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add f_flags to struct statfs(64)

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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>
This commit is contained in:
Christoph Hellwig
2010-07-07 18:53:25 +02:00
committed by Al Viro
parent ebabe9a900
commit 365b181897
5 changed files with 89 additions and 13 deletions
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25
include/linux/statfs.h
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@@ -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