Fix RHEL10 to be semantically identical to Ubuntu HWE 6.17

fs/fuse/dir.c

@@ -800,15 +800,7 @@ static int fuse_create_open(struct mnt_idmap *idmap, struct inode *dir,
 						get_fuse_inode(inode));
 			truncate_pagecache(inode, 0);
 		} else if (!(ff->open_flags & FOPEN_KEEP_CACHE)) {
-			/*
-			 * Only when the drop really emptied the mapping, as
-			 * in fuse_open(): a folio that survived still needs
-			 * its record.
-			 */
-			if (fuse_open_drop_cache(inode) &&
-			    fm->fc->dlm && fm->fc->writeback_cache)
-				fuse_dlm_ranges_dropped(get_fuse_inode(inode),
-							0, U64_MAX);
+			fuse_open_drop_cache(inode);
 		}
 	}
 	return err;
@@ -2213,6 +2205,7 @@ int fuse_do_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 		i_size_write(inode, outarg.attr.size);
 
 	if (is_truncate) {
+		fuse_writeback_crop_truncated(inode, outarg.attr.size);
 		/* NOTE: this may release/reacquire fi->lock */
 		__fuse_release_nowrite(inode);
 	}
@@ -2235,32 +2228,6 @@ int fuse_do_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 
 		truncate_pagecache(inode, outarg.attr.size);
 		invalidate_inode_pages2(mapping);
-
-		/*
-		 * The cache above the new size is gone, so the ranges
-		 * describing it have nothing left to say.  From the first
-		 * whole page above it: the page holding the new end of the
-		 * file survives the truncate, and so does its record.
-		 */
-		if (fc->dlm && fc->writeback_cache)
-			fuse_dlm_ranges_dropped(fi, PAGE_ALIGN(outarg.attr.size),
-						U64_MAX);
-
-		/*
-		 * invalidate_inode_pages2() emptied the mapping below the new
-		 * size too (laundering anything dirty first, so those bytes
-		 * are on the server).  A revoked range is kept only to make
-		 * writeback take the grant again before sending the folios
-		 * under it, so with those folios gone it describes nothing
-		 * and would sit in the tree unfreed, keeping its neighbours
-		 * from merging.  Only when the drop really emptied it: a busy
-		 * folio that survived still needs its record, and a fault
-		 * populating after the check keeps its page visible to it.
-		 */
-		if (fc->dlm && fc->writeback_cache && outarg.attr.size &&
-		    !filemap_range_has_page(mapping, 0, outarg.attr.size - 1))
-			fuse_dlm_ranges_dropped(fi, 0,
-						PAGE_ALIGN(outarg.attr.size) - 1);
 	}
 
 	clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);