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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: Boaz Harrosh <bharrosh@panasas.com>
This commit is contained in:
Boaz Harrosh 2010-11-16 20:09:58 +02:00
parent 16f75bb35d
commit e1042ba099
3 changed files with 38 additions and 16 deletions
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6
fs/exofs/exofs.h
View File

@ -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);

34
fs/exofs/inode.c
View File

@ -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;

14
fs/exofs/ios.c
View File

@ -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) {