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ceph: new mount option to disable usage of copy-from op

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Add a new mount option 'nocopyfrom' that will prevent the usage of the
RADOS 'copy-from' operation in cephfs.  This could be useful, for example,
for an administrator to temporarily mitigate any possible bugs in the
'copy-from' implementation.

Currently, only copy_file_range uses this RADOS operation.  Setting this
mount option will result in this syscall reverting to the default VFS
implementation, i.e. to perform the copies locally instead of doing remote
object copies.

Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Luis Henriques 2018-10-15 16:46:00 +01:00 committed by Ilya Dryomov
parent 503f82a993
commit ea4cdc548e
4 changed files with 22 additions and 0 deletions
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5
Documentation/filesystems/ceph.txt
View File

@ -151,6 +151,11 @@ Mount Options
Report overall filesystem usage in statfs instead of using the root
directory quota.
nocopyfrom
Don't use the RADOS 'copy-from' operation to perform remote object
copies. Currently, it's only used in copy_file_range, which will revert
to the default VFS implementation if this option is used.
More Information
================

3
fs/ceph/file.c
View File

@ -1917,6 +1917,9 @@ static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
* efficient).
*/
if (ceph_test_mount_opt(ceph_inode_to_client(src_inode), NOCOPYFROM))
return -EOPNOTSUPP;
if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
(src_ci->i_layout.stripe_count != dst_ci->i_layout.stripe_count) ||
(src_ci->i_layout.object_size != dst_ci->i_layout.object_size))

13
fs/ceph/super.c
View File

@ -165,6 +165,8 @@ enum {
Opt_noacl,
Opt_quotadf,
Opt_noquotadf,
Opt_copyfrom,
Opt_nocopyfrom,
};
static match_table_t fsopt_tokens = {
@ -203,6 +205,8 @@ static match_table_t fsopt_tokens = {
{Opt_noacl, "noacl"},
{Opt_quotadf, "quotadf"},
{Opt_noquotadf, "noquotadf"},
{Opt_copyfrom, "copyfrom"},
{Opt_nocopyfrom, "nocopyfrom"},
{-1, NULL}
};
@ -355,6 +359,12 @@ static int parse_fsopt_token(char *c, void *private)
case Opt_noquotadf:
fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
break;
case Opt_copyfrom:
fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
break;
case Opt_nocopyfrom:
fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
break;
#ifdef CONFIG_CEPH_FS_POSIX_ACL
case Opt_acl:
fsopt->sb_flags |= SB_POSIXACL;
@ -553,6 +563,9 @@ static int ceph_show_options(struct seq_file *m, struct dentry *root)
seq_puts(m, ",noacl");
#endif
if (fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM)
seq_puts(m, ",nocopyfrom");
if (fsopt->mds_namespace)
seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)

1
fs/ceph/super.h
View File

@ -40,6 +40,7 @@
#define CEPH_MOUNT_OPT_NOPOOLPERM (1<<11) /* no pool permission check */
#define CEPH_MOUNT_OPT_MOUNTWAIT (1<<12) /* mount waits if no mds is up */
#define CEPH_MOUNT_OPT_NOQUOTADF (1<<13) /* no root dir quota in statfs */
#define CEPH_MOUNT_OPT_NOCOPYFROM (1<<14) /* don't use RADOS 'copy-from' op */
#define CEPH_MOUNT_OPT_DEFAULT CEPH_MOUNT_OPT_DCACHE