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![Mike Marshall](/assets/img/avatar_default.png)
Orangefs has no open, and orangefs checks file permissions on each file access. Posix requires that file permissions be checked on open and nowhere else. Orangefs-through-the-kernel needs to seem posix compliant. The VFS opens files, even if the filesystem provides no method. We can see if a file was successfully opened for read and or for write by looking at file->f_mode. When writes are flowing from the page cache, file is no longer available. We can trust the VFS to have checked file->f_mode before writing to the page cache. The mode of a file might change between when it is opened and IO commences, or it might be created with an arbitrary mode. We'll make sure we don't hit EACCES during the IO stage by using UID 0. Some of the time we have access without changing to UID 0 - how to check? Signed-off-by: Mike Marshall <hubcap@omnibond.com>
701 lines
18 KiB
C
701 lines
18 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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* Copyright 2018 Omnibond Systems, L.L.C.
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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 file operations.
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*/
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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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#include <linux/fs.h>
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#include <linux/pagemap.h>
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static int flush_racache(struct inode *inode)
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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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int ret;
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gossip_debug(GOSSIP_UTILS_DEBUG,
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"%s: %pU: Handle is %pU | fs_id %d\n", __func__,
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get_khandle_from_ino(inode), &orangefs_inode->refn.khandle,
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orangefs_inode->refn.fs_id);
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new_op = op_alloc(ORANGEFS_VFS_OP_RA_FLUSH);
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if (!new_op)
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return -ENOMEM;
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new_op->upcall.req.ra_cache_flush.refn = orangefs_inode->refn;
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ret = service_operation(new_op, "orangefs_flush_racache",
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get_interruptible_flag(inode));
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gossip_debug(GOSSIP_UTILS_DEBUG, "%s: got return value of %d\n",
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__func__, ret);
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op_release(new_op);
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return ret;
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}
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/*
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* Post and wait for the I/O upcall to finish
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*/
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ssize_t wait_for_direct_io(enum ORANGEFS_io_type type, struct inode *inode,
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loff_t *offset, struct iov_iter *iter, size_t total_size,
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loff_t readahead_size, struct orangefs_write_range *wr,
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int *index_return, struct file *file)
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{
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struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
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struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
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struct orangefs_kernel_op_s *new_op = NULL;
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int buffer_index;
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ssize_t ret;
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size_t copy_amount;
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int open_for_read;
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int open_for_write;
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new_op = op_alloc(ORANGEFS_VFS_OP_FILE_IO);
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if (!new_op)
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return -ENOMEM;
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/* synchronous I/O */
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new_op->upcall.req.io.readahead_size = readahead_size;
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new_op->upcall.req.io.io_type = type;
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new_op->upcall.req.io.refn = orangefs_inode->refn;
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populate_shared_memory:
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/* get a shared buffer index */
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buffer_index = orangefs_bufmap_get();
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if (buffer_index < 0) {
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ret = buffer_index;
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s: orangefs_bufmap_get failure (%zd)\n",
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__func__, ret);
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goto out;
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}
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): GET op %p -> buffer_index %d\n",
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__func__,
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handle,
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new_op,
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buffer_index);
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new_op->uses_shared_memory = 1;
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new_op->upcall.req.io.buf_index = buffer_index;
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new_op->upcall.req.io.count = total_size;
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new_op->upcall.req.io.offset = *offset;
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if (type == ORANGEFS_IO_WRITE && wr) {
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new_op->upcall.uid = from_kuid(&init_user_ns, wr->uid);
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new_op->upcall.gid = from_kgid(&init_user_ns, wr->gid);
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}
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/*
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* Orangefs has no open, and orangefs checks file permissions
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* on each file access. Posix requires that file permissions
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* be checked on open and nowhere else. Orangefs-through-the-kernel
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* needs to seem posix compliant.
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*
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* The VFS opens files, even if the filesystem provides no
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* method. We can see if a file was successfully opened for
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* read and or for write by looking at file->f_mode.
