/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * Lustre Light Super operations
+ * Lustre Light block IO
*
- * Copyright (c) 2002, 2003 Cluster File Systems, Inc.
+ * Copyright (c) 2002-2004 Cluster File Systems, Inc.
*
* This file is part of Lustre, http://www.lustre.org.
*
#include <stdlib.h>
#include <string.h>
-#include <error.h>
#include <assert.h>
#include <time.h>
#include <sys/types.h>
+#include <sys/stat.h>
#include <sys/queue.h>
+#include <fcntl.h>
+#include <sys/uio.h>
#include <sysio.h>
+#ifdef HAVE_XTIO_H
+#include <xtio.h>
+#endif
#include <fs.h>
#include <mount.h>
#include <inode.h>
+#ifdef HAVE_FILE_H
#include <file.h>
+#endif
+
+#undef LIST_HEAD
#include "llite_lib.h"
-int llu_iop_iodone(struct ioctx *ioctxp __IS_UNUSED)
+struct llu_io_group
+{
+ struct obd_io_group *lig_oig;
+ struct inode *lig_inode;
+ struct lustre_rw_params *lig_params;
+ int lig_maxpages;
+ int lig_npages;
+ __u64 lig_rwcount;
+ struct ll_async_page *lig_llaps;
+ struct page *lig_pages;
+ void *lig_llap_cookies;
+};
+
+#define LLU_IO_GROUP_SIZE(x) \
+ (sizeof(struct llu_io_group) + \
+ (sizeof(struct ll_async_page) + \
+ sizeof(struct page) + \
+ llap_cookie_size) * (x))
+
+struct llu_io_session
+{
+ struct inode *lis_inode;
+ int lis_cmd;
+ int lis_max_groups;
+ int lis_ngroups;
+ struct llu_io_group *lis_groups[0];
+};
+#define LLU_IO_SESSION_SIZE(x) \
+ (sizeof(struct llu_io_session) + (x) * 2 * sizeof(void *))
+
+
+typedef ssize_t llu_file_piov_t(const struct iovec *iovec, int iovlen,
+ _SYSIO_OFF_T pos, ssize_t len,
+ void *private);
+
+size_t llap_cookie_size;
+
+static int llu_lock_to_stripe_offset(struct inode *inode, struct ldlm_lock *lock)
{
- return 1;
+ struct llu_inode_info *lli = llu_i2info(inode);
+ struct lov_stripe_md *lsm = lli->lli_smd;
+ struct obd_export *exp = llu_i2obdexp(inode);
+ struct {
+ char name[16];
+ struct ldlm_lock *lock;
+ struct lov_stripe_md *lsm;
+ } key = { .name = "lock_to_stripe", .lock = lock, .lsm = lsm };
+ __u32 stripe, vallen = sizeof(stripe);
+ int rc;
+ ENTRY;
+
+ if (lsm->lsm_stripe_count == 1)
+ RETURN(0);
+
+ /* get our offset in the lov */
+ rc = obd_get_info(exp, sizeof(key), &key, &vallen, &stripe);
+ if (rc != 0) {
+ CERROR("obd_get_info: rc = %d\n", rc);
+ LBUG();
+ }
+ LASSERT(stripe < lsm->lsm_stripe_count);
+ RETURN(stripe);
}
-/*
- * this grabs a lock and manually implements behaviour that makes it look
- * like the OST is returning the file size with each lock acquisition
- */
-int llu_extent_lock(struct ll_file_data *fd, struct inode *inode,
- struct lov_stripe_md *lsm,
- int mode, struct ldlm_extent *extent,
- struct lustre_handle *lockh)
+static int llu_extent_lock_callback(struct ldlm_lock *lock,
+ struct ldlm_lock_desc *new, void *data,
+ int flag)
{
-#if 0
- struct ll_inode_info *lli = ll_i2info(inode);
+ struct lustre_handle lockh = { 0 };
int rc;
ENTRY;
- rc = ll_extent_lock_no_validate(fd, inode, lsm, mode, extent, lockh);
- if (rc != ELDLM_OK)
- RETURN(rc);
+ if ((unsigned long)data > 0 && (unsigned long)data < 0x1000) {
+ LDLM_ERROR(lock, "cancelling lock with bad data %p", data);
+ LBUG();
+ }
- /* always do a getattr for the first person to pop out of lock
- * acquisition.. the DID_GETATTR flag and semaphore serialize
- * this initial race. we used to make a decision based on whether
- * the lock was matched or acquired, but the matcher could win the
- * waking race with the first issuer so that was no good..
