bcachefs: Split up fs-io.[ch]

fs-io.c is too big - time for some reorganization
 - fs-dio.c: direct io
 - fs-pagecache.c: pagecache data structures (bch_folio), utility code

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 148 insertions, 18 deletions

diff --git a/fs/bcachefs/fs-io.h b/fs/bcachefs/fs-io.h
index af905331542d..bb5b709fa8cf 100644
--- a/fs/bcachefs/fs-io.h
+++ b/fs/bcachefs/fs-io.h
@@ -5,28 +5,163 @@
 #ifndef NO_BCACHEFS_FS
 
 #include "buckets.h"
+#include "fs.h"
 #include "io_types.h"
+#include "quota.h"
 
 #include <linux/uio.h>
 
-struct quota_res;
+struct folio_vec {
+	struct folio	*fv_folio;
+	size_t		fv_offset;
+	size_t		fv_len;
+};
+
+static inline struct folio_vec biovec_to_foliovec(struct bio_vec bv)
+{
+
+	struct folio *folio	= page_folio(bv.bv_page);
+	size_t offset		= (folio_page_idx(folio, bv.bv_page) << PAGE_SHIFT) +
+		bv.bv_offset;
+	size_t len = min_t(size_t, folio_size(folio) - offset, bv.bv_len);
+
+	return (struct folio_vec) {
+		.fv_folio	= folio,
+		.fv_offset	= offset,
+		.fv_len		= len,
+	};
+}
+
+static inline struct folio_vec bio_iter_iovec_folio(struct bio *bio,
+						    struct bvec_iter iter)
+{
+	return biovec_to_foliovec(bio_iter_iovec(bio, iter));
+}
+
+#define __bio_for_each_folio(bvl, bio, iter, start)			\
+	for (iter = (start);						\
+	     (iter).bi_size &&						\
+		((bvl = bio_iter_iovec_folio((bio), (iter))), 1);	\
+	     bio_advance_iter_single((bio), &(iter), (bvl).fv_len))
+
+/**
+ * bio_for_each_folio - iterate over folios within a bio
+ *
+ * Like other non-_all versions, this iterates over what bio->bi_iter currently
+ * points to. This version is for drivers, where the bio may have previously
+ * been split or cloned.
+ */
+#define bio_for_each_folio(bvl, bio, iter)				\
+	__bio_for_each_folio(bvl, bio, iter, (bio)->bi_iter)
+
+struct quota_res {
+	u64				sectors;
+};
+
+#ifdef CONFIG_BCACHEFS_QUOTA
+
+static inline void __bch2_quota_reservation_put(struct bch_fs *c,
+					 struct bch_inode_info *inode,
+					 struct quota_res *res)
+{
+	BUG_ON(res->sectors > inode->ei_quota_reserved);
+
+	bch2_quota_acct(c, inode->ei_qid, Q_SPC,
+			-((s64) res->sectors), KEY_TYPE_QUOTA_PREALLOC);
+	inode->ei_quota_reserved -= res->sectors;
+	res->sectors = 0;
+}
+
+static inline void bch2_quota_reservation_put(struct bch_fs *c,
+				       struct bch_inode_info *inode,
+				       struct quota_res *res)
+{
+	if (res->sectors) {
+		mutex_lock(&inode->ei_quota_lock);
+		__bch2_quota_reservation_put(c, inode, res);
+		mutex_unlock(&inode->ei_quota_lock);
+	}
+}
+
+static inline int bch2_quota_reservation_add(struct bch_fs *c,
+				      struct bch_inode_info *inode,
+				      struct quota_res *res,
+				      u64 sectors,
+				      bool check_enospc)
+{
+	int ret;
+
+	if (test_bit(EI_INODE_SNAPSHOT, &inode->ei_flags))
+		return 0;
+
+	mutex_lock(&inode->ei_quota_lock);
+	ret = bch2_quota_acct(c, inode->ei_qid, Q_SPC, sectors,
+			      check_enospc ? KEY_TYPE_QUOTA_PREALLOC : KEY_TYPE_QUOTA_NOCHECK);
+	if (likely(!ret)) {
+		inode->ei_quota_reserved += sectors;
+		res->sectors += sectors;
+	}
+	mutex_unlock(&inode->ei_quota_lock);
+
+	return ret;
+}
 
-int __must_check bch2_write_inode_size(struct bch_fs *,
-				       struct bch_inode_info *,
-				       loff_t, unsigned);
+#else
+
+static inline void __bch2_quota_reservation_put(struct bch_fs *c,
+					 struct bch_inode_info *inode,
+					 struct quota_res *res) {}
 
-int bch2_read_folio(struct file *, struct folio *);
+static inline void bch2_quota_reservation_put(struct bch_fs *c,
+				       struct bch_inode_info *inode,
+				       struct quota_res *res) {}
 
-int bch2_writepages(struct address_space *, struct writeback_control *);
-void bch2_readahead(struct readahead_control *);
+static inline int bch2_quota_reservation_add(struct bch_fs *c,
+				      struct bch_inode_info *inode,
+				      struct quota_res *res,
+				      unsigned sectors,
+				      bool check_enospc)
+{
+	return 0;
+}
 
-int bch2_write_begin(struct file *, struct address_space *, loff_t,
-		     unsigned, struct page **, void **);
-int bch2_write_end(struct file *, struct address_space *, loff_t,
-		   unsigned, unsigned, struct page *, void *);
+#endif
 
-ssize_t bch2_read_iter(struct kiocb *, struct iov_iter *);
-ssize_t bch2_write_iter(struct kiocb *, struct iov_iter *);
+void __bch2_i_sectors_acct(struct bch_fs *, struct bch_inode_info *,
+			   struct quota_res *, s64);
+
+static inline void bch2_i_sectors_acct(struct bch_fs *c, struct bch_inode_info *inode,
+				       struct quota_res *quota_res, s64 sectors)
+{
+	if (sectors) {
+		mutex_lock(&inode->ei_quota_lock);
+		__bch2_i_sectors_acct(c, inode, quota_res, sectors);
+		mutex_unlock(&inode->ei_quota_lock);
+	}
+}
+
+static inline struct address_space *faults_disabled_mapping(void)
+{
+	return (void *) (((unsigned long) current->faults_disabled_mapping) & ~1UL);
+}
+
+static inline void set_fdm_dropped_locks(void)
+{
+	current->faults_disabled_mapping =
+		(void *) (((unsigned long) current->faults_disabled_mapping)|1);
+}
+
+static inline bool fdm_dropped_locks(void)
+{
+	return ((unsigned long) current->faults_disabled_mapping) & 1;
+}
+
+void bch2_inode_flush_nocow_writes_async(struct bch_fs *,
+			struct bch_inode_info *, struct closure *);
+
+int __must_check bch2_write_inode_size(struct bch_fs *,
+				       struct bch_inode_info *,
+				       loff_t, unsigned);
 
 int bch2_fsync(struct file *, loff_t, loff_t, int);
 
@@ -39,11 +174,6 @@ loff_t bch2_remap_file_range(struct file *, loff_t, struct file *,
 
 loff_t bch2_llseek(struct file *, loff_t, int);
 
-vm_fault_t bch2_page_fault(struct vm_fault *);
-vm_fault_t bch2_page_mkwrite(struct vm_fault *);
-void bch2_invalidate_folio(struct folio *, size_t, size_t);
-bool bch2_release_folio(struct folio *, gfp_t);
-
 void bch2_fs_fsio_exit(struct bch_fs *);
 int bch2_fs_fsio_init(struct bch_fs *);
 #else