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*
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* When writes are flowing from the page cache, file is no
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* longer available. We can trust the VFS to have checked
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* file->f_mode before writing to the page cache.
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*
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* The mode of a file might change between when it is opened
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* and IO commences, or it might be created with an arbitrary mode.
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*
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* We'll make sure we don't hit EACCES during the IO stage by
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* using UID 0. Some of the time we have access without changing
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* to UID 0 - how to check?
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*/
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if (file) {
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open_for_write = file->f_mode & FMODE_WRITE;
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open_for_read = file->f_mode & FMODE_READ;
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} else {
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open_for_write = 1;
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open_for_read = 0; /* not relevant? */
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}
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if ((type == ORANGEFS_IO_WRITE) && open_for_write)
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new_op->upcall.uid = 0;
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if ((type == ORANGEFS_IO_READ) && open_for_read)
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new_op->upcall.uid = 0;
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): offset: %llu total_size: %zd\n",
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__func__,
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handle,
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llu(*offset),
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total_size);
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/*
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* Stage 1: copy the buffers into client-core's address space
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*/
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if (type == ORANGEFS_IO_WRITE && total_size) {
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ret = orangefs_bufmap_copy_from_iovec(iter, buffer_index,
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total_size);
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if (ret < 0) {
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gossip_err("%s: Failed to copy-in buffers. Please make sure that the pvfs2-client is running. %ld\n",
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__func__, (long)ret);
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goto out;
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}
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}
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): Calling post_io_request with tag (%llu)\n",
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__func__,
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handle,
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llu(new_op->tag));
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/* Stage 2: Service the I/O operation */
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ret = service_operation(new_op,
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type == ORANGEFS_IO_WRITE ?
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"file_write" :
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"file_read",
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get_interruptible_flag(inode));
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/*
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* If service_operation() returns -EAGAIN #and# the operation was
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* purged from orangefs_request_list or htable_ops_in_progress, then
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* we know that the client was restarted, causing the shared memory
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* area to be wiped clean. To restart a write operation in this
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* case, we must re-copy the data from the user's iovec to a NEW
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* shared memory location. To restart a read operation, we must get
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* a new shared memory location.
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*/
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if (ret == -EAGAIN && op_state_purged(new_op)) {
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orangefs_bufmap_put(buffer_index);
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if (type == ORANGEFS_IO_WRITE)
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iov_iter_revert(iter, total_size);
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s:going to repopulate_shared_memory.\n",
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__func__);
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goto populate_shared_memory;
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}
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if (ret < 0) {
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if (ret == -EINTR) {
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/*
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* We can't return EINTR if any data was written,
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* it's not POSIX. It is minimally acceptable
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* to give a partial write, the way NFS does.
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*
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* It would be optimal to return all or nothing,
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* but if a userspace write is bigger than
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* an IO buffer, and the interrupt occurs
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* between buffer writes, that would not be
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* possible.
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*/
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switch (new_op->op_state - OP_VFS_STATE_GIVEN_UP) {
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/*
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* If the op was waiting when the interrupt
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* occurred, then the client-core did not
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* trigger the write.
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*/
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case OP_VFS_STATE_WAITING:
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if (*offset == 0)
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ret = -EINTR;
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else
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ret = 0;
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break;
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/*
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* If the op was in progress when the interrupt
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* occurred, then the client-core was able to
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* trigger the write.
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*/
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case OP_VFS_STATE_INPROGR:
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if (type == ORANGEFS_IO_READ)
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ret = -EINTR;
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else
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ret = total_size;
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break;
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default:
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gossip_err("%s: unexpected op state :%d:.\n",
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__func__,
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new_op->op_state);
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ret = 0;
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break;
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}
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s: got EINTR, state:%d: %p\n",
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__func__,
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new_op->op_state,
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new_op);
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} else {
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gossip_err("%s: error in %s handle %pU, returning %zd\n",
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__func__,
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type == ORANGEFS_IO_READ ?
