diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/inode.c | 6 | ||||
| -rw-r--r-- | fs/btrfs/volumes.h | 7 |
2 files changed, 12 insertions, 1 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index d535ed39c391..03771f09a9a2 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7578,8 +7578,12 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start, const u64 data_alloc_len = length; bool unlock_extents = false; + /* + * Cap the size of reads to that usually seen in buffered I/O as we need + * to allocate a contiguous array for the checksums. + */ if (!write) - len = min_t(u64, len, fs_info->sectorsize); + len = min_t(u64, len, fs_info->sectorsize * BTRFS_MAX_BIO_SECTORS); lockstart = start; lockend = start + len - 1; diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index b61508723d5d..9537d82bb7a2 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -355,6 +355,13 @@ struct btrfs_fs_devices { / sizeof(struct btrfs_stripe) + 1) /* + * Maximum number of sectors for a single bio to limit the size of the + * checksum array. This matches the number of bio_vecs per bio and thus the + * I/O size for buffered I/O. + */ +#define BTRFS_MAX_BIO_SECTORS (256) + +/* * Additional info to pass along bio. * * Mostly for btrfs specific features like csum and mirror_num. |