Merge commit 'v2.6.34-rc2' into for-2.6.34

10 files changed, 336 insertions, 124 deletions

diff --git a/fs/cifs/asn1.c b/fs/cifs/asn1.c
index 20692fbfdb2..a20bea59893 100644
--- a/fs/cifs/asn1.c
+++ b/fs/cifs/asn1.c
@@ -136,7 +136,7 @@ asn1_enum_decode(struct asn1_ctx *ctx, __le32 *val)
 		return 0;
 	}
 
-	ch = *(ctx->pointer)++; /* ch has 0xa, ptr points to lenght octet */
+	ch = *(ctx->pointer)++; /* ch has 0xa, ptr points to length octet */
 	if ((ch) == ASN1_ENUM)  /* if ch value is ENUM, 0xa */
 		*val = *(++(ctx->pointer)); /* value has enum value */
 	else
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index b44ce0a0711..b1d61d0bdfc 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -54,7 +54,7 @@ void cifs_dfs_release_automount_timer(void)
  * Extracts sharename form full UNC.
  * i.e. strips from UNC trailing path that is not part of share
  * name and fixup missing '\' in the begining of DFS node refferal
- * if neccessary.
+ * if necessary.
  * Returns pointer to share name on success or ERR_PTR on error.
  * Caller is responsible for freeing returned string.
  */
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 8c6a0362717..5183bc2a191 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -312,6 +312,7 @@ cifs_alloc_inode(struct super_block *sb)
 	cifs_inode->clientCanCacheRead = false;
 	cifs_inode->clientCanCacheAll = false;
 	cifs_inode->delete_pending = false;
+	cifs_inode->invalid_mapping = false;
 	cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 	cifs_inode->server_eof = 0;
 
@@ -638,7 +639,7 @@ static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 		   setting the revalidate time to zero */
 		CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 
-		retval = cifs_revalidate(file->f_path.dentry);
+		retval = cifs_revalidate_file(file);
 		if (retval < 0)
 			return (loff_t)retval;
 	}
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 78c1b86d55f..7aa57ecdc43 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -61,7 +61,8 @@ extern int cifs_mkdir(struct inode *, struct dentry *, int);
 extern int cifs_rmdir(struct inode *, struct dentry *);
 extern int cifs_rename(struct inode *, struct dentry *, struct inode *,
 		       struct dentry *);
-extern int cifs_revalidate(struct dentry *);
+extern int cifs_revalidate_file(struct file *filp);
+extern int cifs_revalidate_dentry(struct dentry *);
 extern int cifs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 extern int cifs_setattr(struct dentry *, struct iattr *);
 
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index a1c817eb291..63c89d1d70b 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -389,6 +389,7 @@ struct cifsInodeInfo {
 	bool clientCanCacheRead:1;	/* read oplock */
 	bool clientCanCacheAll:1;	/* read and writebehind oplock */
 	bool delete_pending:1;		/* DELETE_ON_CLOSE is set */
+	bool invalid_mapping:1;		/* pagecache is invalid */
 	u64  server_eof;		/* current file size on server */
 	u64  uniqueid;			/* server inode number */
 	struct inode vfs_inode;
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 88e2bc44ac5..39e47f46dea 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -104,10 +104,12 @@ extern void cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr);
 extern struct inode *cifs_iget(struct super_block *sb,
 			       struct cifs_fattr *fattr);
 
+extern int cifs_get_file_info(struct file *filp);
 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, const __u16 *pfid);
+extern int cifs_get_file_info_unix(struct file *filp);
 extern int cifs_get_inode_info_unix(struct inode **pinode,
 			const unsigned char *search_path,
 			struct super_block *sb, int xid);
@@ -142,6 +144,8 @@ extern int CIFSFindNext(const int xid, struct cifsTconInfo *tcon,
 extern int CIFSFindClose(const int, struct cifsTconInfo *tcon,
 			const __u16 search_handle);
 