- */
- if (test_bit(LLI_F_DID_GETATTR, &lli->lli_flags))
- RETURN(ELDLM_OK);
+ switch (flag) {
+ case LDLM_CB_BLOCKING:
+ ldlm_lock2handle(lock, &lockh);
+ rc = ldlm_cli_cancel(&lockh);
+ if (rc != ELDLM_OK)
+ CERROR("ldlm_cli_cancel failed: %d\n", rc);
+ break;
+ case LDLM_CB_CANCELING: {
+ struct inode *inode;
+ struct llu_inode_info *lli;
+ struct lov_stripe_md *lsm;
+ __u32 stripe;
+ __u64 kms;
+
+ /* This lock wasn't granted, don't try to evict pages */
+ if (lock->l_req_mode != lock->l_granted_mode)
+ RETURN(0);
- down(&lli->lli_getattr_sem);
+ inode = llu_inode_from_lock(lock);
+ if (!inode)
+ RETURN(0);
+ lli= llu_i2info(inode);
+ if (!lli)
+ goto iput;
+ if (!lli->lli_smd)
+ goto iput;
+ lsm = lli->lli_smd;
+
+ stripe = llu_lock_to_stripe_offset(inode, lock);
+ lock_res_and_lock(lock);
+ kms = ldlm_extent_shift_kms(lock,
+ lsm->lsm_oinfo[stripe]->loi_kms);
+ unlock_res_and_lock(lock);
+ if (lsm->lsm_oinfo[stripe]->loi_kms != kms)
+ LDLM_DEBUG(lock, "updating kms from "LPU64" to "LPU64,
+ lsm->lsm_oinfo[stripe]->loi_kms, kms);
+ lsm->lsm_oinfo[stripe]->loi_kms = kms;
+iput:
+ I_RELE(inode);
+ break;
+ }
+ default:
+ LBUG();
+ }
- if (!test_bit(LLI_F_DID_GETATTR, &lli->lli_flags)) {
- rc = ll_inode_getattr(inode, lsm, fd ? &fd->fd_ost_och : NULL);
- if (rc == 0) {
- set_bit(LLI_F_DID_GETATTR, &lli->lli_flags);
- } else {
- /* XXX can this fail? */
- ll_extent_unlock(fd, inode, lsm, mode, lockh);
- }
+ RETURN(0);
+}
+
+static int llu_glimpse_callback(struct ldlm_lock *lock, void *reqp)
+{
+ struct ptlrpc_request *req = reqp;
+ struct inode *inode = llu_inode_from_lock(lock);
+ struct llu_inode_info *lli;
+ struct ost_lvb *lvb;
+ int size[2] = { sizeof(struct ptlrpc_body), sizeof(*lvb) };
+ int rc, stripe = 0;
+ ENTRY;
+
+ if (inode == NULL)
+ GOTO(out, rc = -ELDLM_NO_LOCK_DATA);
+ lli = llu_i2info(inode);
+ if (lli == NULL)
+ GOTO(iput, rc = -ELDLM_NO_LOCK_DATA);
+ if (lli->lli_smd == NULL)
+ GOTO(iput, rc = -ELDLM_NO_LOCK_DATA);
+
+ /* First, find out which stripe index this lock corresponds to. */
+ if (lli->lli_smd->lsm_stripe_count > 1)
+ stripe = llu_lock_to_stripe_offset(inode, lock);
+
+ rc = lustre_pack_reply(req, 2, size, NULL);
+ if (rc) {
+ CERROR("lustre_pack_reply: %d\n", rc);
+ GOTO(iput, rc);
}
- up(&lli->lli_getattr_sem);
- RETURN(rc);
-#else
- return ELDLM_OK;
-#endif
+ lvb = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF, sizeof(*lvb));
+ lvb->lvb_size = lli->lli_smd->lsm_oinfo[stripe]->loi_kms;
+
+ LDLM_DEBUG(lock, "i_size: %llu -> stripe number %u -> kms "LPU64,
+ (__u64)llu_i2stat(inode)->st_size, stripe,lvb->lvb_size);
+ iput:
+ I_RELE(inode);
+ out:
+ /* These errors are normal races, so we don't want to fill the console
+ * with messages by calling ptlrpc_error() */
+ if (rc == -ELDLM_NO_LOCK_DATA)
+ lustre_pack_reply(req, 1, NULL, NULL);
+
+ req->rq_status = rc;
+ return rc;
}
-int ll_extent_unlock(struct ll_file_data *fd, struct inode *inode,
- struct lov_stripe_md *lsm, int mode,
- struct lustre_handle *lockh)
+static void llu_merge_lvb(struct inode *inode)
{
-#if 0
- struct ll_sb_info *sbi = ll_i2sbi(inode);
- int rc;
+ struct llu_inode_info *lli = llu_i2info(inode);
+ struct llu_sb_info *sbi = llu_i2sbi(inode);
+ struct intnl_stat *st = llu_i2stat(inode);
+ struct ost_lvb lvb;
ENTRY;
- /* XXX phil: can we do this? won't it screw the file size up? */
- if ((fd && (fd->fd_flags & LL_FILE_IGNORE_LOCK)) ||
- (sbi->ll_flags & LL_SBI_NOLCK))
- RETURN(0);
+ inode_init_lvb(inode, &lvb);
+ obd_merge_lvb(sbi->ll_dt_exp, lli->lli_smd, &lvb, 0);
+ st->st_size = lvb.lvb_size;
+ st->st_blocks = lvb.lvb_blocks;
+ st->st_mtime = lvb.lvb_mtime;
+ st->st_atime = lvb.lvb_atime;
+ st->st_ctime = lvb.lvb_ctime;
+ EXIT;
+}
- rc = obd_cancel(&sbi->ll_osc_conn, lsm, mode, lockh);
+int llu_local_size(struct inode *inode)
+{
+ ldlm_policy_data_t policy = { .l_extent = { 0, OBD_OBJECT_EOF } };
+ struct llu_inode_info *lli = llu_i2info(inode);
+ struct llu_sb_info *sbi = llu_i2sbi(inode);
+ struct lustre_handle lockh = { 0 };
+ int flags = 0;
+ int rc;
+ ENTRY;
- RETURN(rc);
-#else
- return 0;
-#endif
+ if (lli->lli_smd->lsm_stripe_count == 0)
+ RETURN(0);
+
+ rc = obd_match(sbi->ll_dt_exp, lli->lli_smd, LDLM_EXTENT,
+ &policy, LCK_PR, &flags, inode, &lockh);
+ if (rc < 0)
+ RETURN(rc);
+ else if (rc == 0)
+ RETURN(-ENODATA);
+
+ llu_merge_lvb(inode);
+ obd_cancel(sbi->ll_dt_exp, lli->lli_smd, LCK_PR, &lockh);
+ RETURN(0);
}
-static int llu_brw(int cmd, struct inode *inode, struct page *page, int flags)
+/* NB: lov_merge_size will prefer locally cached writes if they extend the
+ * file (because it prefers KMS over RSS when larger) */
+int llu_glimpse_size(struct inode *inode)
{
struct llu_inode_info *lli = llu_i2info(inode);
- struct lov_stripe_md *lsm = lli->lli_smd;
- struct brw_page pg;
+ struct intnl_stat *st = llu_i2stat(inode);
+ struct llu_sb_info *sbi = llu_i2sbi(inode);
+ struct lustre_handle lockh = { 0 };
+ struct ldlm_enqueue_info einfo = { 0 };
+ struct obd_info oinfo = { { { 0 } } };
int rc;
ENTRY;
- pg.pg = page;
- pg.off = ((obd_off)page->index) << PAGE_SHIFT;
+ /* If size is cached on the mds, skip glimpse. */
+ if (lli->lli_flags & LLIF_MDS_SIZE_LOCK)
+ RETURN(0);
- /* FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME */
-#if 0
- if (cmd == OBD_BRW_WRITE && (pg.off + PAGE_SIZE > lli->lli_st_size))
- pg.count = lli->lli_st_size % PAGE_SIZE;
- else
-#endif
- pg.count = PAGE_SIZE;
+ CDEBUG(D_DLMTRACE, "Glimpsing inode "LPU64"\n", (__u64)st->st_ino);
- CDEBUG(D_PAGE, "%s %d bytes ino %lu at "LPU64"/"LPX64"\n",
- cmd & OBD_BRW_WRITE ? "write" : "read", pg.count, lli->lli_st_ino,
- pg.off, pg.off);
- if (pg.count == 0) {
- LBUG();
+ if (!lli->lli_smd) {
+ CDEBUG(D_DLMTRACE, "No objects for inode "LPU64"\n",
+ (__u64)st->st_ino);
+ RETURN(0);
}
- pg.flag = flags;
+ einfo.ei_type = LDLM_EXTENT;
+ einfo.ei_mode = LCK_PR;
+ einfo.ei_cb_bl = llu_extent_lock_callback;
+ einfo.ei_cb_cp = ldlm_completion_ast;
+ einfo.ei_cb_gl = llu_glimpse_callback;
+ einfo.ei_cbdata = inode;
- rc = obd_brw(cmd, llu_i2obdconn(inode), lsm, 1, &pg, set, NULL);
+ oinfo.oi_policy.l_extent.end = OBD_OBJECT_EOF;
+ oinfo.oi_lockh = &lockh;
+ oinfo.oi_md = lli->lli_smd;
+ oinfo.oi_flags = LDLM_FL_HAS_INTENT;
+
+ rc = obd_enqueue_rqset(sbi->ll_dt_exp, &oinfo, &einfo);
if (rc) {
- CERROR("error from obd_brw: rc = %d\n", rc);
+ CERROR("obd_enqueue returned rc %d, returning -EIO\n", rc);
+ RETURN(rc > 0 ? -EIO : rc);
}
+ llu_merge_lvb(inode);
+ CDEBUG(D_DLMTRACE, "glimpse: size: "LPU64", blocks: "LPU64"\n",
+ (__u64)st->st_size, (__u64)st->st_blocks);
+
RETURN(rc);
}
-static int llu_prepare_write(struct inode *inode, struct page *page,
- unsigned from, unsigned to)
+int llu_extent_lock(struct ll_file_data *fd, struct inode *inode,
+ struct lov_stripe_md *lsm, int mode,
+ ldlm_policy_data_t *policy, struct lustre_handle *lockh,
+ int ast_flags)
{
- struct llu_inode_info *lli = llu_i2info(inode);
- obd_off offset = ((obd_off)page->index) << PAGE_SHIFT;
- int rc = 0;
+ struct llu_sb_info *sbi = llu_i2sbi(inode);
+ struct intnl_stat *st = llu_i2stat(inode);
+ struct ldlm_enqueue_info einfo = { 0 };
+ struct obd_info oinfo = { { { 0 } } };
+ struct ost_lvb lvb;
+ int rc;
ENTRY;
-#if 0
- if (!PageLocked(page))
- LBUG();
+ LASSERT(!lustre_handle_is_used(lockh));
+ CLASSERT(ELDLM_OK == 0);
- if (PageUptodate(page))
+ /* XXX phil: can we do this? won't it screw the file size up? */
+ if ((fd && (fd->fd_flags & LL_FILE_IGNORE_LOCK)) ||
+ (sbi->ll_flags & LL_SBI_NOLCK) || mode == LCK_NL)
RETURN(0);
- //POISON(addr + from, 0xca, to - from);
-#endif
- /* We're completely overwriting an existing page, so _don't_ set it up
- * to date until commit_write */
- if (from == 0 && to == PAGE_SIZE)
+ CDEBUG(D_DLMTRACE, "Locking inode %llu, start "LPU64" end "LPU64"\n",
+ (__u64)st->st_ino, policy->l_extent.start,
+ policy->l_extent.end);
+
+ einfo.ei_type = LDLM_EXTENT;
+ einfo.ei_mode = mode;
+ einfo.ei_cb_bl = llu_extent_lock_callback;
+ einfo.ei_cb_cp = ldlm_completion_ast;
+ einfo.ei_cb_gl = llu_glimpse_callback;
+ einfo.ei_cbdata = inode;
+
+ oinfo.oi_policy = *policy;
+ oinfo.oi_lockh = lockh;
+ oinfo.oi_md = lsm;
+ oinfo.oi_flags = ast_flags;
+
+ rc = obd_enqueue(sbi->ll_dt_exp, &oinfo, &einfo, NULL);
+ *policy = oinfo.oi_policy;
+ if (rc > 0)
+ rc = -EIO;
+
+ inode_init_lvb(inode, &lvb);
+ obd_merge_lvb(sbi->ll_dt_exp, lsm, &lvb, 1);
+ if (policy->l_extent.start == 0 &&
+ policy->l_extent.end == OBD_OBJECT_EOF)
+ st->st_size = lvb.lvb_size;
+
+ if (rc == 0) {
+ st->st_mtime = lvb.lvb_mtime;
+ st->st_atime = lvb.lvb_atime;
+ st->st_ctime = lvb.lvb_ctime;
+ }
+
+ RETURN(rc);
+}
+
+int llu_extent_unlock(struct ll_file_data *fd, struct inode *inode,
+ struct lov_stripe_md *lsm, int mode,
+ struct lustre_handle *lockh)
+{
+ struct llu_sb_info *sbi = llu_i2sbi(inode);
+ int rc;
+ ENTRY;
+
+ CLASSERT(ELDLM_OK == 0);
+
+ /* XXX phil: can we do this? won't it screw the file size up? */
+ if ((fd && (fd->fd_flags & LL_FILE_IGNORE_LOCK)) ||
+ (sbi->ll_flags & LL_SBI_NOLCK) || mode == LCK_NL)
RETURN(0);
- /* If are writing to a new page, no need to read old data.
- * the extent locking and getattr procedures in ll_file_write have
- * guaranteed that i_size is stable enough for our zeroing needs */
- if (lli->lli_st_size <= offset) {
- memset(kmap(page), 0, PAGE_SIZE);
- kunmap(page);
- GOTO(prepare_done, rc = 0);
- }
+ rc = obd_cancel(sbi->ll_dt_exp, lsm, mode, lockh);
- rc = llu_brw(OBD_BRW_READ, inode, page, 0);
+ RETURN(rc);
+}
+#define LLAP_MAGIC 12346789
+
+struct ll_async_page {
+ int llap_magic;
+ void *llap_cookie;
+ int llap_queued;
+ struct page *llap_page;
+ struct inode *llap_inode;
+};
+
+static void llu_ap_fill_obdo(void *data, int cmd, struct obdo *oa)
+{
+ struct ll_async_page *llap;
+ struct inode *inode;
+ struct lov_stripe_md *lsm;
+ obd_flag valid_flags;
+ ENTRY;
+
+ llap = LLAP_FROM_COOKIE(data);
+ inode = llap->llap_inode;
+ lsm = llu_i2info(inode)->lli_smd;
+
+ oa->o_id = lsm->lsm_object_id;
+ oa->o_valid = OBD_MD_FLID;
+ valid_flags = OBD_MD_FLTYPE | OBD_MD_FLATIME;
+ if (cmd & OBD_BRW_WRITE)
+ 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);
EXIT;
+}
- prepare_done:
- return rc;
+static void llu_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_inode, valid);
+
+ EXIT;
}
-static int llu_commit_write(struct inode *inode, struct page *page,
- unsigned from, unsigned to)
+/* called for each page in a completed rpc.*/
+static int llu_ap_completion(void *data, int cmd, struct obdo *oa, int rc)
{
- struct llu_inode_info *lli = llu_i2info(inode);
- loff_t size;
- int rc;
+ struct ll_async_page *llap;
+ struct page *page;
ENTRY;
-#if 0
- 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);
- CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu,from=%d,to=%d\n",
- inode->i_ino, from, to);
- /* to match full page case in prepare_write */
- SetPageUptodate(page);
- /* mark the page dirty, put it on mapping->dirty,
- * mark the inode PAGES_DIRTY, put it on sb->dirty */
- set_page_dirty(page);
-#endif
- rc = llu_brw(OBD_BRW_WRITE, inode, page, 0);
- if (rc)
- return rc;
- /* this is matched by a hack in obdo_to_inode at the moment */
- size = (((obd_off)page->index) << PAGE_SHIFT) + to;
- if (size > lli->lli_st_size)
- lli->lli_st_size = size;
+ llap = LLAP_FROM_COOKIE(data);
+ llap->llap_queued = 0;
+ page = llap->llap_page;
+ if (rc != 0) {
+ if (cmd & OBD_BRW_WRITE)
+ CERROR("writeback error on page %p index %ld: %d\n",
+ page, page->index, rc);
+ }
RETURN(0);
-} /* ll_commit_write */
+}
+
+static struct obd_async_page_ops llu_async_page_ops = {
+ .ap_make_ready = NULL,
+ .ap_refresh_count = NULL,
+ .ap_fill_obdo = llu_ap_fill_obdo,
+ .ap_update_obdo = llu_ap_update_obdo,
+ .ap_completion = llu_ap_completion,
+};
-ssize_t
-llu_generic_file_write(struct inode *inode, const char *buf,
- size_t count, loff_t pos)
+static int llu_queue_pio(int cmd, struct llu_io_group *group,
+ char *buf, size_t count, loff_t pos)
{
- struct page *page;
- ssize_t written;
- long status = 0;
- int err;
- unsigned bytes;
-
- if ((ssize_t) count < 0)
- return -EINVAL;
-#if 0
- down(&inode->i_sem);
-#endif
- if (pos < 0)
- return -EINVAL;
+ struct llu_inode_info *lli = llu_i2info(group->lig_inode);
+ struct intnl_stat *st = llu_i2stat(group->lig_inode);
+ struct lov_stripe_md *lsm = lli->lli_smd;
+ struct obd_export *exp = llu_i2obdexp(group->lig_inode);
+ struct page *pages = &group->lig_pages[group->lig_npages],*page = pages;
+ struct ll_async_page *llap = &group->lig_llaps[group->lig_npages];
+ void *llap_cookie = group->lig_llap_cookies +
+ llap_cookie_size * group->lig_npages;
+ int i, rc, npages = 0, ret_bytes = 0;
+ int local_lock;
+ ENTRY;
- written = 0;
+ if (!exp)
+ RETURN(-EINVAL);
-#if 0
- remove_suid(inode);
- update_inode_times(inode);
-#endif
+ local_lock = group->lig_params->lrp_lock_mode != LCK_NL;
+ /* prepare the pages array */
do {
- unsigned long index, offset;
- char *kaddr;
-
- /*
- * Try to find the page in the cache. If it isn't there,
- * allocate a free page.
