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-rw-r--r--fs/orangefs/file.c565
1 files changed, 565 insertions, 0 deletions
diff --git a/fs/orangefs/file.c b/fs/orangefs/file.c
new file mode 100644
index 000000000..732661aa2
--- /dev/null
+++ b/fs/orangefs/file.c
@@ -0,0 +1,565 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) 2001 Clemson University and The University of Chicago
+ * Copyright 2018 Omnibond Systems, L.L.C.
+ *
+ * See COPYING in top-level directory.
+ */
+
+/*
+ * Linux VFS file operations.
+ */
+
+#include "protocol.h"
+#include "orangefs-kernel.h"
+#include "orangefs-bufmap.h"
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+
+static int flush_racache(struct inode *inode)
+{
+ struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
+ struct orangefs_kernel_op_s *new_op;
+ int ret;
+
+ gossip_debug(GOSSIP_UTILS_DEBUG,
+ "%s: %pU: Handle is %pU | fs_id %d\n", __func__,
+ get_khandle_from_ino(inode), &orangefs_inode->refn.khandle,
+ orangefs_inode->refn.fs_id);
+
+ new_op = op_alloc(ORANGEFS_VFS_OP_RA_FLUSH);
+ if (!new_op)
+ return -ENOMEM;
+ new_op->upcall.req.ra_cache_flush.refn = orangefs_inode->refn;
+
+ ret = service_operation(new_op, "orangefs_flush_racache",
+ get_interruptible_flag(inode));
+
+ gossip_debug(GOSSIP_UTILS_DEBUG, "%s: got return value of %d\n",
+ __func__, ret);
+
+ op_release(new_op);
+ return ret;
+}
+
+/*
+ * Post and wait for the I/O upcall to finish
+ */
+ssize_t wait_for_direct_io(enum ORANGEFS_io_type type, struct inode *inode,
+ loff_t *offset, struct iov_iter *iter, size_t total_size,
+ loff_t readahead_size, struct orangefs_write_range *wr,
+ int *index_return, struct file *file)
+{
+ struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
+ struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
+ struct orangefs_kernel_op_s *new_op = NULL;
+ int buffer_index;
+ ssize_t ret;
+ size_t copy_amount;
+ int open_for_read;
+ int open_for_write;
+
+ new_op = op_alloc(ORANGEFS_VFS_OP_FILE_IO);
+ if (!new_op)
+ return -ENOMEM;
+
+ /* synchronous I/O */
+ new_op->upcall.req.io.readahead_size = readahead_size;
+ new_op->upcall.req.io.io_type = type;
+ new_op->upcall.req.io.refn = orangefs_inode->refn;
+
+populate_shared_memory:
+ /* get a shared buffer index */
+ buffer_index = orangefs_bufmap_get();
+ if (buffer_index < 0) {
+ ret = buffer_index;
+ gossip_debug(GOSSIP_FILE_DEBUG,
+ "%s: orangefs_bufmap_get failure (%zd)\n",
+ __func__, ret);
+ goto out;
+ }
+ gossip_debug(GOSSIP_FILE_DEBUG,
+ "%s(%pU): GET op %p -> buffer_index %d\n",
+ __func__,
+ handle,
+ new_op,
+ buffer_index);
+
+ new_op->uses_shared_memory = 1;
+ new_op->upcall.req.io.buf_index = buffer_index;
+ new_op->upcall.req.io.count = total_size;
+ new_op->upcall.req.io.offset = *offset;
+ if (type == ORANGEFS_IO_WRITE && wr) {
+ new_op->upcall.uid = from_kuid(&init_user_ns, wr->uid);
+ new_op->upcall.gid = from_kgid(&init_user_ns, wr->gid);
+ }
+ /*
+ * 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?
