#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/smp_lock.h>
+/* current_is_kswapd() */
+#include <linux/swap.h>
#define DEBUG_SUBSYSTEM S_LLITE
#include "llite_internal.h"
#include <linux/lustre_compat25.h>
-#ifndef list_for_each_prev_safe
-#define list_for_each_prev_safe(pos, n, head) \
- for (pos = (head)->prev, n = pos->prev; pos != (head); \
- pos = n, n = pos->prev )
-#endif
-
-cfs_mem_cache_t *ll_async_page_slab = NULL;
-size_t ll_async_page_slab_size = 0;
-
-/* SYNCHRONOUS I/O to object storage for an inode */
-static int ll_brw(int cmd, struct inode *inode, struct obdo *oa,
- struct page *page, int flags)
-{
- struct ll_inode_info *lli = ll_i2info(inode);
- struct lov_stripe_md *lsm = lli->lli_smd;
- struct obd_info oinfo = { { { 0 } } };
- struct brw_page pg;
- int opc, rc;
- ENTRY;
-
- pg.pg = page;
- pg.off = ((obd_off)page->index) << CFS_PAGE_SHIFT;
-
- if ((cmd & OBD_BRW_WRITE) && (pg.off+CFS_PAGE_SIZE>i_size_read(inode)))
- pg.count = i_size_read(inode) % CFS_PAGE_SIZE;
- else
- pg.count = CFS_PAGE_SIZE;
-
- LL_CDEBUG_PAGE(D_PAGE, page, "%s %d bytes ino %lu at "LPU64"/"LPX64"\n",
- cmd & OBD_BRW_WRITE ? "write" : "read", pg.count,
- inode->i_ino, pg.off, pg.off);
- if (pg.count == 0) {
- CERROR("ZERO COUNT: ino %lu: size %p:%Lu(%p:%Lu) idx %lu off "
- LPU64"\n", inode->i_ino, inode, i_size_read(inode),
- page->mapping->host, i_size_read(page->mapping->host),
- page->index, pg.off);
- }
-
- pg.flag = flags;
-
- if (cmd & OBD_BRW_WRITE)
- ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_BRW_WRITE,
- pg.count);
- else
- ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_BRW_READ,
- pg.count);
- oinfo.oi_oa = oa;
- oinfo.oi_md = lsm;
- /* NB partial write, so we might not have CAPA_OPC_OSS_READ capa */
- opc = cmd & OBD_BRW_WRITE ? CAPA_OPC_OSS_WRITE : CAPA_OPC_OSS_RW;
- oinfo.oi_capa = ll_osscapa_get(inode, opc);
- rc = obd_brw(cmd, ll_i2dtexp(inode), &oinfo, 1, &pg, NULL);
- capa_put(oinfo.oi_capa);
- if (rc == 0)
- obdo_to_inode(inode, oa, OBD_MD_FLBLOCKS);
- else if (rc != -EIO)
- CERROR("error from obd_brw: rc = %d\n", rc);
- RETURN(rc);
-}
-
-int ll_file_punch(struct inode * inode, loff_t new_size, int srvlock)
-{
- struct ll_inode_info *lli = ll_i2info(inode);
- struct obd_info oinfo = { { { 0 } } };
- struct obdo oa;
- int rc;
-
- ENTRY;
- CDEBUG(D_INFO, "calling punch for "LPX64" (new size %Lu=%#Lx)\n",
- lli->lli_smd->lsm_object_id, i_size_read(inode), i_size_read(inode));
-
- oinfo.oi_md = lli->lli_smd;
- oinfo.oi_policy.l_extent.start = new_size;
- oinfo.oi_policy.l_extent.end = OBD_OBJECT_EOF;
- oinfo.oi_oa = &oa;
- oa.o_id = lli->lli_smd->lsm_object_id;
- oa.o_gr = lli->lli_smd->lsm_object_gr;
- oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
- if (srvlock) {
- /* set OBD_MD_FLFLAGS in o_valid, only if we
- * set OBD_FL_TRUNCLOCK, otherwise ost_punch
- * and filter_setattr get confused, see the comment
- * in ost_punch */
- oa.o_flags = OBD_FL_TRUNCLOCK;
- oa.o_valid |= OBD_MD_FLFLAGS;
- }
- obdo_from_inode(&oa, inode, OBD_MD_FLTYPE | OBD_MD_FLMODE |
- OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME |
- OBD_MD_FLFID | OBD_MD_FLGENER);
-
- oinfo.oi_capa = ll_osscapa_get(inode, CAPA_OPC_OSS_TRUNC);
- rc = obd_punch_rqset(ll_i2dtexp(inode), &oinfo, NULL);
- ll_truncate_free_capa(oinfo.oi_capa);
- if (rc)
- CERROR("obd_truncate fails (%d) ino %lu\n", rc, inode->i_ino);
- else
- obdo_to_inode(inode, &oa, OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
- OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME);
- RETURN(rc);
-}
-
/* this isn't where truncate starts. roughly:
* sys_truncate->ll_setattr_raw->vmtruncate->ll_truncate. setattr_raw grabs
* DLM lock on [size, EOF], i_mutex, ->lli_size_sem, and WRITE_I_ALLOC_SEM to
void ll_truncate(struct inode *inode)
{
struct ll_inode_info *lli = ll_i2info(inode);
- int srvlock = !!(lli->lli_flags & LLIF_SRVLOCK);
loff_t new_size;
ENTRY;
CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) to %Lu=%#Lx\n",inode->i_ino,
i_size_read(inode));
ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_TRUNC, 1);
- if (lli->lli_size_sem_owner != current) {
+ if (lli->lli_size_sem_owner != cfs_current()) {
EXIT;
return;
}
inode->i_ino);
GOTO(out_unlock, 0);
}
-
- LASSERT(atomic_read(&lli->lli_size_sem.count) <= 0);
-
- if (!srvlock) {
- struct ost_lvb lvb;
- int rc;
-
- /* XXX I'm pretty sure this is a hack to paper
- * over a more fundamental race condition. */
- lov_stripe_lock(lli->lli_smd);
- inode_init_lvb(inode, &lvb);
- rc = obd_merge_lvb(ll_i2dtexp(inode), lli->lli_smd, &lvb, 0);
- if (lvb.lvb_size == i_size_read(inode) && rc == 0) {
- CDEBUG(D_VFSTRACE, "skipping punch for obj "LPX64
- ",%Lu=%#Lx\n", lli->lli_smd->lsm_object_id,
- i_size_read(inode), i_size_read(inode));
- lov_stripe_unlock(lli->lli_smd);
- GOTO(out_unlock, 0);
- }
- obd_adjust_kms(ll_i2dtexp(inode), lli->lli_smd,
- i_size_read(inode), 1);
- lov_stripe_unlock(lli->lli_smd);
- }
+ LASSERT_SEM_LOCKED(&lli->lli_size_sem);
if (unlikely((ll_i2sbi(inode)->ll_flags & LL_SBI_CHECKSUM) &&
(i_size_read(inode) & ~CFS_PAGE_MASK))) {
i_size_read(inode) >>
CFS_PAGE_SHIFT);
if (page != NULL) {
+#if 0 /* XXX */
struct ll_async_page *llap = llap_cast_private(page);
if (llap != NULL) {
char *kaddr = kmap_atomic(page, KM_USER0);
kunmap_atomic(kaddr, KM_USER0);
}
page_cache_release(page);
+#endif
}
}
new_size = i_size_read(inode);
ll_inode_size_unlock(inode, 0);
- if (!srvlock)
- ll_file_punch(inode, new_size, 0);
- else
- ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_LOCKLESS_TRUNC, 1);
EXIT;
return;
ll_inode_size_unlock(inode, 0);
} /* ll_truncate */
-int ll_prepare_write(struct file *file, struct page *page, unsigned from,
- unsigned to)
-{
- struct inode *inode = page->mapping->host;
- struct ll_inode_info *lli = ll_i2info(inode);
- struct lov_stripe_md *lsm = lli->lli_smd;
- obd_off offset = ((obd_off)page->index) << CFS_PAGE_SHIFT;
- struct obd_info oinfo = { { { 0 } } };
- struct brw_page pga;
- struct obdo oa;
- struct ost_lvb lvb;
- int rc = 0;
- ENTRY;
-
- LASSERT(PageLocked(page));
- (void)llap_cast_private(page); /* assertion */
-
- /* Check to see if we should return -EIO right away */
- pga.pg = page;
- pga.off = offset;
- pga.count = CFS_PAGE_SIZE;
- pga.flag = 0;
-
- oa.o_mode = inode->i_mode;
- oa.o_id = lsm->lsm_object_id;
- oa.o_gr = lsm->lsm_object_gr;
- oa.o_valid = OBD_MD_FLID | OBD_MD_FLMODE |
- OBD_MD_FLTYPE | OBD_MD_FLGROUP;
- obdo_from_inode(&oa, inode, OBD_MD_FLFID | OBD_MD_FLGENER);
-
- oinfo.oi_oa = &oa;
- oinfo.oi_md = lsm;
- rc = obd_brw(OBD_BRW_CHECK, ll_i2dtexp(inode), &oinfo, 1, &pga, NULL);
- if (rc)
- RETURN(rc);
-
- if (PageUptodate(page)) {
- LL_CDEBUG_PAGE(D_PAGE, page, "uptodate\n");
- RETURN(0);
- }
-
- /* We're completely overwriting an existing page, so _don't_ set it up
- * to date until commit_write */
- if (from == 0 && to == CFS_PAGE_SIZE) {
- LL_CDEBUG_PAGE(D_PAGE, page, "full page write\n");
- POISON_PAGE(page, 0x11);
- RETURN(0);
- }
-
- /* If are writing to a new page, no need to read old data. The extent
- * locking will have updated the KMS, and for our purposes here we can
- * treat it like i_size. */
- lov_stripe_lock(lsm);
- inode_init_lvb(inode, &lvb);
- obd_merge_lvb(ll_i2dtexp(inode), lsm, &lvb, 1);
- lov_stripe_unlock(lsm);
- if (lvb.lvb_size <= offset) {
- char *kaddr = kmap_atomic(page, KM_USER0);
- LL_CDEBUG_PAGE(D_PAGE, page, "kms "LPU64" <= offset "LPU64"\n",
- lvb.lvb_size, offset);
- memset(kaddr, 0, CFS_PAGE_SIZE);
- kunmap_atomic(kaddr, KM_USER0);
- GOTO(prepare_done, rc = 0);
- }
-
- /* XXX could be an async ocp read.. read-ahead? */
- rc = ll_brw(OBD_BRW_READ, inode, &oa, page, 0);
- if (rc == 0) {
- /* bug 1598: don't clobber blksize */
- oa.o_valid &= ~(OBD_MD_FLSIZE | OBD_MD_FLBLKSZ);
- obdo_refresh_inode(inode, &oa, oa.o_valid);
- }
-
- EXIT;
- prepare_done:
- if (rc == 0)
- SetPageUptodate(page);
-
- return rc;
-}
-
/**
- * make page ready for ASYNC write
- * \param data - pointer to llap cookie
- * \param cmd - is OBD_BRW_* macroses
- *
- * \retval 0 is page successfully prepared to send
- * \retval -EAGAIN is page not need to send
+ * Initializes common cl-data at the typical address_space operation entry
+ * point.
*/
-static int ll_ap_make_ready(void *data, int cmd)
+static int ll_cl_init(struct file *file, struct page *vmpage,
+ struct lu_env **env,
+ struct cl_io **io, struct cl_page **page, int *refcheck)
{
- struct ll_async_page *llap;
- struct page *page;
- ENTRY;
-
- llap = llap_from_cookie(data);
- page = llap->llap_page;
-
- /* we're trying to write, but the page is locked.. come back later */
- if (TryLockPage(page))
- RETURN(-EAGAIN);
-
- LASSERTF(!(cmd & OBD_BRW_READ) || !PageWriteback(page),
- "cmd %x page %p ino %lu index %lu fl %lx\n", cmd, page,
- page->mapping->host->i_ino, page->index, page->flags);
-
- /* if we left PageDirty we might get another writepage call
- * in the future. list walkers are bright enough
- * to check page dirty so we can leave it on whatever list
- * its on. XXX also, we're called with the cli list so if
- * we got the page cache list we'd create a lock inversion
- * with the removepage path which gets the page lock then the
- * cli lock */
- LASSERTF(!PageWriteback(page),"cmd %x page %p ino %lu index %lu\n", cmd, page,
- page->mapping->host->i_ino, page->index);
- if(!clear_page_dirty_for_io(page)) {
- unlock_page(page);
- RETURN(-EAGAIN);
- }
-
- /* This actually clears the dirty bit in the radix tree.*/
- set_page_writeback(page);
-
- LL_CDEBUG_PAGE(D_PAGE, page, "made ready\n");
- page_cache_get(page);
-
- RETURN(0);
+ struct lu_env *_env;
+ struct cl_io *_io;
+ struct cl_page *_page;
+ struct cl_object *clob;
+
+ int result;
+
+ *env = NULL;
+ *io = NULL;
+ *page = NULL;
+
+ clob = ll_i2info(vmpage->mapping->host)->lli_clob;
+ LASSERT(clob != NULL);
+
+ _env = cl_env_get(refcheck);
+ if (!IS_ERR(env)) {
+ struct ccc_io *cio = ccc_env_io(_env);
+
+ *env = _env;
+ *io = _io = cio->cui_cl.cis_io;
+ if (_io != NULL) {
+ LASSERT(_io->ci_state == CIS_IO_GOING);
+ LASSERT(cio->cui_fd == LUSTRE_FPRIVATE(file));
+ _page = cl_page_find(_env, clob, vmpage->index, vmpage,
+ CPT_CACHEABLE);
+ if (!IS_ERR(_page)) {
+ *page = _page;
+ lu_ref_add(&_page->cp_reference, "cl_io", _io);
+ result = 0;
+ } else
+ result = PTR_ERR(_page);
+ } else
+ /*
+ * This is for a case where operation can be called
+ * either with or without cl_io created by the upper
+ * layer (e.g., ->prepare_write() called directly from
+ * loop-back driver).
+ */
+ result = -EALREADY;
+ } else
+ result = PTR_ERR(_env);
+ CDEBUG(D_VFSTRACE, "%lu@"DFID" -> %i %p %p %p\n",
+ vmpage->index, PFID(lu_object_fid(&clob->co_lu)), result,
+ *env, *io, *page);
+ return result;
}
-/* We have two reasons for giving llite the opportunity to change the
- * write length of a given queued page as it builds the RPC containing
- * the page:
- *
- * 1) Further extending writes may have landed in the page cache
- * since a partial write first queued this page requiring us
- * to write more from the page cache. (No further races are possible, since
- * by the time this is called, the page is locked.)
- * 2) We might have raced with truncate and want to avoid performing
- * write RPCs that are just going to be thrown away by the
- * truncate's punch on the storage targets.
- *
- * The kms serves these purposes as it is set at both truncate and extending
- * writes.
+/**
+ * Finalizes cl-data before exiting typical address_space operation. Dual to
+ * ll_cl_init().
*/
-static int ll_ap_refresh_count(void *data, int cmd)
-{
- struct ll_inode_info *lli;
- struct ll_async_page *llap;
- struct lov_stripe_md *lsm;
- struct page *page;
- struct inode *inode;
- struct ost_lvb lvb;
- __u64 kms;
- ENTRY;
-
- /* readpage queues with _COUNT_STABLE, shouldn't get here. */
- LASSERT(cmd != OBD_BRW_READ);
-
- llap = llap_from_cookie(data);
- page = llap->llap_page;
- inode = page->mapping->host;
- lli = ll_i2info(inode);
- lsm = lli->lli_smd;
-
- lov_stripe_lock(lsm);
- inode_init_lvb(inode, &lvb);
- obd_merge_lvb(ll_i2dtexp(inode), lsm, &lvb, 1);
- kms = lvb.lvb_size;
- lov_stripe_unlock(lsm);
-
- /* catch race with truncate */
- if (((__u64)page->index << CFS_PAGE_SHIFT) >= kms)
- return 0;
-
- /* catch sub-page write at end of file */
- if (((__u64)page->index << CFS_PAGE_SHIFT) + CFS_PAGE_SIZE > kms)
- return kms % CFS_PAGE_SIZE;
-
- return CFS_PAGE_SIZE;
-}
-
-void ll_inode_fill_obdo(struct inode *inode, int cmd, struct obdo *oa)
-{
- struct lov_stripe_md *lsm;
- obd_flag valid_flags;
-
- lsm = ll_i2info(inode)->lli_smd;
-
- oa->o_id = lsm->lsm_object_id;
- oa->o_gr = lsm->lsm_object_gr;
- oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
- valid_flags = OBD_MD_FLTYPE | OBD_MD_FLATIME;
- if (cmd & OBD_BRW_WRITE) {
- oa->o_valid |= OBD_MD_FLEPOCH;
- oa->o_easize = ll_i2info(inode)->lli_ioepoch;
-
- valid_flags |= OBD_MD_FLMTIME | OBD_MD_FLCTIME |
- OBD_MD_FLUID | OBD_MD_FLGID |
- OBD_MD_FLFID | OBD_MD_FLGENER;
- }
-
- obdo_from_inode(oa, inode, valid_flags);
-}
-
-static void ll_ap_fill_obdo(void *data, int cmd, struct obdo *oa)
-{
- struct ll_async_page *llap;
- ENTRY;
-
- llap = llap_from_cookie(data);
- ll_inode_fill_obdo(llap->llap_page->mapping->host, cmd, oa);
-
- EXIT;
-}
-
-static void ll_ap_update_obdo(void *data, int cmd, struct obdo *oa,
- obd_valid valid)
-{
- struct ll_async_page *llap;
- ENTRY;
-
- llap = llap_from_cookie(data);
- obdo_from_inode(oa, llap->llap_page->mapping->host, valid);
-
- EXIT;
-}
-
-static struct obd_capa *ll_ap_lookup_capa(void *data, int cmd)
-{
- int opc = cmd & OBD_BRW_WRITE ? CAPA_OPC_OSS_WRITE : CAPA_OPC_OSS_RW;
- struct ll_async_page *llap = llap_from_cookie(data);
-
- return ll_osscapa_get(llap->llap_page->mapping->host, opc);
-}
-
-static struct obd_async_page_ops ll_async_page_ops = {
- .ap_make_ready = ll_ap_make_ready,
- .ap_refresh_count = ll_ap_refresh_count,
- .ap_fill_obdo = ll_ap_fill_obdo,
- .ap_update_obdo = ll_ap_update_obdo,
- .ap_completion = ll_ap_completion,
- .ap_lookup_capa = ll_ap_lookup_capa,
-};
-
-struct ll_async_page *llap_cast_private(struct page *page)
-{
- struct ll_async_page *llap = (struct ll_async_page *)page_private(page);
-
- LASSERTF(llap == NULL || llap->llap_magic == LLAP_MAGIC,
- "page %p private %lu gave magic %d which != %d\n",
- page, page_private(page), llap->llap_magic, LLAP_MAGIC);
-
- return llap;
-}
-
-/* Try to reap @target pages in the specific @cpu's async page list.
- *
- * There is an llap attached onto every page in lustre, linked off @sbi.
- * We add an llap to the list so we don't lose our place during list walking.
- * If llaps in the list are being moved they will only move to the end
- * of the LRU, and we aren't terribly interested in those pages here (we
- * start at the beginning of the list where the least-used llaps are. */
-static inline int llap_shrink_cache_internal(struct ll_sb_info *sbi,
- int cpu, int target)
+static void ll_cl_fini(struct lu_env *env,
+ struct cl_io *io, struct cl_page *page, int *refcheck)
{
- struct ll_async_page *llap, dummy_llap = { .llap_magic = 0xd11ad11a };
- struct ll_pglist_data *pd;
- struct list_head *head;
- int count = 0;
-
- pd = ll_pglist_cpu_lock(sbi, cpu);
- head = &pd->llpd_list;
- list_add(&dummy_llap.llap_pglist_item, head);
- while (count < target) {
- struct page *page;
- int keep;
-
- if (unlikely(need_resched())) {
- ll_pglist_cpu_unlock(sbi, cpu);
- cond_resched();
- ll_pglist_cpu_lock(sbi, cpu);
- }
-
- llap = llite_pglist_next_llap(head,
- &dummy_llap.llap_pglist_item);
- list_del_init(&dummy_llap.llap_pglist_item);
- if (llap == NULL)
- break;
-
- page = llap->llap_page;
- LASSERT(page != NULL);
-
- list_add(&dummy_llap.llap_pglist_item, &llap->llap_pglist_item);
-
- /* Page needs/undergoing IO */
- if (TryLockPage(page)) {
- LL_CDEBUG_PAGE(D_PAGE, page, "can't lock\n");
- continue;
- }
-
- keep = (llap->llap_write_queued || PageDirty(page) ||
- PageWriteback(page) || (!PageUptodate(page) &&
- llap->llap_origin != LLAP_ORIGIN_READAHEAD));
-
- LL_CDEBUG_PAGE(D_PAGE, page,"%s LRU page: %s%s%s%s%s origin %s\n",
- keep ? "keep" : "drop",
- llap->llap_write_queued ? "wq " : "",
- PageDirty(page) ? "pd " : "",
- PageUptodate(page) ? "" : "!pu ",
- PageWriteback(page) ? "wb" : "",
- llap->llap_defer_uptodate ? "" : "!du",
- llap_origins[llap->llap_origin]);
-
- /* If page is dirty or undergoing IO don't discard it */
- if (keep) {
- unlock_page(page);
- continue;
- }
-
- page_cache_get(page);
- ll_pglist_cpu_unlock(sbi, cpu);
-
- if (page->mapping != NULL) {
- ll_teardown_mmaps(page->mapping,
- (__u64)page->index << CFS_PAGE_SHIFT,
- ((__u64)page->index << CFS_PAGE_SHIFT)|
- ~CFS_PAGE_MASK);
- if (!PageDirty(page) && !page_mapped(page)) {
- ll_ra_accounting(llap, page->mapping);
- ll_truncate_complete_page(page);
- ++count;
- } else {
- LL_CDEBUG_PAGE(D_PAGE, page, "Not dropping page"
- " because it is "
- "%s\n",
- PageDirty(page)?
