ext4: add pre-content fsnotify hook for DAX faults

jankara · jankara · commit bb480760ffc7 · 2024-12-11T17:28:41.000+01:00
ext4 has its own handling for DAX faults. Add the pre-content fsnotify
hook for this case.

Signed-off-by: Jan Kara &lt;jack@suse.cz&gt;
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
@@ -756,6 +756,9 @@ static vm_fault_t ext4_dax_huge_fault(struct vm_fault *vmf, unsigned int order)
 			return VM_FAULT_SIGBUS;
 		}
 	} else {
+		result = filemap_fsnotify_fault(vmf);
+		if (unlikely(result))
+			return result;
 		filemap_invalidate_lock_shared(mapping);
 	}
 	result = dax_iomap_fault(vmf, order, &pfn, &error, &ext4_iomap_ops);

Original file line number	Diff line number	Diff line change
`@@ -756,6 +756,9 @@ static vm_fault_t ext4_dax_huge_fault(struct vm_fault *vmf, unsigned int order)`
`756`	`756`	`return VM_FAULT_SIGBUS;`
`757`	`757`	`}`
`758`	`758`	`} else {`
	`759`	`+ result = filemap_fsnotify_fault(vmf);`
	`760`	`+ if (unlikely(result))`
	`761`	`+ return result;`
`759`	`762`	`filemap_invalidate_lock_shared(mapping);`
`760`	`763`	`}`
`761`	`764`	`result = dax_iomap_fault(vmf, order, &pfn, &error, &ext4_iomap_ops);`