Commit 95cca2b4 authored by Yan, Zheng's avatar Yan, Zheng Committed by Ilya Dryomov

ceph: limit osd write size

OSD has a configurable limitation of max write size. OSD return
error if write request size is larger than the limitation. For now,
set max write size to CEPH_MSG_MAX_DATA_LEN. It should be small
enough.
Signed-off-by: default avatar"Yan, Zheng" <zyan@redhat.com>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent aa187926
......@@ -779,10 +779,8 @@ static int ceph_writepages_start(struct address_space *mapping,
mapping_set_error(mapping, -EIO);
return -EIO; /* we're in a forced umount, don't write! */
}
if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize)
if (fsc->mount_options->wsize < wsize)
wsize = fsc->mount_options->wsize;
if (wsize < PAGE_SIZE)
wsize = PAGE_SIZE;
max_pages_ever = wsize >> PAGE_SHIFT;
pagevec_init(&pvec, 0);
......
......@@ -887,7 +887,9 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
break;
}
if (!write)
if (write)
size = min_t(u64, size, fsc->mount_options->wsize);
else
size = min_t(u64, size, fsc->mount_options->rsize);
len = size;
......
......@@ -233,7 +233,9 @@ static int parse_fsopt_token(char *c, void *private)
break;
/* misc */
case Opt_wsize:
fsopt->wsize = intval;
if (intval < PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
return -EINVAL;
fsopt->wsize = ALIGN(intval, PAGE_SIZE);
break;
case Opt_rsize:
if (intval < PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
......@@ -392,6 +394,7 @@ static int parse_mount_options(struct ceph_mount_options **pfsopt,
fsopt->sb_flags = flags;
fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
fsopt->wsize = CEPH_MAX_WRITE_SIZE;
fsopt->rsize = CEPH_MAX_READ_SIZE;
fsopt->rasize = CEPH_RASIZE_DEFAULT;
fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
......
......@@ -48,6 +48,9 @@
/* max size of osd read request, limited by libceph */
#define CEPH_MAX_READ_SIZE CEPH_MSG_MAX_DATA_LEN
/* osd has a configurable limitaion of max write size.
* CEPH_MSG_MAX_DATA_LEN should be small enough. */
#define CEPH_MAX_WRITE_SIZE CEPH_MSG_MAX_DATA_LEN
#define CEPH_RASIZE_DEFAULT (8192*1024) /* max readahead */
#define CEPH_MAX_READDIR_DEFAULT 1024
#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
......
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