int rc;
page = grab_cache_page(mapping, index); /* locked page */
- if (IS_ERR(page))
- return lnb->rc = PTR_ERR(page);
+ if (page == NULL)
+ return lnb->rc = -ENOMEM;
+
+ LASSERT(page->mapping == mapping);
lnb->page = page;
return lnb->rc;
}
-static struct page *lustre_get_page_write(struct inode *inode,
- unsigned long index)
+/* Grab the dirty and seen grant announcements from the incoming obdo.
+ * We will later calculate the clients new grant and return it.
+ * Caller must hold osfs lock */
+static void filter_grant_incoming(struct obd_export *exp, struct obdo *oa)
{
- struct address_space *mapping = inode->i_mapping;
- struct page *page;
- int rc;
+ struct filter_export_data *fed;
+ struct obd_device *obd = exp->exp_obd;
+ ENTRY;
- page = grab_cache_page(mapping, index); /* locked page */
+ LASSERT_SPIN_LOCKED(&obd->obd_osfs_lock);
- if (!IS_ERR(page)) {
- /* Note: Called with "O" and "PAGE_SIZE" this is essentially
- * a no-op for most filesystems, because we write the whole
- * page. For partial-page I/O this will read in the page.
- */
- rc = mapping->a_ops->prepare_write(NULL, page, 0, PAGE_SIZE);
- if (rc) {
- CERROR("page index %lu, rc = %d\n", index, rc);
- if (rc != -ENOSPC)
- LBUG();
- GOTO(err_unlock, rc);
- }
- /* XXX not sure if we need this if we are overwriting page */
- if (PageError(page)) {
- CERROR("error on page index %lu, rc = %d\n", index, rc);
- LBUG();
- GOTO(err_unlock, rc = -EIO);
- }
+ if ((oa->o_valid & (OBD_MD_FLBLOCKS|OBD_MD_FLGRANT)) !=
+ (OBD_MD_FLBLOCKS|OBD_MD_FLGRANT)) {
+ oa->o_valid &= ~OBD_MD_FLGRANT;
+ EXIT;
+ return;
}
- return page;
-err_unlock:
- unlock_page(page);
- page_cache_release(page);
- return ERR_PTR(rc);
+ fed = &exp->exp_filter_data;
+
+ /* Add some margin, since there is a small race if other RPCs arrive
+ * out-or-order and have already consumed some grant. We want to
+ * leave this here in case there is a large error in accounting. */
+ CDEBUG(oa->o_grant > fed->fed_grant + FILTER_GRANT_CHUNK ?
+ D_ERROR : D_CACHE,
+ "%s: cli %s/%p reports grant: "LPU64" dropped: %u, local: %lu\n",
+ obd->obd_name, exp->exp_client_uuid.uuid, exp, oa->o_grant,
+ oa->o_dropped, fed->fed_grant);
+
+ /* Update our accounting now so that statfs takes it into account.
+ * Note that fed_dirty is only approximate and can become incorrect
+ * if RPCs arrive out-of-order. No important calculations depend
+ * on fed_dirty however. */
+ obd->u.filter.fo_tot_dirty += oa->o_dirty - fed->fed_dirty;
+ if (fed->fed_grant < oa->o_dropped) {
+ CERROR("%s: cli %s/%p reports %u dropped > fed_grant %lu\n",
+ obd->obd_name, exp->exp_client_uuid.uuid, exp,
+ oa->o_dropped, fed->fed_grant);
+ oa->o_dropped = 0;
+ }
+ if (obd->u.filter.fo_tot_granted < oa->o_dropped) {
+ CERROR("%s: cli %s/%p reports %u dropped > tot_grant "LPU64"\n",
+ obd->obd_name, exp->exp_client_uuid.uuid, exp,
+ oa->o_dropped, obd->u.filter.fo_tot_granted);
+ oa->o_dropped = 0;
+ }
+ obd->u.filter.fo_tot_granted -= oa->o_dropped;
+ fed->fed_grant -= oa->o_dropped;
+ fed->fed_dirty = oa->o_dirty;
+ EXIT;
}
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
-int wait_on_page_locked(struct page *page)
-{
- waitfor_one_page(page);
- return 0;
-}
+#define GRANT_FOR_LLOG(obd) 16
-/* We should only change the file mtime (and not the ctime, like
- * update_inode_times() in generic_file_write()) when we only change data. */
-static inline void inode_update_time(struct inode *inode, int ctime_too)
+/* Figure out how much space is available between what we've granted
+ * and what remains in the filesystem. Compensate for ext3 indirect
+ * block overhead when computing how much free space is left ungranted.
+ *
+ * Caller must hold obd_osfs_lock. */
+obd_size filter_grant_space_left(struct obd_export *exp)
{
- time_t now = CURRENT_TIME;
- if (inode->i_mtime == now && (!ctime_too || inode->i_ctime == now))
- return;
- inode->i_mtime = now;
- if (ctime_too)
- inode->i_ctime = now;
- mark_inode_dirty_sync(inode);
-}
-#endif
+ struct obd_device *obd = exp->exp_obd;
+ int blockbits = obd->u.filter.fo_sb->s_blocksize_bits;
+ obd_size tot_granted = obd->u.filter.fo_tot_granted, avail, left = 0;
+ int rc, statfs_done = 0;
+
+ LASSERT_SPIN_LOCKED(&obd->obd_osfs_lock);
+
+ if (time_before(obd->obd_osfs_age, jiffies - HZ)) {
+restat:
+ rc = fsfilt_statfs(obd, obd->u.filter.fo_sb, jiffies + 1);
+ if (rc) /* N.B. statfs can't really fail */
+ RETURN(0);
+ statfs_done = 1;
+ }
-static int lustre_commit_write(struct niobuf_local *lnb)
-{
- struct page *page = lnb->page;
- unsigned from = lnb->offset & ~PAGE_MASK;
- unsigned to = from + lnb->len;
- struct inode *inode = page->mapping->host;
- int err;
-
- LASSERT(to <= PAGE_SIZE);
- err = page->mapping->a_ops->commit_write(NULL, page, from, to);
-#warning 2.4 folks: wait_on_page_locked does NOT return its error here.
- if (!err && IS_SYNC(inode))
- wait_on_page_locked(page);
- //SetPageUptodate(page); // the client commit_write will do this
-
- SetPageReferenced(page);
- unlock_page(page);
- page_cache_release(page);
- return err;
-}
+ avail = obd->obd_osfs.os_bavail;
+ left = avail - (avail >> (blockbits - 3)); /* (d)indirect */
+ if (left > GRANT_FOR_LLOG(obd)) {
+ left = (left - GRANT_FOR_LLOG(obd)) << blockbits;
+ } else {
+ left = 0 /* << blockbits */;
+ }
-int filter_get_page_write(struct inode *inode, struct niobuf_local *lnb,
- int *pglocked)
-{
- unsigned long index = lnb->offset >> PAGE_SHIFT;
- struct address_space *mapping = inode->i_mapping;
- struct page *page;
- int rc;
+ if (!statfs_done && left < 32 * FILTER_GRANT_CHUNK + tot_granted) {
+ CDEBUG(D_CACHE, "fs has no space left and statfs too old\n");
+ goto restat;
+ }
- //ASSERT_PAGE_INDEX(index, GOTO(err, rc = -EINVAL));
- if (*pglocked)
- page = grab_cache_page_nowait(mapping, index); /* locked page */
- else
- page = grab_cache_page(mapping, index); /* locked page */
+ if (left >= tot_granted) {
+ left -= tot_granted;
+ } else {
+ static unsigned long next;
+ if (left < tot_granted - obd->u.filter.fo_tot_pending &&
+ time_after(jiffies, next)) {
+ spin_unlock(&obd->obd_osfs_lock);
+ CERROR("%s: cli %s/%p grant "LPU64" > available "
+ LPU64" and pending "LPU64"\n", obd->obd_name,
+ exp->exp_client_uuid.uuid, exp, tot_granted,
+ left, obd->u.filter.fo_tot_pending);
+ if (next == 0)
+ portals_debug_dumplog();
+ next = jiffies + 20 * HZ;
+ spin_lock(&obd->obd_osfs_lock);
+ }
+ left = 0;
+ }
+ CDEBUG(D_CACHE, "%s: cli %s/%p free: "LPU64" avail: "LPU64" grant "LPU64
+ " left: "LPU64" pending: "LPU64"\n", obd->obd_name,
+ exp->exp_client_uuid.uuid, exp,
+ obd->obd_osfs.os_bfree << blockbits, avail << blockbits,
+ tot_granted, left, obd->u.filter.fo_tot_pending);
- /* This page is currently locked, so get a temporary page instead. */
- if (page == NULL) {
- CDEBUG(D_INFO, "ino %lu page %ld locked\n", inode->i_ino,index);
- page = alloc_pages(GFP_KERNEL, 0); /* locked page */
- if (page == NULL) {
- CERROR("no memory for a temp page\n");
- GOTO(err, rc = -ENOMEM);
- }
- page->index = index;
- lnb->page = page;
- lnb->flags |= N_LOCAL_TEMP_PAGE;
- } else if (!IS_ERR(page)) {
- unsigned from = lnb->offset & ~PAGE_MASK, to = from + lnb->len;
- (*pglocked)++;
-
- rc = mapping->a_ops->prepare_write(NULL, page, from, to);
- if (rc) {
- if (rc != -ENOSPC)
- CERROR("page index %lu, rc = %d\n", index, rc);
- GOTO(err_unlock, rc);
- }
- /* XXX not sure if we need this if we are overwriting page */
- if (PageError(page)) {
- CERROR("error on page index %lu, rc = %d\n", index, rc);
- LBUG();
- GOTO(err_unlock, rc = -EIO);
+ return left;
+}
+
+/* Calculate how much grant space to allocate to this client, based on how
+ * much space is currently free and how much of that is already granted.
+ *
+ * Caller must hold obd_osfs_lock. */
+long filter_grant(struct obd_export *exp, obd_size current_grant,
+ obd_size want, obd_size fs_space_left)
+{
+ struct obd_device *obd = exp->exp_obd;
+ struct filter_export_data *fed = &exp->exp_filter_data;
+ int blockbits = obd->u.filter.fo_sb->s_blocksize_bits;
+ __u64 grant = 0;
+
+ LASSERT_SPIN_LOCKED(&obd->obd_osfs_lock);
+
+ /* Grant some fraction of the client's requested grant space so that
+ * they are not always waiting for write credits (not all of it to
+ * avoid overgranting in face of multiple RPCs in flight). This
+ * essentially will be able to control the OSC_MAX_RIF for a client.
+ *
+ * If we do have a large disparity between what the client thinks it
+ * has and what we think it has, don't grant very much and let the
+ * client consume its grant first. Either it just has lots of RPCs
+ * in flight, or it was evicted and its grants will soon be used up. */
+ if (current_grant < want) {
+ if (current_grant > fed->fed_grant + FILTER_GRANT_CHUNK)
+ want = 65536;
+ grant = min((want >> blockbits) / 2,
+ (fs_space_left >> blockbits) / 8);
+ grant <<= blockbits;
+
+ if (grant) {
+ if (grant > FILTER_GRANT_CHUNK)
+ grant = FILTER_GRANT_CHUNK;
+
+ obd->u.filter.fo_tot_granted += grant;
+ fed->fed_grant += grant;
}
- lnb->page = page;
}
- return 0;
+ CDEBUG(D_CACHE,"%s: cli %s/%p wants: "LPU64" granting: "LPU64"\n",
+ obd->obd_name, exp->exp_client_uuid.uuid, exp, want, grant);
+ CDEBUG(D_CACHE,
+ "%s: cli %s/%p tot cached:"LPU64" granted:"LPU64
+ " num_exports: %d\n", obd->obd_name, exp->exp_client_uuid.uuid,
+ exp, obd->u.filter.fo_tot_dirty,
+ obd->u.filter.fo_tot_granted, obd->obd_num_exports);
-err_unlock:
- unlock_page(page);
- page_cache_release(page);
-err:
- return lnb->rc = rc;
+ return grant;
}
static int filter_preprw_read(int cmd, struct obd_export *exp, struct obdo *oa,
struct niobuf_local *res,
struct obd_trans_info *oti)
{
+ struct obd_device *obd = exp->exp_obd;
struct obd_run_ctxt saved;
struct obd_ioobj *o;
struct niobuf_remote *rnb;
- struct niobuf_local *lnb;
+ struct niobuf_local *lnb = NULL;
struct fsfilt_objinfo *fso;
struct dentry *dentry;
struct inode *inode;
- int rc = 0, i, j, tot_bytes = 0;
+ int rc = 0, i, j, tot_bytes = 0, cleanup_phase = 0;
unsigned long now = jiffies;
ENTRY;
- /* We are currently not supporting multi-obj BRW_READ RPCS at all */
+ /* We are currently not supporting multi-obj BRW_READ RPCS at all.
+ * When we do this function's dentry cleanup will need to be fixed */
LASSERT(objcount == 1);
+ LASSERT(obj->ioo_bufcnt > 0);
+
+ if (oa && oa->o_valid & OBD_MD_FLGRANT) {
+ spin_lock(&obd->obd_osfs_lock);
+ filter_grant_incoming(exp, oa);
+
+#if 0
+ /* Reads do not increase grants */
+ oa->o_grant = filter_grant(exp, oa->o_grant, oa->o_undirty,
+ filter_grant_space_left(exp));
+#else
+ oa->o_grant = 0;
+#endif
+ spin_unlock(&obd->obd_osfs_lock);
+ }
OBD_ALLOC(fso, objcount * sizeof(*fso));
if (fso == NULL)
memset(res, 0, niocount * sizeof(*res));
- push_ctxt(&saved, &exp->exp_obd->u.filter.fo_ctxt, NULL);
+ push_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
for (i = 0, o = obj; i < objcount; i++, o++) {
- struct filter_dentry_data *fdd;
LASSERT(o->ioo_bufcnt);
- dentry = filter_oa2dentry(exp->exp_obd, oa);
+ dentry = filter_oa2dentry(obd, oa);
if (IS_ERR(dentry))
- GOTO(out_objinfo, rc = PTR_ERR(dentry));
+ GOTO(cleanup, rc = PTR_ERR(dentry));
if (dentry->d_inode == NULL) {
CERROR("trying to BRW to non-existent file "LPU64"\n",
o->ioo_id);
f_dput(dentry);
- GOTO(out_objinfo, rc = -ENOENT);
+ GOTO(cleanup, rc = -ENOENT);
}
fso[i].fso_dentry = dentry;
fso[i].fso_bufcnt = o->ioo_bufcnt;
-
- fdd = dentry->d_fsdata;
- if (fdd == NULL || !atomic_read(&fdd->fdd_open_count))
- CDEBUG(D_PAGE, "I/O to unopened object "LPU64"\n",
- o->ioo_id);
}
if (time_after(jiffies, now + 15 * HZ))
- CERROR("slow prep setup %lus\n", (jiffies - now) / HZ);
+ CERROR("slow preprw_read setup %lus\n", (jiffies - now) / HZ);
+ else
+ CDEBUG(D_INFO, "preprw_read setup: %lu jiffies\n",
+ (jiffies - now));
for (i = 0, o = obj, rnb = nb, lnb = res; i < objcount; i++, o++) {
dentry = fso[i].fso_dentry;
inode = dentry->d_inode;
for (j = 0; j < o->ioo_bufcnt; j++, rnb++, lnb++) {
- if (j == 0)
- lnb->dentry = dentry;
- else
- lnb->dentry = dget(dentry);
-
+ lnb->dentry = dentry;
lnb->offset = rnb->offset;
lnb->len = rnb->len;
lnb->flags = rnb->flags;
- lnb->start = jiffies;
if (inode->i_size <= rnb->offset) {
/* If there's no more data, abort early.
* lnb->page == NULL and lnb->rc == 0, so it's
* easy to detect later. */
- f_dput(dentry);
- lnb->dentry = NULL;
break;
} else {
rc = filter_start_page_read(inode, lnb);
"page err %u@"LPU64" %u/%u %p: rc %d\n",
lnb->len, lnb->offset, j, o->ioo_bufcnt,
dentry, rc);
- f_dput(dentry);
- GOTO(out_pages, rc);
+ cleanup_phase = 1;
+ GOTO(cleanup, rc);
}
tot_bytes += lnb->rc;
- if (lnb->rc < lnb->len)
- break; /* short read */
+ if (lnb->rc < lnb->len) {
+ /* short read, be sure to wait on it */
+ lnb++;
+ break;
+ }
}
}
if (time_after(jiffies, now + 15 * HZ))
- CERROR("slow prep get page %lus\n", (jiffies - now) / HZ);
+ CERROR("slow start_page_read %lus\n", (jiffies - now) / HZ);
+ else
+ CDEBUG(D_INFO, "start_page_read: %lu jiffies\n",
+ (jiffies - now));
- lprocfs_counter_add(exp->exp_obd->obd_stats, LPROC_FILTER_READ_BYTES,
- tot_bytes);
+ lprocfs_counter_add(obd->obd_stats, LPROC_FILTER_READ_BYTES, tot_bytes);
while (lnb-- > res) {
rc = filter_finish_page_read(lnb);
if (rc) {
CERROR("error page %u@"LPU64" %u %p: rc %d\n", lnb->len,
lnb->offset, (int)(lnb - res), lnb->dentry, rc);
- f_dput(lnb->dentry);
- GOTO(out_pages, rc);
+ cleanup_phase = 1;
+ GOTO(cleanup, rc);
}
}
if (time_after(jiffies, now + 15 * HZ))
- CERROR("slow prep finish page %lus\n", (jiffies - now) / HZ);
+ CERROR("slow finish_page_read %lus\n", (jiffies - now) / HZ);
+ else
+ CDEBUG(D_INFO, "finish_page_read: %lu jiffies\n",
+ (jiffies - now));
+
+ filter_tally_read(&exp->exp_obd->u.filter, res, niocount);
EXIT;
-out:
- OBD_FREE(fso, objcount * sizeof(*fso));
- /* we saved the journal handle into oti->oti_handle instead */
- current->journal_info = NULL;
- pop_ctxt(&saved, &exp->exp_obd->u.filter.fo_ctxt, NULL);
- return rc;
-out_pages:
- while (lnb-- > res) {
- page_cache_release(lnb->page);
- f_dput(lnb->dentry);
+ cleanup:
+ switch (cleanup_phase) {
+ case 1:
+ for (lnb = res; lnb < (res + niocount); lnb++) {
+ if (lnb->page)
+ page_cache_release(lnb->page);
+ }
+ if (res->dentry != NULL)
+ f_dput(res->dentry);
+ else
+ CERROR("NULL dentry in cleanup -- tell CFS\n");
+ case 0:
+ OBD_FREE(fso, objcount * sizeof(*fso));
+ pop_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
}
- goto out; /* dropped the dentry refs already (one per page) */
-
-out_objinfo:
- for (i = 0; i < objcount && fso[i].fso_dentry; i++)
- f_dput(fso[i].fso_dentry);
- goto out;
+ return rc;
}
-/* We need to balance prepare_write() calls with commit_write() calls.
- * If the page has been prepared, but we have no data for it, we don't
- * want to overwrite valid data on disk, but we still need to zero out
- * data for space which was newly allocated. Like part of what happens
- * in __block_prepare_write() for newly allocated blocks.
+/* When clients have dirtied as much space as they've been granted they
+ * fall through to sync writes. These sync writes haven't been expressed
+ * in grants and need to error with ENOSPC when there isn't room in the
+ * filesystem for them after grants are taken into account. However,
+ * writeback of the dirty data that was already granted space can write
+ * right on through.
*
- * XXX currently __block_prepare_write() creates buffers for all the
- * pages, and the filesystems mark these buffers as BH_New if they
- * were newly allocated from disk. We use the BH_New flag similarly. */
-static int filter_commit_write(struct niobuf_local *lnb, int err)
+ * Caller must hold obd_osfs_lock. */
+static int filter_grant_check(struct obd_export *exp, int objcount,
+ struct fsfilt_objinfo *fso, int niocount,
+ struct niobuf_remote *rnb,
+ struct niobuf_local *lnb, obd_size *left,
+ struct inode *inode)
{
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
- if (err) {
- unsigned block_start, block_end;
- struct buffer_head *bh, *head = lnb->page->buffers;
- unsigned blocksize = head->b_size;
-
- /* debugging: just seeing if this ever happens */
- CDEBUG(err == -ENOSPC ? D_INODE : D_ERROR,
- "called for ino %lu:%lu on err %d\n",
- lnb->page->mapping->host->i_ino, lnb->page->index, err);
-
- /* Currently one buffer per page, but in the future... */
- for (bh = head, block_start = 0; bh != head || !block_start;
- block_start = block_end, bh = bh->b_this_page) {
- block_end = block_start + blocksize;
- if (buffer_new(bh)) {
- memset(kmap(lnb->page) + block_start, 0,
- blocksize);
- kunmap(lnb->page);
+ struct filter_export_data *fed = &exp->exp_filter_data;
+ int blocksize = exp->exp_obd->u.filter.fo_sb->s_blocksize;
+ unsigned long used = 0, ungranted = 0, using;
+ int i, rc = -ENOSPC, obj, n = 0, mask = D_CACHE;
+
+ LASSERT_SPIN_LOCKED(&exp->exp_obd->obd_osfs_lock);
+
+ for (obj = 0; obj < objcount; obj++) {
+ for (i = 0; i < fso[obj].fso_bufcnt; i++, n++) {
+ int tmp, bytes;
+
+ /* FIXME: this is calculated with PAGE_SIZE on client */
+ bytes = rnb[n].len;
+ bytes += rnb[n].offset & (blocksize - 1);
+ tmp = (rnb[n].offset + rnb[n].len) & (blocksize - 1);
+ if (tmp)
+ bytes += blocksize - tmp;
+
+ if (rnb[n].flags & OBD_BRW_FROM_GRANT) {
+ if (fed->fed_grant < used + bytes) {
+ CDEBUG(D_CACHE,
+ "%s: cli %s/%p claims %ld+%d "
+ "GRANT, real grant %lu idx %d\n",
+ exp->exp_obd->obd_name,
+ exp->exp_client_uuid.uuid, exp,
+ used, bytes, fed->fed_grant, n);
+ mask = D_ERROR;
+ } else {
+ used += bytes;
+ rnb[n].flags |= OBD_BRW_GRANTED;
+ lnb[n].lnb_grant_used = bytes;
+ CDEBUG(0, "idx %d used=%lu\n", n, used);
+ rc = 0;
+ continue;
+ }
+ }
+ if (*left > ungranted) {
+ /* if enough space, pretend it was granted */
+ ungranted += bytes;
+ rnb[n].flags |= OBD_BRW_GRANTED;
+ CDEBUG(0, "idx %d ungranted=%lu\n",n,ungranted);
+ rc = 0;
+ continue;
}
+
+ /* We can't check for already-mapped blocks here, as
+ * it requires dropping the osfs lock to do the bmap.
