#include <linux/module.h>
#include <linux/pagemap.h> // XXX kill me soon
#include <linux/version.h>
+#include <linux/buffer_head.h>
#define DEBUG_SUBSYSTEM S_FILTER
#warning "implement writeback mode -bzzz"
-int ext3_map_inode_page(struct inode *inode, struct page *page,
- unsigned long *blocks, int *created, int create);
-
/* 512byte block min */
#define MAX_BLOCKS_PER_PAGE (PAGE_SIZE / 512)
struct dio_request {
atomic_t numreqs; /* number of reqs being processed */
+ struct bio *bio_current;/* bio currently being constructed */
struct bio *bio_list; /* list of completed bios */
- wait_queue_head_t wait;
- int created[MAX_BLOCKS_PER_PAGE];
- unsigned long blocks[MAX_BLOCKS_PER_PAGE];
- spinlock_t lock;
+ wait_queue_head_t dr_wait;
+ int dr_num_pages;
+ int dr_rw;
+ int dr_error;
+ int dr_created[MAX_BLOCKS_PER_PAGE];
+ unsigned long dr_blocks[MAX_BLOCKS_PER_PAGE];
+ spinlock_t dr_lock;
+
};
static int dio_complete_routine(struct bio *bio, unsigned int done, int error)
struct dio_request *dreq = bio->bi_private;
unsigned long flags;
- spin_lock_irqsave(&dreq->lock, flags);
+ spin_lock_irqsave(&dreq->dr_lock, flags);
bio->bi_private = dreq->bio_list;
dreq->bio_list = bio;
- spin_unlock_irqrestore(&dreq->lock, flags);
+ spin_unlock_irqrestore(&dreq->dr_lock, flags);
if (atomic_dec_and_test(&dreq->numreqs))
- wake_up(&dreq->wait);
-
+ wake_up(&dreq->dr_wait);
+ if (dreq->dr_error == 0)
+ dreq->dr_error = error;
return 0;
}
static int can_be_merged(struct bio *bio, sector_t sector)
{
- int size;
-
- if (!bio)
- return 0;
-
- size = bio->bi_size >> 9;
- return bio->bi_sector + size == sector ? 1 : 0;
+ unsigned int size;
+ if (!bio)
+ return 0;
+
+ size = bio->bi_size >> 9;
+ return bio->bi_sector + size == sector ? 1 : 0;
+}
+int filter_alloc_iobuf(int rw, int num_pages, void **ret)
+{
+ struct dio_request *dreq;
+
+ LASSERTF(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ, "%x\n", rw);
+
+ OBD_ALLOC(dreq, sizeof(*dreq));
+ if (dreq == NULL)
+ RETURN(-ENOMEM);
+
+ dreq->bio_list = NULL;
+ init_waitqueue_head(&dreq->dr_wait);
+ atomic_set(&dreq->numreqs, 0);
+ spin_lock_init(&dreq->dr_lock);
+ dreq->dr_num_pages = num_pages;
+ dreq->dr_rw = rw;
+
+ *ret = dreq;
+ RETURN(0);
+}
+
+void filter_free_iobuf(void *iobuf)
+{
+ struct dio_request *dreq = iobuf;
+
+ /* free all bios */
+ while (dreq->bio_list) {
+ struct bio *bio = dreq->bio_list;
+ dreq->bio_list = bio->bi_private;
+ bio_put(bio);
+ }
+
+ OBD_FREE(dreq, sizeof(*dreq));
}
-int filter_commitrw_write(struct obd_export *exp, struct obdo *oa, int objcount,
- struct obd_ioobj *obj, int niocount,
- struct niobuf_local *res, struct obd_trans_info *oti)
+int filter_iobuf_add_page(struct obd_device *obd, void *iobuf,
+ struct inode *inode, struct page *page)
+{
+ struct dio_request *dreq = iobuf;
+ int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
+ unsigned int len = inode->i_sb->s_blocksize, offs;
+ struct bio *bio = dreq->bio_current;
+ sector_t sector;
+ int k, rc;
+ ENTRY;
+
+ /* get block number for next page */
+ rc = fsfilt_map_inode_pages(obd, inode, &page, 1, dreq->dr_blocks,
+ dreq->dr_created,
+ dreq->dr_rw == OBD_BRW_WRITE, NULL);
+ if (rc)
+ RETURN(rc);
+
+ for (k = 0, offs = 0; k < blocks_per_page; k++, offs += len) {
+ if (dreq->dr_created[k] == -1) {
+ memset(kmap(page) + offs, 0, len);
+ kunmap(page);
+ continue;
+ }
+
+ sector = dreq->dr_blocks[k] <<(inode->i_sb->s_blocksize_bits-9);
+
+ if (!bio || !can_be_merged(bio, sector) ||
+ !bio_add_page(bio, page, len, offs)) {
+ if (bio) {
+ atomic_inc(&dreq->numreqs);
+ /* FIXME
+ filter_tally_write(&obd->u.filter,dreq->maplist,
+ dreq->nr_pages,dreq->blocks,
+ blocks_per_page);
+ */
+ fsfilt_send_bio(dreq->dr_rw, obd, inode, bio);
+ dreq->bio_current = bio = NULL;
+ }
+ /* allocate new bio */
+ dreq->bio_current = bio =
+ bio_alloc(GFP_NOIO, dreq->dr_num_pages *
+ blocks_per_page);
+ bio->bi_bdev = inode->i_sb->s_bdev;
+ bio->bi_sector = sector;
+ bio->bi_end_io = dio_complete_routine;
+ bio->bi_private = dreq;
+
+ if (!bio_add_page(bio, page, len, offs))
+ LBUG();
+ }
+ }
+ dreq->dr_num_pages--;
+
+ RETURN(0);
+}
+
+static void filter_clear_page_cache(struct inode *inode, struct kiobuf *iobuf)
+{
+#if 0
+ struct page *page;
+ int i;
+
+ for (i = 0; i < iobuf->nr_pages ; i++) {
+ page = find_lock_page(inode->i_mapping,
+ iobuf->maplist[i]->index);
+ if (page == NULL)
+ continue;
+ if (page->mapping != NULL) {
+ block_invalidatepage(page, 0);
+ truncate_complete_page(page);
+ }
+ unlock_page(page);
+ page_cache_release(page);
+ }
+#endif
+}
+
+/* Must be called with i_sem taken for writes; this will drop it */
+int filter_direct_io(int rw, struct dentry *dchild, void *iobuf,
+ struct obd_export *exp, struct iattr *attr,
+ struct obd_trans_info *oti, void **wait_handle)
+{
+ struct dio_request *dreq = iobuf;
+ struct inode *inode = dchild->d_inode;
+ int rc;
+ ENTRY;
+
+ LASSERTF(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ, "%x\n", rw);
+
+ /* This is nearly osync_inode, without the waiting
+ rc = generic_osync_inode(inode, inode->i_mapping,
+ OSYNC_DATA|OSYNC_METADATA); */
+ rc = filemap_fdatawrite(inode->i_mapping);
+ if (rc == 0)
+ rc = sync_mapping_buffers(inode->i_mapping);
+ if (rc == 0)
+ rc = filemap_fdatawait(inode->i_mapping);
+ if (rc < 0)
+ GOTO(cleanup, rc);
+
+ if (rw == OBD_BRW_WRITE)
+ up(&inode->i_sem);
+
+ /* be careful to call this after fsync_inode_data_buffers has waited
+ * for IO to complete before we evict it from the cache */
+ filter_clear_page_cache(inode, iobuf);
+
+ if (dreq->bio_current != NULL) {
+ atomic_inc(&dreq->numreqs);
+ fsfilt_send_bio(rw, exp->exp_obd, inode, dreq->bio_current);
+ dreq->bio_current = NULL;
+ }
+
+ /* time to wait for I/O completion */
+ wait_event(dreq->dr_wait, atomic_read(&dreq->numreqs) == 0);
+
+ rc = dreq->dr_error;
+ if (rw == OBD_BRW_WRITE && rc == 0) {
+ /* FIXME:
+ filter_tally_write(&obd->u.filter, dreq->maplist,
+ dreq->nr_pages, dreq->blocks,
+ blocks_per_page);
+ */
+
+ if (attr->ia_size > inode->i_size) {
+ CDEBUG(D_INFO, "setting i_size to "LPU64"\n",
+ attr->ia_size);
+
+ attr->ia_valid |= ATTR_SIZE;
+ down(&inode->i_sem);
+ fsfilt_setattr(exp->exp_obd, dchild, oti->oti_handle,
+ attr, 0);
+ up(&inode->i_sem);
+ }
+ }
+
+cleanup:
+ RETURN(rc);
+}
+
+
+
+/* See if there are unallocated parts in given file region */
+static int filter_range_is_mapped(struct inode *inode, obd_size offset, int len)
+{
+ sector_t (*fs_bmap)(struct address_space *, sector_t) =
+ inode->i_mapping->a_ops->bmap;
+ int j;
+
+ /* We can't know if we are overwriting or not */
+ if (fs_bmap == NULL)
+ return 0;
+
+ offset >>= inode->i_blkbits;
+ len >>= inode->i_blkbits;
+
+ for (j = 0; j <= len; j++)
+ if (fs_bmap(inode->i_mapping, offset + j) == 0)
+ return 0;
+
+ return 1;
+}
+
+int filter_commitrw_write(struct obd_export *exp, struct obdo *oa,
+ int objcount, struct obd_ioobj *obj, int niocount,
+ struct niobuf_local *res, struct obd_trans_info *oti,
+ int rc)
{
- struct obd_device *obd = exp->exp_obd;
- struct obd_run_ctxt saved;
struct niobuf_local *lnb;
+ struct dio_request *dreq = NULL;
+ struct lvfs_run_ctxt saved;
struct fsfilt_objinfo fso;
- struct iattr iattr = { .ia_valid = ATTR_SIZE, .ia_size = 0, };
+ struct iattr iattr = { 0 };
struct inode *inode = NULL;
- int rc = 0, i, k, cleanup_phase = 0, err;
- unsigned long now = jiffies; /* DEBUGGING OST TIMEOUTS */
- int blocks_per_page;
- struct dio_request *dreq;
- struct bio *bio = NULL;
+ unsigned long now = jiffies;
+ int i, err, cleanup_phase = 0;
+ struct obd_device *obd = exp->exp_obd;
+
ENTRY;
+
LASSERT(oti != NULL);
LASSERT(objcount == 1);
LASSERT(current->journal_info == NULL);
+ if (rc != 0)
+ GOTO(cleanup, rc);
+
inode = res->dentry->d_inode;
- blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
- LASSERT(blocks_per_page <= MAX_BLOCKS_PER_PAGE);
- OBD_ALLOC(dreq, sizeof(*dreq));
- if (dreq == NULL)
- RETURN(-ENOMEM);
- dreq->bio_list = NULL;
- init_waitqueue_head(&dreq->wait);
- atomic_set(&dreq->numreqs, 0);
- spin_lock_init(&dreq->lock);
+ rc = filter_alloc_iobuf(OBD_BRW_WRITE, obj->ioo_bufcnt, (void **)&dreq);
+ if (rc)
+ GOTO(cleanup, rc);
cleanup_phase = 1;
fso.fso_dentry = res->dentry;
fso.fso_bufcnt = obj->ioo_bufcnt;
- push_ctxt(&saved, &obd->obd_ctxt, NULL);
- cleanup_phase = 2;
+ push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
+ cleanup_phase = 2;
- oti->oti_handle = fsfilt_brw_start(obd, objcount, &fso, niocount, oti);
+ generic_osync_inode(inode, inode->i_mapping, OSYNC_DATA|OSYNC_METADATA);
+
+ oti->oti_handle = fsfilt_brw_start(obd, objcount, &fso, niocount, res,
+ oti);
if (IS_ERR(oti->oti_handle)) {
rc = PTR_ERR(oti->oti_handle);
CDEBUG(rc == -ENOSPC ? D_INODE : D_ERROR,
GOTO(cleanup, rc);
}
+ /* have to call fsfilt_commit() from this point on */
+
if (time_after(jiffies, now + 15 * HZ))
CERROR("slow brw_start %lus\n", (jiffies - now) / HZ);
+ down(&inode->i_sem);
for (i = 0, lnb = res; i < obj->ioo_bufcnt; i++, lnb++) {
loff_t this_size;
- sector_t sector;
- int offs;
-
- /* get block number for next page */
- rc = ext3_map_inode_page(inode, lnb->page, dreq->blocks,
- dreq->created, 1);
- if (rc)
- GOTO(cleanup, rc);
-
- for (k = 0; k < blocks_per_page; k++) {
- sector = dreq->blocks[k] * (inode->i_sb->s_blocksize >> 9);
