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orangefs: get rid of handle_io_error()

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the second caller never needs to cancel, actually

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Al Viro 2016-02-11 21:28:52 -05:00 committed by Mike Marshall
parent 7b9761af86
commit c0eae8cd77
1 changed files with 14 additions and 51 deletions
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65
fs/orangefs/file.c
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@ -82,46 +82,6 @@ static int postcopy_buffers(struct orangefs_bufmap *bufmap,
return ret;
}
/*
* handles two possible error cases, depending on context.
*
* by design, our vfs i/o errors need to be handled in one of two ways,
* depending on where the error occured.
*
* if the error happens in the waitqueue code because we either timed
* out or a signal was raised while waiting, we need to cancel the
* userspace i/o operation and free the op manually. this is done to
* avoid having the device start writing application data to our shared
* bufmap pages without us expecting it.
*
* FIXME: POSSIBLE OPTIMIZATION:
* However, if we timed out or if we got a signal AND our upcall was never
* picked off the queue (i.e. we were in OP_VFS_STATE_WAITING), then we don't
* need to send a cancellation upcall. The way we can handle this is
* set error_exit to 2 in such cases and 1 whenever cancellation has to be
* sent and have handle_error
* take care of this situation as well..
*
* if a orangefs sysint level error occured and i/o has been completed,
* there is no need to cancel the operation, as the user has finished
* using the bufmap page and so there is no danger in this case. in
* this case, we wake up the device normally so that it may free the
* op, as normal.
*
* note the only reason this is a macro is because both read and write
* cases need the exact same handling code.
*/
#define handle_io_error() \
do { \
if (!op_state_serviced(new_op)) { \
orangefs_cancel_op_in_progress(new_op->tag); \
} else { \
complete(&new_op->done); \
} \
orangefs_bufmap_put(bufmap, buffer_index); \
buffer_index = -1; \
} while (0)
/*
* Post and wait for the I/O upcall to finish
*/
@ -221,7 +181,17 @@ static ssize_t wait_for_direct_io(enum ORANGEFS_io_type type, struct inode *inod
}
if (ret < 0) {
handle_io_error();
/*
* XXX: needs to be optimized - we only need to cancel if it
* had been seen by daemon and not completed
*/
if (!op_state_serviced(new_op)) {
orangefs_cancel_op_in_progress(new_op->tag);
} else {
complete(&new_op->done);
}
orangefs_bufmap_put(bufmap, buffer_index);
buffer_index = -1;
/*
* don't write an error to syslog on signaled operation
* termination unless we've got debugging turned on, as
@ -249,16 +219,8 @@ static ssize_t wait_for_direct_io(enum ORANGEFS_io_type type, struct inode *inod
buffer_index,
iter,
new_op->downcall.resp.io.amt_complete);
if (ret < 0) {
/*
* put error codes in downcall so that handle_io_error()
* preserves it properly
*/
WARN_ON(!op_state_serviced(new_op));
new_op->downcall.status = ret;
handle_io_error();
goto out;
}
if (ret < 0)
goto done_copying;
}
gossip_debug(GOSSIP_FILE_DEBUG,
"%s(%pU): Amount written as returned by the sys-io call:%d\n",
@ -268,6 +230,7 @@ static ssize_t wait_for_direct_io(enum ORANGEFS_io_type type, struct inode *inod
ret = new_op->downcall.resp.io.amt_complete;
done_copying:
/*
* tell the device file owner waiting on I/O that this read has
* completed and it can return now.