Extended Attributes part 1

Signed-off-by: Steve French (sfrench@us.ibm.com)

fs/cifs/TODO

@@ -80,27 +80,13 @@ symlink text beginning with slash
 but recognizes them
 3) create of new files to FAT partitions on Windows servers can
 succeed but still return access denied (appears to be Windows 
-not client problem) and has not been reproduced recently.
+server not cifs client problem) and has not been reproduced recently.
 NTFS partitions do not have this problem.
 4) debug connectation lock test case 10 which fails against
 Samba (may be unmappable due to POSIX to Windows lock model
 differences but worth investigating).  Also debug Samba to 
 see why lock test case 7 takes longer to complete to Samba
 than to Windows.
-5) prepare_write does not initialize pages properly when partial
-page writes begin in the middle of a page (pages can get zeroed).
-6) Write caching done incorrectly when files are only opened
-with write permission by the application.
-7) Rename of files that are hardlinked does not work correctly e.g.
-	ln source target
-	mv source target 
-This should be no op since files are linked but in cifs it causes
-the source file to go away. This may require implementation of
-the cifs POSIX extensions (Unix Extensions version 2) for
-it to be done correctly since Samba is failing the rename,
-(rather than ignoring it) so the client not knowing they
-are linked proceeds to delete the target and then retry the
-move which succeeds this time (but the source is gone).
 
 Misc testing to do
 ==================

fs/cifs/cifsproto.h

@@ -247,4 +247,8 @@ extern int CIFSSMBCopy(int xid,
 extern int CIFSSMBNotify(const int xid, struct cifsTconInfo *tcon, 
 			const int notify_subdirs,const __u16 netfid,__u32 filter,
 			const struct nls_table *nls_codepage);
+extern int CIFSSMBQAllEAs(const int xid, struct cifsTconInfo *tcon,
+		 const unsigned char *searchName,
+		 char * EAData, size_t size,
+		 const struct nls_table *nls_codepage);
 #endif			/* _CIFSPROTO_H */

