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xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git
The following commit(s) were added to refs/heads/master by this push:
new a4c9fdc4472 fs/mmap/fs_msync.c: don't flush changes if MAP_PRIVATE
a4c9fdc4472 is described below
commit a4c9fdc4472e13ac0c6aee8c3c301d07f71f11cc
Author: p-szafonimateusz <[email protected]>
AuthorDate: Thu Sep 25 12:57:39 2025 +0200
fs/mmap/fs_msync.c: don't flush changes if MAP_PRIVATE
changes should not be flushed to the underlying file if memory mapping is
marked as MAP_PRIVATE.
Signed-off-by: p-szafonimateusz <[email protected]>
---
fs/mmap/fs_msync.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/mmap/fs_msync.c b/fs/mmap/fs_msync.c
index 823770fe2e2..93d7f675088 100644
--- a/fs/mmap/fs_msync.c
+++ b/fs/mmap/fs_msync.c
@@ -78,13 +78,19 @@ int msync(FAR void *start, size_t length, int flags)
goto out;
}
- if (entry->msync == NULL)
+ /* Don't synchronize a file if this is private mapping or there is
+ * no msync handler for this file.
+ */
+
+ if (entry->msync && (entry->flags & MAP_PRIVATE) == 0)
+ {
+ ret = entry->msync(entry, start, length, flags);
+ }
+ else
{
ret = OK;
- goto out;
}
- ret = entry->msync(entry, start, length, flags);
out:
mm_map_unlock();
if (ret < 0)