+extern int CIFSSMBQFileInfo(const int xid, struct cifsTconInfo *tcon,
+			u16 netfid, FILE_ALL_INFO *pFindData);
 extern int CIFSSMBQPathInfo(const int xid, struct cifsTconInfo *tcon,
 			const unsigned char *searchName,
 			FILE_ALL_INFO *findData,
@@ -152,6 +156,8 @@ extern int SMBQueryInformation(const int xid, struct cifsTconInfo *tcon,
 			FILE_ALL_INFO *findData,
 			const struct nls_table *nls_codepage, int remap);
 
+extern int CIFSSMBUnixQFileInfo(const int xid, struct cifsTconInfo *tcon,
+			u16 netfid, FILE_UNIX_BASIC_INFO *pFindData);
 extern int CIFSSMBUnixQPathInfo(const int xid,
 			struct cifsTconInfo *tcon,
 			const unsigned char *searchName,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 9d17df3e076..7cc7f83e931 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -500,7 +500,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
 	} else if (pSMBr->hdr.WordCount == 13) {
 		cERROR(1, ("mount failed, cifs module not built "
 			  "with CIFS_WEAK_PW_HASH support"));
-			rc = -EOPNOTSUPP;
+		rc = -EOPNOTSUPP;
 #endif /* WEAK_PW_HASH */
 		goto neg_err_exit;
 	} else if (pSMBr->hdr.WordCount != 17) {
@@ -3230,8 +3230,72 @@ QInfRetry:
 	return rc;
 }
 
+int
+CIFSSMBQFileInfo(const int xid, struct cifsTconInfo *tcon,
+		 u16 netfid, FILE_ALL_INFO *pFindData)
+{
+	struct smb_t2_qfi_req *pSMB = NULL;
+	struct smb_t2_qfi_rsp *pSMBr = NULL;
+	int rc = 0;
+	int bytes_returned;
+	__u16 params, byte_count;
 
+QFileInfoRetry:
+	rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
+		      (void **) &pSMBr);
+	if (rc)
+		return rc;
 
+	params = 2 /* level */ + 2 /* fid */;
+	pSMB->t2.TotalDataCount = 0;
+	pSMB->t2.MaxParameterCount = cpu_to_le16(4);
+	/* BB find exact max data count below from sess structure BB */
+	pSMB->t2.MaxDataCount = cpu_to_le16(CIFSMaxBufSize);
+	pSMB->t2.MaxSetupCount = 0;
+	pSMB->t2.Reserved = 0;
+	pSMB->t2.Flags = 0;
+	pSMB->t2.Timeout = 0;
+	pSMB->t2.Reserved2 = 0;
+	pSMB->t2.ParameterOffset = cpu_to_le16(offsetof(struct smb_t2_qfi_req,
+					       Fid) - 4);
+	pSMB->t2.DataCount = 0;
+	pSMB->t2.DataOffset = 0;
+	pSMB->t2.SetupCount = 1;
+	pSMB->t2.Reserved3 = 0;
+	pSMB->t2.SubCommand = cpu_to_le16(TRANS2_QUERY_FILE_INFORMATION);
+	byte_count = params + 1 /* pad */ ;
+	pSMB->t2.TotalParameterCount = cpu_to_le16(params);
+	pSMB->t2.ParameterCount = pSMB->t2.TotalParameterCount;
+	pSMB->InformationLevel = cpu_to_le16(SMB_QUERY_FILE_ALL_INFO);
+	pSMB->Pad = 0;
+	pSMB->Fid = netfid;
+	pSMB->hdr.smb_buf_length += byte_count;
+
+	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
+			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+	if (rc) {
+		cFYI(1, ("Send error in QPathInfo = %d", rc));
+	} else {		/* decode response */
+		rc = validate_t2((struct smb_t2_rsp *)pSMBr);
+
+		if (rc) /* BB add auto retry on EOPNOTSUPP? */
+			rc = -EIO;
+		else if (pSMBr->ByteCount < 40)
+			rc = -EIO;	/* bad smb */
+		else if (pFindData) {
+			__u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
+			memcpy((char *) pFindData,
+			       (char *) &pSMBr->hdr.Protocol +
+			       data_offset, sizeof(FILE_ALL_INFO));
+		} else
+		    rc = -ENOMEM;
+	}
+	cifs_buf_release(pSMB);
+	if (rc == -EAGAIN)
+		goto QFileInfoRetry;
+
+	return rc;
+}
 
 int
 CIFSSMBQPathInfo(const int xid, struct cifsTconInfo *tcon,
@@ -3335,6 +3399,75 @@ QPathInfoRetry:
 }
 
 int
+CIFSSMBUnixQFileInfo(const int xid, struct cifsTconInfo *tcon,
+		 u16 netfid, FILE_UNIX_BASIC_INFO *pFindData)
+{
+	struct smb_t2_qfi_req *pSMB = NULL;
+	struct smb_t2_qfi_rsp *pSMBr = NULL;
+	int rc = 0;
+	int bytes_returned;
+	__u16 params, byte_count;
+
+UnixQFileInfoRetry:
+	rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
+		      (void **) &pSMBr);
+	if (rc)
+		return rc;
+
+	params = 2 /* level */ + 2 /* fid */;
+	pSMB->t2.TotalDataCount = 0;
+	pSMB->t2.MaxParameterCount = cpu_to_le16(4);
+	/* BB find exact max data count below from sess structure BB */
+	pSMB->t2.MaxDataCount = cpu_to_le16(CIFSMaxBufSize);
+	pSMB->t2.MaxSetupCount = 0;
+	pSMB->t2.Reserved = 0;
+	pSMB->t2.Flags = 0;
+	pSMB->t2.Timeout = 0;
+	pSMB->t2.Reserved2 = 0;
+	pSMB->t2.ParameterOffset = cpu_to_le16(offsetof(struct smb_t2_qfi_req,
+					       Fid) - 4);
+	pSMB->t2.DataCount = 0;
+	pSMB->t2.DataOffset = 0;
+	pSMB->t2.SetupCount = 1;
+	pSMB->t2.Reserved3 = 0;
+	pSMB->t2.SubCommand = cpu_to_le16(TRANS2_QUERY_FILE_INFORMATION);
+	byte_count = params + 1 /* pad */ ;
+	pSMB->t2.TotalParameterCount = cpu_to_le16(params);
+	pSMB->t2.ParameterCount = pSMB->t2.TotalParameterCount;
+	pSMB->InformationLevel = cpu_to_le16(SMB_QUERY_FILE_UNIX_BASIC);
+	pSMB->Pad = 0;
+	pSMB->Fid = netfid;
+	pSMB->hdr.smb_buf_length += byte_count;
+
+	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
+			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+	if (rc) {
+		cFYI(1, ("Send error in QPathInfo = %d", rc));
+	} else {		/* decode response */
+		rc = validate_t2((struct smb_t2_rsp *)pSMBr);
+
+		if (rc || (pSMBr->ByteCount < sizeof(FILE_UNIX_BASIC_INFO))) {
+			cERROR(1, ("Malformed FILE_UNIX_BASIC_INFO response.\n"
+				   "Unix Extensions can be disabled on mount "
+				   "by specifying the nosfu mount option."));
+			rc = -EIO;	/* bad smb */
+		} else {
+			__u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
+			memcpy((char *) pFindData,
+			       (char *) &pSMBr->hdr.Protocol +
+			       data_offset,
+			       sizeof(FILE_UNIX_BASIC_INFO));
+		}
+	}
+
+	cifs_buf_release(pSMB);
+	if (rc == -EAGAIN)
+		goto UnixQFileInfoRetry;
+
+	return rc;
+}
+
+int
 CIFSSMBUnixQPathInfo(const int xid, struct cifsTconInfo *tcon,
 		     const unsigned char *searchName,
 		     FILE_UNIX_BASIC_INFO *pFindData,
@@ -3886,7 +4019,7 @@ parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr,
 		goto parse_DFS_referrals_exit;
 	}
 
-	/* collect neccessary data from referrals */
+	/* collect necessary data from referrals */
 	for (i = 0; i < *num_of_nodes; i++) {
 		char *temp;
 		int max_len;
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 6ccf7262d1b..e9f7ecc2714 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -739,7 +739,7 @@ cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
 	int isValid = 1;
 
 	if (direntry->d_inode) {
-		if (cifs_revalidate(direntry))
+		if (cifs_revalidate_dentry(direntry))
 			return 0;
 	} else {
 		cFYI(1, ("neg dentry 0x%p name = %s",
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 3d8f8a96f5a..ca2ba7a0193 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -219,8 +219,8 @@ static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
 		cFYI(1, ("inode unchanged on server"));
 	} else {
 		if (file->f_path.dentry->d_inode->i_mapping) {
-		/* BB no need to lock inode until after invalidate
-		   since namei code should already have it locked? */
+			/* BB no need to lock inode until after invalidate
+			since namei code should already have it locked? */
 			rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping);
 			if (rc != 0)
 				CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc;
@@ -1890,11 +1890,10 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
 
 int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
-	struct dentry *dentry = file->f_path.dentry;
 	int rc, xid;
 
 	xid = GetXid();
-	rc = cifs_revalidate(dentry);
+	rc = cifs_revalidate_file(file);
 	if (rc) {
 		cFYI(1, ("Validation prior to mmap failed, error=%d", rc));
 		FreeXid(xid);
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 8bdbc818164..723daaccbd0 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -77,6 +77,41 @@ static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
 	}
 }
 
+/* check inode attributes against fattr. If they don't match, tag the
+ * inode for cache invalidation
+ */
+static void
+cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
+{
+	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
+
+	cFYI(1, ("%s: revalidating inode %llu", __func__, cifs_i->uniqueid));
+
+	if (inode->i_state & I_NEW) {
+		cFYI(1, ("%s: inode %llu is new", __func__, cifs_i->uniqueid));
+		return;
+	}
+
+	/* don't bother with revalidation if we have an oplock */
+	if (cifs_i->clientCanCacheRead) {
+		cFYI(1, ("%s: inode %llu is oplocked", __func__,
+			 cifs_i->uniqueid));
+		return;
+	}
+
+	 /* revalidate if mtime or size have changed */
+	if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
+	    cifs_i->server_eof == fattr->cf_eof) {
+		cFYI(1, ("%s: inode %llu is unchanged", __func__,
+			 cifs_i->uniqueid));
+		return;
+	}
+
+	cFYI(1, ("%s: invalidating inode %llu mapping", __func__,
+		 cifs_i->uniqueid));
+	cifs_i->invalid_mapping = true;
+}
+
 /* populate an inode with info from a cifs_fattr struct */
 void
 cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
@@ -85,6 +120,8 @@ cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 	unsigned long oldtime = cifs_i->time;
 
+	cifs_revalidate_cache(inode, fattr);
+
 	inode->i_atime = fattr->cf_atime;
 	inode->i_mtime = fattr->cf_mtime;
 	inode->i_ctime = fattr->cf_ctime;
@@ -231,6 +268,31 @@ cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
 	fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
 }
 
+int cifs_get_file_info_unix(struct file *filp)
+{
+	int rc;
+	int xid;
+	FILE_UNIX_BASIC_INFO find_data;
+	struct cifs_fattr fattr;
+	struct inode *inode = filp->f_path.dentry->d_inode;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifsTconInfo *tcon = cifs_sb->tcon;
+	struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
+
+	xid = GetXid();
+	rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->netfid, &find_data);
+	if (!rc) {
+		cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
+	} else if (rc == -EREMOTE) {
+		cifs_create_dfs_fattr(&fattr, inode->i_sb);
+		rc = 0;
+	}
+
+	cifs_fattr_to_inode(inode, &fattr);
+	FreeXid(xid);
+	return rc;
+}
+
 int cifs_get_inode_info_unix(struct inode **pinode,
 			     const unsigned char *full_path,
 			     struct super_block *sb, int xid)
@@ -432,6 +494,47 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
 	fattr->cf_gid = cifs_sb->mnt_gid;
 }
 
