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![Martin Brandenburg](/assets/img/avatar_default.png)
Signed-off-by: Martin Brandenburg <martin@omnibond.com> Signed-off-by: Mike Marshall <hubcap@omnibond.com>
472 lines
12 KiB
C
472 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* (C) 2001 Clemson University and The University of Chicago
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*
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* See COPYING in top-level directory.
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*/
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/*
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* Linux VFS inode operations.
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*/
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#include <linux/bvec.h>
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#include "protocol.h"
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#include "orangefs-kernel.h"
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#include "orangefs-bufmap.h"
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static int read_one_page(struct page *page)
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{
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int ret;
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int max_block;
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ssize_t bytes_read = 0;
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struct inode *inode = page->mapping->host;
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const __u32 blocksize = PAGE_SIZE; /* inode->i_blksize */
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const __u32 blockbits = PAGE_SHIFT; /* inode->i_blkbits */
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struct iov_iter to;
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struct bio_vec bv = {.bv_page = page, .bv_len = PAGE_SIZE};
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iov_iter_bvec(&to, ITER_BVEC | READ, &bv, 1, PAGE_SIZE);
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gossip_debug(GOSSIP_INODE_DEBUG,
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"orangefs_readpage called with page %p\n",
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page);
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max_block = ((inode->i_size / blocksize) + 1);
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if (page->index < max_block) {
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loff_t blockptr_offset = (((loff_t) page->index) << blockbits);
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bytes_read = orangefs_inode_read(inode,
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&to,
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&blockptr_offset,
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inode->i_size);
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}
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/* this will only zero remaining unread portions of the page data */
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iov_iter_zero(~0U, &to);
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/* takes care of potential aliasing */
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flush_dcache_page(page);
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if (bytes_read < 0) {
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ret = bytes_read;
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SetPageError(page);
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} else {
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SetPageUptodate(page);
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if (PageError(page))
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ClearPageError(page);
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ret = 0;
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}
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/* unlock the page after the ->readpage() routine completes */
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unlock_page(page);
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return ret;
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}
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static int orangefs_readpage(struct file *file, struct page *page)
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{
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return read_one_page(page);
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}
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static int orangefs_readpages(struct file *file,
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struct address_space *mapping,
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struct list_head *pages,
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unsigned nr_pages)
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{
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int page_idx;
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int ret;
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gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_readpages called\n");
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for (page_idx = 0; page_idx < nr_pages; page_idx++) {
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struct page *page;
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page = list_entry(pages->prev, struct page, lru);
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list_del(&page->lru);
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if (!add_to_page_cache(page,
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mapping,
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page->index,
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readahead_gfp_mask(mapping))) {
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ret = read_one_page(page);
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gossip_debug(GOSSIP_INODE_DEBUG,
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"failure adding page to cache, read_one_page returned: %d\n",
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ret);
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} else {
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put_page(page);
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}
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}
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BUG_ON(!list_empty(pages));
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return 0;
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}
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static void orangefs_invalidatepage(struct page *page,
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unsigned int offset,
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unsigned int length)
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{
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gossip_debug(GOSSIP_INODE_DEBUG,
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"orangefs_invalidatepage called on page %p "
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"(offset is %u)\n",
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page,
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offset);
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ClearPageUptodate(page);
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ClearPageMappedToDisk(page);
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return;
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}
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static int orangefs_releasepage(struct page *page, gfp_t foo)
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{
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gossip_debug(GOSSIP_INODE_DEBUG,
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"orangefs_releasepage called on page %p\n",
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page);
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return 0;
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}
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/*
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* Having a direct_IO entry point in the address_space_operations
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* struct causes the kernel to allows us to use O_DIRECT on
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* open. Nothing will ever call this thing, but in the future we
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* will need to be able to use O_DIRECT on open in order to support
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* AIO. Modeled after NFS, they do this too.
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*/
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static ssize_t orangefs_direct_IO(struct kiocb *iocb,
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struct iov_iter *iter)
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{
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gossip_debug(GOSSIP_INODE_DEBUG,
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"orangefs_direct_IO: %pD\n",
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iocb->ki_filp);
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return -EINVAL;
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}
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/** ORANGEFS2 implementation of address space operations */
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static const struct address_space_operations orangefs_address_operations = {
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.readpage = orangefs_readpage,
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.readpages = orangefs_readpages,
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.invalidatepage = orangefs_invalidatepage,
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.releasepage = orangefs_releasepage,
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.direct_IO = orangefs_direct_IO,
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};
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static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
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{
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struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
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struct orangefs_kernel_op_s *new_op;
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loff_t orig_size;
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int ret = -EINVAL;
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gossip_debug(GOSSIP_INODE_DEBUG,
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"%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
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__func__,
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get_khandle_from_ino(inode),
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&orangefs_inode->refn.khandle,
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orangefs_inode->refn.fs_id,
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iattr->ia_size);
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/* Ensure that we have a up to date size, so we know if it changed. */
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ret = orangefs_inode_getattr(inode, 0, 1, STATX_SIZE);
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if (ret == -ESTALE)
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ret = -EIO;
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if (ret) {
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gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
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__func__, ret);
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return ret;
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}
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orig_size = i_size_read(inode);
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truncate_setsize(inode, iattr->ia_size);
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new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
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if (!new_op)
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return -ENOMEM;
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new_op->upcall.req.truncate.refn = orangefs_inode->refn;
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new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
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ret = service_operation(new_op, __func__,
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get_interruptible_flag(inode));
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/*
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* the truncate has no downcall members to retrieve, but
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* the status value tells us if it went through ok or not
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*/
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gossip_debug(GOSSIP_INODE_DEBUG,
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"orangefs: orangefs_truncate got return value of %d\n",
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ret);
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op_release(new_op);
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if (ret != 0)
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return ret;
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if (orig_size != i_size_read(inode))
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iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
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return ret;
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}
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/*
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* Change attributes of an object referenced by dentry.
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*/
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int orangefs_setattr(struct dentry *dentry, struct iattr *iattr)
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{
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int ret = -EINVAL;
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struct inode *inode = dentry->d_inode;
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gossip_debug(GOSSIP_INODE_DEBUG,
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"orangefs_setattr: called on %pd\n",
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dentry);
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ret = setattr_prepare(dentry, iattr);
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if (ret)
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goto out;
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if (iattr->ia_valid & ATTR_SIZE) {
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ret = orangefs_setattr_size(inode, iattr);
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if (ret)
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goto out;
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}
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setattr_copy(inode, iattr);
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mark_inode_dirty(inode);
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ret = orangefs_inode_setattr(inode, iattr);
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gossip_debug(GOSSIP_INODE_DEBUG,
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"orangefs_setattr: inode_setattr returned %d\n",
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ret);
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if (!ret && (iattr->ia_valid & ATTR_MODE))
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/* change mod on a file that has ACLs */
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ret = posix_acl_chmod(inode, inode->i_mode);
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out:
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gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n", ret);
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return ret;
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}
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/*
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* Obtain attributes of an object given a dentry
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*/
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int orangefs_getattr(const struct path *path, struct kstat *stat,
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u32 request_mask, unsigned int flags)
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{
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int ret = -ENOENT;
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struct inode *inode = path->dentry->d_inode;
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struct orangefs_inode_s *orangefs_inode = NULL;
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gossip_debug(GOSSIP_INODE_DEBUG,
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"orangefs_getattr: called on %pd\n",
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path->dentry);
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ret = orangefs_inode_getattr(inode, 0, 0, request_mask);
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if (ret == 0) {
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generic_fillattr(inode, stat);
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/* override block size reported to stat */
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orangefs_inode = ORANGEFS_I(inode);
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stat->blksize = orangefs_inode->blksize;
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if (request_mask & STATX_SIZE)
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stat->result_mask = STATX_BASIC_STATS;
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else
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stat->result_mask = STATX_BASIC_STATS &
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~STATX_SIZE;
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}
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return ret;
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}
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int orangefs_permission(struct inode *inode, int mask)
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{
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int ret;
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if (mask & MAY_NOT_BLOCK)
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return -ECHILD;
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gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
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/* Make sure the permission (and other common attrs) are up to date. */
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ret = orangefs_inode_getattr(inode, 0, 0, STATX_MODE);
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if (ret < 0)
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return ret;
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return generic_permission(inode, mask);
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}
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int orangefs_update_time(struct inode *inode, struct timespec *time, int flags)
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{
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struct iattr iattr;
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gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
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get_khandle_from_ino(inode));
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generic_update_time(inode, time, flags);
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memset(&iattr, 0, sizeof iattr);
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if (flags & S_ATIME)
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iattr.ia_valid |= ATTR_ATIME;
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if (flags & S_CTIME)
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iattr.ia_valid |= ATTR_CTIME;
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if (flags & S_MTIME)
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iattr.ia_valid |= ATTR_MTIME;
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return orangefs_inode_setattr(inode, &iattr);
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}
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/* ORANGEDS2 implementation of VFS inode operations for files */
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static const struct inode_operations orangefs_file_inode_operations = {
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.get_acl = orangefs_get_acl,
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.set_acl = orangefs_set_acl,
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.setattr = orangefs_setattr,
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.getattr = orangefs_getattr,
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.listxattr = orangefs_listxattr,
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.permission = orangefs_permission,
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.update_time = orangefs_update_time,
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};
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static int orangefs_init_iops(struct inode *inode)
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{
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inode->i_mapping->a_ops = &orangefs_address_operations;
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switch (inode->i_mode & S_IFMT) {
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case S_IFREG:
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inode->i_op = &orangefs_file_inode_operations;
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inode->i_fop = &orangefs_file_operations;
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inode->i_blkbits = PAGE_SHIFT;
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break;
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case S_IFLNK:
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inode->i_op = &orangefs_symlink_inode_operations;
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break;
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case S_IFDIR:
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inode->i_op = &orangefs_dir_inode_operations;
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inode->i_fop = &orangefs_dir_operations;
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break;
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default:
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gossip_debug(GOSSIP_INODE_DEBUG,
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"%s: unsupported mode\n",
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__func__);
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return -EINVAL;
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}
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return 0;
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}
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/*
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* Given a ORANGEFS object identifier (fsid, handle), convert it into a ino_t type
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* that will be used as a hash-index from where the handle will
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* be searched for in the VFS hash table of inodes.
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*/
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static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
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{
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if (!ref)
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return 0;
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return orangefs_khandle_to_ino(&(ref->khandle));
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}
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/*
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* Called to set up an inode from iget5_locked.
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*/
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static int orangefs_set_inode(struct inode *inode, void *data)
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{
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struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
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ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
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ORANGEFS_I(inode)->refn.khandle = ref->khandle;
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return 0;
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}
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/*
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* Called to determine if handles match.
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*/
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static int orangefs_test_inode(struct inode *inode, void *data)
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{
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struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
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struct orangefs_inode_s *orangefs_inode = NULL;
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orangefs_inode = ORANGEFS_I(inode);
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return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle), &(ref->khandle))
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&& orangefs_inode->refn.fs_id == ref->fs_id);
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}
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/*
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* Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
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* file handle.
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*
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* @sb: the file system super block instance.
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* @ref: The ORANGEFS object for which we are trying to locate an inode structure.
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*/
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struct inode *orangefs_iget(struct super_block *sb, struct orangefs_object_kref *ref)
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{
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struct inode *inode = NULL;
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unsigned long hash;
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int error;
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hash = orangefs_handle_hash(ref);
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inode = iget5_locked(sb, hash, orangefs_test_inode, orangefs_set_inode, ref);
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if (!inode || !(inode->i_state & I_NEW))
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return inode;
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error = orangefs_inode_getattr(inode, 1, 1, STATX_ALL);
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if (error) {
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iget_failed(inode);
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return ERR_PTR(error);
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}
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inode->i_ino = hash; /* needed for stat etc */
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orangefs_init_iops(inode);
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unlock_new_inode(inode);
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gossip_debug(GOSSIP_INODE_DEBUG,
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"iget handle %pU, fsid %d hash %ld i_ino %lu\n",
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&ref->khandle,
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ref->fs_id,
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hash,
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inode->i_ino);
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return inode;
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}
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/*
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* Allocate an inode for a newly created file and insert it into the inode hash.
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*/
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struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
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int mode, dev_t dev, struct orangefs_object_kref *ref)
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{
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unsigned long hash = orangefs_handle_hash(ref);
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struct inode *inode;
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int error;
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gossip_debug(GOSSIP_INODE_DEBUG,
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"%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
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__func__,
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sb,
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MAJOR(dev),
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MINOR(dev),
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mode);
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inode = new_inode(sb);
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if (!inode)
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return NULL;
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orangefs_set_inode(inode, ref);
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inode->i_ino = hash; /* needed for stat etc */
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error = orangefs_inode_getattr(inode, 1, 1, STATX_ALL);
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if (error)
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goto out_iput;
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orangefs_init_iops(inode);
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inode->i_mode = mode;
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inode->i_uid = current_fsuid();
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inode->i_gid = current_fsgid();
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inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
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inode->i_size = PAGE_SIZE;
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inode->i_rdev = dev;
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error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
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if (error < 0)
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goto out_iput;
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gossip_debug(GOSSIP_INODE_DEBUG,
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"Initializing ACL's for inode %pU\n",
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get_khandle_from_ino(inode));
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orangefs_init_acl(inode, dir);
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return inode;
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out_iput:
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iput(inode);
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return ERR_PTR(error);
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}
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