// SPDX-License-Identifier: GPL-2.0 #include <linux/ceph/ceph_debug.h> #include <linux/ceph/striper.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 <linux/iversion.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; } flags &= ~O_ACCMODE; #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\n", 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. */ /* * How many pages to get in one call to iov_iter_get_pages(). This * determines the size of the on-stack array used as a buffer. */ #define ITER_GET_BVECS_PAGES 64 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize, struct bio_vec *bvecs) { size_t size = 0; int bvec_idx = 0; if (maxsize > iov_iter_count(iter)) maxsize = iov_iter_count(iter); while (size < maxsize) { struct page *pages[ITER_GET_BVECS_PAGES]; ssize_t bytes; size_t start; int idx = 0; bytes = iov_iter_get_pages(iter, pages, maxsize - size, ITER_GET_BVECS_PAGES, &start); if (bytes < 0) return size ?: bytes; iov_iter_advance(iter, bytes); size += bytes; for ( ; bytes; idx++, bvec_idx++) { struct bio_vec bv = { .bv_page = pages[idx], .bv_len = min_t(int, bytes, PAGE_SIZE - start), .bv_offset = start, }; bvecs[bvec_idx] = bv; bytes -= bv.bv_len; start = 0; } } return size; } /* * iov_iter_get_pages() only considers one iov_iter segment, no matter * what maxsize or maxpages are given. For ITER_BVEC that is a single * page. * * Attempt to get up to @maxsize bytes worth of pages from @iter. * Return the number of bytes in the created bio_vec array, or an error. */ static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize, struct bio_vec **bvecs, int *num_bvecs) { struct bio_vec *bv; size_t orig_count = iov_iter_count(iter); ssize_t bytes; int npages; iov_iter_truncate(iter, maxsize); npages = iov_iter_npages(iter, INT_MAX); iov_iter_reexpand(iter, orig_count); /* * __iter_get_bvecs() may populate only part of the array -- zero it * out. */ bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO); if (!bv) return -ENOMEM; bytes = __iter_get_bvecs(iter, maxsize, bv); if (bytes < 0) { /* * No pages were pinned -- just free the array. */ kvfree(bv); return bytes; } *bvecs = bv; *num_bvecs = npages; return bytes; } static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty) { int i; for (i = 0; i < num_bvecs; i++) { if (bvecs[i].bv_page) { if (should_dirty) set_page_dirty_lock(bvecs[i].bv_page); put_page(bvecs[i].bv_page); } } kvfree(bvecs); } /* * 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; } static int ceph_init_file_info(struct inode *inode, struct file *file, int fmode, bool isdir) { struct ceph_file_info *fi; dout("%s %p %p 0%o (%s)\n", __func__, inode, file, inode->i_mode, isdir ? "dir" : "regular"); BUG_ON(inode->i_fop->release != ceph_release); if (isdir) { struct ceph_dir_file_info *dfi = kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL); if (!dfi) { ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ return -ENOMEM; } file->private_data = dfi; fi = &dfi->file_info; dfi->next_offset = 2; dfi->readdir_cache_idx = -1; } else { fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL); if (!fi) { ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ return -ENOMEM; } file->private_data = fi; } fi->fmode = fmode; spin_lock_init(&fi->rw_contexts_lock); INIT_LIST_HEAD(&fi->rw_contexts); return 0; } /* * 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) { 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); /* fall through */ case S_IFDIR: ret = ceph_init_file_info(inode, file, fmode, S_ISDIR(inode->i_mode)); if (ret) return ret; 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 *fi = file->private_data; int err; int flags, fmode, wanted; if (fi) { 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) { 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_acl_sec_ctx as_ctx = {}; 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) { if (ceph_quota_is_max_files_exceeded(dir)) return -EDQUOT; err = ceph_pre_init_acls(dir, &mode, &as_ctx); if (err < 0) return err; err = ceph_security_init_secctx(dentry, mode, &as_ctx); if (err < 0) goto out_ctx; } /* do the open */ req = prepare_open_request(dir->i_sb, flags, mode); if (IS_ERR(req)) { err = PTR_ERR(req); goto out_ctx; } req->r_dentry = dget(dentry); req->r_num_caps = 2; if (flags & O_CREAT) { req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; req->r_dentry_unless = CEPH_CAP_FILE_EXCL; if (as_ctx.pagelist) { req->r_pagelist = as_ctx.pagelist; as_ctx.