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提交 4e7ea81d 编写于 作者: J Jan Kara 提交者： Theodore Ts'o
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ext4: restructure writeback path 

There are two issues with current writeback path in ext4.  For one we
don't necessarily map complete pages when blocksize < pagesize and
thus needn't do any writeback in one iteration.  We always map some
blocks though so we will eventually finish mapping the page.  Just if
writeback races with other operations on the file, forward progress is
not really guaranteed. The second problem is that current code
structure makes it hard to associate all the bios to some range of
pages with one io_end structure so that unwritten extents can be
converted after all the bios are finished.  This will be especially
difficult later when io_end will be associated with reserved
transaction handle.

We restructure the writeback path to a relatively simple loop which
first prepares extent of pages, then maps one or more extents so that
no page is partially mapped, and once page is fully mapped it is
submitted for IO. We keep all the mapping and IO submission
information in mpage_da_data structure to somewhat reduce stack usage.
Resulting code is somewhat shorter than the old one and hopefully also
easier to read.
Reviewed-by: NZheng Liu <wenqing.lz@taobao.com>
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
上级 fffb2739
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fs/ext4/ext4.h
浏览文件 @ 4e7ea81d
...@@ -176,21 +176,6 @@ struct ext4_map_blocks { ...@@ -176,21 +176,6 @@ struct ext4_map_blocks {
unsigned int m_flags; unsigned int m_flags;
}; };
/*
* For delayed allocation tracking
*/
struct mpage_da_data {
struct inode *inode;
sector_t b_blocknr; /* start block number of extent */
size_t b_size; /* size of extent */
unsigned long b_state; /* state of the extent */
unsigned long first_page, next_page; /* extent of pages */
struct writeback_control *wbc;
int io_done;
int pages_written;
int retval;
};
/* /*
* Flags for ext4_io_end->flags * Flags for ext4_io_end->flags
*/ */
......
fs/ext4/inode.c
浏览文件 @ 4e7ea81d
...@@ -1407,149 +1407,42 @@ static void ext4_da_page_release_reservation(struct page *page, ...@@ -1407,149 +1407,42 @@ static void ext4_da_page_release_reservation(struct page *page,
* Delayed allocation stuff * Delayed allocation stuff
*/ */
static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd); struct mpage_da_data {
struct inode *inode;
/* struct writeback_control *wbc;
* mpage_da_submit_io - walks through extent of pages and try to write pgoff_t first_page; /* The first page to write */
* them with writepage() call back pgoff_t next_page; /* Current page to examine */
* pgoff_t last_page; /* Last page to examine */
* @mpd->inode: inode
* @mpd->first_page: first page of the extent
* @mpd->next_page: page after the last page of the extent
*
* By the time mpage_da_submit_io() is called we expect all blocks
* to be allocated. this may be wrong if allocation failed.
*
* As pages are already locked by write_cache_pages(), we can't use it
*/
static int mpage_da_submit_io(struct mpage_da_data *mpd,
struct ext4_map_blocks *map)
{
struct pagevec pvec;
unsigned long index, end;
int ret = 0, err, nr_pages, i;
struct inode *inode = mpd->inode;
struct address_space *mapping = inode->i_mapping;
loff_t size = i_size_read(inode);
unsigned int len, block_start;
struct buffer_head *bh, *page_bufs = NULL;
sector_t pblock = 0, cur_logical = 0;
struct ext4_io_submit io_submit;
BUG_ON(mpd->next_page <= mpd->first_page);
ext4_io_submit_init(&io_submit, mpd->wbc);
io_submit.io_end = ext4_init_io_end(inode, GFP_NOFS);
if (!io_submit.io_end) {
ext4_da_block_invalidatepages(mpd);
return -ENOMEM;
}
/*
* We need to start from the first_page to the next_page - 1
* to make sure we also write the mapped dirty buffer_heads.
* If we look at mpd->b_blocknr we would only be looking
* at the currently mapped buffer_heads.
*/
index = mpd->first_page;
end = mpd->next_page - 1;
pagevec_init(&pvec, 0);
while (index <= end) {
nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE);
if (nr_pages == 0)
break;
for (i = 0; i < nr_pages; i++) {
int skip_page = 0;
struct page *page = pvec.pages[i];
index = page->index;
if (index > end)
break;
if (index == size >> PAGE_CACHE_SHIFT)
len = size & ~PAGE_CACHE_MASK;
else
len = PAGE_CACHE_SIZE;
if (map) {
cur_logical = index << (PAGE_CACHE_SHIFT -
inode->i_blkbits);
pblock = map->m_pblk + (cur_logical -
map->m_lblk);
}
index++;
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
bh = page_bufs = page_buffers(page);
block_start = 0;
do {
if (map && (cur_logical >= map->m_lblk) &&
(cur_logical <= (map->m_lblk +
(map->m_len - 1)))) {
if (buffer_delay(bh)) {
clear_buffer_delay(bh);
bh->b_blocknr = pblock;
}
if (buffer_unwritten(bh) ||
buffer_mapped(bh))
BUG_ON(bh->b_blocknr != pblock);
if (map->m_flags & EXT4_MAP_UNINIT)
set_buffer_uninit(bh);
clear_buffer_unwritten(bh);
}
/*
* skip page if block allocation undone and
* block is dirty
*/
if (ext4_bh_delay_or_unwritten(NULL, bh))
skip_page = 1;
bh = bh->b_this_page;
block_start += bh->b_size;
cur_logical++;
pblock++;
} while (bh != page_bufs);
if (skip_page) {
unlock_page(page);
continue;
}
clear_page_dirty_for_io(page);
err = ext4_bio_write_page(&io_submit, page, len,
mpd->wbc);
if (!err)
mpd->pages_written++;
/* /*
* In error case, we have to continue because * Extent to map - this can be after first_page because that can be
* remaining pages are still locked * fully mapped. We somewhat abuse m_flags to store whether the extent
* is delalloc or unwritten.
