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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
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@@ -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.
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