RETURN(rc);
}
-/**
- * Get current minimum entry from striped directory
- *
- * This function will search the dir entry, whose hash value is the
- * closest(>=) to @hash_offset, from all of sub-stripes, and it is
- * only being called for striped directory.
- *
- * \param[in] exp export of LMV
- * \param[in] op_data parameters transferred beween client MD stack
- * stripe_information will be included in this
- * parameter
- * \param[in] cb_op ldlm callback being used in enqueue in
- * mdc_read_page
- * \param[in] hash_offset the hash value, which is used to locate
- * minum(closet) dir entry
- * \param[in|out] stripe_offset the caller use this to indicate the stripe
- * index of last entry, so to avoid hash conflict
- * between stripes. It will also be used to
- * return the stripe index of current dir entry.
- * \param[in|out] entp the minum entry and it also is being used
- * to input the last dir entry to resolve the
- * hash conflict
- *
- * \param[out] ppage the page which holds the minum entry
- *
- * \retval = 0 get the entry successfully
- * negative errno (< 0) does not get the entry
- */
-static int lmv_get_min_striped_entry(struct obd_export *exp,
- struct md_op_data *op_data,
- struct md_callback *cb_op,
- __u64 hash_offset, int *stripe_offset,
- struct lu_dirent **entp,
- struct page **ppage)
+struct stripe_dirent {
+ struct page *sd_page;
+ struct lu_dirpage *sd_dp;
+ struct lu_dirent *sd_ent;
+ bool sd_eof;
+};
+
+struct lmv_dir_ctxt {
+ struct lmv_obd *ldc_lmv;
+ struct md_op_data *ldc_op_data;
+ struct md_callback *ldc_cb_op;
+ __u64 ldc_hash;
+ int ldc_count;
+ struct stripe_dirent ldc_stripes[0];
+};
+
+static inline void put_stripe_dirent(struct stripe_dirent *stripe)
{
- struct obd_device *obd = exp->exp_obd;
- struct lmv_obd *lmv = &obd->u.lmv;
- struct lmv_stripe_md *lsm = op_data->op_mea1;
- struct lmv_tgt_desc *tgt;
- int stripe_count;
- struct lu_dirent *min_ent = NULL;
- struct page *min_page = NULL;
- int min_idx = 0;
- int i;
- int rc = 0;
+ if (stripe->sd_page) {
+ kunmap(stripe->sd_page);
+ put_page(stripe->sd_page);
+ stripe->sd_page = NULL;
+ }
+}
+
+static inline void put_lmv_dir_ctxt(struct lmv_dir_ctxt *ctxt)
+{
+ int i;
+
+ for (i = 0; i < ctxt->ldc_count; i++)
+ put_stripe_dirent(&ctxt->ldc_stripes[i]);
+}
+
+static struct lu_dirent *stripe_dirent_next(struct lmv_dir_ctxt *ctxt,
+ struct stripe_dirent *stripe,
+ int stripe_index)
+{
+ struct lu_dirent *ent = stripe->sd_ent;
+ __u64 hash = ctxt->ldc_hash;
+ __u64 end;
+ int rc = 0;
ENTRY;
- stripe_count = lsm->lsm_md_stripe_count;
- for (i = 0; i < stripe_count; i++) {
- struct lu_dirent *ent = NULL;
- struct page *page = NULL;
- struct lu_dirpage *dp;
- __u64 stripe_hash = hash_offset;
+ LASSERT(stripe == &ctxt->ldc_stripes[stripe_index]);
+
+ if (ent) {
+ ent = lu_dirent_next(ent);
+ if (!ent) {
+check_eof:
+ end = le64_to_cpu(stripe->sd_dp->ldp_hash_end);
+
+ put_stripe_dirent(stripe);
+
+ if (end == MDS_DIR_END_OFF) {
+ stripe->sd_ent = NULL;
+ stripe->sd_eof = true;
+ RETURN(NULL);
+ }
+ LASSERT(hash <= end);
+ hash = end;
+ }
+ }
- tgt = lmv_get_target(lmv, lsm->lsm_md_oinfo[i].lmo_mds, NULL);
+ if (!ent) {