- offs = k * inode->i_sb->s_blocksize;
-
- if (!bio || !can_be_merged(bio, sector) ||
- !bio_add_page(bio, lnb->page, lnb->len, offs)) {
- if (bio) {
- atomic_inc(&dreq->numreqs);
- submit_bio(WRITE, bio);
- bio = NULL;
- }
- /* allocate new bio */
- bio = bio_alloc(GFP_NOIO, obj->ioo_bufcnt);
- bio->bi_bdev = inode->i_sb->s_bdev;
- bio->bi_sector = sector;
- bio->bi_end_io = dio_complete_routine;
- bio->bi_private = dreq;
-
- if (!bio_add_page(bio, lnb->page, lnb->len, 0))
- LBUG();
- }
- }
-
- /* We expect these pages to be in offset order, but we'll
+
+ /* If overwriting an existing block, we don't need a grant */
+ if (!(lnb->flags & OBD_BRW_GRANTED) && lnb->rc == -ENOSPC &&
+ filter_range_is_mapped(inode, lnb->offset, lnb->len))
+ lnb->rc = 0;
+
+ if (lnb->rc) /* ENOSPC, network RPC error, etc. */
+ continue;
+
+ err = filter_iobuf_add_page(obd, dreq, inode, lnb->page);
+ if (err != 0) {
+ lnb->rc = err;
+ continue;
+ }
+
+ /* we expect these pages to be in offset order, but we'll
* be forgiving */
this_size = lnb->offset + lnb->len;
if (this_size > iattr.ia_size)
iattr.ia_size = this_size;
}
- if (bio) {
- atomic_inc(&dreq->numreqs);
- submit_bio(WRITE, bio);
- }
-
- /* time to wait for I/O completion */
- wait_event(dreq->wait, atomic_read(&dreq->numreqs) == 0);
- /* free all bios */
- while (dreq->bio_list) {
- bio = dreq->bio_list;
- dreq->bio_list = bio->bi_private;
- bio_put(bio);
- }
-
- if (rc == 0) {
- down(&inode->i_sem);
- inode_update_time(inode, 1);
- if (iattr.ia_size > inode->i_size) {
- CDEBUG(D_INFO, "setting i_size to "LPU64"\n",
- iattr.ia_size);
- fsfilt_setattr(obd, res->dentry, oti->oti_handle,
- &iattr, 0);
- }
- up(&inode->i_sem);
- }
+ iattr_from_obdo(&iattr,oa,OBD_MD_FLATIME|OBD_MD_FLMTIME|OBD_MD_FLCTIME);
+ rc = filter_direct_io(OBD_BRW_WRITE, res->dentry, dreq, exp, &iattr,
+ oti, NULL);
+ rc = filter_finish_transno(exp, oti, rc);
if (time_after(jiffies, now + 15 * HZ))
CERROR("slow direct_io %lus\n", (jiffies - now) / HZ);
- rc = filter_finish_transno(exp, oti, rc);
- err = fsfilt_commit(obd, inode, oti->oti_handle, obd_sync_filter);
+
+ err = fsfilt_commit(obd, obd->u.filter.fo_sb, inode, oti->oti_handle,
+ obd_sync_filter);
if (err)
rc = err;
+
if (obd_sync_filter)
LASSERT(oti->oti_transno <= obd->obd_last_committed);
+
if (time_after(jiffies, now + 15 * HZ))
CERROR("slow commitrw commit %lus\n", (jiffies - now) / HZ);
cleanup:
+ filter_grant_commit(exp, niocount, res);
+
switch (cleanup_phase) {
case 2:
- pop_ctxt(&saved, &obd->obd_ctxt, NULL);
+ pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
LASSERT(current->journal_info == NULL);
case 1:
- OBD_FREE(dreq, sizeof(*dreq));
+ filter_free_iobuf(dreq);
case 0:
- for (i = 0, lnb = res; i < obj->ioo_bufcnt; i++, lnb++) {
- /* flip_.. gets a ref, while free_page only frees
- * when it decrefs to 0 */
- if (rc == 0)
- flip_into_page_cache(inode, lnb->page);
- __free_page(lnb->page);
- }
+ filter_free_dio_pages(objcount, obj, niocount, res);
f_dput(res->dentry);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff