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[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>
This commit is contained in:
Steve French 2008-03-14 22:37:16 +00:00
parent ebe8912be2
commit 8b1327f6ed
6 changed files with 30 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
fs/cifs/cifsacl.c
View File

@ -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 */

5
fs/cifs/cifsproto.h
View File

@ -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 *,

5
fs/cifs/dir.c
View File

@ -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)

4
fs/cifs/file.c
View File

@ -145,7 +145,7 @@ static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
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 @@ static int cifs_reopen_file(struct file *file, int can_flush)
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

11
fs/cifs/inode.c
View File

@ -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 @@ int cifs_get_inode_info(struct inode **pinode,
/* 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 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
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)

2
fs/cifs/link.c
View File

@ -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",