return rc;
}
-/*
- * Adjust a set of pages, each page containing an array of lu_dirpages,
- * so that each page can be used as a single logical lu_dirpage.
- *
- * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
- * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
- * struct lu_dirent. It has size up to LU_PAGE_SIZE. The ldp_hash_end
- * value is used as a cookie to request the next lu_dirpage in a
- * directory listing that spans multiple pages (two in this example):
- * ________
- * | |
- * .|--------v------- -----.
- * |s|e|f|p|ent|ent| ... |ent|
- * '--|-------------- -----' Each CFS_PAGE contains a single
- * '------. lu_dirpage.
- * .---------v------- -----.
- * |s|e|f|p|ent| 0 | ... | 0 |
- * '----------------- -----'
- *
- * However, on hosts where the native VM page size (PAGE_SIZE) is
- * larger than LU_PAGE_SIZE, a single host page may contain multiple
- * lu_dirpages. After reading the lu_dirpages from the MDS, the
- * ldp_hash_end of the first lu_dirpage refers to the one immediately
- * after it in the same CFS_PAGE (arrows simplified for brevity, but
- * in general e0==s1, e1==s2, etc.):
- *
- * .-------------------- -----.
- * |s0|e0|f0|p|ent|ent| ... |ent|
- * |---v---------------- -----|
- * |s1|e1|f1|p|ent|ent| ... |ent|
- * |---v---------------- -----| Here, each CFS_PAGE contains
- * ... multiple lu_dirpages.
- * |---v---------------- -----|
- * |s'|e'|f'|p|ent|ent| ... |ent|
- * '---|---------------- -----'
- * v
- * .----------------------------.
- * | next CFS_PAGE |
- *
- * This structure is transformed into a single logical lu_dirpage as follows:
- *
- * - Replace e0 with e' so the request for the next lu_dirpage gets the page
- * labeled 'next CFS_PAGE'.
- *
- * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
- * a hash collision with the next page exists.
- *
- * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
- * to the first entry of the next lu_dirpage.
- */
-#if PAGE_SIZE > LU_PAGE_SIZE
-static void lmv_adjust_dirpages(struct page **pages, int ncfspgs, int nlupgs)
-{
- int i;
-
- for (i = 0; i < ncfspgs; i++) {
- struct lu_dirpage *dp = kmap(pages[i]);
- struct lu_dirpage *first = dp;
- struct lu_dirent *end_dirent = NULL;
- struct lu_dirent *ent;
- __u64 hash_end = dp->ldp_hash_end;
- __u32 flags = dp->ldp_flags;
-
- while (--nlupgs > 0) {
- ent = lu_dirent_start(dp);
- for (end_dirent = ent; ent;
- end_dirent = ent, ent = lu_dirent_next(ent))
- ;
-
- /* Advance dp to next lu_dirpage. */
- dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
-
- /* Check if we've reached the end of the CFS_PAGE. */
- if (!((unsigned long)dp & ~PAGE_MASK))
- break;
-
- /* Save the hash and flags of this lu_dirpage. */
- hash_end = dp->ldp_hash_end;
- flags = dp->ldp_flags;
-
- /* Check if lu_dirpage contains no entries. */
- if (!end_dirent)
- break;
-
- /* Enlarge the end entry lde_reclen from 0 to
- * first entry of next lu_dirpage.
- */
- LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
- end_dirent->lde_reclen =
- cpu_to_le16((char *)(dp->ldp_entries) -
- (char *)end_dirent);
- }
-
- first->ldp_hash_end = hash_end;
- first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
- first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
-
- kunmap(pages[i]);
- }
- LASSERTF(nlupgs == 0, "left = %d", nlupgs);
-}
-#else
-#define lmv_adjust_dirpages(pages, ncfspgs, nlupgs) do {} while (0)
-#endif /* PAGE_SIZE > LU_PAGE_SIZE */
-
-static int lmv_readpage(struct obd_export *exp, struct md_op_data *op_data,
- struct page **pages, struct ptlrpc_request **request)
-{
- struct obd_device *obd = exp->exp_obd;
- struct lmv_obd *lmv = &obd->u.lmv;
- __u64 offset = op_data->op_offset;
- int rc;
- int ncfspgs; /* pages read in PAGE_SIZE */
- int nlupgs; /* pages read in LU_PAGE_SIZE */
- struct lmv_tgt_desc *tgt;
-
- rc = lmv_check_connect(obd);
- if (rc)
- return rc;
-
- CDEBUG(D_INODE, "READPAGE at %#llx from "DFID"\n",
- offset, PFID(&op_data->op_fid1));
-
- tgt = lmv_find_target(lmv, &op_data->op_fid1);
- if (IS_ERR(tgt))
- return PTR_ERR(tgt);
-
- rc = md_readpage(tgt->ltd_exp, op_data, pages, request);
- if (rc != 0)
- return rc;
-
- ncfspgs = ((*request)->rq_bulk->bd_nob_transferred + PAGE_SIZE - 1)
- >> PAGE_SHIFT;
- nlupgs = (*request)->rq_bulk->bd_nob_transferred >> LU_PAGE_SHIFT;
- LASSERT(!((*request)->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK));
- LASSERT(ncfspgs > 0 && ncfspgs <= op_data->op_npages);
-
- CDEBUG(D_INODE, "read %d(%d)/%d pages\n", ncfspgs, nlupgs,
- op_data->op_npages);
-
- lmv_adjust_dirpages(pages, ncfspgs, nlupgs);
-
- return rc;
-}
-
/**
* Get current minimum entry from striped directory
*
.setattr = lmv_setattr,
.setxattr = lmv_setxattr,
.sync = lmv_sync,
- .readpage = lmv_readpage,
.read_page = lmv_read_page,
.unlink = lmv_unlink,
.init_ea_size = lmv_init_ea_size,
return rc;
}
-static int mdc_readpage(struct obd_export *exp, struct md_op_data *op_data,
- struct page **pages, struct ptlrpc_request **request)
-{
- struct ptlrpc_request *req;
- struct ptlrpc_bulk_desc *desc;
- int i;
- wait_queue_head_t waitq;
- int resends = 0;
- struct l_wait_info lwi;
- int rc;
-
- *request = NULL;
- init_waitqueue_head(&waitq);
-
-restart_bulk:
- req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_READPAGE);
- if (!req)
- return -ENOMEM;
-
- rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_READPAGE);
- if (rc) {
- ptlrpc_request_free(req);
- return rc;
- }
-
- req->rq_request_portal = MDS_READPAGE_PORTAL;
- ptlrpc_at_set_req_timeout(req);
-
- desc = ptlrpc_prep_bulk_imp(req, op_data->op_npages, 1, BULK_PUT_SINK,
- MDS_BULK_PORTAL);
- if (!desc) {
- ptlrpc_request_free(req);
- return -ENOMEM;
- }
-
- /* NB req now owns desc and will free it when it gets freed */
- for (i = 0; i < op_data->op_npages; i++)
- ptlrpc_prep_bulk_page_pin(desc, pages[i], 0, PAGE_SIZE);
-
- mdc_readdir_pack(req, op_data->op_offset,
- PAGE_SIZE * op_data->op_npages,
- &op_data->op_fid1);
-
- ptlrpc_request_set_replen(req);
- rc = ptlrpc_queue_wait(req);
- if (rc) {
- ptlrpc_req_finished(req);
- if (rc != -ETIMEDOUT)
- return rc;
-
- resends++;
- if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
- CERROR("too many resend retries, returning error\n");
- return -EIO;
- }
- lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(resends),
- NULL, NULL, NULL);
- l_wait_event(waitq, 0, &lwi);
-
- goto restart_bulk;
- }
-
- rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
- req->rq_bulk->bd_nob_transferred);
- if (rc < 0) {
- ptlrpc_req_finished(req);
- return rc;
- }
-
- if (req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK) {
- CERROR("Unexpected # bytes transferred: %d (%ld expected)\n",
- req->rq_bulk->bd_nob_transferred,
- PAGE_SIZE * op_data->op_npages);
- ptlrpc_req_finished(req);
- return -EPROTO;
- }
-
- *request = req;
- return 0;
-}
-
static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
u64 offset, struct page **pages, int npages,
struct ptlrpc_request **request)
.setxattr = mdc_setxattr,
.getxattr = mdc_getxattr,
.sync = mdc_sync,
- .readpage = mdc_readpage,
.read_page = mdc_read_page,
.unlink = mdc_unlink,
.cancel_unused = mdc_cancel_unused,
projects / platform / kernel / linux-rpi.git / commitdiff