                newinode->i_mode = mode;
+                }
+
+                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);
+                }
+                if((nd->flags & LOOKUP_OPEN) == FALSE) {
+                        /* mknod case - do not leave file open */
+                        CIFSSMBClose(xid, pTcon, fileHandle);
+                } else if(newinode) {
+                        pCifsFile = (struct cifsFileInfo *)
+                           kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
+                
+                        if (pCifsFile) {
+                                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);
+                                /* put the following in at 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 granted on inode %p",
+                                                        newinode));
+                                        } else if((oplock & 0xF) == OPLOCK_READ)
+                                                pCifsInode->clientCanCacheRead = TRUE;
+                                }
+                                write_unlock(&GlobalSMBSeslock);
+                        }
+                }
+        } 
+
+        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, dev_t device_number) 
+{
+        int rc = -EPERM;
+        int xid;
+        struct cifs_sb_info *cifs_sb;
+        struct cifsTconInfo *pTcon;
+        char *full_path = NULL;
+        struct inode * newinode = NULL;
+
+        if (!old_valid_dev(device_number))
+                return -EINVAL;
+
+        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)) {
+                if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+                        rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
+                                mode,(__u64)current->euid,(__u64)current->egid,
+                                device_number, cifs_sb->local_nls);
+                } else {
+                        rc = CIFSSMBUnixSetPerms(xid, pTcon,
+                                full_path, mode, (__u64)-1, (__u64)-1,
+                                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, struct nameidata *nd)
+{
+        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, struct nameidata *nd)
+{
+        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 */
+};