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fuse: refactor fuse_fill_write_pages()

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Refactor the logic in fuse_fill_write_pages() for copying out write
data. This will make the future change for supporting large folios for
writes easier. No functional changes.

Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Bernd Schubert <bschubert@ddn.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Joanne Koong 2025-05-12 15:58:32 -07:00 committed by Miklos Szeredi
parent 3568a95693
commit 63c69ad3d1
1 changed files with 10 additions and 12 deletions
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22
fs/fuse/file.c
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@ -1132,21 +1132,21 @@ static ssize_t fuse_fill_write_pages(struct fuse_io_args *ia,
struct fuse_args_pages *ap = &ia->ap;
struct fuse_conn *fc = get_fuse_conn(mapping->host);
unsigned offset = pos & (PAGE_SIZE - 1);
unsigned int nr_pages = 0;
size_t count = 0;
int err;
unsigned int num;
int err = 0;
num = min(iov_iter_count(ii), fc->max_write);
num = min(num, max_pages << PAGE_SHIFT);
ap->args.in_pages = true;
ap->descs[0].offset = offset;
do {
while (num) {
size_t tmp;
struct folio *folio;
pgoff_t index = pos >> PAGE_SHIFT;
size_t bytes = min_t(size_t, PAGE_SIZE - offset,
iov_iter_count(ii));
bytes = min_t(size_t, bytes, fc->max_write - count);
unsigned bytes = min(PAGE_SIZE - offset, num);
again:
folio = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN,
@ -1178,14 +1178,13 @@ static ssize_t fuse_fill_write_pages(struct fuse_io_args *ia,
goto again;
}
err = 0;
ap->folios[ap->num_folios] = folio;
ap->descs[ap->num_folios].length = tmp;
ap->num_folios++;
nr_pages++;
count += tmp;
pos += tmp;
num -= tmp;
offset += tmp;
if (offset == PAGE_SIZE)
offset = 0;
@ -1200,10 +1199,9 @@ static ssize_t fuse_fill_write_pages(struct fuse_io_args *ia,
ia->write.folio_locked = true;
break;
}
if (!fc->big_writes)
if (!fc->big_writes || offset != 0)
break;
} while (iov_iter_count(ii) && count < fc->max_write &&
nr_pages < max_pages && offset == 0);
}
return count > 0 ? count : err;
}