*/ */
if (ret == 0) struct ext4_map_blocks map;
ret = err; struct ext4_io_submit io_submit; /* IO submission data */
} };
pagevec_release(&pvec);
}
ext4_io_submit(&io_submit);
/* Drop io_end reference we got from init */
ext4_put_io_end_defer(io_submit.io_end);
return ret;
}
static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd) static void mpage_release_unused_pages(struct mpage_da_data *mpd,
bool invalidate)
{ {
int nr_pages, i; int nr_pages, i;
pgoff_t index, end; pgoff_t index, end;
struct pagevec pvec; struct pagevec pvec;
struct inode *inode = mpd->inode; struct inode *inode = mpd->inode;
struct address_space *mapping = inode->i_mapping; struct address_space *mapping = inode->i_mapping;
ext4_lblk_t start, last;
/* This is necessary when next_page == 0. */
if (mpd->first_page >= mpd->next_page)
return;
index = mpd->first_page; index = mpd->first_page;
end = mpd->next_page - 1; end = mpd->next_page - 1;
if (invalidate) {
ext4_lblk_t start, last;
start = index << (PAGE_CACHE_SHIFT - inode->i_blkbits); start = index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
last = end << (PAGE_CACHE_SHIFT - inode->i_blkbits); last = end << (PAGE_CACHE_SHIFT - inode->i_blkbits);
ext4_es_remove_extent(inode, start, last - start + 1); ext4_es_remove_extent(inode, start, last - start + 1);
}
pagevec_init(&pvec, 0); pagevec_init(&pvec, 0);
while (index <= end) { while (index <= end) {
...@@ -1562,14 +1455,15 @@ static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd) ...@@ -1562,14 +1455,15 @@ static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd)
break; break;
BUG_ON(!PageLocked(page)); BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page)); BUG_ON(PageWriteback(page));
if (invalidate) {
block_invalidatepage(page, 0, PAGE_CACHE_SIZE); block_invalidatepage(page, 0, PAGE_CACHE_SIZE);
ClearPageUptodate(page); ClearPageUptodate(page);
}
unlock_page(page); unlock_page(page);
} }
index = pvec.pages[nr_pages - 1]->index + 1; index = pvec.pages[nr_pages - 1]->index + 1;
pagevec_release(&pvec); pagevec_release(&pvec);
} }
return;
} }
static void ext4_print_free_blocks(struct inode *inode) static void ext4_print_free_blocks(struct inode *inode)
...@@ -1598,215 +1492,6 @@ static void ext4_print_free_blocks(struct inode *inode) ...@@ -1598,215 +1492,6 @@ static void ext4_print_free_blocks(struct inode *inode)
return; return;
} }
/*
* mpage_da_map_and_submit - go through given space, map them
* if necessary, and then submit them for I/O
*
* @mpd - bh describing space
*
* The function skips space we know is already mapped to disk blocks.
*
*/
static void mpage_da_map_and_submit(struct mpage_da_data *mpd)
{
int err, blks, get_blocks_flags;
struct ext4_map_blocks map, *mapp = NULL;
sector_t next = mpd->b_blocknr;
unsigned max_blocks = mpd->b_size >> mpd->inode->i_blkbits;
loff_t disksize = EXT4_I(mpd->inode)->i_disksize;
handle_t *handle = NULL;
/*
* If the blocks are mapped already, or we couldn't accumulate
* any blocks, then proceed immediately to the submission stage.
*/
if ((mpd->b_size == 0) ||
((mpd->b_state & (1 << BH_Mapped)) &&
!(mpd->b_state & (1 << BH_Delay)) &&
!(mpd->b_state & (1 << BH_Unwritten))))
goto submit_io;
handle = ext4_journal_current_handle();
BUG_ON(!handle);
/*
* Call ext4_map_blocks() to allocate any delayed allocation
* blocks, or to convert an uninitialized extent to be
* initialized (in the case where we have written into
* one or more preallocated blocks).
*
* We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE to
* indicate that we are on the delayed allocation path. This
* affects functions in many different parts of the allocation
* call path. This flag exists primarily because we don't
* want to change *many* call functions, so ext4_map_blocks()
* will set the EXT4_STATE_DELALLOC_RESERVED flag once the
* inode's allocation semaphore is taken.
*
* If the blocks in questions were delalloc blocks, set
* EXT4_GET_BLOCKS_DELALLOC_RESERVE so the delalloc accounting
* variables are updated after the blocks have been allocated.
*/
map.m_lblk = next;
map.m_len = max_blocks;
/*
* We're in delalloc path and it is possible that we're going to
* need more metadata blocks than previously reserved. However
* we must not fail because we're in writeback and there is
* nothing we can do about it so it might result in data loss.
* So use reserved blocks to allocate metadata if possible.
*/
get_blocks_flags = EXT4_GET_BLOCKS_CREATE |
EXT4_GET_BLOCKS_METADATA_NOFAIL;
if (ext4_should_dioread_nolock(mpd->inode))
get_blocks_flags |= EXT4_GET_BLOCKS_IO_CREATE_EXT;
if (mpd->b_state & (1 << BH_Delay))
get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE;
blks = ext4_map_blocks(handle, mpd->inode, &map, get_blocks_flags);
if (blks < 0) {
struct super_block *sb = mpd->inode->i_sb;
err = blks;
/*
* If get block returns EAGAIN or ENOSPC and there
* appears to be free blocks we will just let
* mpage_da_submit_io() unlock all of the pages.
*/
if (err == -EAGAIN)
goto submit_io;
if (err == -ENOSPC && ext4_count_free_clusters(sb)) {
mpd->retval = err;
goto submit_io;
}
/*
* get block failure will cause us to loop in
* writepages, because a_ops->writepage won't be able
* to make progress. The page will be redirtied by
* writepage and writepages will again try to write
* the same.
*/
if (!(EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)) {
ext4_msg(sb, KERN_CRIT,
"delayed block allocation failed for inode %lu "
"at logical offset %llu with max blocks %zd "
"with error %d", mpd->inode->i_ino,
(unsigned long long) next,
mpd->b_size >> mpd->inode->i_blkbits, err);
ext4_msg(sb, KERN_CRIT,
"This should not happen!! Data will be lost");
if (err == -ENOSPC)
ext4_print_free_blocks(mpd->inode);
}
/* invalidate all the pages */
ext4_da_block_invalidatepages(mpd);
/* Mark this page range as having been completed */
mpd->io_done = 1;
return;
}
BUG_ON(blks == 0);
mapp = &map;
if (map.m_flags & EXT4_MAP_NEW) {
struct block_device *bdev = mpd->inode->i_sb->s_bdev;
int i;
for (i = 0; i < map.m_len; i++)
unmap_underlying_metadata(bdev, map.m_pblk + i);
}
/*
* Update on-disk size along with block allocation.
*/
disksize = ((loff_t) next + blks) << mpd->inode->i_blkbits;
if (disksize > i_size_read(mpd->inode))
disksize = i_size_read(mpd->inode);
if (disksize > EXT4_I(mpd->inode)->i_disksize) {
ext4_update_i_disksize(mpd->inode, disksize);
err = ext4_mark_inode_dirty(handle, mpd->inode);
if (err)
ext4_error(mpd->inode->i_sb,
"Failed to mark inode %lu dirty",
mpd->inode->i_ino);
}
submit_io:
mpage_da_submit_io(mpd, mapp);
mpd->io_done = 1;
}
#define BH_FLAGS ((1 << BH_Uptodate) | (1 << BH_Mapped) | \
(1 << BH_Delay) | (1 << BH_Unwritten))
/*
* mpage_add_bh_to_extent - try to add one more block to extent of blocks
*
* @mpd->lbh - extent of blocks
* @logical - logical number of the block in the file
* @b_state - b_state of the buffer head added
*
* the function is used to collect contig. blocks in same state
*/
static void mpage_add_bh_to_extent(struct mpage_da_data *mpd, sector_t logical,
unsigned long b_state)
{
sector_t next;
int blkbits = mpd->inode->i_blkbits;
int nrblocks = mpd->b_size >> blkbits;
/*
* XXX Don't go larger than mballoc is willing to allocate
* This is a stopgap solution. We eventually need to fold
* mpage_da_submit_io() into this function and then call
* ext4_map_blocks() multiple times in a loop
*/
if (nrblocks >= (8*1024*1024 >> blkbits))
goto flush_it;
/* check if the reserved journal credits might overflow */
if (!ext4_test_inode_flag(mpd->inode, EXT4_INODE_EXTENTS)) {
if (nrblocks >= EXT4_MAX_TRANS_DATA) {
/*
* With non-extent format we are limited by the journal
* credit available. Total credit needed to insert
* nrblocks contiguous blocks is dependent on the
* nrblocks. So limit nrblocks.
*/
goto flush_it;
}
}
/*
* First block in the extent
*/
if (mpd->b_size == 0) {
mpd->b_blocknr = logical;
mpd->b_size = 1 << blkbits;
mpd->b_state = b_state & BH_FLAGS;
return;
}
next = mpd->b_blocknr + nrblocks;
/*
* Can we merge the block to our big extent?
*/
if (logical == next && (b_state & BH_FLAGS) == mpd->b_state) {
mpd->b_size += 1 << blkbits;
return;
}
flush_it:
/*
* We couldn't merge the block to our extent, so we
* need to flush current extent and start new one
*/
mpage_da_map_and_submit(mpd);
return;
}
static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh) static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh)
{ {
return (buffer_delay(bh) || buffer_unwritten(bh)) && buffer_dirty(bh); return (buffer_delay(bh) || buffer_unwritten(bh)) && buffer_dirty(bh);
...@@ -2204,6 +1889,8 @@ static int ext4_writepage(struct page *page, ...@@ -2204,6 +1889,8 @@ static int ext4_writepage(struct page *page,
return ret; return ret;
} }
#define BH_FLAGS ((1 << BH_Unwritten) | (1 << BH_Delay))
/* /*
* mballoc gives us at most this number of blocks... * mballoc gives us at most this number of blocks...
* XXX: That seems to be only a limitation of ext4_mb_normalize_request(). * XXX: That seems to be only a limitation of ext4_mb_normalize_request().
...@@ -2211,6 +1898,315 @@ static int ext4_writepage(struct page *page, ...@@ -2211,6 +1898,315 @@ static int ext4_writepage(struct page *page,
*/ */
#define MAX_WRITEPAGES_EXTENT_LEN 2048 #define MAX_WRITEPAGES_EXTENT_LEN 2048
/*
* mpage_add_bh_to_extent - try to add bh to extent of blocks to map
*
* @mpd - extent of blocks
* @lblk - logical number of the block in the file
* @b_state - b_state of the buffer head added
*
* the function is used to collect contig. blocks in same state
*/
static int mpage_add_bh_to_extent(struct mpage_da_data *mpd, ext4_lblk_t lblk,
unsigned long b_state)
{
struct ext4_map_blocks *map = &mpd->map;
/* Don't go larger than mballoc is willing to allocate */
if (map->m_len >= MAX_WRITEPAGES_EXTENT_LEN)
return 0;
/* First block in the extent? */
if (map->m_len == 0) {
map->m_lblk = lblk;
map->m_len = 1;
map->m_flags = b_state & BH_FLAGS;
return 1;
}
/* Can we merge the block to our big extent? */
if (lblk == map->m_lblk + map->m_len &&
(b_state & BH_FLAGS) == map->m_flags) {
map->m_len++;
return 1;
}
return 0;
}
static bool add_page_bufs_to_extent(struct mpage_da_data *mpd,
struct buffer_head *head,
struct buffer_head *bh,
ext4_lblk_t lblk)
{
struct inode *inode = mpd->inode;
ext4_lblk_t blocks = (i_size_read(inode) + (1 << inode->i_blkbits) - 1)
>> inode->i_blkbits;
do {
BUG_ON(buffer_locked(bh));
if (!buffer_dirty(bh) || !buffer_mapped(bh) ||
(!buffer_delay(bh) && !buffer_unwritten(bh)) ||
lblk >= blocks) {
/* Found extent to map? */
if (mpd->map.m_len)
return false;
if (lblk >= blocks)
return true;
continue;
}
if (!mpage_add_bh_to_extent(mpd, lblk, bh->b_state))
return false;
} while (lblk++, (bh = bh->b_this_page) != head);
return true;
}
static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)
{
int len;
loff_t size = i_size_read(mpd->inode);
int err;
BUG_ON(page->index != mpd->first_page);
if (page->index == size >> PAGE_CACHE_SHIFT)
len = size & ~PAGE_CACHE_MASK;
else
len = PAGE_CACHE_SIZE;
clear_page_dirty_for_io(page);
err = ext4_bio_write_page(&mpd->io_submit, page, len, mpd->wbc);
if (!err)
mpd->wbc->nr_to_write--;
mpd->first_page++;
return err;
}
/*
* mpage_map_buffers - update buffers corresponding to changed extent and
* submit fully mapped pages for IO
*
* @mpd - description of extent to map, on return next extent to map
*
* Scan buffers corresponding to changed extent (we expect corresponding pages
* to be already locked) and update buffer state according to new extent state.
