Hi,
> -----Original Message-----
> From: Yunlei He [mailto:heyun...@huawei.com]
> Sent: Friday, December 25, 2015 4:48 PM
> To: linux-f2fs-devel@lists.sourceforge.net; jaeg...@kernel.org;
> chao2...@samsung.com
> Cc: bintian.w...@huawei.com; Yunlei He; Xue Liu
> Subject: [PATCH] f2fs: add a max block count for f2fs_map_blocks
>
> This patch adds a max block count for f2fs_map_blocks
Maximum file size should be limited by sb->s_maxbytes which was inited
in max_file_size(), so logical block index should not exceed the value
calculated with maxbytes, why would we limit logical block index with
another value?
Thanks,
>
> Signed-off-by: Yunlei He <heyun...@huawei.com>
> Signed-off-by: Xue Liu <liuxueliu....@huawei.com>
> ---
> fs/f2fs/data.c | 4 ++++
> fs/f2fs/f2fs.h | 3 +++
> 2 files changed, 7 insertions(+)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index e34b1bd..2a16c867 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -578,6 +578,10 @@ int f2fs_map_blocks(struct inode *inode, struct
> f2fs_map_blocks *map,
> map->m_len = 0;
> map->m_flags = 0;
>
> + /* We can handle the block number less than F2FS_MAX_BLOCKS */
> + if (unlikely(map->m_lblk >= F2FS_MAX_BLOCKS))
> + return -EUCLEAN;
> +
> /* it only supports block size == page size */
> pgofs = (pgoff_t)map->m_lblk;
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 19beabe..911c99b 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -331,6 +331,9 @@ enum {
>
> #define F2FS_LINK_MAX 0xffffffff /* maximum link count per file
> */
>
> +
> +#define F2FS_MAX_BLOCKS 0x3F015AFF /* maximum block count per file */
> +
> #define MAX_DIR_RA_PAGES 4 /* maximum ra pages of dir */
>
> /* vector size for gang look-up from extent cache that consists of radix
> tree */
> --
> 1.9.1
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