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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel…
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…/git/tytso/ext4

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: Add new ext4 inode tracepoints
  ext4: Don't call sb_issue_discard() in ext4_free_blocks()
  ext4: do not try to grab the s_umount semaphore in ext4_quota_off
  ext4: fix potential race when freeing ext4_io_page structures
  ext4: handle writeback of inodes which are being freed
  ext4: initialize the percpu counters before replaying the journal
  ext4: "ret" may be used uninitialized in ext4_lazyinit_thread()
  ext4: fix lazyinit hang after removing request
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Linus Torvalds committed Nov 8, 2010
2 parents 5398a64 + 7ff9c07 commit a7bcf21
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Showing 6 changed files with 214 additions and 91 deletions.
4 changes: 3 additions & 1 deletion fs/ext4/ext4.h
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Original file line number Diff line number Diff line change
Expand Up @@ -177,7 +177,7 @@ struct mpage_da_data {

struct ext4_io_page {
struct page *p_page;
int p_count;
atomic_t p_count;
};

#define MAX_IO_PAGES 128
Expand Down Expand Up @@ -858,6 +858,7 @@ struct ext4_inode_info {
spinlock_t i_completed_io_lock;
/* current io_end structure for async DIO write*/
ext4_io_end_t *cur_aio_dio;
atomic_t i_ioend_count; /* Number of outstanding io_end structs */

/*
* Transactions that contain inode's metadata needed to complete
Expand Down Expand Up @@ -2060,6 +2061,7 @@ extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
/* page-io.c */
extern int __init ext4_init_pageio(void);
extern void ext4_exit_pageio(void);
extern void ext4_ioend_wait(struct inode *);
extern void ext4_free_io_end(ext4_io_end_t *io);
extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
extern int ext4_end_io_nolock(ext4_io_end_t *io);
Expand Down
3 changes: 3 additions & 0 deletions fs/ext4/inode.c
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,7 @@
static inline int ext4_begin_ordered_truncate(struct inode *inode,
loff_t new_size)
{
trace_ext4_begin_ordered_truncate(inode, new_size);
return jbd2_journal_begin_ordered_truncate(
EXT4_SB(inode->i_sb)->s_journal,
&EXT4_I(inode)->jinode,
Expand Down Expand Up @@ -178,6 +179,7 @@ void ext4_evict_inode(struct inode *inode)
handle_t *handle;
int err;

trace_ext4_evict_inode(inode);
if (inode->i_nlink) {
truncate_inode_pages(&inode->i_data, 0);
goto no_delete;
Expand Down Expand Up @@ -5647,6 +5649,7 @@ int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode)
int err, ret;

might_sleep();
trace_ext4_mark_inode_dirty(inode, _RET_IP_);
err = ext4_reserve_inode_write(handle, inode, &iloc);
if (ext4_handle_valid(handle) &&
EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize &&
Expand Down
2 changes: 0 additions & 2 deletions fs/ext4/mballoc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4640,8 +4640,6 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
* with group lock held. generate_buddy look at
* them with group lock_held
*/
if (test_opt(sb, DISCARD))
ext4_issue_discard(sb, block_group, bit, count);
ext4_lock_group(sb, block_group);
mb_clear_bits(bitmap_bh->b_data, bit, count);
mb_free_blocks(inode, &e4b, bit, count);
Expand Down
97 changes: 49 additions & 48 deletions fs/ext4/page-io.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -32,8 +32,14 @@

static struct kmem_cache *io_page_cachep, *io_end_cachep;

#define WQ_HASH_SZ 37
#define to_ioend_wq(v) (&ioend_wq[((unsigned long)v) % WQ_HASH_SZ])
static wait_queue_head_t ioend_wq[WQ_HASH_SZ];

int __init ext4_init_pageio(void)
{
int i;

io_page_cachep = KMEM_CACHE(ext4_io_page, SLAB_RECLAIM_ACCOUNT);
if (io_page_cachep == NULL)
return -ENOMEM;
Expand All @@ -42,6 +48,8 @@ int __init ext4_init_pageio(void)
kmem_cache_destroy(io_page_cachep);
return -ENOMEM;
}
for (i = 0; i < WQ_HASH_SZ; i++)
init_waitqueue_head(&ioend_wq[i]);

return 0;
}
Expand All @@ -52,24 +60,37 @@ void ext4_exit_pageio(void)
kmem_cache_destroy(io_page_cachep);
}

void ext4_ioend_wait(struct inode *inode)
{
wait_queue_head_t *wq = to_ioend_wq(inode);

wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_ioend_count) == 0));
}

static void put_io_page(struct ext4_io_page *io_page)
{
if (atomic_dec_and_test(&io_page->p_count)) {
end_page_writeback(io_page->p_page);
put_page(io_page->p_page);
kmem_cache_free(io_page_cachep, io_page);
}
}

void ext4_free_io_end(ext4_io_end_t *io)
{
int i;
wait_queue_head_t *wq;

