/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 * Lustre Light block IO
 *
 *  Copyright (c) 2002-2004 Cluster File Systems, Inc.
 *
 *   This file is part of Lustre, http://www.lustre.org.
 *
 *   Lustre is free software; you can redistribute it and/or
 *   modify it under the terms of version 2 of the GNU General Public
 *   License as published by the Free Software Foundation.
 *
 *   Lustre is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with Lustre; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define DEBUG_SUBSYSTEM S_LLITE

#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <time.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <fcntl.h>
#include <sys/uio.h>

#include <fs.h>
#include <sysio.h>
#include <mount.h>
#include <inode.h>
#include <file.h>

#undef LIST_HEAD

#include "llite_lib.h"

struct llu_io_group
{
        struct obd_io_group    *lig_oig;
        struct inode           *lig_inode;
        int                     lig_maxpages;
        int                     lig_npages;
        __u64                   lig_rwcount;
        struct ll_async_page   *lig_llap;
        struct page            *lig_pages;
};

#define LLU_IO_GROUP_SIZE(x) \
        (sizeof(struct llu_io_group) + \
         sizeof(struct ll_async_page) * (x) + \
         sizeof(struct page) * (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);

static int llu_lock_to_stripe_offset(struct inode *inode, struct ldlm_lock *lock)
{
        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);
}

static int llu_extent_lock_callback(struct ldlm_lock *lock,
                                    struct ldlm_lock_desc *new, void *data,
                                    int flag)
{
        struct lustre_handle lockh = { 0 };
        int rc;
        ENTRY;

        if ((unsigned long)data > 0 && (unsigned long)data < 0x1000) {
                LDLM_ERROR(lock, "cancelling lock with bad data %p", data);
                LBUG();
        }

        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);

                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);
                l_lock(&lock->l_resource->lr_namespace->ns_lock);
                kms = ldlm_extent_shift_kms(lock,
                                            lsm->lsm_oinfo[stripe].loi_kms);
                l_unlock(&lock->l_resource->lr_namespace->ns_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();
        }

        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 rc, size = sizeof(*lvb), 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, 1, &size, NULL);
        if (rc) {
                CERROR("lustre_pack_reply: %d\n", rc);
                GOTO(iput, rc);
        }

        lvb = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*lvb));
        lvb->lvb_size = lli->lli_smd->lsm_oinfo[stripe].loi_kms;

        LDLM_DEBUG(lock, "i_size: %llu -> stripe number %u -> kms "LPU64,
                   lli->lli_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, 0, NULL, NULL);

        req->rq_status = rc;
        return rc;
}

__u64 lov_merge_size(struct lov_stripe_md *lsm, int kms_only);
__u64 lov_merge_blocks(struct lov_stripe_md *lsm);
__u64 lov_merge_mtime(struct lov_stripe_md *lsm, __u64 current_time);

/* 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 llu_sb_info *sbi = llu_i2sbi(inode);
        ldlm_policy_data_t policy = { .l_extent = { 0, OBD_OBJECT_EOF } };
        struct lustre_handle lockh = { 0 };
        int rc, flags = LDLM_FL_HAS_INTENT;
        ENTRY;

        CDEBUG(D_DLMTRACE, "Glimpsing inode %lu\n", lli->lli_st_ino);

        rc = obd_enqueue(sbi->ll_lov_exp, lli->lli_smd, LDLM_EXTENT, &policy,
                         LCK_PR, &flags, llu_extent_lock_callback,
                         ldlm_completion_ast, llu_glimpse_callback, inode,
                         sizeof(struct ost_lvb), lustre_swab_ost_lvb, &lockh);
        if (rc) {
                CERROR("obd_enqueue returned rc %d, returning -EIO\n", rc);
                RETURN(rc > 0 ? -EIO : rc);
        }

        lli->lli_st_size = lov_merge_size(lli->lli_smd, 0);
        lli->lli_st_blocks = lov_merge_blocks(lli->lli_smd);
        //lli->lli_st_mtime = lov_merge_mtime(lli->lli_smd, inode->i_mtime);

        CDEBUG(D_DLMTRACE, "glimpse: size: %llu, blocks: %lu\n",
               lli->lli_st_size, lli->lli_st_blocks);

        obd_cancel(sbi->ll_lov_exp, lli->lli_smd, LCK_PR, &lockh);

        RETURN(rc);
}

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_sb_info *sbi = llu_i2sbi(inode);
        struct llu_inode_info *lli = llu_i2info(inode);
        int rc;
        ENTRY;

        LASSERT(lockh->cookie == 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))
                RETURN(0);

        CDEBUG(D_DLMTRACE, "Locking inode %lu, start "LPU64" end "LPU64"\n",
               lli->lli_st_ino, policy->l_extent.start, policy->l_extent.end);

        rc = obd_enqueue(sbi->ll_lov_exp, lsm, LDLM_EXTENT, policy, mode,
                         &ast_flags, llu_extent_lock_callback,
                         ldlm_completion_ast, llu_glimpse_callback, inode,
                         sizeof(struct ost_lvb), lustre_swab_ost_lvb, lockh);
        if (rc > 0)
                rc = -EIO;

        if (policy->l_extent.start == 0 &&
            policy->l_extent.end == OBD_OBJECT_EOF)
                lli->lli_st_size = lov_merge_size(lsm, 1);

        //inode->i_mtime = lov_merge_mtime(lsm, inode->i_mtime);

        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;

        /* 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);

        rc = obd_cancel(sbi->ll_lov_exp, lsm, mode, lockh);

        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 struct ll_async_page *llap_from_cookie(void *cookie)
{
        struct ll_async_page *llap = cookie;
        if (llap->llap_magic != LLAP_MAGIC)
                return ERR_PTR(-EINVAL);
        return llap;
};

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_valid valid_flags;
        ENTRY;

        llap = llap_from_cookie(data);
        if (IS_ERR(llap)) {
                EXIT;
                return;
        }

        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;

        obdo_from_inode(oa, inode, valid_flags);
        EXIT;
}

/* called for each page in a completed rpc.*/
static void llu_ap_completion(void *data, int cmd, struct obdo *oa, int rc)
{
        struct ll_async_page *llap;
        struct page *page;

        llap = llap_from_cookie(data);
        if (IS_ERR(llap)) {
                EXIT;
                return;
        }

        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);
        }
        EXIT;
}

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_completion =        llu_ap_completion,
};

static int llu_queue_pio(int cmd, struct llu_io_group *group,
                         char *buf, size_t count, loff_t pos)
{
        struct llu_inode_info *lli = llu_i2info(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];
        struct ll_async_page *llap = &group->lig_llap[group->lig_npages];
        int i, rc, npages = 0, ret_bytes = 0;
        ENTRY;

        if (!exp)
                RETURN(-EINVAL);

        /* prepare the pages array */
	do {
                unsigned long index, offset, bytes;

                offset = (pos & ~PAGE_CACHE_MASK);
                index = pos >> PAGE_CACHE_SHIFT;
                bytes = PAGE_CACHE_SIZE - offset;
                if (bytes > count)
                        bytes = count;

                /* prevent read beyond file range */
                if ((cmd == OBD_BRW_READ) &&
                    (pos + bytes) >= lli->lli_st_size) {
                        if (pos >= lli->lli_st_size)
                                break;
                        bytes = lli->lli_st_size - pos;
                }

                /* prepare page for this index */
                pages[npages].index = index;
                pages[npages].addr = buf - offset;

                pages[npages]._offset = offset;
                pages[npages]._count = bytes;

                npages++;
                count -= bytes;
                pos += bytes;
                buf += bytes;

                group->lig_rwcount += bytes;
                ret_bytes += bytes;
        } while (count);

        group->lig_npages += npages;

        for (i = 0; i < npages; i++) {
                llap[i].llap_magic = LLAP_MAGIC;
                rc = obd_prep_async_page(exp, lsm, NULL, &pages[i],
                                         (obd_off)pages[i].index << PAGE_SHIFT,
                                         &llu_async_page_ops,
                                         &llap[i], &llap[i].llap_cookie);
                if (rc) {
                        LASSERT(rc < 0);
                        llap[i].llap_cookie = NULL;
                        RETURN(rc);
                }
                CDEBUG(D_CACHE, "llap %p page %p group %p obj off "LPU64"\n",
                       &llap[i], &pages[i], llap[i].llap_cookie,
                       (obd_off)pages[i].index << PAGE_SHIFT);
                pages[i].private = (unsigned long)&llap[i];
                llap[i].llap_page = &pages[i];
                llap[i].llap_inode = group->lig_inode;

                rc = obd_queue_group_io(exp, lsm, NULL, group->lig_oig,
                                        llap[i].llap_cookie, cmd,
                                        pages[i]._offset, pages[i]._count, 0,
                                        ASYNC_READY | ASYNC_URGENT |
                                        ASYNC_COUNT_STABLE | ASYNC_GROUP_SYNC);
                if (rc) {
                        LASSERT(rc < 0);
                        RETURN(rc);
                }

                llap[i].llap_queued = 1;
        }

        RETURN(ret_bytes);
}

static
struct llu_io_group * get_io_group(struct inode *inode, int maxpages)
{
        struct llu_io_group *group;
        int rc;

        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_llap = (struct ll_async_page *)(group + 1);
        group->lig_pages = (struct page *) (group->lig_llap + 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 + PAGE_SIZE -1) / 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_llap;
        int i;

        for (i = 0; i< group->lig_npages; i++) {
                if (llap[i].llap_cookie)
                        obd_teardown_async_page(exp, lsm, NULL,
                                                llap[i].llap_cookie);
        }

        I_RELE(group->lig_inode);

        oig_release(group->lig_oig);
        OBD_FREE(group, LLU_IO_GROUP_SIZE(group->lig_maxpages));
}

void lov_increase_kms(struct obd_export *exp, struct lov_stripe_md *lsm,
                      obd_off size);

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;
        struct lustre_handle lockh = {0};
        struct lov_stripe_md *lsm = lli->lli_smd;
        struct obd_export *exp = NULL;
        ldlm_policy_data_t policy;
        struct llu_io_group *iogroup;
        int astflag = (lli->lli_open_flags & O_NONBLOCK) ?
                       LDLM_FL_BLOCK_NOWAIT : 0;
        __u64 kms;
        int err, is_read, lock_mode, iovidx, ret;
        ENTRY;

        /* in a large iov read/write we'll be repeatedly called.
         * so give a chance to answer cancel ast here
         */
        liblustre_wait_event(0);

        exp = llu_i2obdexp(inode);
        if (exp == NULL)
                RETURN(-EINVAL);

        if (len == 0 || iovlen == 0)
                RETURN(0);

        if (pos + len > lli->lli_maxbytes)
                RETURN(-ERANGE);

        iogroup = get_io_group(inode, max_io_pages(len, iovlen));
        if (IS_ERR(iogroup))
                RETURN(PTR_ERR(iogroup));

        is_read = session->lis_cmd == OBD_BRW_READ;
        lock_mode = is_read ? LCK_PR : LCK_PW;

        if (!is_read && (lli->lli_open_flags & O_APPEND)) {
                policy.l_extent.start = 0;
                policy.l_extent.end = OBD_OBJECT_EOF;
        } else {
                policy.l_extent.start = pos;
                policy.l_extent.end = pos + len - 1;
        }

        err = llu_extent_lock(fd, inode, lsm, lock_mode, &policy,
                              &lockh, astflag);
        if (err != ELDLM_OK)
                GOTO(err_put, err);

        if (is_read) {
                kms = lov_merge_size(lsm, 1);
                if (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 */
                        if ((err = llu_glimpse_size(inode))) {
                                llu_extent_unlock(fd, inode, lsm,
                                                  lock_mode, &lockh);
                                GOTO(err_put, err);
                        }
                } else {
                        lli->lli_st_size = kms;
                }
        } else {
                if (lli->lli_open_flags & O_APPEND)
                        pos = lli->lli_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)) {
                        llu_extent_unlock(fd, inode, lsm, lock_mode, &lockh);
                        GOTO(err_put, err = -EFAULT);
                }

                if (is_read) {
                        if (pos >= lli->lli_st_size)
                                break;
                } else {
                        if (pos >= lli->lli_maxbytes) {
                                llu_extent_unlock(fd, inode, lsm, lock_mode,
                                                  &lockh);
                                GOTO(err_put, err = -EFBIG);
                        }
                        if (pos + count >= lli->lli_maxbytes)
                                count = lli->lli_maxbytes - pos;
                }

                ret = llu_queue_pio(session->lis_cmd, iogroup, buf, count, pos);
                if (ret < 0) {
                        llu_extent_unlock(fd, inode, lsm, lock_mode, &lockh);
                        GOTO(err_put, err = ret);
                } else {
                        pos += ret;
                        if (!is_read) {
                                LASSERT(ret == count);
                                lov_increase_kms(exp, lsm, pos);
                                /* file size grow immediately */
                                if (pos > lli->lli_st_size)
                                        lli->lli_st_size = pos;
                        }
                        len -= ret;
                        if (!len)
                                break;
                }
        }
        LASSERT(len == 0 || is_read); /* libsysio should guarantee this */

        err = llu_extent_unlock(fd, inode, lsm, lock_mode, &lockh);
        if (err)
                CERROR("extent unlock error %d\n", err);

        err = obd_trigger_group_io(exp, lsm, NULL, iogroup->lig_oig);
        if (err)
                GOTO(err_put, err);

        session->lis_groups[session->lis_ngroups++] = iogroup;
        RETURN(0);
err_put:
        put_io_group(iogroup);
        RETURN((ssize_t)err);
}

static
struct llu_io_session *get_io_session(struct inode *ino, int ngroups, int cmd)
{
        struct llu_io_session *session;

        OBD_ALLOC(session, LLU_IO_SESSION_SIZE(ngroups));
        if (!session)
                return NULL;

        I_REF(ino);
        session->lis_inode = ino;
        session->lis_max_groups = ngroups;
        session->lis_cmd = cmd;
        return session;
}

static void put_io_session(struct llu_io_session *session)
{
        int i;

        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;
                }
        }

        I_RELE(session->lis_inode);
        OBD_FREE(session, LLU_IO_SESSION_SIZE(session->lis_max_groups));
}

static int llu_file_rwx(struct inode *ino,
                        struct ioctx *ioctx,
                        int read)
{
        struct llu_io_session *session;
        ssize_t cc;
        int cmd = read ? OBD_BRW_READ : OBD_BRW_WRITE;
        ENTRY;

        LASSERT(ioctx->ioctx_xtvlen >= 0);
        LASSERT(ioctx->ioctx_iovlen >= 0);

        liblustre_wait_event(0);

        if (!ioctx->ioctx_xtvlen)
                RETURN(0);

        /* XXX consider other types later */
        LASSERT(S_ISREG(llu_i2info(ino)->lli_st_mode));

        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;
                RETURN(0);
        } else {
                put_io_session(session);
                RETURN(cc);
        }
}

int llu_iop_read(struct inode *ino,
                 struct ioctx *ioctx)
{
        return llu_file_rwx(ino, ioctx, 1);
}

int llu_iop_write(struct inode *ino,
                  struct ioctx *ioctx)
{
        struct iattr iattr;
        int rc;

        memset(&iattr, 0, sizeof(iattr));
        iattr.ia_mtime = iattr.ia_atime = CURRENT_TIME;
        iattr.ia_valid = ATTR_MTIME | ATTR_ATIME | ATTR_RAW;

        liblustre_wait_event(0);
        rc = llu_setattr_raw(ino, &iattr);
        if (rc) {
                CERROR("failed to set mtime/atime during write: %d", rc);
                /* XXX should continue or return error? */
        }

        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;

        RETURN(1);
}