- "dirty":"mapped");
+ if (page != NULL) {
+ lu_ref_del(&page->cp_reference, "cl_io", io);
+ cl_page_put(env, page);
+ }
+ if (env != NULL) {
+ struct vvp_io *vio;
+
+ vio = vvp_env_io(env);
+ LASSERT(vio->cui_oneshot >= 0);
+ if (vio->cui_oneshot > 0) {
+ if (--vio->cui_oneshot == 0) {
+ cl_io_end(env, io);
+ cl_io_unlock(env, io);
+ cl_io_iter_fini(env, io);
+ cl_io_fini(env, io);
+ /* to trigger assertion above, if ll_cl_fini()
+ * is called against freed io. */
+ vio->cui_oneshot = -1;
}
+ /* additional reference on env was acquired by io,
+ * disable refcheck */
+ refcheck = NULL;
}
- unlock_page(page);
- page_cache_release(page);
-
- ll_pglist_cpu_lock(sbi, cpu);
- }
- list_del(&dummy_llap.llap_pglist_item);
- ll_pglist_cpu_unlock(sbi, cpu);
-
- CDEBUG(D_CACHE, "shrank %d, expected %d however. \n", count, target);
- return count;
-}
-
-
-/* Try to shrink the page cache for the @sbi filesystem by 1/@shrink_fraction.
- *
- * At first, this code calculates total pages wanted by @shrink_fraction, then
- * it deduces how many pages should be reaped from each cpu in proportion as
- * their own # of page count(llpd_count).
- */
-int llap_shrink_cache(struct ll_sb_info *sbi, int shrink_fraction)
-{
- unsigned long total, want, percpu_want, count = 0;
- int cpu, nr_cpus;
-
- total = lcounter_read(&sbi->ll_async_page_count);
- if (total == 0)
- return 0;
-
-#ifdef HAVE_SHRINKER_CACHE
- want = shrink_fraction;
- if (want == 0)
- return total;
-#else
- /* There can be a large number of llaps (600k or more in a large
- * memory machine) so the VM 1/6 shrink ratio is likely too much.
- * Since we are freeing pages also, we don't necessarily want to
- * shrink so much. Limit to 40MB of pages + llaps per call. */
- if (shrink_fraction <= 0)
- want = total - sbi->ll_async_page_max + 32*num_online_cpus();
- else
- want = (total + shrink_fraction - 1) / shrink_fraction;
-#endif
-
- if (want > 40 << (20 - CFS_PAGE_SHIFT))
- want = 40 << (20 - CFS_PAGE_SHIFT);
-
- CDEBUG(D_CACHE, "shrinking %lu of %lu pages (1/%d)\n",
- want, total, shrink_fraction);
-
- nr_cpus = num_possible_cpus();
- cpu = sbi->ll_async_page_clock_hand;
- /* we at most do one round */
- do {
- int c;
-
- cpu = (cpu + 1) % nr_cpus;
- c = LL_PGLIST_DATA_CPU(sbi, cpu)->llpd_count;
- if (!cpu_online(cpu))
- percpu_want = c;
- else
- percpu_want = want / ((total / (c + 1)) + 1);
- if (percpu_want == 0)
- continue;
-
- count += llap_shrink_cache_internal(sbi, cpu, percpu_want);
- if (count >= want)
- sbi->ll_async_page_clock_hand = cpu;
- } while (cpu != sbi->ll_async_page_clock_hand);
-
- CDEBUG(D_CACHE, "shrank %lu/%lu and left %lu unscanned\n",
- count, want, total);
-
-#ifdef HAVE_SHRINKER_CACHE
- return lcounter_read(&sbi->ll_async_page_count);
-#else
- return count;
-#endif
+ cl_env_put(env, refcheck);
+ } else
+ LASSERT(io == NULL);
}
-/* Rebalance the async page queue len for each cpu. We hope that the cpu
- * which do much IO job has a relative longer queue len.
- * This function should be called with preempt disabled.
+/**
+ * Initializes one-shot cl_io for the case when loop driver calls
+ * ->{prepare,commit}_write() methods directly.
*/
-static inline int llap_async_cache_rebalance(struct ll_sb_info *sbi)
+static int ll_prepare_loop(struct lu_env *env, struct cl_io *io,
+ struct file *file, struct page *vmpage,
+ unsigned from, unsigned to)
{
- unsigned long sample = 0, *cpu_sample, bias, slice;
- struct ll_pglist_data *pd;
- cpumask_t mask;
- int cpu, surplus;
- int w1 = 7, w2 = 3, base = (w1 + w2); /* weight value */
- atomic_t *pcnt;
-
- if (!spin_trylock(&sbi->ll_async_page_reblnc_lock)) {
- /* someone else is doing the job */
- return 1;
- }
-
- pcnt = &LL_PGLIST_DATA(sbi)->llpd_sample_count;
- if (!atomic_read(pcnt)) {
- /* rare case, somebody else has gotten this job done */
- spin_unlock(&sbi->ll_async_page_reblnc_lock);
- return 1;
- }
-
- sbi->ll_async_page_reblnc_count++;
- cpu_sample = sbi->ll_async_page_sample;
- memset(cpu_sample, 0, num_possible_cpus() * sizeof(unsigned long));
- for_each_online_cpu(cpu) {
- pcnt = &LL_PGLIST_DATA_CPU(sbi, cpu)->llpd_sample_count;
- cpu_sample[cpu] = atomic_read(pcnt);
- atomic_set(pcnt, 0);
- sample += cpu_sample[cpu];
- }
+ struct vvp_io *vio;
+ struct ccc_io *cio;
+ int result;
+ loff_t pos;
- cpus_clear(mask);
- surplus = sbi->ll_async_page_max;
- slice = surplus / sample + 1;
- sample /= num_online_cpus();
- bias = sample >> 4;
- for_each_online_cpu(cpu) {
- pd = LL_PGLIST_DATA_CPU(sbi, cpu);
- if (labs((long int)sample - cpu_sample[cpu]) > bias) {
- unsigned long budget = pd->llpd_budget;
- /* weighted original queue length and expected queue
- * length to avoid thrashing. */
- pd->llpd_budget = (budget * w1) / base +
- (slice * cpu_sample[cpu]) * w2 / base;
- cpu_set(cpu, mask);
- }
- surplus -= pd->llpd_budget;
- }
- surplus /= cpus_weight(mask) ?: 1;
- for_each_cpu_mask(cpu, mask)
- LL_PGLIST_DATA_CPU(sbi, cpu)->llpd_budget += surplus;
- spin_unlock(&sbi->ll_async_page_reblnc_lock);
-
- /* TODO: do we really need to call llap_shrink_cache_internal
- * for every cpus with its page_count greater than budget?
- * for_each_cpu_mask(cpu, mask)
- * ll_shrink_cache_internal(...)
+ vio = vvp_env_io(env);
+ cio = ccc_env_io(env);
+ ll_io_init(io, file, 1);
+ pos = (vmpage->index << CFS_PAGE_SHIFT) + from;
+ /*
+ * Create IO and quickly drive it through CIS_{INIT,IT_STARTED,LOCKED}
+ * states. DLM locks are not taken for vio->cui_oneshot IO---we cannot
+ * take DLM locks here, because page is already locked. With new
+ * ->write_{being,end}() address_space operations lustre might be
+ * luckier.
*/
-
- return 0;
-}
-
-static struct ll_async_page *llap_from_page_with_lockh(struct page *page,
- unsigned origin,
- struct lustre_handle *lockh)
-{
- struct ll_async_page *llap;
- struct obd_export *exp;
- struct inode *inode = page->mapping->host;
- struct ll_sb_info *sbi;
- struct ll_pglist_data *pd;
- int rc, cpu, target;
- ENTRY;
-
- if (!inode) {
- static int triggered;
-
- if (!triggered) {
- LL_CDEBUG_PAGE(D_ERROR, page, "Bug 10047. Wrong anon "
- "page received\n");
- libcfs_debug_dumpstack(NULL);
- triggered = 1;
- }
- RETURN(ERR_PTR(-EINVAL));
- }
- sbi = ll_i2sbi(inode);
- LASSERT(ll_async_page_slab);
- LASSERTF(origin < LLAP__ORIGIN_MAX, "%u\n", origin);
-
- llap = llap_cast_private(page);
- if (llap != NULL) {
- /* move to end of LRU list, except when page is just about to
- * die */
- if (origin != LLAP_ORIGIN_REMOVEPAGE) {
- int old_cpu = llap->llap_pglist_cpu;
- struct ll_pglist_data *old_pd;
-
- pd = ll_pglist_double_lock(sbi, old_cpu, &old_pd);
- pd->llpd_hit++;
- while (old_cpu != llap->llap_pglist_cpu) {
- /* rarely case, someone else is touching this
- * page too. */
- ll_pglist_double_unlock(sbi, old_cpu);
- old_cpu = llap->llap_pglist_cpu;
- pd=ll_pglist_double_lock(sbi, old_cpu, &old_pd);
- }
-
- list_move(&llap->llap_pglist_item,
- &pd->llpd_list);
- old_pd->llpd_gen++;
- if (pd->llpd_cpu != old_cpu) {
- pd->llpd_count++;
- old_pd->llpd_count--;
- old_pd->llpd_gen++;
- llap->llap_pglist_cpu = pd->llpd_cpu;
- pd->llpd_cross++;
- }
- ll_pglist_double_unlock(sbi, old_cpu);
- }
- GOTO(out, llap);
- }
-
- exp = ll_i2dtexp(page->mapping->host);
- if (exp == NULL)
- RETURN(ERR_PTR(-EINVAL));
-
- /* limit the number of lustre-cached pages */
- cpu = get_cpu();
- pd = LL_PGLIST_DATA(sbi);
- target = pd->llpd_count - pd->llpd_budget;
- if (target > 0) {
- rc = 0;
- atomic_inc(&pd->llpd_sample_count);
- if (atomic_read(&pd->llpd_sample_count) >
- sbi->ll_async_page_sample_max) {
- pd->llpd_reblnc_count++;
- rc = llap_async_cache_rebalance(sbi);
- if (rc == 0)
- target = pd->llpd_count - pd->llpd_budget;
- }
- /* if rc equals 1, it means other cpu is doing the rebalance
- * job, and our budget # would be modified when we read it.
- * Furthermore, it is much likely being increased because
- * we have already reached the rebalance threshold. In this
- * case, we skip to shrink cache here. */
- if ((rc == 0) && target > 0)
- llap_shrink_cache_internal(sbi, cpu, target + 32);
- }
- put_cpu();
-
- OBD_SLAB_ALLOC(llap, ll_async_page_slab, CFS_ALLOC_STD,
- ll_async_page_slab_size);
- if (llap == NULL)
- RETURN(ERR_PTR(-ENOMEM));
- llap->llap_magic = LLAP_MAGIC;
- llap->llap_cookie = (void *)llap + size_round(sizeof(*llap));
-
- /* XXX: for bug 11270 - check for lockless origin here! */
- if (origin == LLAP_ORIGIN_LOCKLESS_IO)
- llap->llap_nocache = 1;
-
- rc = obd_prep_async_page(exp, ll_i2info(inode)->lli_smd, NULL, page,
- (obd_off)page->index << CFS_PAGE_SHIFT,
- &ll_async_page_ops, llap, &llap->llap_cookie,
- llap->llap_nocache, lockh);
- if (rc) {
- OBD_SLAB_FREE(llap, ll_async_page_slab,
- ll_async_page_slab_size);
- RETURN(ERR_PTR(rc));
- }
-
- CDEBUG(D_CACHE, "llap %p page %p cookie %p obj off "LPU64"\n", llap,
- page, llap->llap_cookie, (obd_off)page->index << CFS_PAGE_SHIFT);
- /* also zeroing the PRIVBITS low order bitflags */
- __set_page_ll_data(page, llap);
- llap->llap_page = page;
-
- lcounter_inc(&sbi->ll_async_page_count);
- pd = ll_pglist_lock(sbi);
- list_add_tail(&llap->llap_pglist_item, &pd->llpd_list);
- INIT_LIST_HEAD(&llap->llap_pending_write);
- pd->llpd_count++;
- pd->llpd_gen++;
- pd->llpd_miss++;
- llap->llap_pglist_cpu = pd->llpd_cpu;
- ll_pglist_unlock(sbi);
-
- out:
- if (unlikely(sbi->ll_flags & LL_SBI_CHECKSUM)) {
- __u32 csum;
- char *kaddr = kmap_atomic(page, KM_USER0);
- csum = init_checksum(OSC_DEFAULT_CKSUM);
- csum = compute_checksum(csum, kaddr, CFS_PAGE_SIZE,
- OSC_DEFAULT_CKSUM);
- kunmap_atomic(kaddr, KM_USER0);
- if (origin == LLAP_ORIGIN_READAHEAD ||
- origin == LLAP_ORIGIN_READPAGE ||
- origin == LLAP_ORIGIN_LOCKLESS_IO) {
- llap->llap_checksum = 0;
- } else if (origin == LLAP_ORIGIN_COMMIT_WRITE ||
- llap->llap_checksum == 0) {
- llap->llap_checksum = csum;
- CDEBUG(D_PAGE, "page %p cksum %x\n", page, csum);
- } else if (llap->llap_checksum == csum) {
- /* origin == LLAP_ORIGIN_WRITEPAGE */
- CDEBUG(D_PAGE, "page %p cksum %x confirmed\n",
- page, csum);
- } else {
- /* origin == LLAP_ORIGIN_WRITEPAGE */
- LL_CDEBUG_PAGE(D_ERROR, page, "old cksum %x != new "
- "%x!\n", llap->llap_checksum, csum);
+ result = cl_io_rw_init(env, io, CIT_WRITE, pos, from - to);
+ if (result == 0) {
+ cio->cui_fd = LUSTRE_FPRIVATE(file);
+ vio->cui_oneshot = 1;
+ result = cl_io_iter_init(env, io);
+ if (result == 0) {
+ result = cl_io_lock(env, io);
+ if (result == 0)
+ result = cl_io_start(env, io);
}
- }
-
- llap->llap_origin = origin;
- RETURN(llap);
+ } else
+ result = io->ci_result;
+ return result;
}
-struct ll_async_page *llap_from_page(struct page *page,
- unsigned origin)
-{
- return llap_from_page_with_lockh(page, origin, NULL);
-}
-
-static int queue_or_sync_write(struct obd_export *exp, struct inode *inode,
- struct ll_async_page *llap,
- unsigned to, obd_flag async_flags)
+/**
+ * ->prepare_write() address space operation called by generic_file_write()
+ * for every page during write.
+ */
+int ll_prepare_write(struct file *file, struct page *vmpage, unsigned from,
+ unsigned to)
{
- unsigned long size_index = i_size_read(inode) >> CFS_PAGE_SHIFT;
- struct obd_io_group *oig;
- struct ll_sb_info *sbi = ll_i2sbi(inode);
- int rc, noquot = llap->llap_ignore_quota ? OBD_BRW_NOQUOTA : 0;
+ struct lu_env *env;
+ struct cl_io *io;
+ struct cl_page *page;
+ int result;
+ int refcheck;
ENTRY;
- /* _make_ready only sees llap once we've unlocked the page */
- llap->llap_write_queued = 1;
- rc = obd_queue_async_io(exp, ll_i2info(inode)->lli_smd, NULL,
- llap->llap_cookie, OBD_BRW_WRITE | noquot,
- 0, 0, 0, async_flags);
- if (rc == 0) {
- LL_CDEBUG_PAGE(D_PAGE, llap->llap_page, "write queued\n");
- GOTO(out, 0);
- }
-
- llap->llap_write_queued = 0;
- /* Do not pass llap here as it is sync write. */
- llap_write_pending(inode, NULL);
-
- rc = oig_init(&oig);
- if (rc)
- GOTO(out, rc);
-
- /* make full-page requests if we are not at EOF (bug 4410) */
- if (to != CFS_PAGE_SIZE && llap->llap_page->index < size_index) {
- LL_CDEBUG_PAGE(D_PAGE, llap->llap_page,
- "sync write before EOF: size_index %lu, to %d\n",
- size_index, to);
- to = CFS_PAGE_SIZE;
- } else if (to != CFS_PAGE_SIZE && llap->llap_page->index == size_index){
- int size_to = i_size_read(inode) & ~CFS_PAGE_MASK;
- LL_CDEBUG_PAGE(D_PAGE, llap->llap_page,
- "sync write at EOF: size_index %lu, to %d/%d\n",
- size_index, to, size_to);
- if (to < size_to)
- to = size_to;
- }
-
- /* compare the checksum once before the page leaves llite */
- if (unlikely((sbi->ll_flags & LL_SBI_CHECKSUM) &&
- llap->llap_checksum != 0)) {
- __u32 csum;
- struct page *page = llap->llap_page;
- char *kaddr = kmap_atomic(page, KM_USER0);
- csum = init_checksum(OSC_DEFAULT_CKSUM);
- csum = compute_checksum(csum, kaddr, CFS_PAGE_SIZE,
- OSC_DEFAULT_CKSUM);
- kunmap_atomic(kaddr, KM_USER0);
- if (llap->llap_checksum == csum) {
- CDEBUG(D_PAGE, "page %p cksum %x confirmed\n",
- page, csum);
- } else {
- CERROR("page %p old cksum %x != new cksum %x!\n",
- page, llap->llap_checksum, csum);
+ result = ll_cl_init(file, vmpage, &env, &io, &page, &refcheck);
+ /*
+ * Loop-back driver calls ->prepare_write() and ->sendfile() methods
+ * directly, bypassing file system ->write() operation, so cl_io has
+ * to be created here.
+ */
+ if (result == -EALREADY) {
+ io = &ccc_env_info(env)->cti_io;
+ result = ll_prepare_loop(env, io, file, vmpage, from, to);
+ if (result == 0) {
+ result = ll_cl_init(file, vmpage,
+ &env, &io, &page, &refcheck);
+ cl_env_put(env, NULL);
}
}
-
- rc = obd_queue_group_io(exp, ll_i2info(inode)->lli_smd, NULL, oig,
- llap->llap_cookie, OBD_BRW_WRITE | noquot,
- 0, to, 0, ASYNC_READY | ASYNC_URGENT |
- ASYNC_COUNT_STABLE | ASYNC_GROUP_SYNC);
- if (rc)
- GOTO(free_oig, rc);
-
- rc = obd_trigger_group_io(exp, ll_i2info(inode)->lli_smd, NULL, oig);
- if (rc)
- GOTO(free_oig, rc);
-
- rc = oig_wait(oig);
-
- if (!rc && async_flags & ASYNC_READY) {
- unlock_page(llap->llap_page);
- if (PageWriteback(llap->llap_page))
- end_page_writeback(llap->llap_page);
- }
-
- if (rc == 0 && llap_write_complete(inode, llap))
- ll_queue_done_writing(inode, 0);
-
- LL_CDEBUG_PAGE(D_PAGE, llap->llap_page, "sync write returned %d\n", rc);
-
-free_oig:
- oig_release(oig);
-out:
- RETURN(rc);
+ if (result == 0) {
+ cl_page_assume(env, io, page);
+ result = cl_io_prepare_write(env, io, page, from, to);
+ if (result == 0) {
+ struct vvp_io *vio;
+
+ /*
+ * Add a reference, so that page is not evicted from
+ * the cache until ->commit_write() is called.
+ */
+ cl_page_get(page);
+ lu_ref_add(&page->cp_reference, "prepare_write",
+ cfs_current());
+ vio = vvp_env_io(env);
+ if (vio->cui_oneshot > 0)
+ vio->cui_oneshot++;
+ } else
+ cl_page_unassume(env, io, page);
+ }
+ ll_cl_fini(env, io, page, &refcheck);
+ RETURN(result);
}
-/* update our write count to account for i_size increases that may have
- * happened since we've queued the page for io. */
-
-/* be careful not to return success without setting the page Uptodate or
- * the next pass through prepare_write will read in stale data from disk. */
-int ll_commit_write(struct file *file, struct page *page, unsigned from,
+int ll_commit_write(struct file *file, struct page *vmpage, unsigned from,
unsigned to)
{
- struct ll_file_data *fd = LUSTRE_FPRIVATE(file);
- struct inode *inode = page->mapping->host;
- struct ll_inode_info *lli = ll_i2info(inode);
- struct lov_stripe_md *lsm = lli->lli_smd;
- struct obd_export *exp;
- struct ll_async_page *llap;
- loff_t size;
- struct lustre_handle *lockh = NULL;
- int rc = 0;
+ struct lu_env *env;
+ struct cl_io *io;
+ struct cl_page *page;
+ int result;
+ int refcheck;
ENTRY;
- SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */
- LASSERT(inode == file->f_dentry->d_inode);
- LASSERT(PageLocked(page));
-
- CDEBUG(D_INODE, "inode %p is writing page %p from %d to %d at %lu\n",
- inode, page, from, to, page->index);
-
- if (fd->fd_flags & LL_FILE_GROUP_LOCKED)
- lockh = &fd->fd_cwlockh;
-
- llap = llap_from_page_with_lockh(page, LLAP_ORIGIN_COMMIT_WRITE, lockh);
- if (IS_ERR(llap))
- RETURN(PTR_ERR(llap));
-
- exp = ll_i2dtexp(inode);
- if (exp == NULL)
- RETURN(-EINVAL);
-
- llap->llap_ignore_quota = cfs_capable(CFS_CAP_SYS_RESOURCE);
-
- /*
- * queue a write for some time in the future the first time we
- * dirty the page.
- *
- * This is different from what other file systems do: they usually
- * just mark page (and some of its buffers) dirty and rely on
- * balance_dirty_pages() to start a write-back. Lustre wants write-back
- * to be started earlier for the following reasons:
- *
- * (1) with a large number of clients we need to limit the amount
- * of cached data on the clients a lot;
- *
- * (2) large compute jobs generally want compute-only then io-only
- * and the IO should complete as quickly as possible;
- *
- * (3) IO is batched up to the RPC size and is async until the
- * client max cache is hit
- * (/proc/fs/lustre/osc/OSC.../max_dirty_mb)
- *
- */
- if (!PageDirty(page)) {
- ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRTY_MISSES, 1);
-
- rc = queue_or_sync_write(exp, inode, llap, to, 0);
- if (rc)
- GOTO(out, rc);
- } else {
- ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRTY_HITS, 1);
+ result = ll_cl_init(file, vmpage, &env, &io, &page, &refcheck);
+ LASSERT(result != -EALREADY);
+ if (result == 0) {
+ LASSERT(cl_page_is_owned(page, io));
+ result = cl_io_commit_write(env, io, page, from, to);
+ if (cl_page_is_owned(page, io))
+ cl_page_unassume(env, io, page);
+ /*
+ * Release reference acquired by cl_io_prepare_write().
+ */
+ lu_ref_del(&page->cp_reference, "prepare_write", cfs_current());
+ cl_page_put(env, page);
}
+ ll_cl_fini(env, io, page, &refcheck);
+ RETURN(result);
+}
- /* put the page in the page cache, from now on ll_removepage is
- * responsible for cleaning up the llap.
- * only set page dirty when it's queued to be write out */
- if (llap->llap_write_queued)
- set_page_dirty(page);
+struct obd_capa *cl_capa_lookup(struct inode *inode, enum cl_req_type crt)
+{
+ __u64 opc;
-out:
- size = (((obd_off)page->index) << CFS_PAGE_SHIFT) + to;
- ll_inode_size_lock(inode, 0);
- if (rc == 0) {
- lov_stripe_lock(lsm);
- obd_adjust_kms(exp, lsm, size, 0);
- lov_stripe_unlock(lsm);
- if (size > i_size_read(inode))
- i_size_write(inode, size);
- SetPageUptodate(page);
- } else if (size > i_size_read(inode)) {
- /* this page beyond the pales of i_size, so it can't be
- * truncated in ll_p_r_e during lock revoking. we must
- * teardown our book-keeping here. */
- ll_removepage(page);
- }
- ll_inode_size_unlock(inode, 0);
- RETURN(rc);
+ opc = crt == CRT_WRITE ? CAPA_OPC_OSS_WRITE : CAPA_OPC_OSS_RW;
+ return ll_osscapa_get(inode, opc);
}
static void ll_ra_stats_inc_sbi(struct ll_sb_info *sbi, enum ra_stat which);
-/* WARNING: This algorithm is used to reduce the contention on
- * sbi->ll_lock. It should work well if the ra_max_pages is much
+/* WARNING: This algorithm is used to reduce the contention on
+ * sbi->ll_lock. It should work well if the ra_max_pages is much
* greater than the single file's read-ahead window.
*
- * TODO: There may exist a `global sync problem' in this implementation.
+ * TODO: There may exist a `global sync problem' in this implementation.
* Considering the global ra window is 100M, and each file's ra window is 10M,
- * there are over 10 files trying to get its ra budget and reach
+ * there are over 10 files trying to get its ra budget and reach
* ll_ra_count_get at the exactly same time. All of them will get a zero ra
* window, although the global window is 100M. -jay
*/
RETURN(ret);
}
-static void ll_ra_count_put(struct ll_sb_info *sbi, unsigned long len)
+void ll_ra_count_put(struct ll_sb_info *sbi, unsigned long len)
{
struct ll_ra_info *ra = &sbi->ll_ra_info;
atomic_sub(len, &ra->ra_cur_pages);
}
-/* called for each page in a completed rpc.*/
-int ll_ap_completion(void *data, int cmd, struct obdo *oa, int rc)
-{
- struct ll_async_page *llap;
- struct page *page;
- int ret = 0;
- ENTRY;
-
- llap = llap_from_cookie(data);
- page = llap->llap_page;
- LASSERT(PageLocked(page));
- LASSERT(CheckWriteback(page,cmd));
-
- LL_CDEBUG_PAGE(D_PAGE, page, "completing cmd %d with %d\n", cmd, rc);
-
- if (cmd & OBD_BRW_READ && llap->llap_defer_uptodate)
- ll_ra_count_put(ll_i2sbi(page->mapping->host), 1);
-
- if (rc == 0) {
- if (cmd & OBD_BRW_READ) {
- if (!llap->llap_defer_uptodate)
- SetPageUptodate(page);
- } else {
- llap->llap_write_queued = 0;
- }
- ClearPageError(page);
- } else {
- if (cmd & OBD_BRW_READ) {
- llap->llap_defer_uptodate = 0;
- }
- SetPageError(page);
- if (rc == -ENOSPC)
- set_bit(AS_ENOSPC, &page->mapping->flags);
- else
- set_bit(AS_EIO, &page->mapping->flags);
- }
-
- /* be carefull about clear WB.
- * if WB will cleared after page lock is released - paralel IO can be
- * started before ap_make_ready is finished - so we will be have page
- * with PG_Writeback set from ->writepage() and completed READ which
- * clear this flag */
- if ((cmd & OBD_BRW_WRITE) && PageWriteback(page))
- end_page_writeback(page);
-
- unlock_page(page);
-
- if (cmd & OBD_BRW_WRITE) {
- /* Only rc == 0, write succeed, then this page could be deleted
- * from the pending_writing list
- */
- if (rc == 0 && llap_write_complete(page->mapping->host, llap))
- ll_queue_done_writing(page->mapping->host, 0);
- }
-
- page_cache_release(page);
-
- RETURN(ret);
-}
-
-static void __ll_put_llap(struct page *page)
-{
- struct inode *inode = page->mapping->host;
- struct obd_export *exp;
- struct ll_async_page *llap;
- struct ll_sb_info *sbi = ll_i2sbi(inode);
- struct ll_pglist_data *pd;
- int rc, cpu;
- ENTRY;
-
- exp = ll_i2dtexp(inode);
- if (exp == NULL) {
- CERROR("page %p ind %lu gave null export\n", page, page->index);
- EXIT;
- return;
- }
-
- llap = llap_from_page(page, LLAP_ORIGIN_REMOVEPAGE);
- if (IS_ERR(llap)) {
- CERROR("page %p ind %lu couldn't find llap: %ld\n", page,
- page->index, PTR_ERR(llap));
- EXIT;
- return;
- }
-
- if (llap_write_complete(inode, llap))
- ll_queue_done_writing(inode, 0);
-
- rc = obd_teardown_async_page(exp, ll_i2info(inode)->lli_smd, NULL,
- llap->llap_cookie);
- if (rc != 0)
- CERROR("page %p ind %lu failed: %d\n", page, page->index, rc);
-
- /* this unconditional free is only safe because the page lock
- * is providing exclusivity to memory pressure/truncate/writeback..*/
- __clear_page_ll_data(page);
-
- lcounter_dec(&sbi->ll_async_page_count);
- cpu = llap->llap_pglist_cpu;
- pd = ll_pglist_cpu_lock(sbi, cpu);
- pd->llpd_gen++;
- pd->llpd_count--;
- if (!list_empty(&llap->llap_pglist_item))
- list_del_init(&llap->llap_pglist_item);
- ll_pglist_cpu_unlock(sbi, cpu);
- OBD_SLAB_FREE(llap, ll_async_page_slab, ll_async_page_slab_size);
- EXIT;
-}
-
-/* the kernel calls us here when a page is unhashed from the page cache.
- * the page will be locked and the kernel is holding a spinlock, so
- * we need to be careful. we're just tearing down our book-keeping
- * here. */
-void ll_removepage(struct page *page)
-{
- struct ll_async_page *llap = llap_cast_private(page);
- ENTRY;
-
- LASSERT(!in_interrupt());
-
- /* sync pages or failed read pages can leave pages in the page
- * cache that don't have our data associated with them anymore */
- if (page_private(page) == 0) {
- EXIT;
- return;
- }
-
- LASSERT(!llap->llap_lockless_io_page);
- LASSERT(!llap->llap_nocache);
- LL_CDEBUG_PAGE(D_PAGE, page, "being evicted\n");
- __ll_put_llap(page);
- EXIT;
-}
-
-static int ll_issue_page_read(struct obd_export *exp,
- struct ll_async_page *llap,
- struct obd_io_group *oig, int defer)
-{
- struct page *page = llap->llap_page;
- int rc;
-
- page_cache_get(page);
- llap->llap_defer_uptodate = defer;
- llap->llap_ra_used = 0;
- rc = obd_queue_group_io(exp, ll_i2info(page->mapping->host)->lli_smd,
- NULL, oig, llap->llap_cookie, OBD_BRW_READ, 0,
- CFS_PAGE_SIZE, 0, ASYNC_COUNT_STABLE |
- ASYNC_READY | ASYNC_URGENT);
- if (rc) {
- LL_CDEBUG_PAGE(D_ERROR, page, "read queue failed: rc %d\n", rc);
- page_cache_release(page);
- }
- RETURN(rc);
-}
-
static void ll_ra_stats_inc_sbi(struct ll_sb_info *sbi, enum ra_stat which)
{
LASSERTF(which >= 0 && which < _NR_RA_STAT, "which: %u\n", which);
lprocfs_counter_incr(sbi->ll_ra_stats, which);
}
-static void ll_ra_stats_inc(struct address_space *mapping, enum ra_stat which)
+void ll_ra_stats_inc(struct address_space *mapping, enum ra_stat which)
{
struct ll_sb_info *sbi = ll_i2sbi(mapping->host);
ll_ra_stats_inc_sbi(sbi, which);
}
-void ll_ra_accounting(struct ll_async_page *llap, struct address_space *mapping)
-{
- if (!llap->llap_defer_uptodate || llap->llap_ra_used)
- return;
-
- ll_ra_stats_inc(mapping, RA_STAT_DISCARDED);
-}
-
#define RAS_CDEBUG(ras) \
CDEBUG(D_READA, \
"lrp %lu cr %lu cp %lu ws %lu wl %lu nra %lu r %lu ri %lu" \
return bead;
}
-static int ll_read_ahead_page(struct obd_export *exp, struct obd_io_group *oig,
+static int cl_read_ahead_page(const struct lu_env *env, struct cl_io *io,
+ struct cl_page_list *queue, struct cl_page *page,
+ struct page *vmpage)
+{
+ struct ccc_page *cp;
+ int rc;
+
+ ENTRY;
+
+ rc = 0;
+ cl_page_assume(env, io, page);
+ lu_ref_add(&page->cp_reference, "ra", cfs_current());
+ cp = cl2ccc_page(cl_page_at(page, &vvp_device_type));
+ if (!cp->cpg_defer_uptodate && !Page_Uptodate(vmpage)) {
+ rc = cl_page_is_under_lock(env, io, page);
+ if (rc == -EBUSY) {
+ cp->cpg_defer_uptodate = 1;
+ cp->cpg_ra_used = 0;
+ cl_page_list_add(queue, page);
+ rc = 1;
+ } else {
+ cl_page_delete(env, page);
+ rc = -ENOLCK;
+ }
+ } else
+ /* skip completed pages */
+ cl_page_unassume(env, io, page);
+ lu_ref_del(&page->cp_reference, "ra", cfs_current());
+ cl_page_put(env, page);
+ RETURN(rc);
+}
+
+/**
+ * Initiates read-ahead of a page with given index.
+ *
+ * \retval +ve: page was added to \a queue.
+ *
+ * \retval -ENOLCK: there is no extent lock for this part of a file, stop
+ * read-ahead.
+ *
+ * \retval -ve, 0: page wasn't added to \a queue for other reason.
+ */
+static int ll_read_ahead_page(const struct lu_env *env, struct cl_io *io,
+ struct cl_page_list *queue,
int index, struct address_space *mapping)
{
- struct ll_async_page *llap;
- struct page *page;
- unsigned int gfp_mask = 0;
- int rc = 0;
+ struct page *vmpage;
+ struct cl_object *clob = ll_i2info(mapping->host)->lli_clob;
+ struct cl_page *page;
+ enum ra_stat which = _NR_RA_STAT; /* keep gcc happy */
+ unsigned int gfp_mask;
+ int rc = 0;
+ const char *msg = NULL;
+
+ ENTRY;
gfp_mask = GFP_HIGHUSER & ~__GFP_WAIT;
#ifdef __GFP_NOWARN
gfp_mask |= __GFP_NOWARN;
#endif
- page = grab_cache_page_nowait_gfp(mapping, index, gfp_mask);
- if (page == NULL) {
- ll_ra_stats_inc(mapping, RA_STAT_FAILED_GRAB_PAGE);
- CDEBUG(D_READA, "g_c_p_n failed\n");
- return 0;
- }
-
- /* Check if page was truncated or reclaimed */
- if (page->mapping != mapping) {
- ll_ra_stats_inc(mapping, RA_STAT_WRONG_GRAB_PAGE);
- CDEBUG(D_READA, "g_c_p_n returned invalid page\n");
- GOTO(unlock_page, rc = 0);
- }
-
- /* we do this first so that we can see the page in the /proc
- * accounting */
- llap = llap_from_page(page, LLAP_ORIGIN_READAHEAD);
- if (IS_ERR(llap) || llap->llap_defer_uptodate) {
- if (PTR_ERR(llap) == -ENOLCK) {
- ll_ra_stats_inc(mapping, RA_STAT_FAILED_MATCH);
- CDEBUG(D_READA | D_PAGE,
- "Adding page to cache failed index "
- "%d\n", index);
- CDEBUG(D_READA, "nolock page\n");
- GOTO(unlock_page, rc = -ENOLCK);
+ vmpage = grab_cache_page_nowait_gfp(mapping, index, gfp_mask);
+ if (vmpage != NULL) {
+ /* Check if vmpage was truncated or reclaimed */
+ if (vmpage->mapping == mapping) {
+ page = cl_page_find(env, clob, vmpage->index,
+ vmpage, CPT_CACHEABLE);
+ if (!IS_ERR(page)) {
+ rc = cl_read_ahead_page(env, io, queue,
+ page, vmpage);
+ if (rc == -ENOLCK) {
+ which = RA_STAT_FAILED_MATCH;
+ msg = "lock match failed";
+ }
+ } else {
+ which = RA_STAT_FAILED_GRAB_PAGE;
+ msg = "cl_page_find failed";
+ }
+ } else {
+ which = RA_STAT_WRONG_GRAB_PAGE;
+ msg = "g_c_p_n returned invalid page";
}
- CDEBUG(D_READA, "read-ahead page\n");
- GOTO(unlock_page, rc = 0);
- }
-
- /* skip completed pages */
- if (Page_Uptodate(page))
- GOTO(unlock_page, rc = 0);
-
- /* bail out when we hit the end of the lock. */
- rc = ll_issue_page_read(exp, llap, oig, 1);
- if (rc == 0) {
- LL_CDEBUG_PAGE(D_READA | D_PAGE, page, "started read-ahead\n");
- rc = 1;
+ if (rc != 1)
+ unlock_page(vmpage);
+ page_cache_release(vmpage);
} else {
-unlock_page:
- unlock_page(page);
- LL_CDEBUG_PAGE(D_READA | D_PAGE, page, "skipping read-ahead\n");
+ which = RA_STAT_FAILED_GRAB_PAGE;
+ msg = "g_c_p_n failed";
+ }
+ if (msg != NULL) {
+ ll_ra_stats_inc(mapping, which);
+ CDEBUG(D_READA, "%s\n", msg);
}
- page_cache_release(page);
- return rc;
+ RETURN(rc);
}
-/* ra_io_arg will be filled in the beginning of ll_readahead with
- * ras_lock, then the following ll_read_ahead_pages will read RA
- * pages according to this arg, all the items in this structure are
- * counted by page index.
- */
-struct ra_io_arg {
- unsigned long ria_start; /* start offset of read-ahead*/
- unsigned long ria_end; /* end offset of read-ahead*/
- /* If stride read pattern is detected, ria_stoff means where
- * stride read is started. Note: for normal read-ahead, the
- * value here is meaningless, and also it will not be accessed*/
- pgoff_t ria_stoff;
- /* ria_length and ria_pages are the length and pages length in the
- * stride I/O mode. And they will also be used to check whether
- * it is stride I/O read-ahead in the read-ahead pages*/
- unsigned long ria_length;
- unsigned long ria_pages;
-};
-
-#define RIA_DEBUG(ria) \
+#define RIA_DEBUG(ria) \
CDEBUG(D_READA, "rs %lu re %lu ro %lu rl %lu rp %lu\n", \
ria->ria_start, ria->ria_end, ria->ria_stoff, ria->ria_length,\
ria->ria_pages)
(idx - ria->ria_stoff) % ria->ria_length < ria->ria_pages;
}
-static int ll_read_ahead_pages(struct obd_export *exp,
- struct obd_io_group *oig,
- struct ra_io_arg *ria,
+static int ll_read_ahead_pages(const struct lu_env *env,
+ struct cl_io *io, struct cl_page_list *queue,
+ struct ra_io_arg *ria,
unsigned long *reserved_pages,
struct address_space *mapping,
unsigned long *ra_end)
*reserved_pages > 0; page_idx++) {
if (ras_inside_ra_window(page_idx, ria)) {
/* If the page is inside the read-ahead window*/
- rc = ll_read_ahead_page(exp, oig, page_idx, mapping);
- if (rc == 1) {
- (*reserved_pages)--;
- count ++;
- } else if (rc == -ENOLCK)
- break;
+ rc = ll_read_ahead_page(env, io, queue,
+ page_idx, mapping);
+ if (rc == 1) {
+ (*reserved_pages)--;
+ count ++;
+ } else if (rc == -ENOLCK)
+ break;
} else if (stride_ria) {
/* If it is not in the read-ahead window, and it is
* read-ahead mode, then check whether it should skip
* the stride gap */
- pgoff_t offset;
+ pgoff_t offset;
/* FIXME: This assertion only is valid when it is for
* forward read-ahead, it will be fixed when backward
* read-ahead is implemented */
" offset %lu \n", page_idx, ria->ria_stoff);
offset = page_idx - ria->ria_stoff;
- offset = offset % (ria->ria_length);
- if (offset > ria->ria_pages) {
- page_idx += ria->ria_length - offset;
+ offset = offset % (ria->ria_length);
+ if (offset > ria->ria_pages) {
+ page_idx += ria->ria_length - offset;
CDEBUG(D_READA, "i %lu skip %lu \n", page_idx,
ria->ria_length - offset);
continue;
return count;
}
-static int ll_readahead(struct ll_readahead_state *ras,
- struct obd_export *exp, struct address_space *mapping,
- struct obd_io_group *oig, int flags)
+int ll_readahead(const struct lu_env *env, struct cl_io *io,
+ struct ll_readahead_state *ras, struct address_space *mapping,
+ struct cl_page_list *queue, int flags)
{
+ struct vvp_io *vio = vvp_env_io(env);
+ struct vvp_thread_info *vti = vvp_env_info(env);
+ struct ccc_thread_info *cti = ccc_env_info(env);
unsigned long start = 0, end = 0, reserved;
unsigned long ra_end, len;
struct inode *inode;
- struct lov_stripe_md *lsm;
struct ll_ra_read *bead;
- struct ost_lvb lvb;
- struct ra_io_arg ria = { 0 };
+ struct ra_io_arg *ria = &vti->vti_ria;
+ struct ll_inode_info *lli;
+ struct cl_object *clob;
+ struct cl_attr *attr = &cti->cti_attr;
int ret = 0;
__u64 kms;
ENTRY;
inode = mapping->host;
- lsm = ll_i2info(inode)->lli_smd;
+ lli = ll_i2info(inode);
+ clob = lli->lli_clob;
+
+ memset(ria, 0, sizeof *ria);
+
+ cl_object_attr_lock(clob);
+ ret = cl_object_attr_get(env, clob, attr);
+ cl_object_attr_unlock(clob);
- lov_stripe_lock(lsm);
- inode_init_lvb(inode, &lvb);
- obd_merge_lvb(ll_i2dtexp(inode), lsm, &lvb, 1);
- kms = lvb.lvb_size;
- lov_stripe_unlock(lsm);
+ if (ret != 0)
+ RETURN(ret);
+ kms = attr->cat_kms;
if (kms == 0) {
ll_ra_stats_inc(mapping, RA_STAT_ZERO_LEN);
RETURN(0);
}
spin_lock(&ras->ras_lock);
- bead = ll_ra_read_get_locked(ras);
+ if (vio->cui_ra_window_set)
+ bead = &vio->cui_bead;
+ else
+ bead = NULL;
+
/* Enlarge the RA window to encompass the full read */
if (bead != NULL && ras->ras_window_start + ras->ras_window_len <
bead->lrr_start + bead->lrr_count) {
ras->ras_window_len = bead->lrr_start + bead->lrr_count -
ras->ras_window_start;
}
- /* Reserve a part of the read-ahead window that we'll be issuing */
+ /* Reserve a part of the read-ahead window that we'll be issuing */
if (ras->ras_window_len) {
start = ras->ras_next_readahead;
end = ras->ras_window_start + ras->ras_window_len - 1;
ras->ras_next_readahead = max(end, end + 1);
RAS_CDEBUG(ras);
}
- ria.ria_start = start;
- ria.ria_end = end;
+ ria->ria_start = start;
+ ria->ria_end = end;
/* If stride I/O mode is detected, get stride window*/
if (stride_io_mode(ras)) {
- ria.ria_stoff = ras->ras_stride_offset;
- ria.ria_length = ras->ras_stride_length;
- ria.ria_pages = ras->ras_stride_pages;
+ ria->ria_stoff = ras->ras_stride_offset;
+ ria->ria_length = ras->ras_stride_length;
+ ria->ria_pages = ras->ras_stride_pages;
}
spin_unlock(&ras->ras_lock);
ll_ra_stats_inc(mapping, RA_STAT_ZERO_WINDOW);
RETURN(0);
}
- len = ria_page_count(&ria);
+ len = ria_page_count(ria);
if (len == 0)
RETURN(0);
ll_ra_stats_inc(mapping, RA_STAT_MAX_IN_FLIGHT);
CDEBUG(D_READA, "reserved page %lu \n", reserved);
-
- ret = ll_read_ahead_pages(exp, oig, &ria, &reserved, mapping, &ra_end);
+
+ ret = ll_read_ahead_pages(env, io, queue,
+ ria, &reserved, mapping, &ra_end);
LASSERTF(reserved >= 0, "reserved %lu\n", reserved);
if (reserved != 0)
* if the region we failed to issue read-ahead on is still ahead
* of the app and behind the next index to start read-ahead from */
CDEBUG(D_READA, "ra_end %lu end %lu stride end %lu \n",
- ra_end, end, ria.ria_end);
+ ra_end, end, ria->ria_end);
- if (ra_end != (end + 1)) {
+ if (ra_end != end + 1) {
spin_lock(&ras->ras_lock);
if (ra_end < ras->ras_next_readahead &&
index_in_window(ra_end, ras->ras_window_start, 0,
ras->ras_window_len)) {
- ras->ras_next_readahead = ra_end;
- RAS_CDEBUG(ras);
+ ras->ras_next_readahead = ra_end;
+ RAS_CDEBUG(ras);
}
spin_unlock(&ras->ras_lock);
}
INIT_LIST_HEAD(&ras->ras_read_beads);
}
-/*
+/*
* Check whether the read request is in the stride window.
* If it is in the stride window, return 1, otherwise return 0.
*/
struct inode *inode)
{
unsigned long stride_gap = index - ras->ras_last_readpage - 1;
-
+
if (ras->ras_stride_length == 0 || ras->ras_stride_pages == 0)
return 0;
/* Otherwise check the stride by itself */
return (ras->ras_stride_length - ras->ras_stride_pages) == stride_gap &&
- ras->ras_consecutive_pages == ras->ras_stride_pages;
+ ras->ras_consecutive_pages == ras->ras_stride_pages;
}
static void ras_update_stride_detector(struct ll_readahead_state *ras,
{
unsigned long stride_gap = index - ras->ras_last_readpage - 1;
- if (!stride_io_mode(ras) && (stride_gap != 0 ||
+ if (!stride_io_mode(ras) && (stride_gap != 0 ||
ras->ras_consecutive_stride_requests == 0)) {
ras->ras_stride_pages = ras->ras_consecutive_pages;
ras->ras_stride_length = stride_gap +ras->ras_consecutive_pages;
RAS_CDEBUG(ras);
}
-static void ras_update(struct ll_sb_info *sbi, struct inode *inode,
- struct ll_readahead_state *ras, unsigned long index,
- unsigned hit)
+void ras_update(struct ll_sb_info *sbi, struct inode *inode,
+ struct ll_readahead_state *ras, unsigned long index,
+ unsigned hit)
{
struct ll_ra_info *ra = &sbi->ll_ra_info;
int zero = 0, stride_detect = 0, ra_miss = 0;
ENTRY;
+ spin_lock(&sbi->ll_lock);
spin_lock(&ras->ras_lock);
ll_ra_stats_inc_sbi(sbi, hit ? RA_STAT_HIT : RA_STAT_MISS);
if (ra_miss) {
if (index_in_stride_window(index, ras, inode) &&
stride_io_mode(ras)) {
- /*If stride-RA hit cache miss, the stride dector
+ /*If stride-RA hit cache miss, the stride dector
*will not be reset to avoid the overhead of
*redetecting read-ahead mode */
if (index != ras->ras_last_readpage + 1)
ras->ras_consecutive_pages = 0;
RAS_CDEBUG(ras);
} else {
- /* Reset both stride window and normal RA window */
+ /* Reset both stride window and normal RA window */
ras_reset(ras, index);
ras->ras_consecutive_pages++;
ras_stride_reset(ras);
RAS_CDEBUG(ras);
ras->ras_request_index++;
spin_unlock(&ras->ras_lock);
+ spin_unlock(&sbi->ll_lock);
return;
}
-int ll_writepage(struct page *page)
-{
- struct inode *inode = page->mapping->host;
- struct ll_inode_info *lli = ll_i2info(inode);
- struct obd_export *exp;
- struct ll_async_page *llap;
- int rc = 0;
- ENTRY;
-
- LASSERT(PageLocked(page));
-
- exp = ll_i2dtexp(inode);
- if (exp == NULL)
- GOTO(out, rc = -EINVAL);
-
- llap = llap_from_page(page, LLAP_ORIGIN_WRITEPAGE);
- if (IS_ERR(llap))
- GOTO(out, rc = PTR_ERR(llap));
-
- LASSERT(!llap->llap_nocache);
- LASSERT(!PageWriteback(page));
- set_page_writeback(page);
-
- page_cache_get(page);
- if (llap->llap_write_queued) {
- LL_CDEBUG_PAGE(D_PAGE, page, "marking urgent\n");
- rc = obd_set_async_flags(exp, lli->lli_smd, NULL,
- llap->llap_cookie,
- ASYNC_READY | ASYNC_URGENT);
- } else {
- rc = queue_or_sync_write(exp, inode, llap, CFS_PAGE_SIZE,
- ASYNC_READY | ASYNC_URGENT);
- }
- if (rc) {
- /* re-dirty page on error so it retries write */
- if (PageWriteback(page))
- end_page_writeback(page);
-
- /* resend page only for not started IO*/
- if (!PageError(page))
- ll_redirty_page(page);
-
- page_cache_release(page);
- }
-out:
- if (rc) {
- if (!lli->lli_async_rc)
- lli->lli_async_rc = rc;
- /* resend page only for not started IO*/
- unlock_page(page);
- }
- RETURN(rc);
-}
-
-/*
- * for now we do our readpage the same on both 2.4 and 2.5. The kernel's
- * read-ahead assumes it is valid to issue readpage all the way up to
- * i_size, but our dlm locks make that not the case. We disable the
- * kernel's read-ahead and do our own by walking ahead in the page cache
- * checking for dlm lock coverage. the main difference between 2.4 and
- * 2.6 is how read-ahead gets batched and issued, but we're using our own,
- * so they look the same.
- */
-int ll_readpage(struct file *filp, struct page *page)
+int ll_writepage(struct page *vmpage, struct writeback_control *_)
{
- struct ll_file_data *fd = LUSTRE_FPRIVATE(filp);
- struct inode *inode = page->mapping->host;
- struct obd_export *exp;
- struct ll_async_page *llap;
- struct obd_io_group *oig = NULL;
- struct lustre_handle *lockh = NULL;
- int rc;
+ struct inode *inode = vmpage->mapping->host;
+ struct lu_env *env;
+ struct cl_io *io;
+ struct cl_page *page;
+ struct cl_object *clob;
+ struct cl_2queue *queue;
+ struct cl_env_nest nest;
+ int result;
ENTRY;
- LASSERT(PageLocked(page));
- LASSERT(!PageUptodate(page));
- CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p),offset=%Lu=%#Lx\n",
- inode->i_ino, inode->i_generation, inode,
- (((loff_t)page->index) << CFS_PAGE_SHIFT),
- (((loff_t)page->index) << CFS_PAGE_SHIFT));
- LASSERT(atomic_read(&filp->f_dentry->d_inode->i_count) > 0);
-
- if (!ll_i2info(inode)->lli_smd) {
- /* File with no objects - one big hole */
- /* We use this just for remove_from_page_cache that is not
- * exported, we'd make page back up to date. */
- ll_truncate_complete_page(page);
- clear_page(kmap(page));
- kunmap(page);
- SetPageUptodate(page);
- unlock_page(page);
- RETURN(0);
- }
-
- rc = oig_init(&oig);
- if (rc < 0)
- GOTO(out, rc);
-
- exp = ll_i2dtexp(inode);
- if (exp == NULL)
- GOTO(out, rc = -EINVAL);
+ LASSERT(PageLocked(vmpage));
+ LASSERT(!PageWriteback(vmpage));
- if (fd->fd_flags & LL_FILE_GROUP_LOCKED)
- lockh = &fd->fd_cwlockh;
-
- llap = llap_from_page_with_lockh(page, LLAP_ORIGIN_READPAGE, lockh);
- if (IS_ERR(llap)) {
- if (PTR_ERR(llap) == -ENOLCK) {
- CWARN("ino %lu page %lu (%llu) not covered by "
- "a lock (mmap?). check debug logs.\n",
- inode->i_ino, page->index,
- (long long)page->index << PAGE_CACHE_SHIFT);
- }
- GOTO(out, rc = PTR_ERR(llap));
- }
-
- if (ll_i2sbi(inode)->ll_ra_info.ra_max_pages)
- ras_update(ll_i2sbi(inode), inode, &fd->fd_ras, page->index,
- llap->llap_defer_uptodate);
-
-
- if (llap->llap_defer_uptodate) {
- /* This is the callpath if we got the page from a readahead */
- llap->llap_ra_used = 1;
- rc = ll_readahead(&fd->fd_ras, exp, page->mapping, oig,
- fd->fd_flags);
- if (rc > 0)
- obd_trigger_group_io(exp, ll_i2info(inode)->lli_smd,
- NULL, oig);
- LL_CDEBUG_PAGE(D_PAGE, page, "marking uptodate from defer\n");
- SetPageUptodate(page);
- unlock_page(page);
- GOTO(out_oig, rc = 0);
- }
-
- rc = ll_issue_page_read(exp, llap, oig, 0);
- if (rc)
- GOTO(out, rc);
-
- LL_CDEBUG_PAGE(D_PAGE, page, "queued readpage\n");
- /* We have just requested the actual page we want, see if we can tack
- * on some readahead to that page's RPC before it is sent. */
- if (ll_i2sbi(inode)->ll_ra_info.ra_max_pages)
- ll_readahead(&fd->fd_ras, exp, page->mapping, oig,
- fd->fd_flags);
-
- rc = obd_trigger_group_io(exp, ll_i2info(inode)->lli_smd, NULL, oig);
-
-out:
- if (rc)
- unlock_page(page);
-out_oig:
- if (oig != NULL)
- oig_release(oig);
- RETURN(rc);
-}
-
-static void ll_file_put_pages(struct page **pages, int numpages)
-{
- int i;
- struct page **pp;
- ENTRY;
-
- for (i = 0, pp = pages; i < numpages; i++, pp++) {
- if (*pp) {
- LL_CDEBUG_PAGE(D_PAGE, (*pp), "free\n");
- __ll_put_llap(*pp);
- if (page_private(*pp))
- CERROR("the llap wasn't freed\n");
- (*pp)->mapping = NULL;
- if (page_count(*pp) != 1)
- CERROR("page %p, flags %#lx, count %i, private %p\n",
- (*pp), (unsigned long)(*pp)->flags, page_count(*pp),
- (void*)page_private(*pp));
- __free_pages(*pp, 0);
- }
- }
- OBD_FREE(pages, numpages * sizeof(struct page*));
- EXIT;
-}
-
-static struct page **ll_file_prepare_pages(int numpages, struct inode *inode,
- unsigned long first)
-{
- struct page **pages;
- int i;
- int rc = 0;
- ENTRY;
-
- OBD_ALLOC(pages, sizeof(struct page *) * numpages);
- if (pages == NULL)
- RETURN(ERR_PTR(-ENOMEM));
- for (i = 0; i < numpages; i++) {
- struct page *page;
- struct ll_async_page *llap;
-
- page = alloc_pages(GFP_HIGHUSER, 0);
- if (page == NULL)
- GOTO(err, rc = -ENOMEM);
- pages[i] = page;
- /* llap_from_page needs page index and mapping to be set */
- page->index = first++;
- page->mapping = inode->i_mapping;
- llap = llap_from_page(page, LLAP_ORIGIN_LOCKLESS_IO);
- if (IS_ERR(llap))
- GOTO(err, rc = PTR_ERR(llap));
- llap->llap_lockless_io_page = 1;
- }
- RETURN(pages);
-err:
- ll_file_put_pages(pages, numpages);
- RETURN(ERR_PTR(rc));
- }
-
-static ssize_t ll_file_copy_pages(struct page **pages, int numpages,
- char *buf, loff_t pos, size_t count, int rw)
-{
- ssize_t amount = 0;
- int i;
- int updatechecksum = ll_i2sbi(pages[0]->mapping->host)->ll_flags &
- LL_SBI_CHECKSUM;
- ENTRY;
+ if (ll_i2dtexp(inode) == NULL)
+ RETURN(-EINVAL);
- for (i = 0; i < numpages; i++) {
- unsigned offset, bytes, left;
- char *vaddr;
-
- vaddr = kmap(pages[i]);
- offset = pos & (CFS_PAGE_SIZE - 1);
- bytes = min_t(unsigned, CFS_PAGE_SIZE - offset, count);
- LL_CDEBUG_PAGE(D_PAGE, pages[i], "op = %s, addr = %p, "
- "buf = %p, bytes = %u\n",
- (rw == WRITE) ? "CFU" : "CTU",
- vaddr + offset, buf, bytes);
- if (rw == WRITE) {
- left = copy_from_user(vaddr + offset, buf, bytes);
- if (updatechecksum) {
- struct ll_async_page *llap;
-
- llap = llap_cast_private(pages[i]);
- llap->llap_checksum = crc32_le(0, vaddr,
- CFS_PAGE_SIZE);
+ env = cl_env_nested_get(&nest);
+ if (IS_ERR(env))
+ RETURN(PTR_ERR(env));
+
+ io = &ccc_env_info(env)->cti_io;
+ queue = &vvp_env_info(env)->vti_queue;
+ clob = ll_i2info(inode)->lli_clob;
+ LASSERT(clob != NULL);
+
+ io->ci_obj = clob;
+ result = cl_io_init(env, io, CIT_MISC, clob);
+ if (result == 0) {
+ page = cl_page_find(env, clob, vmpage->index,
+ vmpage, CPT_CACHEABLE);
+ if (!IS_ERR(page)) {
+ lu_ref_add(&page->cp_reference, "writepage",
+ cfs_current());
+ cl_page_assume(env, io, page);
+ /*
+ * Mark page dirty, because this is what
+ * ->vio_submit()->cpo_prep_write() assumes.
