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gfs2: Pull return value test out of should_fault_in_pages 

Pull the return value test of the previous read or write operation out
of should_fault_in_pages().  In a following patch, we'll fault in pages
before the I/O and there will be no return value to check.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2022-05-05 12:53:26 +02:00
parent 6d22ff4710
commit 7238226450
1 changed files with 22 additions and 12 deletions
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34
fs/gfs2/file.c
View File

@ -770,7 +770,7 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
return ret ? ret : ret1;
}
static inline bool should_fault_in_pages(ssize_t ret, struct iov_iter *i,
static inline bool should_fault_in_pages(struct iov_iter *i,
size_t *prev_count,
size_t *window_size)
{
@ -779,8 +779,6 @@ static inline bool should_fault_in_pages(ssize_t ret, struct iov_iter *i,
if (likely(!count))
return false;
if (ret <= 0 && ret != -EFAULT)
return false;
if (!iter_is_iovec(i))
return false;
@ -842,10 +840,12 @@ retry_under_glock:
IOMAP_DIO_PARTIAL, read);
to->nofault = false;
pagefault_enable();
if (ret <= 0 && ret != -EFAULT)
goto out_unlock;
if (ret > 0)
read = ret;
if (should_fault_in_pages(ret, to, &prev_count, &window_size)) {
if (should_fault_in_pages(to, &prev_count, &window_size)) {
gfs2_holder_allow_demote(gh);
window_size -= fault_in_iov_iter_writeable(to, window_size);
gfs2_holder_disallow_demote(gh);
@ -855,6 +855,7 @@ retry_under_glock:
goto retry;
}
}
out_unlock:
if (gfs2_holder_queued(gh))
gfs2_glock_dq(gh);
out_uninit:
@ -899,20 +900,23 @@ retry:
goto out_uninit;
/* Silently fall back to buffered I/O when writing beyond EOF */
if (iocb->ki_pos + iov_iter_count(from) > i_size_read(&ip->i_inode))
goto out;
goto out_unlock;
retry_under_glock:
from->nofault = true;
ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL,
IOMAP_DIO_PARTIAL, written);
from->nofault = false;
if (ret == -ENOTBLK)
ret = 0;
if (ret <= 0) {
if (ret == -ENOTBLK)
ret = 0;
if (ret != -EFAULT)
goto out_unlock;
}
if (ret > 0)
written = ret;
if (should_fault_in_pages(ret, from, &prev_count, &window_size)) {
if (should_fault_in_pages(from, &prev_count, &window_size)) {
gfs2_holder_allow_demote(gh);
window_size -= fault_in_iov_iter_readable(from, window_size);
gfs2_holder_disallow_demote(gh);
@ -922,7 +926,7 @@ retry_under_glock:
goto retry;
}
}
out:
out_unlock:
if (gfs2_holder_queued(gh))
gfs2_glock_dq(gh);
out_uninit:
@ -975,10 +979,12 @@ retry_under_glock:
pagefault_disable();
ret = generic_file_read_iter(iocb, to);
pagefault_enable();
if (ret <= 0 && ret != -EFAULT)
goto out_unlock;
if (ret > 0)
read += ret;
if (should_fault_in_pages(ret, to, &prev_count, &window_size)) {
if (should_fault_in_pages(to, &prev_count, &window_size)) {
gfs2_holder_allow_demote(&gh);
window_size -= fault_in_iov_iter_writeable(to, window_size);
gfs2_holder_disallow_demote(&gh);
@ -988,6 +994,7 @@ retry_under_glock:
goto retry;
}
}
out_unlock:
if (gfs2_holder_queued(&gh))
gfs2_glock_dq(&gh);
out_uninit:
@ -1050,8 +1057,11 @@ retry_under_glock:
if (inode == sdp->sd_rindex)
gfs2_glock_dq_uninit(statfs_gh);
if (ret <= 0 && ret != -EFAULT)
goto out_unlock;
from->count = orig_count - written;
if (should_fault_in_pages(ret, from, &prev_count, &window_size)) {
if (should_fault_in_pages(from, &prev_count, &window_size)) {
gfs2_holder_allow_demote(gh);
window_size -= fault_in_iov_iter_readable(from, window_size);
gfs2_holder_disallow_demote(gh);