1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162116311641165116611671168116911701171117211731174117511761177117811791180118111821183118411851186118711881189119011911192119311941195119611971198119912001201120212031204120512061207120812091210121112121213121412151216121712181219122012211222122312241225122612271228122912301231123212331234123512361237123812391240124112421243124412451246124712481249125012511252125312541255125612571258125912601261126212631264126512661267126812691270127112721273127412751276127712781279128012811282128312841285128612871288128912901291129212931294129512961297129812991300130113021303130413051306130713081309131013111312131313141315131613171318131913201321132213231324132513261327132813291330133113321333133413351336133713381339134013411342134313441345134613471348134913501351135213531354135513561357135813591360136113621363136413651366136713681369137013711372137313741375137613771378137913801381138213831384138513861387138813891390139113921393139413951396139713981399140014011402140314041405140614071408140914101411141214131414141514161417141814191420 |
- // SPDX-License-Identifier: GPL-2.0
- #include <linux/ceph/ceph_debug.h>
- #include <linux/ceph/pagelist.h>
- #include "super.h"
- #include "mds_client.h"
- #include <linux/ceph/decode.h>
- #include <linux/xattr.h>
- #include <linux/security.h>
- #include <linux/posix_acl_xattr.h>
- #include <linux/slab.h>
- #define XATTR_CEPH_PREFIX "ceph."
- #define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
- static int __remove_xattr(struct ceph_inode_info *ci,
- struct ceph_inode_xattr *xattr);
- static bool ceph_is_valid_xattr(const char *name)
- {
- return !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) ||
- !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
- !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
- !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
- }
- /*
- * These define virtual xattrs exposing the recursive directory
- * statistics and layout metadata.
- */
- struct ceph_vxattr {
- char *name;
- size_t name_size; /* strlen(name) + 1 (for '\0') */
- ssize_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
- size_t size);
- bool (*exists_cb)(struct ceph_inode_info *ci);
- unsigned int flags;
- };
- #define VXATTR_FLAG_READONLY (1<<0)
- #define VXATTR_FLAG_HIDDEN (1<<1)
- #define VXATTR_FLAG_RSTAT (1<<2)
- #define VXATTR_FLAG_DIRSTAT (1<<3)
- /* layouts */
- static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
- {
- struct ceph_file_layout *fl = &ci->i_layout;
- return (fl->stripe_unit > 0 || fl->stripe_count > 0 ||
- fl->object_size > 0 || fl->pool_id >= 0 ||
- rcu_dereference_raw(fl->pool_ns) != NULL);
- }
- static ssize_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- struct ceph_fs_client *fsc = ceph_sb_to_client(ci->netfs.inode.i_sb);
- struct ceph_osd_client *osdc = &fsc->client->osdc;
- struct ceph_string *pool_ns;
- s64 pool = ci->i_layout.pool_id;
- const char *pool_name;
- const char *ns_field = " pool_namespace=";
- char buf[128];
- size_t len, total_len = 0;
- ssize_t ret;
- pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
- dout("ceph_vxattrcb_layout %p\n", &ci->netfs.inode);
- down_read(&osdc->lock);
- pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
- if (pool_name) {
- len = snprintf(buf, sizeof(buf),
- "stripe_unit=%u stripe_count=%u object_size=%u pool=",
- ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
- ci->i_layout.object_size);
- total_len = len + strlen(pool_name);
- } else {
- len = snprintf(buf, sizeof(buf),
- "stripe_unit=%u stripe_count=%u object_size=%u pool=%lld",
- ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
- ci->i_layout.object_size, pool);
- total_len = len;
- }
- if (pool_ns)
- total_len += strlen(ns_field) + pool_ns->len;
- ret = total_len;
- if (size >= total_len) {
- memcpy(val, buf, len);
- ret = len;
- if (pool_name) {
- len = strlen(pool_name);
- memcpy(val + ret, pool_name, len);
- ret += len;
- }
- if (pool_ns) {
- len = strlen(ns_field);
- memcpy(val + ret, ns_field, len);
- ret += len;
- memcpy(val + ret, pool_ns->str, pool_ns->len);
- ret += pool_ns->len;
- }
- }
- up_read(&osdc->lock);
- ceph_put_string(pool_ns);
- return ret;
- }
- /*
- * The convention with strings in xattrs is that they should not be NULL
- * terminated, since we're returning the length with them. snprintf always
- * NULL terminates however, so call it on a temporary buffer and then memcpy
- * the result into place.
- */
- static __printf(3, 4)
- int ceph_fmt_xattr(char *val, size_t size, const char *fmt, ...)
