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ceph: add new field max_file_size in ceph_fs_client

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In order to not bother to VFS and other specific filesystems,
we decided to do offset validation inside ceph kernel client,
so just simply set sb->s_maxbytes to MAX_LFS_FILESIZE so that
it can successfully pass VFS check. We add new field max_file_size
in ceph_fs_client to store real file size limit and doing proper
check based on it.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Chengguang Xu 2018-07-19 22:15:24 +08:00 committed by Ilya Dryomov
parent f1d10e0463
commit 719784ba70
3 changed files with 5 additions and 2 deletions
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3
fs/ceph/mds_client.c
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@ -4018,7 +4018,8 @@ void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
} else {
mdsc->mdsmap = newmap; /* first mds map */
}
mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
MAX_LFS_FILESIZE);
__wake_requests(mdsc, &mdsc->waiting_for_map);
ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,

3
fs/ceph/super.c
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@ -940,11 +940,12 @@ static int ceph_set_super(struct super_block *s, void *data)
dout("set_super %p data %p\n", s, data);
s->s_flags = fsc->mount_options->sb_flags;
s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
s->s_maxbytes = MAX_LFS_FILESIZE;
s->s_xattr = ceph_xattr_handlers;
s->s_fs_info = fsc;
fsc->sb = s;
fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
s->s_op = &ceph_super_ops;
s->s_d_op = &ceph_dentry_ops;

1
fs/ceph/super.h
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@ -98,6 +98,7 @@ struct ceph_fs_client {
unsigned long mount_state;
int min_caps; /* min caps i added */
loff_t max_file_size;
struct ceph_mds_client *mdsc;