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"read from" : "write to",
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handle, ret);
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}
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if (orangefs_cancel_op_in_progress(new_op))
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return ret;
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goto out;
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}
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/*
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* Stage 3: Post copy buffers from client-core's address space
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*/
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if (type == ORANGEFS_IO_READ && new_op->downcall.resp.io.amt_complete) {
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/*
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* NOTE: the iovector can either contain addresses which
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* can futher be kernel-space or user-space addresses.
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* or it can pointers to struct page's
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*/
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/*
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* When reading, readahead_size will only be zero when
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* we're doing O_DIRECT, otherwise we got here from
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* orangefs_readpage.
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*
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* If we got here from orangefs_readpage we want to
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* copy either a page or the whole file into the io
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* vector, whichever is smaller.
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*/
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if (readahead_size)
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copy_amount =
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min(new_op->downcall.resp.io.amt_complete,
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(__s64)PAGE_SIZE);
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else
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copy_amount = new_op->downcall.resp.io.amt_complete;
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ret = orangefs_bufmap_copy_to_iovec(iter, buffer_index,
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copy_amount);
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if (ret < 0) {
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gossip_err("%s: Failed to copy-out buffers. Please make sure that the pvfs2-client is running (%ld)\n",
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__func__, (long)ret);
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goto out;
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}
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}
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): Amount %s, returned by the sys-io call:%d\n",
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__func__,
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handle,
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type == ORANGEFS_IO_READ ? "read" : "written",
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(int)new_op->downcall.resp.io.amt_complete);
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ret = new_op->downcall.resp.io.amt_complete;
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out:
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if (buffer_index >= 0) {
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if ((readahead_size) && (type == ORANGEFS_IO_READ)) {
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/* readpage */
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*index_return = buffer_index;
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s: hold on to buffer_index :%d:\n",
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__func__, buffer_index);
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} else {
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/* O_DIRECT */
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orangefs_bufmap_put(buffer_index);
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): PUT buffer_index %d\n",
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__func__, handle, buffer_index);
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}
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}
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op_release(new_op);
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return ret;
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}
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int orangefs_revalidate_mapping(struct inode *inode)
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{
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struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
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struct address_space *mapping = inode->i_mapping;
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unsigned long *bitlock = &orangefs_inode->bitlock;
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int ret;
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while (1) {
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ret = wait_on_bit(bitlock, 1, TASK_KILLABLE);
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if (ret)
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return ret;
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spin_lock(&inode->i_lock);
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if (test_bit(1, bitlock)) {
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spin_unlock(&inode->i_lock);
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continue;
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}
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if (!time_before(jiffies, orangefs_inode->mapping_time))
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break;
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spin_unlock(&inode->i_lock);
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return 0;
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}
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set_bit(1, bitlock);
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smp_wmb();
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spin_unlock(&inode->i_lock);
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unmap_mapping_range(mapping, 0, 0, 0);
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ret = filemap_write_and_wait(mapping);
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if (!ret)
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ret = invalidate_inode_pages2(mapping);
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orangefs_inode->mapping_time = jiffies +
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orangefs_cache_timeout_msecs*HZ/1000;
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clear_bit(1, bitlock);
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smp_mb__after_atomic();
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wake_up_bit(bitlock, 1);
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return ret;
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}
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static ssize_t orangefs_file_read_iter(struct kiocb *iocb,
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struct iov_iter *iter)
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{
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int ret;
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struct orangefs_read_options *ro;
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orangefs_stats.reads++;
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/*
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* Remember how they set "count" in read(2) or pread(2) or whatever -
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* users can use count as a knob to control orangefs io size and later
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* we can try to help them fill as many pages as possible in readpage.
