| /* |
| * (C) 2001 Clemson University and The University of Chicago |
| * |
| * See COPYING in top-level directory. |
| */ |
| |
| /* |
| * Linux VFS inode operations. |
| */ |
| |
| #include "protocol.h" |
| #include "orangefs-kernel.h" |
| #include "orangefs-bufmap.h" |
| |
| static int read_one_page(struct page *page) |
| { |
| int ret; |
| int max_block; |
| ssize_t bytes_read = 0; |
| struct inode *inode = page->mapping->host; |
| const __u32 blocksize = PAGE_SIZE; /* inode->i_blksize */ |
| const __u32 blockbits = PAGE_SHIFT; /* inode->i_blkbits */ |
| struct iov_iter to; |
| struct bio_vec bv = {.bv_page = page, .bv_len = PAGE_SIZE}; |
| |
| iov_iter_bvec(&to, ITER_BVEC | READ, &bv, 1, PAGE_SIZE); |
| |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "orangefs_readpage called with page %p\n", |
| page); |
| |
| max_block = ((inode->i_size / blocksize) + 1); |
| |
| if (page->index < max_block) { |
| loff_t blockptr_offset = (((loff_t) page->index) << blockbits); |
| |
| bytes_read = orangefs_inode_read(inode, |
| &to, |
| &blockptr_offset, |
| inode->i_size); |
| } |
| /* this will only zero remaining unread portions of the page data */ |
| iov_iter_zero(~0U, &to); |
| /* takes care of potential aliasing */ |
| flush_dcache_page(page); |
| if (bytes_read < 0) { |
| ret = bytes_read; |
| SetPageError(page); |
| } else { |
| SetPageUptodate(page); |
| if (PageError(page)) |
| ClearPageError(page); |
| ret = 0; |
| } |
| /* unlock the page after the ->readpage() routine completes */ |
| unlock_page(page); |
| return ret; |
| } |
| |
| static int orangefs_readpage(struct file *file, struct page *page) |
| { |
| return read_one_page(page); |
| } |
| |
| static int orangefs_readpages(struct file *file, |
| struct address_space *mapping, |
| struct list_head *pages, |
| unsigned nr_pages) |
| { |
| int page_idx; |
| int ret; |
| |
| gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_readpages called\n"); |
| |
| for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
| struct page *page; |
| |
| page = list_entry(pages->prev, struct page, lru); |
| list_del(&page->lru); |
| if (!add_to_page_cache(page, |
| mapping, |
| page->index, |
| GFP_KERNEL)) { |
| ret = read_one_page(page); |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "failure adding page to cache, read_one_page returned: %d\n", |
| ret); |
| } else { |
| put_page(page); |
| } |
| } |
| BUG_ON(!list_empty(pages)); |
| return 0; |
| } |
| |
| static void orangefs_invalidatepage(struct page *page, |
| unsigned int offset, |
| unsigned int length) |
| { |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "orangefs_invalidatepage called on page %p " |
| "(offset is %u)\n", |
| page, |
| offset); |
| |
| ClearPageUptodate(page); |
| ClearPageMappedToDisk(page); |
| return; |
| |
| } |
| |
| static int orangefs_releasepage(struct page *page, gfp_t foo) |
| { |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "orangefs_releasepage called on page %p\n", |
| page); |
| return 0; |
| } |
| |
| /* |
| * Having a direct_IO entry point in the address_space_operations |
| * struct causes the kernel to allows us to use O_DIRECT on |
| * open. Nothing will ever call this thing, but in the future we |
| * will need to be able to use O_DIRECT on open in order to support |
| * AIO. Modeled after NFS, they do this too. |
| */ |
| /* |
| * static ssize_t orangefs_direct_IO(int rw, |
| * struct kiocb *iocb, |
| * struct iov_iter *iter, |
| * loff_t offset) |
| *{ |
| * gossip_debug(GOSSIP_INODE_DEBUG, |
| * "orangefs_direct_IO: %s\n", |
| * iocb->ki_filp->f_path.dentry->d_name.name); |
| * |
| * return -EINVAL; |
| *} |
| */ |
| |
| struct backing_dev_info orangefs_backing_dev_info = { |
| .name = "orangefs", |
| .ra_pages = 0, |
| .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, |
| }; |
| |
| /** ORANGEFS2 implementation of address space operations */ |
| const struct address_space_operations orangefs_address_operations = { |
| .readpage = orangefs_readpage, |
| .readpages = orangefs_readpages, |
| .invalidatepage = orangefs_invalidatepage, |
| .releasepage = orangefs_releasepage, |
| /* .direct_IO = orangefs_direct_IO */ |
| }; |
| |
| static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr) |
| { |
| struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode); |
| struct orangefs_kernel_op_s *new_op; |
