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668 lines
18 KiB
668 lines
18 KiB
// 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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/* |
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* Linux VFS file operations. |
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*/ |
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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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|
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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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|
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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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|
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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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|
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ret = service_operation(new_op, "orangefs_flush_racache", |
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get_interruptible_flag(inode)); |
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|
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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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/* |
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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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|
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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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|
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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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|
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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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/* |
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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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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 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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|
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return ret; |
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} |
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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#define mapping_nrpages(idata) ((idata)->nrpages) |
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|
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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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/* |
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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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} |
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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|
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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_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, |
|
.unlocked_ioctl = orangefs_ioctl, |
|
.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, |
|
};
|
|
|