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*/
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if (!iocb->ki_filp->private_data) {
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iocb->ki_filp->private_data = kmalloc(sizeof *ro, GFP_KERNEL);
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if (!iocb->ki_filp->private_data)
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return(ENOMEM);
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ro = iocb->ki_filp->private_data;
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ro->blksiz = iter->count;
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}
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down_read(&file_inode(iocb->ki_filp)->i_rwsem);
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ret = orangefs_revalidate_mapping(file_inode(iocb->ki_filp));
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if (ret)
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goto out;
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ret = generic_file_read_iter(iocb, iter);
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out:
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up_read(&file_inode(iocb->ki_filp)->i_rwsem);
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return ret;
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}
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static ssize_t orangefs_file_write_iter(struct kiocb *iocb,
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struct iov_iter *iter)
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{
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int ret;
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orangefs_stats.writes++;
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if (iocb->ki_pos > i_size_read(file_inode(iocb->ki_filp))) {
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ret = orangefs_revalidate_mapping(file_inode(iocb->ki_filp));
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if (ret)
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return ret;
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}
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ret = generic_file_write_iter(iocb, iter);
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return ret;
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}
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static int orangefs_getflags(struct inode *inode, unsigned long *uval)
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{
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__u64 val = 0;
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int ret;
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ret = orangefs_inode_getxattr(inode,
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"user.pvfs2.meta_hint",
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&val, sizeof(val));
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if (ret < 0 && ret != -ENODATA)
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return ret;
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else if (ret == -ENODATA)
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val = 0;
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*uval = val;
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return 0;
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}
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/*
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* Perform a miscellaneous operation on a file.
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*/
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static long orangefs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = file_inode(file);
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int ret = -ENOTTY;
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__u64 val = 0;
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unsigned long uval;
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gossip_debug(GOSSIP_FILE_DEBUG,
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"orangefs_ioctl: called with cmd %d\n",
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cmd);
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/*
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* we understand some general ioctls on files, such as the immutable
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* and append flags
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*/
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if (cmd == FS_IOC_GETFLAGS) {
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ret = orangefs_getflags(inode, &uval);
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if (ret)
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return ret;
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gossip_debug(GOSSIP_FILE_DEBUG,
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"orangefs_ioctl: FS_IOC_GETFLAGS: %llu\n",
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(unsigned long long)uval);
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return put_user(uval, (int __user *)arg);
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} else if (cmd == FS_IOC_SETFLAGS) {
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unsigned long old_uval;
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ret = 0;
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if (get_user(uval, (int __user *)arg))
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return -EFAULT;
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/*
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* ORANGEFS_MIRROR_FL is set internally when the mirroring mode
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* is turned on for a file. The user is not allowed to turn
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* on this bit, but the bit is present if the user first gets
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* the flags and then updates the flags with some new
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* settings. So, we ignore it in the following edit. bligon.
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*/
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if ((uval & ~ORANGEFS_MIRROR_FL) &
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(~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NOATIME_FL))) {
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gossip_err("orangefs_ioctl: the FS_IOC_SETFLAGS only supports setting one of FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NOATIME_FL\n");
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return -EINVAL;
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}
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ret = orangefs_getflags(inode, &old_uval);
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if (ret)
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return ret;
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ret = vfs_ioc_setflags_prepare(inode, old_uval, uval);
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if (ret)
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return ret;
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val = uval;
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gossip_debug(GOSSIP_FILE_DEBUG,
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"orangefs_ioctl: FS_IOC_SETFLAGS: %llu\n",
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(unsigned long long)val);
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ret = orangefs_inode_setxattr(inode,
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"user.pvfs2.meta_hint",
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&val, sizeof(val), 0);
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}
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return ret;
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}
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static vm_fault_t orangefs_fault(struct vm_fault *vmf)
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{
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struct file *file = vmf->vma->vm_file;
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int ret;
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ret = orangefs_inode_getattr(file->f_mapping->host,
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ORANGEFS_GETATTR_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", __func__, ret);
|
|
return VM_FAULT_SIGBUS;
|
|
}
|
|
return filemap_fault(vmf);
|
|
}
|
|
|
|
static const struct vm_operations_struct orangefs_file_vm_ops = {
|
|
.fault = orangefs_fault,
|
|
.map_pages = filemap_map_pages,
|
|
.page_mkwrite = orangefs_page_mkwrite,
|
|
};
|
|
|
|
/*
|
|
* Memory map a region of a file.
