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| author | Yuezhang Mo <Yuezhang.Mo@sony.com> | 2023-05-30 12:35:00 +0300 |
|---|---|---|
| committer | Namjae Jeon <linkinjeon@kernel.org> | 2024-01-08 15:57:22 +0300 |
| commit | f55c096f62f100aa9f5f48d86e1b6846ecbd67e7 (patch) | |
| tree | d5dce12faa25ab245312c8741e391d9c6e3e0aa0 /fs/exfat/inode.c | |
| parent | 11a347fb6cef62ce47e84b97c45f2b2497c7593b (diff) | |
| download | linux-f55c096f62f100aa9f5f48d86e1b6846ecbd67e7.tar.xz | |
exfat: do not zero the extended part
Since the read operation beyond the ValidDataLength returns zero,
if we just extend the size of the file, we don't need to zero the
extended part, but only change the DataLength without changing
the ValidDataLength.
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Reviewed-by: Andy Wu <Andy.Wu@sony.com>
Reviewed-by: Aoyama Wataru <wataru.aoyama@sony.com>
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Diffstat (limited to 'fs/exfat/inode.c')
| -rw-r--r-- | fs/exfat/inode.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c index b02677c9fd45..522edcbb2ce4 100644 --- a/fs/exfat/inode.c +++ b/fs/exfat/inode.c @@ -75,8 +75,17 @@ int __exfat_write_inode(struct inode *inode, int sync) if (ei->start_clu == EXFAT_EOF_CLUSTER) on_disk_size = 0; - ep2->dentry.stream.valid_size = cpu_to_le64(ei->valid_size); ep2->dentry.stream.size = cpu_to_le64(on_disk_size); + /* + * mmap write does not use exfat_write_end(), valid_size may be + * extended to the sector-aligned length in exfat_get_block(). + * So we need to fixup valid_size to the writren length. + */ + if (on_disk_size < ei->valid_size) + ep2->dentry.stream.valid_size = ep2->dentry.stream.size; + else + ep2->dentry.stream.valid_size = cpu_to_le64(ei->valid_size); + if (on_disk_size) { ep2->dentry.stream.flags = ei->flags; ep2->dentry.stream.start_clu = cpu_to_le32(ei->start_clu); @@ -340,6 +349,9 @@ static int exfat_get_block(struct inode *inode, sector_t iblock, pos, ei->i_size_aligned); goto unlock_ret; } + + ei->valid_size = EXFAT_BLK_TO_B(iblock + max_blocks, sb); + mark_inode_dirty(inode); } else { valid_blks = EXFAT_B_TO_BLK(ei->valid_size, sb); |