| loff_t orig_size; |
| int ret = -EINVAL; |
| |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n", |
| __func__, |
| get_khandle_from_ino(inode), |
| &orangefs_inode->refn.khandle, |
| orangefs_inode->refn.fs_id, |
| iattr->ia_size); |
| |
| /* Ensure that we have a up to date size, so we know if it changed. */ |
| ret = orangefs_inode_getattr(inode, 0, 1); |
| if (ret == -ESTALE) |
| ret = -EIO; |
| if (ret) { |
| gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n", |
| __func__, ret); |
| return ret; |
| } |
| orig_size = i_size_read(inode); |
| |
| truncate_setsize(inode, iattr->ia_size); |
| |
| new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE); |
| if (!new_op) |
| return -ENOMEM; |
| |
| new_op->upcall.req.truncate.refn = orangefs_inode->refn; |
| new_op->upcall.req.truncate.size = (__s64) iattr->ia_size; |
| |
| ret = service_operation(new_op, __func__, |
| get_interruptible_flag(inode)); |
| |
| /* |
| * the truncate has no downcall members to retrieve, but |
| * the status value tells us if it went through ok or not |
| */ |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "orangefs: orangefs_truncate got return value of %d\n", |
| ret); |
| |
| op_release(new_op); |
| |
| if (ret != 0) |
| return ret; |
| |
| /* |
| * Only change the c/mtime if we are changing the size or we are |
| * explicitly asked to change it. This handles the semantic difference |
| * between truncate() and ftruncate() as implemented in the VFS. |
| * |
| * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a |
| * special case where we need to update the times despite not having |
| * these flags set. For all other operations the VFS set these flags |
| * explicitly if it wants a timestamp update. |
| */ |
| if (orig_size != i_size_read(inode) && |
| !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) { |
| iattr->ia_ctime = iattr->ia_mtime = |
| current_fs_time(inode->i_sb); |
| iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Change attributes of an object referenced by dentry. |
| */ |
| int orangefs_setattr(struct dentry *dentry, struct iattr *iattr) |
| { |
| int ret = -EINVAL; |
| struct inode *inode = dentry->d_inode; |
| |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "orangefs_setattr: called on %s\n", |
| dentry->d_name.name); |
| |
| ret = inode_change_ok(inode, iattr); |
| if (ret) |
| goto out; |
| |
| if ((iattr->ia_valid & ATTR_SIZE) && |
| iattr->ia_size != i_size_read(inode)) { |
| ret = orangefs_setattr_size(inode, iattr); |
| if (ret) |
| goto out; |
| } |
| |
| setattr_copy(inode, iattr); |
| mark_inode_dirty(inode); |
| |
| ret = orangefs_inode_setattr(inode, iattr); |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "orangefs_setattr: inode_setattr returned %d\n", |
| ret); |
| |
| if (!ret && (iattr->ia_valid & ATTR_MODE)) |
| /* change mod on a file that has ACLs */ |
| ret = posix_acl_chmod(inode, inode->i_mode); |
| |
| out: |
| gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n", ret); |
| return ret; |
| } |
| |
| /* |
| * Obtain attributes of an object given a dentry |
| */ |
| int orangefs_getattr(struct vfsmount *mnt, |
| struct dentry *dentry, |
| struct kstat *kstat) |
| { |
| int ret = -ENOENT; |
| struct inode *inode = dentry->d_inode; |
| struct orangefs_inode_s *orangefs_inode = NULL; |
| |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "orangefs_getattr: called on %s\n", |
| dentry->d_name.name); |
| |
| ret = orangefs_inode_getattr(inode, 0, 1); |
| if (ret == 0) { |
| generic_fillattr(inode, kstat); |
| |
| /* override block size reported to stat */ |
| orangefs_inode = ORANGEFS_I(inode); |
| kstat->blksize = orangefs_inode->blksize; |
| } |
| return ret; |
| } |
| |
| int orangefs_permission(struct inode *inode, int mask) |
| { |
| int ret; |
| |
| if (mask & MAY_NOT_BLOCK) |
| return -ECHILD; |
| |
| gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__); |
| |
| /* Make sure the permission (and other common attrs) are up to date. */ |
| ret = orangefs_inode_getattr(inode, 0, 0); |
| if (ret < 0) |
| return ret; |
| |
| return generic_permission(inode, mask); |
| } |
| |
| /* ORANGEDS2 implementation of VFS inode operations for files */ |
| struct inode_operations orangefs_file_inode_operations = { |
| .get_acl = orangefs_get_acl, |
| .set_acl = orangefs_set_acl, |
| .setattr = orangefs_setattr, |
| .getattr = orangefs_getattr, |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .listxattr = orangefs_listxattr, |
| .removexattr = generic_removexattr, |
| .permission = orangefs_permission, |
| }; |
| |
| static int orangefs_init_iops(struct inode *inode) |
| { |
| inode->i_mapping->a_ops = &orangefs_address_operations; |
| |
| switch (inode->i_mode & S_IFMT) { |
| case S_IFREG: |
| inode->i_op = &orangefs_file_inode_operations; |
| inode->i_fop = &orangefs_file_operations; |
| inode->i_blkbits = PAGE_SHIFT; |
| break; |
| case S_IFLNK: |
| inode->i_op = &orangefs_symlink_inode_operations; |
| break; |
| case S_IFDIR: |
| inode->i_op = &orangefs_dir_inode_operations; |
| inode->i_fop = &orangefs_dir_operations; |
| break; |
| default: |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "%s: unsupported mode\n", |
| __func__); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Given a ORANGEFS object identifier (fsid, handle), convert it into a ino_t type |
| * that will be used as a hash-index from where the handle will |
| * be searched for in the VFS hash table of inodes. |
| */ |
| static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref) |
| { |
| if (!ref) |
| return 0; |
| return orangefs_khandle_to_ino(&(ref->khandle)); |
| } |
| |
| /* |
| * Called to set up an inode from iget5_locked. |
| */ |
| static int orangefs_set_inode(struct inode *inode, void *data) |
| { |
| struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data; |
| ORANGEFS_I(inode)->refn.fs_id = ref->fs_id; |
| ORANGEFS_I(inode)->refn.khandle = ref->khandle; |
| return 0; |
| } |
| |
| /* |
| * Called to determine if handles match. |
| */ |
| static int orangefs_test_inode(struct inode *inode, void *data) |
| { |
| struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data; |
| struct orangefs_inode_s *orangefs_inode = NULL; |
| |
| orangefs_inode = ORANGEFS_I(inode); |
| return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle), &(ref->khandle)) |
| && orangefs_inode->refn.fs_id == ref->fs_id); |
| } |
| |
| /* |
| * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS |
| * file handle. |
| * |
| * @sb: the file system super block instance. |
| * @ref: The ORANGEFS object for which we are trying to locate an inode structure. |
| */ |
| struct inode *orangefs_iget(struct super_block *sb, struct orangefs_object_kref *ref) |
| { |
| struct inode *inode = NULL; |
| unsigned long hash; |
| int error; |
| |
| hash = orangefs_handle_hash(ref); |
| inode = iget5_locked(sb, hash, orangefs_test_inode, orangefs_set_inode, ref); |
| if (!inode || !(inode->i_state & I_NEW)) |
| return inode; |
| |
| error = orangefs_inode_getattr(inode, 1, 0); |
| if (error) { |
| iget_failed(inode); |
| return ERR_PTR(error); |
| } |
| |
| inode->i_ino = hash; /* needed for stat etc */ |
| orangefs_init_iops(inode); |
| unlock_new_inode(inode); |
| |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "iget handle %pU, fsid %d hash %ld i_ino %lu\n", |
| &ref->khandle, |
| ref->fs_id, |
| hash, |
| inode->i_ino); |
| |
| return inode; |
| } |
| |
| /* |
| * Allocate an inode for a newly created file and insert it into the inode hash. |
| */ |
| struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir, |
| int mode, dev_t dev, struct orangefs_object_kref *ref) |
| { |
| unsigned long hash = orangefs_handle_hash(ref); |
| struct inode *inode; |
| int error; |
| |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n", |
| __func__, |
| sb, |
| MAJOR(dev), |
| MINOR(dev), |
| mode); |
| |
| inode = new_inode(sb); |
| if (!inode) |
| return NULL; |
| |
| orangefs_set_inode(inode, ref); |
| inode->i_ino = hash; /* needed for stat etc */ |
| |
| error = orangefs_inode_getattr(inode, 1, 0); |
| if (error) |
| goto out_iput; |
| |
| orangefs_init_iops(inode); |
| |
| inode->i_mode = mode; |
| inode->i_uid = current_fsuid(); |
| inode->i_gid = current_fsgid(); |
| inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| inode->i_size = PAGE_SIZE; |
| inode->i_rdev = dev; |
| |
| error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref); |
| if (error < 0) |
| goto out_iput; |
| |
| gossip_debug(GOSSIP_INODE_DEBUG, |
| "Initializing ACL's for inode %pU\n", |
| get_khandle_from_ino(inode)); |
| orangefs_init_acl(inode, dir); |
| return inode; |
| |
| out_iput: |
| iput(inode); |
| return ERR_PTR(error); |
| } |