+ *
+ * XXX better solution is to detect this from within
+ * cl_io_submit_rw() somehow.
+ */
+ set_page_dirty(vmpage);
+ cl_2queue_init_page(queue, page);
+ result = cl_io_submit_rw(env, io, CRT_WRITE, queue);
+ cl_page_list_disown(env, io, &queue->c2_qin);
+ if (result != 0) {
+ /*
+ * There is no need to clear PG_writeback, as
+ * cl_io_submit_rw() calls completion callback
+ * on failure.
+ */
+ /*
+ * Re-dirty page on error so it retries write,
+ * but not in case when IO has actually
+ * occurred and completed with an error.
+ */
+ if (!PageError(vmpage))
+ set_page_dirty(vmpage);
}
- } else {
- left = copy_to_user(buf, vaddr + offset, bytes);
- }
- kunmap(pages[i]);
- amount += bytes;
- if (left) {
- amount -= left;
- break;
+ LASSERT(!cl_page_is_owned(page, io));
+ lu_ref_del(&page->cp_reference,
+ "writepage", cfs_current());
+ cl_page_put(env, page);
+ cl_2queue_fini(env, queue);
}
- buf += bytes;
- count -= bytes;
- pos += bytes;
}
- if (amount == 0)
- RETURN(-EFAULT);
- RETURN(amount);
+ cl_io_fini(env, io);
+ cl_env_nested_put(&nest, env);
+ RETURN(result);
}
-static int ll_file_oig_pages(struct inode * inode, struct page **pages,
- int numpages, loff_t pos, size_t count, int rw)
+int ll_readpage(struct file *file, struct page *vmpage)
{
- struct obd_io_group *oig;
- struct ll_inode_info *lli = ll_i2info(inode);
- struct obd_export *exp;
- loff_t org_pos = pos;
- obd_flag brw_flags;
- int rc;
- int i;
+ struct lu_env *env;
+ struct cl_io *io;
+ struct cl_page *page;
+ int result;
+ int refcheck;
ENTRY;
- exp = ll_i2dtexp(inode);
- if (exp == NULL)
- RETURN(-EINVAL);
- rc = oig_init(&oig);
- if (rc)
- RETURN(rc);
- brw_flags = OBD_BRW_SRVLOCK;
- if (cfs_capable(CFS_CAP_SYS_RESOURCE))
- brw_flags |= OBD_BRW_NOQUOTA;
-
- for (i = 0; i < numpages; i++) {
- struct ll_async_page *llap;
- unsigned from, bytes;
-
- from = pos & (CFS_PAGE_SIZE - 1);
- bytes = min_t(unsigned, CFS_PAGE_SIZE - from,
- count - pos + org_pos);
- llap = llap_cast_private(pages[i]);
- LASSERT(llap);
-
- lock_page(pages[i]);
-
- LL_CDEBUG_PAGE(D_PAGE, pages[i], "offset "LPU64","
- " from %u, bytes = %u\n",
- (__u64)pos, from, bytes);
- LASSERTF(pos >> CFS_PAGE_SHIFT == pages[i]->index,
- "wrong page index %lu (%lu)\n",
- pages[i]->index,
- (unsigned long)(pos >> CFS_PAGE_SHIFT));
- rc = obd_queue_group_io(exp, lli->lli_smd, NULL, oig,
- llap->llap_cookie,
- (rw == WRITE) ?
- OBD_BRW_WRITE:OBD_BRW_READ,
- from, bytes, brw_flags,
- ASYNC_READY | ASYNC_URGENT |
- ASYNC_COUNT_STABLE | ASYNC_GROUP_SYNC);
- if (rc) {
- i++;
- GOTO(out, rc);
+ result = ll_cl_init(file, vmpage, &env, &io, &page, &refcheck);
+ if (result == 0) {
+ LASSERT(page->cp_type == CPT_CACHEABLE);
+ if (likely(!PageUptodate(vmpage))) {
+ cl_page_assume(env, io, page);
+ result = cl_io_read_page(env, io, page);
+ } else {
+ /* Page from a non-object file. */
+ LASSERT(!ll_i2info(vmpage->mapping->host)->lli_smd);
+ unlock_page(vmpage);
+ result = 0;
}
- pos += bytes;
}
- rc = obd_trigger_group_io(exp, lli->lli_smd, NULL, oig);
- if (rc)
- GOTO(out, rc);
- rc = oig_wait(oig);
-out:
- while(--i >= 0)
- unlock_page(pages[i]);
- oig_release(oig);
- RETURN(rc);
+ LASSERT(!cl_page_is_owned(page, io));
+ ll_cl_fini(env, io, page, &refcheck);
+ RETURN(result);
}
-ssize_t ll_file_lockless_io(struct file *file, char *buf, size_t count,
- loff_t *ppos, int rw)
-{
- loff_t pos;
- struct inode *inode = file->f_dentry->d_inode;
- ssize_t rc = 0;
- int max_pages;
- size_t amount = 0;
- unsigned long first, last;
- ENTRY;
-
- if (rw == READ) {
- loff_t isize;
-
- ll_inode_size_lock(inode, 0);
- isize = i_size_read(inode);
- ll_inode_size_unlock(inode, 0);
- if (*ppos >= isize)
- GOTO(out, rc = 0);
- if (*ppos + count >= isize)
- count -= *ppos + count - isize;
- if (count == 0)
- GOTO(out, rc);
- } else {
- rc = generic_write_checks(file, ppos, &count, 0);
- if (rc)
- GOTO(out, rc);
- rc = ll_remove_suid(file->f_dentry, file->f_vfsmnt);
- if (rc)
- GOTO(out, rc);
- }
- pos = *ppos;
- first = pos >> CFS_PAGE_SHIFT;
- last = (pos + count - 1) >> CFS_PAGE_SHIFT;
- max_pages = PTLRPC_MAX_BRW_PAGES *
- ll_i2info(inode)->lli_smd->lsm_stripe_count;
- CDEBUG(D_INFO, "%u, stripe_count = %u\n",
- PTLRPC_MAX_BRW_PAGES /* max_pages_per_rpc */,
- ll_i2info(inode)->lli_smd->lsm_stripe_count);
-
- while (first <= last && rc >= 0) {
- int pages_for_io;
- struct page **pages;
- size_t bytes = count - amount;
-
- pages_for_io = min_t(int, last - first + 1, max_pages);
- pages = ll_file_prepare_pages(pages_for_io, inode, first);
- if (IS_ERR(pages)) {
- rc = PTR_ERR(pages);
- break;
- }
- if (rw == WRITE) {
- rc = ll_file_copy_pages(pages, pages_for_io, buf,
- pos + amount, bytes, rw);
- if (rc < 0)
- GOTO(put_pages, rc);
- bytes = rc;
- }
- rc = ll_file_oig_pages(inode, pages, pages_for_io,
- pos + amount, bytes, rw);
- if (rc)
- GOTO(put_pages, rc);
- if (rw == READ) {
- rc = ll_file_copy_pages(pages, pages_for_io, buf,
- pos + amount, bytes, rw);
- if (rc < 0)
- GOTO(put_pages, rc);
- bytes = rc;
- }
- amount += bytes;
- buf += bytes;
-put_pages:
- ll_file_put_pages(pages, pages_for_io);
- first += pages_for_io;
- /* a short read/write check */
- if (pos + amount < ((loff_t)first << CFS_PAGE_SHIFT))
- break;
- }
- /* NOTE: don't update i_size and KMS in absence of LDLM locks even
- * write makes the file large */
- file_accessed(file);
- if (rw == READ && amount < count && rc == 0) {
- unsigned long not_cleared;
-
- not_cleared = clear_user(buf, count - amount);
- amount = count - not_cleared;
- if (not_cleared)
- rc = -EFAULT;
- }
- if (amount > 0) {
- lprocfs_counter_add(ll_i2sbi(inode)->ll_stats,
- (rw == WRITE) ?
- LPROC_LL_LOCKLESS_WRITE :
- LPROC_LL_LOCKLESS_READ,
- (long)amount);
- *ppos += amount;
- RETURN(amount);
- }
-out:
- RETURN(rc);
-}