- */
- offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
- index = pos >> PAGE_CACHE_SHIFT;
- bytes = PAGE_CACHE_SIZE - offset;
- if (bytes > count) {
- bytes = count;
- }
-
- status = -ENOMEM; /* we'll assign it later anyway */
- page = __grab_cache_page(index);
- if (!page)
- break;
-
- kaddr = kmap(page);
- status = llu_prepare_write(inode, page, offset, offset+bytes);
- if (status)
- goto sync_failure;
-
- memcpy(kaddr+offset, buf, bytes);
-
- status = llu_commit_write(inode, page, offset, offset+bytes);
- if (!status)
- status = bytes;
-
- if (status >= 0) {
- written += status;
- count -= status;
- pos += status;
- buf += status;
- }
-unlock:
- kunmap(page);
- page_cache_release(page);
-
- if (status < 0)
- break;
- } while (count);
-done:
- err = written ? written : status;
-
-#if 0
- up(&inode->i_sem);
-#endif
- return err;
-
- status = -EFAULT;
- goto unlock;
-
-sync_failure:
- /*
- * If blocksize < pagesize, prepare_write() may have instantiated a
- * few blocks outside i_size. Trim these off again.
- */
- kunmap(page);
- page_cache_release(page);
- goto done;
+ unsigned long index, offset, bytes;
+
+ offset = (pos & ~CFS_PAGE_MASK);
+ index = pos >> CFS_PAGE_SHIFT;
+ bytes = CFS_PAGE_SIZE - offset;
+ if (bytes > count)
+ bytes = count;
+
+ /* prevent read beyond file range */
+ if (/* local_lock && */
+ cmd == OBD_BRW_READ && pos + bytes >= st->st_size) {
+ if (pos >= st->st_size)
+ break;
+ bytes = st->st_size - pos;
+ }
+
+ /* prepare page for this index */
+ page->index = index;
+ page->addr = buf - offset;
+
+ page->_offset = offset;
+ page->_count = bytes;
+
+ page++;
+ npages++;
+ count -= bytes;
+ pos += bytes;
+ buf += bytes;
+
+ group->lig_rwcount += bytes;
+ ret_bytes += bytes;
+ } while (count);
+
+ group->lig_npages += npages;
+
+ for (i = 0, page = pages; i < npages;
+ i++, page++, llap++, llap_cookie += llap_cookie_size){
+ llap->llap_magic = LLAP_MAGIC;
+ llap->llap_cookie = llap_cookie;
+ rc = obd_prep_async_page(exp, lsm, NULL, page,
+ (obd_off)page->index << CFS_PAGE_SHIFT,
+ &llu_async_page_ops,
+ llap, &llap->llap_cookie);
+ if (rc) {
+ LASSERT(rc < 0);
+ llap->llap_cookie = NULL;
+ RETURN(rc);
+ }
+ CDEBUG(D_CACHE, "llap %p page %p group %p obj off "LPU64"\n",
+ llap, page, llap->llap_cookie,
+ (obd_off)pages->index << CFS_PAGE_SHIFT);
+ page->private = (unsigned long)llap;
+ llap->llap_page = page;
+ llap->llap_inode = group->lig_inode;
+
+ rc = obd_queue_group_io(exp, lsm, NULL, group->lig_oig,
+ llap->llap_cookie, cmd,
+ page->_offset, page->_count,
+ group->lig_params->lrp_brw_flags,
+ ASYNC_READY | ASYNC_URGENT |
+ ASYNC_COUNT_STABLE | ASYNC_GROUP_SYNC);
+ if (!local_lock && cmd == OBD_BRW_READ) {
+ /*
+ * In OST-side locking case short reads cannot be
+ * detected properly.
+ *
+ * The root of the problem is that
+ *
+ * kms = lov_merge_size(lsm, 1);
+ * if (end >= kms)
+ * glimpse_size(inode);
+ * else
+ * st->st_size = kms;
+ *
+ * logic in the read code (both llite and liblustre)
+ * only works correctly when client holds DLM lock on
+ * [start, end]. Without DLM lock KMS can be
+ * completely out of date, and client can either make
+ * spurious short-read (missing concurrent write), or
+ * return stale data (missing concurrent
+ * truncate). For llite client this is fatal, because
+ * incorrect data are cached and can be later sent
+ * back to the server (vide bug 5047). This is hard to
+ * fix by handling short-reads on the server, as there
+ * is no easy way to communicate file size (or amount
+ * of bytes read/written) back to the client,
+ * _especially_ because OSC pages can be sliced and
+ * dices into multiple RPCs arbitrary. Fortunately,
+ * liblustre doesn't cache data and the worst case is
+ * that we get race with concurrent write or truncate.