+ */
+ if (file) {
+ open_for_write = file->f_mode & FMODE_WRITE;
+ open_for_read = file->f_mode & FMODE_READ;
+ } else {
+ open_for_write = 1;
+ open_for_read = 0; /* not relevant? */
+ }
+ if ((type == ORANGEFS_IO_WRITE) && open_for_write)
+ new_op->upcall.uid = 0;
+ if ((type == ORANGEFS_IO_READ) && open_for_read)
+ new_op->upcall.uid = 0;
+
+ gossip_debug(GOSSIP_FILE_DEBUG,
+ "%s(%pU): offset: %llu total_size: %zd\n",
+ __func__,
+ handle,
+ llu(*offset),
+ total_size);
+ /*
+ * Stage 1: copy the buffers into client-core's address space
+ */
+ if (type == ORANGEFS_IO_WRITE && total_size) {
+ ret = orangefs_bufmap_copy_from_iovec(iter, buffer_index,
+ total_size);
+ if (ret < 0) {
+ gossip_err("%s: Failed to copy-in buffers. Please make sure that the pvfs2-client is running. %ld\n",
+ __func__, (long)ret);
+ goto out;
+ }
+ }
+
+ gossip_debug(GOSSIP_FILE_DEBUG,
+ "%s(%pU): Calling post_io_request with tag (%llu)\n",
+ __func__,
+ handle,
+ llu(new_op->tag));
+
+ /* Stage 2: Service the I/O operation */
+ ret = service_operation(new_op,
+ type == ORANGEFS_IO_WRITE ?
+ "file_write" :
+ "file_read",
+ get_interruptible_flag(inode));
+
+ /*
+ * If service_operation() returns -EAGAIN #and# the operation was
+ * purged from orangefs_request_list or htable_ops_in_progress, then
+ * we know that the client was restarted, causing the shared memory
+ * area to be wiped clean. To restart a write operation in this
+ * case, we must re-copy the data from the user's iovec to a NEW
+ * shared memory location. To restart a read operation, we must get
+ * a new shared memory location.
+ */
+ if (ret == -EAGAIN && op_state_purged(new_op)) {
+ orangefs_bufmap_put(buffer_index);
+ if (type == ORANGEFS_IO_WRITE)
+ iov_iter_revert(iter, total_size);
+ gossip_debug(GOSSIP_FILE_DEBUG,
+ "%s:going to repopulate_shared_memory.\n",
+ __func__);
+ goto populate_shared_memory;
+ }
+
+ if (ret < 0) {
+ if (ret == -EINTR) {
+ /*
+ * We can't return EINTR if any data was written,
+ * it's not POSIX. It is minimally acceptable
+ * to give a partial write, the way NFS does.
+ *
+ * It would be optimal to return all or nothing,
+ * but if a userspace write is bigger than
+ * an IO buffer, and the interrupt occurs
+ * between buffer writes, that would not be
+ * possible.
+ */
+ switch (new_op->op_state - OP_VFS_STATE_GIVEN_UP) {
+ /*
+ * If the op was waiting when the interrupt
+ * occurred, then the client-core did not
+ * trigger the write.
+ */
+ case OP_VFS_STATE_WAITING:
+ if (*offset == 0)
+ ret = -EINTR;
+ else
+ ret = 0;
+ break;
+ /*
+ * If the op was in progress when the interrupt
+ * occurred, then the client-core was able to
+ * trigger the write.
+ */
+ case OP_VFS_STATE_INPROGR:
+ if (type == ORANGEFS_IO_READ)
+ ret = -EINTR;
+ else
+ ret = total_size;
+ break;
+ default:
+ gossip_err("%s: unexpected op state :%d:.\n",
+ __func__,
+ new_op->op_state);
+ ret = 0;
+ break;
+ }
+ gossip_debug(GOSSIP_FILE_DEBUG,
+ "%s: got EINTR, state:%d: %p\n",
+ __func__,
+ new_op->op_state,
+ new_op);
+ } else {
+ gossip_err("%s: error in %s handle %pU, returning %zd\n",
+ __func__,
+ type == ORANGEFS_IO_READ ?
+ "read from" : "write to",
+ handle, ret);
+ }
+ if (orangefs_cancel_op_in_progress(new_op))
+ return ret;
+
+ goto out;
+ }
+
+ /*
+ * Stage 3: Post copy buffers from client-core's address space
+ */
+ if (type == ORANGEFS_IO_READ && new_op->downcall.resp.io.amt_complete) {
+ /*
+ * NOTE: the iovector can either contain addresses which
+ * can futher be kernel-space or user-space addresses.
+ * or it can pointers to struct page's
+ */
+
+ copy_amount = new_op->downcall.resp.io.amt_complete;
+
+ ret = orangefs_bufmap_copy_to_iovec(iter, buffer_index,
+ copy_amount);
+ if (ret < 0) {
+ gossip_err("%s: Failed to copy-out buffers. Please make sure that the pvfs2-client is running (%ld)\n",
+ __func__, (long)ret);
+ goto out;
+ }
+ }
+ gossip_debug(GOSSIP_FILE_DEBUG,
+ "%s(%pU): Amount %s, returned by the sys-io call:%d\n",
+ __func__,
+ handle,
+ type == ORANGEFS_IO_READ ? "read" : "written",
+ (int)new_op->downcall.resp.io.amt_complete);
+
+ ret = new_op->downcall.resp.io.amt_complete;
+
+out:
+ if (buffer_index >= 0) {
+ orangefs_bufmap_put(buffer_index);
+ gossip_debug(GOSSIP_FILE_DEBUG,
+ "%s(%pU): PUT buffer_index %d\n",
+ __func__, handle, buffer_index);
+ buffer_index = -1;
+ }
+ op_release(new_op);
+ return ret;
+}
+
+int orangefs_revalidate_mapping(struct inode *inode)
+{
+ struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
+ struct address_space *mapping = inode->i_mapping;
+ unsigned long *bitlock = &orangefs_inode->bitlock;
+ int ret;
+
+ while (1) {
+ ret = wait_on_bit(bitlock, 1, TASK_KILLABLE);
+ if (ret)
+ return ret;
+ spin_lock(&inode->i_lock);
+ if (test_bit(1, bitlock)) {
+ spin_unlock(&inode->i_lock);
+ continue;
+ }
+ if (!time_before(jiffies, orangefs_inode->mapping_time))
+ break;
+ spin_unlock(&inode->i_lock);
+ return 0;
+ }
+
+ set_bit(1, bitlock);
+ smp_wmb();
+ spin_unlock(&inode->i_lock);
+
+ unmap_mapping_range(mapping, 0, 0, 0);
+ ret = filemap_write_and_wait(mapping);
+ if (!ret)
+ ret = invalidate_inode_pages2(mapping);
+
+ orangefs_inode->mapping_time = jiffies +
+ orangefs_cache_timeout_msecs*HZ/1000;
+
+ clear_bit(1, bitlock);
+ smp_mb__after_atomic();
+ wake_up_bit(bitlock, 1);
+
+ return ret;
+}
+
+static ssize_t orangefs_file_read_iter(struct kiocb *iocb,
+ struct iov_iter *iter)
+{
+ int ret;
+ orangefs_stats.reads++;
+
+ down_read(&file_inode(iocb->ki_filp)->i_rwsem);
+ ret = orangefs_revalidate_mapping(file_inode(iocb->ki_filp));
+ if (ret)
+ goto out;
+
+ ret = generic_file_read_iter(iocb, iter);
+out:
+ up_read(&file_inode(iocb->ki_filp)->i_rwsem);
+ return ret;
+}
+
+static ssize_t orangefs_file_write_iter(struct kiocb *iocb,
+ struct iov_iter *iter)
+{
+ int ret;
+ orangefs_stats.writes++;
+
+ if (iocb->ki_pos > i_size_read(file_inode(iocb->ki_filp))) {
+ ret = orangefs_revalidate_mapping(file_inode(iocb->ki_filp));
+ if (ret)
+ return ret;
+ }
+
+ ret = generic_file_write_iter(iocb, iter);
+ return ret;
+}
+
+static vm_fault_t orangefs_fault(struct vm_fault *vmf)
+{
+ struct file *file = vmf->vma->vm_file;
+ int ret;
+ ret = orangefs_inode_getattr(file->f_mapping->host,
+ ORANGEFS_GETATTR_SIZE);
+ if (ret == -ESTALE)
+ ret = -EIO;
+ if (ret) {
+ 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 %pD\n", file);
+
+ /* 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 (mapping_nrpages(file->f_mapping)) {
+ 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_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,
+};
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