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authorChristoph Hellwig <hch@lst.de>2010-07-07 18:53:25 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2010-08-09 16:48:44 -0400
commit365b18189789bfa1acd9939e6312b8a4b4577b28 (patch)
treeffb71da8e11c7751002d018d0b44c41776bc92a3 /include/linux/statfs.h
parentebabe9a9001af0af56c0c2780ca1576246e7a74b (diff)
add f_flags to struct statfs(64)
Add a flags field to help glibc implementing statvfs(3) efficiently. We copy the flag values from glibc, and add a new ST_VALID flag to denote that f_flags is implemented. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/statfs.h')
-rw-r--r--include/linux/statfs.h25
1 files changed, 23 insertions, 2 deletions
diff --git a/include/linux/statfs.h b/include/linux/statfs.h
index b34cc829f98..0166d320a75 100644
--- a/include/linux/statfs.h
+++ b/include/linux/statfs.h
@@ -2,7 +2,6 @@
#define _LINUX_STATFS_H
#include <linux/types.h>
-
#include <asm/statfs.h>
struct kstatfs {
@@ -16,7 +15,29 @@ struct kstatfs {
__kernel_fsid_t f_fsid;
long f_namelen;
long f_frsize;
- long f_spare[5];
+ long f_flags;
+ long f_spare[4];
};
+/*
+ * Definitions for the flag in f_flag.
+ *
+ * Generally these flags are equivalent to the MS_ flags used in the mount
+ * ABI. The exception is ST_VALID which has the same value as MS_REMOUNT
+ * which doesn't make any sense for statfs.
+ */
+#define ST_RDONLY 0x0001 /* mount read-only */
+#define ST_NOSUID 0x0002 /* ignore suid and sgid bits */
+#define ST_NODEV 0x0004 /* disallow access to device special files */
+#define ST_NOEXEC 0x0008 /* disallow program execution */
+#define ST_SYNCHRONOUS 0x0010 /* writes are synced at once */
+#define ST_VALID 0x0020 /* f_flags support is implemented */
+#define ST_MANDLOCK 0x0040 /* allow mandatory locks on an FS */
+/* 0x0080 used for ST_WRITE in glibc */
+/* 0x0100 used for ST_APPEND in glibc */
+/* 0x0200 used for ST_IMMUTABLE in glibc */
+#define ST_NOATIME 0x0400 /* do not update access times */
+#define ST_NODIRATIME 0x0800 /* do not update directory access times */
+#define ST_RELATIME 0x1000 /* update atime relative to mtime/ctime */
+
#endif