From: Theodore Ts'o Subject: [PATCH 2/3] buffer: add BH_Prio and BH_Meta flags Date: Sat, 20 Apr 2013 20:07:07 -0400 Message-ID: <1366502828-7793-2-git-send-email-tytso@mit.edu> References: <20130421000522.GA5054@thunk.org> <1366502828-7793-1-git-send-email-tytso@mit.edu> Cc: linux-mm@kvack.org, Linux Kernel Developers List , mgorman@suse.de, Theodore Ts'o To: Ext4 Developers List Return-path: In-Reply-To: <1366502828-7793-1-git-send-email-tytso@mit.edu> Sender: owner-linux-mm@kvack.org List-Id: linux-ext4.vger.kernel.org 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" --- fs/buffer.c | 5 +++++ include/linux/buffer_head.h | 4 ++++ 2 files changed, 9 insertions(+) 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) -- 1.7.12.rc0.22.gcdd159b -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org