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authorChristoph Hellwig <hch@infradead.org>2008-12-09 04:47:33 -0500
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-12-11 13:14:41 +1100
commit4d4be482a4d78ca906f45e99fd9fdb91e907f5ad (patch)
tree52974b28fecd3c11fc0596504270ffee976f1b1a /include
parent6d73cf133c5477f7038577bfeda603ce9946f8cb (diff)
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[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.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 51bd937..965b9ba 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
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