Commit e1042ba0 authored by Boaz Harrosh's avatar Boaz Harrosh
Browse files

exofs: Add offset/length to exofs_get_io_state 



In future raid code we will need to know the IO offset/length
and if it's a read or write to determine some of the array
sizes we'll need.

So add a new exofs_get_rw_state() API for use when
writeing/reading. All other simple cases are left using the
old way.

The major change to this is that now we need to call
exofs_get_io_state later at inode.c::read_exec and
inode.c::write_exec when we actually know these things. So this
patch is kept separate so I can test things apart from other
changes.

Signed-off-by: default avatarBoaz Harrosh <bharrosh@panasas.com>
parent 16f75bb3

fs/exofs/exofs.h

+5 −1
Original line number Diff line number Diff line
@@ -109,7 +109,7 @@ static inline osd_id exofs_oi_objno(struct exofs_i_info *oi) 
}



struct exofs_io_state;

typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private);

typedef void (*exofs_io_done_fn)(struct exofs_io_state *ios, void *private);



struct exofs_io_state {

	struct kref		kref;
@@ -137,6 +137,8 @@ struct exofs_io_state { 
	unsigned		out_attr_len;

	struct osd_attr 	*out_attr;



	bool			reading;



	/* Variable array of size numdevs */

	unsigned numdevs;

	struct exofs_per_dev_state {
@@ -218,6 +220,8 @@ void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], 
int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,

		    u64 offset, void *p, unsigned length);



int  exofs_get_rw_state(struct exofs_layout *layout, bool is_reading,

			u64 offset, u64 length, struct exofs_io_state **ios);

int  exofs_get_io_state(struct exofs_layout *layout,

			struct exofs_io_state **ios);

void exofs_put_io_state(struct exofs_io_state *ios);

fs/exofs/inode.c

+21 −13
Original line number Diff line number Diff line
@@ -110,13 +110,6 @@ static int pcol_try_alloc(struct page_collect *pcol) 
{

	unsigned pages;



	if (!pcol->ios) { /* First time allocate io_state */

		int ret = exofs_get_io_state(&pcol->sbi->layout, &pcol->ios);



		if (ret)

			return ret;

	}



	/* TODO: easily support bio chaining */

	pages =  exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages);
@@ -269,17 +262,25 @@ static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw) 
static int read_exec(struct page_collect *pcol)

{

	struct exofs_i_info *oi = exofs_i(pcol->inode);

	struct exofs_io_state *ios = pcol->ios;

	struct exofs_io_state *ios;

	struct page_collect *pcol_copy = NULL;

	int ret;



	if (!pcol->pages)

		return 0;



	if (!pcol->ios) {

		int ret = exofs_get_rw_state(&pcol->sbi->layout, true,

					     pcol->pg_first << PAGE_CACHE_SHIFT,

					     pcol->length, &pcol->ios);



		if (ret)

			return ret;

	}



	ios = pcol->ios;

	ios->pages = pcol->pages;

	ios->nr_pages = pcol->nr_pages;

	ios->length = pcol->length;

	ios->offset = pcol->pg_first << PAGE_CACHE_SHIFT;



	if (pcol->read_4_write) {

		exofs_oi_read(oi, pcol->ios);
@@ -507,13 +508,21 @@ static void writepages_done(struct exofs_io_state *ios, void *p) 
static int write_exec(struct page_collect *pcol)

{

	struct exofs_i_info *oi = exofs_i(pcol->inode);

	struct exofs_io_state *ios = pcol->ios;

	struct exofs_io_state *ios;

	struct page_collect *pcol_copy = NULL;

	int ret;



	if (!pcol->pages)

		return 0;



	BUG_ON(pcol->ios);

	ret = exofs_get_rw_state(&pcol->sbi->layout, false,

				 pcol->pg_first << PAGE_CACHE_SHIFT,

				 pcol->length, &pcol->ios);



	if (unlikely(ret))

		goto err;



	pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);

	if (!pcol_copy) {

		EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n");
@@ -523,10 +532,9 @@ static int write_exec(struct page_collect *pcol) 


	*pcol_copy = *pcol;



	ios = pcol->ios;

	ios->pages = pcol_copy->pages;

	ios->nr_pages = pcol_copy->nr_pages;

	ios->offset = pcol_copy->pg_first << PAGE_CACHE_SHIFT;

	ios->length = pcol_copy->length;

	ios->done = writepages_done;

	ios->private = pcol_copy;

fs/exofs/ios.c

+12 −2
Original line number Diff line number Diff line
@@ -69,8 +69,8 @@ out: 
	return ret;

}



int exofs_get_io_state(struct exofs_layout *layout,

		       struct exofs_io_state **pios)

int  exofs_get_rw_state(struct exofs_layout *layout, bool is_reading,

			u64 offset, u64 length, struct exofs_io_state **pios)

{

	struct exofs_io_state *ios;
@@ -87,10 +87,20 @@ int exofs_get_io_state(struct exofs_layout *layout, 


	ios->layout = layout;

	ios->obj.partition = layout->s_pid;

	ios->offset = offset;

	ios->length = length;

	ios->reading = is_reading;



	*pios = ios;

	return 0;

}



int  exofs_get_io_state(struct exofs_layout *layout,

			struct exofs_io_state **ios)

{

	return exofs_get_rw_state(layout, true, 0, 0, ios);

}



void exofs_put_io_state(struct exofs_io_state *ios)

{

	if (ios) {

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