| // SPDX-License-Identifier: GPL-2.0 |
| #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) { |
| ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ |
| return -ENOMEM; |
| } |
| cf->fmode = fmode; |
| |
| spin_lock_init(&cf->rw_contexts_lock); |
| INIT_LIST_HEAD(&cf->rw_contexts); |
| |
| 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 | CEPH_CAP_AUTH_EXCL; |
| 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); |
| WARN_ON(!list_empty(&cf->rw_contexts)); |
| 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; |
| bool write; |
| bool should_dirty; |
| 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->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, 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]; |
| |
| 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; |
| 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->seq); |
| |
| 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, |
| 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; |
| } |
| |
| if (write) |
| size = min_t(u64, size, fsc->mount_options->wsize); |
| else |
| size = min_t(u64, size, fsc->mount_options->rsize); |
| |
| 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; |
| 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, |
| (pos+len) | (PAGE_SIZE - 1)); |
| |
| 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, should_dirty); |
| |
| 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 ret; |
| bool check_caps = false; |
| 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 snapc %p seq %lld\n", |
| file, pos, (unsigned)count, snapc, snapc->seq); |
| |
| 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 { |
| 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_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; |
| |
| 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; |
| 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; |
| } |
| |
| /* 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 > 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 == -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(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 < 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, 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, |
| }; |
| |