[Dazuko-devel] patch 5 for dazukofs release 3.0.0

[Lino Sanfilippo]

This patch is not a bug fix, but useful to increase performance:

dazukofs reports open events for all kind of files. But this does
mainly make sense for regular files (who wants to check
fifos for malware?).
Thus a simple check ensures that only open events for regular
files are announced to userspace.

(On my system a simple "find" command executed in /usr which was
mounted with dazukofs resulted in over 90000 context switches -
only caused by opening directories..)


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diff -rup dazukofs-3.0.0-p4/file.c dazukofs-3.0.0-p5/file.c
--- dazukofs-3.0.0-p4/file.c    2009-03-15 19:07:06.000000000 +0100
+++ dazukofs-3.0.0-p5/file.c    2009-03-15 19:26:14.000000000 +0100
@@ -177,9 +177,11 @@ static int dazukofs_open(struct inode *i
        struct file *lower_file;
        int err;
 
-       err = dazukofs_check_access(file->f_dentry, file->f_vfsmnt);
-       if (err)
-               goto error_out1;
+       if (S_ISREG(inode->i_mode)) {
+               err = dazukofs_check_access(file->f_dentry, file->f_vfsmnt);
+               if (err)
+                       goto error_out1;
+       }
 
        SET_FILE_INFO(file, kmem_cache_zalloc(dazukofs_file_info_cachep,
                      GFP_KERNEL));