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fuse: support large folios for writethrough writes

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Add support for folios larger than one page size for writethrough
writes.

Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Joanne Koong 2025-05-12 15:58:33 -07:00 committed by Miklos Szeredi
parent 63c69ad3d1
commit d60a6015e1
1 changed files with 10 additions and 5 deletions
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15
fs/fuse/file.c
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@ -1146,7 +1146,8 @@ static ssize_t fuse_fill_write_pages(struct fuse_io_args *ia,
size_t tmp; size_t tmp;
struct folio *folio; struct folio *folio;
pgoff_t index = pos >> PAGE_SHIFT; pgoff_t index = pos >> PAGE_SHIFT;
unsigned bytes = min(PAGE_SIZE - offset, num); unsigned int bytes;
unsigned int folio_offset;
again: again:
folio = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN, folio = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN,
@ -1159,7 +1160,10 @@ static ssize_t fuse_fill_write_pages(struct fuse_io_args *ia,
if (mapping_writably_mapped(mapping)) if (mapping_writably_mapped(mapping))
flush_dcache_folio(folio); flush_dcache_folio(folio);
tmp = copy_folio_from_iter_atomic(folio, offset, bytes, ii); folio_offset = ((index - folio->index) << PAGE_SHIFT) + offset;
bytes = min(folio_size(folio) - folio_offset, num);
tmp = copy_folio_from_iter_atomic(folio, folio_offset, bytes, ii);
flush_dcache_folio(folio); flush_dcache_folio(folio);
if (!tmp) { if (!tmp) {
@ -1179,6 +1183,7 @@ static ssize_t fuse_fill_write_pages(struct fuse_io_args *ia,
} }
ap->folios[ap->num_folios] = folio; ap->folios[ap->num_folios] = folio;
ap->descs[ap->num_folios].offset = folio_offset;
ap->descs[ap->num_folios].length = tmp; ap->descs[ap->num_folios].length = tmp;
ap->num_folios++; ap->num_folios++;
@ -1186,11 +1191,11 @@ static ssize_t fuse_fill_write_pages(struct fuse_io_args *ia,
pos += tmp; pos += tmp;
num -= tmp; num -= tmp;
offset += tmp; offset += tmp;
if (offset == PAGE_SIZE) if (offset == folio_size(folio))
offset = 0; offset = 0;
/* If we copied full page, mark it uptodate */ /* If we copied full folio, mark it uptodate */
if (tmp == PAGE_SIZE) if (tmp == folio_size(folio))
folio_mark_uptodate(folio); folio_mark_uptodate(folio);
if (folio_test_uptodate(folio)) { if (folio_test_uptodate(folio)) {