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authorChristoph Hellwig <hch@lst.de>2010-08-11 17:06:24 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2010-08-18 01:09:01 -0400
commit9cb569d601e0b93e01c20a22872270ec663b75f6 (patch)
tree80b2568fae48018806e82f8884062dae8a5494ae /include
parent87e99511ea54510ffb60b98001d108794d5037f8 (diff)
downloadlinux-9cb569d601e0b93e01c20a22872270ec663b75f6.tar.bz2
remove SWRITE* I/O types
These flags aren't real I/O types, but tell ll_rw_block to always lock the buffer instead of giving up on a failed trylock. Instead add a new write_dirty_buffer helper that implements this semantic and use it from the existing SWRITE* callers. Note that the ll_rw_block code had a bug where it didn't promote WRITE_SYNC_PLUG properly, which this patch fixes. In the ufs code clean up the helper that used to call ll_rw_block to mirror sync_dirty_buffer, which is the function it implements for compound buffers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include')
-rw-r--r--include/linux/buffer_head.h1
-rw-r--r--include/linux/fs.h9
2 files changed, 1 insertions, 9 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 72c1cf83eb85..ec94c12f21da 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -182,6 +182,7 @@ void __lock_buffer(struct buffer_head *bh);
void ll_rw_block(int, int, struct buffer_head * bh[]);
int sync_dirty_buffer(struct buffer_head *bh);
int __sync_dirty_buffer(struct buffer_head *bh, int rw);
+void write_dirty_buffer(struct buffer_head *bh, int rw);
int submit_bh(int, struct buffer_head *);
void write_boundary_block(struct block_device *bdev,
sector_t bblock, unsigned blocksize);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9a96b4d83fc1..29f7c975304c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -125,9 +125,6 @@ struct inodes_stat_t {
* block layer could (in theory) choose to ignore this
* request if it runs into resource problems.
* WRITE A normal async write. Device will be plugged.
- * SWRITE Like WRITE, but a special case for ll_rw_block() that
- * tells it to lock the buffer first. Normally a buffer
- * must be locked before doing IO.
* WRITE_SYNC_PLUG Synchronous write. Identical to WRITE, but passes down
* the hint that someone will be waiting on this IO
* shortly. The device must still be unplugged explicitly,
@@ -138,9 +135,6 @@ struct inodes_stat_t {
* immediately after submission. The write equivalent
* of READ_SYNC.
* WRITE_ODIRECT_PLUG Special case write for O_DIRECT only.
- * SWRITE_SYNC
- * SWRITE_SYNC_PLUG Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer.
- * See SWRITE.
* WRITE_BARRIER Like WRITE_SYNC, but tells the block layer that all
* previously submitted writes must be safely on storage
* before this one is started. Also guarantees that when
@@ -155,7 +149,6 @@ struct inodes_stat_t {
#define READ 0
#define WRITE RW_MASK
#define READA RWA_MASK
-#define SWRITE (WRITE | READA)
#define READ_SYNC (READ | REQ_SYNC | REQ_UNPLUG)
#define READ_META (READ | REQ_META)
@@ -165,8 +158,6 @@ struct inodes_stat_t {
#define WRITE_META (WRITE | REQ_META)
#define WRITE_BARRIER (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
REQ_HARDBARRIER)
-#define SWRITE_SYNC_PLUG (SWRITE | REQ_SYNC | REQ_NOIDLE)
-#define SWRITE_SYNC (SWRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG)
/*
* These aren't really reads or writes, they pass down information about