* [f2fs-dev] [PATCH v2] f2fs: fix to use per-inode maxbytes in f2fs_fiemap
@ 2021-03-09 5:09 Chengguang Xu
0 siblings, 0 replies; only message in thread
From: Chengguang Xu @ 2021-03-09 5:09 UTC (permalink / raw)
To: jaegeuk, chao; +Cc: Chengguang Xu, linux-f2fs-devel
F2FS inode may have different max size,
so change to use per-inode maxbytes.
Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
---
v1->v2:
- Calculate max bytes in inode lock.
fs/f2fs/data.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 7c95818639a6..3cbcde4174e6 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1850,6 +1850,15 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
inode_lock(inode);
+ maxbytes = max_file_blocks(inode) << F2FS_BLKSIZE_BITS;
+ if (start > maxbytes) {
+ ret = -EFBIG;
+ goto out;
+ }
+
+ if (len > maxbytes || (maxbytes - len) < start)
+ len = maxbytes - start;
+
if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
ret = f2fs_xattr_fiemap(inode, fieinfo);
goto out;
--
2.27.0
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