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authorTheodore Ts'o <tytso@mit.edu>2013-04-21 03:58:37 +0400
committerTheodore Ts'o <tytso@mit.edu>2013-04-21 03:58:37 +0400
commit877f962c5edacfef60ab21cfed6d8d54ce25b8a6 (patch)
tree298d7667d0d66b06a4314a9df1c67fd188d66dba /include/linux/buffer_head.h
parent9f203507ed277ee86e3f76a15e09db1c92e40b94 (diff)
downloadlinux-877f962c5edacfef60ab21cfed6d8d54ce25b8a6.tar.xz
buffer: add BH_Prio and BH_Meta flags
Add buffer_head flags so that buffer cache writebacks can be marked with the the appropriate request flags, so that metadata blocks can be marked appropriately in blktrace. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'include/linux/buffer_head.h')
-rw-r--r--include/linux/buffer_head.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 5afc4f94d110..33c0f8103fe4 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -34,6 +34,8 @@ enum bh_state_bits {
BH_Write_EIO, /* I/O error on write */
BH_Unwritten, /* Buffer is allocated on disk but not written */
BH_Quiet, /* Buffer Error Prinks to be quiet */
+ BH_Meta, /* Buffer contains metadata */
+ BH_Prio, /* Buffer should be submitted with REQ_PRIO */
BH_PrivateStart,/* not a state bit, but the first bit available
* for private allocation by other entities
@@ -124,6 +126,8 @@ BUFFER_FNS(Delay, delay)
BUFFER_FNS(Boundary, boundary)
BUFFER_FNS(Write_EIO, write_io_error)
BUFFER_FNS(Unwritten, unwritten)
+BUFFER_FNS(Meta, meta)
+BUFFER_FNS(Prio, prio)
#define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)