diff options
| author | Saugata Das <saugata.das@linaro.org> | 2012-05-17 17:51:29 +0530 |
|---|---|---|
| committer | Venkatraman S <svenkatr@ti.com> | 2012-08-21 13:57:22 +0530 |
| commit | a8dac16b0f0aaa07604b52712d611034dee40e1f (patch) | |
| tree | 72553b620b78cd54545ac06348bbf52ee264e9a1 | |
| parent | d9875690d9b89a866022ff49e3fcea892345ad92 (diff) | |
| download | linux-topics-a8dac16b0f0aaa07604b52712d611034dee40e1f.tar.gz | |
block: add BH_Meta flag
Today, storage devices like eMMC has special features like data tagging
(introduced in MMC-4.5 version) in order to improve performance of some
specific writes. On MMC stack, data tagging is used for all writes which
has REQ_META flag set. This patch adds the capability to add REQ_META flag
during meta data write.
Signed-off-by: Saugata Das <saugata.das@linaro.org>
changes in v2:
Replaced the conditionals around submit_bh as suggested in the review
comments from Boaz
| -rw-r--r-- | fs/buffer.c | 6 | ||||
| -rw-r--r-- | include/linux/buffer_head.h | 2 |
2 files changed, 6 insertions, 2 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 9f6d2e41281..81d724b1fc1 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -1690,7 +1690,8 @@ static int __block_write_full_page(struct inode *inode, struct page *page, do { struct buffer_head *next = bh->b_this_page; if (buffer_async_write(bh)) { - submit_bh(write_op, bh); + submit_bh(write_op | + (buffer_meta(bh) << __REQ_META), bh); nr_underway++; } bh = next; @@ -1744,7 +1745,8 @@ recover: struct buffer_head *next = bh->b_this_page; if (buffer_async_write(bh)) { clear_buffer_dirty(bh); - submit_bh(write_op, bh); + submit_bh(write_op | + (buffer_meta(bh) << __REQ_META), bh); nr_underway++; } bh = next; diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 458f497738a..13bba1796db 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -34,6 +34,7 @@ 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, /* Is meta */ BH_PrivateStart,/* not a state bit, but the first bit available * for private allocation by other entities @@ -124,6 +125,7 @@ BUFFER_FNS(Delay, delay) BUFFER_FNS(Boundary, boundary) BUFFER_FNS(Write_EIO, write_io_error) BUFFER_FNS(Unwritten, unwritten) +BUFFER_FNS(Meta, meta) #define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK) #define touch_buffer(bh) mark_page_accessed(bh->b_page) |