+ * Instead, we return ENOSPC and in that case we need
+ * to go through and verify if all of the blocks not
+ * marked BRW_GRANTED are already mapped and we can
+ * ignore this error. */
+ lnb[n].rc = -ENOSPC;
+ rnb[n].flags &= OBD_BRW_GRANTED;
+ CDEBUG(D_CACHE,"%s: cli %s/%p idx %d no space for %d\n",
+ exp->exp_obd->obd_name,
+ exp->exp_client_uuid.uuid, exp, n, bytes);
}
}
-#endif
- return lustre_commit_write(lnb);
+
+ /* Now substract what client have used already. We don't subtract
+ * this from the tot_granted yet, so that other client's can't grab
+ * that space before we have actually allocated our blocks. That
+ * happens in filter_grant_commit() after the writes are done. */
+ *left -= ungranted;
+ fed->fed_grant -= used;
+ fed->fed_pending += used;
+ exp->exp_obd->u.filter.fo_tot_pending += used;
+
+ CDEBUG(mask,
+ "%s: cli %s/%p used: %lu ungranted: %lu grant: %lu dirty: %lu\n",
+ exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp, used,
+ ungranted, fed->fed_grant, fed->fed_dirty);
+
+ /* Rough calc in case we don't refresh cached statfs data */
+ using = (used + ungranted + 1 ) >>
+ exp->exp_obd->u.filter.fo_sb->s_blocksize_bits;
+ if (exp->exp_obd->obd_osfs.os_bavail > using)
+ exp->exp_obd->obd_osfs.os_bavail -= using;
+ else
+ exp->exp_obd->obd_osfs.os_bavail = 0;
+
+ if (fed->fed_dirty < used) {
+ CERROR("%s: cli %s/%p claims used %lu > fed_dirty %lu\n",
+ exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp,
+ used, fed->fed_dirty);
+ used = fed->fed_dirty;
+ }
+ exp->exp_obd->u.filter.fo_tot_dirty -= used;
+ fed->fed_dirty -= used;
+
+ return rc;
+}
+
+static int filter_start_page_write(struct inode *inode,
+ struct niobuf_local *lnb)
+{
+ struct page *page = alloc_pages(GFP_HIGHUSER, 0);
+ if (page == NULL) {
+ CERROR("no memory for a temp page\n");
+ RETURN(lnb->rc = -ENOMEM);
+ }
+ POISON_PAGE(page, 0xf1);
+ if (lnb->len != PAGE_SIZE) {
+ memset(kmap(page) + lnb->len, 0, PAGE_SIZE - lnb->len);
+ kunmap(page);
+ }
+ page->index = lnb->offset >> PAGE_SHIFT;
+ lnb->page = page;
+
+ return 0;
}
/* If we ever start to support multi-object BRW RPCs, we will need to get locks
struct obd_trans_info *oti)
{
struct obd_run_ctxt saved;
- struct obd_ioobj *o;
struct niobuf_remote *rnb;
struct niobuf_local *lnb;
- struct fsfilt_objinfo *fso;
+ struct fsfilt_objinfo fso;
struct dentry *dentry;
- int pglocked = 0, rc = 0, i, j, tot_bytes = 0;
+ obd_size left;
unsigned long now = jiffies;
+ int rc = 0, i, tot_bytes = 0, cleanup_phase = 1;
ENTRY;
LASSERT(objcount == 1);
-
- OBD_ALLOC(fso, objcount * sizeof(*fso));
- if (fso == NULL)
- RETURN(-ENOMEM);
+ LASSERT(obj->ioo_bufcnt > 0);
memset(res, 0, niocount * sizeof(*res));
- push_ctxt(&saved, &exp->exp_obd->u.filter.fo_ctxt, NULL);
- for (i = 0, o = obj; i < objcount; i++, o++) {
- struct filter_dentry_data *fdd;
- LASSERT(o->ioo_bufcnt);
-
- dentry = filter_oa2dentry(exp->exp_obd, oa);
- if (IS_ERR(dentry))
- GOTO(out_objinfo, rc = PTR_ERR(dentry));
+ push_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
+ dentry = filter_fid2dentry(exp->exp_obd, NULL, obj->ioo_gr,
+ obj->ioo_id);
+ if (IS_ERR(dentry))
+ GOTO(cleanup, rc = PTR_ERR(dentry));
+
+ if (dentry->d_inode == NULL) {
+ CERROR("trying to BRW to non-existent file "LPU64"\n",
+ obj->ioo_id);
+ f_dput(dentry);
+ GOTO(cleanup, rc = -ENOENT);
+ }
- if (dentry->d_inode == NULL) {
- CERROR("trying to BRW to non-existent file "LPU64"\n",
- o->ioo_id);
- f_dput(dentry);
- GOTO(out_objinfo, rc = -ENOENT);
- }
+ fso.fso_dentry = dentry;
+ fso.fso_bufcnt = obj->ioo_bufcnt;
- fso[i].fso_dentry = dentry;
- fso[i].fso_bufcnt = o->ioo_bufcnt;
+ if (time_after(jiffies, now + 15 * HZ))
+ CERROR("slow preprw_write setup %lus\n", (jiffies - now) / HZ);
+ else
+ CDEBUG(D_INFO, "preprw_write setup: %lu jiffies\n",
+ (jiffies - now));
- down(&dentry->d_inode->i_sem);
- fdd = dentry->d_fsdata;
- if (fdd == NULL || !atomic_read(&fdd->fdd_open_count))
- CDEBUG(D_PAGE, "I/O to unopened object "LPU64"\n",
- o->ioo_id);
- }
