diff options
Diffstat (limited to 'xlators/features/metadisp/src/metadisp-unlink.c')
| -rw-r--r-- | xlators/features/metadisp/src/metadisp-unlink.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/xlators/features/metadisp/src/metadisp-unlink.c b/xlators/features/metadisp/src/metadisp-unlink.c new file mode 100644 index 00000000000..1f6a8eb35ce --- /dev/null +++ b/xlators/features/metadisp/src/metadisp-unlink.c @@ -0,0 +1,160 @@ + +#include "metadisp.h" +#include <glusterfs/call-stub.h> + +/** + * The unlink flow in metadisp is complicated because we must + * do ensure that UNLINK causes both the metadata objects + * to get removed and the data objects to get removed. + */ + +int32_t +metadisp_unlink_resume(call_frame_t *frame, xlator_t *this, loc_t *loc, + int xflag, dict_t *xdata) +{ + METADISP_TRACE("winding backend unlink to path %s", loc->path); + STACK_WIND(frame, default_unlink_cbk, DATA_CHILD(this), + DATA_CHILD(this)->fops->unlink, loc, xflag, xdata); + return 0; +} + +int32_t +metadisp_unlink_cbk(call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno, struct iatt *preparent, + struct iatt *postparent, dict_t *xdata) +{ + METADISP_TRACE(". %d %d", op_ret, op_errno); + + int ret = 0; + call_stub_t *stub = NULL; + int nlink = 0; + + if (cookie) { + stub = cookie; + } + + if (op_ret != 0) { + goto unwind; + } + + if (stub->poison) { + call_stub_destroy(stub); + stub = NULL; + return 0; + } + + ret = dict_get_uint32(xdata, GF_RESPONSE_LINK_COUNT_XDATA, &nlink); + if (ret != 0) { + op_errno = EINVAL; + op_ret = -1; + goto unwind; + } + METADISP_TRACE("frontend hardlink count %d %d", ret, nlink); + if (nlink > 1) { + goto unwind; + } + + call_resume(stub); + return 0; + +unwind: + if (stub) { + call_stub_destroy(stub); + } + STACK_UNWIND_STRICT(unlink, frame, op_ret, op_errno, preparent, postparent, + xdata); + return 0; +} + +int32_t +metadisp_unlink_lookup_cbk(call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno, inode_t *inode, + struct iatt *buf, dict_t *xdata, + struct iatt *postparent) +{ + call_stub_t *stub = NULL; + + if (cookie) { + stub = cookie; + } + + if (op_ret != 0) { + goto unwind; + } + + // fail fast on empty gfid so we don't loop forever + if (gf_uuid_is_null(buf->ia_gfid)) { + op_ret = -1; + op_errno = ENODATA; + goto unwind; + } + + // fill gfid since the stub is incomplete + memcpy(stub->args.loc.gfid, buf->ia_gfid, sizeof(uuid_t)); + memcpy(stub->args.loc.pargfid, postparent->ia_gfid, sizeof(uuid_t)); + + if (stub->poison) { + call_stub_destroy(stub); + stub = NULL; + return 0; + } + + call_resume(stub); + return 0; + +unwind: + if (stub) { + call_stub_destroy(stub); + } + STACK_UNWIND_STRICT(unlink, frame, op_ret, op_errno, NULL, NULL, NULL); + return 0; +} + +int32_t +metadisp_unlink(call_frame_t *frame, xlator_t *this, loc_t *loc, int xflag, + dict_t *xdata) +{ + call_stub_t *stub = NULL; + loc_t backend_loc = { + 0, + }; + + if (gf_uuid_is_null(loc->gfid)) { + METADISP_TRACE("winding lookup for unlink to path %s", loc->path); + + // loop back to ourselves after a lookup + stub = fop_unlink_stub(frame, metadisp_unlink, loc, xflag, xdata); + STACK_WIND_COOKIE(frame, metadisp_unlink_lookup_cbk, stub, + METADATA_CHILD(this), + METADATA_CHILD(this)->fops->lookup, loc, xdata); + return 0; + } + + if (build_backend_loc(loc->gfid, loc, &backend_loc)) { + goto unwind; + } + + // + // ensure we get the link count on the unlink response, so we can + // account for hardlinks before winding to the backend. + // NOTE: + // multiple xlators use GF_REQUEST_LINK_COUNT_XDATA. confirmation + // is needed to ensure that multiple requests will work in the same + // xlator stack. + // + if (!xdata) { + xdata = dict_new(); + } + dict_set_int32(xdata, GF_REQUEST_LINK_COUNT_XDATA, 1); + + METADISP_TRACE("winding frontend unlink to path %s", loc->path); + stub = fop_unlink_stub(frame, metadisp_unlink_resume, &backend_loc, xflag, + xdata); + + STACK_WIND_COOKIE(frame, metadisp_unlink_cbk, stub, METADATA_CHILD(this), + METADATA_CHILD(this)->fops->unlink, loc, xflag, xdata); + return 0; +unwind: + STACK_UNWIND_STRICT(unlink, frame, -1, EINVAL, NULL, NULL, NULL); + return 0; +} |