[CIFS] file create with acl support enabled is slow

Shirish Pargaonkar noted:
With cifsacl mount option, when a file is created on the Windows server,
exclusive oplock is broken right away because the get cifs acl code
again opens the file to obtain security descriptor.
The client does not have the newly created file handle or inode in any
of its lists yet so it does not respond to oplock break and server waits for
its duration and then responds to the second open. This slows down file
creation signficantly.  The fix is to pass the file descriptor to the get
cifsacl code wherever available so that get cifs acl code does not send
second open (NT Create ANDX) and oplock is not broken.

CC: Shirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

6 files changed, 30 insertions, 22 deletions

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index f93932c21772..1f5a4289b848 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -1,7 +1,7 @@
 /*
  *   fs/cifs/cifsacl.c
  *
- *   Copyright (C) International Business Machines  Corp., 2007
+ *   Copyright (C) International Business Machines  Corp., 2007,2008
  *   Author(s): Steve French (sfrench@us.ibm.com)
  *
  *   Contains the routines for mapping CIFS/NTFS ACLs
@@ -556,9 +556,9 @@ static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
 
 /* Retrieve an ACL from the server */
 static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
-                                       const char *path)
+                                       const char *path, const __u16 *pfid)
 {
-        struct cifsFileInfo *open_file;
+        struct cifsFileInfo *open_file = NULL;
         int unlock_file = FALSE;
         int xid;
         int rc = -EIO;
@@ -573,7 +573,11 @@ static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
                 return NULL;
 
         xid = GetXid();
-        open_file = find_readable_file(CIFS_I(inode));
+        if (pfid == NULL)
+                open_file = find_readable_file(CIFS_I(inode));
+        else
+                fid = *pfid;
+
         sb = inode->i_sb;
         if (sb == NULL) {
                 FreeXid(xid);
@@ -584,7 +588,7 @@ static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
         if (open_file) {
                 unlock_file = TRUE;
                 fid = open_file->netfid;
-        } else {
+        } else if (pfid == NULL) {
                 int oplock = FALSE;
                 /* open file */
                 rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
@@ -600,10 +604,11 @@ static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
 
         rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
         cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));
-        if (unlock_file == TRUE)
+        if (unlock_file == TRUE) /* find_readable_file increments ref count */
                 atomic_dec(&open_file->wrtPending);
-        else
+        else if (pfid == NULL) /* if opened above we have to close the handle */
                 CIFSSMBClose(xid, cifs_sb->tcon, fid);
+        /* else handle was passed in by caller */
 
         FreeXid(xid);
         return pntsd;
@@ -664,14 +669,14 @@ static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
 }
 
 /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */
-void acl_to_uid_mode(struct inode *inode, const char *path)
+void acl_to_uid_mode(struct inode *inode, const char *path, const __u16 *pfid)
 {
         struct cifs_ntsd *pntsd = NULL;
         u32 acllen = 0;
         int rc = 0;
 
         cFYI(DBG2, ("converting ACL to mode for %s", path));
-        pntsd = get_cifs_acl(&acllen, inode, path);
+        pntsd = get_cifs_acl(&acllen, inode, path, pfid);
 
         /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */
         if (pntsd)
@@ -694,7 +699,7 @@ int mode_to_acl(struct inode *inode, const char *path, __u64 nmode)
         cFYI(DBG2, ("set ACL from mode for %s", path));
 
         /* Get the security descriptor */
-        pntsd = get_cifs_acl(&acllen, inode, path);
+        pntsd = get_cifs_acl(&acllen, inode, path, NULL);
 