+ spin_lock(&exp->exp_obd->obd_osfs_lock);
+ if (oa)
+ filter_grant_incoming(exp, oa);
+ cleanup_phase = 0;
- if (time_after(jiffies, now + 15 * HZ))
- CERROR("slow prep setup %lus\n", (jiffies - now) / HZ);
-
- LASSERT(oti != NULL);
- oti->oti_handle = fsfilt_brw_start(exp->exp_obd, objcount, fso,
- niocount, oti);
- if (IS_ERR(oti->oti_handle)) {
- rc = PTR_ERR(oti->oti_handle);
- CDEBUG(rc == -ENOSPC ? D_INODE : D_ERROR,
- "error starting transaction: rc = %d\n", rc);
- oti->oti_handle = NULL;
- GOTO(out_objinfo, rc);
- }
+ left = filter_grant_space_left(exp);
- for (i = 0, o = obj, rnb = nb, lnb = res; i < objcount; i++, o++) {
- dentry = fso[i].fso_dentry;
- for (j = 0; j < o->ioo_bufcnt; j++, rnb++, lnb++) {
- if (j == 0)
- lnb->dentry = dentry;
- else
- lnb->dentry = dget(dentry);
+ rc = filter_grant_check(exp, objcount, &fso, niocount, nb, res,
+ &left, dentry->d_inode);
+ if (oa && oa->o_valid & OBD_MD_FLGRANT)
+ oa->o_grant = filter_grant(exp,oa->o_grant,oa->o_undirty,left);
- lnb->offset = rnb->offset;
- lnb->len = rnb->len;
- lnb->flags = rnb->flags;
- lnb->start = jiffies;
+ spin_unlock(&exp->exp_obd->obd_osfs_lock);
- rc = filter_get_page_write(dentry->d_inode, lnb,
- &pglocked);
- if (rc)
- up(&dentry->d_inode->i_sem);
+ if (rc) {
+ f_dput(dentry);
+ GOTO(cleanup, rc);
+ }
- if (rc) {
- CDEBUG(rc == -ENOSPC ? D_INODE : D_ERROR,
- "page err %u@"LPU64" %u/%u %p: rc %d\n",
- lnb->len, lnb->offset, j, o->ioo_bufcnt,
- dentry, rc);
- f_dput(dentry);
- GOTO(out_pages, rc);
- }
- tot_bytes += lnb->len;
+ for (i = 0, rnb = nb, lnb = res; i < obj->ioo_bufcnt;
+ i++, lnb++, rnb++) {
+ /* We still set up for ungranted pages so that granted pages
+ * can be written to disk as they were promised, and portals
+ * needs to keep the pages all aligned properly. */
+ lnb->dentry = dentry;
+ lnb->offset = rnb->offset;
+ lnb->len = rnb->len;
+ lnb->flags = rnb->flags;
+
+ rc = filter_start_page_write(dentry->d_inode, lnb);
+ if (rc) {
+ CDEBUG(D_ERROR, "page err %u@"LPU64" %u/%u %p: rc %d\n",
+ lnb->len, lnb->offset,
+ i, obj->ioo_bufcnt, dentry, rc);
+ while (lnb-- > res)
+ __free_pages(lnb->page, 0);
+ f_dput(dentry);
+ GOTO(cleanup, rc);
}
+ if (lnb->rc == 0)
+ tot_bytes += lnb->len;
}
if (time_after(jiffies, now + 15 * HZ))
- CERROR("slow prep get page %lus\n", (jiffies - now) / HZ);
+ CERROR("slow start_page_write %lus\n", (jiffies - now) / HZ);
+ else
+ CDEBUG(D_INFO, "start_page_write: %lu jiffies\n",
+ (jiffies - now));
lprocfs_counter_add(exp->exp_obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
tot_bytes);
-
EXIT;
-out:
- OBD_FREE(fso, objcount * sizeof(*fso));
- /* we saved the journal handle into oti->oti_handle instead */
- current->journal_info = NULL;
- pop_ctxt(&saved, &exp->exp_obd->u.filter.fo_ctxt, NULL);
- return rc;
-
-out_pages:
- while (lnb-- > res) {
- filter_commit_write(lnb, rc);
- up(&lnb->dentry->d_inode->i_sem);
- f_dput(lnb->dentry);
- }
- filter_finish_transno(exp, oti, rc);
- fsfilt_commit(exp->exp_obd,
- filter_parent(exp->exp_obd,S_IFREG,obj->ioo_id)->d_inode,
- oti->oti_handle, 0);
- goto out; /* dropped the dentry refs already (one per page) */
-
-out_objinfo:
- for (i = 0; i < objcount && fso[i].fso_dentry; i++) {
- up(&fso[i].fso_dentry->d_inode->i_sem);
- f_dput(fso[i].fso_dentry);
+cleanup:
+ switch(cleanup_phase) {
+ case 1:
+ spin_lock(&exp->exp_obd->obd_osfs_lock);
+ if (oa)
+ filter_grant_incoming(exp, oa);
+ spin_unlock(&exp->exp_obd->obd_osfs_lock);
+ default: ;
}
- goto out;
+ pop_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
+ return rc;
}
int filter_preprw(int cmd, struct obd_export *exp, struct obdo *oa,
niocount, nb, res, oti);
LBUG();
-
return -EPROTO;
}
-/* It is highly unlikely that we would ever get an error here. The page we want
- * to get was previously locked, so it had to have already allocated the space,
- * and we were just writing over the same data, so there would be no hole in the
- * file.
- *
- * XXX: possibility of a race with truncate could exist, need to check that.
