Viewing: lmv_intent.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2016, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*/
#define DEBUG_SUBSYSTEM S_LMV
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/math64.h>
#include <linux/seq_file.h>
#include <linux/namei.h>
#include <uapi/linux/lustre/lustre_user.h>
#include <obd_support.h>
#include <lustre_lib.h>
#include <lustre_net.h>
#include <lustre_dlm.h>
#include <lustre_mdc.h>
#include <obd_class.h>
#include <lprocfs_status.h>
#include "lmv_internal.h"
static int lmv_intent_remote(struct obd_export *exp, struct lookup_intent *it,
const struct lu_fid *parent_fid,
struct ptlrpc_request **reqp,
ldlm_blocking_callback cb_blocking,
__u64 extra_lock_flags, __u32 *suppgids,
const char *secctx_name, __u32 secctx_name_size)
{
struct obd_device *obd = exp->exp_obd;
struct lmv_obd *lmv = &obd->u.lmv;
struct ptlrpc_request *req = NULL;
struct lustre_handle plock;
struct md_op_data *op_data;
struct lmv_tgt_desc *tgt;
struct mdt_body *body;
int pmode;
int rc = 0;
ENTRY;
body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
if (body == NULL)
RETURN(-EPROTO);
LASSERT((body->mbo_valid & OBD_MD_MDS));
/*
* We got LOOKUP lock, but we really need attrs.
*/
pmode = it->it_lock_mode;
if (pmode) {
plock.cookie = it->it_lock_handle;
it->it_lock_mode = 0;
it->it_request = NULL;
}
LASSERT(fid_is_sane(&body->mbo_fid1));
tgt = lmv_fid2tgt(lmv, &body->mbo_fid1);
if (IS_ERR(tgt))
GOTO(out, rc = PTR_ERR(tgt));
OBD_ALLOC_PTR(op_data);
if (op_data == NULL)
GOTO(out, rc = -ENOMEM);
op_data->op_fid1 = body->mbo_fid1;
/* Sent the parent FID to the remote MDT */
if (parent_fid != NULL) {
/* The parent fid is only for remote open to
* check whether the open is from OBF,
* see mdt_cross_open */
LASSERT(it->it_op & IT_OPEN);
op_data->op_fid2 = *parent_fid;
}
op_data->op_bias = MDS_CROSS_REF;
op_data->op_cli_flags = CLI_NO_SLOT;
CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%u\n",
PFID(&body->mbo_fid1), tgt->ltd_index);
/* ask for security context upon intent */
if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_OPEN) &&
secctx_name_size != 0 && secctx_name != NULL) {
op_data->op_file_secctx_name = secctx_name;
op_data->op_file_secctx_name_size = secctx_name_size;
CDEBUG(D_SEC, "'%.*s' is security xattr to fetch for "
DFID"\n",
secctx_name_size, secctx_name, PFID(&body->mbo_fid1));
}
/* add suppgids from client */
if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_OPEN) && suppgids) {
op_data->op_suppgids[0] = suppgids[0];
op_data->op_suppgids[1] = suppgids[1];
} else {
op_data->op_suppgids[0] = -1;
op_data->op_suppgids[1] = -1;
}
rc = md_intent_lock(tgt->ltd_exp, op_data, it, &req, cb_blocking,
extra_lock_flags);
if (rc)
GOTO(out_free_op_data, rc);
/*
* LLite needs LOOKUP lock to track dentry revocation in order to
* maintain dcache consistency. Thus drop UPDATE|PERM lock here
* and put LOOKUP in request.
*/
if (it->it_lock_mode != 0) {
it->it_remote_lock_handle =
it->it_lock_handle;
it->it_remote_lock_mode = it->it_lock_mode;
}
if (pmode) {
it->it_lock_handle = plock.cookie;
it->it_lock_mode = pmode;
}
EXIT;
out_free_op_data:
OBD_FREE_PTR(op_data);
out:
if (rc && pmode)
ldlm_lock_decref(&plock, pmode);
ptlrpc_req_put(*reqp);
*reqp = req;
return rc;
}
int lmv_revalidate_slaves(struct obd_export *exp,
const struct lmv_stripe_md *lsm,
ldlm_blocking_callback cb_blocking,
int extra_lock_flags, __u32 *suppgids)
{
struct obd_device *obd = exp->exp_obd;
struct lmv_obd *lmv = &obd->u.lmv;
struct ptlrpc_request *req = NULL;
struct mdt_body *body;
struct md_op_data *op_data;
int i;
int valid_stripe_count = 0;
int rc = 0;
ENTRY;
/**
* revalidate slaves has some problems, temporarily return,
* we may not need that
*/
OBD_ALLOC_PTR(op_data);
if (op_data == NULL)
RETURN(-ENOMEM);
/**
* Loop over the stripe information, check validity and update them
* from MDS if needed.
