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authorTheodore Ts'o <tytso@mit.edu>2013-04-20 19:58:37 -0400
committerTheodore Ts'o <tytso@mit.edu>2013-04-20 19:58:37 -0400
commit877f962c5edacfef60ab21cfed6d8d54ce25b8a6 (patch)
tree298d7667d0d66b06a4314a9df1c67fd188d66dba
parent9f203507ed277ee86e3f76a15e09db1c92e40b94 (diff)
downloadop-kernel-dev-877f962c5edacfef60ab21cfed6d8d54ce25b8a6.zip
op-kernel-dev-877f962c5edacfef60ab21cfed6d8d54ce25b8a6.tar.gz
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>
-rw-r--r--fs/buffer.c5
-rw-r--r--include/linux/buffer_head.h4
2 files changed, 9 insertions, 0 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index b4dcb34..a15575c 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2988,6 +2988,11 @@ int submit_bh(int rw, struct buffer_head * bh)
/* Take care of bh's that straddle the end of the device */
guard_bh_eod(rw, bio, bh);
+ if (buffer_meta(bh))
+ rw |= REQ_META;
+ if (buffer_prio(bh))
+ rw |= REQ_PRIO;
+
bio_get(bio);
submit_bio(rw, bio);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 5afc4f9..33c0f81 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)
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