- * There are no guarantees w.r.t. write order even on a local filesystem,
- * although the normal response would be to return the number of bytes
- * successfully written and leave the rest to the app. */
-static int filter_write_locked_page(struct niobuf_local *lnb)
-{
- struct page *lpage;
- void *lpage_addr, *lnb_addr;
- int rc;
- ENTRY;
-
- lpage = lustre_get_page_write(lnb->dentry->d_inode, lnb->page->index);
- if (IS_ERR(lpage)) {
- rc = PTR_ERR(lpage);
- CERROR("error getting locked page index %ld: rc = %d\n",
- lnb->page->index, rc);
- LBUG();
- lustre_commit_write(lnb);
- RETURN(rc);
- }
-
- /* 2 kmaps == vanishingly small deadlock opportunity */
- lpage_addr = kmap(lpage);
- lnb_addr = kmap(lnb->page);
-
- memcpy(lpage_addr, lnb_addr, PAGE_SIZE);
-
- kunmap(lnb->page);
- kunmap(lpage);
-
- page_cache_release(lnb->page);
-
- lnb->page = lpage;
- rc = lustre_commit_write(lnb);
- if (rc)
- CERROR("error committing locked page %ld: rc = %d\n",
- lnb->page->index, rc);
- RETURN(rc);
-}
-
-int filter_commitrw(int cmd, struct obd_export *exp, struct obdo *oa,
- int objcount, struct obd_ioobj *obj, int niocount,
- struct niobuf_local *res, struct obd_trans_info *oti)
+static int filter_commitrw_read(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_run_ctxt saved;
struct obd_ioobj *o;
struct niobuf_local *lnb;
- struct obd_device *obd = exp->exp_obd;
- int found_locked = 0, rc = 0, i;
- int nested_trans = current->journal_info != NULL;
- unsigned long now = jiffies; /* DEBUGGING OST TIMEOUTS */
+ int i, j, drop = 0;
ENTRY;
- push_ctxt(&saved, &obd->u.filter.fo_ctxt, NULL);
-
- if (cmd & OBD_BRW_WRITE) {
- LASSERT(oti);
- LASSERT(current->journal_info == NULL ||
- current->journal_info == oti->oti_handle);
- current->journal_info = oti->oti_handle;
- }
+ if (res->dentry != NULL)
+ drop = (res->dentry->d_inode->i_size >
+ exp->exp_obd->u.filter.fo_readcache_max_filesize);
for (i = 0, o = obj, lnb = res; i < objcount; i++, o++) {
- struct inode *inode;
- int j;
-
- /* If all of the page reads were beyond EOF, let's pretend
- * this read didn't really happen at all. */
- if (lnb->dentry == NULL) {
- oa->o_valid = OBD_MD_FLID|(oa->o_valid&OBD_MD_FLCKSUM);
- continue;
- }
-
- inode = igrab(lnb->dentry->d_inode);
-
- if (cmd & OBD_BRW_WRITE) {
- /* FIXME: MULTI OBJECT BRW */
- if (oa && oa->o_valid & (OBD_MD_FLMTIME|OBD_MD_FLCTIME))
- obdo_refresh_inode(inode, oa, OBD_MD_FLATIME |
- OBD_MD_FLMTIME |
- OBD_MD_FLCTIME);
- else
- inode_update_time(lnb->dentry->d_inode, 1);
- } else if (oa && oa->o_valid & OBD_MD_FLATIME) {
- /* Note that we don't necessarily write this to disk */
- obdo_refresh_inode(inode, oa, OBD_MD_FLATIME);
- }
-
for (j = 0 ; j < o->ioo_bufcnt ; j++, lnb++) {
- if (lnb->page == NULL) {
+ if (lnb->page == NULL)
continue;
+ /* drop from cache like truncate_list_pages() */
+ if (drop && !TryLockPage(lnb->page)) {
+ if (lnb->page->mapping)
+ ll_truncate_complete_page(lnb->page);
+ unlock_page(lnb->page);
}
-
- if (lnb->flags & N_LOCAL_TEMP_PAGE) {
- found_locked++;
- continue;
- }
-
- if (time_after(jiffies, lnb->start + 15 * HZ))
- CERROR("slow commitrw %lusi (%lus)\n",
- (jiffies - lnb->start) / HZ,
- (jiffies - now) / HZ);
-
- if (cmd & OBD_BRW_WRITE) {
- int err = filter_commit_write(lnb, 0);
-
- if (!rc)
- rc = err;
- } else {
- page_cache_release(lnb->page);
- }
-
- f_dput(lnb->dentry);
- if (time_after(jiffies, lnb->start + 15 * HZ))
- CERROR("slow commit_write %lus (%lus)\n",
- (jiffies - lnb->start) / HZ,
- (jiffies - now) / HZ);
- }
-
- /* FIXME: MULTI OBJECT BRW */
- if (oa) {
- oa->o_valid = OBD_MD_FLID|(oa->o_valid&OBD_MD_FLCKSUM);
- obdo_from_inode(oa, inode, FILTER_VALID_FLAGS);
+ page_cache_release(lnb->page);
}
-
- if (cmd & OBD_BRW_WRITE)
- up(&inode->i_sem);
-
- iput(inode);
}
- for (i = 0, o = obj, lnb = res; found_locked > 0 && i < objcount;
- i++, o++) {
- int j;
+ if (res->dentry != NULL)
+ f_dput(res->dentry);
+ RETURN(rc);
+}
- for (j = 0 ; j < o->ioo_bufcnt ; j++, lnb++) {
- int err;
- if (!(lnb->flags & N_LOCAL_TEMP_PAGE))
- continue;
+void flip_into_page_cache(struct inode *inode, struct page *new_page)
+{
+ struct page *old_page;
+ int rc;
- if (time_after(jiffies, lnb->start + 15 * HZ))
- CERROR("slow commitrw locked %lus (%lus)\n",
- (jiffies - lnb->start) / HZ,
- (jiffies - now) / HZ);
-
- err = filter_write_locked_page(lnb);
- if (!rc)
- rc = err;
- f_dput(lnb->dentry);
- found_locked--;
-