|
|
*/
|
|
static int orangefs_file_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
int ret;
|
|
|
|
ret = orangefs_revalidate_mapping(file_inode(file));
|
|
if (ret)
|
|
return ret;
|
|
|
|
gossip_debug(GOSSIP_FILE_DEBUG,
|
|
"orangefs_file_mmap: called on %s\n",
|
|
(file ?
|
|
(char *)file->f_path.dentry->d_name.name :
|
|
(char *)"Unknown"));
|
|
|
|
/* set the sequential readahead hint */
|
|
vma->vm_flags |= VM_SEQ_READ;
|
|
vma->vm_flags &= ~VM_RAND_READ;
|
|
|
|
file_accessed(file);
|
|
vma->vm_ops = &orangefs_file_vm_ops;
|
|
return 0;
|
|
}
|
|
|
|
#define mapping_nrpages(idata) ((idata)->nrpages)
|
|
|
|
/*
|
|
* Called to notify the module that there are no more references to
|
|
* this file (i.e. no processes have it open).
|
|
*
|
|
* \note Not called when each file is closed.
|
|
*/
|
|
static int orangefs_file_release(struct inode *inode, struct file *file)
|
|
{
|
|
gossip_debug(GOSSIP_FILE_DEBUG,
|
|
"orangefs_file_release: called on %pD\n",
|
|
file);
|
|
|
|
/*
|
|
* remove all associated inode pages from the page cache and
|
|
* readahead cache (if any); this forces an expensive refresh of
|
|
* data for the next caller of mmap (or 'get_block' accesses)
|
|
*/
|
|
if (file_inode(file) &&
|
|
file_inode(file)->i_mapping &&
|
|
mapping_nrpages(&file_inode(file)->i_data)) {
|
|
if (orangefs_features & ORANGEFS_FEATURE_READAHEAD) {
|
|
gossip_debug(GOSSIP_INODE_DEBUG,
|
|
"calling flush_racache on %pU\n",
|
|
get_khandle_from_ino(inode));
|
|
flush_racache(inode);
|
|
gossip_debug(GOSSIP_INODE_DEBUG,
|
|
"flush_racache finished\n");
|
|
}
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Push all data for a specific file onto permanent storage.
|
|
*/
|
|
static int orangefs_fsync(struct file *file,
|
|
loff_t start,
|
|
loff_t end,
|
|
int datasync)
|
|
{
|
|
int ret;
|
|
struct orangefs_inode_s *orangefs_inode =
|
|
ORANGEFS_I(file_inode(file));
|
|
struct orangefs_kernel_op_s *new_op = NULL;
|
|
|
|
ret = filemap_write_and_wait_range(file_inode(file)->i_mapping,
|
|
start, end);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
new_op = op_alloc(ORANGEFS_VFS_OP_FSYNC);
|
|
if (!new_op)
|
|
return -ENOMEM;
|
|
new_op->upcall.req.fsync.refn = orangefs_inode->refn;
|
|
|
|
ret = service_operation(new_op,
|
|
"orangefs_fsync",
|
|
get_interruptible_flag(file_inode(file)));
|
|
|
|
gossip_debug(GOSSIP_FILE_DEBUG,
|
|
"orangefs_fsync got return value of %d\n",
|
|
ret);
|
|
|
|
op_release(new_op);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Change the file pointer position for an instance of an open file.
|
|
*
|
|
* \note If .llseek is overriden, we must acquire lock as described in
|
|
* Documentation/filesystems/locking.rst.
