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linux-sg2042/fs/orangefs/file.c

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// 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
*/
/*
* When reading, readahead_size will only be zero when
* we're doing O_DIRECT, otherwise we got here from
* orangefs_readpage.
*
* If we got here from orangefs_readpage we want to
* copy either a page or the whole file into the io
* vector, whichever is smaller.
*/
if (readahead_size)
copy_amount =
min(new_op->downcall.resp.io.amt_complete,
(__s64)PAGE_SIZE);
else
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) {
if ((readahead_size) && (type == ORANGEFS_IO_READ)) {
/* readpage */
*index_return = buffer_index;
gossip_debug(GOSSIP_FILE_DEBUG,
"%s: hold on to buffer_index :%d:\n",
__func__, buffer_index);
} else {
/* O_DIRECT */
orangefs_bufmap_put(buffer_index);
gossip_debug(GOSSIP_FILE_DEBUG,
"%s(%pU): PUT buffer_index %d\n",
__func__, handle, buffer_index);
}
}
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;
struct orangefs_read_options *ro;
orangefs_stats.reads++;
/*
* Remember how they set "count" in read(2) or pread(2) or whatever -
* users can use count as a knob to control orangefs io size and later
* we can try to help them fill as many pages as possible in readpage.
*/
if (!iocb->ki_filp->private_data) {
iocb->ki_filp->private_data = kmalloc(sizeof *ro, GFP_KERNEL);
if (!iocb->ki_filp->private_data)
return(ENOMEM);
ro = iocb->ki_filp->private_data;
ro->blksiz = iter->count;
}
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 int orangefs_getflags(struct inode *inode, unsigned long *uval)
{
__u64 val = 0;
int ret;
ret = orangefs_inode_getxattr(inode,
"user.pvfs2.meta_hint",
&val, sizeof(val));
if (ret < 0 && ret != -ENODATA)
return ret;
else if (ret == -ENODATA)
val = 0;
*uval = val;
return 0;
}
/*
* Perform a miscellaneous operation on a file.
*/
static long orangefs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(file);
int ret = -ENOTTY;
__u64 val = 0;
unsigned long uval;
gossip_debug(GOSSIP_FILE_DEBUG,
"orangefs_ioctl: called with cmd %d\n",
cmd);
/*
* we understand some general ioctls on files, such as the immutable
* and append flags
*/
if (cmd == FS_IOC_GETFLAGS) {
ret = orangefs_getflags(inode, &uval);
if (ret)
return ret;
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) {
unsigned long old_uval;
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;
}
ret = orangefs_getflags(inode, &old_uval);
if (ret)
return ret;
ret = vfs_ioc_setflags_prepare(inode, old_uval, uval);
if (ret)
return ret;
val = uval;
gossip_debug(GOSSIP_FILE_DEBUG,
"orangefs_ioctl: FS_IOC_SETFLAGS: %llu\n",
(unsigned long long)val);
ret = orangefs_inode_setxattr(inode,
"user.pvfs2.meta_hint",
&val, sizeof(val), 0);
}
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 %s\n",
(file ?
(char *)file->f_path.dentry->d_name.name :
(char *)"Unknown"));
/* set the sequential readahead hint */
vma->vm_flags |= VM_SEQ_READ;
vma->vm_flags &= ~VM_RAND_READ;
file_accessed(file);
vma->vm_ops = &orangefs_file_vm_ops;
return 0;
}
#define mapping_nrpages(idata) ((idata)->nrpages)
/*
* Called to notify the module that there are no more references to
* this file (i.e. no processes have it open).
*
* \note Not called when each file is closed.
*/
static int orangefs_file_release(struct inode *inode, struct file *file)
{
gossip_debug(GOSSIP_FILE_DEBUG,
"orangefs_file_release: called on %pD\n",
file);
/*
* remove all associated inode pages from the page cache and
* readahead cache (if any); this forces an expensive refresh of
* data for the next caller of mmap (or 'get_block' accesses)
*/
if (file_inode(file) &&
file_inode(file)->i_mapping &&
mapping_nrpages(&file_inode(file)->i_data)) {
if (orangefs_features & ORANGEFS_FEATURE_READAHEAD) {
gossip_debug(GOSSIP_INODE_DEBUG,
"calling flush_racache on %pU\n",
get_khandle_from_ino(inode));
flush_racache(inode);
gossip_debug(GOSSIP_INODE_DEBUG,
"flush_racache finished\n");
}
}
return 0;
}
/*
* Push all data for a specific file onto permanent storage.
*/
static int orangefs_fsync(struct file *file,
loff_t start,
loff_t end,
int datasync)
{
int ret;
struct orangefs_inode_s *orangefs_inode =
ORANGEFS_I(file_inode(file));
struct orangefs_kernel_op_s *new_op = NULL;
ret = filemap_write_and_wait_range(file_inode(file)->i_mapping,
start, end);
if (ret < 0)
return ret;
new_op = op_alloc(ORANGEFS_VFS_OP_FSYNC);
if (!new_op)
return -ENOMEM;
new_op->upcall.req.fsync.refn = orangefs_inode->refn;
ret = service_operation(new_op,
"orangefs_fsync",
get_interruptible_flag(file_inode(file)));
gossip_debug(GOSSIP_FILE_DEBUG,
"orangefs_fsync got return value of %d\n",
ret);
op_release(new_op);
return ret;
}
/*
* Change the file pointer position for an instance of an open file.
*
* \note If .llseek is overriden, we must acquire lock as described in
* Documentation/filesystems/locking.rst.
*
* Future upgrade could support SEEK_DATA and SEEK_HOLE but would
* require much changes to the FS
*/
static loff_t orangefs_file_llseek(struct file *file, loff_t offset, int origin)
{
int ret = -EINVAL;
struct inode *inode = file_inode(file);
if (origin == SEEK_END) {
/*
* revalidate the inode's file size.
* NOTE: We are only interested in file size here,
* so we set mask accordingly.
*/
ret = orangefs_inode_getattr(file->f_mapping->host,
ORANGEFS_GETATTR_SIZE);
if (ret == -ESTALE)
ret = -EIO;
if (ret) {
gossip_debug(GOSSIP_FILE_DEBUG,
"%s:%s:%d calling make bad inode\n",
__FILE__,
__func__,
__LINE__);
return ret;
}
}
gossip_debug(GOSSIP_FILE_DEBUG,
"orangefs_file_llseek: offset is %ld | origin is %d"
" | inode size is %lu\n",
(long)offset,
origin,
(unsigned long)i_size_read(inode));
return generic_file_llseek(file, offset, origin);
}
/*
* Support local locks (locks that only this kernel knows about)
* if Orangefs was mounted -o local_lock.
*/
static int orangefs_lock(struct file *filp, int cmd, struct file_lock *fl)
{
int rc = -EINVAL;
if (ORANGEFS_SB(file_inode(filp)->i_sb)->flags & ORANGEFS_OPT_LOCAL_LOCK) {
if (cmd == F_GETLK) {
rc = 0;
posix_test_lock(filp, fl);
} else {
rc = posix_lock_file(filp, fl, NULL);
}
}
return rc;
}
static int orangefs_file_open(struct inode * inode, struct file *file)
{
file->private_data = NULL;
return generic_file_open(inode, file);
}
static int orangefs_flush(struct file *file, fl_owner_t id)
{
/*
* This is vfs_fsync_range(file, 0, LLONG_MAX, 0) without the
* service_operation in orangefs_fsync.
*
* Do not send fsync to OrangeFS server on a close. Do send fsync
* on an explicit fsync call. This duplicates historical OrangeFS
* behavior.
*/
struct inode *inode = file->f_mapping->host;
int r;
kfree(file->private_data);
file->private_data = NULL;
if (inode->i_state & I_DIRTY_TIME) {
spin_lock(&inode->i_lock);
inode->i_state &= ~I_DIRTY_TIME;
spin_unlock(&inode->i_lock);
mark_inode_dirty_sync(inode);
}
r = filemap_write_and_wait_range(file->f_mapping, 0, LLONG_MAX);
if (r > 0)
return 0;
else
return r;
}
/** ORANGEFS implementation of VFS file operations */
const struct file_operations orangefs_file_operations = {
.llseek = orangefs_file_llseek,
.read_iter = orangefs_file_read_iter,
.write_iter = orangefs_file_write_iter,
.lock = orangefs_lock,
.unlocked_ioctl = orangefs_ioctl,
.mmap = orangefs_file_mmap,
.open = orangefs_file_open,
.flush = orangefs_flush,
.release = orangefs_file_release,
.fsync = orangefs_fsync,
};
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