+ */
+ }
+ if (rc) {
+ LASSERT(rc < 0);
+ RETURN(rc);
+ }
+
+ llap->llap_queued = 1;
+ }
+
+ RETURN(ret_bytes);
}
-ssize_t llu_file_write(struct inode *inode, const struct iovec *iovec,
- size_t iovlen, loff_t pos)
+static
+struct llu_io_group * get_io_group(struct inode *inode, int maxpages,
+ struct lustre_rw_params *params)
{
+ struct llu_io_group *group;
+ int rc;
+
+ if (!llap_cookie_size)
+ llap_cookie_size = obd_prep_async_page(llu_i2obdexp(inode),
+ NULL, NULL, NULL, 0,
+ NULL, NULL, NULL);
+
+ OBD_ALLOC(group, LLU_IO_GROUP_SIZE(maxpages));
+ if (!group)
+ return ERR_PTR(-ENOMEM);
+
+ I_REF(inode);
+ group->lig_inode = inode;
+ group->lig_maxpages = maxpages;
+ group->lig_params = params;
+ group->lig_llaps = (struct ll_async_page *)(group + 1);
+ group->lig_pages = (struct page *)(&group->lig_llaps[maxpages]);
+ group->lig_llap_cookies = (void *)(&group->lig_pages[maxpages]);
+
+ rc = oig_init(&group->lig_oig);
+ if (rc) {
+ OBD_FREE(group, LLU_IO_GROUP_SIZE(maxpages));
+ return ERR_PTR(rc);
+ }
+
+ return group;
+}
+
+static int max_io_pages(ssize_t len, int iovlen)
+{
+ return (((len + CFS_PAGE_SIZE -1) / CFS_PAGE_SIZE) + 2 + iovlen - 1);
+}
+
+static
+void put_io_group(struct llu_io_group *group)
+{
+ struct lov_stripe_md *lsm = llu_i2info(group->lig_inode)->lli_smd;
+ struct obd_export *exp = llu_i2obdexp(group->lig_inode);
+ struct ll_async_page *llap = group->lig_llaps;
+ int i;
+
+ for (i = 0; i < group->lig_npages; i++, llap++) {
+ if (llap->llap_cookie)
+ obd_teardown_async_page(exp, lsm, NULL,
+ llap->llap_cookie);
+ }
+
+ I_RELE(group->lig_inode);
+
+ oig_release(group->lig_oig);
+ OBD_FREE(group, LLU_IO_GROUP_SIZE(group->lig_maxpages));
+}
+
+static
+ssize_t llu_file_prwv(const struct iovec *iovec, int iovlen,
+ _SYSIO_OFF_T pos, ssize_t len,
+ void *private)
+{
+ struct llu_io_session *session = (struct llu_io_session *) private;
+ struct inode *inode = session->lis_inode;
struct llu_inode_info *lli = llu_i2info(inode);
- struct ll_file_data *fd = lli->lli_file_data; /* XXX not ready don't use it now */
- struct lustre_handle lockh = { 0 };
+ struct intnl_stat *st = llu_i2stat(inode);
+ struct ll_file_data *fd = lli->lli_file_data;
+ struct lustre_handle lockh = {0};
struct lov_stripe_md *lsm = lli->lli_smd;
- struct ldlm_extent extent;
- ldlm_error_t err;
- ssize_t retval = 0;
+ struct obd_export *exp = NULL;
+ struct llu_io_group *iogroup;
+ struct lustre_rw_params p;
+ struct ost_lvb lvb;
+ __u64 kms;
+ int err, is_read, iovidx, ret;
+ int local_lock;
+ ssize_t ret_len = len;
ENTRY;
- /* XXX consider other types later */
- if (!S_ISREG(lli->lli_st_mode))
- LBUG();
-#if 0
- CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu,size="LPSZ",offset=%Ld\n",
- inode->i_ino, count, *ppos);
-
- /*
- * sleep doing some writeback work of this mount's dirty data
- * if the VM thinks we're low on memory.. other dirtying code
- * paths should think about doing this, too, but they should be
- * careful not to hold locked pages while they do so. like
- * ll_prepare_write. *cough*
+ /* in a large iov read/write we'll be repeatedly called.
+ * so give a chance to answer cancel ast here
*/
- ll_check_dirty(inode->i_sb);
-#endif
- while (iovlen--) {
- const char *buf = iovec[iovlen].iov_base;
- size_t count = iovec[iovlen].iov_len;
+ liblustre_wait_event(0);
+
+ exp = llu_i2obdexp(inode);
+ if (exp == NULL)
+ RETURN(-EINVAL);
- /* POSIX, but surprised the VFS doesn't check this already */
- if (count == 0)
+ if (len == 0 || iovlen == 0)
+ RETURN(0);
+
+ if (pos + len > lli->lli_maxbytes)
+ RETURN(-ERANGE);
+
+ lustre_build_lock_params(session->lis_cmd, lli->lli_open_flags,
+ lli->lli_sbi->ll_lco.lco_flags,
+ pos, len, &p);
+
+ iogroup = get_io_group(inode, max_io_pages(len, iovlen), &p);
+ if (IS_ERR(iogroup))
+ RETURN(PTR_ERR(iogroup));
+
+ local_lock = p.lrp_lock_mode != LCK_NL;
+
+ err = llu_extent_lock(fd, inode, lsm, p.lrp_lock_mode, &p.lrp_policy,
+ &lockh, p.lrp_ast_flags);
+ if (err != ELDLM_OK)
+ GOTO(err_put, err);
+
+ is_read = (session->lis_cmd == OBD_BRW_READ);
+ if (is_read) {
+ /*
+ * If OST-side locking is used, KMS can be completely out of
+ * date, and, hence, cannot be used for short-read
+ * detection. Rely in OST to handle short reads in that case.
+ */
+ inode_init_lvb(inode, &lvb);
+ obd_merge_lvb(exp, lsm, &lvb, 1);
+ kms = lvb.lvb_size;
+ /* extent.end is last byte of the range */
+ if (p.lrp_policy.l_extent.end >= kms) {
+ /* A glimpse is necessary to determine whether
+ * we return a short read or some zeroes at
+ * the end of the buffer
+ *
+ * In the case of OST-side locking KMS can be
+ * completely out of date and short-reads maybe
+ * mishandled. See llu_queue_pio() for more detailed
+ * comment.
+ */
+ if ((err = llu_glimpse_size(inode))) {
+ GOTO(err_unlock, err);
+ }
+ } else {
+ st->st_size = kms;
+ }
+ } else if (lli->lli_open_flags & O_APPEND) {
+ pos = st->st_size;
+ }
+
+ for (iovidx = 0; iovidx < iovlen; iovidx++) {
+ char *buf = (char *) iovec[iovidx].iov_base;
+ size_t count = iovec[iovidx].iov_len;
+
+ if (!count)
continue;
+ if (len < count)
+ count = len;
+ if (IS_BAD_PTR(buf) || IS_BAD_PTR(buf + count)) {
+ GOTO(err_unlock, err = -EFAULT);
+ }
-#if 0
- if (!S_ISBLK(lli->lli_st_mode) && file->f_flags & O_APPEND) {
- extent.start = 0;
- extent.end = OBD_OBJECT_EOF;
- } else {
- extent.start = *ppos;
- extent.end = *ppos + count - 1;
+ if (is_read) {
+ if (/* local_lock && */ pos >= st->st_size)
+ break;
+ } else {
+ if (pos >= lli->lli_maxbytes) {
+ GOTO(err_unlock, err = -EFBIG);
+ }
+ if (pos + count >= lli->lli_maxbytes)
+ count = lli->lli_maxbytes - pos;
}
-#else
- extent.start = pos;
- extent.end = pos + count - 1;
-#endif
- err = llu_extent_lock(fd, inode, lsm, LCK_PW, &extent, &lockh);
- if (err != ELDLM_OK)
- RETURN(-ENOLCK);
+ ret = llu_queue_pio(session->lis_cmd, iogroup, buf, count, pos);
+ if (ret < 0) {
+ GOTO(err_unlock, err = ret);
+ } else {
+ pos += ret;
+ if (!is_read) {
+ LASSERT(ret == count);
+ obd_adjust_kms(exp, lsm, pos, 0);
+ /* file size grow immediately */
+ if (pos > st->st_size)
+ st->st_size = pos;
+ }
+ len -= ret;
+ if (!len)
+ break;
+ }
+ }
+ LASSERT(len == 0 || is_read); /* libsysio should guarantee this */
-#if 0
- if (!S_ISBLK(inode->i_mode) && file->f_flags & O_APPEND)
- *ppos = inode->i_size;
+ err = obd_trigger_group_io(exp, lsm, NULL, iogroup->lig_oig);
+ if (err)
+ GOTO(err_unlock, err);
- CDEBUG(D_INFO, "Writing inode %lu, "LPSZ" bytes, offset %Lu\n",
- inode->i_ino, count, *ppos);
-#endif
- retval += llu_generic_file_write(inode, buf, count, pos);
+ err = oig_wait(iogroup->lig_oig);
+ if (err) {
+ CERROR("sync error %d, data corruption possible\n", err);
+ GOTO(err_unlock, err);
}
- /* XXX errors? */
- ll_extent_unlock(fd, inode, lsm, LCK_PW, &lockh);
- return(retval);
-}
+ ret = llu_extent_unlock(fd, inode, lsm, p.lrp_lock_mode, &lockh);
+ if (ret)
+ CERROR("extent unlock error %d\n", ret);
-static void llu_update_atime(struct inode *inode)
-{
-#if 0
- struct llu_inode_info *lli = llu_i2info(inode);
+ session->lis_groups[session->lis_ngroups++] = iogroup;
+ RETURN(ret_len);
-#ifdef USE_ATIME
- struct iattr attr;
+err_unlock:
+ llu_extent_unlock(fd, inode, lsm, p.lrp_lock_mode, &lockh);
+err_put:
+ put_io_group(iogroup);
+ RETURN((ssize_t)err);
+}
- attr.ia_atime = LTIME_S(CURRENT_TIME);
- attr.ia_valid = ATTR_ATIME;
+static
+struct llu_io_session *get_io_session(struct inode *ino, int ngroups, int cmd)
+{
+ struct llu_io_session *session;
- if (lli->lli_st_atime == attr.ia_atime) return;
- if (IS_RDONLY(inode)) return;
- if (IS_NOATIME(inode)) return;
+ OBD_ALLOC(session, LLU_IO_SESSION_SIZE(ngroups));
+ if (!session)
+ return NULL;
- /* ll_inode_setattr() sets inode->i_atime from attr.ia_atime */
- llu_inode_setattr(inode, &attr, 0);
-#else
- /* update atime, but don't explicitly write it out just this change */
- inode->i_atime = CURRENT_TIME;
-#endif
-#endif
+ I_REF(ino);
+ session->lis_inode = ino;
+ session->lis_max_groups = ngroups;
+ session->lis_cmd = cmd;
+ return session;
}
-static size_t llu_generic_file_read(struct inode *inode, char *buf,
- size_t count, loff_t pos)
+static void put_io_session(struct llu_io_session *session)
{
- struct llu_inode_info *lli = llu_i2info(inode);
- unsigned long index, offset;
- int error = 0;
- size_t readed = 0;
-
- index = pos >> PAGE_CACHE_SHIFT;
- offset = pos & ~PAGE_CACHE_MASK;
+ int i;
- do {
- struct page *page;
- unsigned long end_index, nr;
-
- end_index = lli->lli_st_size >> PAGE_CACHE_SHIFT;
-
- if (index > end_index)
- break;
- nr = PAGE_CACHE_SIZE;
- if (index == end_index) {
- nr = lli->lli_st_size & ~PAGE_CACHE_MASK;
- if (nr <= offset)
- break;
- }
-
- nr = nr - offset;
- if (nr > count)
- nr = count;
-
- page = grab_cache_page(index);
- if (!page) {
- error = -ENOMEM;
- break;
+ for (i = 0; i < session->lis_ngroups; i++) {
+ if (session->lis_groups[i]) {
+ put_io_group(session->lis_groups[i]);
+ session->lis_groups[i] = NULL;
}
+ }
- error = llu_brw(OBD_BRW_READ, inode, page, 0);
- if (error) {
- page_cache_release(page);
- break;
- }
-
- memcpy(buf, kmap(page)+offset, nr);
- offset += nr;
- index += offset >> PAGE_CACHE_SHIFT;
- offset &= ~PAGE_CACHE_MASK;
- readed += nr;
- count -= nr;
-
- page_cache_release(page);
- } while (count);
-
- if (error)
- return error;
- return readed;
+ I_RELE(session->lis_inode);
+ OBD_FREE(session, LLU_IO_SESSION_SIZE(session->lis_max_groups));
}
-ssize_t llu_file_read(struct inode *inode, const struct iovec *iovec,
- size_t iovlen, loff_t pos)
+static int llu_file_rwx(struct inode *ino,
+ struct ioctx *ioctx,
+ int read)
{
- struct llu_inode_info *lli = llu_i2info(inode);
- struct ll_file_data *fd = lli->lli_file_data;
- struct lov_stripe_md *lsm = lli->lli_smd;
- struct lustre_handle lockh = { 0 };
-#if 0
- struct ll_read_extent rextent;
-#else
- struct ldlm_extent extent;
-#endif
- ldlm_error_t err;
- ssize_t retval = 0;
+ struct llu_io_session *session;
+ ssize_t cc;
+ int cmd = read ? OBD_BRW_READ : OBD_BRW_WRITE;
ENTRY;
- while (iovlen--) {
- char *buf = iovec[iovlen].iov_base;
- size_t count = iovec[iovlen].iov_len;
+ LASSERT(ioctx->ioctx_xtvlen >= 0);
+ LASSERT(ioctx->ioctx_iovlen >= 0);
- /* "If nbyte is 0, read() will return 0 and have no other results."