- {
- int ret;
- va_list args;
- char buf[96]; /* NB: reevaluate size if new vxattrs are added */
- va_start(args, fmt);
- ret = vsnprintf(buf, size ? sizeof(buf) : 0, fmt, args);
- va_end(args);
- /* Sanity check */
- if (size && ret + 1 > sizeof(buf)) {
- WARN_ONCE(true, "Returned length too big (%d)", ret);
- return -E2BIG;
- }
- if (ret <= size)
- memcpy(val, buf, ret);
- return ret;
- }
- static ssize_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
- char *val, size_t size)
- {
- return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_unit);
- }
- static ssize_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
- char *val, size_t size)
- {
- return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_count);
- }
- static ssize_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
- char *val, size_t size)
- {
- return ceph_fmt_xattr(val, size, "%u", ci->i_layout.object_size);
- }
- static ssize_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
- char *val, size_t size)
- {
- ssize_t ret;
- struct ceph_fs_client *fsc = ceph_sb_to_client(ci->netfs.inode.i_sb);
- struct ceph_osd_client *osdc = &fsc->client->osdc;
- s64 pool = ci->i_layout.pool_id;
- const char *pool_name;
- down_read(&osdc->lock);
- pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
- if (pool_name) {
- ret = strlen(pool_name);
- if (ret <= size)
- memcpy(val, pool_name, ret);
- } else {
- ret = ceph_fmt_xattr(val, size, "%lld", pool);
- }
- up_read(&osdc->lock);
- return ret;
- }
- static ssize_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci,
- char *val, size_t size)
- {
- ssize_t ret = 0;
- struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns);
- if (ns) {
- ret = ns->len;
- if (ret <= size)
- memcpy(val, ns->str, ret);
- ceph_put_string(ns);
- }
- return ret;
- }
- /* directories */
- static ssize_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%lld", ci->i_files + ci->i_subdirs);
- }
- static ssize_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%lld", ci->i_files);
- }
- static ssize_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%lld", ci->i_subdirs);
- }
- static ssize_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%lld",
- ci->i_rfiles + ci->i_rsubdirs);
- }
- static ssize_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%lld", ci->i_rfiles);
- }
- static ssize_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%lld", ci->i_rsubdirs);
- }
- static ssize_t ceph_vxattrcb_dir_rsnaps(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%lld", ci->i_rsnaps);
- }
- static ssize_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%lld", ci->i_rbytes);
- }
- static ssize_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_rctime.tv_sec,
- ci->i_rctime.tv_nsec);
- }
- /* dir pin */
- static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci)
- {
- return ci->i_dir_pin != -ENODATA;
- }
- static ssize_t ceph_vxattrcb_dir_pin(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%d", (int)ci->i_dir_pin);
- }
- /* quotas */
- static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci)
- {
- bool ret = false;
- spin_lock(&ci->i_ceph_lock);
- if ((ci->i_max_files || ci->i_max_bytes) &&
- ci->i_vino.snap == CEPH_NOSNAP &&
- ci->i_snap_realm &&
- ci->i_snap_realm->ino == ci->i_vino.ino)
- ret = true;
- spin_unlock(&ci->i_ceph_lock);
- return ret;
- }
- static ssize_t ceph_vxattrcb_quota(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "max_bytes=%llu max_files=%llu",
- ci->i_max_bytes, ci->i_max_files);
- }
- static ssize_t ceph_vxattrcb_quota_max_bytes(struct ceph_inode_info *ci,
- char *val, size_t size)
- {
- return ceph_fmt_xattr(val, size, "%llu", ci->i_max_bytes);
- }
- static ssize_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci,
- char *val, size_t size)
- {
- return ceph_fmt_xattr(val, size, "%llu", ci->i_max_files);
- }
- /* snapshots */
- static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci)
- {
- return (ci->i_snap_btime.tv_sec != 0 || ci->i_snap_btime.tv_nsec != 0);
- }
- static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val,
- size_t size)
- {
- return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec,
- ci->i_snap_btime.tv_nsec);
- }
- static ssize_t ceph_vxattrcb_cluster_fsid(struct ceph_inode_info *ci,
- char *val, size_t size)
- {
- struct ceph_fs_client *fsc = ceph_sb_to_client(ci->netfs.inode.i_sb);
- return ceph_fmt_xattr(val, size, "%pU", &fsc->client->fsid);
- }
- static ssize_t ceph_vxattrcb_client_id(struct ceph_inode_info *ci,
- char *val, size_t size)
- {