+ struct md_op_data *op_data = ctxt->ldc_op_data;
+ struct lmv_oinfo *oinfo;
+ struct lu_fid fid = op_data->op_fid1;
+ struct inode *inode = op_data->op_data;
+ struct lmv_tgt_desc *tgt;
+
+ LASSERT(!stripe->sd_page);
+
+ oinfo = &op_data->op_mea1->lsm_md_oinfo[stripe_index];
+ tgt = lmv_get_target(ctxt->ldc_lmv, oinfo->lmo_mds, NULL);
if (IS_ERR(tgt))
GOTO(out, rc = PTR_ERR(tgt));
/* op_data will be shared by each stripe, so we need
* reset these value for each stripe */
- op_data->op_fid1 = lsm->lsm_md_oinfo[i].lmo_fid;
- op_data->op_fid2 = lsm->lsm_md_oinfo[i].lmo_fid;
- op_data->op_data = lsm->lsm_md_oinfo[i].lmo_root;
-next:
- rc = md_read_page(tgt->ltd_exp, op_data, cb_op, stripe_hash,
- &page);
- if (rc != 0)
+ op_data->op_fid1 = oinfo->lmo_fid;
+ op_data->op_fid2 = oinfo->lmo_fid;
+ op_data->op_data = oinfo->lmo_root;
+
+ rc = md_read_page(tgt->ltd_exp, op_data, ctxt->ldc_cb_op, hash,
+ &stripe->sd_page);
+
+ op_data->op_fid1 = fid;
+ op_data->op_fid2 = fid;
+ op_data->op_data = inode;
+
+ if (rc)
GOTO(out, rc);
- dp = page_address(page);
- for (ent = lu_dirent_start(dp); ent != NULL;
- ent = lu_dirent_next(ent)) {
- /* Skip dummy entry */
- if (le16_to_cpu(ent->lde_namelen) == 0)
- continue;
+ stripe->sd_dp = page_address(stripe->sd_page);
+ ent = lu_dirent_start(stripe->sd_dp);
+ }
- if (le64_to_cpu(ent->lde_hash) < hash_offset)
- continue;
+ for (; ent; ent = lu_dirent_next(ent)) {
+ /* Skip dummy entry */
+ if (le16_to_cpu(ent->lde_namelen) == 0)
+ continue;
- if (le64_to_cpu(ent->lde_hash) == hash_offset &&
- (*entp == ent || i < *stripe_offset))
- continue;
+ /* skip . and .. for other stripes */
+ if (stripe_index &&
+ (strncmp(ent->lde_name, ".",
+ le16_to_cpu(ent->lde_namelen)) == 0 ||
+ strncmp(ent->lde_name, "..",
+ le16_to_cpu(ent->lde_namelen)) == 0))
+ continue;
- /* skip . and .. for other stripes */
- if (i != 0 &&
- (strncmp(ent->lde_name, ".",
- le16_to_cpu(ent->lde_namelen)) == 0 ||
- strncmp(ent->lde_name, "..",
- le16_to_cpu(ent->lde_namelen)) == 0))
- continue;
- break;
- }
+ if (le64_to_cpu(ent->lde_hash) < hash)
+ continue;
- if (ent == NULL) {
- stripe_hash = le64_to_cpu(dp->ldp_hash_end);
+ break;
+ }
- kunmap(page);
- put_page(page);
- page = NULL;
+ if (!ent)
+ goto check_eof;
+ EXIT;
- /* reach the end of current stripe, go to next stripe */
- if (stripe_hash == MDS_DIR_END_OFF)
+out:
+ stripe->sd_ent = ent;
+ /* treat error as eof, so dir can be partially accessed */
+ if (rc) {
+ put_stripe_dirent(stripe);
+ stripe->sd_eof = true;
+ LCONSOLE_WARN("dir "DFID" stripe %d readdir failed: %d, "
+ "directory is partially accessed!\n",
+ PFID(&ctxt->ldc_op_data->op_fid1), stripe_index,
+ rc);
+ }
+ return ent;
+}
+
+/**
+ * Get dirent with the closest hash for striped directory
+ *
+ * This function will search the dir entry, whose hash value is the
+ * closest(>=) to hash from all of sub-stripes, and it is only being called
+ * for striped directory.
+ *
+ * \param[in] ctxt dir read context
+ *
+ * \retval dirent get the entry successfully
+ * NULL does not get the entry, normally it means
+ * it reaches the end of the directory, while read
+ * stripe dirent error is ignored to allow partial
+ * access.
+ */
+static struct lu_dirent *lmv_dirent_next(struct lmv_dir_ctxt *ctxt)
+{
+ struct stripe_dirent *stripe;
+ struct lu_dirent *ent = NULL;
+ int i;
+ int min = -1;
+
+ /* TODO: optimize with k-way merge sort */
+ for (i = 0; i < ctxt->ldc_count; i++) {
+ stripe = &ctxt->ldc_stripes[i];
+ if (stripe->sd_eof)
+ continue;
+
+ if (!stripe->sd_ent) {
+ /* locate starting entry */
+ stripe_dirent_next(ctxt, stripe, i);
+ if (!stripe->sd_ent) {
+ LASSERT(stripe->sd_eof);
continue;
- else
- goto next;
+ }
}
- if (min_ent != NULL) {
- if (le64_to_cpu(min_ent->lde_hash) >
- le64_to_cpu(ent->lde_hash)) {
- min_ent = ent;
- kunmap(min_page);
- put_page(min_page);
- min_idx = i;
- min_page = page;
- } else {
- kunmap(page);
- put_page(page);
- page = NULL;
- }
- } else {
- min_ent = ent;
- min_page = page;
- min_idx = i;
+ if (min == -1 ||
+ le64_to_cpu(ctxt->ldc_stripes[min].sd_ent->lde_hash) >
+ le64_to_cpu(stripe->sd_ent->lde_hash)) {
+ min = i;
+ if (le64_to_cpu(stripe->sd_ent->lde_hash) ==
+ ctxt->ldc_hash)
+ break;
}
}
-out:
- if (*ppage != NULL) {
- kunmap(*ppage);
- put_page(*ppage);
+ if (min != -1) {
+ stripe = &ctxt->ldc_stripes[min];
+ ent = stripe->sd_ent;
+ /* pop found dirent */
+ stripe_dirent_next(ctxt, stripe, min);
}
- *stripe_offset = min_idx;
- *entp = min_ent;
- *ppage = min_page;
- RETURN(rc);
+
+ return ent;
}
/**
- * Build dir entry page from a striped directory
+ * Build dir entry page for striped directory
*
* This function gets one entry by @offset from a striped directory. It will
* read entries from all of stripes, and choose one closest to the required
* and .. in a directory.
* 2. op_data will be shared by all of stripes, instead of allocating new
* one, so need to restore before reusing.
- * 3. release the entry page if that is not being chosen.
*
* \param[in] exp obd export refer to LMV
* \param[in] op_data hold those MD parameters of read_entry
* \param[in] cb_op ldlm callback being used in enqueue in mdc_read_entry
- * \param[out] ldp the entry being read
+ * \param[in] offset starting hash offset
* \param[out] ppage the page holding the entry. Note: because the entry
* will be accessed in upper layer, so we need hold the
* page until the usages of entry is finished, see
* retval =0 if get entry successfully
* <0 cannot get entry
*/
-static int lmv_read_striped_page(struct obd_export *exp,
+static int lmv_striped_read_page(struct obd_export *exp,
struct md_op_data *op_data,
struct md_callback *cb_op,
__u64 offset, struct page **ppage)
{
- struct lu_fid master_fid = op_data->op_fid1;
- struct inode *master_inode = op_data->op_data;
- __u64 hash_offset = offset;
- struct lu_dirpage *dp;
- struct page *min_ent_page = NULL;
- struct page *ent_page = NULL;
- struct lu_dirent *ent;
- void *area;
- int ent_idx = 0;
- struct lu_dirent *min_ent = NULL;
- struct lu_dirent *last_ent;
- size_t left_bytes;
- int rc;
+ struct page *page = NULL;
+ struct lu_dirpage *dp;
+ void *start;
+ struct lu_dirent *ent;
+ struct lu_dirent *last_ent;
+ int stripe_count;
+ struct lmv_dir_ctxt *ctxt;
+ struct lu_dirent *next = NULL;
+ __u16 ent_size;
+ size_t left_bytes;
+ int rc = 0;
ENTRY;
/* Allocate a page and read entries from all of stripes and fill
* the page by hash order */
- ent_page = alloc_page(GFP_KERNEL);
- if (ent_page == NULL)
+ page = alloc_page(GFP_KERNEL);
+ if (!page)
RETURN(-ENOMEM);
/* Initialize the entry page */
- dp = kmap(ent_page);
+ dp = kmap(page);
memset(dp, 0, sizeof(*dp));
dp->ldp_hash_start = cpu_to_le64(offset);
- dp->ldp_flags |= LDF_COLLIDE;
- area = dp + 1;
+ start = dp + 1;
left_bytes = PAGE_SIZE - sizeof(*dp);
- ent = area;
+ ent = start;
last_ent = ent;
- do {
- __u16 ent_size;
-
- /* Find the minum entry from all sub-stripes */
- rc = lmv_get_min_striped_entry(exp, op_data, cb_op, hash_offset,
- &ent_idx, &min_ent,
- &min_ent_page);
- if (rc != 0)
- GOTO(out, rc);
- /* If it can not get minum entry, it means it already reaches
- * the end of this directory */
- if (min_ent == NULL) {
- last_ent->lde_reclen = 0;
- hash_offset = MDS_DIR_END_OFF;
- GOTO(out, rc);
+ /* initalize dir read context */
+ stripe_count = op_data->op_mea1->lsm_md_stripe_count;
+ OBD_ALLOC(ctxt, offsetof(typeof(*ctxt), ldc_stripes[stripe_count]));
+ if (!ctxt)
+ GOTO(free_page, rc = -ENOMEM);
+ ctxt->ldc_lmv = &exp->exp_obd->u.lmv;
+ ctxt->ldc_op_data = op_data;
+ ctxt->ldc_cb_op = cb_op;
+ ctxt->ldc_hash = offset;
+ ctxt->ldc_count = stripe_count;
+
+ while (1) {
+ next = lmv_dirent_next(ctxt);
+
+ /* end of directory */
+ if (!next) {
+ ctxt->ldc_hash = MDS_DIR_END_OFF;
+ break;
}
+ ctxt->ldc_hash = le64_to_cpu(next->lde_hash);
- ent_size = le16_to_cpu(min_ent->lde_reclen);
+ ent_size = le16_to_cpu(next->lde_reclen);
- /* the last entry lde_reclen is 0, but it might not
- * the end of this entry of this temporay entry */
- if (ent_size == 0)
+ /* the last entry lde_reclen is 0, but it might not be the last
+ * one of this temporay dir page */
+ if (!ent_size)
ent_size = lu_dirent_calc_size(
- le16_to_cpu(min_ent->lde_namelen),
- le32_to_cpu(min_ent->lde_attrs));
- if (ent_size > left_bytes) {
- last_ent->lde_reclen = cpu_to_le16(0);
- hash_offset = le64_to_cpu(min_ent->lde_hash);
- GOTO(out, rc);
- }
+ le16_to_cpu(next->lde_namelen),
+ le32_to_cpu(next->lde_attrs));
+ /* page full */
+ if (ent_size > left_bytes)
+ break;
- memcpy(ent, min_ent, ent_size);
+ memcpy(ent, next, ent_size);
/* Replace . with master FID and Replace .. with the parent FID
* of master object */
if (strncmp(ent->lde_name, ".",
le16_to_cpu(ent->lde_namelen)) == 0 &&
le16_to_cpu(ent->lde_namelen) == 1)
- fid_cpu_to_le(&ent->lde_fid, &master_fid);
+ fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid1);
else if (strncmp(ent->lde_name, "..",
le16_to_cpu(ent->lde_namelen)) == 0 &&
le16_to_cpu(ent->lde_namelen) == 2)
fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
+ CDEBUG(D_INODE, "entry %.*s hash %#llx\n",
+ le16_to_cpu(ent->lde_namelen), ent->lde_name,
+ le64_to_cpu(ent->lde_hash));
+
left_bytes -= ent_size;
ent->lde_reclen = cpu_to_le16(ent_size);
last_ent = ent;
ent = (void *)ent + ent_size;
- hash_offset = le64_to_cpu(min_ent->lde_hash);
- if (hash_offset == MDS_DIR_END_OFF) {
- last_ent->lde_reclen = 0;
- break;
- }
- } while (1);
-out:
- if (min_ent_page != NULL) {
- kunmap(min_ent_page);
- put_page(min_ent_page);
- }
+ };
- if (unlikely(rc != 0)) {
- __free_page(ent_page);
- ent_page = NULL;
- } else {
- if (ent == area)
- dp->ldp_flags |= LDF_EMPTY;
- dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
- dp->ldp_hash_end = cpu_to_le64(hash_offset);
- }
+ last_ent->lde_reclen = 0;
- /* We do not want to allocate md_op_data during each
- * dir entry reading, so op_data will be shared by every stripe,
- * then we need to restore it back to original value before
- * return to the upper layer */
- op_data->op_fid1 = master_fid;
- op_data->op_fid2 = master_fid;
- op_data->op_data = master_inode;
+ if (ent == start)
+ dp->ldp_flags |= LDF_EMPTY;
+ else if (ctxt->ldc_hash == le64_to_cpu(last_ent->lde_hash))
+ dp->ldp_flags |= LDF_COLLIDE;
+ dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
+ dp->ldp_hash_end = cpu_to_le64(ctxt->ldc_hash);
- *ppage = ent_page;
+ put_lmv_dir_ctxt(ctxt);
+ OBD_FREE(ctxt, offsetof(typeof(*ctxt), ldc_stripes[stripe_count]));
- RETURN(rc);
+ *ppage = page;
+
+ RETURN(0);
+
+free_page:
+ kunmap(page);
+ __free_page(page);
+
+ return rc;
}
int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
ENTRY;
if (unlikely(lsm != NULL)) {
- rc = lmv_read_striped_page(exp, op_data, cb_op, offset, ppage);
+ rc = lmv_striped_read_page(exp, op_data, cb_op, offset, ppage);
RETURN(rc);
}
git://git.whamcloud.com / fs / lustre-release.git / commitdiff