*/
for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
struct lu_fid fid;
struct lookup_intent it = { .it_op = IT_GETATTR };
struct lustre_handle *lockh = NULL;
struct lmv_tgt_desc *tgt = NULL;
struct inode *inode;
fid = lsm->lsm_md_oinfo[i].lmo_fid;
inode = lsm->lsm_md_oinfo[i].lmo_root;
if (!inode)
continue;
/*
* Prepare op_data for revalidating. Note that @fid2 shluld be
* defined otherwise it will go to server and take new lock
* which is not needed here.
*/
memset(op_data, 0, sizeof(*op_data));
op_data->op_fid1 = fid;
op_data->op_fid2 = fid;
/* shard revalidate only needs to fetch attributes and UPDATE
* lock, which is similar to the bottom half of remote object
* getattr, set this flag so that MDT skips checking whether
* it's remote object.
*/
op_data->op_bias = MDS_CROSS_REF;
op_data->op_cli_flags = CLI_NO_SLOT;
if (suppgids) {
op_data->op_suppgids[0] = suppgids[0];
op_data->op_suppgids[1] = suppgids[1];
} else {
op_data->op_suppgids[0] = -1;
op_data->op_suppgids[1] = -1;
}
tgt = lmv_tgt_retry(lmv, lsm->lsm_md_oinfo[i].lmo_mds);
if (!tgt)
GOTO(cleanup, rc = -ENODEV);
CDEBUG(D_INODE, "Revalidate slave "DFID" -> mds #%u\n",
PFID(&fid), tgt->ltd_index);
if (req != NULL) {
ptlrpc_req_put(req);
req = NULL;
}
rc = md_intent_lock(tgt->ltd_exp, op_data, &it, &req,
cb_blocking, extra_lock_flags);
if (rc == -ENOENT || rc == -ESHUTDOWN) {
/* skip stripe that doesn't exist or is inaccessible */
rc = 0;
continue;
}
if (rc < 0)
GOTO(cleanup, rc);
lockh = (struct lustre_handle *)&it.it_lock_handle;
if (rc > 0 && req == NULL) {
/* slave inode is still valid */
CDEBUG(D_INODE, "slave "DFID" is still valid.\n",
PFID(&fid));
rc = 0;
} else {
/* refresh slave from server */
body = req_capsule_server_get(&req->rq_pill,
&RMF_MDT_BODY);
if (body == NULL) {
if (it.it_lock_mode && lockh) {
ldlm_lock_decref(lockh,
it.it_lock_mode);
it.it_lock_mode = 0;
}
GOTO(cleanup, rc = -ENOENT);
}
i_size_write(inode, body->mbo_size);
inode->i_blocks = body->mbo_blocks;
spin_lock(&inode->i_lock);
set_nlink(inode, body->mbo_nlink);
spin_unlock(&inode->i_lock);
inode_set_atime(inode, body->mbo_atime, 0);
inode_set_ctime(inode, body->mbo_ctime, 0);
inode_set_mtime(inode, body->mbo_mtime, 0);
}
md_set_lock_data(tgt->ltd_exp, lockh, inode, NULL);
if (it.it_lock_mode != 0 && lockh != NULL) {
ldlm_lock_decref(lockh, it.it_lock_mode);
it.it_lock_mode = 0;
}
valid_stripe_count++;
}
cleanup:
if (req != NULL)
ptlrpc_req_put(req);
/* if all stripes are invalid, return -ENOENT to notify user */
if (!rc && !valid_stripe_count)
rc = -ENOENT;
OBD_FREE_PTR(op_data);
RETURN(rc);
}
/*
* IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
* may be split dir.
*/
static int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
struct lookup_intent *it,
struct ptlrpc_request **reqp,
ldlm_blocking_callback cb_blocking,
__u64 extra_lock_flags)
{
enum mds_open_flags flags = it->it_open_flags;
struct obd_device *obd = exp->exp_obd;
struct lmv_obd *lmv = &obd->u.lmv;
struct lmv_tgt_desc *tgt;
struct mdt_body *body;
int rc;
ENTRY;
/* do not allow file creation in foreign dir */
if ((it->it_op & IT_CREAT) && lmv_dir_foreign(op_data->op_lso1))
RETURN(-ENODATA);
if ((it->it_op & IT_CREAT) && !(flags & MDS_OPEN_BY_FID)) {
/* don't allow create under dir with bad hash */
if (lmv_dir_bad_hash(op_data->op_lso1))
RETURN(-EBADF);
if (lmv_dir_layout_changing(op_data->op_lso1)) {
if (flags & O_EXCL) {
/*
* open(O_CREAT | O_EXCL) needs to check
* existing name, which should be done on both
* old and new layout, check old layout on
* client side.
*/
rc = lmv_old_layout_lookup(lmv, op_data);
if (rc != -ENOENT)
RETURN(rc);
op_data->op_new_layout = true;
} else {
/*
* open(O_CREAT) will be sent to MDT in old
* layout first, to avoid creating new file
* under old layout, clear O_CREAT.
*/
it->it_open_flags &= ~MDS_OPEN_CREAT;
}
}
}
retry:
if (it->it_open_flags & MDS_OPEN_BY_FID) {
LASSERT(fid_is_sane(&op_data->op_fid2));
/* for striped directory, we can't know parent stripe fid
* without name, but we can set it to child fid, and MDT
* will obtain it from linkea in open in such case. */
if (lmv_dir_striped(op_data->op_lso1))
op_data->op_fid1 = op_data->op_fid2;
tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
if (IS_ERR(tgt))
RETURN(PTR_ERR(tgt));
op_data->op_mds = tgt->ltd_index;
} else {
LASSERT(fid_is_sane(&op_data->op_fid1));
LASSERT(fid_is_zero(&op_data->op_fid2));
LASSERT(op_data->op_name != NULL);
tgt = lmv_locate_tgt_create(obd, lmv, op_data);
if (IS_ERR(tgt))
RETURN(PTR_ERR(tgt));
}
/* If it is ready to open the file by FID, do not need
* allocate FID at all, otherwise it will confuse MDT */
if ((it->it_op & IT_CREAT) && !(it->it_open_flags & MDS_OPEN_BY_FID)) {
/*
* For lookup(IT_CREATE) cases allocate new fid and setup FLD
* for it.
*/
rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
if (rc != 0)
RETURN(rc);
}
if (lmv_dir_striped(op_data->op_lso1))
op_data->op_layout_version =
op_data->op_lso1->lso_lsm.lsm_md_layout_version;
else
op_data->op_layout_version = 1;
CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID", name='"
DNAME"' -> mds #%u layout version %u\n",
PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
encode_fn_opdata(op_data), tgt->ltd_index,
op_data->op_layout_version);
rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
extra_lock_flags);
if (rc != 0)
RETURN(rc);
/*
* Nothing is found, do not access body->fid1 as it is zero and thus
* pointless.
*/
if (it_disposition(it, DISP_LOOKUP_NEG) &&
!it_disposition(it, DISP_OPEN_CREATE) &&
!it_disposition(it, DISP_OPEN_OPEN)) {
if (!(it->it_open_flags & MDS_OPEN_BY_FID) &&
lmv_dir_retry_check_update(op_data)) {
ptlrpc_req_put(*reqp);
it->it_request = NULL;
it_clear_disposition(it, DISP_ALL);
*reqp = NULL;
it->it_open_flags = flags;
fid_zero(&op_data->op_fid2);
goto retry;
}
RETURN(rc);
}
body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
if (body == NULL)
RETURN(-EPROTO);
/* Not cross-ref case, just get out of here. */
if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
rc = lmv_intent_remote(exp, it, &op_data->op_fid1, reqp,
cb_blocking, extra_lock_flags,
op_data->op_suppgids,
op_data->op_file_secctx_name,
op_data->op_file_secctx_name_size);
if (rc != 0)
RETURN(rc);
body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
if (body == NULL)
RETURN(-EPROTO);
}
RETURN(rc);
}
/*
* Handler for: getattr, lookup and revalidate cases.
*/
static int
lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
struct lookup_intent *it, struct ptlrpc_request **reqp,
ldlm_blocking_callback cb_blocking,
__u64 extra_lock_flags)
{
struct obd_device *obd = exp->exp_obd;
struct lmv_obd *lmv = &obd->u.lmv;
struct lmv_tgt_desc *tgt = NULL;
struct mdt_body *body;
int rc;
ENTRY;
/* foreign dir is not striped */
if (lmv_dir_foreign(op_data->op_lso1)) {
/* only allow getattr/lookup for itself */
if (op_data->op_name != NULL)
RETURN(-ENODATA);
RETURN(0);
}
retry:
if (op_data->op_flags & MF_GETATTR_BY_FID) {
/* getattr by FID, replace fid1 with stripe FID,
* NB, don't replace if name is "/", because it may be a subtree
* mount, and if it's a striped directory, fid1 will be replaced
* to stripe FID by hash, while fid2 is master object FID, which
* will be treated as a remote object if the two FIDs are
* located on different MDTs, and LOOKUP lock can't be fetched.
