#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/aio.h> #include <linux/falloc.h> #include "super.h" #include "mds_client.h" #include "cache.h" /* * 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. */ /* * 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 = cpu_to_le32(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; 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; switch (inode->i_mode & S_IFMT) { case S_IFREG: /* First file open request creates the cookie, we want to keep * this cookie around for the filetime of the inode as not to * have to worry about fscache register / revoke / operation * races. * * Also, if we know the operation is going to invalidate data * (non readonly) just nuke the cache right away. */ ceph_fscache_register_inode_cookie(mdsc->fsc, ci); if ((fmode & CEPH_FILE_MODE_WR)) ceph_fscache_invalidate(inode); case S_IFDIR: dout("init_file %p %p 0%o (regular)\n", inode, file, inode->i_mode); cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO); if (cf == NULL) { ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ return -ENOMEM; } cf->fmode = fmode; cf->next_offset = 2; 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; } /* * 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; struct inode *parent_inode = NULL; 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); 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; if (flags & O_CREAT) parent_inode = ceph_get_dentry_parent_inode(file->f_dentry); err = ceph_mdsc_do_request(mdsc, parent_inode, req); iput(parent_inode); 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; int err; dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n", dir, dentry, dentry->d_name.len, dentry->d_name.name, d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); if (dentry->d_name.len > NAME_MAX) return -ENAMETOOLONG; err = ceph_init_dentry(dentry); if (err < 0) return err; /* do the open */ req = prepare_open_request(dir->i_sb, flags, mode); if (IS_ERR(req)) return PTR_ERR(req); 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; } req->r_locked_dir = dir; /* caller holds dir->i_mutex */ err = ceph_mdsc_do_request(mdsc, (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, req); if (err) goto out_err; err = ceph_handle_snapdir(req, dentry, err); if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry) err = ceph_handle_notrace_create(dir, dentry); if (d_unhashed(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_err; if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) { /* 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_acl(dentry, dentry->d_inode, dir); *opened |= FILE_CREATED; } err = finish_open(file, dentry, ceph_open, opened); } out_err: 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); 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); dput(cf->dentry); 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; } /* * 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 off, u64 len, struct page **pages, int num_pages, int *checkeof, bool o_direct, unsigned long buf_align) { struct ceph_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_inode_info *ci = ceph_inode(inode); u64 pos, this_len, left; int io_align, page_align; int pages_left; int read; struct page **page_pos; int ret; bool hit_stripe, was_short; /* * we may need to do multiple reads. not atomic, unfortunately. */ pos = off; left = len; page_pos = pages; pages_left = num_pages; read = 0; io_align = off & ~PAGE_MASK; more: if (o_direct) page_align = (pos - io_align + buf_align) & ~PAGE_MASK; else page_align = pos & ~PAGE_MASK; this_len = left; ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), &ci->i_layout, pos, &this_len, ci->i_truncate_seq, ci->i_truncate_size, page_pos, pages_left, page_align); if (ret == -ENOENT) ret = 0; hit_stripe = this_len < left; was_short = ret >= 0 && ret < this_len; dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read, ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); if (ret >= 0) { int didpages; if (was_short && (pos + ret < inode->i_size)) { u64 tmp = min(this_len - ret, inode->i_size - pos - ret); dout(" zero gap %llu to %llu\n", pos + ret, pos + ret + tmp); ceph_zero_page_vector_range(page_align + read + ret, tmp, pages); ret += tmp; } didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; pos += ret; read = pos - off; left -= ret; page_pos += didpages; pages_left -= didpages; /* hit stripe and need continue*/ if (left && hit_stripe && pos < inode->i_size) goto more; } if (read > 0) { ret = read; /* did we bounce off eof? */ if (pos + left > inode->i_size) *checkeof = 1; } 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 *i, 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, ret; size_t len = iov_iter_count(i); 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 (file->f_flags & O_DIRECT) { while (iov_iter_count(i)) { size_t start; ssize_t n; n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start); if (n < 0) return n; num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; ret = striped_read(inode, off, n, pages, num_pages, checkeof, 1, start); ceph_put_page_vector(pages, num_pages, true); if (ret <= 0) break; off += ret; iov_iter_advance(i, ret); if (ret < n) break; } } else { num_pages = calc_pages_for(off, len); pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); if (IS_ERR(pages)) return PTR_ERR(pages); ret = striped_read(inode, off, len, pages, num_pages, checkeof, 0, 0); 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, PAGE_SIZE - page_off, left); l = copy_page_to_iter(pages[k++], page_off, copy, i); 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 %d\n", ret); return ret; } /* * Write commit request unsafe callback, called to tell us when a * request is unsafe (that is, in flight--has been handed to the * messenger to send to its target osd). It is called again when * we've received a response message indicating the request is * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request * is completed early (and unsuccessfully) due to a timeout or * interrupt. * * This is used if we requested both an ACK and ONDISK commit reply * from the OSD. */ static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) { struct ceph_inode_info *ci = ceph_inode(req->r_inode); dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, unsafe ? "un" : ""); if (unsafe) { ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); spin_lock(&ci->i_unsafe_lock); list_add_tail(&req->r_unsafe_item, &ci->i_unsafe_writes); spin_unlock(&ci->i_unsafe_lock); } else { spin_lock(&ci->i_unsafe_lock); list_del_init(&req->r_unsafe_item); spin_unlock(&ci->i_unsafe_lock); ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); } } /* * 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_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos) { 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_snap_context *snapc; struct ceph_vino vino; struct ceph_osd_request *req; struct page **pages; int num_pages; int written = 0; int flags; int check_caps = 0; int ret; struct timespec mtime = CURRENT_TIME; size_t count = iov_iter_count(from); if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) return -EROFS; dout("sync_direct_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_CACHE_SHIFT, (pos + count) >> PAGE_CACHE_SHIFT); if (ret < 0) dout("invalidate_inode_pages2_range returned %d\n", ret); flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE; while (iov_iter_count(from) > 0) { u64 len = iov_iter_single_seg_count(from); size_t start; ssize_t n; snapc = ci->i_snap_realm->cached_context; vino = ceph_vino(inode); req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, pos, &len, 2,/*include a 'startsync' command*/ CEPH_OSD_OP_WRITE, flags, snapc, ci->i_truncate_seq, ci->i_truncate_size, false); if (IS_ERR(req)) { ret = PTR_ERR(req); break; } n = iov_iter_get_pages_alloc(from, &pages, len, &start); if (unlikely(n < 0)) { ret = n; ceph_osdc_put_request(req); break; } num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; /* * throw out any page cache pages in this range. this * may block. */ truncate_inode_pages_range(inode->i_mapping, pos, (pos+n) | (PAGE_CACHE_SIZE-1)); osd_req_op_extent_osd_data_pages(req, 0, pages, n, start, false, false); /* BUG_ON(vino.snap != CEPH_NOSNAP); */ ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); if (!ret) ret = ceph_osdc_wait_request(&fsc->client->osdc, req); ceph_put_page_vector(pages, num_pages, false); ceph_osdc_put_request(req); if (ret) break; pos += n; written += n; iov_iter_advance(from, n); 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) { iocb->ki_pos = pos; ret = written; } 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 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_snap_context *snapc; 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; 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_CACHE_SHIFT, (pos + count) >> PAGE_CACHE_SHIFT); if (ret < 0) dout("invalidate_inode_pages2_range returned %d\n", ret); flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ACK; while ((len = iov_iter_count(from)) > 0) { size_t left; int n; snapc = ci->i_snap_realm->cached_context; vino = ceph_vino(inode); req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, pos, &len, 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_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); 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; } /* get a second commit callback */ req->r_unsafe_callback = ceph_sync_write_unsafe; req->r_inode = inode; osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, true); /* BUG_ON(vino.snap != CEPH_NOSNAP); */ ceph_osdc_build_request(req, pos, snapc, vino.snap, &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) { 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); } } else break; } 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 = iocb->ki_nbytes; struct inode *inode = file_inode(filp); struct ceph_inode_info *ci = ceph_inode(inode); ssize_t ret; int want, got = 0; int checkeof = 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, &got, -1); if (ret < 0) return ret; if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || (iocb->ki_filp->f_flags & O_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)); /* hmm, this isn't really async... */ ret = ceph_sync_read(iocb, to, &checkeof); } 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)); ret = generic_file_read_iter(iocb, to); } dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); ceph_put_cap_refs(ci, got); if (checkeof && ret >= 0) { int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); /* hit EOF or hole? */ if (statret == 0 && iocb->ki_pos < inode->i_size && ret < len) { dout("sync_read hit hole, ppos %lld < size %lld" ", reading more\n", iocb->ki_pos, inode->i_size); iov_iter_advance(to, ret); read += ret; len -= ret; checkeof = 0; 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; ssize_t count = iov_iter_count(from), written = 0; int err, want, got; loff_t pos = iocb->ki_pos; if (ceph_snap(inode) != CEPH_NOSNAP) return -EROFS; mutex_lock(&inode->i_mutex); /* We can write back this queue in page reclaim */ current->backing_dev_info = file->f_mapping->backing_dev_info; err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); if (err) goto out; if (count == 0) goto out; iov_iter_truncate(from, count); err = file_remove_suid(file); if (err) goto out; err = file_update_time(file); if (err) goto out; retry_snap: if (ceph_osdmap_flag(osdc->osdmap, 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, inode->i_size); 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, &got, pos + count); 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 || (file->f_flags & O_DIRECT) || (fi->flags & CEPH_F_SYNC)) { struct iov_iter data; mutex_unlock(&inode->i_mutex); /* we might need to revert back to that point */ data = *from; if (file->f_flags & O_DIRECT) written = ceph_sync_direct_write(iocb, &data, pos); else written = ceph_sync_write(iocb, &data, pos); if (written == -EOLDSNAPC) { dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n", inode, ceph_vinop(inode), pos, (unsigned)count); mutex_lock(&inode->i_mutex); goto retry_snap; } if (written > 0) iov_iter_advance(from, written); } else { loff_t old_size = inode->i_size; /* * 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; if (inode->i_size > old_size) ceph_fscache_update_objectsize(inode); mutex_unlock(&inode->i_mutex); } if (written >= 0) { int dirty; spin_lock(&ci->i_ceph_lock); dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); 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 && ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) || ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { err = vfs_fsync_range(file, pos, pos + written - 1, 1); if (err < 0) written = err; } goto out_unlocked; out: mutex_unlock(&inode->i_mutex); out_unlocked: 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; int ret; mutex_lock(&inode->i_mutex); if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); if (ret < 0) { offset = ret; goto out; } } switch (whence) { case SEEK_END: offset += inode->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) { offset = file->f_pos; goto out; } offset += file->f_pos; break; case SEEK_DATA: if (offset >= inode->i_size) { ret = -ENXIO; goto out; } break; case SEEK_HOLE: if (offset >= inode->i_size) { ret = -ENXIO; goto out; } offset = inode->i_size; break; } offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); out: mutex_unlock(&inode->i_mutex); return offset; } static inline void ceph_zero_partial_page( struct inode *inode, loff_t offset, unsigned size) { struct page *page; pgoff_t index = offset >> PAGE_CACHE_SHIFT; page = find_lock_page(inode->i_mapping, index); if (page) { wait_on_page_writeback(page); zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size); unlock_page(page); page_cache_release(page); } } static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, loff_t length) { loff_t nearly = round_up(offset, PAGE_CACHE_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_CACHE_SIZE) { loff_t size = round_down(length, PAGE_CACHE_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, 1, op, CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, NULL, 0, 0, false); if (IS_ERR(req)) { ret = PTR_ERR(req); goto out; } ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap, &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 = ceph_file_layout_su(ci->i_layout); s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout); s32 object_size = ceph_file_layout_object_size(ci->i_layout); 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; 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; mutex_lock(&inode->i_mutex); if (ceph_snap(inode) != CEPH_NOSNAP) { ret = -EROFS; goto unlock; } if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) && !(mode & FALLOC_FL_PUNCH_HOLE)) { ret = -ENOSPC; goto unlock; } size = i_size_read(inode); if (!(mode & FALLOC_FL_KEEP_SIZE)) endoff = offset + length; 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, &got, endoff); 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); dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); spin_unlock(&ci->i_ceph_lock); if (dirty) __mark_inode_dirty(inode, dirty); } ceph_put_cap_refs(ci, got); unlock: mutex_unlock(&inode->i_mutex); return ret; } const struct file_operations ceph_file_fops = { .open = ceph_open, .release = ceph_release, .llseek = ceph_llseek, .read = new_sync_read, .write = new_sync_write, .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, };