568 lines
15 KiB
C
568 lines
15 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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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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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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buffer_index = -1;
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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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orangefs_stats.reads++;
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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 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, "
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"ret:%d:.\n", __func__, ret);
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return VM_FAULT_SIGBUS;
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}
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return filemap_fault(vmf);
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}
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static const struct vm_operations_struct orangefs_file_vm_ops = {
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.fault = orangefs_fault,
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.map_pages = filemap_map_pages,
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.page_mkwrite = orangefs_page_mkwrite,
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};
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/*
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* Memory map a region of a file.
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*/
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static int orangefs_file_mmap(struct file *file, struct vm_area_struct *vma)
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{
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int ret;
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ret = orangefs_revalidate_mapping(file_inode(file));
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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_file_mmap: called on %pD\n", file);
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/* set the sequential readahead hint */
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vma->vm_flags |= VM_SEQ_READ;
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vma->vm_flags &= ~VM_RAND_READ;
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file_accessed(file);
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vma->vm_ops = &orangefs_file_vm_ops;
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return 0;
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}
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#define mapping_nrpages(idata) ((idata)->nrpages)
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/*
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* Called to notify the module that there are no more references to
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* this file (i.e. no processes have it open).
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*
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* \note Not called when each file is closed.
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*/
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static int orangefs_file_release(struct inode *inode, struct file *file)
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{
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gossip_debug(GOSSIP_FILE_DEBUG,
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"orangefs_file_release: called on %pD\n",
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file);
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/*
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* remove all associated inode pages from the page cache and
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* readahead cache (if any); this forces an expensive refresh of
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* data for the next caller of mmap (or 'get_block' accesses)
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*/
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if (file_inode(file) &&
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file_inode(file)->i_mapping &&
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mapping_nrpages(&file_inode(file)->i_data)) {
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if (orangefs_features & ORANGEFS_FEATURE_READAHEAD) {
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gossip_debug(GOSSIP_INODE_DEBUG,
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"calling flush_racache on %pU\n",
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get_khandle_from_ino(inode));
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flush_racache(inode);
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gossip_debug(GOSSIP_INODE_DEBUG,
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"flush_racache finished\n");
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}
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}
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return 0;
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}
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/*
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* Push all data for a specific file onto permanent storage.
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*/
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static int orangefs_fsync(struct file *file,
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loff_t start,
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loff_t end,
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int datasync)
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{
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int ret;
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struct orangefs_inode_s *orangefs_inode =
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ORANGEFS_I(file_inode(file));
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struct orangefs_kernel_op_s *new_op = NULL;
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ret = filemap_write_and_wait_range(file_inode(file)->i_mapping,
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start, end);
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if (ret < 0)
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return ret;
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new_op = op_alloc(ORANGEFS_VFS_OP_FSYNC);
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if (!new_op)
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return -ENOMEM;
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new_op->upcall.req.fsync.refn = orangefs_inode->refn;
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ret = service_operation(new_op,
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"orangefs_fsync",
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get_interruptible_flag(file_inode(file)));
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gossip_debug(GOSSIP_FILE_DEBUG,
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"orangefs_fsync got return value of %d\n",
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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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* Change the file pointer position for an instance of an open file.
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*
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* \note If .llseek is overriden, we must acquire lock as described in
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* Documentation/filesystems/locking.rst.
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*
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* Future upgrade could support SEEK_DATA and SEEK_HOLE but would
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* require much changes to the FS
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*/
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static loff_t orangefs_file_llseek(struct file *file, loff_t offset, int origin)
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{
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int ret = -EINVAL;
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struct inode *inode = file_inode(file);
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if (origin == SEEK_END) {
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/*
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* revalidate the inode's file size.
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* NOTE: We are only interested in file size here,
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* so we set mask accordingly.
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*/
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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_debug(GOSSIP_FILE_DEBUG,
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"%s:%s:%d calling make bad inode\n",
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__FILE__,
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__func__,
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__LINE__);
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return ret;
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}
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}
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gossip_debug(GOSSIP_FILE_DEBUG,
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"orangefs_file_llseek: offset is %ld | origin is %d"
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" | inode size is %lu\n",
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(long)offset,
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origin,
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(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_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.
|
|
*/
|
|
int r;
|
|
|
|
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,
|
|
.mmap = orangefs_file_mmap,
|
|
.open = generic_file_open,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = iter_file_splice_write,
|
|
.flush = orangefs_flush,
|
|
.release = orangefs_file_release,
|
|
.fsync = orangefs_fsync,
|
|
};
|