[CIFS] reopen file via newer posix open protocol operation if available

If the network connection crashes, and we have to reopen files, preferentially
use the newer cifs posix open protocol operation if the server supports it.

Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 596fc8689371bc8159b07818f1ecb71444f36486..a069e7bfd2d09fc57d71f37be192befd444f2f3a 100644 (file)
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -92,6 +92,9 @@ extern u64 cifs_UnixTimeToNT(struct timespec);
 extern __le64 cnvrtDosCifsTm(__u16 date, __u16 time);
 extern struct timespec cnvrtDosUnixTm(__u16 date, __u16 time);
 
+extern int cifs_posix_open(char *full_path, struct inode **pinode,
+                          struct super_block *sb, int mode, int oflags,
+                          int *poplock, __u16 *pnetfid, int xid);
 extern void posix_fill_in_inode(struct inode *tmp_inode,
                                FILE_UNIX_BASIC_INFO *pData, int isNewInode);
 extern struct inode *cifs_new_inode(struct super_block *sb, __u64 *inum);

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 89fb728326523f6f3367a7343e057350341f423a..f9b6f68be976e062894da51dade4f78cedbdc8f1 100644 (file)
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -129,7 +129,7 @@ cifs_bp_rename_retry:
        return full_path;
 }
 
-static int cifs_posix_open(char *full_path, struct inode **pinode,
+int cifs_posix_open(char *full_path, struct inode **pinode,
                    struct super_block *sb, int mode, int oflags,
                    int *poplock, __u16 *pnetfid, int xid)
 {
@@ -187,7 +187,9 @@ static int cifs_posix_open(char *full_path, struct inode **pinode,
        if (!pinode)
                goto posix_open_ret; /* caller does not need info */
 
-       *pinode = cifs_new_inode(sb, &presp_data->UniqueId);
+       if (*pinode == NULL)
+               *pinode = cifs_new_inode(sb, &presp_data->UniqueId);
+       /* else an inode was passed in. Update its info, don't create one */
 
        /* We do not need to close the file if new_inode fails since
           the caller will retry qpathinfo as long as inode is null */

diff --cc fs/cifs/file.c
Simple merge