         /* Add three ACEs for owner, group, everyone getting rid of
            other ACEs as chmod disables ACEs and set the security descriptor */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index a0414bda587c..7e5e0e78cd72 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -92,11 +92,12 @@ extern struct timespec cnvrtDosUnixTm(__u16 date, __u16 time);
 extern int cifs_get_inode_info(struct inode **pinode,
                         const unsigned char *search_path,
                         FILE_ALL_INFO * pfile_info,
-                        struct super_block *sb, int xid);
+                        struct super_block *sb, int xid, const __u16 *pfid);
 extern int cifs_get_inode_info_unix(struct inode **pinode,
                         const unsigned char *search_path,
                         struct super_block *sb, int xid);
-extern void acl_to_uid_mode(struct inode *inode, const char *search_path);
+extern void acl_to_uid_mode(struct inode *inode, const char *path,
+                            const __u16 *pfid);
 extern int mode_to_acl(struct inode *inode, const char *path, __u64);
 
 extern int cifs_mount(struct super_block *, struct cifs_sb_info *, char *,
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 4e83b47c4b34..0f5c62ba4038 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -229,7 +229,8 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
                                                  inode->i_sb, xid);
                 else {
                         rc = cifs_get_inode_info(&newinode, full_path,
-                                                 buf, inode->i_sb, xid);
+                                                 buf, inode->i_sb, xid,
+                                                 &fileHandle);
                         if (newinode) {
                                 newinode->i_mode = mode;
                                 if ((oplock & CIFS_CREATE_ACTION) &&
@@ -483,7 +484,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
                                               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)
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index fa849c91d323..40b690073fc1 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -145,7 +145,7 @@ client_can_cache:
                         full_path, inode->i_sb, xid);
         else
                 rc = cifs_get_inode_info(&file->f_path.dentry->d_inode,
-                        full_path, buf, inode->i_sb, xid);
+                        full_path, buf, inode->i_sb, xid, NULL);
 
         if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) {
                 pCifsInode->clientCanCacheAll = TRUE;
@@ -440,7 +440,7 @@ reopen_error_exit:
                                 else
                                         rc = cifs_get_inode_info(&inode,
                                                 full_path, NULL, inode->i_sb,
-                                                xid);
+                                                xid, NULL);
                         } /* else we are writing out data to server already
                              and could deadlock if we tried to flush data, and
                              since we do not know if we have data that would
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index e57e5c46ad48..7e4c24491729 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -371,7 +371,7 @@ static int get_sfu_mode(struct inode *inode,
 
 int cifs_get_inode_info(struct inode **pinode,
         const unsigned char *search_path, FILE_ALL_INFO *pfindData,
-        struct super_block *sb, int xid)
+        struct super_block *sb, int xid, const __u16 *pfid)
 {
         int rc = 0;
         struct cifsTconInfo *pTcon;
@@ -569,7 +569,7 @@ try_again_CIFSSMBQPathInfo:
                 /* fill in 0777 bits from ACL */
                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
                         cFYI(1, ("Getting mode bits from ACL"));
-                        acl_to_uid_mode(inode, search_path);
+                        acl_to_uid_mode(inode, search_path, pfid);
                 }
 #endif
                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
@@ -616,7 +616,8 @@ struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
         if (cifs_sb->tcon->unix_ext)
                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
         else
-                rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
+                rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
+                                         NULL);
         if (rc && cifs_sb->tcon->ipc) {
                 cFYI(1, ("ipc connection - fake read inode"));
                 inode->i_mode |= S_IFDIR;
@@ -949,7 +950,7 @@ mkdir_get_info:
                                                       inode->i_sb, xid);
                 else
                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
-                                                 inode->i_sb, xid);
+                                                 inode->i_sb, xid, NULL);
 
                 if (pTcon->nocase)
                         direntry->d_op = &cifs_ci_dentry_ops;
@@ -1231,7 +1232,7 @@ int cifs_revalidate(struct dentry *direntry)
                 }
         } else {
                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
-                                         direntry->d_sb, xid);
+                                         direntry->d_sb, xid, NULL);
                 if (rc) {
                         cFYI(1, ("error on getting revalidate info %d", rc));
 /*                      if (rc != -ENOENT)
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 1d6fb01b8e6d..d4e7ec93285f 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -205,7 +205,7 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
                                                       inode->i_sb, xid);
                 else
                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
-                                                 inode->i_sb, xid);
+                                                 inode->i_sb, xid, NULL);
 
                 if (rc != 0) {
                         cFYI(1, ("Create symlink ok, getinodeinfo fail rc = %d",