| /* |
| * Copyright (C) 2005, 2006 |
| * Avishay Traeger (avishay@gmail.com) |
| * Copyright (C) 2008, 2009 |
| * Boaz Harrosh <bharrosh@panasas.com> |
| * |
| * This file is part of exofs. |
| * |
| * exofs is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation. Since it is based on ext2, and the only |
| * valid version of GPL for the Linux kernel is version 2, the only valid |
| * version of GPL for exofs is version 2. |
| * |
| * exofs 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 for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with exofs; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <scsi/scsi_device.h> |
| |
| #include "exofs.h" |
| |
| #define EXOFS_DBGMSG2(M...) do {} while (0) |
| /* #define EXOFS_DBGMSG2 EXOFS_DBGMSG */ |
| |
| void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj) |
| { |
| osd_sec_init_nosec_doall_caps(cred_a, obj, false, true); |
| } |
| |
| int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj, |
| u64 offset, void *p, unsigned length) |
| { |
| struct osd_request *or = osd_start_request(od, GFP_KERNEL); |
| /* struct osd_sense_info osi = {.key = 0};*/ |
| int ret; |
| |
| if (unlikely(!or)) { |
| EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__); |
| return -ENOMEM; |
| } |
| ret = osd_req_read_kern(or, obj, offset, p, length); |
| if (unlikely(ret)) { |
| EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__); |
| goto out; |
| } |
| |
| ret = osd_finalize_request(or, 0, cred, NULL); |
| if (unlikely(ret)) { |
| EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret); |
| goto out; |
| } |
| |
| ret = osd_execute_request(or); |
| if (unlikely(ret)) |
| EXOFS_DBGMSG("osd_execute_request() => %d\n", ret); |
| /* osd_req_decode_sense(or, ret); */ |
| |
| out: |
| osd_end_request(or); |
| return ret; |
| } |
| |
| int exofs_get_io_state(struct exofs_layout *layout, |
| struct exofs_io_state **pios) |
| { |
| struct exofs_io_state *ios; |
| |
| /*TODO: Maybe use kmem_cach per sbi of size |
| * exofs_io_state_size(layout->s_numdevs) |
| */ |
| ios = kzalloc(exofs_io_state_size(layout->s_numdevs), GFP_KERNEL); |
| if (unlikely(!ios)) { |
| EXOFS_DBGMSG("Faild kzalloc bytes=%d\n", |
| exofs_io_state_size(layout->s_numdevs)); |
| *pios = NULL; |
| return -ENOMEM; |
| } |
| |
| ios->layout = layout; |
| ios->obj.partition = layout->s_pid; |
| *pios = ios; |
| return 0; |
| } |
| |
| void exofs_put_io_state(struct exofs_io_state *ios) |
| { |
| if (ios) { |
| unsigned i; |
| |
| for (i = 0; i < ios->numdevs; i++) { |
| struct exofs_per_dev_state *per_dev = &ios->per_dev[i]; |
| |
| if (per_dev->or) |
| osd_end_request(per_dev->or); |
| if (per_dev->bio) |
| bio_put(per_dev->bio); |
| } |
| |
| kfree(ios); |
| } |
| } |
| |
| static void _sync_done(struct exofs_io_state *ios, void *p) |
| { |
| struct completion *waiting = p; |
| |
| complete(waiting); |
| } |
| |
| static void _last_io(struct kref *kref) |
| { |
| struct exofs_io_state *ios = container_of( |
| kref, struct exofs_io_state, kref); |
| |
| ios->done(ios, ios->private); |
| } |
| |
| static void _done_io(struct osd_request *or, void *p) |
| { |
| struct exofs_io_state *ios = p; |
| |
| kref_put(&ios->kref, _last_io); |
| } |
| |
| static int exofs_io_execute(struct exofs_io_state *ios) |
| { |
| DECLARE_COMPLETION_ONSTACK(wait); |
| bool sync = (ios->done == NULL); |
| int i, ret; |
| |
| if (sync) { |
| ios->done = _sync_done; |
| ios->private = &wait; |
| } |
| |
| for (i = 0; i < ios->numdevs; i++) { |
| struct osd_request *or = ios->per_dev[i].or; |
| if (unlikely(!or)) |
| continue; |
| |
| ret = osd_finalize_request(or, 0, ios->cred, NULL); |
| if (unlikely(ret)) { |
| EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", |
| ret); |
| return ret; |
| } |
| } |
| |
| kref_init(&ios->kref); |
| |