- * -- Single Unix Spec */
- if (count == 0)
- RETURN(0);
+ liblustre_wait_event(0);
-#if 0
- rextent.re_extent.start = pos;
- rextent.re_extent.end = pos + count - 1;
-#else
- extent.start = pos;
- extent.end = pos + count - 1;
-#endif
- err = llu_extent_lock(fd, inode, lsm, LCK_PR, &extent, &lockh);
- if (err != ELDLM_OK)
- RETURN(-ENOLCK);
-#if 0
- rextent.re_task = current;
- spin_lock(&lli->lli_read_extent_lock);
- list_add(&rextent.re_lli_item, &lli->lli_read_extents);
- spin_unlock(&lli->lli_read_extent_lock);
-#endif
- CDEBUG(D_INFO, "Reading inode %lu, "LPSZ" bytes, offset %Ld\n",
- lli->lli_st_ino, count, pos);
- retval = llu_generic_file_read(inode, buf, count, pos);
-#if 0
- spin_lock(&lli->lli_read_extent_lock);
- list_del(&rextent.re_lli_item);
- spin_unlock(&lli->lli_read_extent_lock);
-#endif
+ if (!ioctx->ioctx_xtvlen)
+ RETURN(0);
+
+ /* XXX consider other types later */
+ if (S_ISDIR(llu_i2stat(ino)->st_mode))
+ RETURN(-EISDIR);
+ if (!S_ISREG(llu_i2stat(ino)->st_mode))
+ RETURN(-EOPNOTSUPP);
+
+ session = get_io_session(ino, ioctx->ioctx_xtvlen * 2, cmd);
+ if (!session)
+ RETURN(-ENOMEM);
+
+ cc = _sysio_enumerate_extents(ioctx->ioctx_xtv, ioctx->ioctx_xtvlen,
+ ioctx->ioctx_iov, ioctx->ioctx_iovlen,
+ llu_file_prwv, session);
+
+ if (cc >= 0) {
+ LASSERT(!ioctx->ioctx_cc);
+ ioctx->ioctx_private = session;
+ cc = 0;
+ } else {
+ put_io_session(session);
}
- if (retval > 0)
- llu_update_atime(inode);
+ liblustre_wait_event(0);
+ RETURN(cc);
+}
+
+int llu_iop_read(struct inode *ino,
+ struct ioctx *ioctx)
+{
+ /* BUG: 5972 */
+ struct intnl_stat *st = llu_i2stat(ino);
+ st->st_atime = CURRENT_TIME;
+
+ return llu_file_rwx(ino, ioctx, 1);
+}
+
+int llu_iop_write(struct inode *ino,
+ struct ioctx *ioctx)
+{
+ struct intnl_stat *st = llu_i2stat(ino);
+ st->st_mtime = st->st_ctime = CURRENT_TIME;
- /* XXX errors? */
- ll_extent_unlock(fd, inode, lsm, LCK_PR, &lockh);
- RETURN(retval);
+ return llu_file_rwx(ino, ioctx, 0);
}
+int llu_iop_iodone(struct ioctx *ioctx)
+{
+ struct llu_io_session *session;
+ struct llu_io_group *group;
+ int i, err = 0, rc = 0;
+ ENTRY;
+
+ liblustre_wait_event(0);
+
+ session = (struct llu_io_session *) ioctx->ioctx_private;
+ LASSERT(session);
+ LASSERT(!IS_ERR(session));
+
+ for (i = 0; i < session->lis_ngroups; i++) {
+ group = session->lis_groups[i];
+ if (group) {
+ if (!rc) {
+ err = oig_wait(group->lig_oig);
+ if (err)
+ rc = err;
+ }
+ if (!rc)
+ ioctx->ioctx_cc += group->lig_rwcount;
+ put_io_group(group);
+ session->lis_groups[i] = NULL;
+ }
+ }
+
+ if (rc) {
+ LASSERT(rc < 0);
+ ioctx->ioctx_cc = -1;
+ ioctx->ioctx_errno = -rc;
+ }
+
+ put_io_session(session);
+ ioctx->ioctx_private = NULL;
+ liblustre_wait_event(0);
+
+ RETURN(1);
+}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff