diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/llite/lcommon_cl.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/llite/lcommon_cl.c | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/llite/lcommon_cl.c b/drivers/staging/lustre/lustre/llite/lcommon_cl.c new file mode 100644 index 000000000000..6c00715b438f --- /dev/null +++ b/drivers/staging/lustre/lustre/llite/lcommon_cl.c @@ -0,0 +1,327 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program 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 version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2011, 2015, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * cl code shared between vvp and liblustre (and other Lustre clients in the + * future). + * + * Author: Nikita Danilov <nikita.danilov@sun.com> + */ + +#define DEBUG_SUBSYSTEM S_LLITE + +#include "../../include/linux/libcfs/libcfs.h" +# include <linux/fs.h> +# include <linux/sched.h> +# include <linux/mm.h> +# include <linux/quotaops.h> +# include <linux/highmem.h> +# include <linux/pagemap.h> +# include <linux/rbtree.h> + +#include "../include/obd.h" +#include "../include/obd_support.h" +#include "../include/lustre_fid.h" +#include "../include/lustre_lite.h" +#include "../include/lustre_dlm.h" +#include "../include/lustre_ver.h" +#include "../include/lustre_mdc.h" +#include "../include/cl_object.h" + +#include "../llite/llite_internal.h" + +/* + * ccc_ prefix stands for "Common Client Code". + */ + +/***************************************************************************** + * + * Vvp device and device type functions. + * + */ + +/** + * An `emergency' environment used by cl_inode_fini() when cl_env_get() + * fails. Access to this environment is serialized by cl_inode_fini_guard + * mutex. + */ +struct lu_env *cl_inode_fini_env; +int cl_inode_fini_refcheck; + +/** + * A mutex serializing calls to slp_inode_fini() under extreme memory + * pressure, when environments cannot be allocated. + */ +static DEFINE_MUTEX(cl_inode_fini_guard); + +int cl_setattr_ost(struct inode *inode, const struct iattr *attr) +{ + struct lu_env *env; + struct cl_io *io; + int result; + int refcheck; + + env = cl_env_get(&refcheck); + if (IS_ERR(env)) + return PTR_ERR(env); + + io = vvp_env_thread_io(env); + io->ci_obj = ll_i2info(inode)->lli_clob; + + io->u.ci_setattr.sa_attr.lvb_atime = LTIME_S(attr->ia_atime); + io->u.ci_setattr.sa_attr.lvb_mtime = LTIME_S(attr->ia_mtime); + io->u.ci_setattr.sa_attr.lvb_ctime = LTIME_S(attr->ia_ctime); + io->u.ci_setattr.sa_attr.lvb_size = attr->ia_size; + io->u.ci_setattr.sa_valid = attr->ia_valid; + +again: + if (cl_io_init(env, io, CIT_SETATTR, io->ci_obj) == 0) { + struct vvp_io *vio = vvp_env_io(env); + + if (attr->ia_valid & ATTR_FILE) + /* populate the file descriptor for ftruncate to honor + * group lock - see LU-787 + */ + vio->vui_fd = LUSTRE_FPRIVATE(attr->ia_file); + + result = cl_io_loop(env, io); + } else { + result = io->ci_result; + } + cl_io_fini(env, io); + if (unlikely(io->ci_need_restart)) + goto again; + /* HSM import case: file is released, cannot be restored + * no need to fail except if restore registration failed + * with -ENODATA + */ + if (result == -ENODATA && io->ci_restore_needed && + io->ci_result != -ENODATA) + result = 0; + cl_env_put(env, &refcheck); + return result; +} + +/** + * Initialize or update CLIO structures for regular files when new + * meta-data arrives from the server. + * + * \param inode regular file inode + * \param md new file metadata from MDS + * - allocates cl_object if necessary, + * - updated layout, if object was already here. + */ +int cl_file_inode_init(struct inode *inode, struct lustre_md *md) +{ + struct lu_env *env; + struct ll_inode_info *lli; + struct cl_object *clob; + struct lu_site *site; + struct lu_fid *fid; + struct cl_object_conf conf = { + .coc_inode = inode, + .u = { + .coc_md = md + } + }; + int result = 0; + int refcheck; + + LASSERT(md->body->valid & OBD_MD_FLID); + LASSERT(S_ISREG(inode->i_mode)); + + env = cl_env_get(&refcheck); + if (IS_ERR(env)) + return PTR_ERR(env); + + site = ll_i2sbi(inode)->ll_site; + lli = ll_i2info(inode); + fid = &lli->lli_fid; + LASSERT(fid_is_sane(fid)); + + if (!lli->lli_clob) { + /* clob is slave of inode, empty lli_clob means for new inode, + * there is no clob in cache with the given fid, so it is + * unnecessary to perform lookup-alloc-lookup-insert, just + * alloc and insert directly. + */ + LASSERT(inode->i_state & I_NEW); + conf.coc_lu.loc_flags = LOC_F_NEW; + clob = cl_object_find(env, lu2cl_dev(site->ls_top_dev), + fid, &conf); + if (!IS_ERR(clob)) { + /* + * No locking is necessary, as new inode is + * locked by I_NEW bit. + */ + lli->lli_clob = clob; + lli->lli_has_smd = lsm_has_objects(md->lsm); + lu_object_ref_add(&clob->co_lu, "inode", inode); + } else { + result = PTR_ERR(clob); + } + } else { + result = cl_conf_set(env, lli->lli_clob, &conf); + } + + cl_env_put(env, &refcheck); + + if (result != 0) + CERROR("Failure to initialize cl object " DFID ": %d\n", + PFID(fid), result); + return result; +} + +/** + * Wait for others drop their references of the object at first, then we drop + * the last one, which will lead to the object be destroyed immediately. + * Must be called after cl_object_kill() against this object. + * + * The reason we want to do this is: destroying top object will wait for sub + * objects being destroyed first, so we can't let bottom layer (e.g. from ASTs) + * to initiate top object destroying which may deadlock. See bz22520. + */ +static void cl_object_put_last(struct lu_env *env, struct cl_object *obj) +{ + struct lu_object_header *header = obj->co_lu.lo_header; + wait_queue_t waiter; + + if (unlikely(atomic_read(&header->loh_ref) != 1)) { + struct lu_site *site = obj->co_lu.lo_dev->ld_site; + struct lu_site_bkt_data *bkt; + + bkt = lu_site_bkt_from_fid(site, &header->loh_fid); + + init_waitqueue_entry(&waiter, current); + add_wait_queue(&bkt->lsb_marche_funebre, &waiter); + + while (1) { + set_current_state(TASK_UNINTERRUPTIBLE); + if (atomic_read(&header->loh_ref) == 1) + break; + schedule(); + } + + set_current_state(TASK_RUNNING); + remove_wait_queue(&bkt->lsb_marche_funebre, &waiter); + } + + cl_object_put(env, obj); +} + +void cl_inode_fini(struct inode *inode) +{ + struct lu_env *env; + struct ll_inode_info *lli = ll_i2info(inode); + struct cl_object *clob = lli->lli_clob; + int refcheck; + int emergency; + + if (clob) { + void *cookie; + + cookie = cl_env_reenter(); + env = cl_env_get(&refcheck); + emergency = IS_ERR(env); + if (emergency) { + mutex_lock(&cl_inode_fini_guard); + LASSERT(cl_inode_fini_env); + cl_env_implant(cl_inode_fini_env, &refcheck); + env = cl_inode_fini_env; + } + /* + * cl_object cache is a slave to inode cache (which, in turn + * is a slave to dentry cache), don't keep cl_object in memory + * when its master is evicted. + */ + cl_object_kill(env, clob); + lu_object_ref_del(&clob->co_lu, "inode", inode); + cl_object_put_last(env, clob); + lli->lli_clob = NULL; + if (emergency) { + cl_env_unplant(cl_inode_fini_env, &refcheck); + mutex_unlock(&cl_inode_fini_guard); + } else { + cl_env_put(env, &refcheck); + } + cl_env_reexit(cookie); + } +} + +/** + * build inode number from passed @fid + */ +__u64 cl_fid_build_ino(const struct lu_fid *fid, int api32) +{ + if (BITS_PER_LONG == 32 || api32) + return fid_flatten32(fid); + else + return fid_flatten(fid); +} + +/** + * build inode generation from passed @fid. If our FID overflows the 32-bit + * inode number then return a non-zero generation to distinguish them. + */ +__u32 cl_fid_build_gen(const struct lu_fid *fid) +{ + __u32 gen; + + if (fid_is_igif(fid)) { + gen = lu_igif_gen(fid); + return gen; + } + + gen = fid_flatten(fid) >> 32; + return gen; +} + +/* lsm is unreliable after hsm implementation as layout can be changed at + * any time. This is only to support old, non-clio-ized interfaces. It will + * cause deadlock if clio operations are called with this extra layout refcount + * because in case the layout changed during the IO, ll_layout_refresh() will + * have to wait for the refcount to become zero to destroy the older layout. + * + * Notice that the lsm returned by this function may not be valid unless called + * inside layout lock - MDS_INODELOCK_LAYOUT. + */ +struct lov_stripe_md *ccc_inode_lsm_get(struct inode *inode) +{ + return lov_lsm_get(ll_i2info(inode)->lli_clob); +} + +inline void ccc_inode_lsm_put(struct inode *inode, struct lov_stripe_md *lsm) +{ + lov_lsm_put(ll_i2info(inode)->lli_clob, lsm); +} |