*/
LASSERT(op_data->op_name);
if (op_data->op_namelen != 1 ||
strncmp(op_data->op_name, "/", 1) != 0) {
tgt = lmv_locate_tgt(lmv, op_data);
if (IS_ERR(tgt))
RETURN(PTR_ERR(tgt));
}
/* name is used to locate stripe target, clear it here
* to avoid packing name in request, so that MDS knows
* it's getattr by FID.
*/
op_data->op_name = NULL;
op_data->op_namelen = 0;
/* getattr request is sent to MDT where fid2 inode is */
tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
} else if (op_data->op_name) {
/* getattr by name */
tgt = lmv_locate_tgt(lmv, op_data);
if (!fid_is_sane(&op_data->op_fid2))
fid_zero(&op_data->op_fid2);
} else {
/* old way to getattr by FID, parent FID not packed */
tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
}
if (IS_ERR(tgt))
RETURN(PTR_ERR(tgt));
CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
", name='%s' -> mds #%u\n",
PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
op_data->op_name ?
encode_fn_len(op_data->op_name, op_data->op_namelen) :
"<NULL>", tgt->ltd_index);
op_data->op_bias &= ~MDS_CROSS_REF;
rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
extra_lock_flags);
if (rc < 0)
RETURN(rc);
if (*reqp == NULL) {
/* If RPC happens, lsm information will be revalidated
* during update_inode process (see ll_update_lsm_md) */
if (lmv_dir_striped(op_data->op_lso2)) {
rc = lmv_revalidate_slaves(exp,
&op_data->op_lso2->lso_lsm,
cb_blocking,
extra_lock_flags,
op_data->op_suppgids);
if (rc != 0)
RETURN(rc);
}
RETURN(rc);
} else if (it_disposition(it, DISP_LOOKUP_NEG) &&
lmv_dir_retry_check_update(op_data)) {
ptlrpc_req_put(*reqp);
it->it_request = NULL;
it_clear_disposition(it, DISP_ALL);
*reqp = NULL;
goto retry;
}
if (!it_has_reply_body(it))
RETURN(0);
/*
* MDS has returned success. Probably name has been resolved in
* remote inode. Let's check this.
*/
body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
if (body == NULL)
RETURN(-EPROTO);
/* Not cross-ref case, just get out of here. */
if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
rc = lmv_intent_remote(exp, it, NULL, reqp, cb_blocking,
extra_lock_flags, op_data->op_suppgids,
op_data->op_file_secctx_name,
op_data->op_file_secctx_name_size);
if (rc != 0)
RETURN(rc);
body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
if (body == NULL)
RETURN(-EPROTO);
}
RETURN(rc);
}
int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
struct lookup_intent *it, struct ptlrpc_request **reqp,
ldlm_blocking_callback cb_blocking,
__u64 extra_lock_flags)
{
int rc = 0;
ENTRY;
LASSERT(it != NULL);
LASSERT(fid_is_sane(&op_data->op_fid1));
CDEBUG(D_INODE, "INTENT LOCK '%s' for "DFID" '"DNAME"' on "DFID"\n",
LL_IT2STR(it), PFID(&op_data->op_fid2),
encode_fn_opdata(op_data), PFID(&op_data->op_fid1));
if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT | IT_GETXATTR))
rc = lmv_intent_lookup(exp, op_data, it, reqp, cb_blocking,
extra_lock_flags);
else if (it->it_op & (IT_OPEN | IT_CREAT))
rc = lmv_intent_open(exp, op_data, it, reqp, cb_blocking,
extra_lock_flags);
else
LBUG();
if (rc < 0) {
struct lustre_handle lock_handle;
if (it->it_lock_mode != 0) {
lock_handle.cookie = it->it_lock_handle;
ldlm_lock_decref_and_cancel(&lock_handle,
it->it_lock_mode);
}
it->it_lock_handle = 0;
it->it_lock_mode = 0;
if (it->it_remote_lock_mode != 0) {
lock_handle.cookie = it->it_remote_lock_handle;
ldlm_lock_decref_and_cancel(&lock_handle,
it->it_remote_lock_mode);
}
it->it_remote_lock_handle = 0;
it->it_remote_lock_mode = 0;
}
RETURN(rc);
}