fs/cifs/cifssmb.c

@@ -1596,6 +1596,8 @@ CIFSSMBQPathInfo(const int xid, struct cifsTconInfo *tcon,
 	} else {		/* decode response */
 		pSMBr->DataOffset = le16_to_cpu(pSMBr->DataOffset);
 		/* BB also check enough total bytes returned */
+		/* BB we need to improve the validity checking
+		of these trans2 responses */
 		if ((pSMBr->ByteCount < 40) || (pSMBr->DataOffset > 512)) 
 			rc = -EIO;	/* bad smb */
 		else if (pFindData){
@@ -2879,3 +2881,88 @@ int CIFSSMBNotify(const int xid, struct cifsTconInfo *tcon,
 			goto NotifyRetry; */
 	return rc;	
 }
+#ifdef CONFIG_CIFS_XATTR
+int
+CIFSSMBQAllEAs(const int xid, struct cifsTconInfo *tcon,
+		 const unsigned char *searchName,
+		 char * EAData, size_t size,
+		 const struct nls_table *nls_codepage)
+{
+		/* BB assumes one setup word */
+	TRANSACTION2_QPI_REQ *pSMB = NULL;
+	TRANSACTION2_QPI_RSP *pSMBr = NULL;
+	int rc = 0;
+	int bytes_returned;
+	int name_len;
+
+	cFYI(1, ("In Query All EAs path %s", searchName));
+QAllEAsRetry:
+	rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
+		      (void **) &pSMBr);
+	if (rc)
+		return rc;
+
+	if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
+		name_len =
+		    cifs_strtoUCS((wchar_t *) pSMB->FileName, searchName, 530
+				  /* find define for this maxpathcomponent */
+				  , nls_codepage);
+		name_len++;	/* trailing null */
+		name_len *= 2;
+	} else {		/* BB improve the check for buffer overruns BB */
+		name_len = strnlen(searchName, 530);
+		name_len++;	/* trailing null */
+		strncpy(pSMB->FileName, searchName, name_len);
+	}
+
+	pSMB->TotalParameterCount = 2 /* level */  + 4 /* reserved */  +
+	    name_len /* includes null */ ;
+	pSMB->TotalDataCount = 0;
+	pSMB->MaxParameterCount = cpu_to_le16(2);
+	pSMB->MaxDataCount = cpu_to_le16(4000);	/* BB find exact max SMB PDU from sess structure BB */
+	pSMB->MaxSetupCount = 0;
+	pSMB->Reserved = 0;
+	pSMB->Flags = 0;
+	pSMB->Timeout = 0;
+	pSMB->Reserved2 = 0;
+	pSMB->ParameterOffset = cpu_to_le16(offsetof(
+        struct smb_com_transaction2_qpi_req ,InformationLevel) - 4);
+	pSMB->DataCount = 0;
+	pSMB->DataOffset = 0;
+	pSMB->SetupCount = 1;
+	pSMB->Reserved3 = 0;
+	pSMB->SubCommand = cpu_to_le16(TRANS2_QUERY_PATH_INFORMATION);
+	pSMB->ByteCount = pSMB->TotalParameterCount + 1 /* pad */ ;
+	pSMB->TotalParameterCount = cpu_to_le16(pSMB->TotalParameterCount);
+	pSMB->ParameterCount = pSMB->TotalParameterCount;
+	pSMB->InformationLevel = cpu_to_le16(SMB_INFO_QUERY_ALL_EAS);
+	pSMB->Reserved4 = 0;
+	pSMB->hdr.smb_buf_length += pSMB->ByteCount;
+	pSMB->ByteCount = cpu_to_le16(pSMB->ByteCount);
+
+	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
+			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+	if (rc) {
+		cFYI(1, ("Send error in QueryAllEAs = %d", rc));
+	} else {		/* decode response */
+		pSMBr->DataOffset = le16_to_cpu(pSMBr->DataOffset);
+		/* BB also check enough total bytes returned */
+		/* BB we need to improve the validity checking
+		of these trans2 responses */
+		if ((pSMBr->ByteCount < 4) || (pSMBr->DataOffset > 512)) 
+			rc = -EIO;	/* bad smb */
+	   /* else if (pFindData){
+			memcpy((char *) pFindData,
+			       (char *) &pSMBr->hdr.Protocol +
+			       pSMBr->DataOffset, kl);
+		}*/ else
+		    rc = -ENOMEM;
+	}
+	if (pSMB)
+		cifs_buf_release(pSMB);
+	if (rc == -EAGAIN)
+		goto QAllEAsRetry;
+
+	return rc;
+}
+#endif

fs/cifs/xattr.c

@@ -20,6 +20,11 @@
  */
 
 #include <linux/fs.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
 
 int cifs_removexattr(struct dentry * direntry, const char * name)
 {
@@ -44,13 +49,39 @@ ssize_t cifs_getxattr(struct dentry * direntry, const char * name,
 ssize_t cifs_listxattr(struct dentry * direntry, char * ea_data, size_t ea_size)
 {
 	ssize_t rc = -EOPNOTSUPP;
+	int xid;
+	struct cifs_sb_info *cifs_sb;
+	struct cifsTconInfo *pTcon;
+	struct super_block * sb;
+	char * full_path;
+#ifdef CONFIG_CIFS_XATTR
+	if(direntry == NULL)
+		return -EIO;
+	if(direntry->d_inode)
+		return -EIO;
+	sb = direntry->d_inode->i_sb;
+	if(sb == NULL)
+		return -EIO;
+	xid = GetXid();
 
+	cifs_sb = CIFS_SB(sb);
+	pTcon = cifs_sb->tcon;
+
+	down(&sb->s_vfs_rename_sem);
+	full_path = build_path_from_dentry(direntry);
+	up(&sb->s_vfs_rename_sem);
+	if(full_path == NULL) {
+		FreeXid(xid);
+		return -ENOMEM;
+	}
 	/* return dosattributes as pseudo xattr */
 	/* return alt name if available as pseudo attr */
 
 	/* if proc/fs/cifs/streamstoxattr is set then
 		search server for EAs or streams to 
 		returns as xattrs */
-
+	rc = CIFSSMBQAllEAs(xid,pTcon,full_path,ea_data,ea_size,cifs_sb->local_nls);
+	FreeXid(xid);
+#endif
 	return rc;
 }