| Message ID | 20201123145311.13588-1-lhenriques@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [RFC] ceph: add ceph.caps vxattr | expand |
On Mon, 2020-11-23 at 14:53 +0000, Luis Henriques wrote: > Add a new vxattr that allows userspace to list the caps for a specific > directory or file. > > Signed-off-by: Luis Henriques <lhenriques@suse.de> > --- > fs/ceph/xattr.c | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c > index 197cb1234341..996512e05513 100644 > --- a/fs/ceph/xattr.c > +++ b/fs/ceph/xattr.c > @@ -303,6 +303,18 @@ static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val, > ci->i_snap_btime.tv_nsec); > } > > > +static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val, > + size_t size) > +{ > + int issued; > + > + spin_lock(&ci->i_ceph_lock); > + issued = __ceph_caps_issued(ci, NULL); > + spin_unlock(&ci->i_ceph_lock); > + > + return ceph_fmt_xattr(val, size, "%s", ceph_cap_string(issued)); > +} > + > #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name > #define CEPH_XATTR_NAME2(_type, _name, _name2) \ > XATTR_CEPH_PREFIX #_type "." #_name "." #_name2 > @@ -378,6 +390,13 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = { > .exists_cb = ceph_vxattrcb_snap_btime_exists, > .flags = VXATTR_FLAG_READONLY, > }, > + { > + .name = "ceph.caps", > + .name_size = sizeof("ceph.caps"), > + .getxattr_cb = ceph_vxattrcb_caps, > + .exists_cb = NULL, > + .flags = VXATTR_FLAG_HIDDEN, > + }, > { .name = NULL, 0 } /* Required table terminator */ > }; > > > @@ -403,6 +422,13 @@ static struct ceph_vxattr ceph_file_vxattrs[] = { > .exists_cb = ceph_vxattrcb_snap_btime_exists, > .flags = VXATTR_FLAG_READONLY, > }, > + { > + .name = "ceph.caps", > + .name_size = sizeof("ceph.caps"), > + .getxattr_cb = ceph_vxattrcb_caps, > + .exists_cb = NULL, > + .flags = VXATTR_FLAG_HIDDEN, > + }, > { .name = NULL, 0 } /* Required table terminator */ > }; > > Looks useful! I'll plan to merge this unless anyone has objections.
On Mon, 2020-11-23 at 14:53 +0000, Luis Henriques wrote: > Add a new vxattr that allows userspace to list the caps for a specific > directory or file. > > Signed-off-by: Luis Henriques <lhenriques@suse.de> > --- > fs/ceph/xattr.c | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c > index 197cb1234341..996512e05513 100644 > --- a/fs/ceph/xattr.c > +++ b/fs/ceph/xattr.c > @@ -303,6 +303,18 @@ static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val, > ci->i_snap_btime.tv_nsec); > } > > > > > +static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val, > + size_t size) > +{ > + int issued; > + > + spin_lock(&ci->i_ceph_lock); > + issued = __ceph_caps_issued(ci, NULL); > + spin_unlock(&ci->i_ceph_lock); > + > + return ceph_fmt_xattr(val, size, "%s", ceph_cap_string(issued)); > +} I wonder if we ought to print a numerical (hex) representation of the cap set here in addition to the ceph_cap_string. A main use-case for this will be in testcases, and determining whether (e.g.) Fs is in the mask may be easier to do with a bitwise AND rather than having to parse a string of text. > + > #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name > #define CEPH_XATTR_NAME2(_type, _name, _name2) \ > XATTR_CEPH_PREFIX #_type "." #_name "." #_name2 > @@ -378,6 +390,13 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = { > .exists_cb = ceph_vxattrcb_snap_btime_exists, > .flags = VXATTR_FLAG_READONLY, > }, > + { > + .name = "ceph.caps", > + .name_size = sizeof("ceph.caps"), > + .getxattr_cb = ceph_vxattrcb_caps, > + .exists_cb = NULL, > + .flags = VXATTR_FLAG_HIDDEN, > + }, > { .name = NULL, 0 } /* Required table terminator */ > }; > > > > > @@ -403,6 +422,13 @@ static struct ceph_vxattr ceph_file_vxattrs[] = { > .exists_cb = ceph_vxattrcb_snap_btime_exists, > .flags = VXATTR_FLAG_READONLY, > }, > + { > + .name = "ceph.caps", > + .name_size = sizeof("ceph.caps"), > + .getxattr_cb = ceph_vxattrcb_caps, > + .exists_cb = NULL, > + .flags = VXATTR_FLAG_HIDDEN, > + }, > { .name = NULL, 0 } /* Required table terminator */ > }; > > > >
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c index 197cb1234341..996512e05513 100644 --- a/fs/ceph/xattr.c +++ b/fs/ceph/xattr.c @@ -303,6 +303,18 @@ static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val, ci->i_snap_btime.tv_nsec); } +static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val, + size_t size) +{ + int issued; + + spin_lock(&ci->i_ceph_lock); + issued = __ceph_caps_issued(ci, NULL); + spin_unlock(&ci->i_ceph_lock); + + return ceph_fmt_xattr(val, size, "%s", ceph_cap_string(issued)); +} + #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name #define CEPH_XATTR_NAME2(_type, _name, _name2) \ XATTR_CEPH_PREFIX #_type "." #_name "." #_name2 @@ -378,6 +390,13 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = { .exists_cb = ceph_vxattrcb_snap_btime_exists, .flags = VXATTR_FLAG_READONLY, }, + { + .name = "ceph.caps", + .name_size = sizeof("ceph.caps"), + .getxattr_cb = ceph_vxattrcb_caps, + .exists_cb = NULL, + .flags = VXATTR_FLAG_HIDDEN, + }, { .name = NULL, 0 } /* Required table terminator */ }; @@ -403,6 +422,13 @@ static struct ceph_vxattr ceph_file_vxattrs[] = { .exists_cb = ceph_vxattrcb_snap_btime_exists, .flags = VXATTR_FLAG_READONLY, }, + { + .name = "ceph.caps", + .name_size = sizeof("ceph.caps"), + .getxattr_cb = ceph_vxattrcb_caps, + .exists_cb = NULL, + .flags = VXATTR_FLAG_HIDDEN, + }, { .name = NULL, 0 } /* Required table terminator */ };
Add a new vxattr that allows userspace to list the caps for a specific directory or file. Signed-off-by: Luis Henriques <lhenriques@suse.de> --- fs/ceph/xattr.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)