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6d4c1a30b3
Error should only be returned if nothing had been read/written. Otherwise we need to report a short read/write instead. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Mike Marshall <hubcap@omnibond.com>
717 lines
18 KiB
C
717 lines
18 KiB
C
/*
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* (C) 2001 Clemson University and The University of Chicago
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*
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* See COPYING in top-level directory.
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*/
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/*
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* Linux VFS 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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/*
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* Copy to client-core's address space from the buffers specified
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* by the iovec upto total_size bytes.
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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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static int precopy_buffers(int buffer_index,
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struct iov_iter *iter,
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size_t total_size)
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{
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int ret = 0;
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/*
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* copy data from application/kernel by pulling it out
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* of the iovec.
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*/
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if (total_size) {
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ret = orangefs_bufmap_copy_from_iovec(iter,
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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__,
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(long)ret);
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}
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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__,
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(long)ret);
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return ret;
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}
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/*
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* Copy from client-core's address space to the buffers specified
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* by the iovec upto total_size bytes.
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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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static int postcopy_buffers(int buffer_index,
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struct iov_iter *iter,
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size_t total_size)
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{
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int ret = 0;
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/*
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* copy data to application/kernel by pushing it out to
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* the iovec. NOTE; target buffers can be addresses or
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* struct page pointers.
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*/
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if (total_size) {
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ret = orangefs_bufmap_copy_to_iovec(iter,
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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-out buffers. Please make sure that the pvfs2-client is running (%ld)\n",
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__func__,
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(long)ret);
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}
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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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static 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,
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size_t total_size, loff_t readahead_size)
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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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struct iov_iter saved = *iter;
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int buffer_index = -1;
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ssize_t ret;
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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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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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* precopy_buffers only pertains to writes.
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*/
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if (type == ORANGEFS_IO_WRITE) {
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ret = precopy_buffers(buffer_index,
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iter,
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total_size);
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if (ret < 0)
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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): 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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buffer_index = -1;
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if (type == ORANGEFS_IO_WRITE)
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*iter = saved;
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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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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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* postcopy_buffers only pertains to reads.
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*/
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if (type == ORANGEFS_IO_READ) {
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ret = postcopy_buffers(buffer_index,
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iter,
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new_op->downcall.resp.io.amt_complete);
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if (ret < 0)
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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): 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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/*
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* Common entry point for read/write/readv/writev
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* This function will dispatch it to either the direct I/O
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* or buffered I/O path depending on the mount options and/or
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* augmented/extended metadata attached to the file.
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* Note: File extended attributes override any mount options.
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*/
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static ssize_t do_readv_writev(enum ORANGEFS_io_type type, struct file *file,
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loff_t *offset, struct iov_iter *iter)
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{
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struct inode *inode = file->f_mapping->host;
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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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size_t count = iov_iter_count(iter);
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ssize_t total_count = 0;
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ssize_t ret = -EINVAL;
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s-BEGIN(%pU): count(%d) after estimate_max_iovecs.\n",
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__func__,
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handle,
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(int)count);
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if (type == ORANGEFS_IO_WRITE) {
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): proceeding with offset : %llu, "
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"size %d\n",
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__func__,
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handle,
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llu(*offset),
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(int)count);
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}
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if (count == 0) {
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ret = 0;
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goto out;
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}
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while (iov_iter_count(iter)) {
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size_t each_count = iov_iter_count(iter);
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size_t amt_complete;
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/* how much to transfer in this loop iteration */
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if (each_count > orangefs_bufmap_size_query())
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each_count = orangefs_bufmap_size_query();
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): size of each_count(%d)\n",
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__func__,
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handle,
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(int)each_count);
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): BEFORE wait_for_io: offset is %d\n",
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__func__,
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handle,
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(int)*offset);
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ret = wait_for_direct_io(type, inode, offset, iter,
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each_count, 0);
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): return from wait_for_io:%d\n",
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__func__,
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handle,
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(int)ret);
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if (ret < 0)
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goto out;
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*offset += ret;
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total_count += ret;
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amt_complete = ret;
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): AFTER wait_for_io: offset is %d\n",
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__func__,
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handle,
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(int)*offset);
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/*
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* if we got a short I/O operations,
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* fall out and return what we got so far
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*/
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if (amt_complete < each_count)
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break;
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} /*end while */
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out:
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if (total_count > 0)
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ret = total_count;
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if (ret > 0) {
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if (type == ORANGEFS_IO_READ) {
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file_accessed(file);
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} else {
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SetMtimeFlag(orangefs_inode);
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inode->i_mtime = CURRENT_TIME;
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mark_inode_dirty_sync(inode);
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}
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}
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): Value(%d) returned.\n",
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__func__,
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handle,
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(int)ret);
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return ret;
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}
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/*
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* Read data from a specified offset in a file (referenced by inode).