| for (i = 0; i < ios->numdevs; i++) { |
| struct osd_request *or = ios->per_dev[i].or; |
| if (unlikely(!or)) |
| continue; |
| |
| kref_get(&ios->kref); |
| osd_execute_request_async(or, _done_io, ios); |
| } |
| |
| kref_put(&ios->kref, _last_io); |
| ret = 0; |
| |
| if (sync) { |
| wait_for_completion(&wait); |
| ret = exofs_check_io(ios, NULL); |
| } |
| return ret; |
| } |
| |
| static void _clear_bio(struct bio *bio) |
| { |
| struct bio_vec *bv; |
| unsigned i; |
| |
| __bio_for_each_segment(bv, bio, i, 0) { |
| unsigned this_count = bv->bv_len; |
| |
| if (likely(PAGE_SIZE == this_count)) |
| clear_highpage(bv->bv_page); |
| else |
| zero_user(bv->bv_page, bv->bv_offset, this_count); |
| } |
| } |
| |
| int exofs_check_io(struct exofs_io_state *ios, u64 *resid) |
| { |
| enum osd_err_priority acumulated_osd_err = 0; |
| int acumulated_lin_err = 0; |
| int i; |
| |
| for (i = 0; i < ios->numdevs; i++) { |
| struct osd_sense_info osi; |
| struct osd_request *or = ios->per_dev[i].or; |
| int ret; |
| |
| if (unlikely(!or)) |
| continue; |
| |
| ret = osd_req_decode_sense(or, &osi); |
| if (likely(!ret)) |
| continue; |
| |
| if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) { |
| /* start read offset passed endof file */ |
| _clear_bio(ios->per_dev[i].bio); |
| EXOFS_DBGMSG("start read offset passed end of file " |
| "offset=0x%llx, length=0x%llx\n", |
| _LLU(ios->offset), |
| _LLU(ios->length)); |
| |
| continue; /* we recovered */ |
| } |
| |
| if (osi.osd_err_pri >= acumulated_osd_err) { |
| acumulated_osd_err = osi.osd_err_pri; |
| acumulated_lin_err = ret; |
| } |
| } |
| |
| /* TODO: raid specific residual calculations */ |
| if (resid) { |
| if (likely(!acumulated_lin_err)) |
| *resid = 0; |
| else |
| *resid = ios->length; |
| } |
| |
| return acumulated_lin_err; |
| } |
| |
| int exofs_sbi_create(struct exofs_io_state *ios) |
| { |
| int i, ret; |
| |
| for (i = 0; i < ios->layout->s_numdevs; i++) { |
| struct osd_request *or; |
| |
| or = osd_start_request(ios->layout->s_ods[i], GFP_KERNEL); |
| if (unlikely(!or)) { |
| EXOFS_ERR("%s: osd_start_request failed\n", __func__); |
| ret = -ENOMEM; |
| goto out; |
| } |
| ios->per_dev[i].or = or; |
| ios->numdevs++; |
| |
| osd_req_create_object(or, &ios->obj); |
| } |
| ret = exofs_io_execute(ios); |
| |
| out: |
| return ret; |
| } |
| |
| int exofs_sbi_remove(struct exofs_io_state *ios) |
| { |
| int i, ret; |
| |
| for (i = 0; i < ios->layout->s_numdevs; i++) { |
| struct osd_request *or; |
| |
| or = osd_start_request(ios->layout->s_ods[i], GFP_KERNEL); |
| if (unlikely(!or)) { |
| EXOFS_ERR("%s: osd_start_request failed\n", __func__); |
| ret = -ENOMEM; |
| goto out; |
| } |
| ios->per_dev[i].or = or; |
| ios->numdevs++; |
| |
| osd_req_remove_object(or, &ios->obj); |
| } |
| ret = exofs_io_execute(ios); |
| |
| out: |
| return ret; |
| } |
| |
| int exofs_sbi_write(struct exofs_io_state *ios) |
| { |
| int i, ret; |
| |
| for (i = 0; i < ios->layout->s_numdevs; i++) { |
| struct osd_request *or; |
| |
| or = osd_start_request(ios->layout->s_ods[i], GFP_KERNEL); |
| if (unlikely(!or)) { |
| EXOFS_ERR("%s: osd_start_request failed\n", __func__); |
| ret = -ENOMEM; |
| goto out; |
| } |
| ios->per_dev[i].or = or; |
| ios->numdevs++; |
| |
| if (ios->bio) { |
| struct bio *bio; |
| |
| if (i != 0) { |
| bio = bio_kmalloc(GFP_KERNEL, |
| ios->bio->bi_max_vecs); |
| if (unlikely(!bio)) { |
| EXOFS_DBGMSG( |
| "Faild to allocate BIO size=%u\n", |
| ios->bio->bi_max_vecs); |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| __bio_clone(bio, ios->bio); |
| bio->bi_bdev = NULL; |
| bio->bi_next = NULL; |
| ios->per_dev[i].bio = bio; |
| } else { |
| bio = ios->bio; |
| } |
| |
| osd_req_write(or, &ios->obj, ios->offset, bio, |
| ios->length); |
| EXOFS_DBGMSG("write(0x%llx) offset=0x%llx " |
| "length=0x%llx dev=%d\n", |
| _LLU(ios->obj.id), _LLU(ios->offset), |
| _LLU(ios->length), i); |
| } else if (ios->kern_buff) { |
| osd_req_write_kern(or, &ios->obj, ios->offset, |
| ios->kern_buff, ios->length); |
| EXOFS_DBGMSG2("write_kern(0x%llx) offset=0x%llx " |
| "length=0x%llx dev=%d\n", |
| _LLU(ios->obj.id), _LLU(ios->offset), |
| _LLU(ios->length), i); |
| } else { |
| osd_req_set_attributes(or, &ios->obj); |
| EXOFS_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n", |
| _LLU(ios->obj.id), ios->out_attr_len, i); |
| } |
| |
| if (ios->out_attr) |
| osd_req_add_set_attr_list(or, ios->out_attr, |
| ios->out_attr_len); |
| |
| if (ios->in_attr) |
| osd_req_add_get_attr_list(or, ios->in_attr, |
| ios->in_attr_len); |
| } |
| ret = exofs_io_execute(ios); |
| |
| out: |
| return ret; |
| } |
| |
| int exofs_sbi_read(struct exofs_io_state *ios) |
| { |
| struct osd_request *or; |
| struct exofs_per_dev_state *per_dev = &ios->per_dev[0]; |
| unsigned first_dev = (unsigned)ios->obj.id; |
| |
| first_dev %= ios->layout->s_numdevs; |
| or = osd_start_request(ios->layout->s_ods[first_dev], GFP_KERNEL); |
| if (unlikely(!or)) { |
| EXOFS_ERR("%s: osd_start_request failed\n", __func__); |
| return -ENOMEM; |
| } |
| per_dev->or = or; |
| ios->numdevs++; |
| |
| if (ios->bio) { |
| osd_req_read(or, &ios->obj, ios->offset, ios->bio, ios->length); |
| EXOFS_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx" |
| " dev=%d\n", _LLU(ios->obj.id), |
| _LLU(ios->offset), _LLU(ios->length), |
| first_dev); |
| } else if (ios->kern_buff) { |
| int ret = osd_req_read_kern(or, &ios->obj, ios->offset, |
| ios->kern_buff, ios->length); |
| |
| EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx " |
| "length=0x%llx dev=%d ret=>%d\n", |
| _LLU(ios->obj.id), _LLU(ios->offset), |
| _LLU(ios->length), first_dev, ret); |
| if (unlikely(ret)) |
| return ret; |
| } else { |
| osd_req_get_attributes(or, &ios->obj); |
| EXOFS_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n", |
| _LLU(ios->obj.id), ios->in_attr_len, first_dev); |
| } |
| |
| if (ios->out_attr) |
| osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len); |
| |
| if (ios->in_attr) |
| osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len); |
| |
| return exofs_io_execute(ios); |
| } |
| |
| int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr) |
| { |
| struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */ |
| void *iter = NULL; |
| int nelem; |
| |
| do { |
| nelem = 1; |
| osd_req_decode_get_attr_list(ios->per_dev[0].or, |
| &cur_attr, &nelem, &iter); |
| if ((cur_attr.attr_page == attr->attr_page) && |
| (cur_attr.attr_id == attr->attr_id)) { |
| attr->len = cur_attr.len; |
| attr->val_ptr = cur_attr.val_ptr; |
| return 0; |
| } |
| } while (iter); |
| |
| return -EIO; |
| } |
| |
| int exofs_oi_truncate(struct exofs_i_info *oi, u64 size) |
| { |
| struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info; |
| struct exofs_io_state *ios; |
| struct osd_attr attr; |
| __be64 newsize; |
| int i, ret; |
| |
| if (exofs_get_io_state(&sbi->layout, &ios)) |
| return -ENOMEM; |
| |
| ios->obj.id = exofs_oi_objno(oi); |
| ios->cred = oi->i_cred; |
| |
| newsize = cpu_to_be64(size); |
| attr = g_attr_logical_length; |
| attr.val_ptr = &newsize; |
| |
| for (i = 0; i < sbi->layout.s_numdevs; i++) { |
| struct osd_request *or; |
| |
| or = osd_start_request(sbi->layout.s_ods[i], GFP_KERNEL); |
| if (unlikely(!or)) { |
| EXOFS_ERR("%s: osd_start_request failed\n", __func__); |
| ret = -ENOMEM; |
| goto out; |
| } |
| ios->per_dev[i].or = or; |
| ios->numdevs++; |
| |
| osd_req_set_attributes(or, &ios->obj); |
| osd_req_add_set_attr_list(or, &attr, 1); |
| } |
| ret = exofs_io_execute(ios); |
| |
| out: |
| exofs_put_io_state(ios); |
| return ret; |
| } |