+int cifs_get_file_info(struct file *filp)
+{
+	int rc;
+	int xid;
+	FILE_ALL_INFO find_data;
+	struct cifs_fattr fattr;
+	struct inode *inode = filp->f_path.dentry->d_inode;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifsTconInfo *tcon = cifs_sb->tcon;
+	struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
+
+	xid = GetXid();
+	rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
+	if (rc == -EOPNOTSUPP || rc == -EINVAL) {
+		/*
+		 * FIXME: legacy server -- fall back to path-based call?
+		 * for now, just skip revalidating and mark inode for
+		 * immediate reval.
+		 */
+		rc = 0;
+		CIFS_I(inode)->time = 0;
+		goto cgfi_exit;
+	} else if (rc == -EREMOTE) {
+		cifs_create_dfs_fattr(&fattr, inode->i_sb);
+		rc = 0;
+	} else if (rc)
+		goto cgfi_exit;
+
+	/*
+	 * don't bother with SFU junk here -- just mark inode as needing
+	 * revalidation.
+	 */
+	cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
+	fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
+	fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
+	cifs_fattr_to_inode(inode, &fattr);
+cgfi_exit:
+	FreeXid(xid);
+	return rc;
+}
+
 int cifs_get_inode_info(struct inode **pinode,
 	const unsigned char *full_path, FILE_ALL_INFO *pfindData,
 	struct super_block *sb, int xid, const __u16 *pfid)
@@ -1389,135 +1492,103 @@ cifs_rename_exit:
 	return rc;
 }
 
-int cifs_revalidate(struct dentry *direntry)
+static bool
+cifs_inode_needs_reval(struct inode *inode)
 {
-	int xid;
-	int rc = 0, wbrc = 0;
-	char *full_path;
-	struct cifs_sb_info *cifs_sb;
-	struct cifsInodeInfo *cifsInode;
-	loff_t local_size;
-	struct timespec local_mtime;
-	bool invalidate_inode = false;
+	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
 
-	if (direntry->d_inode == NULL)
-		return -ENOENT;
+	if (cifs_i->clientCanCacheRead)
+		return false;
 
-	cifsInode = CIFS_I(direntry->d_inode);
+	if (!lookupCacheEnabled)
+		return true;
 
-	if (cifsInode == NULL)
-		return -ENOENT;
+	if (cifs_i->time == 0)
+		return true;
 
-	/* no sense revalidating inode info on file that no one can write */
-	if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
-		return rc;
+	/* FIXME: the actimeo should be tunable */
+	if (time_after_eq(jiffies, cifs_i->time + HZ))
+		return true;
+
+	return false;
+}
+
+/* check invalid_mapping flag and zap the cache if it's set */
+static void
+cifs_invalidate_mapping(struct inode *inode)
+{
+	int rc;
+	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
+
+	cifs_i->invalid_mapping = false;
+
+	/* write back any cached data */
+	if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
+		rc = filemap_write_and_wait(inode->i_mapping);
+		if (rc)
+			cifs_i->write_behind_rc = rc;
+	}
+	invalidate_remote_inode(inode);
+}
+
+int cifs_revalidate_file(struct file *filp)
+{
+	int rc = 0;
+	struct inode *inode = filp->f_path.dentry->d_inode;
+
+	if (!cifs_inode_needs_reval(inode))
+		goto check_inval;
+
+	if (CIFS_SB(inode->i_sb)->tcon->unix_ext)
+		rc = cifs_get_file_info_unix(filp);
+	else
+		rc = cifs_get_file_info(filp);
+
+check_inval:
+	if (CIFS_I(inode)->invalid_mapping)
+		cifs_invalidate_mapping(inode);
+
+	return rc;
+}
+
+/* revalidate a dentry's inode attributes */
+int cifs_revalidate_dentry(struct dentry *dentry)
+{
+	int xid;
+	int rc = 0;
+	char *full_path = NULL;
+	struct inode *inode = dentry->d_inode;
+	struct super_block *sb = dentry->d_sb;
+
+	if (inode == NULL)
+		return -ENOENT;
 
 	xid = GetXid();
 
-	cifs_sb = CIFS_SB(direntry->d_sb);
+	if (!cifs_inode_needs_reval(inode))
+		goto check_inval;
 
