| #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 "super.h" |
| #include "mds_client.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; |
| |
| switch (inode->i_mode & S_IFMT) { |
| case S_IFREG: |
| 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|O_TRUNC)) |
| 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) { |
| *opened |= FILE_CREATED; |
| } |
| err = finish_open(file, dentry, ceph_open, opened); |
| } |
| |
| out_err: |
| 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; |
| int io_align, page_align; |
| int left, 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~%u (read %u) got %d%s%s\n", pos, left, read, |
| ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); |
| |
| if (ret > 0) { |
| int didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; |
| |
| if (read < pos - off) { |
| dout(" zero gap %llu to %llu\n", off + read, pos); |
| ceph_zero_page_vector_range(page_align + read, |
| pos - off - read, pages); |
| } |
| pos += ret; |
| read = pos - off; |
| left -= ret; |
| page_pos += didpages; |
| pages_left -= didpages; |
| |
| /* hit stripe? */ |
| if (left && hit_stripe) |
| goto more; |
| } |
| |
| if (was_short) { |
| /* did we bounce off eof? */ |
| if (pos + left > inode->i_size) |
| *checkeof = 1; |
| |
| /* zero trailing bytes (inside i_size) */ |
| if (left > 0 && pos < inode->i_size) { |
| if (pos + left > inode->i_size) |
| left = inode->i_size - pos; |
| |
| dout("zero tail %d\n", left); |
| ceph_zero_page_vector_range(page_align + read, left, |
| pages); |
| read += left; |
| } |
| } |
| |
| if (ret >= 0) |
| ret = read; |
| 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 file *file, char __user *data, |
| unsigned len, loff_t *poff, int *checkeof) |
| { |
| struct inode *inode = file_inode(file); |
| struct page **pages; |
| u64 off = *poff; |
| int num_pages, ret; |
| |
| dout("sync_read on file %p %llu~%u %s\n", file, off, len, |
| (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); |
| |
| if (file->f_flags & O_DIRECT) { |
| num_pages = calc_pages_for((unsigned long)data, len); |
| pages = ceph_get_direct_page_vector(data, num_pages, true); |
| } 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); |
| |
| /* |
| * 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(inode->i_mapping); |
| if (ret < 0) |
| goto done; |
| |
| ret = striped_read(inode, off, len, pages, num_pages, checkeof, |
| file->f_flags & O_DIRECT, |
| (unsigned long)data & ~PAGE_MASK); |
| |
| if (ret >= 0 && (file->f_flags & O_DIRECT) == 0) |
| ret = ceph_copy_page_vector_to_user(pages, data, off, ret); |
| if (ret >= 0) |
| *poff = off + ret; |
| |
| done: |
| if (file->f_flags & O_DIRECT) |
| ceph_put_page_vector(pages, num_pages, true); |
| else |
| ceph_release_page_vector(pages, num_pages); |
| 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 |
| * O_DIRECT). |
| * |
| * 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 file *file, const char __user *data, |
| size_t left, loff_t pos, loff_t *ppos) |
| { |
| 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; |
| int num_ops = 1; |
| struct page **pages; |
| int num_pages; |
| u64 len; |
| int written = 0; |
| int flags; |
| int check_caps = 0; |
| int page_align, io_align; |
| unsigned long buf_align; |
| int ret; |
| struct timespec mtime = CURRENT_TIME; |
| bool own_pages = false; |
| |
| if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) |
| return -EROFS; |
| |
| dout("sync_write on file %p %lld~%u %s\n", file, pos, |
| (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); |
| |
| ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left); |
| if (ret < 0) |
| return ret; |
| |
| ret = invalidate_inode_pages2_range(inode->i_mapping, |
| pos >> PAGE_CACHE_SHIFT, |
| (pos + left) >> 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; |
| if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0) |
| flags |= CEPH_OSD_FLAG_ACK; |
| else |
| num_ops++; /* Also include a 'startsync' command. */ |
| |
| /* |
| * we may need to do multiple writes here if we span an object |
| * boundary. this isn't atomic, unfortunately. :( |
| */ |
| more: |
| io_align = pos & ~PAGE_MASK; |
| buf_align = (unsigned long)data & ~PAGE_MASK; |
| len = left; |
| |
| 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, num_ops, |
| CEPH_OSD_OP_WRITE, flags, snapc, |
| ci->i_truncate_seq, ci->i_truncate_size, |
| false); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| /* write from beginning of first page, regardless of io alignment */ |
| page_align = file->f_flags & O_DIRECT ? buf_align : io_align; |
| num_pages = calc_pages_for(page_align, len); |
| if (file->f_flags & O_DIRECT) { |
| pages = ceph_get_direct_page_vector(data, num_pages, false); |
| if (IS_ERR(pages)) { |
| ret = PTR_ERR(pages); |
| goto out; |
| } |
| |
| /* |
| * throw out any page cache pages in this range. this |
| * may block. |
| */ |
| truncate_inode_pages_range(inode->i_mapping, pos, |
| (pos+len) | (PAGE_CACHE_SIZE-1)); |
| } else { |
| pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
| if (IS_ERR(pages)) { |
| ret = PTR_ERR(pages); |
| goto out; |
| } |
| ret = ceph_copy_user_to_page_vector(pages, data, pos, len); |
| if (ret < 0) { |
| ceph_release_page_vector(pages, num_pages); |
| goto out; |
| } |
| |
| if ((file->f_flags & O_SYNC) == 0) { |
| /* get a second commit callback */ |
| req->r_unsafe_callback = ceph_sync_write_unsafe; |
| req->r_inode = inode; |
| own_pages = true; |
| } |
| } |
| osd_req_op_extent_osd_data_pages(req, 0, true, pages, len, |
| page_align, false, own_pages); |
| |
| /* 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); |
| |
| if (file->f_flags & O_DIRECT) |
| ceph_put_page_vector(pages, num_pages, false); |
| else if (file->f_flags & O_SYNC) |
| ceph_release_page_vector(pages, num_pages); |
| |
| out: |
| ceph_osdc_put_request(req); |
| if (ret == 0) { |
| pos += len; |
| written += len; |
| left -= len; |
| data += len; |
| if (left) |
| goto more; |
| |
| ret = written; |
| *ppos = pos; |
| 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); |
| } |
| 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_aio_read(struct kiocb *iocb, const struct iovec *iov, |
| unsigned long nr_segs, loff_t pos) |
| { |
| struct file *filp = iocb->ki_filp; |
| struct ceph_file_info *fi = filp->private_data; |
| loff_t *ppos = &iocb->ki_pos; |
| size_t len = iov->iov_len; |
| struct inode *inode = file_inode(filp); |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| void __user *base = iov->iov_base; |
| ssize_t ret; |
| int want, got = 0; |
| int checkeof = 0, read = 0; |
| |
| dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", |
| inode, ceph_vinop(inode), pos, (unsigned)len, inode); |
| again: |
| 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) |
| goto out; |
| dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", |
| inode, ceph_vinop(inode), pos, (unsigned)len, |
| ceph_cap_string(got)); |
| |
| if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || |
| (iocb->ki_filp->f_flags & O_DIRECT) || |
| (inode->i_sb->s_flags & MS_SYNCHRONOUS) || |
| (fi->flags & CEPH_F_SYNC)) |
| /* hmm, this isn't really async... */ |
| ret = ceph_sync_read(filp, base, len, ppos, &checkeof); |
| else |
| ret = generic_file_aio_read(iocb, iov, nr_segs, pos); |
| |
| out: |
| 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 && *ppos < inode->i_size) { |
| dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size); |
| read += ret; |
| base += 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_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| unsigned long nr_segs, loff_t pos) |
| { |
| 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, written = 0; |
| int err, want, got; |
| bool hold_mutex; |
| |
| if (ceph_snap(inode) != CEPH_NOSNAP) |
| return -EROFS; |
| |
| sb_start_write(inode->i_sb); |
| mutex_lock(&inode->i_mutex); |
| hold_mutex = true; |
| |
| err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ); |
| if (err) |
| goto out; |
| |
| /* 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; |
| |
| 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 || |
| (iocb->ki_filp->f_flags & O_DIRECT) || |
| (inode->i_sb->s_flags & MS_SYNCHRONOUS) || |
| (fi->flags & CEPH_F_SYNC)) { |
| mutex_unlock(&inode->i_mutex); |
| written = ceph_sync_write(file, iov->iov_base, count, |
| pos, &iocb->ki_pos); |
| } else { |
| written = generic_file_buffered_write(iocb, iov, nr_segs, |
| pos, &iocb->ki_pos, |
| count, 0); |
| mutex_unlock(&inode->i_mutex); |
| } |
| hold_mutex = false; |
| |
| 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)iov->iov_len, |
| 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; |
| } |
| |
| if (written == -EOLDSNAPC) { |
| dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n", |
| inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len); |
| mutex_lock(&inode->i_mutex); |
| hold_mutex = true; |
| goto retry_snap; |
| } |
| out: |
| if (hold_mutex) |
| mutex_unlock(&inode->i_mutex); |
| sb_end_write(inode->i_sb); |
| 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); |
| __ceph_do_pending_vmtruncate(inode, false); |
| |
| 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; |
| } |
| |
| if (offset < 0 || offset > inode->i_sb->s_maxbytes) { |
| offset = -EINVAL; |
| goto out; |
| } |
| |
| /* Special lock needed here? */ |
| if (offset != file->f_pos) { |
| file->f_pos = offset; |
| file->f_version = 0; |
| } |
| |
| out: |
| mutex_unlock(&inode->i_mutex); |
| return offset; |
| } |
| |
| const struct file_operations ceph_file_fops = { |
| .open = ceph_open, |
| .release = ceph_release, |
| .llseek = ceph_llseek, |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .aio_read = ceph_aio_read, |
| .aio_write = ceph_aio_write, |
| .mmap = ceph_mmap, |
| .fsync = ceph_fsync, |
| .lock = ceph_lock, |
| .flock = ceph_flock, |
| .splice_read = generic_file_splice_read, |
| .splice_write = generic_file_splice_write, |
| .unlocked_ioctl = ceph_ioctl, |
| .compat_ioctl = ceph_ioctl, |
| }; |
| |