int cl_get_grouplock(struct cl_object *obj, unsigned long gid, int nonblock,
struct ccc_grouplock *cg)
{
struct lu_env *env;
struct cl_io *io;
struct cl_lock *lock;
struct cl_lock_descr *descr;
__u32 enqflags;
int refcheck;
int rc;
env = cl_env_get(&refcheck);
if (IS_ERR(env))
return PTR_ERR(env);
io = &ccc_env_info(env)->cti_io;
io->ci_obj = obj;
rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
if (rc) {
LASSERT(rc < 0);
cl_env_put(env, &refcheck);
return rc;
}
descr = &ccc_env_info(env)->cti_descr;
descr->cld_obj = obj;
descr->cld_start = 0;
descr->cld_end = CL_PAGE_EOF;
descr->cld_gid = gid;
descr->cld_mode = CLM_GROUP;
enqflags = CEF_MUST | (nonblock ? CEF_NONBLOCK : 0);
descr->cld_enq_flags = enqflags;
lock = cl_lock_request(env, io, descr, GROUPLOCK_SCOPE, cfs_current());
if (IS_ERR(lock)) {
cl_io_fini(env, io);
cl_env_put(env, &refcheck);
return PTR_ERR(lock);
}
cg->cg_env = cl_env_get(&refcheck);
cg->cg_lock = lock;
cg->cg_gid = gid;
LASSERT(cg->cg_env == env);
cl_env_unplant(env, &refcheck);
return 0;
}
int cl_get_grouplock(struct cl_object *obj, unsigned long gid, int nonblock,
struct ccc_grouplock *cg)
{
struct lu_env *env;
struct cl_io *io;
struct cl_lock *lock;
struct cl_lock_descr *descr;
__u32 enqflags;
int refcheck;
int rc;
env = cl_env_get(&refcheck);
if (IS_ERR(env))
return PTR_ERR(env);
io = ccc_env_thread_io(env);
io->ci_obj = obj;
io->ci_ignore_layout = 1;
rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
if (rc) {
cl_io_fini(env, io);
cl_env_put(env, &refcheck);
/* Does not make sense to take GL for released layout */
if (rc > 0)
rc = -ENOTSUPP;
return rc;
}
descr = &ccc_env_info(env)->cti_descr;
descr->cld_obj = obj;
descr->cld_start = 0;
descr->cld_end = CL_PAGE_EOF;
descr->cld_gid = gid;
descr->cld_mode = CLM_GROUP;
enqflags = CEF_MUST | (nonblock ? CEF_NONBLOCK : 0);
descr->cld_enq_flags = enqflags;
lock = cl_lock_request(env, io, descr, GROUPLOCK_SCOPE, current);
if (IS_ERR(lock)) {
cl_io_fini(env, io);
cl_env_put(env, &refcheck);
return PTR_ERR(lock);
}
cg->cg_env = cl_env_get(&refcheck);
cg->cg_io = io;
cg->cg_lock = lock;
cg->cg_gid = gid;
LASSERT(cg->cg_env == env);
cl_env_unplant(env, &refcheck);
return 0;
}
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);
}
static int vvp_mmap_locks(const struct lu_env *env,
struct ccc_io *vio, struct cl_io *io)
{
struct ccc_thread_info *cti = ccc_env_info(env);
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
struct cl_lock_descr *descr = &cti->cti_descr;
ldlm_policy_data_t policy;
unsigned long addr;
unsigned long seg;
ssize_t count;
int result;
ENTRY;
LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
if (!cl_is_normalio(env, io))
RETURN(0);
if (vio->cui_iov == NULL) /* nfs or loop back device write */
RETURN(0);
/* No MM (e.g. NFS)? No vmas too. */
if (mm == NULL)
RETURN(0);
for (seg = 0; seg < vio->cui_nrsegs; seg++) {
const struct iovec *iv = &vio->cui_iov[seg];
addr = (unsigned long)iv->iov_base;
count = iv->iov_len;
if (count == 0)
continue;
count += addr & (~CFS_PAGE_MASK);
addr &= CFS_PAGE_MASK;
down_read(&mm->mmap_sem);
while((vma = our_vma(mm, addr, count)) != NULL) {
struct inode *inode = vma->vm_file->f_dentry->d_inode;
int flags = CEF_MUST;
if (ll_file_nolock(vma->vm_file)) {
/*
* For no lock case, a lockless lock will be
* generated.
*/
flags = CEF_NEVER;
}
/*
* XXX: Required lock mode can be weakened: CIT_WRITE
* io only ever reads user level buffer, and CIT_READ
* only writes on it.
*/
policy_from_vma(&policy, vma, addr, count);
descr->cld_mode = vvp_mode_from_vma(vma);
descr->cld_obj = ll_i2info(inode)->lli_clob;
descr->cld_start = cl_index(descr->cld_obj,
policy.l_extent.start);
descr->cld_end = cl_index(descr->cld_obj,
policy.l_extent.end);
descr->cld_enq_flags = flags;
result = cl_io_lock_alloc_add(env, io, descr);
CDEBUG(D_VFSTRACE, "lock: %d: [%lu, %lu]\n",
descr->cld_mode, descr->cld_start,
descr->cld_end);
if (result < 0)
RETURN(result);
if (vma->vm_end - addr >= count)
break;
count -= vma->vm_end - addr;
addr = vma->vm_end;
}
up_read(&mm->mmap_sem);
}
RETURN(0);
}
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);
}
