Merge tag 'vfs-7.0-rc6.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs fixes from Christian Brauner:

 - Fix netfs_limit_iter() hitting BUG() when an ITER_KVEC iterator
   reaches it via core dump writes to 9P filesystems. Add ITER_KVEC
   handling following the same pattern as the existing ITER_BVEC code.

 - Fix a NULL pointer dereference in the netfs unbuffered write retry
   path when the filesystem (e.g., 9P) doesn't set the prepare_write
   operation.

 - Clear I_DIRTY_TIME in sync_lazytime for filesystems implementing
  ->sync_lazytime. Without this the flag stays set and may cause
   additional unnecessary calls during inode deactivation.

 - Increase tmpfs size in mount_setattr selftests. A recent commit
   bumped the ext4 image size to 2 GB but didn't adjust the tmpfs
   backing store, so mkfs.ext4 fails with ENOSPC writing metadata.

 - Fix an invalid folio access in iomap when i_blkbits matches the folio
   size but differs from the I/O granularity. The cur_folio pointer
   would not get invalidated and iomap_read_end() would still be called
   on it despite the IO helper owning it.

 - Fix hash_name() docstring.

 - Fix read abandonment during netfs retry where the subreq variable
   used for abandonment could be uninitialized on the first pass or
   point to a deleted subrequest on later passes.

 - Don't block sync for filesystems with no data integrity guarantees.
   Add a SB_I_NO_DATA_INTEGRITY superblock flag replacing the per-inode
   AS_NO_DATA_INTEGRITY mapping flag so sync kicks off writeback but
   doesn't wait for flusher threads. This fixes a suspend-to-RAM hang on
   fuse-overlayfs where the flusher thread blocks when the fuse daemon
   is frozen.

 - Fix a lockdep splat in iomap when reads fail. iomap_read_end_io()
   invokes fserror_report() which calls igrab() taking i_lock in hardirq
   context while i_lock is normally held with interrupts enabled. Kick
   failed read handling to a workqueue.

 - Remove the redundant netfs_io_stream::front member and use
   stream->subrequests.next instead, fixing a potential issue in the
   direct write code path.

* tag 'vfs-7.0-rc6.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  netfs: Fix the handling of stream->front by removing it
  iomap: fix lockdep complaint when reads fail
  writeback: don't block sync for filesystems with no data integrity guarantees
  netfs: Fix read abandonment during retry
  vfs: fix docstring of hash_name()
  iomap: fix invalid folio access when i_blkbits differs from I/O granularity
  selftests/mount_setattr: increase tmpfs size for idmapped mount tests
  fs: clear I_DIRTY_TIME in sync_lazytime
  netfs: Fix NULL pointer dereference in netfs_unbuffered_write() on retry
  netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators

4 files changed, 5 insertions, 16 deletions

diff --git a/include/linux/fs/super_types.h b/include/linux/fs/super_types.h
index fa7638b81246..383050e7fdf5 100644
--- a/include/linux/fs/super_types.h
+++ b/include/linux/fs/super_types.h
@@ -338,5 +338,6 @@ struct super_block {
 #define SB_I_NOUMASK	0x00001000	/* VFS does not apply umask */
 #define SB_I_NOIDMAP	0x00002000	/* No idmapped mounts on this superblock */
 #define SB_I_ALLOW_HSM	0x00004000	/* Allow HSM events on this superblock */
+#define SB_I_NO_DATA_INTEGRITY	0x00008000 /* fs cannot guarantee data persistence on sync */
 
 #endif /* _LINUX_FS_SUPER_TYPES_H */
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 72ee7d210a74..ba17ac5bf356 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -140,7 +140,6 @@ struct netfs_io_stream {
 	void (*issue_write)(struct netfs_io_subrequest *subreq);
 	/* Collection tracking */
 	struct list_head	subrequests;	/* Contributory I/O operations */
-	struct netfs_io_subrequest *front;	/* Op being collected */
 	unsigned long long	collected_to;	/* Position we've collected results to */
 	size_t			transferred;	/* The amount transferred from this stream */
 	unsigned short		error;		/* Aggregate error for the stream */
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index ec442af3f886..31a848485ad9 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -210,7 +210,6 @@ enum mapping_flags {
 	AS_WRITEBACK_MAY_DEADLOCK_ON_RECLAIM = 9,
 	AS_KERNEL_FILE = 10,	/* mapping for a fake kernel file that shouldn't
 				   account usage to user cgroups */
-	AS_NO_DATA_INTEGRITY = 11, /* no data integrity guarantees */
 	/* Bits 16-25 are used for FOLIO_ORDER */
 	AS_FOLIO_ORDER_BITS = 5,
 	AS_FOLIO_ORDER_MIN = 16,
@@ -346,16 +345,6 @@ static inline bool mapping_writeback_may_deadlock_on_reclaim(const struct addres
 	return test_bit(AS_WRITEBACK_MAY_DEADLOCK_ON_RECLAIM, &mapping->flags);
 }
 
-static inline void mapping_set_no_data_integrity(struct address_space *mapping)
-{
-	set_bit(AS_NO_DATA_INTEGRITY, &mapping->flags);
-}
-
-static inline bool mapping_no_data_integrity(const struct address_space *mapping)
-{
-	return test_bit(AS_NO_DATA_INTEGRITY, &mapping->flags);
-}
-
 static inline gfp_t mapping_gfp_mask(const struct address_space *mapping)
 {
 	return mapping->gfp_mask;
diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h
index 2d366be46a1c..cbe28211106c 100644
--- a/include/trace/events/netfs.h
+++ b/include/trace/events/netfs.h
@@ -740,19 +740,19 @@ TRACE_EVENT(netfs_collect_stream,
 		    __field(unsigned int,	wreq)
 		    __field(unsigned char,	stream)
 		    __field(unsigned long long,	collected_to)
-		    __field(unsigned long long,	front)
+		    __field(unsigned long long,	issued_to)
 			     ),
 
 	    TP_fast_assign(
 		    __entry->wreq	= wreq->debug_id;
 		    __entry->stream	= stream->stream_nr;
 		    __entry->collected_to = stream->collected_to;
-		    __entry->front	= stream->front ? stream->front->start : UINT_MAX;
+		    __entry->issued_to	= atomic64_read(&wreq->issued_to);
 			   ),
 
-	    TP_printk("R=%08x[%x:] cto=%llx frn=%llx",
+	    TP_printk("R=%08x[%x:] cto=%llx ito=%llx",
 		      __entry->wreq, __entry->stream,
-		      __entry->collected_to, __entry->front)
+		      __entry->collected_to, __entry->issued_to)
 	    );
 
 TRACE_EVENT(netfs_folioq,