lu_kmem_fini(ccc_caches);
}
-static void vvp_object_size_lock(struct cl_object *obj)
-{
- struct inode *inode = vvp_object_inode(obj);
-
- ll_inode_size_lock(inode);
- cl_object_attr_lock(obj);
-}
-
-static void vvp_object_size_unlock(struct cl_object *obj)
-{
- struct inode *inode = vvp_object_inode(obj);
-
- cl_object_attr_unlock(obj);
- ll_inode_size_unlock(inode);
-}
-
-/*****************************************************************************
- *
- * io operations.
- *
- */
-
-int vvp_io_one_lock_index(const struct lu_env *env, struct cl_io *io,
- __u32 enqflags, enum cl_lock_mode mode,
- pgoff_t start, pgoff_t end)
-{
- struct vvp_io *cio = vvp_env_io(env);
- struct cl_lock_descr *descr = &cio->cui_link.cill_descr;
- struct cl_object *obj = io->ci_obj;
-
- CLOBINVRNT(env, obj, vvp_object_invariant(obj));
- ENTRY;
-
- CDEBUG(D_VFSTRACE, "lock: %d [%lu, %lu]\n", mode, start, end);
-
- memset(&cio->cui_link, 0, sizeof cio->cui_link);
-
- if (cio->cui_fd && (cio->cui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
- descr->cld_mode = CLM_GROUP;
- descr->cld_gid = cio->cui_fd->fd_grouplock.cg_gid;
- } else {
- descr->cld_mode = mode;
- }
- descr->cld_obj = obj;
- descr->cld_start = start;
- descr->cld_end = end;
- descr->cld_enq_flags = enqflags;
-
- cl_io_lock_add(env, io, &cio->cui_link);
- RETURN(0);
-}
-
-void vvp_io_update_iov(const struct lu_env *env,
- struct vvp_io *cio, struct cl_io *io)
-{
- int i;
- size_t size = io->u.ci_rw.crw_count;
-
- cio->cui_iov_olen = 0;
- if (!cl_is_normalio(env, io) || cio->cui_tot_nrsegs == 0)
- return;
-
- for (i = 0; i < cio->cui_tot_nrsegs; i++) {
- struct iovec *iv = &cio->cui_iov[i];
-
- if (iv->iov_len < size)
- size -= iv->iov_len;
- else {
- if (iv->iov_len > size) {
- cio->cui_iov_olen = iv->iov_len;
- iv->iov_len = size;
- }
- break;
- }
- }
-
- cio->cui_nrsegs = i + 1;
- LASSERTF(cio->cui_tot_nrsegs >= cio->cui_nrsegs,
- "tot_nrsegs: %lu, nrsegs: %lu\n",
- cio->cui_tot_nrsegs, cio->cui_nrsegs);
-}
-
-int vvp_io_one_lock(const struct lu_env *env, struct cl_io *io,
- __u32 enqflags, enum cl_lock_mode mode,
- loff_t start, loff_t end)
-{
- struct cl_object *obj = io->ci_obj;
-
- return vvp_io_one_lock_index(env, io, enqflags, mode,
- cl_index(obj, start), cl_index(obj, end));
-}
-
-void vvp_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
-{
- CLOBINVRNT(env, ios->cis_io->ci_obj,
- vvp_object_invariant(ios->cis_io->ci_obj));
-}
-
-void vvp_io_advance(const struct lu_env *env,
- const struct cl_io_slice *ios,
- size_t nob)
-{
- struct vvp_io *cio = cl2vvp_io(env, ios);
- struct cl_io *io = ios->cis_io;
- struct cl_object *obj = ios->cis_io->ci_obj;
-
- CLOBINVRNT(env, obj, vvp_object_invariant(obj));
-
- if (!cl_is_normalio(env, io))
- return;
-
- LASSERT(cio->cui_tot_nrsegs >= cio->cui_nrsegs);
- LASSERT(cio->cui_tot_count >= nob);
-
- cio->cui_iov += cio->cui_nrsegs;
- cio->cui_tot_nrsegs -= cio->cui_nrsegs;
- cio->cui_tot_count -= nob;
-
- /* update the iov */
- if (cio->cui_iov_olen > 0) {
- struct iovec *iv;
-
- cio->cui_iov--;
- cio->cui_tot_nrsegs++;
- iv = &cio->cui_iov[0];
- if (io->ci_continue) {
- iv->iov_base += iv->iov_len;
- LASSERT(cio->cui_iov_olen > iv->iov_len);
- iv->iov_len = cio->cui_iov_olen - iv->iov_len;
- } else {
- /* restore the iov_len, in case of restart io. */
- iv->iov_len = cio->cui_iov_olen;
- }
- cio->cui_iov_olen = 0;
- }
-}
-
-/**
- * Helper function that if necessary adjusts file size (inode->i_size), when
- * position at the offset \a pos is accessed. File size can be arbitrary stale
- * on a Lustre client, but client at least knows KMS. If accessed area is
- * inside [0, KMS], set file size to KMS, otherwise glimpse file size.
- *
- * Locking: cl_isize_lock is used to serialize changes to inode size and to
- * protect consistency between inode size and cl_object
- * attributes. cl_object_size_lock() protects consistency between cl_attr's of
- * top-object and sub-objects.
- */
-int ccc_prep_size(const struct lu_env *env, struct cl_object *obj,
- struct cl_io *io, loff_t start, size_t count, int *exceed)
-{
- struct cl_attr *attr = ccc_env_thread_attr(env);
- struct inode *inode = vvp_object_inode(obj);
- loff_t pos = start + count - 1;
- loff_t kms;
- int result;
-
- /*
- * Consistency guarantees: following possibilities exist for the
- * relation between region being accessed and real file size at this
- * moment:
- *
- * (A): the region is completely inside of the file;
- *
- * (B-x): x bytes of region are inside of the file, the rest is
- * outside;
- *
- * (C): the region is completely outside of the file.
- *
- * This classification is stable under DLM lock already acquired by
- * the caller, because to change the class, other client has to take
- * DLM lock conflicting with our lock. Also, any updates to ->i_size
- * by other threads on this client are serialized by
- * ll_inode_size_lock(). This guarantees that short reads are handled
- * correctly in the face of concurrent writes and truncates.
- */
- vvp_object_size_lock(obj);
- result = cl_object_attr_get(env, obj, attr);
- if (result == 0) {
- kms = attr->cat_kms;
- if (pos > kms) {
- /*
- * A glimpse is necessary to determine whether we
- * return a short read (B) or some zeroes at the end
- * of the buffer (C)
- */
- vvp_object_size_unlock(obj);
- result = cl_glimpse_lock(env, io, inode, obj, 0);
- if (result == 0 && exceed != NULL) {
- /* If objective page index exceed end-of-file
- * page index, return directly. Do not expect
- * kernel will check such case correctly.
- * linux-2.6.18-128.1.1 miss to do that.
- * --bug 17336 */
- loff_t size = i_size_read(inode);
- unsigned long cur_index = start >>
- PAGE_CACHE_SHIFT;
-
- if ((size == 0 && cur_index != 0) ||
- (((size - 1) >> PAGE_CACHE_SHIFT) <
- cur_index))
- *exceed = 1;
- }
- return result;
- } else {
- /*
- * region is within kms and, hence, within real file
- * size (A). We need to increase i_size to cover the
- * read region so that generic_file_read() will do its
- * job, but that doesn't mean the kms size is
- * _correct_, it is only the _minimum_ size. If
- * someone does a stat they will get the correct size
- * which will always be >= the kms value here.
- * b=11081
- */
- if (i_size_read(inode) < kms) {
- i_size_write(inode, kms);
- CDEBUG(D_VFSTRACE,
- DFID" updating i_size "LPU64"\n",
- PFID(lu_object_fid(&obj->co_lu)),
- (__u64)i_size_read(inode));
-
- }
- }
- }
-
- vvp_object_size_unlock(obj);
-
- return result;
-}
-
/*****************************************************************************
*
* Transfer operations.
again:
if (cl_io_init(env, io, CIT_SETATTR, io->ci_obj) == 0) {
- struct vvp_io *cio = vvp_env_io(env);
+ 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 */
- cio->cui_fd = LUSTRE_FPRIVATE(attr->ia_file);
+ 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 {
*
*/
-struct vvp_io *cl2vvp_io(const struct lu_env *env,
- const struct cl_io_slice *slice)
-{
- struct vvp_io *cio;
-
- cio = container_of(slice, struct vvp_io, cui_cl);
- LASSERT(cio == vvp_env_io(env));
-
- return cio;
-}
-
struct ccc_req *cl2ccc_req(const struct cl_req_slice *slice)
{
return container_of0(slice, struct ccc_req, crq_cl);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff