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-rw-r--r--mm/shmem.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index c1d8b8a1aa3b..82911fefc2d5 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -948,6 +948,15 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
index++;
}
+ /*
+ * When undoing a failed fallocate, we want none of the partial folio
+ * zeroing and splitting below, but shall want to truncate the whole
+ * folio when !uptodate indicates that it was added by this fallocate,
+ * even when [lstart, lend] covers only a part of the folio.
+ */
+ if (unfalloc)
+ goto whole_folios;
+
same_folio = (lstart >> PAGE_SHIFT) == (lend >> PAGE_SHIFT);
folio = shmem_get_partial_folio(inode, lstart >> PAGE_SHIFT);
if (folio) {
@@ -973,6 +982,8 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
folio_put(folio);
}
+whole_folios:
+
index = start;
while (index < end) {
cond_resched();