 	/* can not safely grab the rename sem here if rename calls revalidate
 	   since that would deadlock */
-	full_path = build_path_from_dentry(direntry);
+	full_path = build_path_from_dentry(dentry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
-		FreeXid(xid);
-		return rc;
-	}
-	cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
-		 "jiffies %ld", full_path, direntry->d_inode,
-		 direntry->d_inode->i_count.counter, direntry,
-		 direntry->d_time, jiffies));
-
-	if (cifsInode->time == 0) {
-		/* was set to zero previously to force revalidate */
-	} else if (time_before(jiffies, cifsInode->time + HZ) &&
-		   lookupCacheEnabled) {
-		if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
-		    (direntry->d_inode->i_nlink == 1)) {
-			kfree(full_path);
-			FreeXid(xid);
-			return rc;
-		} else {
-			cFYI(1, ("Have to revalidate file due to hardlinks"));
-		}
-	}
-
-	/* save mtime and size */
-	local_mtime = direntry->d_inode->i_mtime;
-	local_size = direntry->d_inode->i_size;
-
-	if (cifs_sb->tcon->unix_ext) {
-		rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
-					      direntry->d_sb, xid);
-		if (rc) {
-			cFYI(1, ("error on getting revalidate info %d", rc));
-/*			if (rc != -ENOENT)
-				rc = 0; */	/* BB should we cache info on
-						   certain errors? */
-		}
-	} else {
-		rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
-					 direntry->d_sb, xid, NULL);
-		if (rc) {
-			cFYI(1, ("error on getting revalidate info %d", rc));
-/*			if (rc != -ENOENT)
-				rc = 0; */	/* BB should we cache info on
-						   certain errors? */
-		}
+		goto check_inval;
 	}
-	/* should we remap certain errors, access denied?, to zero */
 
-	/* if not oplocked, we invalidate inode pages if mtime or file size
-	   had changed on server */
+	cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
+		 "jiffies %ld", full_path, inode, inode->i_count.counter,
+		 dentry, dentry->d_time, jiffies));
 
-	if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
-	    (local_size == direntry->d_inode->i_size)) {
-		cFYI(1, ("cifs_revalidate - inode unchanged"));
-	} else {
-		/* file may have changed on server */
-		if (cifsInode->clientCanCacheRead) {
-			/* no need to invalidate inode pages since we were the
-			   only ones who could have modified the file and the
-			   server copy is staler than ours */
-		} else {
-			invalidate_inode = true;
-		}
-	}
+	if (CIFS_SB(sb)->tcon->unix_ext)
+		rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
+	else
+		rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
+					 xid, NULL);
 
-	/* can not grab this sem since kernel filesys locking documentation
-	   indicates i_mutex may be taken by the kernel on lookup and rename
-	   which could deadlock if we grab the i_mutex here as well */
-/*	mutex_lock(&direntry->d_inode->i_mutex);*/
-	/* need to write out dirty pages here  */
-	if (direntry->d_inode->i_mapping) {
-		/* do we need to lock inode until after invalidate completes
-		   below? */
-		wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
-		if (wbrc)
-			CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
-	}
-	if (invalidate_inode) {
-	/* shrink_dcache not necessary now that cifs dentry ops
-	are exported for negative dentries */
-/*		if (S_ISDIR(direntry->d_inode->i_mode))
-			shrink_dcache_parent(direntry); */
-		if (S_ISREG(direntry->d_inode->i_mode)) {
-			if (direntry->d_inode->i_mapping) {
-				wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
-				if (wbrc)
-					CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
-			}
-			/* may eventually have to do this for open files too */
-			if (list_empty(&(cifsInode->openFileList))) {
-				/* changed on server - flush read ahead pages */
-				cFYI(1, ("Invalidating read ahead data on "
-					 "closed file"));
-				invalidate_remote_inode(direntry->d_inode);
-			}
-		}
-	}
-/*	mutex_unlock(&direntry->d_inode->i_mutex); */
+check_inval:
+	if (CIFS_I(inode)->invalid_mapping)
+		cifs_invalidate_mapping(inode);
 
 	kfree(full_path);
 	FreeXid(xid);
@@ -1527,7 +1598,7 @@ int cifs_revalidate(struct dentry *direntry)
 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 	struct kstat *stat)
 {
-	int err = cifs_revalidate(dentry);
+	int err = cifs_revalidate_dentry(dentry);
 	if (!err) {
 		generic_fillattr(dentry->d_inode, stat);
 		stat->blksize = CIFS_MAX_MSGSIZE;