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| author | Theodore Ts'o <tytso@mit.edu> | 2013-04-20 19:58:37 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-04-20 19:58:37 -0400 |
| commit | 877f962c5edacfef60ab21cfed6d8d54ce25b8a6 (patch) | |
| tree | 298d7667d0d66b06a4314a9df1c67fd188d66dba | |
| parent | 9f203507ed277ee86e3f76a15e09db1c92e40b94 (diff) | |
| download | op-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.c | 5 | ||||
| -rw-r--r-- | include/linux/buffer_head.h | 4 |
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) |