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* Data may be placed either in a user or kernel buffer.
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*/
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ssize_t orangefs_inode_read(struct inode *inode,
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struct iov_iter *iter,
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loff_t *offset,
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loff_t readahead_size)
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{
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struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
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size_t count = iov_iter_count(iter);
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size_t bufmap_size;
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ssize_t ret = -EINVAL;
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g_orangefs_stats.reads++;
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bufmap_size = orangefs_bufmap_size_query();
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if (count > bufmap_size) {
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s: count is too large (%zd/%zd)!\n",
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__func__, count, bufmap_size);
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return -EINVAL;
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}
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU) %zd@%llu\n",
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__func__,
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&orangefs_inode->refn.khandle,
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count,
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llu(*offset));
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ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, offset, iter,
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count, readahead_size);
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if (ret > 0)
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*offset += ret;
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gossip_debug(GOSSIP_FILE_DEBUG,
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"%s(%pU): Value(%zd) returned.\n",
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__func__,
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&orangefs_inode->refn.khandle,
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ret);
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return ret;
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}
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static ssize_t orangefs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
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{
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struct file *file = iocb->ki_filp;
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loff_t pos = *(&iocb->ki_pos);
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ssize_t rc = 0;
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BUG_ON(iocb->private);
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gossip_debug(GOSSIP_FILE_DEBUG, "orangefs_file_read_iter\n");
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g_orangefs_stats.reads++;
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rc = do_readv_writev(ORANGEFS_IO_READ, file, &pos, iter);
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iocb->ki_pos = pos;
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return rc;
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}
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static ssize_t orangefs_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
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{
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struct file *file = iocb->ki_filp;
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loff_t pos;
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ssize_t rc;
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BUG_ON(iocb->private);
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gossip_debug(GOSSIP_FILE_DEBUG, "orangefs_file_write_iter\n");
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mutex_lock(&file->f_mapping->host->i_mutex);
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/* Make sure generic_write_checks sees an up to date inode size. */
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if (file->f_flags & O_APPEND) {
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rc = orangefs_inode_getattr(file->f_mapping->host, 0, 1);
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if (rc == -ESTALE)
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rc = -EIO;
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if (rc) {
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gossip_err("%s: orangefs_inode_getattr failed, "
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"rc:%zd:.\n", __func__, rc);
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goto out;
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}
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}
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if (file->f_pos > i_size_read(file->f_mapping->host))
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orangefs_i_size_write(file->f_mapping->host, file->f_pos);
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rc = generic_write_checks(iocb, iter);
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if (rc <= 0) {
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gossip_err("%s: generic_write_checks failed, rc:%zd:.\n",
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__func__, rc);
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goto out;
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}
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/*
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* if we are appending, generic_write_checks would have updated
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* pos to the end of the file, so we will wait till now to set
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* pos...
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*/
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pos = *(&iocb->ki_pos);
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rc = do_readv_writev(ORANGEFS_IO_WRITE,
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file,
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&pos,
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iter);
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if (rc < 0) {
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gossip_err("%s: do_readv_writev failed, rc:%zd:.\n",
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__func__, rc);
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goto out;
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}
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iocb->ki_pos = pos;
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g_orangefs_stats.writes++;
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out:
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mutex_unlock(&file->f_mapping->host->i_mutex);
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return rc;
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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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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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val = 0;
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ret = orangefs_inode_getxattr(file_inode(file),
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ORANGEFS_XATTR_NAME_DEFAULT_PREFIX,
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"user.pvfs2.meta_hint",
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&val, sizeof(val));
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|
if (ret < 0 && ret != -ENODATA)
|
|
return ret;
|
|
else if (ret == -ENODATA)
|
|
val = 0;
|
|
uval = val;
|
|
gossip_debug(GOSSIP_FILE_DEBUG,
|
|
"orangefs_ioctl: FS_IOC_GETFLAGS: %llu\n",
|
|
(unsigned long long)uval);
|
|
return put_user(uval, (int __user *)arg);
|
|
} else if (cmd == FS_IOC_SETFLAGS) {
|
|
ret = 0;
|
|
if (get_user(uval, (int __user *)arg))
|
|
return -EFAULT;
|
|
/*
|
|
* ORANGEFS_MIRROR_FL is set internally when the mirroring mode
|
|
* is turned on for a file. The user is not allowed to turn
|
|
* on this bit, but the bit is present if the user first gets
|
|
* the flags and then updates the flags with some new
|
|
* settings. So, we ignore it in the following edit. bligon.
|
|
*/
|
|
if ((uval & ~ORANGEFS_MIRROR_FL) &
|
|
(~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NOATIME_FL))) {
|
|
gossip_err("orangefs_ioctl: the FS_IOC_SETFLAGS only supports setting one of FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NOATIME_FL\n");
|
|
return -EINVAL;
|
|
}
|
|
val = uval;
|
|
gossip_debug(GOSSIP_FILE_DEBUG,
|
|
"orangefs_ioctl: FS_IOC_SETFLAGS: %llu\n",
|
|
(unsigned long long)val);
|
|
ret = orangefs_inode_setxattr(file_inode(file),
|
|
ORANGEFS_XATTR_NAME_DEFAULT_PREFIX,
|
|
"user.pvfs2.meta_hint",
|
|
&val, sizeof(val), 0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Memory map a region of a file.
|
|
*/
|
|
static int orangefs_file_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
gossip_debug(GOSSIP_FILE_DEBUG,
|
|
"orangefs_file_mmap: called on %s\n",
|
|
(file ?
|
|
(char *)file->f_path.dentry->d_name.name :
|
|
(char *)"Unknown"));
|
|
|
|
/* set the sequential readahead hint */
|
|
vma->vm_flags |= VM_SEQ_READ;
|
|
vma->vm_flags &= ~VM_RAND_READ;
|
|
|
|
/* Use readonly mmap since we cannot support writable maps. */
|
|
return generic_file_readonly_mmap(file, vma);
|
|
}
|
|
|
|
#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 %s\n",
|
|
file->f_path.dentry->d_name.name);
|
|
|
|
orangefs_flush_inode(inode);
|
|
|
|
/*
|
|
* remove all associated inode pages from the page cache and mmap
|
|
* readahead cache (if any); this forces an expensive refresh of
|
|
* data for the next caller of mmap (or 'get_block' accesses)
|
|
*/
|
|
if (file->f_path.dentry->d_inode &&
|
|
file->f_path.dentry->d_inode->i_mapping &&
|
|
mapping_nrpages(&file->f_path.dentry->d_inode->i_data))
|
|
truncate_inode_pages(file->f_path.dentry->d_inode->i_mapping,
|
|
0);
|
|
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 = -EINVAL;
|
|
struct orangefs_inode_s *orangefs_inode =
|
|
ORANGEFS_I(file->f_path.dentry->d_inode);
|
|
struct orangefs_kernel_op_s *new_op = NULL;
|
|
|
|
/* required call */
|
|
filemap_write_and_wait_range(file->f_mapping, start, end);
|
|
|
|
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->f_path.dentry->d_inode));
|
|
|
|
gossip_debug(GOSSIP_FILE_DEBUG,
|
|
"orangefs_fsync got return value of %d\n",
|
|
ret);
|
|
|
|
op_release(new_op);
|
|
|
|
orangefs_flush_inode(file->f_path.dentry->d_inode);
|
|
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.
|
|
*
|
|
* 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, 0, 1);
|
|
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(filp->f_inode->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;
|
|
}
|
|
|
|
/** 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,
|
|
.release = orangefs_file_release,
|
|
.fsync = orangefs_fsync,
|
|
};
|