- struct ceph_fs_client *fsc = ceph_sb_to_client(ci->netfs.inode.i_sb);
- return ceph_fmt_xattr(val, size, "client%lld",
- ceph_client_gid(fsc->client));
- }
- 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/0x%x",
- ceph_cap_string(issued), issued);
- }
- static ssize_t ceph_vxattrcb_auth_mds(struct ceph_inode_info *ci,
- char *val, size_t size)
- {
- int ret;
- spin_lock(&ci->i_ceph_lock);
- ret = ceph_fmt_xattr(val, size, "%d",
- ci->i_auth_cap ? ci->i_auth_cap->session->s_mds : -1);
- spin_unlock(&ci->i_ceph_lock);
- return ret;
- }
- #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
- #define CEPH_XATTR_NAME2(_type, _name, _name2) \
- XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
- #define XATTR_NAME_CEPH(_type, _name, _flags) \
- { \
- .name = CEPH_XATTR_NAME(_type, _name), \
- .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
- .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
- .exists_cb = NULL, \
- .flags = (VXATTR_FLAG_READONLY | _flags), \
- }
- #define XATTR_RSTAT_FIELD(_type, _name) \
- XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT)
- #define XATTR_RSTAT_FIELD_UPDATABLE(_type, _name) \
- { \
- .name = CEPH_XATTR_NAME(_type, _name), \
- .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
- .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
- .exists_cb = NULL, \
- .flags = VXATTR_FLAG_RSTAT, \
- }
- #define XATTR_LAYOUT_FIELD(_type, _name, _field) \
- { \
- .name = CEPH_XATTR_NAME2(_type, _name, _field), \
- .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
- .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
- .exists_cb = ceph_vxattrcb_layout_exists, \
- .flags = VXATTR_FLAG_HIDDEN, \
- }
- #define XATTR_QUOTA_FIELD(_type, _name) \
- { \
- .name = CEPH_XATTR_NAME(_type, _name), \
- .name_size = sizeof(CEPH_XATTR_NAME(_type, _name)), \
- .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
- .exists_cb = ceph_vxattrcb_quota_exists, \
- .flags = VXATTR_FLAG_HIDDEN, \
- }
- static struct ceph_vxattr ceph_dir_vxattrs[] = {
- {
- .name = "ceph.dir.layout",
- .name_size = sizeof("ceph.dir.layout"),
- .getxattr_cb = ceph_vxattrcb_layout,
- .exists_cb = ceph_vxattrcb_layout_exists,
- .flags = VXATTR_FLAG_HIDDEN,
- },
- XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
- XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
- XATTR_LAYOUT_FIELD(dir, layout, object_size),
- XATTR_LAYOUT_FIELD(dir, layout, pool),
- XATTR_LAYOUT_FIELD(dir, layout, pool_namespace),
- XATTR_NAME_CEPH(dir, entries, VXATTR_FLAG_DIRSTAT),
- XATTR_NAME_CEPH(dir, files, VXATTR_FLAG_DIRSTAT),
- XATTR_NAME_CEPH(dir, subdirs, VXATTR_FLAG_DIRSTAT),
- XATTR_RSTAT_FIELD(dir, rentries),
- XATTR_RSTAT_FIELD(dir, rfiles),
- XATTR_RSTAT_FIELD(dir, rsubdirs),
- XATTR_RSTAT_FIELD(dir, rsnaps),
- XATTR_RSTAT_FIELD(dir, rbytes),
- XATTR_RSTAT_FIELD_UPDATABLE(dir, rctime),
- {
- .name = "ceph.dir.pin",
- .name_size = sizeof("ceph.dir.pin"),
- .getxattr_cb = ceph_vxattrcb_dir_pin,
- .exists_cb = ceph_vxattrcb_dir_pin_exists,
- .flags = VXATTR_FLAG_HIDDEN,
- },
- {
- .name = "ceph.quota",
- .name_size = sizeof("ceph.quota"),
- .getxattr_cb = ceph_vxattrcb_quota,
- .exists_cb = ceph_vxattrcb_quota_exists,
- .flags = VXATTR_FLAG_HIDDEN,
- },
- XATTR_QUOTA_FIELD(quota, max_bytes),
- XATTR_QUOTA_FIELD(quota, max_files),
- {
- .name = "ceph.snap.btime",
- .name_size = sizeof("ceph.snap.btime"),
- .getxattr_cb = ceph_vxattrcb_snap_btime,
- .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 */
- };
- /* files */
- static struct ceph_vxattr ceph_file_vxattrs[] = {
- {
- .name = "ceph.file.layout",
- .name_size = sizeof("ceph.file.layout"),
- .getxattr_cb = ceph_vxattrcb_layout,
- .exists_cb = ceph_vxattrcb_layout_exists,
- .flags = VXATTR_FLAG_HIDDEN,
- },
- XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
- XATTR_LAYOUT_FIELD(file, layout, stripe_count),
- XATTR_LAYOUT_FIELD(file, layout, object_size),
- XATTR_LAYOUT_FIELD(file, layout, pool),
- XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
- {
- .name = "ceph.snap.btime",
- .name_size = sizeof("ceph.snap.btime"),
- .getxattr_cb = ceph_vxattrcb_snap_btime,
- .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 */
- };
- static struct ceph_vxattr ceph_common_vxattrs[] = {
- {
- .name = "ceph.cluster_fsid",
- .name_size = sizeof("ceph.cluster_fsid"),
- .getxattr_cb = ceph_vxattrcb_cluster_fsid,
- .exists_cb = NULL,
- .flags = VXATTR_FLAG_READONLY,
- },
- {
- .name = "ceph.client_id",
- .name_size = sizeof("ceph.client_id"),
- .getxattr_cb = ceph_vxattrcb_client_id,
- .exists_cb = NULL,
- .flags = VXATTR_FLAG_READONLY,
- },
- {
- .name = "ceph.auth_mds",
- .name_size = sizeof("ceph.auth_mds"),
- .getxattr_cb = ceph_vxattrcb_auth_mds,
- .exists_cb = NULL,
- .flags = VXATTR_FLAG_READONLY,
- },
- { .name = NULL, 0 } /* Required table terminator */
- };
- static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
- {
- if (S_ISDIR(inode->i_mode))
- return ceph_dir_vxattrs;
- else if (S_ISREG(inode->i_mode))
- return ceph_file_vxattrs;
- return NULL;
- }
- static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
- const char *name)
- {
- struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
- if (vxattr) {
- while (vxattr->name) {
- if (!strcmp(vxattr->name, name))
- return vxattr;
- vxattr++;
- }
- }
- vxattr = ceph_common_vxattrs;
- while (vxattr->name) {
- if (!strcmp(vxattr->name, name))
- return vxattr;
- vxattr++;
- }
- return NULL;
- }
- static int __set_xattr(struct ceph_inode_info *ci,
- const char *name, int name_len,
- const char *val, int val_len,
- int flags, int update_xattr,
- struct ceph_inode_xattr **newxattr)
- {
- struct rb_node **p;
- struct rb_node *parent = NULL;
- struct ceph_inode_xattr *xattr = NULL;
- int c;
- int new = 0;
- p = &ci->i_xattrs.index.rb_node;
- while (*p) {
- parent = *p;
- xattr = rb_entry(parent, struct ceph_inode_xattr, node);
- c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
- if (c < 0)
- p = &(*p)->rb_left;
- else if (c > 0)
- p = &(*p)->rb_right;
- else {
- if (name_len == xattr->name_len)
- break;
- else if (name_len < xattr->name_len)
- p = &(*p)->rb_left;
- else
- p = &(*p)->rb_right;
- }
- xattr = NULL;
- }
- if (update_xattr) {
- int err = 0;
- if (xattr && (flags & XATTR_CREATE))
- err = -EEXIST;
- else if (!xattr && (flags & XATTR_REPLACE))
- err = -ENODATA;
- if (err) {
- kfree(name);
- kfree(val);
- kfree(*newxattr);
- return err;
- }
- if (update_xattr < 0) {
- if (xattr)
- __remove_xattr(ci, xattr);
- kfree(name);
- kfree(*newxattr);
- return 0;
- }
- }
- if (!xattr) {
- new = 1;
- xattr = *newxattr;
- xattr->name = name;
- xattr->name_len = name_len;
- xattr->should_free_name = update_xattr;
- ci->i_xattrs.count++;
- dout("__set_xattr count=%d\n", ci->i_xattrs.count);
- } else {
- kfree(*newxattr);
- *newxattr = NULL;
- if (xattr->should_free_val)
- kfree(xattr->val);
- if (update_xattr) {
- kfree(name);
- name = xattr->name;
- }
- ci->i_xattrs.names_size -= xattr->name_len;
- ci->i_xattrs.vals_size -= xattr->val_len;
- }
- ci->i_xattrs.names_size += name_len;
- ci->i_xattrs.vals_size += val_len;
- if (val)
- xattr->val = val;
- else
- xattr->val = "";
- xattr->val_len = val_len;
- xattr->dirty = update_xattr;
- xattr->should_free_val = (val && update_xattr);
- if (new) {
- rb_link_node(&xattr->node, parent, p);
- rb_insert_color(&xattr->node, &ci->i_xattrs.index);
- dout("__set_xattr_val p=%p\n", p);
- }
- dout("__set_xattr_val added %llx.%llx xattr %p %.*s=%.*s\n",
- ceph_vinop(&ci->netfs.inode), xattr, name_len, name, val_len, val);
- return 0;
- }
- static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
- const char *name)
- {
- struct rb_node **p;
- struct rb_node *parent = NULL;
- struct ceph_inode_xattr *xattr = NULL;
- int name_len = strlen(name);
- int c;
- p = &ci->i_xattrs.index.rb_node;
- while (*p) {
- parent = *p;
- xattr = rb_entry(parent, struct ceph_inode_xattr, node);
- c = strncmp(name, xattr->name, xattr->name_len);
- if (c == 0 && name_len > xattr->name_len)
- c = 1;
- if (c < 0)
- p = &(*p)->rb_left;
- else if (c > 0)
- p = &(*p)->rb_right;
- else {
- dout("__get_xattr %s: found %.*s\n", name,
- xattr->val_len, xattr->val);
- return xattr;
- }
- }
- dout("__get_xattr %s: not found\n", name);
- return NULL;
- }
- static void __free_xattr(struct ceph_inode_xattr *xattr)
- {
- BUG_ON(!xattr);
- if (xattr->should_free_name)
- kfree(xattr->name);
- if (xattr->should_free_val)
- kfree(xattr->val);
- kfree(xattr);
- }
- static int __remove_xattr(struct ceph_inode_info *ci,
- struct ceph_inode_xattr *xattr)
- {
- if (!xattr)
- return -ENODATA;
- rb_erase(&xattr->node, &ci->i_xattrs.index);
- if (xattr->should_free_name)
- kfree(xattr->name);
- if (xattr->should_free_val)
- kfree(xattr->val);
- ci->i_xattrs.names_size -= xattr->name_len;
- ci->i_xattrs.vals_size -= xattr->val_len;
- ci->i_xattrs.count--;
- kfree(xattr);
- return 0;
- }
- static char *__copy_xattr_names(struct ceph_inode_info *ci,
- char *dest)
- {
- struct rb_node *p;
- struct ceph_inode_xattr *xattr = NULL;
- p = rb_first(&ci->i_xattrs.index);
- dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
- while (p) {
- xattr = rb_entry(p, struct ceph_inode_xattr, node);
- memcpy(dest, xattr->name, xattr->name_len);
- dest[xattr->name_len] = '\0';
- dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
- xattr->name_len, ci->i_xattrs.names_size);
- dest += xattr->name_len + 1;
- p = rb_next(p);
- }
- return dest;
- }
- void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
- {
- struct rb_node *p, *tmp;
- struct ceph_inode_xattr *xattr = NULL;
- p = rb_first(&ci->i_xattrs.index);
- dout("__ceph_destroy_xattrs p=%p\n", p);
- while (p) {
- xattr = rb_entry(p, struct ceph_inode_xattr, node);
- tmp = p;
- p = rb_next(tmp);
- dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
- xattr->name_len, xattr->name);
- rb_erase(tmp, &ci->i_xattrs.index);
- __free_xattr(xattr);
- }
- ci->i_xattrs.names_size = 0;
- ci->i_xattrs.vals_size = 0;
- ci->i_xattrs.index_version = 0;
- ci->i_xattrs.count = 0;
- ci->i_xattrs.index = RB_ROOT;
- }
- static int __build_xattrs(struct inode *inode)
- __releases(ci->i_ceph_lock)
- __acquires(ci->i_ceph_lock)
- {
- u32 namelen;
- u32 numattr = 0;
- void *p, *end;
- u32 len;
- const char *name, *val;
- struct ceph_inode_info *ci = ceph_inode(inode);
- u64 xattr_version;
- struct ceph_inode_xattr **xattrs = NULL;
- int err = 0;
- int i;
- dout("__build_xattrs() len=%d\n",
- ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
- if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
- return 0; /* already built */
- __ceph_destroy_xattrs(ci);
- start:
- /* updated internal xattr rb tree */
- if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
- p = ci->i_xattrs.blob->vec.iov_base;
- end = p + ci->i_xattrs.blob->vec.iov_len;
- ceph_decode_32_safe(&p, end, numattr, bad);
- xattr_version = ci->i_xattrs.version;
- spin_unlock(&ci->i_ceph_lock);
- xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
- GFP_NOFS);
- err = -ENOMEM;
- if (!xattrs)
- goto bad_lock;
- for (i = 0; i < numattr; i++) {
- xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
- GFP_NOFS);
- if (!xattrs[i])
- goto bad_lock;
- }
- spin_lock(&ci->i_ceph_lock);
- if (ci->i_xattrs.version != xattr_version) {
- /* lost a race, retry */
- for (i = 0; i < numattr; i++)
- kfree(xattrs[i]);
- kfree(xattrs);
- xattrs = NULL;
- goto start;
- }
- err = -EIO;
- while (numattr--) {
- ceph_decode_32_safe(&p, end, len, bad);
- namelen = len;
- name = p;
- p += len;
- ceph_decode_32_safe(&p, end, len, bad);
- val = p;
- p += len;
- err = __set_xattr(ci, name, namelen, val, len,
- 0, 0, &xattrs[numattr]);
- if (err < 0)
- goto bad;
- }
- kfree(xattrs);
- }
- ci->i_xattrs.index_version = ci->i_xattrs.version;
- ci->i_xattrs.dirty = false;
- return err;
- bad_lock:
- spin_lock(&ci->i_ceph_lock);
- bad:
- if (xattrs) {
- for (i = 0; i < numattr; i++)
- kfree(xattrs[i]);
- kfree(xattrs);
- }
- ci->i_xattrs.names_size = 0;
- return err;
- }
- static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
- int val_size)
- {
- /*
- * 4 bytes for the length, and additional 4 bytes per each xattr name,
- * 4 bytes per each value
- */
- int size = 4 + ci->i_xattrs.count*(4 + 4) +
- ci->i_xattrs.names_size +
- ci->i_xattrs.vals_size;
- dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
- ci->i_xattrs.count, ci->i_xattrs.names_size,
- ci->i_xattrs.vals_size);
- if (name_size)
- size += 4 + 4 + name_size + val_size;
- return size;
- }
- /*
- * If there are dirty xattrs, reencode xattrs into the prealloc_blob
- * and swap into place. It returns the old i_xattrs.blob (or NULL) so
- * that it can be freed by the caller as the i_ceph_lock is likely to be
- * held.
- */
- struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci)
- {
- struct rb_node *p;
- struct ceph_inode_xattr *xattr = NULL;
- struct ceph_buffer *old_blob = NULL;
- void *dest;
- dout("__build_xattrs_blob %p\n", &ci->netfs.inode);
- if (ci->i_xattrs.dirty) {
- int need = __get_required_blob_size(ci, 0, 0);
- BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
- p = rb_first(&ci->i_xattrs.index);
- dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
- ceph_encode_32(&dest, ci->i_xattrs.count);
- while (p) {
- xattr = rb_entry(p, struct ceph_inode_xattr, node);
- ceph_encode_32(&dest, xattr->name_len);
- memcpy(dest, xattr->name, xattr->name_len);
- dest += xattr->name_len;
- ceph_encode_32(&dest, xattr->val_len);
- memcpy(dest, xattr->val, xattr->val_len);
- dest += xattr->val_len;
- p = rb_next(p);
- }
- /* adjust buffer len; it may be larger than we need */
- ci->i_xattrs.prealloc_blob->vec.iov_len =
- dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
- if (ci->i_xattrs.blob)
- old_blob = ci->i_xattrs.blob;
- ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
- ci->i_xattrs.prealloc_blob = NULL;
- ci->i_xattrs.dirty = false;
- ci->i_xattrs.version++;
- }
- return old_blob;
- }
- static inline int __get_request_mask(struct inode *in) {
- struct ceph_mds_request *req = current->journal_info;
- int mask = 0;
- if (req && req->r_target_inode == in) {
- if (req->r_op == CEPH_MDS_OP_LOOKUP ||
- req->r_op == CEPH_MDS_OP_LOOKUPINO ||
- req->r_op == CEPH_MDS_OP_LOOKUPPARENT ||
- req->r_op == CEPH_MDS_OP_GETATTR) {
- mask = le32_to_cpu(req->r_args.getattr.mask);
- } else if (req->r_op == CEPH_MDS_OP_OPEN ||
- req->r_op == CEPH_MDS_OP_CREATE) {
- mask = le32_to_cpu(req->r_args.open.mask);
- }
- }
- return mask;
- }
- ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
- size_t size)
- {
- struct ceph_inode_info *ci = ceph_inode(inode);
- struct ceph_inode_xattr *xattr;
- struct ceph_vxattr *vxattr;
- int req_mask;
- ssize_t err;
- if (strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
- goto handle_non_vxattrs;
- /* let's see if a virtual xattr was requested */
- vxattr = ceph_match_vxattr(inode, name);
- if (vxattr) {
- int mask = 0;
- if (vxattr->flags & VXATTR_FLAG_RSTAT)
- mask |= CEPH_STAT_RSTAT;
- if (vxattr->flags & VXATTR_FLAG_DIRSTAT)
- mask |= CEPH_CAP_FILE_SHARED;
- err = ceph_do_getattr(inode, mask, true);
- if (err)
- return err;
- err = -ENODATA;
- if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
- err = vxattr->getxattr_cb(ci, value, size);
- if (size && size < err)
- err = -ERANGE;
- }
- return err;
- } else {
- err = ceph_do_getvxattr(inode, name, value, size);
- /* this would happen with a new client and old server combo */
- if (err == -EOPNOTSUPP)
- err = -ENODATA;
- return err;
- }
- handle_non_vxattrs:
- req_mask = __get_request_mask(inode);
- spin_lock(&ci->i_ceph_lock);
- dout("getxattr %p name '%s' ver=%lld index_ver=%lld\n", inode, name,
- ci->i_xattrs.version, ci->i_xattrs.index_version);
- if (ci->i_xattrs.version == 0 ||
- !((req_mask & CEPH_CAP_XATTR_SHARED) ||
- __ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1))) {
- spin_unlock(&ci->i_ceph_lock);
- /* security module gets xattr while filling trace */
- if (current->journal_info) {
- pr_warn_ratelimited("sync getxattr %p "
- "during filling trace\n", inode);
- return -EBUSY;
- }
- /* get xattrs from mds (if we don't already have them) */
- err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
- if (err)
- return err;
- spin_lock(&ci->i_ceph_lock);
- }
- err = __build_xattrs(inode);
- if (err < 0)
- goto out;
- err = -ENODATA; /* == ENOATTR */
- xattr = __get_xattr(ci, name);
- if (!xattr)
- goto out;
- err = -ERANGE;
- if (size && size < xattr->val_len)
- goto out;
- err = xattr->val_len;
- if (size == 0)
- goto out;
- memcpy(value, xattr->val, xattr->val_len);
- if (current->journal_info &&
- !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
- security_ismaclabel(name + XATTR_SECURITY_PREFIX_LEN))
- ci->i_ceph_flags |= CEPH_I_SEC_INITED;
- out:
- spin_unlock(&ci->i_ceph_lock);
- return err;
- }
- ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
- {
- struct inode *inode = d_inode(dentry);
- struct ceph_inode_info *ci = ceph_inode(inode);
- bool len_only = (size == 0);
- u32 namelen;
- int err;
- spin_lock(&ci->i_ceph_lock);
- dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
- ci->i_xattrs.version, ci->i_xattrs.index_version);
- if (ci->i_xattrs.version == 0 ||
- !__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1)) {
- spin_unlock(&ci->i_ceph_lock);
- err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
- if (err)
- return err;
- spin_lock(&ci->i_ceph_lock);
- }
- err = __build_xattrs(inode);
- if (err < 0)
- goto out;
- /* add 1 byte for each xattr due to the null termination */
- namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
- if (!len_only) {
- if (namelen > size) {
- err = -ERANGE;
- goto out;
- }
- names = __copy_xattr_names(ci, names);
- size -= namelen;
- }
- err = namelen;
- out:
- spin_unlock(&ci->i_ceph_lock);
- return err;
- }
- static int ceph_sync_setxattr(struct inode *inode, const char *name,
- const char *value, size_t size, int flags)
- {
- struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
- struct ceph_inode_info *ci = ceph_inode(inode);
- struct ceph_mds_request *req;
- struct ceph_mds_client *mdsc = fsc->mdsc;
- struct ceph_osd_client *osdc = &fsc->client->osdc;
- struct ceph_pagelist *pagelist = NULL;
- int op = CEPH_MDS_OP_SETXATTR;
- int err;
- if (size > 0) {
- /* copy value into pagelist */
- pagelist = ceph_pagelist_alloc(GFP_NOFS);
- if (!pagelist)
- return -ENOMEM;
- err = ceph_pagelist_append(pagelist, value, size);
- if (err)
- goto out;
- } else if (!value) {
- if (flags & CEPH_XATTR_REPLACE)
- op = CEPH_MDS_OP_RMXATTR;
- else
- flags |= CEPH_XATTR_REMOVE;
- }
- dout("setxattr value size: %zu\n", size);
- /* do request */
- req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
- if (IS_ERR(req)) {
- err = PTR_ERR(req);
- goto out;
- }
- req->r_path2 = kstrdup(name, GFP_NOFS);
- if (!req->r_path2) {
- ceph_mdsc_put_request(req);
- err = -ENOMEM;
- goto out;
- }
- if (op == CEPH_MDS_OP_SETXATTR) {
- req->r_args.setxattr.flags = cpu_to_le32(flags);
- req->r_args.setxattr.osdmap_epoch =
- cpu_to_le32(osdc->osdmap->epoch);
- req->r_pagelist = pagelist;
- pagelist = NULL;
- }
- req->r_inode = inode;
- ihold(inode);
- req->r_num_caps = 1;
- req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
- dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
- err = ceph_mdsc_do_request(mdsc, NULL, req);
- ceph_mdsc_put_request(req);
- dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
- out:
- if (pagelist)
- ceph_pagelist_release(pagelist);
- return err;
- }
- int __ceph_setxattr(struct inode *inode, const char *name,
- const void *value, size_t size, int flags)
- {
- struct ceph_vxattr *vxattr;
- struct ceph_inode_info *ci = ceph_inode(inode);
- struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
- struct ceph_cap_flush *prealloc_cf = NULL;
- struct ceph_buffer *old_blob = NULL;
- int issued;
- int err;
- int dirty = 0;
- int name_len = strlen(name);
- int val_len = size;
- char *newname = NULL;
- char *newval = NULL;
- struct ceph_inode_xattr *xattr = NULL;
- int required_blob_size;
- bool check_realm = false;
- bool lock_snap_rwsem = false;
- if (ceph_snap(inode) != CEPH_NOSNAP)
- return -EROFS;
- vxattr = ceph_match_vxattr(inode, name);
- if (vxattr) {
- if (vxattr->flags & VXATTR_FLAG_READONLY)
- return -EOPNOTSUPP;
- if (value && !strncmp(vxattr->name, "ceph.quota", 10))
- check_realm = true;
- }
- /* pass any unhandled ceph.* xattrs through to the MDS */
- if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
- goto do_sync_unlocked;
- /* preallocate memory for xattr name, value, index node */
- err = -ENOMEM;
- newname = kmemdup(name, name_len + 1, GFP_NOFS);
- if (!newname)
- goto out;
- if (val_len) {
- newval = kmemdup(value, val_len, GFP_NOFS);
- if (!newval)
- goto out;
- }
- xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
- if (!xattr)
- goto out;
- prealloc_cf = ceph_alloc_cap_flush();
- if (!prealloc_cf)
- goto out;
- spin_lock(&ci->i_ceph_lock);
- retry:
- issued = __ceph_caps_issued(ci, NULL);
- required_blob_size = __get_required_blob_size(ci, name_len, val_len);
- if ((ci->i_xattrs.version == 0) || !(issued & CEPH_CAP_XATTR_EXCL) ||
- (required_blob_size > mdsc->mdsmap->m_max_xattr_size)) {
- dout("%s do sync setxattr: version: %llu size: %d max: %llu\n",
- __func__, ci->i_xattrs.version, required_blob_size,
- mdsc->mdsmap->m_max_xattr_size);
- goto do_sync;
- }
- if (!lock_snap_rwsem && !ci->i_head_snapc) {
- lock_snap_rwsem = true;
- if (!down_read_trylock(&mdsc->snap_rwsem)) {
- spin_unlock(&ci->i_ceph_lock);
- down_read(&mdsc->snap_rwsem);
- spin_lock(&ci->i_ceph_lock);
- goto retry;
- }
- }
- dout("setxattr %p name '%s' issued %s\n", inode, name,
- ceph_cap_string(issued));
- __build_xattrs(inode);
- if (!ci->i_xattrs.prealloc_blob ||
- required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
- struct ceph_buffer *blob;
- spin_unlock(&ci->i_ceph_lock);
- ceph_buffer_put(old_blob); /* Shouldn't be required */
- dout(" pre-allocating new blob size=%d\n", required_blob_size);
- blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
- if (!blob)
- goto do_sync_unlocked;
- spin_lock(&ci->i_ceph_lock);
- /* prealloc_blob can't be released while holding i_ceph_lock */
- if (ci->i_xattrs.prealloc_blob)
- old_blob = ci->i_xattrs.prealloc_blob;
- ci->i_xattrs.prealloc_blob = blob;
- goto retry;
- }
- err = __set_xattr(ci, newname, name_len, newval, val_len,
- flags, value ? 1 : -1, &xattr);
- if (!err) {
- dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
- &prealloc_cf);
- ci->i_xattrs.dirty = true;
- inode->i_ctime = current_time(inode);
- }
- spin_unlock(&ci->i_ceph_lock);
- ceph_buffer_put(old_blob);
- if (lock_snap_rwsem)
- up_read(&mdsc->snap_rwsem);
- if (dirty)
- __mark_inode_dirty(inode, dirty);
- ceph_free_cap_flush(prealloc_cf);
- return err;
- do_sync:
- spin_unlock(&ci->i_ceph_lock);
- do_sync_unlocked:
- if (lock_snap_rwsem)
- up_read(&mdsc->snap_rwsem);
- /* security module set xattr while filling trace */
- if (current->journal_info) {
- pr_warn_ratelimited("sync setxattr %p "
- "during filling trace\n", inode);
- err = -EBUSY;
- } else {
- err = ceph_sync_setxattr(inode, name, value, size, flags);
- if (err >= 0 && check_realm) {
- /* check if snaprealm was created for quota inode */
- spin_lock(&ci->i_ceph_lock);
- if ((ci->i_max_files || ci->i_max_bytes) &&
- !(ci->i_snap_realm &&
- ci->i_snap_realm->ino == ci->i_vino.ino))
- err = -EOPNOTSUPP;
- spin_unlock(&ci->i_ceph_lock);
- }
- }
- out:
- ceph_free_cap_flush(prealloc_cf);
- kfree(newname);
- kfree(newval);
- kfree(xattr);
- return err;
- }
- static int ceph_get_xattr_handler(const struct xattr_handler *handler,
- struct dentry *dentry, struct inode *inode,
- const char *name, void *value, size_t size)
- {
- if (!ceph_is_valid_xattr(name))
- return -EOPNOTSUPP;
- return __ceph_getxattr(inode, name, value, size);
- }
- static int ceph_set_xattr_handler(const struct xattr_handler *handler,
- struct user_namespace *mnt_userns,
- struct dentry *unused, struct inode *inode,
- const char *name, const void *value,
- size_t size, int flags)
- {
- if (!ceph_is_valid_xattr(name))
- return -EOPNOTSUPP;
- return __ceph_setxattr(inode, name, value, size, flags);
- }
- static const struct xattr_handler ceph_other_xattr_handler = {
- .prefix = "", /* match any name => handlers called with full name */
- .get = ceph_get_xattr_handler,
- .set = ceph_set_xattr_handler,
- };
- #ifdef CONFIG_SECURITY
- bool ceph_security_xattr_wanted(struct inode *in)
- {
- return in->i_security != NULL;
- }
- bool ceph_security_xattr_deadlock(struct inode *in)
- {
- struct ceph_inode_info *ci;
- bool ret;
- if (!in->i_security)
- return false;
- ci = ceph_inode(in);
- spin_lock(&ci->i_ceph_lock);
- ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) &&
- !(ci->i_xattrs.version > 0 &&
- __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0));
- spin_unlock(&ci->i_ceph_lock);
- return ret;
- }
- #ifdef CONFIG_CEPH_FS_SECURITY_LABEL
- int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
- struct ceph_acl_sec_ctx *as_ctx)
- {
- struct ceph_pagelist *pagelist = as_ctx->pagelist;
- const char *name;
- size_t name_len;
- int err;
- err = security_dentry_init_security(dentry, mode, &dentry->d_name,
- &name, &as_ctx->sec_ctx,
- &as_ctx->sec_ctxlen);
- if (err < 0) {
- WARN_ON_ONCE(err != -EOPNOTSUPP);
- err = 0; /* do nothing */
- goto out;
- }
- err = -ENOMEM;
- if (!pagelist) {
- pagelist = ceph_pagelist_alloc(GFP_KERNEL);
- if (!pagelist)
- goto out;
- err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
- if (err)
- goto out;
- ceph_pagelist_encode_32(pagelist, 1);
- }
- /*
- * FIXME: Make security_dentry_init_security() generic. Currently
- * It only supports single security module and only selinux has
- * dentry_init_security hook.
- */
- name_len = strlen(name);
- err = ceph_pagelist_reserve(pagelist,
- 4 * 2 + name_len + as_ctx->sec_ctxlen);
- if (err)
- goto out;
- if (as_ctx->pagelist) {
- /* update count of KV pairs */
- BUG_ON(pagelist->length <= sizeof(__le32));
- if (list_is_singular(&pagelist->head)) {
- le32_add_cpu((__le32*)pagelist->mapped_tail, 1);
- } else {
- struct page *page = list_first_entry(&pagelist->head,
- struct page, lru);
- void *addr = kmap_atomic(page);
- le32_add_cpu((__le32*)addr, 1);
- kunmap_atomic(addr);
- }
- } else {
- as_ctx->pagelist = pagelist;
- }
- ceph_pagelist_encode_32(pagelist, name_len);
- ceph_pagelist_append(pagelist, name, name_len);
- ceph_pagelist_encode_32(pagelist, as_ctx->sec_ctxlen);
- ceph_pagelist_append(pagelist, as_ctx->sec_ctx, as_ctx->sec_ctxlen);
- err = 0;
- out:
- if (pagelist && !as_ctx->pagelist)
- ceph_pagelist_release(pagelist);
- return err;
- }
- #endif /* CONFIG_CEPH_FS_SECURITY_LABEL */
- #endif /* CONFIG_SECURITY */
- void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx)
- {
- #ifdef CONFIG_CEPH_FS_POSIX_ACL
- posix_acl_release(as_ctx->acl);
- posix_acl_release(as_ctx->default_acl);
- #endif
- #ifdef CONFIG_CEPH_FS_SECURITY_LABEL
- security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen);
- #endif
- if (as_ctx->pagelist)
- ceph_pagelist_release(as_ctx->pagelist);
- }
- /*
- * List of handlers for synthetic system.* attributes. Other
- * attributes are handled directly.
- */
- const struct xattr_handler *ceph_xattr_handlers[] = {
- #ifdef CONFIG_CEPH_FS_POSIX_ACL
- &posix_acl_access_xattr_handler,
- &posix_acl_default_xattr_handler,
- #endif
- &ceph_other_xattr_handler,
- NULL,
- };
|