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), &as_ctx); file->f_mode |= FMODE_CREATED; } err = finish_open(file, dentry, ceph_open); } 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_ctx: ceph_release_acl_sec_ctx(&as_ctx); 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); if (S_ISDIR(inode->i_mode)) { struct ceph_dir_file_info *dfi = file->private_data; dout("release inode %p dir file %p\n", inode, file); WARN_ON(!list_empty(&dfi->file_info.rw_contexts)); ceph_put_fmode(ci, dfi->file_info.fmode); if (dfi->last_readdir) ceph_mdsc_put_request(dfi->last_readdir); kfree(dfi->last_name); kfree(dfi->dir_info); kmem_cache_free(ceph_dir_file_cachep, dfi); } else { struct ceph_file_info *fi = file->private_data; dout("release inode %p regular file %p\n", inode, file); WARN_ON(!list_empty(&fi->rw_contexts)); ceph_put_fmode(ci, fi->fmode); kmem_cache_free(ceph_file_cachep, fi); } /* 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, }; /* * 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. (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 ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to, int *retry_op) { 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_osd_client *osdc = &fsc->client->osdc; ssize_t ret; u64 off = iocb->ki_pos; u64 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 - 1); if (ret < 0) return ret; ret = 0; while ((len = iov_iter_count(to)) > 0) { struct ceph_osd_request *req; struct page **pages; int num_pages; size_t page_off; u64 i_size; bool more; req = ceph_osdc_new_request(osdc, &ci->i_layout, ci->i_vino, off, &len, 0, 1, CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, NULL, ci->i_truncate_seq, ci->i_truncate_size, false); if (IS_ERR(req)) { ret = PTR_ERR(req); break; } more = len < iov_iter_count(to); if (unlikely(iov_iter_is_pipe(to))) { ret = iov_iter_get_pages_alloc(to, &pages, len, &page_off); if (ret <= 0) { ceph_osdc_put_request(req); ret = -ENOMEM; break; } num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE); if (ret < len) { len = ret; osd_req_op_extent_update(req, 0, len); more = false; } } else { num_pages = calc_pages_for(off, len); page_off = off & ~PAGE_MASK; pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); if (IS_ERR(pages)) { ceph_osdc_put_request(req); ret = PTR_ERR(pages); break; } } osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off, false, false); ret = ceph_osdc_start_request(osdc, req, false); if (!ret) ret = ceph_osdc_wait_request(osdc, req); ceph_osdc_put_request(req); i_size = i_size_read(inode); dout("sync_read %llu~%llu got %zd i_size %llu%s\n", off, len, ret, i_size, (more ? " MORE" : "")); if (ret == -ENOENT) ret = 0; if (ret >= 0 && ret < len && (off + ret < i_size)) { int zlen = min(len - ret, i_size - off - ret); int zoff = page_off + ret; dout("sync_read zero gap %llu~%llu\n", off + ret, off + ret + zlen); ceph_zero_page_vector_range(zoff, zlen, pages); ret += zlen; } if (unlikely(iov_iter_is_pipe(to))) { 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 { int idx = 0; size_t left = ret > 0 ? ret : 0; while (left > 0) { size_t len, copied; page_off = off & ~PAGE_MASK; len = min_t(size_t, left, PAGE_SIZE - page_off); copied = copy_page_to_iter(pages[idx++], page_off, len, to); off += copied; left -= copied; if (copied < len) { ret = -EFAULT; break; } } ceph_release_page_vector(pages, num_pages); } if (ret <= 0 || off >= i_size || !more) break; } if (off > iocb->ki_pos) { if (ret >= 0 && iov_iter_count(to) > 0 && off >= i_size_read(inode)) *retry_op = CHECK_EOF; ret = off - iocb->ki_pos; iocb->ki_pos = off; } dout("sync_read result %zd retry_op %d\n", ret, *retry_op); return ret; } struct ceph_aio_request { struct kiocb *iocb; size_t total_len; bool write; bool should_dirty; int error; struct list_head osd_reqs; unsigned num_reqs; atomic_t pending_reqs; struct timespec64 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); BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS); BUG_ON(!osd_data->num_bvecs); dout("ceph_aio_complete_req %p rc %d bytes %u\n", inode, rc, osd_data->bvec_pos.iter.bi_size); 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)->inode_wq, &aio_work->work); return; } rc = -ENOMEM; } else if (!aio_req->write) { if (rc == -ENOENT) rc = 0; if (rc >= 0 && osd_data->bvec_pos.iter.bi_size > rc) { struct iov_iter i; int zlen = osd_data->bvec_pos.iter.bi_size - 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; } iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs, osd_data->num_bvecs, osd_data->bvec_pos.iter.bi_size); iov_iter_advance(&i, rc); iov_iter_zero(zlen, &i); } } put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs, aio_req->should_dirty); 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, 1, 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); req->r_ops[0] = orig_req->r_ops[0]; req->r_mtime = aio_req->mtime; req->r_data_offset = req->r_ops[0].extent.offset; ret = ceph_osdc_alloc_messages(req, GFP_NOFS); if (ret) { ceph_osdc_put_request(req); req = orig_req; goto out; } ceph_osdc_put_request(orig_req); req->r_callback = ceph_aio_complete_req; req->r_inode = inode; req->r_priv = aio_req; 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 bio_vec *bvecs; struct ceph_aio_request *aio_req = NULL; int num_pages = 0; int flags; int ret; struct timespec64 mtime = current_time(inode); size_t count = iov_iter_count(iter); loff_t pos = iocb->ki_pos; bool write = iov_iter_rw(iter) == WRITE; bool should_dirty = !write && iter_is_iovec(iter); if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP) return -EROFS; dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n", (write ? "write" : "read"), file, pos, (unsigned)count, snapc, snapc ? snapc->seq : 0); ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count - 1); if (ret < 0) return ret; if (write) { int ret2 = invalidate_inode_pages2_range(inode->i_mapping, pos >> PAGE_SHIFT, (pos + count - 1) >> 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 = iov_iter_count(iter); ssize_t len; if (write) size = min_t(u64, size, fsc->mount_options->wsize); else size = min_t(u64, size, fsc->mount_options->rsize); vino = ceph_vino(inode); req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, pos, &size, 0, 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 = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages); if (len < 0) { ceph_osdc_put_request(req); ret = len; break; } if (len != size) osd_req_op_extent_update(req, 0, len); /* * 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; aio_req->should_dirty = should_dirty; 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, PAGE_ALIGN(pos + len) - 1); req->r_mtime = mtime; } osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len); 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_private_item, &aio_req->osd_reqs); pos += 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) { struct iov_iter i; int zlen = min_t(size_t, len - ret, size - pos - ret); iov_iter_bvec(&i, READ, bvecs, num_pages, len); iov_iter_advance(&i, ret); iov_iter_zero(zlen, &i); ret += zlen; } if (ret >= 0) len = ret; } put_bvecs(bvecs, num_pages, should_dirty); ceph_osdc_put_request(req); if (ret < 0) break; pos += 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_private_item); list_del_init(&req->r_private_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 ret; bool check_caps = false; struct timespec64 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 snapc %p seq %lld\n", file, pos, (unsigned)count, snapc, snapc->seq); ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count - 1); if (ret < 0) return ret; ret = invalidate_inode_pages2_range(inode->i_mapping, pos >> PAGE_SHIFT, (pos + count - 1) >> 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 { CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 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)); ceph_add_rw_context(fi, &rw_ctx); ret = generic_file_read_iter(iocb, to); ceph_del_rw_context(fi, &rw_ctx); } 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_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_cap_flush *prealloc_cf; ssize_t count, written = 0; int err, want, got; loff_t pos; loff_t limit = max(i_size_read(inode), fsc->max_file_size); if (ceph_snap(inode) != CEPH_NOSNAP) return -EROFS; prealloc_cf = ceph_alloc_cap_flush(); if (!prealloc_cf) return -ENOMEM; retry_snap: 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; if (unlikely(pos >= limit)) { err = -EFBIG; goto out; } else { iov_iter_truncate(from, limit - pos); } count = iov_iter_count(from); if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) { err = -EDQUOT; goto out; } err = file_remove_privs(file); if (err) goto out; err = file_update_time(file); if (err) goto out; inode_inc_iversion_raw(inode); if (ci->i_inline_version != CEPH_INLINE_NONE) { err = ceph_uninline_data(file, NULL); if (err < 0) goto out; } /* FIXME: not complete since it doesn't account for being at quota */ if (ceph_osdmap_flag(&fsc->client->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 > 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); if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos)) ceph_check_caps(ci, CHECK_CAPS_NODELAY, NULL); } 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 == -EOLDSNAPC) { dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n", inode, ceph_vinop(inode), pos, (unsigned)count); goto retry_snap; } if (written >= 0) { if (ceph_osdmap_flag(&fsc->client->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; struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 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 < 0 || offset >= i_size) { ret = -ENXIO; goto out; } break; case SEEK_HOLE: if (offset < 0 || offset >= i_size) { ret = -ENXIO; goto out; } offset = i_size; break; } ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size)); 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_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 (ci->i_inline_version != CEPH_INLINE_NONE) { ret = ceph_uninline_data(file, NULL); if (ret < 0) goto unlock; } size = i_size_read(inode); /* Are we punching a hole beyond EOF? */ if (offset >= size) goto unlock; if ((offset + length) > size) length = size - offset; 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; ceph_zero_pagecache_range(inode, offset, length); ret = ceph_zero_objects(inode, offset, length); 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; } /* * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for * src_ci. Two attempts are made to obtain both caps, and an error is return if * this fails; zero is returned on success. */ static int get_rd_wr_caps(struct ceph_inode_info *src_ci, loff_t src_endoff, int *src_got, struct ceph_inode_info *dst_ci, loff_t dst_endoff, int *dst_got) { int ret = 0; bool retrying = false; retry_caps: ret = ceph_get_caps(dst_ci, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER, dst_endoff, dst_got, NULL); if (ret < 0) return ret; /* * Since we're already holding the FILE_WR capability for the dst file, * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some * retry dance instead to try to get both capabilities. */ ret = ceph_try_get_caps(src_ci, CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED, false, src_got); if (ret <= 0) { /* Start by dropping dst_ci caps and getting src_ci caps */ ceph_put_cap_refs(dst_ci, *dst_got); if (retrying) { if (!ret) /* ceph_try_get_caps masks EAGAIN */ ret = -EAGAIN; return ret; } ret = ceph_get_caps(src_ci, CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED, src_endoff, src_got, NULL); if (ret < 0) return ret; /*... drop src_ci caps too, and retry */ ceph_put_cap_refs(src_ci, *src_got); retrying = true; goto retry_caps; } return ret; } static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got, struct ceph_inode_info *dst_ci, int dst_got) { ceph_put_cap_refs(src_ci, src_got); ceph_put_cap_refs(dst_ci, dst_got); } /* * This function does several size-related checks, returning an error if: * - source file is smaller than off+len * - destination file size is not OK (inode_newsize_ok()) * - max bytes quotas is exceeded */ static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode, loff_t src_off, loff_t dst_off, size_t len) { loff_t size, endoff; size = i_size_read(src_inode); /* * Don't copy beyond source file EOF. Instead of simply setting length * to (size - src_off), just drop to VFS default implementation, as the * local i_size may be stale due to other clients writing to the source * inode. */ if (src_off + len > size) { dout("Copy beyond EOF (%llu + %zu > %llu)\n", src_off, len, size); return -EOPNOTSUPP; } size = i_size_read(dst_inode); endoff = dst_off + len; if (inode_newsize_ok(dst_inode, endoff)) return -EOPNOTSUPP; if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff)) return -EDQUOT; return 0; } static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off, struct file *dst_file, loff_t dst_off, size_t len, unsigned int flags) { struct inode *src_inode = file_inode(src_file); struct inode *dst_inode = file_inode(dst_file); struct ceph_inode_info *src_ci = ceph_inode(src_inode); struct ceph_inode_info *dst_ci = ceph_inode(dst_inode); struct ceph_cap_flush *prealloc_cf; struct ceph_object_locator src_oloc, dst_oloc; struct ceph_object_id src_oid, dst_oid; loff_t endoff = 0, size; ssize_t ret = -EIO; u64 src_objnum, dst_objnum, src_objoff, dst_objoff; u32 src_objlen, dst_objlen, object_size; int src_got = 0, dst_got = 0, err, dirty; bool do_final_copy = false; if (src_inode == dst_inode) return -EINVAL; if (src_inode->i_sb != dst_inode->i_sb) return -EXDEV; if (ceph_snap(dst_inode) != CEPH_NOSNAP) return -EROFS; /* * Some of the checks below will return -EOPNOTSUPP, which will force a * fallback to the default VFS copy_file_range implementation. This is * desirable in several cases (for ex, the 'len' is smaller than the * size of the objects, or in cases where that would be more * efficient). */ if (ceph_test_mount_opt(ceph_inode_to_client(src_inode), NOCOPYFROM)) return -EOPNOTSUPP; if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) || (src_ci->i_layout.stripe_count != dst_ci->i_layout.stripe_count) || (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) return -EOPNOTSUPP; if (len < src_ci->i_layout.object_size) return -EOPNOTSUPP; /* no remote copy will be done */ prealloc_cf = ceph_alloc_cap_flush(); if (!prealloc_cf) return -ENOMEM; /* Start by sync'ing the source and destination files */ ret = file_write_and_wait_range(src_file, src_off, (src_off + len)); if (ret < 0) { dout("failed to write src file (%zd)\n", ret); goto out; } ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len)); if (ret < 0) { dout("failed to write dst file (%zd)\n", ret); goto out; } /* * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other * clients may have dirty data in their caches. And OSDs know nothing * about caps, so they can't safely do the remote object copies. */ err = get_rd_wr_caps(src_ci, (src_off + len), &src_got, dst_ci, (dst_off + len), &dst_got); if (err < 0) { dout("get_rd_wr_caps returned %d\n", err); ret = -EOPNOTSUPP; goto out; } ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len); if (ret < 0) goto out_caps; size = i_size_read(dst_inode); endoff = dst_off + len; /* Drop dst file cached pages */ ret = invalidate_inode_pages2_range(dst_inode->i_mapping, dst_off >> PAGE_SHIFT, endoff >> PAGE_SHIFT); if (ret < 0) { dout("Failed to invalidate inode pages (%zd)\n", ret); ret = 0; /* XXX */ } src_oloc.pool = src_ci->i_layout.pool_id; src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns); dst_oloc.pool = dst_ci->i_layout.pool_id; dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns); ceph_calc_file_object_mapping(&src_ci->i_layout, src_off, src_ci->i_layout.object_size, &src_objnum, &src_objoff, &src_objlen); ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off, dst_ci->i_layout.object_size, &dst_objnum, &dst_objoff, &dst_objlen); /* object-level offsets need to the same */ if (src_objoff != dst_objoff) { ret = -EOPNOTSUPP; goto out_caps; } /* * Do a manual copy if the object offset isn't object aligned. * 'src_objlen' contains the bytes left until the end of the object, * starting at the src_off */ if (src_objoff) { /* * we need to temporarily drop all caps as we'll be calling * {read,write}_iter, which will get caps again. */ put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got); ret = do_splice_direct(src_file, &src_off, dst_file, &dst_off, src_objlen, flags); if (ret < 0) { dout("do_splice_direct returned %d\n", err); goto out; } len -= ret; err = get_rd_wr_caps(src_ci, (src_off + len), &src_got, dst_ci, (dst_off + len), &dst_got); if (err < 0) goto out; err = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len); if (err < 0) goto out_caps; } object_size = src_ci->i_layout.object_size; while (len >= object_size) { ceph_calc_file_object_mapping(&src_ci->i_layout, src_off, object_size, &src_objnum, &src_objoff, &src_objlen); ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off, object_size, &dst_objnum, &dst_objoff, &dst_objlen); ceph_oid_init(&src_oid); ceph_oid_printf(&src_oid, "%llx.%08llx", src_ci->i_vino.ino, src_objnum); ceph_oid_init(&dst_oid); ceph_oid_printf(&dst_oid, "%llx.%08llx", dst_ci->i_vino.ino, dst_objnum); /* Do an object remote copy */ err = ceph_osdc_copy_from( &ceph_inode_to_client(src_inode)->client->osdc, src_ci->i_vino.snap, 0, &src_oid, &src_oloc, CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL | CEPH_OSD_OP_FLAG_FADVISE_NOCACHE, &dst_oid, &dst_oloc, CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL | CEPH_OSD_OP_FLAG_FADVISE_DONTNEED, 0); if (err) { dout("ceph_osdc_copy_from returned %d\n", err); if (!ret) ret = err; goto out_caps; } len -= object_size; src_off += object_size; dst_off += object_size; ret += object_size; } if (len) /* We still need one final local copy */ do_final_copy = true; file_update_time(dst_file); inode_inc_iversion_raw(dst_inode); if (endoff > size) { int caps_flags = 0; /* Let the MDS know about dst file size change */ if (ceph_quota_is_max_bytes_approaching(dst_inode, endoff)) caps_flags |= CHECK_CAPS_NODELAY; if (ceph_inode_set_size(dst_inode, endoff)) caps_flags |= CHECK_CAPS_AUTHONLY; if (caps_flags) ceph_check_caps(dst_ci, caps_flags, NULL); } /* Mark Fw dirty */ spin_lock(&dst_ci->i_ceph_lock); dst_ci->i_inline_version = CEPH_INLINE_NONE; dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf); spin_unlock(&dst_ci->i_ceph_lock); if (dirty) __mark_inode_dirty(dst_inode, dirty); out_caps: put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got); if (do_final_copy) { err = do_splice_direct(src_file, &src_off, dst_file, &dst_off, len, flags); if (err < 0) { dout("do_splice_direct returned %d\n", err); goto out; } len -= err; ret += err; } out: ceph_free_cap_flush(prealloc_cf); return ret; } static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off, struct file *dst_file, loff_t dst_off, size_t len, unsigned int flags) { ssize_t ret; ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off, len, flags); if (ret == -EOPNOTSUPP || ret == -EXDEV) ret = generic_copy_file_range(src_file, src_off, dst_file, dst_off, len, flags); 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, .copy_file_range = ceph_copy_file_range, };