int cl_glimpse_lock(const struct lu_env *env, struct cl_io *io,
struct inode *inode, struct cl_object *clob, int agl)
{
const struct lu_fid *fid = lu_object_fid(&clob->co_lu);
struct cl_lock *lock = vvp_env_lock(env);
struct cl_lock_descr *descr = &lock->cll_descr;
int result = 0;
CDEBUG(D_DLMTRACE, "Glimpsing inode " DFID "\n", PFID(fid));
/* NOTE: this looks like DLM lock request, but it may
* not be one. Due to CEF_ASYNC flag (translated
* to LDLM_FL_HAS_INTENT by osc), this is
* glimpse request, that won't revoke any
* conflicting DLM locks held. Instead,
* ll_glimpse_callback() will be called on each
* client holding a DLM lock against this file,
* and resulting size will be returned for each
* stripe. DLM lock on [0, EOF] is acquired only
* if there were no conflicting locks. If there
* were conflicting locks, enqueuing or waiting
* fails with -ENAVAIL, but valid inode
* attributes are returned anyway.
*/
*descr = whole_file;
descr->cld_obj = clob;
descr->cld_mode = CLM_READ;
descr->cld_enq_flags = CEF_ASYNC | CEF_MUST;
if (agl)
descr->cld_enq_flags |= CEF_AGL;
/*
* CEF_ASYNC is used because glimpse sub-locks cannot
* deadlock (because they never conflict with other
* locks) and, hence, can be enqueued out-of-order.
*
* CEF_MUST protects glimpse lock from conversion into
* a lockless mode.
*/
result = cl_lock_request(env, io, lock);
if (result < 0)
return result;
if (!agl) {
ll_merge_attr(env, inode);
if (i_size_read(inode) > 0 && !inode->i_blocks) {
/*
* LU-417: Add dirty pages block count
* lest i_blocks reports 0, some "cp" or
* "tar" may think it's a completely
* sparse file and skip it.
*/
inode->i_blocks = dirty_cnt(inode);
}
}
cl_lock_release(env, lock);
return result;
}
void cl_put_grouplock(struct ll_grouplock *lg)
{
struct lu_env *env = lg->lg_env;
struct cl_io *io = lg->lg_io;
struct cl_lock *lock = lg->lg_lock;
LASSERT(lg->lg_env != NULL);
LASSERT(lg->lg_gid != 0);
cl_lock_release(env, lock);
cl_io_fini(env, io);
cl_env_put(env, NULL);
}
void cl_put_grouplock(struct ccc_grouplock *cg)
{
struct lu_env *env = cg->cg_env;
struct cl_lock *lock = cg->cg_lock;
int refcheck;
LASSERT(cg->cg_env);
LASSERT(cg->cg_gid);
cl_env_implant(env, &refcheck);
cl_env_put(env, &refcheck);
cl_unuse(env, lock);
cl_lock_release(env, lock, GROUPLOCK_SCOPE, cfs_current());
cl_io_fini(env, &ccc_env_info(env)->cti_io);
cl_env_put(env, NULL);
}
int cl_local_size(struct inode *inode)
{
struct lu_env *env = NULL;
struct cl_io *io = NULL;
struct ccc_thread_info *cti;
struct cl_object *clob;
struct cl_lock_descr *descr;
struct cl_lock *lock;
int result;
int refcheck;
ENTRY;
if (!cl_i2info(inode)->lli_has_smd)
RETURN(0);
result = cl_io_get(inode, &env, &io, &refcheck);
if (result <= 0)
RETURN(result);
clob = io->ci_obj;
result = cl_io_init(env, io, CIT_MISC, clob);
if (result > 0)
result = io->ci_result;
else if (result == 0) {
cti = ccc_env_info(env);
descr = &cti->cti_descr;
*descr = whole_file;
descr->cld_obj = clob;
lock = cl_lock_peek(env, io, descr, "localsize", current);
if (lock != NULL) {
cl_merge_lvb(env, inode);
cl_unuse(env, lock);
cl_lock_release(env, lock, "localsize", current);
result = 0;
} else
result = -ENODATA;
}
cl_io_fini(env, io);
cl_env_put(env, &refcheck);
RETURN(result);
}
int cl_glimpse_lock(const struct lu_env *env, struct cl_io *io,
struct inode *inode, struct cl_object *clob, int agl)
{
struct cl_lock_descr *descr = &ccc_env_info(env)->cti_descr;
struct cl_inode_info *lli = cl_i2info(inode);
const struct lu_fid *fid = lu_object_fid(&clob->co_lu);
struct ccc_io *cio = ccc_env_io(env);
struct cl_lock *lock;
int result;
ENTRY;
result = 0;
if (!(lli->lli_flags & LLIF_MDS_SIZE_LOCK)) {
CDEBUG(D_DLMTRACE, "Glimpsing inode "DFID"\n", PFID(fid));
if (lli->lli_has_smd) {
/* NOTE: this looks like DLM lock request, but it may
* not be one. Due to CEF_ASYNC flag (translated
* to LDLM_FL_HAS_INTENT by osc), this is
* glimpse request, that won't revoke any
* conflicting DLM locks held. Instead,
* ll_glimpse_callback() will be called on each
* client holding a DLM lock against this file,
* and resulting size will be returned for each
* stripe. DLM lock on [0, EOF] is acquired only
* if there were no conflicting locks. If there
* were conflicting locks, enqueuing or waiting
* fails with -ENAVAIL, but valid inode
* attributes are returned anyway. */
*descr = whole_file;
descr->cld_obj = clob;
descr->cld_mode = CLM_PHANTOM;
descr->cld_enq_flags = CEF_ASYNC | CEF_MUST;
if (agl)
descr->cld_enq_flags |= CEF_AGL;
cio->cui_glimpse = 1;
/*
* CEF_ASYNC is used because glimpse sub-locks cannot
* deadlock (because they never conflict with other
* locks) and, hence, can be enqueued out-of-order.
*
* CEF_MUST protects glimpse lock from conversion into
* a lockless mode.
*/
lock = cl_lock_request(env, io, descr, "glimpse",
current);
cio->cui_glimpse = 0;
if (lock == NULL)
RETURN(0);
if (IS_ERR(lock))
RETURN(PTR_ERR(lock));
LASSERT(agl == 0);
result = cl_wait(env, lock);
if (result == 0) {
cl_merge_lvb(env, inode);
if (cl_isize_read(inode) > 0 &&
inode->i_blocks == 0) {
/*
* LU-417: Add dirty pages block count
* lest i_blocks reports 0, some "cp" or
* "tar" may think it's a completely
* sparse file and skip it.
*/
inode->i_blocks = dirty_cnt(inode);
}
cl_unuse(env, lock);
}
cl_lock_release(env, lock, "glimpse", current);
} else {
CDEBUG(D_DLMTRACE, "No objects for inode\n");
cl_merge_lvb(env, inode);
}
}
RETURN(result);
}