BUG_ON(!io);
if (io->page)
put_page(io->page);
for (i = 0; i < io->num_io_pages; i++) {
if (--io->pages[i]->p_count == 0) {
struct page *page = io->pages[i]->p_page;

end_page_writeback(page);
put_page(page);
kmem_cache_free(io_page_cachep, io->pages[i]);
}
}
for (i = 0; i < io->num_io_pages; i++)
put_io_page(io->pages[i]);
io->num_io_pages = 0;
iput(io->inode);
wq = to_ioend_wq(io->inode);
if (atomic_dec_and_test(&EXT4_I(io->inode)->i_ioend_count) &&
waitqueue_active(wq))
wake_up_all(wq);
kmem_cache_free(io_end_cachep, io);
}

Expand Down Expand Up @@ -142,8 +163,8 @@ ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags)
io = kmem_cache_alloc(io_end_cachep, flags);
if (io) {
memset(io, 0, sizeof(*io));
io->inode = igrab(inode);
BUG_ON(!io->inode);
atomic_inc(&EXT4_I(inode)->i_ioend_count);
io->inode = inode;
INIT_WORK(&io->work, ext4_end_io_work);
INIT_LIST_HEAD(&io->list);
}
Expand Down Expand Up @@ -171,35 +192,15 @@ static void ext4_end_bio(struct bio *bio, int error)
struct workqueue_struct *wq;
struct inode *inode;
unsigned long flags;
ext4_fsblk_t err_block;
int i;

BUG_ON(!io_end);
inode = io_end->inode;
bio->bi_private = NULL;
bio->bi_end_io = NULL;
if (test_bit(BIO_UPTODATE, &bio->bi_flags))
error = 0;
err_block = bio->bi_sector >> (inode->i_blkbits - 9);
bio_put(bio);

if (!(inode->i_sb->s_flags & MS_ACTIVE)) {
pr_err("sb umounted, discard end_io request for inode %lu\n",
io_end->inode->i_ino);
ext4_free_io_end(io_end);
return;
}

if (error) {
io_end->flag |= EXT4_IO_END_ERROR;
ext4_warning(inode->i_sb, "I/O error writing to inode %lu "
"(offset %llu size %ld starting block %llu)",
inode->i_ino,
(unsigned long long) io_end->offset,
(long) io_end->size,
(unsigned long long) err_block);
}

for (i = 0; i < io_end->num_io_pages; i++) {
struct page *page = io_end->pages[i]->p_page;
struct buffer_head *bh, *head;
Expand Down Expand Up @@ -236,13 +237,7 @@ static void ext4_end_bio(struct bio *bio, int error)
} while (bh != head);
}

if (--io_end->pages[i]->p_count == 0) {
struct page *page = io_end->pages[i]->p_page;

end_page_writeback(page);
put_page(page);
kmem_cache_free(io_page_cachep, io_end->pages[i]);
}
put_io_page(io_end->pages[i]);

/*
* If this is a partial write which happened to make
Expand All @@ -254,8 +249,19 @@ static void ext4_end_bio(struct bio *bio, int error)
if (!partial_write)
SetPageUptodate(page);
}

io_end->num_io_pages = 0;
inode = io_end->inode;

if (error) {
io_end->flag |= EXT4_IO_END_ERROR;
ext4_warning(inode->i_sb, "I/O error writing to inode %lu "
"(offset %llu size %ld starting block %llu)",
inode->i_ino,
(unsigned long long) io_end->offset,
(long) io_end->size,
(unsigned long long)
bio->bi_sector >> (inode->i_blkbits - 9));
}

/* Add the io_end to per-inode completed io list*/
spin_lock_irqsave(&EXT4_I(inode)->i_completed_io_lock, flags);
Expand Down Expand Up @@ -305,7 +311,6 @@ static int io_submit_init(struct ext4_io_submit *io,
bio->bi_private = io->io_end = io_end;
bio->bi_end_io = ext4_end_bio;

io_end->inode = inode;
io_end->offset = (page->index << PAGE_CACHE_SHIFT) + bh_offset(bh);

io->io_bio = bio;
Expand Down Expand Up @@ -360,7 +365,7 @@ static int io_submit_add_bh(struct ext4_io_submit *io,
if ((io_end->num_io_pages == 0) ||
(io_end->pages[io_end->num_io_pages-1] != io_page)) {
io_end->pages[io_end->num_io_pages++] = io_page;
io_page->p_count++;
atomic_inc(&io_page->p_count);
}
return 0;
}
Expand Down Expand Up @@ -389,7 +394,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
return -ENOMEM;
}
io_page->p_page = page;
io_page->p_count = 0;
atomic_set(&io_page->p_count, 1);
get_page(page);

for (bh = head = page_buffers(page), block_start = 0;
Expand Down Expand Up @@ -421,10 +426,6 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
* PageWriteback bit from the page to prevent the system from
* wedging later on.
*/
if (io_page->p_count == 0) {
put_page(page);
end_page_writeback(page);
kmem_cache_free(io_page_cachep, io_page);
}
put_io_page(io_page);
return ret;
}
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