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Diffstat (limited to 'fs/buffer.c')
-rw-r--r--fs/buffer.c266
1 files changed, 168 insertions, 98 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index 33be29675358..9c8eb9b6db6a 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -21,6 +21,7 @@
#include <linux/kernel.h>
#include <linux/syscalls.h>
#include <linux/fs.h>
+#include <linux/iomap.h>
#include <linux/mm.h>
#include <linux/percpu.h>
#include <linux/slab.h>
@@ -45,7 +46,7 @@
#include <trace/events/block.h>
static int fsync_buffers_list(spinlock_t *lock, struct list_head *list);
-static int submit_bh_wbc(int rw, struct buffer_head *bh,
+static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
unsigned long bio_flags,
struct writeback_control *wbc);
@@ -129,7 +130,7 @@ __clear_page_buffers(struct page *page)
{
ClearPagePrivate(page);
set_page_private(page, 0);
- page_cache_release(page);
+ put_page(page);
}
static void buffer_io_error(struct buffer_head *bh, char *msg)
@@ -153,7 +154,7 @@ static void __end_buffer_read_notouch(struct buffer_head *bh, int uptodate)
if (uptodate) {
set_buffer_uptodate(bh);
} else {
- /* This happens, due to failed READA attempts. */
+ /* This happens, due to failed read-ahead attempts. */
clear_buffer_uptodate(bh);
}
unlock_buffer(bh);
@@ -207,7 +208,7 @@ __find_get_block_slow(struct block_device *bdev, sector_t block)
struct page *page;
int all_mapped = 1;
- index = block >> (PAGE_CACHE_SHIFT - bd_inode->i_blkbits);
+ index = block >> (PAGE_SHIFT - bd_inode->i_blkbits);
page = find_get_page_flags(bd_mapping, index, FGP_ACCESSED);
if (!page)
goto out;
@@ -245,7 +246,7 @@ __find_get_block_slow(struct block_device *bdev, sector_t block)
}
out_unlock:
spin_unlock(&bd_mapping->private_lock);
- page_cache_release(page);
+ put_page(page);
out:
return ret;
}
@@ -255,17 +256,17 @@ out:
*/
static void free_more_memory(void)
{
- struct zone *zone;
+ struct zoneref *z;
int nid;
wakeup_flusher_threads(1024, WB_REASON_FREE_MORE_MEM);
yield();
for_each_online_node(nid) {
- (void)first_zones_zonelist(node_zonelist(nid, GFP_NOFS),
- gfp_zone(GFP_NOFS), NULL,
- &zone);
- if (zone)
+
+ z = first_zones_zonelist(node_zonelist(nid, GFP_NOFS),
+ gfp_zone(GFP_NOFS), NULL);
+ if (z->zone)
try_to_free_pages(node_zonelist(nid, GFP_NOFS), 0,
GFP_NOFS, NULL);
}
@@ -588,7 +589,7 @@ void write_boundary_block(struct block_device *bdev,
struct buffer_head *bh = __find_get_block(bdev, bblock + 1, blocksize);
if (bh) {
if (buffer_dirty(bh))
- ll_rw_block(WRITE, 1, &bh);
+ ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
put_bh(bh);
}
}
@@ -1040,7 +1041,7 @@ done:
ret = (block < end_block) ? 1 : -ENXIO;
failed:
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
return ret;
}
@@ -1225,7 +1226,7 @@ static struct buffer_head *__bread_slow(struct buffer_head *bh)
} else {
get_bh(bh);
bh->b_end_io = end_buffer_read_sync;
- submit_bh(READ, bh);
+ submit_bh(REQ_OP_READ, 0, bh);
wait_on_buffer(bh);
if (buffer_uptodate(bh))
return bh;
@@ -1395,7 +1396,7 @@ void __breadahead(struct block_device *bdev, sector_t block, unsigned size)
{
struct buffer_head *bh = __getblk(bdev, block, size);
if (likely(bh)) {
- ll_rw_block(READA, 1, &bh);
+ ll_rw_block(REQ_OP_READ, REQ_RAHEAD, 1, &bh);
brelse(bh);
}
}
@@ -1533,7 +1534,7 @@ void block_invalidatepage(struct page *page, unsigned int offset,
/*
* Check for overflow
*/
- BUG_ON(stop > PAGE_CACHE_SIZE || stop < length);
+ BUG_ON(stop > PAGE_SIZE || stop < length);
head = page_buffers(page);
bh = head;
@@ -1687,7 +1688,7 @@ static struct buffer_head *create_page_buffers(struct page *page, struct inode *
* WB_SYNC_ALL, the writes are posted using WRITE_SYNC; this
* causes the writes to be flagged as synchronous writes.
*/
-static int __block_write_full_page(struct inode *inode, struct page *page,
+int __block_write_full_page(struct inode *inode, struct page *page,
get_block_t *get_block, struct writeback_control *wbc,
bh_end_io_t *handler)
{
@@ -1697,7 +1698,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
struct buffer_head *bh, *head;
unsigned int blocksize, bbits;
int nr_underway = 0;
- int write_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
+ int write_flags = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : 0);
head = create_page_buffers(page, inode,
(1 << BH_Dirty)|(1 << BH_Uptodate));
@@ -1716,7 +1717,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
blocksize = bh->b_size;
bbits = block_size_bits(blocksize);
- block = (sector_t)page->index << (PAGE_CACHE_SHIFT - bbits);
+ block = (sector_t)page->index << (PAGE_SHIFT - bbits);
last_block = (i_size_read(inode) - 1) >> bbits;
/*
@@ -1786,7 +1787,7 @@ 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_wbc(write_op, bh, 0, wbc);
+ submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, 0, wbc);
nr_underway++;
}
bh = next;
@@ -1840,7 +1841,7 @@ recover:
struct buffer_head *next = bh->b_this_page;
if (buffer_async_write(bh)) {
clear_buffer_dirty(bh);
- submit_bh_wbc(write_op, bh, 0, wbc);
+ submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, 0, wbc);
nr_underway++;
}
bh = next;
@@ -1848,6 +1849,7 @@ recover:
unlock_page(page);
goto done;
}
+EXPORT_SYMBOL(__block_write_full_page);
/*
* If a page has any new buffers, zero them out here, and mark them uptodate
@@ -1891,10 +1893,64 @@ void page_zero_new_buffers(struct page *page, unsigned from, unsigned to)
}
EXPORT_SYMBOL(page_zero_new_buffers);
-int __block_write_begin(struct page *page, loff_t pos, unsigned len,
- get_block_t *get_block)
+static void
+iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh,
+ struct iomap *iomap)
+{
+ loff_t offset = block << inode->i_blkbits;
+
+ bh->b_bdev = iomap->bdev;
+
+ /*
+ * Block points to offset in file we need to map, iomap contains
+ * the offset at which the map starts. If the map ends before the
+ * current block, then do not map the buffer and let the caller
+ * handle it.
+ */
+ BUG_ON(offset >= iomap->offset + iomap->length);
+
+ switch (iomap->type) {
+ case IOMAP_HOLE:
+ /*
+ * If the buffer is not up to date or beyond the current EOF,
+ * we need to mark it as new to ensure sub-block zeroing is
+ * executed if necessary.
+ */
+ if (!buffer_uptodate(bh) ||
+ (offset >= i_size_read(inode)))
+ set_buffer_new(bh);
+ break;
+ case IOMAP_DELALLOC:
+ if (!buffer_uptodate(bh) ||
+ (offset >= i_size_read(inode)))
+ set_buffer_new(bh);
+ set_buffer_uptodate(bh);
+ set_buffer_mapped(bh);
+ set_buffer_delay(bh);
+ break;
+ case IOMAP_UNWRITTEN:
+ /*
+ * For unwritten regions, we always need to ensure that
+ * sub-block writes cause the regions in the block we are not
+ * writing to are zeroed. Set the buffer as new to ensure this.
+ */
+ set_buffer_new(bh);
+ set_buffer_unwritten(bh);
+ /* FALLTHRU */
+ case IOMAP_MAPPED:
+ if (offset >= i_size_read(inode))
+ set_buffer_new(bh);
+ bh->b_blocknr = (iomap->blkno >> (inode->i_blkbits - 9)) +
+ ((offset - iomap->offset) >> inode->i_blkbits);
+ set_buffer_mapped(bh);
+ break;
+ }
+}
+
+int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
+ get_block_t *get_block, struct iomap *iomap)
{
- unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+ unsigned from = pos & (PAGE_SIZE - 1);
unsigned to = from + len;
struct inode *inode = page->mapping->host;
unsigned block_start, block_end;
@@ -1904,15 +1960,15 @@ int __block_write_begin(struct page *page, loff_t pos, unsigned len,
struct buffer_head *bh, *head, *wait[2], **wait_bh=wait;
BUG_ON(!PageLocked(page));
- BUG_ON(from > PAGE_CACHE_SIZE);
- BUG_ON(to > PAGE_CACHE_SIZE);
+ BUG_ON(from > PAGE_SIZE);
+ BUG_ON(to > PAGE_SIZE);
BUG_ON(from > to);
head = create_page_buffers(page, inode, 0);
blocksize = head->b_size;
bbits = block_size_bits(blocksize);
- block = (sector_t)page->index << (PAGE_CACHE_SHIFT - bbits);
+ block = (sector_t)page->index << (PAGE_SHIFT - bbits);
for(bh = head, block_start = 0; bh != head || !block_start;
block++, block_start=block_end, bh = bh->b_this_page) {
@@ -1928,9 +1984,14 @@ int __block_write_begin(struct page *page, loff_t pos, unsigned len,
clear_buffer_new(bh);
if (!buffer_mapped(bh)) {
WARN_ON(bh->b_size != blocksize);
- err = get_block(inode, block, bh, 1);
- if (err)
- break;
+ if (get_block) {
+ err = get_block(inode, block, bh, 1);
+ if (err)
+ break;
+ } else {
+ iomap_to_bh(inode, block, bh, iomap);
+ }
+
if (buffer_new(bh)) {
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
@@ -1955,7 +2016,7 @@ int __block_write_begin(struct page *page, loff_t pos, unsigned len,
if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
!buffer_unwritten(bh) &&
(block_start < from || block_end > to)) {
- ll_rw_block(READ, 1, &bh);
+ ll_rw_block(REQ_OP_READ, 0, 1, &bh);
*wait_bh++=bh;
}
}
@@ -1971,6 +2032,12 @@ int __block_write_begin(struct page *page, loff_t pos, unsigned len,
page_zero_new_buffers(page, from, to);
return err;
}
+
+int __block_write_begin(struct page *page, loff_t pos, unsigned len,
+ get_block_t *get_block)
+{
+ return __block_write_begin_int(page, pos, len, get_block, NULL);
+}
EXPORT_SYMBOL(__block_write_begin);
static int __block_commit_write(struct inode *inode, struct page *page,
@@ -2020,7 +2087,7 @@ static int __block_commit_write(struct inode *inode, struct page *page,
int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
unsigned flags, struct page **pagep, get_block_t *get_block)
{
- pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+ pgoff_t index = pos >> PAGE_SHIFT;
struct page *page;
int status;
@@ -2031,7 +2098,7 @@ int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
status = __block_write_begin(page, pos, len, get_block);
if (unlikely(status)) {
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
page = NULL;
}
@@ -2047,7 +2114,7 @@ int block_write_end(struct file *file, struct address_space *mapping,
struct inode *inode = mapping->host;
unsigned start;
- start = pos & (PAGE_CACHE_SIZE - 1);
+ start = pos & (PAGE_SIZE - 1);
if (unlikely(copied < len)) {
/*
@@ -2099,7 +2166,7 @@ int generic_write_end(struct file *file, struct address_space *mapping,
}
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
if (old_size < pos)
pagecache_isize_extended(inode, old_size, pos);
@@ -2136,9 +2203,9 @@ int block_is_partially_uptodate(struct page *page, unsigned long from,
head = page_buffers(page);
blocksize = head->b_size;
- to = min_t(unsigned, PAGE_CACHE_SIZE - from, count);
+ to = min_t(unsigned, PAGE_SIZE - from, count);
to = from + to;
- if (from < blocksize && to > PAGE_CACHE_SIZE - blocksize)
+ if (from < blocksize && to > PAGE_SIZE - blocksize)
return 0;
bh = head;
@@ -2181,7 +2248,7 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
blocksize = head->b_size;
bbits = block_size_bits(blocksize);
- iblock = (sector_t)page->index << (PAGE_CACHE_SHIFT - bbits);
+ iblock = (sector_t)page->index << (PAGE_SHIFT - bbits);
lblock = (i_size_read(inode)+blocksize-1) >> bbits;
bh = head;
nr = 0;
@@ -2248,7 +2315,7 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
if (buffer_uptodate(bh))
end_buffer_async_read(bh, 1);
else
- submit_bh(READ, bh);
+ submit_bh(REQ_OP_READ, 0, bh);
}
return 0;
}
@@ -2295,16 +2362,16 @@ static int cont_expand_zero(struct file *file, struct address_space *mapping,
unsigned zerofrom, offset, len;
int err = 0;
- index = pos >> PAGE_CACHE_SHIFT;
- offset = pos & ~PAGE_CACHE_MASK;
+ index = pos >> PAGE_SHIFT;
+ offset = pos & ~PAGE_MASK;
- while (index > (curidx = (curpos = *bytes)>>PAGE_CACHE_SHIFT)) {
- zerofrom = curpos & ~PAGE_CACHE_MASK;
+ while (index > (curidx = (curpos = *bytes)>>PAGE_SHIFT)) {
+ zerofrom = curpos & ~PAGE_MASK;
if (zerofrom & (blocksize-1)) {
*bytes |= (blocksize-1);
(*bytes)++;
}
- len = PAGE_CACHE_SIZE - zerofrom;
+ len = PAGE_SIZE - zerofrom;
err = pagecache_write_begin(file, mapping, curpos, len,
AOP_FLAG_UNINTERRUPTIBLE,
@@ -2329,7 +2396,7 @@ static int cont_expand_zero(struct file *file, struct address_space *mapping,
/* page covers the boundary, find the boundary offset */
if (index == curidx) {
- zerofrom = curpos & ~PAGE_CACHE_MASK;
+ zerofrom = curpos & ~PAGE_MASK;
/* if we will expand the thing last block will be filled */
if (offset <= zerofrom) {
goto out;
@@ -2375,7 +2442,7 @@ int cont_write_begin(struct file *file, struct address_space *mapping,
if (err)
return err;
- zerofrom = *bytes & ~PAGE_CACHE_MASK;
+ zerofrom = *bytes & ~PAGE_MASK;
if (pos+len > *bytes && zerofrom & (blocksize-1)) {
*bytes |= (blocksize-1);
(*bytes)++;
@@ -2430,10 +2497,10 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
}
/* page is wholly or partially inside EOF */
- if (((page->index + 1) << PAGE_CACHE_SHIFT) > size)
- end = size & ~PAGE_CACHE_MASK;
+ if (((page->index + 1) << PAGE_SHIFT) > size)
+ end = size & ~PAGE_MASK;
else
- end = PAGE_CACHE_SIZE;
+ end = PAGE_SIZE;
ret = __block_write_begin(page, 0, end, get_block);
if (!ret)
@@ -2508,8 +2575,8 @@ int nobh_write_begin(struct address_space *mapping,
int ret = 0;
int is_mapped_to_disk = 1;
- index = pos >> PAGE_CACHE_SHIFT;
- from = pos & (PAGE_CACHE_SIZE - 1);
+ index = pos >> PAGE_SHIFT;
+ from = pos & (PAGE_SIZE - 1);
to = from + len;
page = grab_cache_page_write_begin(mapping, index, flags);
@@ -2543,7 +2610,7 @@ int nobh_write_begin(struct address_space *mapping,
goto out_release;
}
- block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits);
+ block_in_file = (sector_t)page->index << (PAGE_SHIFT - blkbits);
/*
* We loop across all blocks in the page, whether or not they are
@@ -2551,7 +2618,7 @@ int nobh_write_begin(struct address_space *mapping,
* page is fully mapped-to-disk.
*/
for (block_start = 0, block_in_page = 0, bh = head;
- block_start < PAGE_CACHE_SIZE;
+ block_start < PAGE_SIZE;
block_in_page++, block_start += blocksize, bh = bh->b_this_page) {
int create;
@@ -2582,7 +2649,7 @@ int nobh_write_begin(struct address_space *mapping,
if (block_start < from || block_end > to) {
lock_buffer(bh);
bh->b_end_io = end_buffer_read_nobh;
- submit_bh(READ, bh);
+ submit_bh(REQ_OP_READ, 0, bh);
nr_reads++;
}
}
@@ -2623,7 +2690,7 @@ failed:
out_release:
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
*pagep = NULL;
return ret;
@@ -2653,7 +2720,7 @@ int nobh_write_end(struct file *file, struct address_space *mapping,
}
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
while (head) {
bh = head;
@@ -2675,7 +2742,7 @@ int nobh_writepage(struct page *page, get_block_t *get_block,
{
struct inode * const inode = page->mapping->host;
loff_t i_size = i_size_read(inode);
- const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ const pgoff_t end_index = i_size >> PAGE_SHIFT;
unsigned offset;
int ret;
@@ -2684,7 +2751,7 @@ int nobh_writepage(struct page *page, get_block_t *get_block,
goto out;
/* Is the page fully outside i_size? (truncate in progress) */
- offset = i_size & (PAGE_CACHE_SIZE-1);
+ offset = i_size & (PAGE_SIZE-1);
if (page->index >= end_index+1 || !offset) {
/*
* The page may have dirty, unmapped buffers. For example,
@@ -2707,7 +2774,7 @@ int nobh_writepage(struct page *page, get_block_t *get_block,
* the page size, the remaining memory is zeroed when mapped, and
* writes to that region are not written out to the file."
*/
- zero_user_segment(page, offset, PAGE_CACHE_SIZE);
+ zero_user_segment(page, offset, PAGE_SIZE);
out:
ret = mpage_writepage(page, get_block, wbc);
if (ret == -EAGAIN)
@@ -2720,8 +2787,8 @@ EXPORT_SYMBOL(nobh_writepage);
int nobh_truncate_page(struct address_space *mapping,
loff_t from, get_block_t *get_block)
{
- pgoff_t index = from >> PAGE_CACHE_SHIFT;
- unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ pgoff_t index = from >> PAGE_SHIFT;
+ unsigned offset = from & (PAGE_SIZE-1);
unsigned blocksize;
sector_t iblock;
unsigned length, pos;
@@ -2738,7 +2805,7 @@ int nobh_truncate_page(struct address_space *mapping,
return 0;
length = blocksize - length;
- iblock = (sector_t)index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ iblock = (sector_t)index << (PAGE_SHIFT - inode->i_blkbits);
page = grab_cache_page(mapping, index);
err = -ENOMEM;
@@ -2748,7 +2815,7 @@ int nobh_truncate_page(struct address_space *mapping,
if (page_has_buffers(page)) {
has_buffers:
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
return block_truncate_page(mapping, from, get_block);
}
@@ -2772,7 +2839,7 @@ has_buffers:
if (!PageUptodate(page)) {
err = mapping->a_ops->readpage(NULL, page);
if (err) {
- page_cache_release(page);
+ put_page(page);
goto out;
}
lock_page(page);
@@ -2789,7 +2856,7 @@ has_buffers:
unlock:
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
out:
return err;
}
@@ -2798,8 +2865,8 @@ EXPORT_SYMBOL(nobh_truncate_page);
int block_truncate_page(struct address_space *mapping,
loff_t from, get_block_t *get_block)
{
- pgoff_t index = from >> PAGE_CACHE_SHIFT;
- unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ pgoff_t index = from >> PAGE_SHIFT;
+ unsigned offset = from & (PAGE_SIZE-1);
unsigned blocksize;
sector_t iblock;
unsigned length, pos;
@@ -2816,7 +2883,7 @@ int block_truncate_page(struct address_space *mapping,
return 0;
length = blocksize - length;
- iblock = (sector_t)index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ iblock = (sector_t)index << (PAGE_SHIFT - inode->i_blkbits);
page = grab_cache_page(mapping, index);
err = -ENOMEM;
@@ -2852,7 +2919,7 @@ int block_truncate_page(struct address_space *mapping,
if (!buffer_uptodate(bh) && !buffer_delay(bh) && !buffer_unwritten(bh)) {
err = -EIO;
- ll_rw_block(READ, 1, &bh);
+ ll_rw_block(REQ_OP_READ, 0, 1, &bh);
wait_on_buffer(bh);
/* Uhhuh. Read error. Complain and punt. */
if (!buffer_uptodate(bh))
@@ -2865,7 +2932,7 @@ int block_truncate_page(struct address_space *mapping,
unlock:
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
out:
return err;
}
@@ -2879,7 +2946,7 @@ int block_write_full_page(struct page *page, get_block_t *get_block,
{
struct inode * const inode = page->mapping->host;
loff_t i_size = i_size_read(inode);
- const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ const pgoff_t end_index = i_size >> PAGE_SHIFT;
unsigned offset;
/* Is the page fully inside i_size? */
@@ -2888,14 +2955,14 @@ int block_write_full_page(struct page *page, get_block_t *get_block,
end_buffer_async_write);
/* Is the page fully outside i_size? (truncate in progress) */
- offset = i_size & (PAGE_CACHE_SIZE-1);
+ offset = i_size & (PAGE_SIZE-1);
if (page->index >= end_index+1 || !offset) {
/*
* The page may have dirty, unmapped buffers. For example,
* they may have been added in ext3_writepage(). Make them
* freeable here, so the page does not leak.
*/
- do_invalidatepage(page, 0, PAGE_CACHE_SIZE);
+ do_invalidatepage(page, 0, PAGE_SIZE);
unlock_page(page);
return 0; /* don't care */
}
@@ -2907,7 +2974,7 @@ int block_write_full_page(struct page *page, get_block_t *get_block,
* the page size, the remaining memory is zeroed when mapped, and
* writes to that region are not written out to the file."
*/
- zero_user_segment(page, offset, PAGE_CACHE_SIZE);
+ zero_user_segment(page, offset, PAGE_SIZE);
return __block_write_full_page(inode, page, get_block, wbc,
end_buffer_async_write);
}
@@ -2949,7 +3016,7 @@ static void end_bio_bh_io_sync(struct bio *bio)
* errors, this only handles the "we need to be able to
* do IO at the final sector" case.
*/
-void guard_bio_eod(int rw, struct bio *bio)
+void guard_bio_eod(int op, struct bio *bio)
{
sector_t maxsector;
struct bio_vec *bvec = &bio->bi_io_vec[bio->bi_vcnt - 1];
@@ -2979,13 +3046,13 @@ void guard_bio_eod(int rw, struct bio *bio)
bvec->bv_len -= truncated_bytes;
/* ..and clear the end of the buffer for reads */
- if ((rw & RW_MASK) == READ) {
+ if (op == REQ_OP_READ) {
zero_user(bvec->bv_page, bvec->bv_offset + bvec->bv_len,
truncated_bytes);
}
}
-static int submit_bh_wbc(int rw, struct buffer_head *bh,
+static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
unsigned long bio_flags, struct writeback_control *wbc)
{
struct bio *bio;
@@ -2999,7 +3066,7 @@ static int submit_bh_wbc(int rw, struct buffer_head *bh,
/*
* Only clear out a write error when rewriting
*/
- if (test_set_buffer_req(bh) && (rw & WRITE))
+ if (test_set_buffer_req(bh) && (op == REQ_OP_WRITE))
clear_buffer_write_io_error(bh);
/*
@@ -3024,39 +3091,42 @@ static int submit_bh_wbc(int rw, struct buffer_head *bh,
bio->bi_flags |= bio_flags;
/* Take care of bh's that straddle the end of the device */
- guard_bio_eod(rw, bio);
+ guard_bio_eod(op, bio);
if (buffer_meta(bh))
- rw |= REQ_META;
+ op_flags |= REQ_META;
if (buffer_prio(bh))
- rw |= REQ_PRIO;
+ op_flags |= REQ_PRIO;
+ bio_set_op_attrs(bio, op, op_flags);
- submit_bio(rw, bio);
+ submit_bio(bio);
return 0;
}
-int _submit_bh(int rw, struct buffer_head *bh, unsigned long bio_flags)
+int _submit_bh(int op, int op_flags, struct buffer_head *bh,
+ unsigned long bio_flags)
{
- return submit_bh_wbc(rw, bh, bio_flags, NULL);
+ return submit_bh_wbc(op, op_flags, bh, bio_flags, NULL);
}
EXPORT_SYMBOL_GPL(_submit_bh);
-int submit_bh(int rw, struct buffer_head *bh)
+int submit_bh(int op, int op_flags, struct buffer_head *bh)
{
- return submit_bh_wbc(rw, bh, 0, NULL);
+ return submit_bh_wbc(op, op_flags, bh, 0, NULL);
}
EXPORT_SYMBOL(submit_bh);
/**
* ll_rw_block: low-level access to block devices (DEPRECATED)
- * @rw: whether to %READ or %WRITE or maybe %READA (readahead)
+ * @op: whether to %READ or %WRITE
+ * @op_flags: rq_flag_bits
* @nr: number of &struct buffer_heads in the array
* @bhs: array of pointers to &struct buffer_head
*
* ll_rw_block() takes an array of pointers to &struct buffer_heads, and
- * requests an I/O operation on them, either a %READ or a %WRITE. The third
- * %READA option is described in the documentation for generic_make_request()
- * which ll_rw_block() calls.
+ * requests an I/O operation on them, either a %REQ_OP_READ or a %REQ_OP_WRITE.
+ * @op_flags contains flags modifying the detailed I/O behavior, most notably
+ * %REQ_RAHEAD.
*
* This function drops any buffer that it cannot get a lock on (with the
* BH_Lock state bit), any buffer that appears to be clean when doing a write
@@ -3072,7 +3142,7 @@ EXPORT_SYMBOL(submit_bh);
* All of the buffers must be for the same device, and must also be a
* multiple of the current approved size for the device.
*/
-void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
+void ll_rw_block(int op, int op_flags, int nr, struct buffer_head *bhs[])
{
int i;
@@ -3081,18 +3151,18 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
if (!trylock_buffer(bh))
continue;
- if (rw == WRITE) {
+ if (op == WRITE) {
if (test_clear_buffer_dirty(bh)) {
bh->b_end_io = end_buffer_write_sync;
get_bh(bh);
- submit_bh(WRITE, bh);
+ submit_bh(op, op_flags, bh);
continue;
}
} else {
if (!buffer_uptodate(bh)) {
bh->b_end_io = end_buffer_read_sync;
get_bh(bh);
- submit_bh(rw, bh);
+ submit_bh(op, op_flags, bh);
continue;
}
}
@@ -3101,7 +3171,7 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
}
EXPORT_SYMBOL(ll_rw_block);
-void write_dirty_buffer(struct buffer_head *bh, int rw)
+void write_dirty_buffer(struct buffer_head *bh, int op_flags)
{
lock_buffer(bh);
if (!test_clear_buffer_dirty(bh)) {
@@ -3110,7 +3180,7 @@ void write_dirty_buffer(struct buffer_head *bh, int rw)
}
bh->b_end_io = end_buffer_write_sync;
get_bh(bh);
- submit_bh(rw, bh);
+ submit_bh(REQ_OP_WRITE, op_flags, bh);
}
EXPORT_SYMBOL(write_dirty_buffer);
@@ -3119,7 +3189,7 @@ EXPORT_SYMBOL(write_dirty_buffer);
* and then start new I/O and then wait upon it. The caller must have a ref on
* the buffer_head.
*/
-int __sync_dirty_buffer(struct buffer_head *bh, int rw)
+int __sync_dirty_buffer(struct buffer_head *bh, int op_flags)
{
int ret = 0;
@@ -3128,7 +3198,7 @@ int __sync_dirty_buffer(struct buffer_head *bh, int rw)
if (test_clear_buffer_dirty(bh)) {
get_bh(bh);
bh->b_end_io = end_buffer_write_sync;
- ret = submit_bh(rw, bh);
+ ret = submit_bh(REQ_OP_WRITE, op_flags, bh);
wait_on_buffer(bh);
if (!ret && !buffer_uptodate(bh))
ret = -EIO;
@@ -3391,7 +3461,7 @@ int bh_submit_read(struct buffer_head *bh)
get_bh(bh);
bh->b_end_io = end_buffer_read_sync;
- submit_bh(READ, bh);
+ submit_bh(REQ_OP_READ, 0, bh);
wait_on_buffer(bh);
if (buffer_uptodate(bh))
return 0;
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