|
|
*
|
|
* Future upgrade could support SEEK_DATA and SEEK_HOLE but would
|
|
* require much changes to the FS
|
|
*/
|
|
static loff_t orangefs_file_llseek(struct file *file, loff_t offset, int origin)
|
|
{
|
|
int ret = -EINVAL;
|
|
struct inode *inode = file_inode(file);
|
|
|
|
if (origin == SEEK_END) {
|
|
/*
|
|
* revalidate the inode's file size.
|
|
* NOTE: We are only interested in file size here,
|
|
* so we set mask accordingly.
|
|
*/
|
|
ret = orangefs_inode_getattr(file->f_mapping->host,
|
|
ORANGEFS_GETATTR_SIZE);
|
|
if (ret == -ESTALE)
|
|
ret = -EIO;
|
|
if (ret) {
|
|
gossip_debug(GOSSIP_FILE_DEBUG,
|
|
"%s:%s:%d calling make bad inode\n",
|
|
__FILE__,
|
|
__func__,
|
|
__LINE__);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
gossip_debug(GOSSIP_FILE_DEBUG,
|
|
"orangefs_file_llseek: offset is %ld | origin is %d"
|
|
" | inode size is %lu\n",
|
|
(long)offset,
|
|
origin,
|
|
(unsigned long)i_size_read(inode));
|
|
|
|
return generic_file_llseek(file, offset, origin);
|
|
}
|
|
|
|
/*
|
|
* Support local locks (locks that only this kernel knows about)
|
|
* if Orangefs was mounted -o local_lock.
|
|
*/
|
|
static int orangefs_lock(struct file *filp, int cmd, struct file_lock *fl)
|
|
{
|
|
int rc = -EINVAL;
|
|
|
|
if (ORANGEFS_SB(file_inode(filp)->i_sb)->flags & ORANGEFS_OPT_LOCAL_LOCK) {
|
|
if (cmd == F_GETLK) {
|
|
rc = 0;
|
|
posix_test_lock(filp, fl);
|
|
} else {
|
|
rc = posix_lock_file(filp, fl, NULL);
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int orangefs_file_open(struct inode * inode, struct file *file)
|
|
{
|
|
file->private_data = NULL;
|
|
return generic_file_open(inode, file);
|
|
}
|
|
|
|
static int orangefs_flush(struct file *file, fl_owner_t id)
|
|
{
|
|
/*
|
|
* This is vfs_fsync_range(file, 0, LLONG_MAX, 0) without the
|
|
* service_operation in orangefs_fsync.
|
|
*
|
|
* Do not send fsync to OrangeFS server on a close. Do send fsync
|
|
* on an explicit fsync call. This duplicates historical OrangeFS
|
|
* behavior.
|
|
*/
|
|
struct inode *inode = file->f_mapping->host;
|
|
int r;
|
|
|
|
kfree(file->private_data);
|
|
file->private_data = NULL;
|
|
|
|
if (inode->i_state & I_DIRTY_TIME) {
|
|
spin_lock(&inode->i_lock);
|
|
inode->i_state &= ~I_DIRTY_TIME;
|
|
spin_unlock(&inode->i_lock);
|
|
mark_inode_dirty_sync(inode);
|
|
}
|
|
|
|
r = filemap_write_and_wait_range(file->f_mapping, 0, LLONG_MAX);
|
|
if (r > 0)
|
|
return 0;
|
|
else
|
|
return r;
|
|
}
|
|
|
|
/** ORANGEFS implementation of VFS file operations */
|
|
const struct file_operations orangefs_file_operations = {
|
|
.llseek = orangefs_file_llseek,
|
|
.read_iter = orangefs_file_read_iter,
|
|
.write_iter = orangefs_file_write_iter,
|
|
.lock = orangefs_lock,
|
|
.unlocked_ioctl = orangefs_ioctl,
|
|
.mmap = orangefs_file_mmap,
|
|
.open = orangefs_file_open,
|
|
.flush = orangefs_flush,
|
|
.release = orangefs_file_release,
|
|
.fsync = orangefs_fsync,
|
|
};
|