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| author | Christoph Hellwig <hch@infradead.org> | 2008-12-09 10:47:33 +0100 |
|---|---|---|
| committer | Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> | 2008-12-11 03:14:41 +0100 |
| commit | 4d4be482a4d78ca906f45e99fd9fdb91e907f5ad (patch) | |
| tree | 52974b28fecd3c11fc0596504270ffee976f1b1a /include | |
| parent | [XFS] resync headers with libxfs (diff) | |
| download | linux-4d4be482a4d78ca906f45e99fd9fdb91e907f5ad.tar.xz linux-4d4be482a4d78ca906f45e99fd9fdb91e907f5ad.zip | |
[XFS] add a FMODE flag to make XFS invisible I/O less hacky
XFS has a mode called invisble I/O that doesn't update any of the
timestamps. It's used for HSM-style applications and exposed through
the nasty open by handle ioctl.
Instead of doing directly assignment of file operations that set an
internal flag for it add a new FMODE_NOCMTIME flag that we can check
in the normal file operations.
(addition of the generic VFS flag has been ACKed by Al as an interims
solution)
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fs.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 51bd9370d437..965b9ba3865d 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -81,6 +81,14 @@ extern int dir_notify_enable; #define FMODE_WRITE_IOCTL ((__force fmode_t)128) #define FMODE_NDELAY_NOW ((__force fmode_t)256) +/* + * Don't update ctime and mtime. + * + * Currently a special hack for the XFS open_by_handle ioctl, but we'll + * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. + */ +#define FMODE_NOCMTIME ((__force fmode_t)2048) + #define RW_MASK 1 #define RWA_MASK 2 #define READ 0 |