From: Christoph Hellwig hch@lst.de
[ Upstream commit 3ac1d426510f97ace05093ae9f2f710d9cbe6215 ]
The length variable is rather pointless given that it can be trivially deduced from offset and size. Also the initial calculation can lead to KASAN warnings.
Signed-off-by: Christoph Hellwig hch@lst.de Reported-by: Leizhen (ThunderTown) thunder.leizhen@huawei.com Reviewed-by: Darrick J. Wong djwong@kernel.org Signed-off-by: Darrick J. Wong djwong@kernel.org Reviewed-by: Matthew Wilcox (Oracle) willy@infradead.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/iomap/seek.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-)
diff --git a/fs/iomap/seek.c b/fs/iomap/seek.c index 107ee80c3568..271edcc84a28 100644 --- a/fs/iomap/seek.c +++ b/fs/iomap/seek.c @@ -186,27 +186,23 @@ loff_t iomap_seek_data(struct inode *inode, loff_t offset, const struct iomap_ops *ops) { loff_t size = i_size_read(inode); - loff_t length = size - offset; loff_t ret;
/* Nothing to be found before or beyond the end of the file. */ if (offset < 0 || offset >= size) return -ENXIO;
- while (length > 0) { - ret = iomap_apply(inode, offset, length, IOMAP_REPORT, ops, - &offset, iomap_seek_data_actor); + while (offset < size) { + ret = iomap_apply(inode, offset, size - offset, IOMAP_REPORT, + ops, &offset, iomap_seek_data_actor); if (ret < 0) return ret; if (ret == 0) - break; - + return offset; offset += ret; - length -= ret; }
- if (length <= 0) - return -ENXIO; - return offset; + /* We've reached the end of the file without finding data */ + return -ENXIO; } EXPORT_SYMBOL_GPL(iomap_seek_data);