- if (time_after(jiffies, lnb->start + 15 * HZ))
- CERROR("slow commit_write locked %lus (%lus)\n",
- (jiffies - lnb->start) / HZ,
- (jiffies - now) / HZ);
+ do {
+ /* the dlm is protecting us from read/write concurrency, so we
+ * expect this find_lock_page to return quickly. even if we
+ * race with another writer it won't be doing much work with
+ * the page locked. we do this 'cause t_c_p expects a
+ * locked page, and it wants to grab the pagecache lock
+ * as well. */
+ old_page = find_lock_page(inode->i_mapping, new_page->index);
+ if (old_page) {
+ ll_truncate_complete_page(old_page);
+ unlock_page(old_page);
+ page_cache_release(old_page);
}
- }
- if (cmd & OBD_BRW_WRITE) {
- /* We just want any dentry for the commit, for now */
- struct dentry *dparent = filter_parent(obd, S_IFREG, 0);
- int err;
-
- rc = filter_finish_transno(exp, oti, rc);
- err = fsfilt_commit(obd, dparent->d_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);
- }
+#if 0 /* this should be a /proc tunable someday */
+ /* racing o_directs (no locking ioctl) could race adding
+ * their pages, so we repeat the page invalidation unless
+ * we successfully added our new page */
+ rc = add_to_page_cache_unique(new_page, inode->i_mapping,
+ new_page->index,
+ page_hash(inode->i_mapping,
+ new_page->index));
+ if (rc == 0) {
+ /* add_to_page_cache clears uptodate|dirty and locks
+ * the page */
+ SetPageUptodate(new_page);
+ unlock_page(new_page);
+ }
+#else
+ rc = 0;
+#endif
+ } while (rc != 0);
+}
- LASSERT(nested_trans || current->journal_info == NULL);
- pop_ctxt(&saved, &obd->u.filter.fo_ctxt, NULL);
- RETURN(rc);
+void filter_grant_commit(struct obd_export *exp, int niocount,
+ struct niobuf_local *res)
+{
+ struct filter_obd *filter = &exp->exp_obd->u.filter;
+ struct niobuf_local *lnb = res;
+ unsigned long pending = 0;
+ int i;
+
+ spin_lock(&exp->exp_obd->obd_osfs_lock);
+ for (i = 0, lnb = res; i < niocount; i++, lnb++)
+ pending += lnb->lnb_grant_used;
+
+ LASSERTF(exp->exp_filter_data.fed_pending >= pending,
+ "%s: cli %s/%p fed_pending: %lu grant_used: %lu\n",
+ exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp,
+ exp->exp_filter_data.fed_pending, pending);
+ exp->exp_filter_data.fed_pending -= pending;
+ LASSERTF(filter->fo_tot_granted >= pending,
+ "%s: cli %s/%p tot_granted: "LPU64" grant_used: %lu\n",
+ exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp,
+ exp->exp_obd->u.filter.fo_tot_granted, pending);
+ filter->fo_tot_granted -= pending;
+ LASSERTF(filter->fo_tot_pending >= pending,
+ "%s: cli %s/%p tot_pending: "LPU64" grant_used: %lu\n",
+ exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp,
+ filter->fo_tot_pending, pending);
+ filter->fo_tot_pending -= pending;
+
+ spin_unlock(&exp->exp_obd->obd_osfs_lock);
+}
+
+int filter_commitrw(int cmd, 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)
+{
+ if (cmd == OBD_BRW_WRITE)
+ return filter_commitrw_write(exp, oa, objcount, obj, niocount,
+ res, oti, rc);
+ if (cmd == OBD_BRW_READ)
+ return filter_commitrw_read(exp, oa, objcount, obj, niocount,
+ res, oti, rc);
+ LBUG();
+ return -EPROTO;
}
-int filter_brw(int cmd, struct lustre_handle *conn, struct obdo *oa,
+int filter_brw(int cmd, struct obd_export *exp, struct obdo *oa,
struct lov_stripe_md *lsm, obd_count oa_bufs,
struct brw_page *pga, struct obd_trans_info *oti)
{
- struct obd_export *exp;
struct obd_ioobj ioo;
struct niobuf_local *lnb;
struct niobuf_remote *rnb;
int ret = 0;
ENTRY;
- exp = class_conn2export(conn);
- if (exp == NULL) {
- CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",conn->cookie);
- RETURN(-EINVAL);
- }
-
OBD_ALLOC(lnb, oa_bufs * sizeof(struct niobuf_local));
OBD_ALLOC(rnb, oa_bufs * sizeof(struct niobuf_remote));
rnb[i].len = pga[i].count;
}
- ioo.ioo_id = oa->o_id;
- ioo.ioo_gr = 0;
- ioo.ioo_type = oa->o_mode & S_IFMT;
+ obdo_to_ioobj(oa, &ioo);
ioo.ioo_bufcnt = oa_bufs;
ret = filter_preprw(cmd, exp, oa, 1, &ioo, oa_bufs, rnb, lnb, oti);
else
memcpy(virt + off, addr + off, pga[i].count);
- kunmap(addr);
- kunmap(virt);
+ kunmap(lnb[i].page);
+ kunmap(pga[i].pg);
}
- ret = filter_commitrw(cmd, exp, oa, 1, &ioo, oa_bufs, lnb, oti);
+ ret = filter_commitrw(cmd, exp, oa, 1, &ioo, oa_bufs, lnb, oti, ret);
out:
if (lnb)
OBD_FREE(lnb, oa_bufs * sizeof(struct niobuf_local));
if (rnb)
OBD_FREE(rnb, oa_bufs * sizeof(struct niobuf_remote));
- class_export_put(exp);
RETURN(ret);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff