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1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 | #include <linux/ceph/ceph_debug.h> #include <linux/module.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/file.h> #include <linux/mount.h> #include <linux/namei.h> #include <linux/writeback.h> #include <linux/falloc.h> #include "super.h" #include "mds_client.h" #include "cache.h" static __le32 ceph_flags_sys2wire(u32 flags) { u32 wire_flags = 0; switch (flags & O_ACCMODE) { case O_RDONLY: wire_flags |= CEPH_O_RDONLY; break; case O_WRONLY: wire_flags |= CEPH_O_WRONLY; break; case O_RDWR: wire_flags |= CEPH_O_RDWR; break; } #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; } ceph_sys2wire(O_CREAT); ceph_sys2wire(O_EXCL); ceph_sys2wire(O_TRUNC); ceph_sys2wire(O_DIRECTORY); ceph_sys2wire(O_NOFOLLOW); #undef ceph_sys2wire if (flags) dout("unused open flags: %x", flags); return cpu_to_le32(wire_flags); } /* * Ceph file operations * * Implement basic open/close functionality, and implement * read/write. * * We implement three modes of file I/O: * - buffered uses the generic_file_aio_{read,write} helpers * * - synchronous is used when there is multi-client read/write * sharing, avoids the page cache, and synchronously waits for an * ack from the OSD. * * - direct io takes the variant of the sync path that references * user pages directly. * * fsync() flushes and waits on dirty pages, but just queues metadata * for writeback: since the MDS can recover size and mtime there is no * need to wait for MDS acknowledgement. */ /* * Calculate the length sum of direct io vectors that can * be combined into one page vector. */ static size_t dio_get_pagev_size(const struct iov_iter *it) { const struct iovec *iov = it->iov; const struct iovec *iovend = iov + it->nr_segs; size_t size; size = iov->iov_len - it->iov_offset; /* * An iov can be page vectored when both the current tail * and the next base are page aligned. */ while (PAGE_ALIGNED((iov->iov_base + iov->iov_len)) && (++iov < iovend && PAGE_ALIGNED((iov->iov_base)))) { size += iov->iov_len; } dout("dio_get_pagevlen len = %zu\n", size); return size; } /* * Allocate a page vector based on (@it, @nbytes). * The return value is the tuple describing a page vector, * that is (@pages, @page_align, @num_pages). */ static struct page ** dio_get_pages_alloc(const struct iov_iter *it, size_t nbytes, size_t *page_align, int *num_pages) { struct iov_iter tmp_it = *it; size_t align; struct page **pages; int ret = 0, idx, npages; align = (unsigned long)(it->iov->iov_base + it->iov_offset) & (PAGE_SIZE - 1); npages = calc_pages_for(align, nbytes); pages = kvmalloc(sizeof(*pages) * npages, GFP_KERNEL); if (!pages) return ERR_PTR(-ENOMEM); for (idx = 0; idx < npages; ) { size_t start; ret = iov_iter_get_pages(&tmp_it, pages + idx, nbytes, npages - idx, &start); if (ret < 0) goto fail; iov_iter_advance(&tmp_it, ret); nbytes -= ret; idx += (ret + start + PAGE_SIZE - 1) / PAGE_SIZE; } BUG_ON(nbytes != 0); *num_pages = npages; *page_align = align; dout("dio_get_pages_alloc: got %d pages align %zu\n", npages, align); return pages; fail: ceph_put_page_vector(pages, idx, false); return ERR_PTR(ret); } /* * Prepare an open request. Preallocate ceph_cap to avoid an * inopportune ENOMEM later. */ static struct ceph_mds_request * prepare_open_request(struct super_block *sb, int flags, int create_mode) { struct ceph_fs_client *fsc = ceph_sb_to_client(sb); struct ceph_mds_client *mdsc = fsc->mdsc; struct ceph_mds_request *req; int want_auth = USE_ANY_MDS; int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) want_auth = USE_AUTH_MDS; req = ceph_mdsc_create_request(mdsc, op, want_auth); if (IS_ERR(req)) goto out; req->r_fmode = ceph_flags_to_mode(flags); req->r_args.open.flags = ceph_flags_sys2wire(flags); req->r_args.open.mode = cpu_to_le32(create_mode); out: return req; } /* * initialize private struct file data. * if we fail, clean up by dropping fmode reference on the ceph_inode */ static int ceph_init_file(struct inode *inode, struct file *file, int fmode) { struct ceph_file_info *cf; int ret = 0; switch (inode->i_mode & S_IFMT) { case S_IFREG: ceph_fscache_register_inode_cookie(inode); ceph_fscache_file_set_cookie(inode, file); case S_IFDIR: dout("init_file %p %p 0%o (regular)\n", inode, file, inode->i_mode); cf = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL); if (cf == NULL) { ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ return -ENOMEM; } cf->fmode = fmode; cf->next_offset = 2; cf->readdir_cache_idx = -1; file->private_data = cf; BUG_ON(inode->i_fop->release != ceph_release); break; case S_IFLNK: dout("init_file %p %p 0%o (symlink)\n", inode, file, inode->i_mode); ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ break; default: dout("init_file %p %p 0%o (special)\n", inode, file, inode->i_mode); /* * we need to drop the open ref now, since we don't * have .release set to ceph_release. */ ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ BUG_ON(inode->i_fop->release == ceph_release); /* call the proper open fop */ ret = inode->i_fop->open(inode, file); } return ret; } /* * try renew caps after session gets killed. */ int ceph_renew_caps(struct inode *inode) { struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_mds_request *req; int err, flags, wanted; spin_lock(&ci->i_ceph_lock); wanted = __ceph_caps_file_wanted(ci); if (__ceph_is_any_real_caps(ci) && (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) { int issued = __ceph_caps_issued(ci, NULL); spin_unlock(&ci->i_ceph_lock); dout("renew caps %p want %s issued %s updating mds_wanted\n", inode, ceph_cap_string(wanted), ceph_cap_string(issued)); ceph_check_caps(ci, 0, NULL); return 0; } spin_unlock(&ci->i_ceph_lock); flags = 0; if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR)) flags = O_RDWR; else if (wanted & CEPH_CAP_FILE_RD) flags = O_RDONLY; else if (wanted & CEPH_CAP_FILE_WR) flags = O_WRONLY; #ifdef O_LAZY if (wanted & CEPH_CAP_FILE_LAZYIO) flags |= O_LAZY; #endif req = prepare_open_request(inode->i_sb, flags, 0); if (IS_ERR(req)) { err = PTR_ERR(req); goto out; } req->r_inode = inode; ihold(inode); req->r_num_caps = 1; req->r_fmode = -1; err = ceph_mdsc_do_request(mdsc, NULL, req); ceph_mdsc_put_request(req); out: dout("renew caps %p open result=%d\n", inode, err); return err < 0 ? err : 0; } /* * If we already have the requisite capabilities, we can satisfy * the open request locally (no need to request new caps from the * MDS). We do, however, need to inform the MDS (asynchronously) * if our wanted caps set expands. */ int ceph_open(struct inode *inode, struct file *file) { struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); struct ceph_mds_client *mdsc = fsc->mdsc; struct ceph_mds_request *req; struct ceph_file_info *cf = file->private_data; int err; int flags, fmode, wanted; if (cf) { dout("open file %p is already opened\n", file); return 0; } /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ flags = file->f_flags & ~(O_CREAT|O_EXCL); if (S_ISDIR(inode->i_mode)) flags = O_DIRECTORY; /* mds likes to know */ dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, ceph_vinop(inode), file, flags, file->f_flags); fmode = ceph_flags_to_mode(flags); wanted = ceph_caps_for_mode(fmode); /* snapped files are read-only */ if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) return -EROFS; /* trivially open snapdir */ if (ceph_snap(inode) == CEPH_SNAPDIR) { spin_lock(&ci->i_ceph_lock); __ceph_get_fmode(ci, fmode); spin_unlock(&ci->i_ceph_lock); return ceph_init_file(inode, file, fmode); } /* * No need to block if we have caps on the auth MDS (for * write) or any MDS (for read). Update wanted set * asynchronously. */ spin_lock(&ci->i_ceph_lock); if (__ceph_is_any_real_caps(ci) && (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { int mds_wanted = __ceph_caps_mds_wanted(ci, true); int issued = __ceph_caps_issued(ci, NULL); dout("open %p fmode %d want %s issued %s using existing\n", inode, fmode, ceph_cap_string(wanted), ceph_cap_string(issued)); __ceph_get_fmode(ci, fmode); spin_unlock(&ci->i_ceph_lock); /* adjust wanted? */ if ((issued & wanted) != wanted && (mds_wanted & wanted) != wanted && ceph_snap(inode) != CEPH_SNAPDIR) ceph_check_caps(ci, 0, NULL); return ceph_init_file(inode, file, fmode); } else if (ceph_snap(inode) != CEPH_NOSNAP && (ci->i_snap_caps & wanted) == wanted) { __ceph_get_fmode(ci, fmode); spin_unlock(&ci->i_ceph_lock); return ceph_init_file(inode, file, fmode); } spin_unlock(&ci->i_ceph_lock); dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); req = prepare_open_request(inode->i_sb, flags, 0); if (IS_ERR(req)) { err = PTR_ERR(req); goto out; } req->r_inode = inode; ihold(inode); req->r_num_caps = 1; err = ceph_mdsc_do_request(mdsc, NULL, req); if (!err) err = ceph_init_file(inode, file, req->r_fmode); ceph_mdsc_put_request(req); dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); out: return err; } /* * Do a lookup + open with a single request. If we get a non-existent * file or symlink, return 1 so the VFS can retry. */ int ceph_atomic_open(struct inode *dir, struct dentry *dentry, struct file *file, unsigned flags, umode_t mode, int *opened) { struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); struct ceph_mds_client *mdsc = fsc->mdsc; struct ceph_mds_request *req; struct dentry *dn; struct ceph_acls_info acls = {}; int mask; int err; dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n", dir, dentry, dentry, d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); if (dentry->d_name.len > NAME_MAX) return -ENAMETOOLONG; if (flags & O_CREAT) { err = ceph_pre_init_acls(dir, &mode, &acls); if (err < 0) return err; } /* do the open */ req = prepare_open_request(dir->i_sb, flags, mode); if (IS_ERR(req)) { err = PTR_ERR(req); goto out_acl; } req->r_dentry = dget(dentry); req->r_num_caps = 2; if (flags & O_CREAT) { req->r_dentry_drop = CEPH_CAP_FILE_SHARED; req->r_dentry_unless = CEPH_CAP_FILE_EXCL; if (acls.pagelist) { req->r_pagelist = acls.pagelist; acls.pagelist = NULL; } } mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; if (ceph_security_xattr_wanted(dir)) mask |= CEPH_CAP_XATTR_SHARED; req->r_args.open.mask = cpu_to_le32(mask); req->r_parent = dir; set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); err = ceph_mdsc_do_request(mdsc, (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, req); err = ceph_handle_snapdir(req, dentry, err); if (err) goto out_req; if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry) err = ceph_handle_notrace_create(dir, dentry); if (d_in_lookup(dentry)) { dn = ceph_finish_lookup(req, dentry, err); if (IS_ERR(dn)) err = PTR_ERR(dn); } else { /* we were given a hashed negative dentry */ dn = NULL; } if (err) goto out_req; if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) { /* make vfs retry on splice, ENOENT, or symlink */ dout("atomic_open finish_no_open on dn %p\n", dn); err = finish_no_open(file, dn); } else { dout("atomic_open finish_open on dn %p\n", dn); if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { ceph_init_inode_acls(d_inode(dentry), &acls); *opened |= FILE_CREATED; } err = finish_open(file, dentry, ceph_open, opened); } out_req: if (!req->r_err && req->r_target_inode) ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode); ceph_mdsc_put_request(req); out_acl: ceph_release_acls_info(&acls); dout("atomic_open result=%d\n", err); return err; } int ceph_release(struct inode *inode, struct file *file) { struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_file_info *cf = file->private_data; dout("release inode %p file %p\n", inode, file); ceph_put_fmode(ci, cf->fmode); if (cf->last_readdir) ceph_mdsc_put_request(cf->last_readdir); kfree(cf->last_name); kfree(cf->dir_info); kmem_cache_free(ceph_file_cachep, cf); /* wake up anyone waiting for caps on this inode */ wake_up_all(&ci->i_cap_wq); return 0; } enum { HAVE_RETRIED = 1, CHECK_EOF = 2, READ_INLINE = 3, }; /* * Read a range of bytes striped over one or more objects. Iterate over * objects we stripe over. (That's not atomic, but good enough for now.) * * If we get a short result from the OSD, check against i_size; we need to * only return a short read to the caller if we hit EOF. */ static int striped_read(struct inode *inode, u64 pos, u64 len, struct page **pages, int num_pages, int page_align, int *checkeof) { struct ceph_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_inode_info *ci = ceph_inode(inode); u64 this_len; loff_t i_size; int page_idx; int ret, read = 0; bool hit_stripe, was_short; /* * we may need to do multiple reads. not atomic, unfortunately. */ more: this_len = len; page_idx = (page_align + read) >> PAGE_SHIFT; ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), &ci->i_layout, pos, &this_len, ci->i_truncate_seq, ci->i_truncate_size, pages + page_idx, num_pages - page_idx, ((page_align + read) & ~PAGE_MASK)); if (ret == -ENOENT) ret = 0; hit_stripe = this_len < len; was_short = ret >= 0 && ret < this_len; dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, len, read, ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); i_size = i_size_read(inode); if (ret >= 0) { if (was_short && (pos + ret < i_size)) { int zlen = min(this_len - ret, i_size - pos - ret); int zoff = page_align + read + ret; dout(" zero gap %llu to %llu\n", pos + ret, pos + ret + zlen); ceph_zero_page_vector_range(zoff, zlen, pages); ret += zlen; } read += ret; pos += ret; len -= ret; /* hit stripe and need continue*/ if (len && hit_stripe && pos < i_size) goto more; } if (read > 0) { ret = read; /* did we bounce off eof? */ if (pos + len > i_size) *checkeof = CHECK_EOF; } dout("striped_read returns %d\n", ret); return ret; } /* * Completely synchronous read and write methods. Direct from __user * buffer to osd, or directly to user pages (if O_DIRECT). * * If the read spans object boundary, just do multiple reads. */ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to, int *checkeof) { struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); struct page **pages; u64 off = iocb->ki_pos; int num_pages; ssize_t ret; size_t len = iov_iter_count(to); dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len, (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); if (!len) return 0; /* * flush any page cache pages in this range. this * will make concurrent normal and sync io slow, * but it will at least behave sensibly when they are * in sequence. */ ret = filemap_write_and_wait_range(inode->i_mapping, off, off + len); if (ret < 0) return ret; if (unlikely(to->type & ITER_PIPE)) { size_t page_off; ret = iov_iter_get_pages_alloc(to, &pages, len, &page_off); if (ret <= 0) return -ENOMEM; num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE); ret = striped_read(inode, off, ret, pages, num_pages, page_off, checkeof); if (ret > 0) { iov_iter_advance(to, ret); off += ret; } else { iov_iter_advance(to, 0); } ceph_put_page_vector(pages, num_pages, false); } else { num_pages = calc_pages_for(off, len); pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); if (IS_ERR(pages)) return PTR_ERR(pages); ret = striped_read(inode, off, len, pages, num_pages, (off & ~PAGE_MASK), checkeof); if (ret > 0) { int l, k = 0; size_t left = ret; while (left) { size_t page_off = off & ~PAGE_MASK; size_t copy = min_t(size_t, left, PAGE_SIZE - page_off); l = copy_page_to_iter(pages[k++], page_off, copy, to); off += l; left -= l; if (l < copy) break; } } ceph_release_page_vector(pages, num_pages); } if (off > iocb->ki_pos) { ret = off - iocb->ki_pos; iocb->ki_pos = off; } dout("sync_read result %zd\n", ret); return ret; } struct ceph_aio_request { struct kiocb *iocb; size_t total_len; int write; int error; struct list_head osd_reqs; unsigned num_reqs; atomic_t pending_reqs; struct timespec mtime; struct ceph_cap_flush *prealloc_cf; }; struct ceph_aio_work { struct work_struct work; struct ceph_osd_request *req; }; static void ceph_aio_retry_work(struct work_struct *work); static void ceph_aio_complete(struct inode *inode, struct ceph_aio_request *aio_req) { struct ceph_inode_info *ci = ceph_inode(inode); int ret; if (!atomic_dec_and_test(&aio_req->pending_reqs)) return; ret = aio_req->error; if (!ret) ret = aio_req->total_len; dout("ceph_aio_complete %p rc %d\n", inode, ret); if (ret >= 0 && aio_req->write) { int dirty; loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len; if (endoff > i_size_read(inode)) { if (ceph_inode_set_size(inode, endoff)) ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); } spin_lock(&ci->i_ceph_lock); ci->i_inline_version = CEPH_INLINE_NONE; dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &aio_req->prealloc_cf); spin_unlock(&ci->i_ceph_lock); if (dirty) __mark_inode_dirty(inode, dirty); } ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR : CEPH_CAP_FILE_RD)); aio_req->iocb->ki_complete(aio_req->iocb, ret, 0); ceph_free_cap_flush(aio_req->prealloc_cf); kfree(aio_req); } static void ceph_aio_complete_req(struct ceph_osd_request *req) { int rc = req->r_result; struct inode *inode = req->r_inode; struct ceph_aio_request *aio_req = req->r_priv; struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0); int num_pages = calc_pages_for((u64)osd_data->alignment, osd_data->length); dout("ceph_aio_complete_req %p rc %d bytes %llu\n", inode, rc, osd_data->length); if (rc == -EOLDSNAPC) { struct ceph_aio_work *aio_work; BUG_ON(!aio_req->write); aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS); if (aio_work) { INIT_WORK(&aio_work->work, ceph_aio_retry_work); aio_work->req = req; queue_work(ceph_inode_to_client(inode)->wb_wq, &aio_work->work); return; } rc = -ENOMEM; } else if (!aio_req->write) { if (rc == -ENOENT) rc = 0; if (rc >= 0 && osd_data->length > rc) { int zoff = osd_data->alignment + rc; int zlen = osd_data->length - rc; /* * If read is satisfied by single OSD request, * it can pass EOF. Otherwise read is within * i_size. */ if (aio_req->num_reqs == 1) { loff_t i_size = i_size_read(inode); loff_t endoff = aio_req->iocb->ki_pos + rc; if (endoff < i_size) zlen = min_t(size_t, zlen, i_size - endoff); aio_req->total_len = rc + zlen; } if (zlen > 0) ceph_zero_page_vector_range(zoff, zlen, osd_data->pages); } } ceph_put_page_vector(osd_data->pages, num_pages, !aio_req->write); ceph_osdc_put_request(req); if (rc < 0) cmpxchg(&aio_req->error, 0, rc); ceph_aio_complete(inode, aio_req); return; } static void ceph_aio_retry_work(struct work_struct *work) { struct ceph_aio_work *aio_work = container_of(work, struct ceph_aio_work, work); struct ceph_osd_request *orig_req = aio_work->req; struct ceph_aio_request *aio_req = orig_req->r_priv; struct inode *inode = orig_req->r_inode; struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_snap_context *snapc; struct ceph_osd_request *req; int ret; spin_lock(&ci->i_ceph_lock); if (__ceph_have_pending_cap_snap(ci)) { struct ceph_cap_snap *capsnap = list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap, ci_item); snapc = ceph_get_snap_context(capsnap->context); } else { BUG_ON(!ci->i_head_snapc); snapc = ceph_get_snap_context(ci->i_head_snapc); } spin_unlock(&ci->i_ceph_lock); req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2, false, GFP_NOFS); if (!req) { ret = -ENOMEM; req = orig_req; goto out; } req->r_flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_WRITE; ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc); ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid); ret = ceph_osdc_alloc_messages(req, GFP_NOFS); if (ret) { ceph_osdc_put_request(req); req = orig_req; goto out; } req->r_ops[0] = orig_req->r_ops[0]; osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0); req->r_mtime = aio_req->mtime; req->r_data_offset = req->r_ops[0].extent.offset; ceph_osdc_put_request(orig_req); req->r_callback = ceph_aio_complete_req; req->r_inode = inode; req->r_priv = aio_req; req->r_abort_on_full = true; ret = ceph_osdc_start_request(req->r_osdc, req, false); out: if (ret < 0) { req->r_result = ret; ceph_aio_complete_req(req); } ceph_put_snap_context(snapc); kfree(aio_work); } static ssize_t ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, struct ceph_snap_context *snapc, struct ceph_cap_flush **pcf) { struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_vino vino; struct ceph_osd_request *req; struct page **pages; struct ceph_aio_request *aio_req = NULL; int num_pages = 0; int flags; int ret; struct timespec mtime = current_time(inode); size_t count = iov_iter_count(iter); loff_t pos = iocb->ki_pos; bool write = iov_iter_rw(iter) == WRITE; if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP) return -EROFS; dout("sync_direct_read_write (%s) on file %p %lld~%u\n", (write ? "write" : "read"), file, pos, (unsigned)count); ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); if (ret < 0) return ret; if (write) { int ret2 = invalidate_inode_pages2_range(inode->i_mapping, pos >> PAGE_SHIFT, (pos + count) >> PAGE_SHIFT); if (ret2 < 0) dout("invalidate_inode_pages2_range returned %d\n", ret2); flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_WRITE; } else { flags = CEPH_OSD_FLAG_READ; } while (iov_iter_count(iter) > 0) { u64 size = dio_get_pagev_size(iter); size_t start = 0; ssize_t len; vino = ceph_vino(inode); req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, pos, &size, 0, /*include a 'startsync' command*/ write ? 2 : 1, write ? CEPH_OSD_OP_WRITE : CEPH_OSD_OP_READ, flags, snapc, ci->i_truncate_seq, ci->i_truncate_size, false); if (IS_ERR(req)) { ret = PTR_ERR(req); break; } len = size; pages = dio_get_pages_alloc(iter, len, &start, &num_pages); if (IS_ERR(pages)) { ceph_osdc_put_request(req); ret = PTR_ERR(pages); break; } /* * To simplify error handling, allow AIO when IO within i_size * or IO can be satisfied by single OSD request. */ if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) && (len == count || pos + count <= i_size_read(inode))) { aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL); if (aio_req) { aio_req->iocb = iocb; aio_req->write = write; INIT_LIST_HEAD(&aio_req->osd_reqs); if (write) { aio_req->mtime = mtime; swap(aio_req->prealloc_cf, *pcf); } } /* ignore error */ } if (write) { /* * throw out any page cache pages in this range. this * may block. */ truncate_inode_pages_range(inode->i_mapping, pos, (pos+len) | (PAGE_SIZE - 1)); osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0); req->r_mtime = mtime; } osd_req_op_extent_osd_data_pages(req, 0, pages, len, start, false, false); if (aio_req) { aio_req->total_len += len; aio_req->num_reqs++; atomic_inc(&aio_req->pending_reqs); req->r_callback = ceph_aio_complete_req; req->r_inode = inode; req->r_priv = aio_req; list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs); pos += len; iov_iter_advance(iter, len); continue; } ret = ceph_osdc_start_request(req->r_osdc, req, false); if (!ret) ret = ceph_osdc_wait_request(&fsc->client->osdc, req); size = i_size_read(inode); if (!write) { if (ret == -ENOENT) ret = 0; if (ret >= 0 && ret < len && pos + ret < size) { int zlen = min_t(size_t, len - ret, size - pos - ret); ceph_zero_page_vector_range(start + ret, zlen, pages); ret += zlen; } if (ret >= 0) len = ret; } ceph_put_page_vector(pages, num_pages, !write); ceph_osdc_put_request(req); if (ret < 0) break; pos += len; iov_iter_advance(iter, len); if (!write && pos >= size) break; if (write && pos > size) { if (ceph_inode_set_size(inode, pos)) ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); } } if (aio_req) { LIST_HEAD(osd_reqs); if (aio_req->num_reqs == 0) { kfree(aio_req); return ret; } ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR : CEPH_CAP_FILE_RD); list_splice(&aio_req->osd_reqs, &osd_reqs); while (!list_empty(&osd_reqs)) { req = list_first_entry(&osd_reqs, struct ceph_osd_request, r_unsafe_item); list_del_init(&req->r_unsafe_item); if (ret >= 0) ret = ceph_osdc_start_request(req->r_osdc, req, false); if (ret < 0) { req->r_result = ret; ceph_aio_complete_req(req); } } return -EIOCBQUEUED; } if (ret != -EOLDSNAPC && pos > iocb->ki_pos) { ret = pos - iocb->ki_pos; iocb->ki_pos = pos; } return ret; } /* * Synchronous write, straight from __user pointer or user pages. * * If write spans object boundary, just do multiple writes. (For a * correct atomic write, we should e.g. take write locks on all * objects, rollback on failure, etc.) */ static ssize_t ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, struct ceph_snap_context *snapc) { struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_vino vino; struct ceph_osd_request *req; struct page **pages; u64 len; int num_pages; int written = 0; int flags; int check_caps = 0; int ret; struct timespec mtime = current_time(inode); size_t count = iov_iter_count(from); if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) return -EROFS; dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count); ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); if (ret < 0) return ret; ret = invalidate_inode_pages2_range(inode->i_mapping, pos >> PAGE_SHIFT, (pos + count) >> PAGE_SHIFT); if (ret < 0) dout("invalidate_inode_pages2_range returned %d\n", ret); flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_WRITE; while ((len = iov_iter_count(from)) > 0) { size_t left; int n; vino = ceph_vino(inode); req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, pos, &len, 0, 1, CEPH_OSD_OP_WRITE, flags, snapc, ci->i_truncate_seq, ci->i_truncate_size, false); if (IS_ERR(req)) { ret = PTR_ERR(req); break; } /* * write from beginning of first page, * regardless of io alignment */ num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); if (IS_ERR(pages)) { ret = PTR_ERR(pages); goto out; } left = len; for (n = 0; n < num_pages; n++) { size_t plen = min_t(size_t, left, PAGE_SIZE); ret = copy_page_from_iter(pages[n], 0, plen, from); if (ret != plen) { ret = -EFAULT; break; } left -= ret; } if (ret < 0) { ceph_release_page_vector(pages, num_pages); goto out; } req->r_inode = inode; osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, true); req->r_mtime = mtime; ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); if (!ret) ret = ceph_osdc_wait_request(&fsc->client->osdc, req); out: ceph_osdc_put_request(req); if (ret != 0) { ceph_set_error_write(ci); break; } ceph_clear_error_write(ci); pos += len; written += len; if (pos > i_size_read(inode)) { check_caps = ceph_inode_set_size(inode, pos); if (check_caps) ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); } } if (ret != -EOLDSNAPC && written > 0) { ret = written; iocb->ki_pos = pos; } return ret; } /* * Wrap generic_file_aio_read with checks for cap bits on the inode. * Atomically grab references, so that those bits are not released * back to the MDS mid-read. * * Hmm, the sync read case isn't actually async... should it be? */ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) { struct file *filp = iocb->ki_filp; struct ceph_file_info *fi = filp->private_data; size_t len = iov_iter_count(to); struct inode *inode = file_inode(filp); struct ceph_inode_info *ci = ceph_inode(inode); struct page *pinned_page = NULL; ssize_t ret; int want, got = 0; int retry_op = 0, read = 0; again: dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); if (fi->fmode & CEPH_FILE_MODE_LAZY) want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; else want = CEPH_CAP_FILE_CACHE; ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); if (ret < 0) return ret; if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) { dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n", inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, ceph_cap_string(got)); if (ci->i_inline_version == CEPH_INLINE_NONE) { if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) { ret = ceph_direct_read_write(iocb, to, NULL, NULL); if (ret >= 0 && ret < len) retry_op = CHECK_EOF; } else { ret = ceph_sync_read(iocb, to, &retry_op); } } else { retry_op = READ_INLINE; } } else { dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, ceph_cap_string(got)); current->journal_info = filp; ret = generic_file_read_iter(iocb, to); current->journal_info = NULL; } dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); if (pinned_page) { put_page(pinned_page); pinned_page = NULL; } ceph_put_cap_refs(ci, got); if (retry_op > HAVE_RETRIED && ret >= 0) { int statret; struct page *page = NULL; loff_t i_size; if (retry_op == READ_INLINE) { page = __page_cache_alloc(GFP_KERNEL); if (!page) return -ENOMEM; } statret = __ceph_do_getattr(inode, page, CEPH_STAT_CAP_INLINE_DATA, !!page); if (statret < 0) { if (page) __free_page(page); if (statret == -ENODATA) { BUG_ON(retry_op != READ_INLINE); goto again; } return statret; } i_size = i_size_read(inode); if (retry_op == READ_INLINE) { BUG_ON(ret > 0 || read > 0); if (iocb->ki_pos < i_size && iocb->ki_pos < PAGE_SIZE) { loff_t end = min_t(loff_t, i_size, iocb->ki_pos + len); end = min_t(loff_t, end, PAGE_SIZE); if (statret < end) zero_user_segment(page, statret, end); ret = copy_page_to_iter(page, iocb->ki_pos & ~PAGE_MASK, end - iocb->ki_pos, to); iocb->ki_pos += ret; read += ret; } if (iocb->ki_pos < i_size && read < len) { size_t zlen = min_t(size_t, len - read, i_size - iocb->ki_pos); ret = iov_iter_zero(zlen, to); iocb->ki_pos += ret; read += ret; } __free_pages(page, 0); return read; } /* hit EOF or hole? */ if (retry_op == CHECK_EOF && iocb->ki_pos < i_size && ret < len) { dout("sync_read hit hole, ppos %lld < size %lld" ", reading more\n", iocb->ki_pos, i_size); read += ret; len -= ret; retry_op = HAVE_RETRIED; goto again; } } if (ret >= 0) ret += read; return ret; } /* * Take cap references to avoid releasing caps to MDS mid-write. * * If we are synchronous, and write with an old snap context, the OSD * may return EOLDSNAPC. In that case, retry the write.. _after_ * dropping our cap refs and allowing the pending snap to logically * complete _before_ this write occurs. * * If we are near ENOSPC, write synchronously. */ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) { struct file *file = iocb->ki_filp; struct ceph_file_info *fi = file->private_data; struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_osd_client *osdc = &ceph_sb_to_client(inode->i_sb)->client->osdc; struct ceph_cap_flush *prealloc_cf; ssize_t count, written = 0; int err, want, got; loff_t pos; if (ceph_snap(inode) != CEPH_NOSNAP) return -EROFS; prealloc_cf = ceph_alloc_cap_flush(); if (!prealloc_cf) return -ENOMEM; inode_lock(inode); /* We can write back this queue in page reclaim */ current->backing_dev_info = inode_to_bdi(inode); if (iocb->ki_flags & IOCB_APPEND) { err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); if (err < 0) goto out; } err = generic_write_checks(iocb, from); if (err <= 0) goto out; pos = iocb->ki_pos; count = iov_iter_count(from); err = file_remove_privs(file); if (err) goto out; err = file_update_time(file); if (err) goto out; if (ci->i_inline_version != CEPH_INLINE_NONE) { err = ceph_uninline_data(file, NULL); if (err < 0) goto out; } retry_snap: /* FIXME: not complete since it doesn't account for being at quota */ if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL)) { err = -ENOSPC; goto out; } dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", inode, ceph_vinop(inode), pos, count, i_size_read(inode)); if (fi->fmode & CEPH_FILE_MODE_LAZY) want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; else want = CEPH_CAP_FILE_BUFFER; got = 0; err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count, &got, NULL); if (err < 0) goto out; dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) || (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) { struct ceph_snap_context *snapc; struct iov_iter data; inode_unlock(inode); spin_lock(&ci->i_ceph_lock); if (__ceph_have_pending_cap_snap(ci)) { struct ceph_cap_snap *capsnap = list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap, ci_item); snapc = ceph_get_snap_context(capsnap->context); } else { BUG_ON(!ci->i_head_snapc); snapc = ceph_get_snap_context(ci->i_head_snapc); } spin_unlock(&ci->i_ceph_lock); /* we might need to revert back to that point */ data = *from; if (iocb->ki_flags & IOCB_DIRECT) written = ceph_direct_read_write(iocb, &data, snapc, &prealloc_cf); else written = ceph_sync_write(iocb, &data, pos, snapc); if (written == -EOLDSNAPC) { dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n", inode, ceph_vinop(inode), pos, (unsigned)count); inode_lock(inode); goto retry_snap; } if (written > 0) iov_iter_advance(from, written); ceph_put_snap_context(snapc); } else { /* * No need to acquire the i_truncate_mutex. Because * the MDS revokes Fwb caps before sending truncate * message to us. We can't get Fwb cap while there * are pending vmtruncate. So write and vmtruncate * can not run at the same time */ written = generic_perform_write(file, from, pos); if (likely(written >= 0)) iocb->ki_pos = pos + written; inode_unlock(inode); } if (written >= 0) { int dirty; spin_lock(&ci->i_ceph_lock); ci->i_inline_version = CEPH_INLINE_NONE; dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf); spin_unlock(&ci->i_ceph_lock); if (dirty) __mark_inode_dirty(inode, dirty); } dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", inode, ceph_vinop(inode), pos, (unsigned)count, ceph_cap_string(got)); ceph_put_cap_refs(ci, got); if (written >= 0) { if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_NEARFULL)) iocb->ki_flags |= IOCB_DSYNC; written = generic_write_sync(iocb, written); } goto out_unlocked; out: inode_unlock(inode); out_unlocked: ceph_free_cap_flush(prealloc_cf); current->backing_dev_info = NULL; return written ? written : err; } /* * llseek. be sure to verify file size on SEEK_END. */ static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) { struct inode *inode = file->f_mapping->host; loff_t i_size; loff_t ret; inode_lock(inode); if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); if (ret < 0) goto out; } i_size = i_size_read(inode); switch (whence) { case SEEK_END: offset += i_size; break; case SEEK_CUR: /* * Here we special-case the lseek(fd, 0, SEEK_CUR) * position-querying operation. Avoid rewriting the "same" * f_pos value back to the file because a concurrent read(), * write() or lseek() might have altered it */ if (offset == 0) { ret = file->f_pos; goto out; } offset += file->f_pos; break; case SEEK_DATA: if (offset >= i_size) { ret = -ENXIO; goto out; } break; case SEEK_HOLE: if (offset >= i_size) { ret = -ENXIO; goto out; } offset = i_size; break; } ret = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); out: inode_unlock(inode); return ret; } static inline void ceph_zero_partial_page( struct inode *inode, loff_t offset, unsigned size) { struct page *page; pgoff_t index = offset >> PAGE_SHIFT; page = find_lock_page(inode->i_mapping, index); if (page) { wait_on_page_writeback(page); zero_user(page, offset & (PAGE_SIZE - 1), size); unlock_page(page); put_page(page); } } static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, loff_t length) { loff_t nearly = round_up(offset, PAGE_SIZE); if (offset < nearly) { loff_t size = nearly - offset; if (length < size) size = length; ceph_zero_partial_page(inode, offset, size); offset += size; length -= size; } if (length >= PAGE_SIZE) { loff_t size = round_down(length, PAGE_SIZE); truncate_pagecache_range(inode, offset, offset + size - 1); offset += size; length -= size; } if (length) ceph_zero_partial_page(inode, offset, length); } static int ceph_zero_partial_object(struct inode *inode, loff_t offset, loff_t *length) { struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_osd_request *req; int ret = 0; loff_t zero = 0; int op; if (!length) { op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; length = &zero; } else { op = CEPH_OSD_OP_ZERO; } req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, ceph_vino(inode), offset, length, 0, 1, op, CEPH_OSD_FLAG_WRITE, NULL, 0, 0, false); if (IS_ERR(req)) { ret = PTR_ERR(req); goto out; } req->r_mtime = inode->i_mtime; ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); if (!ret) { ret = ceph_osdc_wait_request(&fsc->client->osdc, req); if (ret == -ENOENT) ret = 0; } ceph_osdc_put_request(req); out: return ret; } static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) { int ret = 0; struct ceph_inode_info *ci = ceph_inode(inode); s32 stripe_unit = ci->i_layout.stripe_unit; s32 stripe_count = ci->i_layout.stripe_count; s32 object_size = ci->i_layout.object_size; u64 object_set_size = object_size * stripe_count; u64 nearly, t; /* round offset up to next period boundary */ nearly = offset + object_set_size - 1; t = nearly; nearly -= do_div(t, object_set_size); while (length && offset < nearly) { loff_t size = length; ret = ceph_zero_partial_object(inode, offset, &size); if (ret < 0) return ret; offset += size; length -= size; } while (length >= object_set_size) { int i; loff_t pos = offset; for (i = 0; i < stripe_count; ++i) { ret = ceph_zero_partial_object(inode, pos, NULL); if (ret < 0) return ret; pos += stripe_unit; } offset += object_set_size; length -= object_set_size; } while (length) { loff_t size = length; ret = ceph_zero_partial_object(inode, offset, &size); if (ret < 0) return ret; offset += size; length -= size; } return ret; } static long ceph_fallocate(struct file *file, int mode, loff_t offset, loff_t length) { struct ceph_file_info *fi = file->private_data; struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_osd_client *osdc = &ceph_inode_to_client(inode)->client->osdc; struct ceph_cap_flush *prealloc_cf; int want, got = 0; int dirty; int ret = 0; loff_t endoff = 0; loff_t size; if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) return -EOPNOTSUPP; if (!S_ISREG(inode->i_mode)) return -EOPNOTSUPP; prealloc_cf = ceph_alloc_cap_flush(); if (!prealloc_cf) return -ENOMEM; inode_lock(inode); if (ceph_snap(inode) != CEPH_NOSNAP) { ret = -EROFS; goto unlock; } if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) && !(mode & FALLOC_FL_PUNCH_HOLE)) { ret = -ENOSPC; goto unlock; } if (ci->i_inline_version != CEPH_INLINE_NONE) { ret = ceph_uninline_data(file, NULL); if (ret < 0) goto unlock; } size = i_size_read(inode); if (!(mode & FALLOC_FL_KEEP_SIZE)) { endoff = offset + length; ret = inode_newsize_ok(inode, endoff); if (ret) goto unlock; } if (fi->fmode & CEPH_FILE_MODE_LAZY) want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; else want = CEPH_CAP_FILE_BUFFER; ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL); if (ret < 0) goto unlock; if (mode & FALLOC_FL_PUNCH_HOLE) { if (offset < size) ceph_zero_pagecache_range(inode, offset, length); ret = ceph_zero_objects(inode, offset, length); } else if (endoff > size) { truncate_pagecache_range(inode, size, -1); if (ceph_inode_set_size(inode, endoff)) ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); } if (!ret) { spin_lock(&ci->i_ceph_lock); ci->i_inline_version = CEPH_INLINE_NONE; dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf); spin_unlock(&ci->i_ceph_lock); if (dirty) __mark_inode_dirty(inode, dirty); } ceph_put_cap_refs(ci, got); unlock: inode_unlock(inode); ceph_free_cap_flush(prealloc_cf); return ret; } const struct file_operations ceph_file_fops = { .open = ceph_open, .release = ceph_release, .llseek = ceph_llseek, .read_iter = ceph_read_iter, .write_iter = ceph_write_iter, .mmap = ceph_mmap, .fsync = ceph_fsync, .lock = ceph_lock, .flock = ceph_flock, .splice_read = generic_file_splice_read, .splice_write = iter_file_splice_write, .unlocked_ioctl = ceph_ioctl, .compat_ioctl = ceph_ioctl, .fallocate = ceph_fallocate, }; |