* We map delalloc buffers to their physical location, clear unwritten bits,
* and mark buffers as uninit when we perform writes to uninitialized extents
* and do extent conversion after IO is finished. If the last page is not fully
* mapped, we update @map to the next extent in the last page that needs
* mapping. Otherwise we submit the page for IO.
*/
static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
{
struct pagevec pvec;
int nr_pages, i;
struct inode *inode = mpd->inode;
struct buffer_head *head, *bh;
int bpp_bits = PAGE_CACHE_SHIFT - inode->i_blkbits;
ext4_lblk_t blocks = (i_size_read(inode) + (1 << inode->i_blkbits) - 1)
>> inode->i_blkbits;
pgoff_t start, end;
ext4_lblk_t lblk;
sector_t pblock;
int err;
start = mpd->map.m_lblk >> bpp_bits;
end = (mpd->map.m_lblk + mpd->map.m_len - 1) >> bpp_bits;
lblk = start << bpp_bits;
pblock = mpd->map.m_pblk;
pagevec_init(&pvec, 0);
while (start <= end) {
nr_pages = pagevec_lookup(&pvec, inode->i_mapping, start,
PAGEVEC_SIZE);
if (nr_pages == 0)
break;
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
if (page->index > end)
break;
/* Upto 'end' pages must be contiguous */
BUG_ON(page->index != start);
bh = head = page_buffers(page);
do {
if (lblk < mpd->map.m_lblk)
continue;
if (lblk >= mpd->map.m_lblk + mpd->map.m_len) {
/*
* Buffer after end of mapped extent.
* Find next buffer in the page to map.
*/
mpd->map.m_len = 0;
mpd->map.m_flags = 0;
add_page_bufs_to_extent(mpd, head, bh,
lblk);
pagevec_release(&pvec);
return 0;
}
if (buffer_delay(bh)) {
clear_buffer_delay(bh);
bh->b_blocknr = pblock++;
}
if (mpd->map.m_flags & EXT4_MAP_UNINIT)
set_buffer_uninit(bh);
clear_buffer_unwritten(bh);
} while (++lblk < blocks &&
(bh = bh->b_this_page) != head);
/*
* FIXME: This is going to break if dioread_nolock
* supports blocksize < pagesize as we will try to
* convert potentially unmapped parts of inode.
*/
mpd->io_submit.io_end->size += PAGE_CACHE_SIZE;
/* Page fully mapped - let IO run! */
err = mpage_submit_page(mpd, page);
if (err < 0) {
pagevec_release(&pvec);
return err;
}
start++;
}
pagevec_release(&pvec);
}
/* Extent fully mapped and matches with page boundary. We are done. */
mpd->map.m_len = 0;
mpd->map.m_flags = 0;
return 0;
}
static int mpage_map_one_extent(handle_t *handle, struct mpage_da_data *mpd)
{
struct inode *inode = mpd->inode;
struct ext4_map_blocks *map = &mpd->map;
int get_blocks_flags;
int err;
trace_ext4_da_write_pages_extent(inode, map);
/*
* Call ext4_map_blocks() to allocate any delayed allocation blocks, or
* to convert an uninitialized extent to be initialized (in the case
* where we have written into one or more preallocated blocks). It is
* possible that we're going to need more metadata blocks than
* previously reserved. However we must not fail because we're in
* writeback and there is nothing we can do about it so it might result
* in data loss. So use reserved blocks to allocate metadata if
* possible.
*
* We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE if the blocks
* in question are delalloc blocks. This affects functions in many
* different parts of the allocation call path. This flag exists
* primarily because we don't want to change *many* call functions, so
* ext4_map_blocks() will set the EXT4_STATE_DELALLOC_RESERVED flag
* once the inode's allocation semaphore is taken.
*/
get_blocks_flags = EXT4_GET_BLOCKS_CREATE |
EXT4_GET_BLOCKS_METADATA_NOFAIL;
if (ext4_should_dioread_nolock(inode))
get_blocks_flags |= EXT4_GET_BLOCKS_IO_CREATE_EXT;
if (map->m_flags & (1 << BH_Delay))
get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE;
err = ext4_map_blocks(handle, inode, map, get_blocks_flags);
if (err < 0)
return err;
BUG_ON(map->m_len == 0);
if (map->m_flags & EXT4_MAP_NEW) {
struct block_device *bdev = inode->i_sb->s_bdev;
int i;
for (i = 0; i < map->m_len; i++)
unmap_underlying_metadata(bdev, map->m_pblk + i);
}
return 0;
}
/*
* mpage_map_and_submit_extent - map extent starting at mpd->lblk of length
* mpd->len and submit pages underlying it for IO
*
* @handle - handle for journal operations
* @mpd - extent to map
*
* The function maps extent starting at mpd->lblk of length mpd->len. If it is
* delayed, blocks are allocated, if it is unwritten, we may need to convert
* them to initialized or split the described range from larger unwritten
* extent. Note that we need not map all the described range since allocation
* can return less blocks or the range is covered by more unwritten extents. We
* cannot map more because we are limited by reserved transaction credits. On
* the other hand we always make sure that the last touched page is fully
* mapped so that it can be written out (and thus forward progress is
* guaranteed). After mapping we submit all mapped pages for IO.
*/
static int mpage_map_and_submit_extent(handle_t *handle,
struct mpage_da_data *mpd)
{
struct inode *inode = mpd->inode;
struct ext4_map_blocks *map = &mpd->map;
int err;
loff_t disksize;
mpd->io_submit.io_end->offset =
((loff_t)map->m_lblk) << inode->i_blkbits;
while (map->m_len) {
err = mpage_map_one_extent(handle, mpd);
if (err < 0) {
struct super_block *sb = inode->i_sb;
/*
* Need to commit transaction to free blocks. Let upper
* layers sort it out.
*/
if (err == -ENOSPC && ext4_count_free_clusters(sb))
return -ENOSPC;
if (!(EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)) {
ext4_msg(sb, KERN_CRIT,
"Delayed block allocation failed for "
"inode %lu at logical offset %llu with"
" max blocks %u with error %d",
inode->i_ino,
(unsigned long long)map->m_lblk,
(unsigned)map->m_len, err);
ext4_msg(sb, KERN_CRIT,
"This should not happen!! Data will "
"be lost\n");
if (err == -ENOSPC)
ext4_print_free_blocks(inode);
}
/* invalidate all the pages */
mpage_release_unused_pages(mpd, true);
return err;
}
/*
* Update buffer state, submit mapped pages, and get us new
* extent to map
*/
err = mpage_map_and_submit_buffers(mpd);
if (err < 0)
return err;
}
/* Update on-disk size after IO is submitted */
disksize = ((loff_t)mpd->first_page) << PAGE_CACHE_SHIFT;
if (disksize > i_size_read(inode))
disksize = i_size_read(inode);
if (disksize > EXT4_I(inode)->i_disksize) {
int err2;
ext4_update_i_disksize(inode, disksize);
err2 = ext4_mark_inode_dirty(handle, inode);
if (err2)
ext4_error(inode->i_sb,
"Failed to mark inode %lu dirty",
inode->i_ino);
if (!err)
err = err2;
}
return err;
}
/* /*
* Calculate the total number of credits to reserve for one writepages * Calculate the total number of credits to reserve for one writepages
* iteration. This is called from ext4_da_writepages(). We map an extent of * iteration. This is called from ext4_da_writepages(). We map an extent of
...@@ -2227,44 +2223,49 @@ static int ext4_da_writepages_trans_blocks(struct inode *inode) ...@@ -2227,44 +2223,49 @@ static int ext4_da_writepages_trans_blocks(struct inode *inode)
} }
/* /*
* write_cache_pages_da - walk the list of dirty pages of the given * mpage_prepare_extent_to_map - find & lock contiguous range of dirty pages
* address space and accumulate pages that need writing, and call * and underlying extent to map
* mpage_da_map_and_submit to map a single contiguous memory region *
* and then write them. * @mpd - where to look for pages
*
* Walk dirty pages in the mapping. If they are fully mapped, submit them for
* IO immediately. When we find a page which isn't mapped we start accumulating
* extent of buffers underlying these pages that needs mapping (formed by
* either delayed or unwritten buffers). We also lock the pages containing
* these buffers. The extent found is returned in @mpd structure (starting at
* mpd->lblk with length mpd->len blocks).
*
* Note that this function can attach bios to one io_end structure which are
* neither logically nor physically contiguous. Although it may seem as an
* unnecessary complication, it is actually inevitable in blocksize < pagesize
* case as we need to track IO to all buffers underlying a page in one io_end.
*/ */
static int write_cache_pages_da(handle_t *handle, static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
struct address_space *mapping,
struct writeback_control *wbc,
struct mpage_da_data *mpd,
pgoff_t *done_index)
{ {
struct buffer_head *bh, *head; struct address_space *mapping = mpd->inode->i_mapping;
struct inode *inode = mapping->host;
struct pagevec pvec; struct pagevec pvec;
unsigned int nr_pages; unsigned int nr_pages;
sector_t logical; pgoff_t index = mpd->first_page;
pgoff_t index, end; pgoff_t end = mpd->last_page;
long nr_to_write = wbc->nr_to_write; int tag;
int i, tag, ret = 0; int i, err = 0;
int blkbits = mpd->inode->i_blkbits;
memset(mpd, 0, sizeof(struct mpage_da_data)); ext4_lblk_t lblk;
mpd->wbc = wbc; struct buffer_head *head;
mpd->inode = inode;
pagevec_init(&pvec, 0);
index = wbc->range_start >> PAGE_CACHE_SHIFT;
end = wbc->range_end >> PAGE_CACHE_SHIFT;
if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) if (mpd->wbc->sync_mode == WB_SYNC_ALL || mpd->wbc->tagged_writepages)
tag = PAGECACHE_TAG_TOWRITE; tag = PAGECACHE_TAG_TOWRITE;
else else
tag = PAGECACHE_TAG_DIRTY; tag = PAGECACHE_TAG_DIRTY;
*done_index = index; pagevec_init(&pvec, 0);
mpd->map.m_len = 0;
mpd->next_page = index;
while (index <= end) { while (index <= end) {
nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
if (nr_pages == 0) if (nr_pages == 0)
return 0; goto out;
for (i = 0; i < nr_pages; i++) { for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i]; struct page *page = pvec.pages[i];
...@@ -2279,31 +2280,21 @@ static int write_cache_pages_da(handle_t *handle, ...@@ -2279,31 +2280,21 @@ static int write_cache_pages_da(handle_t *handle,
if (page->index > end) if (page->index > end)
goto out; goto out;
*done_index = page->index + 1; /* If we can't merge this page, we are done. */
if (mpd->map.m_len > 0 && mpd->next_page != page->index)
/* goto out;
* If we can't merge this page, and we have
* accumulated an contiguous region, write it
*/
if ((mpd->next_page != page->index) &&
(mpd->next_page != mpd->first_page)) {
mpage_da_map_and_submit(mpd);
goto ret_extent_tail;
}
lock_page(page); lock_page(page);
/* /*
* If the page is no longer dirty, or its * If the page is no longer dirty, or its mapping no
* mapping no longer corresponds to inode we * longer corresponds to inode we are writing (which
* are writing (which means it has been * means it has been truncated or invalidated), or the
* truncated or invalidated), or the page is * page is already under writeback and we are not doing
* already under writeback and we are not * a data integrity writeback, skip the page
* doing a data integrity writeback, skip the page
*/ */
if (!PageDirty(page) || if (!PageDirty(page) ||
(PageWriteback(page) && (PageWriteback(page) &&
(wbc->sync_mode == WB_SYNC_NONE)) || (mpd->wbc->sync_mode == WB_SYNC_NONE)) ||
unlikely(page->mapping != mapping)) { unlikely(page->mapping != mapping)) {
unlock_page(page); unlock_page(page);
continue; continue;
...@@ -2312,101 +2303,57 @@ static int write_cache_pages_da(handle_t *handle, ...@@ -2312,101 +2303,57 @@ static int write_cache_pages_da(handle_t *handle,
wait_on_page_writeback(page); wait_on_page_writeback(page);
BUG_ON(PageWriteback(page)); BUG_ON(PageWriteback(page));
/* if (mpd->map.m_len == 0)
* If we have inline data and arrive here, it means that
* we will soon create the block for the 1st page, so
* we'd better clear the inline data here.
*/
if (ext4_has_inline_data(inode)) {
BUG_ON(ext4_test_inode_state(inode,
EXT4_STATE_MAY_INLINE_DATA));
ext4_destroy_inline_data(handle, inode);
}
if (mpd->next_page != page->index)
mpd->first_page = page->index; mpd->first_page = page->index;
mpd->next_page = page->index + 1; mpd->next_page = page->index + 1;
logical = (sector_t) page->index <<
(PAGE_CACHE_SHIFT - inode->i_blkbits);
/* Add all dirty buffers to mpd */ /* Add all dirty buffers to mpd */
lblk = ((ext4_lblk_t)page->index) <<
(PAGE_CACHE_SHIFT - blkbits);
head = page_buffers(page); head = page_buffers(page);
bh = head; if (!add_page_bufs_to_extent(mpd, head, head, lblk))
do { goto out;
BUG_ON(buffer_locked(bh)); /* So far everything mapped? Submit the page for IO. */
/* if (mpd->map.m_len == 0) {
* We need to try to allocate unmapped blocks err = mpage_submit_page(mpd, page);
* in the same page. Otherwise we won't make if (err < 0)
* progress with the page in ext4_writepage goto out;
*/ }
if (ext4_bh_delay_or_unwritten(NULL, bh)) {
mpage_add_bh_to_extent(mpd, logical,
bh->b_state);
if (mpd->io_done)
goto ret_extent_tail;
} else if (buffer_dirty(bh) &&
buffer_mapped(bh)) {
/*
* mapped dirty buffer. We need to
* update the b_state because we look
* at b_state in mpage_da_map_blocks.
* We don't update b_size because if we
* find an unmapped buffer_head later
* we need to use the b_state flag of
* that buffer_head.
*/
if (mpd->b_size == 0)
mpd->b_state =
bh->b_state & BH_FLAGS;
}
logical++;
} while ((bh = bh->b_this_page) != head);
if (nr_to_write > 0) {
nr_to_write--;
if (nr_to_write == 0 &&
wbc->sync_mode == WB_SYNC_NONE)
/* /*
* We stop writing back only if we are * Accumulated enough dirty pages? This doesn't apply
* not doing integrity sync. In case of * to WB_SYNC_ALL mode. For integrity sync we have to
* integrity sync we have to keep going * keep going because someone may be concurrently
* because someone may be concurrently * dirtying pages, and we might have synced a lot of
* dirtying pages, and we might have * newly appeared dirty pages, but have not synced all
* synced a lot of newly appeared dirty * of the old dirty pages.
* pages, but have not synced all of the
* old dirty pages.
*/ */
if (mpd->wbc->sync_mode == WB_SYNC_NONE &&
mpd->next_page - mpd->first_page >=
mpd->wbc->nr_to_write)
goto out; goto out;
} }
}
pagevec_release(&pvec); pagevec_release(&pvec);
cond_resched(); cond_resched();
} }
return 0; return 0;
ret_extent_tail:
ret = MPAGE_DA_EXTENT_TAIL;
out: out:
pagevec_release(&pvec); pagevec_release(&pvec);
cond_resched(); return err;
return ret;
} }
static int ext4_da_writepages(struct address_space *mapping, static int ext4_da_writepages(struct address_space *mapping,
struct writeback_control *wbc) struct writeback_control *wbc)
{ {
pgoff_t index; pgoff_t writeback_index = 0;
long nr_to_write = wbc->nr_to_write;
int range_whole = 0; int range_whole = 0;
int cycled = 1;
handle_t *handle = NULL; handle_t *handle = NULL;
struct mpage_da_data mpd; struct mpage_da_data mpd;
struct inode *inode = mapping->host; struct inode *inode = mapping->host;
int pages_written = 0;
int range_cyclic, cycled = 1, io_done = 0;
int needed_blocks, ret = 0; int needed_blocks, ret = 0;
loff_t range_start = wbc->range_start;
struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb); struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb);
pgoff_t done_index = 0; bool done;
pgoff_t end;
struct blk_plug plug; struct blk_plug plug;
trace_ext4_da_writepages(inode, wbc); trace_ext4_da_writepages(inode, wbc);
...@@ -2432,40 +2379,65 @@ static int ext4_da_writepages(struct address_space *mapping, ...@@ -2432,40 +2379,65 @@ static int ext4_da_writepages(struct address_space *mapping,
if (unlikely(sbi->s_mount_flags & EXT4_MF_FS_ABORTED)) if (unlikely(sbi->s_mount_flags & EXT4_MF_FS_ABORTED))
return -EROFS; return -EROFS;
/*
* If we have inline data and arrive here, it means that
* we will soon create the block for the 1st page, so
* we'd better clear the inline data here.
*/
if (ext4_has_inline_data(inode)) {
/* Just inode will be modified... */
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out_writepages;
}
BUG_ON(ext4_test_inode_state(inode,
EXT4_STATE_MAY_INLINE_DATA));
ext4_destroy_inline_data(handle, inode);
ext4_journal_stop(handle);
}
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
range_whole = 1; range_whole = 1;
range_cyclic = wbc->range_cyclic;
if (wbc->range_cyclic) { if (wbc->range_cyclic) {
index = mapping->writeback_index; writeback_index = mapping->writeback_index;
if (index) if (writeback_index)
cycled = 0; cycled = 0;
wbc->range_start = index << PAGE_CACHE_SHIFT; mpd.first_page = writeback_index;
wbc->range_end = LLONG_MAX; mpd.last_page = -1;
wbc->range_cyclic = 0;
end = -1;
} else { } else {
index = wbc->range_start >> PAGE_CACHE_SHIFT; mpd.first_page = wbc->range_start >> PAGE_CACHE_SHIFT;
end = wbc->range_end >> PAGE_CACHE_SHIFT; mpd.last_page = wbc->range_end >> PAGE_CACHE_SHIFT;
} }
mpd.inode = inode;
mpd.wbc = wbc;
ext4_io_submit_init(&mpd.io_submit, wbc);
retry: retry:
if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
tag_pages_for_writeback(mapping, index, end); tag_pages_for_writeback(mapping, mpd.first_page, mpd.last_page);
done = false;
blk_start_plug(&plug); blk_start_plug(&plug);
while (!ret && wbc->nr_to_write > 0) { while (!done && mpd.first_page <= mpd.last_page) {
/* For each extent of pages we use new io_end */
mpd.io_submit.io_end = ext4_init_io_end(inode, GFP_KERNEL);
if (!mpd.io_submit.io_end) {
ret = -ENOMEM;
break;
}
/* /*
* we insert one extent at a time. So we need * We have two constraints: We find one extent to map and we
* credit needed for single extent allocation. * must always write out whole page (makes a difference when
* journalled mode is currently not supported * blocksize < pagesize) so that we don't block on IO when we
* by delalloc * try to write out the rest of the page. Journalled mode is
* not supported by delalloc.
*/ */
BUG_ON(ext4_should_journal_data(inode)); BUG_ON(ext4_should_journal_data(inode));
needed_blocks = ext4_da_writepages_trans_blocks(inode); needed_blocks = ext4_da_writepages_trans_blocks(inode);
/* start a new transaction*/ /* start a new transaction */
handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE,
needed_blocks); needed_blocks);
if (IS_ERR(handle)) { if (IS_ERR(handle)) {
...@@ -2473,76 +2445,67 @@ static int ext4_da_writepages(struct address_space *mapping, ...@@ -2473,76 +2445,67 @@ static int ext4_da_writepages(struct address_space *mapping,
ext4_msg(inode->i_sb, KERN_CRIT, "%s: jbd2_start: " ext4_msg(inode->i_sb, KERN_CRIT, "%s: jbd2_start: "
"%ld pages, ino %lu; err %d", __func__, "%ld pages, ino %lu; err %d", __func__,
wbc->nr_to_write, inode->i_ino, ret); wbc->nr_to_write, inode->i_ino, ret);
blk_finish_plug(&plug); /* Release allocated io_end */
goto out_writepages; ext4_put_io_end(mpd.io_submit.io_end);
break;
} }
trace_ext4_da_write_pages(inode, mpd.first_page, mpd.wbc);
ret = mpage_prepare_extent_to_map(&mpd);
if (!ret) {
if (mpd.map.m_len)
ret = mpage_map_and_submit_extent(handle, &mpd);
else {
/* /*
* Now call write_cache_pages_da() to find the next * We scanned the whole range (or exhausted
* contiguous region of logical blocks that need * nr_to_write), submitted what was mapped and
* blocks to be allocated by ext4 and submit them. * didn't find anything needing mapping. We are
*/ * done.
ret = write_cache_pages_da(handle, mapping,
wbc, &mpd, &done_index);
/*
* If we have a contiguous extent of pages and we
* haven't done the I/O yet, map the blocks and submit
* them for I/O.
*/ */
if (!mpd.io_done && mpd.next_page != mpd.first_page) { done = true;
mpage_da_map_and_submit(&mpd); }
ret = MPAGE_DA_EXTENT_TAIL;
} }
trace_ext4_da_write_pages(inode, &mpd);
wbc->nr_to_write -= mpd.pages_written;
ext4_journal_stop(handle); ext4_journal_stop(handle);
/* Submit prepared bio */
ext4_io_submit(&mpd.io_submit);
/* Unlock pages we didn't use */
mpage_release_unused_pages(&mpd, false);
/* Drop our io_end reference we got from init */
ext4_put_io_end(mpd.io_submit.io_end);
if ((mpd.retval == -ENOSPC) && sbi->s_journal) { if (ret == -ENOSPC && sbi->s_journal) {
/* commit the transaction which would /*
* Commit the transaction which would
* free blocks released in the transaction * free blocks released in the transaction
* and try again * and try again
*/ */
jbd2_journal_force_commit_nested(sbi->s_journal); jbd2_journal_force_commit_nested(sbi->s_journal);
ret = 0; ret = 0;
} else if (ret == MPAGE_DA_EXTENT_TAIL) { continue;
/* }
* Got one extent now try with rest of the pages. /* Fatal error - ENOMEM, EIO... */
* If mpd.retval is set -EIO, journal is aborted. if (ret)
* So we don't need to write any more.
*/
pages_written += mpd.pages_written;
ret = mpd.retval;
io_done = 1;
} else if (wbc->nr_to_write)
/*
* There is no more writeout needed
* or we requested for a noblocking writeout
* and we found the device congested
*/
break; break;
} }
blk_finish_plug(&plug); blk_finish_plug(&plug);
if (!io_done && !cycled) { if (!ret && !cycled) {
cycled = 1; cycled = 1;
index = 0; mpd.last_page = writeback_index - 1;
wbc->range_start = index << PAGE_CACHE_SHIFT; mpd.first_page = 0;
wbc->range_end = mapping->writeback_index - 1;
goto retry; goto retry;
} }
/* Update index */ /* Update index */
wbc->range_cyclic = range_cyclic;
if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
/* /*
* set the writeback_index so that range_cyclic * Set the writeback_index so that range_cyclic
* mode will write it back later * mode will write it back later
*/ */
mapping->writeback_index = done_index; mapping->writeback_index = mpd.first_page;
out_writepages: out_writepages:
wbc->range_start = range_start; trace_ext4_da_writepages_result(inode, wbc, ret,
trace_ext4_da_writepages_result(inode, wbc, ret, pages_written); nr_to_write - wbc->nr_to_write);
return ret; return ret;
} }
......
fs/ext4/page-io.c
浏览文件 @ 4e7ea81d
...@@ -360,9 +360,6 @@ static int io_submit_init_bio(struct ext4_io_submit *io, ...@@ -360,9 +360,6 @@ static int io_submit_init_bio(struct ext4_io_submit *io,
bio->bi_bdev = bh->b_bdev; bio->bi_bdev = bh->b_bdev;
bio->bi_end_io = ext4_end_bio; bio->bi_end_io = ext4_end_bio;
bio->bi_private = ext4_get_io_end(io->io_end); bio->bi_private = ext4_get_io_end(io->io_end);
if (!io->io_end->size)
io->io_end->offset = (bh->b_page->index << PAGE_CACHE_SHIFT)
+ bh_offset(bh);
io->io_bio = bio; io->io_bio = bio;
io->io_next_block = bh->b_blocknr; io->io_next_block = bh->b_blocknr;
return 0; return 0;
...@@ -390,7 +387,6 @@ static int io_submit_add_bh(struct ext4_io_submit *io, ...@@ -390,7 +387,6 @@ static int io_submit_add_bh(struct ext4_io_submit *io,
io_end = io->io_end; io_end = io->io_end;
if (test_clear_buffer_uninit(bh)) if (test_clear_buffer_uninit(bh))
ext4_set_io_unwritten_flag(inode, io_end); ext4_set_io_unwritten_flag(inode, io_end);
io_end->size += bh->b_size;
io->io_next_block++; io->io_next_block++;
return 0; return 0;
} }
......
include/trace/events/ext4.h
浏览文件 @ 4e7ea81d
...@@ -324,43 +324,59 @@ TRACE_EVENT(ext4_da_writepages, ...@@ -324,43 +324,59 @@ TRACE_EVENT(ext4_da_writepages,
); );
TRACE_EVENT(ext4_da_write_pages, TRACE_EVENT(ext4_da_write_pages,
TP_PROTO(struct inode *inode, struct mpage_da_data *mpd), TP_PROTO(struct inode *inode, pgoff_t first_page,
struct writeback_control *wbc),
TP_ARGS(inode, mpd), TP_ARGS(inode, first_page, wbc),
TP_STRUCT__entry( TP_STRUCT__entry(
__field( dev_t, dev ) __field( dev_t, dev )
__field( ino_t, ino ) __field( ino_t, ino )
__field( __u64, b_blocknr ) __field( pgoff_t, first_page )
__field( __u32, b_size ) __field( long, nr_to_write )
__field( __u32, b_state )
__field( unsigned long, first_page )
__field( int, io_done )
__field( int, pages_written )
__field( int, sync_mode ) __field( int, sync_mode )
), ),
TP_fast_assign( TP_fast_assign(
__entry->dev = inode->i_sb->s_dev; __entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino; __entry->ino = inode->i_ino;
__entry->b_blocknr = mpd->b_blocknr; __entry->first_page = first_page;
__entry->b_size = mpd->b_size; __entry->nr_to_write = wbc->nr_to_write;
__entry->b_state = mpd->b_state; __entry->sync_mode = wbc->sync_mode;
__entry->first_page = mpd->first_page;
__entry->io_done = mpd->io_done;
__entry->pages_written = mpd->pages_written;
__entry->sync_mode = mpd->wbc->sync_mode;
), ),
TP_printk("dev %d,%d ino %lu b_blocknr %llu b_size %u b_state 0x%04x " TP_printk("dev %d,%d ino %lu first_page %lu nr_to_write %ld "
"first_page %lu io_done %d pages_written %d sync_mode %d", "sync_mode %d",
MAJOR(__entry->dev), MINOR(__entry->dev), MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino, (unsigned long) __entry->ino, __entry->first_page,
__entry->b_blocknr, __entry->b_size, __entry->nr_to_write, __entry->sync_mode)
__entry->b_state, __entry->first_page, );
__entry->io_done, __entry->pages_written,
__entry->sync_mode TRACE_EVENT(ext4_da_write_pages_extent,
) TP_PROTO(struct inode *inode, struct ext4_map_blocks *map),
TP_ARGS(inode, map),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
__field( __u64, lblk )
__field( __u32, len )
__field( __u32, flags )
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->lblk = map->m_lblk;
__entry->len = map->m_len;
__entry->flags = map->m_flags;
),
TP_printk("dev %d,%d ino %lu lblk %llu len %u flags 0x%04x",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino, __entry->lblk, __entry->len,
__entry->flags)
); );
TRACE_EVENT(ext4_da_writepages_result, TRACE_EVENT(ext4_da_writepages_result,
......
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