* Re: [PATCH 16/16] staging/lustre/llite: extended attribute cache
@ 2013-11-26 2:12 Peng Tao
0 siblings, 0 replies; only message in thread
From: Peng Tao @ 2013-11-26 2:12 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Linux Kernel Mailing List, Andrew Perepechko, Peng Tao, Andreas Dilger
sorry, this is the 16/16 patch and the tile is modified.
"
[PATCH 16/16] staging/lustre/llite: extended attribute cache
"
Thanks,
Tao
On Tue, Nov 26, 2013 at 10:05 AM, Peng Tao <bergwolf@gmail.com> wrote:
> From: Andrew Perepechko <andrew_perepechko@xyratex.com>
>
> This patch implements an extended attribute cache for
> a Lustre client. It is organized as a write-through
> cache: reads are performed from cache, updates are sent
> synchronously to the MDS. An additional inode bit
> MDS_INODELOCK_XATTR is added to protect the cache.
>
> Lustre-change: http://review.whamcloud.com/5537
> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2869
> Signed-off-by: Andrew Perepechko <andrew_perepechko@xyratex.com>
> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
> Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
> Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
> Signed-off-by: Peng Tao <bergwolf@gmail.com>
> Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
> ---
> .../lustre/lustre/include/linux/lustre_lite.h | 1 +
> .../lustre/lustre/include/lustre/lustre_idl.h | 12 +-
> .../lustre/lustre/include/lustre_req_layout.h | 3 +
> drivers/staging/lustre/lustre/include/md_object.h | 4 +-
> drivers/staging/lustre/lustre/include/obd.h | 5 +
> .../staging/lustre/lustre/include/obd_support.h | 1 +
> drivers/staging/lustre/lustre/ldlm/ldlm_lock.c | 2 +
> drivers/staging/lustre/lustre/llite/Makefile | 2 +-
> drivers/staging/lustre/lustre/llite/file.c | 13 +-
> .../staging/lustre/lustre/llite/llite_internal.h | 36 +-
> drivers/staging/lustre/lustre/llite/llite_lib.c | 23 +-
> drivers/staging/lustre/lustre/llite/lproc_llite.c | 37 ++
> drivers/staging/lustre/lustre/llite/namei.c | 4 +
> drivers/staging/lustre/lustre/llite/super25.c | 4 +
> drivers/staging/lustre/lustre/llite/xattr.c | 102 ++--
> drivers/staging/lustre/lustre/llite/xattr_cache.c | 640 ++++++++++++++++++++
> drivers/staging/lustre/lustre/mdc/mdc_internal.h | 1 +
> drivers/staging/lustre/lustre/mdc/mdc_locks.c | 63 +-
> drivers/staging/lustre/lustre/ptlrpc/layout.c | 34 ++
> 19 files changed, 925 insertions(+), 62 deletions(-)
> create mode 100644 drivers/staging/lustre/lustre/llite/xattr_cache.c
>
> diff --git a/drivers/staging/lustre/lustre/include/linux/lustre_lite.h b/drivers/staging/lustre/lustre/include/linux/lustre_lite.h
> index 9e5df8d..df93912 100644
> --- a/drivers/staging/lustre/lustre/include/linux/lustre_lite.h
> +++ b/drivers/staging/lustre/lustre/include/linux/lustre_lite.h
> @@ -88,6 +88,7 @@ enum {
> LPROC_LL_ALLOC_INODE,
> LPROC_LL_SETXATTR,
> LPROC_LL_GETXATTR,
> + LPROC_LL_GETXATTR_HITS,
> LPROC_LL_LISTXATTR,
> LPROC_LL_REMOVEXATTR,
> LPROC_LL_INODE_PERM,
> diff --git a/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h b/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
> index c173bba..500f5d2 100644
> --- a/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
> +++ b/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
> @@ -1369,7 +1369,7 @@ extern void lustre_swab_ptlrpc_body(struct ptlrpc_body *pb);
> OBD_CONNECT_EINPROGRESS | \
> OBD_CONNECT_LIGHTWEIGHT | OBD_CONNECT_UMASK | \
> OBD_CONNECT_LVB_TYPE | OBD_CONNECT_LAYOUTLOCK |\
> - OBD_CONNECT_PINGLESS)
> + OBD_CONNECT_PINGLESS | OBD_CONNECT_MAX_EASIZE)
> #define OST_CONNECT_SUPPORTED (OBD_CONNECT_SRVLOCK | OBD_CONNECT_GRANT | \
> OBD_CONNECT_REQPORTAL | OBD_CONNECT_VERSION | \
> OBD_CONNECT_TRUNCLOCK | OBD_CONNECT_INDEX | \
> @@ -1753,7 +1753,9 @@ static inline __u32 lov_mds_md_size(__u16 stripes, __u32 lmm_magic)
> #define OBD_MD_FLCKSPLIT (0x0000080000000000ULL) /* Check split on server */
> #define OBD_MD_FLCROSSREF (0x0000100000000000ULL) /* Cross-ref case */
> #define OBD_MD_FLGETATTRLOCK (0x0000200000000000ULL) /* Get IOEpoch attributes
> - * under lock */
> + * under lock; for xattr
> + * requests means the
> + * client holds the lock */
> #define OBD_MD_FLOBJCOUNT (0x0000400000000000ULL) /* for multiple destroy */
>
> #define OBD_MD_FLRMTLSETFACL (0x0001000000000000ULL) /* lfs lsetfacl case */
> @@ -1770,6 +1772,9 @@ static inline __u32 lov_mds_md_size(__u16 stripes, __u32 lmm_magic)
> OBD_MD_FLGID | OBD_MD_FLFLAGS | OBD_MD_FLNLINK | \
> OBD_MD_FLGENER | OBD_MD_FLRDEV | OBD_MD_FLGROUP)
>
> +#define OBD_MD_FLXATTRLOCKED OBD_MD_FLGETATTRLOCK
> +#define OBD_MD_FLXATTRALL (OBD_MD_FLXATTR | OBD_MD_FLXATTRLS)
> +
> /* don't forget obdo_fid which is way down at the bottom so it can
> * come after the definition of llog_cookie */
>
> @@ -2142,8 +2147,9 @@ extern void lustre_swab_generic_32s (__u32 *val);
> #define MDS_INODELOCK_OPEN 0x000004 /* For opened files */
> #define MDS_INODELOCK_LAYOUT 0x000008 /* for layout */
> #define MDS_INODELOCK_PERM 0x000010 /* for permission */
> +#define MDS_INODELOCK_XATTR 0x000020 /* extended attributes */
>
> -#define MDS_INODELOCK_MAXSHIFT 4
> +#define MDS_INODELOCK_MAXSHIFT 5
> /* This FULL lock is useful to take on unlink sort of operations */
> #define MDS_INODELOCK_FULL ((1<<(MDS_INODELOCK_MAXSHIFT+1))-1)
>
> diff --git a/drivers/staging/lustre/lustre/include/lustre_req_layout.h b/drivers/staging/lustre/lustre/include/lustre_req_layout.h
> index a75f4c6..a83db61 100644
> --- a/drivers/staging/lustre/lustre/include/lustre_req_layout.h
> +++ b/drivers/staging/lustre/lustre/include/lustre_req_layout.h
> @@ -230,6 +230,7 @@ extern struct req_format RQF_LDLM_INTENT_GETATTR;
> extern struct req_format RQF_LDLM_INTENT_OPEN;
> extern struct req_format RQF_LDLM_INTENT_CREATE;
> extern struct req_format RQF_LDLM_INTENT_UNLINK;
> +extern struct req_format RQF_LDLM_INTENT_GETXATTR;
> extern struct req_format RQF_LDLM_INTENT_QUOTA;
> extern struct req_format RQF_LDLM_CANCEL;
> extern struct req_format RQF_LDLM_CALLBACK;
> @@ -279,6 +280,8 @@ extern struct req_msg_field RMF_LAYOUT_INTENT;
> extern struct req_msg_field RMF_MDT_MD;
> extern struct req_msg_field RMF_REC_REINT;
> extern struct req_msg_field RMF_EADATA;
> +extern struct req_msg_field RMF_EAVALS;
> +extern struct req_msg_field RMF_EAVALS_LENS;
> extern struct req_msg_field RMF_ACL;
> extern struct req_msg_field RMF_LOGCOOKIES;
> extern struct req_msg_field RMF_CAPA1;
> diff --git a/drivers/staging/lustre/lustre/include/md_object.h b/drivers/staging/lustre/lustre/include/md_object.h
> index daf93af..7b45b47 100644
> --- a/drivers/staging/lustre/lustre/include/md_object.h
> +++ b/drivers/staging/lustre/lustre/include/md_object.h
> @@ -352,8 +352,8 @@ struct md_device_operations {
> int (*mdo_root_get)(const struct lu_env *env, struct md_device *m,
> struct lu_fid *f);
>
> - int (*mdo_maxsize_get)(const struct lu_env *env, struct md_device *m,
> - int *md_size, int *cookie_size);
> + int (*mdo_maxeasize_get)(const struct lu_env *env, struct md_device *m,
> + int *easize);
>
> int (*mdo_statfs)(const struct lu_env *env, struct md_device *m,
> struct obd_statfs *sfs);
> diff --git a/drivers/staging/lustre/lustre/include/obd.h b/drivers/staging/lustre/lustre/include/obd.h
> index 3247d1d..c3470ce 100644
> --- a/drivers/staging/lustre/lustre/include/obd.h
> +++ b/drivers/staging/lustre/lustre/include/obd.h
> @@ -1022,6 +1022,7 @@ struct lu_context;
> #define IT_LAYOUT (1 << 10)
> #define IT_QUOTA_DQACQ (1 << 11)
> #define IT_QUOTA_CONN (1 << 12)
> +#define IT_SETXATTR (1 << 13)
>
> static inline int it_to_lock_mode(struct lookup_intent *it)
> {
> @@ -1031,6 +1032,10 @@ static inline int it_to_lock_mode(struct lookup_intent *it)
> else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_LOOKUP |
> IT_LAYOUT))
> return LCK_CR;
> + else if (it->it_op & IT_GETXATTR)
> + return LCK_PR;
> + else if (it->it_op & IT_SETXATTR)
> + return LCK_PW;
>
> LASSERTF(0, "Invalid it_op: %d\n", it->it_op);
> return -EINVAL;
> diff --git a/drivers/staging/lustre/lustre/include/obd_support.h b/drivers/staging/lustre/lustre/include/obd_support.h
> index 4d1f62c..36bdeab 100644
> --- a/drivers/staging/lustre/lustre/include/obd_support.h
> +++ b/drivers/staging/lustre/lustre/include/obd_support.h
> @@ -466,6 +466,7 @@ int obd_alloc_fail(const void *ptr, const char *name, const char *type,
> #define OBD_FAIL_LOCK_STATE_WAIT_INTR 0x1402
> #define OBD_FAIL_LOV_INIT 0x1403
> #define OBD_FAIL_GLIMPSE_DELAY 0x1404
> +#define OBD_FAIL_LLITE_XATTR_ENOMEM 0x1405
>
> #define OBD_FAIL_FID_INDIR 0x1501
> #define OBD_FAIL_FID_INLMA 0x1502
> diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c b/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
> index ef826e9..95eff79 100644
> --- a/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
> +++ b/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
> @@ -145,6 +145,8 @@ char *ldlm_it2str(int it)
> return "getxattr";
> case IT_LAYOUT:
> return "layout";
> + case IT_SETXATTR:
> + return "setxattr";
> default:
> CERROR("Unknown intent %d\n", it);
> return "UNKNOWN";
> diff --git a/drivers/staging/lustre/lustre/llite/Makefile b/drivers/staging/lustre/lustre/llite/Makefile
> index f493e07..bb34b8b 100644
> --- a/drivers/staging/lustre/lustre/llite/Makefile
> +++ b/drivers/staging/lustre/lustre/llite/Makefile
> @@ -2,7 +2,7 @@ obj-$(CONFIG_LUSTRE_FS) += lustre.o
> obj-$(CONFIG_LUSTRE_LLITE_LLOOP) += llite_lloop.o
> lustre-y := dcache.o dir.o file.o llite_close.o llite_lib.o llite_nfs.o \
> rw.o lproc_llite.o namei.o symlink.o llite_mmap.o \
> - xattr.o remote_perm.o llite_rmtacl.o llite_capa.o \
> + xattr.o xattr_cache.o remote_perm.o llite_rmtacl.o llite_capa.o \
> rw26.o super25.o statahead.o \
> ../lclient/glimpse.o ../lclient/lcommon_cl.o ../lclient/lcommon_misc.o \
> vvp_dev.o vvp_page.o vvp_lock.o vvp_io.o vvp_object.o
> diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
> index 7a93936..1423da2 100644
> --- a/drivers/staging/lustre/lustre/llite/file.c
> +++ b/drivers/staging/lustre/lustre/llite/file.c
> @@ -2783,7 +2783,8 @@ int ll_have_md_lock(struct inode *inode, __u64 *bits, ldlm_mode_t l_req_mode)
> }
>
> ldlm_mode_t ll_take_md_lock(struct inode *inode, __u64 bits,
> - struct lustre_handle *lockh, __u64 flags)
> + struct lustre_handle *lockh, __u64 flags,
> + ldlm_mode_t mode)
> {
> ldlm_policy_data_t policy = { .l_inodebits = {bits}};
> struct lu_fid *fid;
> @@ -2793,8 +2794,8 @@ ldlm_mode_t ll_take_md_lock(struct inode *inode, __u64 bits,
> CDEBUG(D_INFO, "trying to match res "DFID"\n", PFID(fid));
>
> rc = md_lock_match(ll_i2mdexp(inode), LDLM_FL_BLOCK_GRANTED|flags,
> - fid, LDLM_IBITS, &policy,
> - LCK_CR|LCK_CW|LCK_PR|LCK_PW, lockh);
> + fid, LDLM_IBITS, &policy, mode, lockh);
> +
> return rc;
> }
>
> @@ -3470,7 +3471,8 @@ int ll_layout_refresh(struct inode *inode, __u32 *gen)
>
> /* mostly layout lock is caching on the local side, so try to match
> * it before grabbing layout lock mutex. */
> - mode = ll_take_md_lock(inode, MDS_INODELOCK_LAYOUT, &lockh, 0);
> + mode = ll_take_md_lock(inode, MDS_INODELOCK_LAYOUT, &lockh, 0,
> + LCK_CR | LCK_CW | LCK_PR | LCK_PW);
> if (mode != 0) { /* hit cached lock */
> rc = ll_layout_lock_set(&lockh, mode, inode, gen, false);
> if (rc == 0)
> @@ -3485,7 +3487,8 @@ int ll_layout_refresh(struct inode *inode, __u32 *gen)
>
> again:
> /* try again. Maybe somebody else has done this. */
> - mode = ll_take_md_lock(inode, MDS_INODELOCK_LAYOUT, &lockh, 0);
> + mode = ll_take_md_lock(inode, MDS_INODELOCK_LAYOUT, &lockh, 0,
> + LCK_CR | LCK_CW | LCK_PR | LCK_PW);
> if (mode != 0) { /* hit cached lock */
> rc = ll_layout_lock_set(&lockh, mode, inode, gen, true);
> if (rc == -EAGAIN)
> diff --git a/drivers/staging/lustre/lustre/llite/llite_internal.h b/drivers/staging/lustre/lustre/llite/llite_internal.h
> index e479a69..1355de4 100644
> --- a/drivers/staging/lustre/lustre/llite/llite_internal.h
> +++ b/drivers/staging/lustre/lustre/llite/llite_internal.h
> @@ -127,6 +127,8 @@ enum lli_flags {
> LLIF_DATA_MODIFIED = (1 << 6),
> /* File is being restored */
> LLIF_FILE_RESTORING = (1 << 7),
> + /* Xattr cache is attached to the file */
> + LLIF_XATTR_CACHE = (1 << 8),
> };
>
> struct ll_inode_info {
> @@ -279,8 +281,27 @@ struct ll_inode_info {
> struct mutex lli_layout_mutex;
> /* valid only inside LAYOUT ibits lock, protected by lli_layout_mutex */
> __u32 lli_layout_gen;
> +
> + struct rw_semaphore lli_xattrs_list_rwsem;
> + struct mutex lli_xattrs_enq_lock;
> + struct list_head lli_xattrs;/* ll_xattr_entry->xe_list */
> };
>
> +int ll_xattr_cache_destroy(struct inode *inode);
> +
> +int ll_xattr_cache_get(struct inode *inode,
> + const char *name,
> + char *buffer,
> + size_t size,
> + __u64 valid);
> +
> +int ll_xattr_cache_update(struct inode *inode,
> + const char *name,
> + const char *newval,
> + size_t size,
> + __u64 valid,
> + int flags);
> +
> /*
> * Locking to guarantee consistency of non-atomic updates to long long i_size,
> * consistency between file size and KMS.
> @@ -402,6 +423,7 @@ enum stats_track_type {
> #define LL_SBI_VERBOSE 0x10000 /* verbose mount/umount */
> #define LL_SBI_LAYOUT_LOCK 0x20000 /* layout lock support */
> #define LL_SBI_USER_FID2PATH 0x40000 /* allow fid2path by unprivileged users */
> +#define LL_SBI_XATTR_CACHE 0x80000 /* support for xattr cache */
>
> #define LL_SBI_FLAGS { \
> "nolck", \
> @@ -409,6 +431,7 @@ enum stats_track_type {
> "flock", \
> "xattr", \
> "acl", \
> + "???", \
> "rmt_client", \
> "mds_capa", \
> "oss_capa", \
> @@ -421,7 +444,9 @@ enum stats_track_type {
> "agl", \
> "verbose", \
> "layout", \
> - "user_fid2path" }
> + "user_fid2path",\
> + "xattr", \
> +}
>
> /* default value for ll_sb_info->contention_time */
> #define SBI_DEFAULT_CONTENTION_SECONDS 60
> @@ -461,7 +486,8 @@ struct ll_sb_info {
> struct lu_fid ll_root_fid; /* root object fid */
>
> int ll_flags;
> - unsigned int ll_umounting:1;
> + unsigned int ll_umounting:1,
> + ll_xattr_cache_enabled:1;
> struct list_head ll_conn_chain; /* per-conn chain of SBs */
> struct lustre_client_ocd ll_lco;
>
> @@ -732,7 +758,8 @@ extern int ll_inode_revalidate_it(struct dentry *, struct lookup_intent *,
> extern int ll_have_md_lock(struct inode *inode, __u64 *bits,
> ldlm_mode_t l_req_mode);
> extern ldlm_mode_t ll_take_md_lock(struct inode *inode, __u64 bits,
> - struct lustre_handle *lockh, __u64 flags);
> + struct lustre_handle *lockh, __u64 flags,
> + ldlm_mode_t mode);
> int __ll_inode_revalidate_it(struct dentry *, struct lookup_intent *,
> __u64 bits);
> int ll_revalidate_nd(struct dentry *dentry, unsigned int flags);
> @@ -1598,4 +1625,7 @@ int ll_layout_conf(struct inode *inode, const struct cl_object_conf *conf);
> int ll_layout_refresh(struct inode *inode, __u32 *gen);
> int ll_layout_restore(struct inode *inode);
>
> +int ll_xattr_init(void);
> +void ll_xattr_fini(void);
> +
> #endif /* LLITE_INTERNAL_H */
> diff --git a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c
> index facc391..154bdb2 100644
> --- a/drivers/staging/lustre/lustre/llite/llite_lib.c
> +++ b/drivers/staging/lustre/lustre/llite/llite_lib.c
> @@ -209,7 +209,8 @@ static int client_common_fill_super(struct super_block *sb, char *md, char *dt,
> OBD_CONNECT_FULL20 | OBD_CONNECT_64BITHASH|
> OBD_CONNECT_EINPROGRESS |
> OBD_CONNECT_JOBSTATS | OBD_CONNECT_LVB_TYPE |
> - OBD_CONNECT_LAYOUTLOCK | OBD_CONNECT_PINGLESS;
> + OBD_CONNECT_LAYOUTLOCK |
> + OBD_CONNECT_PINGLESS | OBD_CONNECT_MAX_EASIZE;
>
> if (sbi->ll_flags & LL_SBI_SOM_PREVIEW)
> data->ocd_connect_flags |= OBD_CONNECT_SOM;
> @@ -383,6 +384,17 @@ static int client_common_fill_super(struct super_block *sb, char *md, char *dt,
> sbi->ll_flags |= LL_SBI_LAYOUT_LOCK;
> }
>
> + if (data->ocd_ibits_known & MDS_INODELOCK_XATTR) {
> + if (!(data->ocd_connect_flags & OBD_CONNECT_MAX_EASIZE)) {
> + LCONSOLE_INFO(
> + "%s: disabling xattr cache due to unknown maximum xattr size.\n",
> + dt);
> + } else {
> + sbi->ll_flags |= LL_SBI_XATTR_CACHE;
> + sbi->ll_xattr_cache_enabled = 1;
> + }
> + }
> +
> obd = class_name2obd(dt);
> if (!obd) {
> CERROR("DT %s: not setup or attached\n", dt);
> @@ -922,6 +934,9 @@ void ll_lli_init(struct ll_inode_info *lli)
> lli->lli_layout_gen = LL_LAYOUT_GEN_NONE;
> lli->lli_clob = NULL;
>
> + init_rwsem(&lli->lli_xattrs_list_rwsem);
> + mutex_init(&lli->lli_xattrs_enq_lock);
> +
> LASSERT(lli->lli_vfs_inode.i_mode != 0);
> if (S_ISDIR(lli->lli_vfs_inode.i_mode)) {
> mutex_init(&lli->lli_readdir_mutex);
> @@ -1194,6 +1209,8 @@ void ll_clear_inode(struct inode *inode)
> lli->lli_symlink_name = NULL;
> }
>
> + ll_xattr_cache_destroy(inode);
> +
> if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
> LASSERT(lli->lli_posix_acl == NULL);
> if (lli->lli_remote_perms) {
> @@ -1752,7 +1769,9 @@ void ll_update_inode(struct inode *inode, struct lustre_md *md)
> * lock on the client and set LLIF_MDS_SIZE_LOCK holding
> * it. */
> mode = ll_take_md_lock(inode, MDS_INODELOCK_UPDATE,
> - &lockh, LDLM_FL_CBPENDING);
> + &lockh, LDLM_FL_CBPENDING,
> + LCK_CR | LCK_CW |
> + LCK_PR | LCK_PW);
> if (mode) {
> if (lli->lli_flags & (LLIF_DONE_WRITING |
> LLIF_EPOCH_PENDING |
> diff --git a/drivers/staging/lustre/lustre/llite/lproc_llite.c b/drivers/staging/lustre/lustre/llite/lproc_llite.c
> index 4bf09c4..1ded16a 100644
> --- a/drivers/staging/lustre/lustre/llite/lproc_llite.c
> +++ b/drivers/staging/lustre/lustre/llite/lproc_llite.c
> @@ -723,6 +723,41 @@ static int ll_sbi_flags_seq_show(struct seq_file *m, void *v)
> }
> LPROC_SEQ_FOPS_RO(ll_sbi_flags);
>
> +static int ll_xattr_cache_seq_show(struct seq_file *m, void *v)
> +{
> + struct super_block *sb = m->private;
> + struct ll_sb_info *sbi = ll_s2sbi(sb);
> + int rc;
> +
> + rc = seq_printf(m, "%u\n", sbi->ll_xattr_cache_enabled);
> +
> + return rc;
> +}
> +
> +static ssize_t ll_xattr_cache_seq_write(struct file *file, const char *buffer,
> + size_t count, loff_t *off)
> +{
> + struct seq_file *seq = file->private_data;
> + struct super_block *sb = seq->private;
> + struct ll_sb_info *sbi = ll_s2sbi(sb);
> + int val, rc;
> +
> + rc = lprocfs_write_helper(buffer, count, &val);
> + if (rc)
> + return rc;
> +
> + if (val != 0 && val != 1)
> + return -ERANGE;
> +
> + if (val == 1 && !(sbi->ll_flags & LL_SBI_XATTR_CACHE))
> + return -ENOTSUPP;
> +
> + sbi->ll_xattr_cache_enabled = val;
> +
> + return count;
> +}
> +LPROC_SEQ_FOPS(ll_xattr_cache);
> +
> static struct lprocfs_vars lprocfs_llite_obd_vars[] = {
> { "uuid", &ll_sb_uuid_fops, 0, 0 },
> //{ "mntpt_path", ll_rd_path, 0, 0 },
> @@ -751,6 +786,7 @@ static struct lprocfs_vars lprocfs_llite_obd_vars[] = {
> { "lazystatfs", &ll_lazystatfs_fops, 0 },
> { "max_easize", &ll_maxea_size_fops, 0, 0 },
> { "sbi_flags", &ll_sbi_flags_fops, 0, 0 },
> + { "xattr_cache", &ll_xattr_cache_fops, 0, 0 },
> { 0 }
> };
>
> @@ -802,6 +838,7 @@ struct llite_file_opcode {
> { LPROC_LL_ALLOC_INODE, LPROCFS_TYPE_REGS, "alloc_inode" },
> { LPROC_LL_SETXATTR, LPROCFS_TYPE_REGS, "setxattr" },
> { LPROC_LL_GETXATTR, LPROCFS_TYPE_REGS, "getxattr" },
> + { LPROC_LL_GETXATTR_HITS, LPROCFS_TYPE_REGS, "getxattr_hits" },
> { LPROC_LL_LISTXATTR, LPROCFS_TYPE_REGS, "listxattr" },
> { LPROC_LL_REMOVEXATTR, LPROCFS_TYPE_REGS, "removexattr" },
> { LPROC_LL_INODE_PERM, LPROCFS_TYPE_REGS, "inode_permission" },
> diff --git a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c
> index 0000530..dfcfbb8 100644
> --- a/drivers/staging/lustre/lustre/llite/namei.c
> +++ b/drivers/staging/lustre/lustre/llite/namei.c
> @@ -222,6 +222,10 @@ int ll_md_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
> break;
>
> LASSERT(lock->l_flags & LDLM_FL_CANCELING);
> +
> + if (bits & MDS_INODELOCK_XATTR)
> + ll_xattr_cache_destroy(inode);
> +
> /* For OPEN locks we differentiate between lock modes
> * LCK_CR, LCK_CW, LCK_PR - bug 22891 */
> if (bits & (MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
> diff --git a/drivers/staging/lustre/lustre/llite/super25.c b/drivers/staging/lustre/lustre/llite/super25.c
> index 0beaf4e..e21e1c7 100644
> --- a/drivers/staging/lustre/lustre/llite/super25.c
> +++ b/drivers/staging/lustre/lustre/llite/super25.c
> @@ -187,11 +187,15 @@ static int __init init_lustre_lite(void)
> if (rc == 0)
> rc = vvp_global_init();
>
> + if (rc == 0)
> + rc = ll_xattr_init();
> +
> return rc;
> }
>
> static void __exit exit_lustre_lite(void)
> {
> + ll_xattr_fini();
> vvp_global_fini();
> del_timer(&ll_capa_timer);
> ll_capa_thread_stop();
> diff --git a/drivers/staging/lustre/lustre/llite/xattr.c b/drivers/staging/lustre/lustre/llite/xattr.c
> index bcf86ba..ee95855 100644
> --- a/drivers/staging/lustre/lustre/llite/xattr.c
> +++ b/drivers/staging/lustre/lustre/llite/xattr.c
> @@ -109,7 +109,7 @@ int ll_setxattr_common(struct inode *inode, const char *name,
> int flags, __u64 valid)
> {
> struct ll_sb_info *sbi = ll_i2sbi(inode);
> - struct ptlrpc_request *req;
> + struct ptlrpc_request *req = NULL;
> int xattr_type, rc;
> struct obd_capa *oc;
> #ifdef CONFIG_FS_POSIX_ACL
> @@ -183,11 +183,17 @@ int ll_setxattr_common(struct inode *inode, const char *name,
> valid |= rce_ops2valid(rce->rce_ops);
> }
> #endif
> - oc = ll_mdscapa_get(inode);
> - rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
> - valid, name, pv, size, 0, flags, ll_i2suppgid(inode),
> - &req);
> - capa_put(oc);
> + if (sbi->ll_xattr_cache_enabled &&
> + (rce == NULL || rce->rce_ops == RMT_LSETFACL)) {
> + rc = ll_xattr_cache_update(inode, name, pv, size, valid, flags);
> + } else {
> + oc = ll_mdscapa_get(inode);
> + rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
> + valid, name, pv, size, 0, flags,
> + ll_i2suppgid(inode), &req);
> + capa_put(oc);
> + }
> +
> #ifdef CONFIG_FS_POSIX_ACL
> if (new_value != NULL)
> lustre_posix_acl_xattr_free(new_value, size);
> @@ -352,48 +358,54 @@ int ll_getxattr_common(struct inode *inode, const char *name,
> #endif
>
> do_getxattr:
> - oc = ll_mdscapa_get(inode);
> - rc = md_getxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
> - valid | (rce ? rce_ops2valid(rce->rce_ops) : 0),
> - name, NULL, 0, size, 0, &req);
> - capa_put(oc);
> - if (rc) {
> - if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
> - LCONSOLE_INFO("Disabling user_xattr feature because "
> - "it is not supported on the server\n");
> - sbi->ll_flags &= ~LL_SBI_USER_XATTR;
> - }
> - return rc;
> - }
> + if (sbi->ll_xattr_cache_enabled && (rce == NULL ||
> + rce->rce_ops == RMT_LGETFACL ||
> + rce->rce_ops == RMT_LSETFACL)) {
> + rc = ll_xattr_cache_get(inode, name, buffer, size, valid);
> + if (rc < 0)
> + GOTO(out_xattr, rc);
> + } else {
> + oc = ll_mdscapa_get(inode);
> + rc = md_getxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
> + valid | (rce ? rce_ops2valid(rce->rce_ops) : 0),
> + name, NULL, 0, size, 0, &req);
> + capa_put(oc);
>
> - body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
> - LASSERT(body);
> + if (rc < 0)
> + GOTO(out_xattr, rc);
>
> - /* only detect the xattr size */
> - if (size == 0)
> - GOTO(out, rc = body->eadatasize);
> + body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
> + LASSERT(body);
>
> - if (size < body->eadatasize) {
> - CERROR("server bug: replied size %u > %u\n",
> - body->eadatasize, (int)size);
> - GOTO(out, rc = -ERANGE);
> - }
> + /* only detect the xattr size */
> + if (size == 0)
> + GOTO(out, rc = body->eadatasize);
>
> - if (body->eadatasize == 0)
> - GOTO(out, rc = -ENODATA);
> + if (size < body->eadatasize) {
> + CERROR("server bug: replied size %u > %u\n",
> + body->eadatasize, (int)size);
> + GOTO(out, rc = -ERANGE);
> + }
> +
> + if (body->eadatasize == 0)
> + GOTO(out, rc = -ENODATA);
>
> - /* do not need swab xattr data */
> - xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
> - body->eadatasize);
> - if (!xdata)
> - GOTO(out, rc = -EFAULT);
> + /* do not need swab xattr data */
> + xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
> + body->eadatasize);
> + if (!xdata)
> + GOTO(out, rc = -EFAULT);
> +
> + memcpy(buffer, xdata, body->eadatasize);
> + rc = body->eadatasize;
> + }
>
> #ifdef CONFIG_FS_POSIX_ACL
> - if (body->eadatasize >= 0 && rce && rce->rce_ops == RMT_LSETFACL) {
> + if (rce && rce->rce_ops == RMT_LSETFACL) {
> ext_acl_xattr_header *acl;
>
> - acl = lustre_posix_acl_xattr_2ext((posix_acl_xattr_header *)xdata,
> - body->eadatasize);
> + acl = lustre_posix_acl_xattr_2ext(
> + (posix_acl_xattr_header *)buffer, rc);
> if (IS_ERR(acl))
> GOTO(out, rc = PTR_ERR(acl));
>
> @@ -406,12 +418,12 @@ do_getxattr:
> }
> #endif
>
> - if (body->eadatasize == 0) {
> - rc = -ENODATA;
> - } else {
> - LASSERT(buffer);
> - memcpy(buffer, xdata, body->eadatasize);
> - rc = body->eadatasize;
> +out_xattr:
> + if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
> + LCONSOLE_INFO(
> + "%s: disabling user_xattr feature because it is not supported on the server: rc = %d\n",
> + ll_get_fsname(inode->i_sb, NULL, 0), rc);
> + sbi->ll_flags &= ~LL_SBI_USER_XATTR;
> }
> out:
> ptlrpc_req_finished(req);
> diff --git a/drivers/staging/lustre/lustre/llite/xattr_cache.c b/drivers/staging/lustre/lustre/llite/xattr_cache.c
> new file mode 100644
> index 0000000..4bd544a
> --- /dev/null
> +++ b/drivers/staging/lustre/lustre/llite/xattr_cache.c
> @@ -0,0 +1,640 @@
> +/* GPL HEADER START
> + *
> + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 only,
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * General Public License version 2 for more details (a copy is included
> + * in the LICENSE file that accompanied this code).
> + *
> + * You should have received a copy of the GNU General Public License
> + * version 2 along with this program; If not, see http://www.gnu.org/licenses
> + *
> + * Please visit http://www.xyratex.com/contact if you need additional
> + * information or have any questions.
> + *
> + * GPL HEADER END
> + */
> +
> +/*
> + * Copyright 2012 Xyratex Technology Limited
> + *
> + * Author: Andrew Perepechko <Andrew_Perepechko@xyratex.com>
> + *
> + */
> +
> +#define DEBUG_SUBSYSTEM S_LLITE
> +
> +#include <linux/fs.h>
> +#include <linux/sched.h>
> +#include <linux/mm.h>
> +#include <obd_support.h>
> +#include <lustre_lite.h>
> +#include <lustre_dlm.h>
> +#include <lustre_ver.h>
> +#include "llite_internal.h"
> +
> +/* If we ever have hundreds of extended attributes, we might want to consider
> + * using a hash or a tree structure instead of list for faster lookups.
> + */
> +struct ll_xattr_entry {
> + struct list_head xe_list; /* protected with
> + * lli_xattrs_list_rwsem */
> + char *xe_name; /* xattr name, \0-terminated */
> + char *xe_value; /* xattr value */
> + unsigned xe_namelen; /* strlen(xe_name) + 1 */
> + unsigned xe_vallen; /* xattr value length */
> +};
> +
> +static struct kmem_cache *xattr_kmem;
> +static struct lu_kmem_descr xattr_caches[] = {
> + {
> + .ckd_cache = &xattr_kmem,
> + .ckd_name = "xattr_kmem",
> + .ckd_size = sizeof(struct ll_xattr_entry)
> + },
> + {
> + .ckd_cache = NULL
> + }
> +};
> +
> +int ll_xattr_init(void)
> +{
> + return lu_kmem_init(xattr_caches);
> +}
> +
> +void ll_xattr_fini(void)
> +{
> + lu_kmem_fini(xattr_caches);
> +}
> +
> +/**
> + * Initializes xattr cache for an inode.
> + *
> + * This initializes the xattr list and marks cache presence.
> + */
> +static void ll_xattr_cache_init(struct ll_inode_info *lli)
> +{
> +
> +
> + LASSERT(lli != NULL);
> +
> + INIT_LIST_HEAD(&lli->lli_xattrs);
> + lli->lli_flags |= LLIF_XATTR_CACHE;
> +}
> +
> +/**
> + * This looks for a specific extended attribute.
> + *
> + * Find in @cache and return @xattr_name attribute in @xattr,
> + * for the NULL @xattr_name return the first cached @xattr.
> + *
> + * \retval 0 success
> + * \retval -ENODATA if not found
> + */
> +static int ll_xattr_cache_find(struct list_head *cache,
> + const char *xattr_name,
> + struct ll_xattr_entry **xattr)
> +{
> + struct ll_xattr_entry *entry;
> +
> +
> +
> + list_for_each_entry(entry, cache, xe_list) {
> + /* xattr_name == NULL means look for any entry */
> + if (xattr_name == NULL ||
> + strcmp(xattr_name, entry->xe_name) == 0) {
> + *xattr = entry;
> + CDEBUG(D_CACHE, "find: [%s]=%.*s\n",
> + entry->xe_name, entry->xe_vallen,
> + entry->xe_value);
> + return 0;
> + }
> + }
> +
> + return -ENODATA;
> +}
> +
> +/**
> + * This adds or updates an xattr.
> + *
> + * Add @xattr_name attr with @xattr_val value and @xattr_val_len length,
> + * if the attribute already exists, then update its value.
> + *
> + * \retval 0 success
> + * \retval -ENOMEM if no memory could be allocated for the cached attr
> + */
> +static int ll_xattr_cache_add(struct list_head *cache,
> + const char *xattr_name,
> + const char *xattr_val,
> + unsigned xattr_val_len)
> +{
> + struct ll_xattr_entry *xattr;
> +
> +
> +
> + if (ll_xattr_cache_find(cache, xattr_name, &xattr) == 0) {
> + /* Found a cached EA, update it */
> +
> + if (xattr_val_len != xattr->xe_vallen) {
> + char *val;
> + OBD_ALLOC(val, xattr_val_len);
> + if (val == NULL) {
> + CDEBUG(D_CACHE,
> + "failed to allocate %u bytes for xattr %s update\n",
> + xattr_val_len, xattr_name);
> + return -ENOMEM;
> + }
> + OBD_FREE(xattr->xe_value, xattr->xe_vallen);
> + xattr->xe_value = val;
> + xattr->xe_vallen = xattr_val_len;
> + }
> + memcpy(xattr->xe_value, xattr_val, xattr_val_len);
> +
> + CDEBUG(D_CACHE, "update: [%s]=%.*s\n", xattr_name,
> + xattr_val_len, xattr_val);
> +
> + return 0;
> + }
> +
> + OBD_SLAB_ALLOC_PTR_GFP(xattr, xattr_kmem, __GFP_IO);
> + if (xattr == NULL) {
> + CDEBUG(D_CACHE, "failed to allocate xattr\n");
> + return -ENOMEM;
> + }
> +
> + xattr->xe_namelen = strlen(xattr_name) + 1;
> +
> + OBD_ALLOC(xattr->xe_name, xattr->xe_namelen);
> + if (!xattr->xe_name) {
> + CDEBUG(D_CACHE, "failed to alloc xattr name %u\n",
> + xattr->xe_namelen);
> + goto err_name;
> + }
> + OBD_ALLOC(xattr->xe_value, xattr_val_len);
> + if (!xattr->xe_value) {
> + CDEBUG(D_CACHE, "failed to alloc xattr value %d\n",
> + xattr_val_len);
> + goto err_value;
> + }
> +
> + memcpy(xattr->xe_name, xattr_name, xattr->xe_namelen);
> + memcpy(xattr->xe_value, xattr_val, xattr_val_len);
> + xattr->xe_vallen = xattr_val_len;
> + list_add(&xattr->xe_list, cache);
> +
> + CDEBUG(D_CACHE, "set: [%s]=%.*s\n", xattr_name,
> + xattr_val_len, xattr_val);
> +
> + return 0;
> +err_value:
> + OBD_FREE(xattr->xe_name, xattr->xe_namelen);
> +err_name:
> + OBD_SLAB_FREE_PTR(xattr, xattr_kmem);
> +
> + return -ENOMEM;
> +}
> +
> +/**
> + * This removes an extended attribute from cache.
> + *
> + * Remove @xattr_name attribute from @cache.
> + *
> + * \retval 0 success
> + * \retval -ENODATA if @xattr_name is not cached
> + */
> +static int ll_xattr_cache_del(struct list_head *cache,
> + const char *xattr_name)
> +{
> + struct ll_xattr_entry *xattr;
> +
> +
> +
> + CDEBUG(D_CACHE, "del xattr: %s\n", xattr_name);
> +
> + if (ll_xattr_cache_find(cache, xattr_name, &xattr) == 0) {
> + list_del(&xattr->xe_list);
> + OBD_FREE(xattr->xe_name, xattr->xe_namelen);
> + OBD_FREE(xattr->xe_value, xattr->xe_vallen);
> + OBD_SLAB_FREE_PTR(xattr, xattr_kmem);
> +
> + return 0;
> + }
> +
> + return -ENODATA;
> +}
> +
> +/**
> + * This iterates cached extended attributes.
> + *
> + * Walk over cached attributes in @cache and
> + * fill in @xld_buffer or only calculate buffer
> + * size if @xld_buffer is NULL.
> + *
> + * \retval >= 0 buffer list size
> + * \retval -ENODATA if the list cannot fit @xld_size buffer
> + */
> +static int ll_xattr_cache_list(struct list_head *cache,
> + char *xld_buffer,
> + int xld_size)
> +{
> + struct ll_xattr_entry *xattr, *tmp;
> + int xld_tail = 0;
> +
> +
> +
> + list_for_each_entry_safe(xattr, tmp, cache, xe_list) {
> + CDEBUG(D_CACHE, "list: buffer=%p[%d] name=%s\n",
> + xld_buffer, xld_tail, xattr->xe_name);
> +
> + if (xld_buffer) {
> + xld_size -= xattr->xe_namelen;
> + if (xld_size < 0)
> + break;
> + memcpy(&xld_buffer[xld_tail],
> + xattr->xe_name, xattr->xe_namelen);
> + }
> + xld_tail += xattr->xe_namelen;
> + }
> +
> + if (xld_size < 0)
> + return -ERANGE;
> +
> + return xld_tail;
> +}
> +
> +/**
> + * Check if the xattr cache is initialized (filled).
> + *
> + * \retval 0 @cache is not initialized
> + * \retval 1 @cache is initialized
> + */
> +int ll_xattr_cache_valid(struct ll_inode_info *lli)
> +{
> + return !!(lli->lli_flags & LLIF_XATTR_CACHE);
> +}
> +
> +/**
> + * This finalizes the xattr cache.
> + *
> + * Free all xattr memory. @lli is the inode info pointer.
> + *
> + * \retval 0 no error occured
> + */
> +static int ll_xattr_cache_destroy_locked(struct ll_inode_info *lli)
> +{
> +
> +
> + if (!ll_xattr_cache_valid(lli))
> + return 0;
> +
> + while (ll_xattr_cache_del(&lli->lli_xattrs, NULL) == 0)
> + ; /* empty loop */
> + lli->lli_flags &= ~LLIF_XATTR_CACHE;
> +
> + return 0;
> +}
> +
> +int ll_xattr_cache_destroy(struct inode *inode)
> +{
> + struct ll_inode_info *lli = ll_i2info(inode);
> + int rc;
> +
> +
> +
> + down_write(&lli->lli_xattrs_list_rwsem);
> + rc = ll_xattr_cache_destroy_locked(lli);
> + up_write(&lli->lli_xattrs_list_rwsem);
> +
> + return rc;
> +}
> +
> +/**
> + * Match or enqueue a PR or PW LDLM lock.
> + *
> + * Find or request an LDLM lock with xattr data.
> + * Since LDLM does not provide API for atomic match_or_enqueue,
> + * the function handles it with a separate enq lock.
> + * If successful, the function exits with the list lock held.
> + *
> + * \retval 0 no error occured
> + * \retval -ENOMEM not enough memory
> + */
> +static int ll_xattr_find_get_lock(struct inode *inode,
> + struct lookup_intent *oit,
> + struct ptlrpc_request **req)
> +{
> + ldlm_mode_t mode;
> + struct lustre_handle lockh = { 0 };
> + struct md_op_data *op_data;
> + struct ll_inode_info *lli = ll_i2info(inode);
> + struct ldlm_enqueue_info einfo = { .ei_type = LDLM_IBITS,
> + .ei_mode = it_to_lock_mode(oit),
> + .ei_cb_bl = ll_md_blocking_ast,
> + .ei_cb_cp = ldlm_completion_ast };
> + struct ll_sb_info *sbi = ll_i2sbi(inode);
> + struct obd_export *exp = sbi->ll_md_exp;
> + int rc;
> +
> +
> +
> + mutex_lock(&lli->lli_xattrs_enq_lock);
> + /* Try matching first. */
> + mode = ll_take_md_lock(inode, MDS_INODELOCK_XATTR, &lockh, 0,
> + oit->it_op == IT_SETXATTR ? LCK_PW :
> + (LCK_PR | LCK_PW));
> + if (mode != 0) {
> + /* fake oit in mdc_revalidate_lock() manner */
> + oit->d.lustre.it_lock_handle = lockh.cookie;
> + oit->d.lustre.it_lock_mode = mode;
> + goto out;
> + }
> +
> + /* Enqueue if the lock isn't cached locally. */
> + op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
> + LUSTRE_OPC_ANY, NULL);
> + if (IS_ERR(op_data)) {
> + mutex_unlock(&lli->lli_xattrs_enq_lock);
> + return PTR_ERR(op_data);
> + }
> +
> + op_data->op_valid = OBD_MD_FLXATTR | OBD_MD_FLXATTRLS |
> + OBD_MD_FLXATTRLOCKED;
> +#ifdef CONFIG_FS_POSIX_ACL
> + /* If working with ACLs, we would like to cache local ACLs */
> + if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
> + op_data->op_valid |= OBD_MD_FLRMTLGETFACL;
> +#endif
> +
> + rc = md_enqueue(exp, &einfo, oit, op_data, &lockh, NULL, 0, NULL, 0);
> + ll_finish_md_op_data(op_data);
> +
> + if (rc < 0) {
> + CDEBUG(D_CACHE,
> + "md_intent_lock failed with %d for fid "DFID"\n",
> + rc, PFID(ll_inode2fid(inode)));
> + mutex_unlock(&lli->lli_xattrs_enq_lock);
> + return rc;
> + }
> +
> + *req = (struct ptlrpc_request *)oit->d.lustre.it_data;
> +out:
> + down_write(&lli->lli_xattrs_list_rwsem);
> + mutex_unlock(&lli->lli_xattrs_enq_lock);
> +
> + return 0;
> +}
> +
> +/**
> + * Refill the xattr cache.
> + *
> + * Fetch and cache the whole of xattrs for @inode, acquiring
> + * a read or a write xattr lock depending on operation in @oit.
> + * Intent is dropped on exit unless the operation is setxattr.
> + *
> + * \retval 0 no error occured
> + * \retval -EPROTO network protocol error
> + * \retval -ENOMEM not enough memory for the cache
> + */
> +static int ll_xattr_cache_refill(struct inode *inode, struct lookup_intent *oit)
> +{
> + struct ll_sb_info *sbi = ll_i2sbi(inode);
> + struct ptlrpc_request *req = NULL;
> + const char *xdata, *xval, *xtail, *xvtail;
> + struct ll_inode_info *lli = ll_i2info(inode);
> + struct mdt_body *body;
> + __u32 *xsizes;
> + int rc = 0, i;
> +
> +
> +
> + rc = ll_xattr_find_get_lock(inode, oit, &req);
> + if (rc)
> + GOTO(out_no_unlock, rc);
> +
> + /* Do we have the data at this point? */
> + if (ll_xattr_cache_valid(lli)) {
> + ll_stats_ops_tally(sbi, LPROC_LL_GETXATTR_HITS, 1);
> + GOTO(out_maybe_drop, rc = 0);
> + }
> +
> + /* Matched but no cache? Cancelled on error by a parallel refill. */
> + if (unlikely(req == NULL)) {
> + CDEBUG(D_CACHE, "cancelled by a parallel getxattr\n");
> + GOTO(out_maybe_drop, rc = -EIO);
> + }
> +
> + if (oit->d.lustre.it_status < 0) {
> + CDEBUG(D_CACHE, "getxattr intent returned %d for fid "DFID"\n",
> + oit->d.lustre.it_status, PFID(ll_inode2fid(inode)));
> + GOTO(out_destroy, rc = oit->d.lustre.it_status);
> + }
> +
> + body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
> + if (body == NULL) {
> + CERROR("no MDT BODY in the refill xattr reply\n");
> + GOTO(out_destroy, rc = -EPROTO);
> + }
> + /* do not need swab xattr data */
> + xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
> + body->eadatasize);
> + xval = req_capsule_server_sized_get(&req->rq_pill, &RMF_EAVALS,
> + body->aclsize);
> + xsizes = req_capsule_server_sized_get(&req->rq_pill, &RMF_EAVALS_LENS,
> + body->max_mdsize * sizeof(__u32));
> + if (xdata == NULL || xval == NULL || xsizes == NULL) {
> + CERROR("wrong setxattr reply\n");
> + GOTO(out_destroy, rc = -EPROTO);
> + }
> +
> + xtail = xdata + body->eadatasize;
> + xvtail = xval + body->aclsize;
> +
> + CDEBUG(D_CACHE, "caching: xdata=%p xtail=%p\n", xdata, xtail);
> +
> + ll_xattr_cache_init(lli);
> +
> + for (i = 0; i < body->max_mdsize; i++) {
> + CDEBUG(D_CACHE, "caching [%s]=%.*s\n", xdata, *xsizes, xval);
> + /* Perform consistency checks: attr names and vals in pill */
> + if (memchr(xdata, 0, xtail - xdata) == NULL) {
> + CERROR("xattr protocol violation (names are broken)\n");
> + rc = -EPROTO;
> + } else if (xval + *xsizes > xvtail) {
> + CERROR("xattr protocol violation (vals are broken)\n");
> + rc = -EPROTO;
> + } else if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_XATTR_ENOMEM)) {
> + rc = -ENOMEM;
> + } else {
> + rc = ll_xattr_cache_add(&lli->lli_xattrs, xdata, xval,
> + *xsizes);
> + }
> + if (rc < 0) {
> + ll_xattr_cache_destroy_locked(lli);
> + GOTO(out_destroy, rc);
> + }
> + xdata += strlen(xdata) + 1;
> + xval += *xsizes;
> + xsizes++;
> + }
> +
> + if (xdata != xtail || xval != xvtail)
> + CERROR("a hole in xattr data\n");
> +
> + ll_set_lock_data(sbi->ll_md_exp, inode, oit, NULL);
> +
> + GOTO(out_maybe_drop, rc);
> +out_maybe_drop:
> + /* drop lock on error or getxattr */
> + if (rc != 0 || oit->it_op != IT_SETXATTR)
> + ll_intent_drop_lock(oit);
> +
> + if (rc != 0)
> + up_write(&lli->lli_xattrs_list_rwsem);
> +out_no_unlock:
> + ptlrpc_req_finished(req);
> +
> + return rc;
> +
> +out_destroy:
> + up_write(&lli->lli_xattrs_list_rwsem);
> +
> + ldlm_lock_decref_and_cancel((struct lustre_handle *)
> + &oit->d.lustre.it_lock_handle,
> + oit->d.lustre.it_lock_mode);
> +
> + goto out_no_unlock;
> +}
> +
> +/**
> + * Get an xattr value or list xattrs using the write-through cache.
> + *
> + * Get the xattr value (@valid has OBD_MD_FLXATTR set) of @name or
> + * list xattr names (@valid has OBD_MD_FLXATTRLS set) for @inode.
> + * The resulting value/list is stored in @buffer if the former
> + * is not larger than @size.
> + *
> + * \retval 0 no error occured
> + * \retval -EPROTO network protocol error
> + * \retval -ENOMEM not enough memory for the cache
> + * \retval -ERANGE the buffer is not large enough
> + * \retval -ENODATA no such attr or the list is empty
> + */
> +int ll_xattr_cache_get(struct inode *inode,
> + const char *name,
> + char *buffer,
> + size_t size,
> + __u64 valid)
> +{
> + struct lookup_intent oit = { .it_op = IT_GETXATTR };
> + struct ll_inode_info *lli = ll_i2info(inode);
> + int rc = 0;
> +
> +
> +
> + LASSERT(!!(valid & OBD_MD_FLXATTR) ^ !!(valid & OBD_MD_FLXATTRLS));
> +
> + down_read(&lli->lli_xattrs_list_rwsem);
> + if (!ll_xattr_cache_valid(lli)) {
> + up_read(&lli->lli_xattrs_list_rwsem);
> + rc = ll_xattr_cache_refill(inode, &oit);
> + if (rc)
> + return rc;
> + downgrade_write(&lli->lli_xattrs_list_rwsem);
> + } else {
> + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR_HITS, 1);
> + }
> +
> + if (valid & OBD_MD_FLXATTR) {
> + struct ll_xattr_entry *xattr;
> +
> + rc = ll_xattr_cache_find(&lli->lli_xattrs, name, &xattr);
> + if (rc == 0) {
> + rc = xattr->xe_vallen;
> + /* zero size means we are only requested size in rc */
> + if (size != 0) {
> + if (size >= xattr->xe_vallen)
> + memcpy(buffer, xattr->xe_value,
> + xattr->xe_vallen);
> + else
> + rc = -ERANGE;
> + }
> + }
> + } else if (valid & OBD_MD_FLXATTRLS) {
> + rc = ll_xattr_cache_list(&lli->lli_xattrs,
> + size ? buffer : NULL, size);
> + }
> +
> + GOTO(out, rc);
> +out:
> + up_read(&lli->lli_xattrs_list_rwsem);
> +
> + return rc;
> +}
> +
> +
> +/**
> + * Set/update an xattr value or remove xattr using the write-through cache.
> + *
> + * Set/update the xattr value (if @valid has OBD_MD_FLXATTR) of @name to @newval
> + * or
> + * remove the xattr @name (@valid has OBD_MD_FLXATTRRM set) from @inode.
> + * @flags is either XATTR_CREATE or XATTR_REPLACE as defined by setxattr(2)
> + *
> + * \retval 0 no error occured
> + * \retval -EPROTO network protocol error
> + * \retval -ENOMEM not enough memory for the cache
> + * \retval -ERANGE the buffer is not large enough
> + * \retval -ENODATA no such attr (in the removal case)
> + */
> +int ll_xattr_cache_update(struct inode *inode,
> + const char *name,
> + const char *newval,
> + size_t size,
> + __u64 valid,
> + int flags)
> +{
> + struct lookup_intent oit = { .it_op = IT_SETXATTR };
> + struct ll_sb_info *sbi = ll_i2sbi(inode);
> + struct ptlrpc_request *req = NULL;
> + struct ll_inode_info *lli = ll_i2info(inode);
> + struct obd_capa *oc;
> + int rc;
> +
> +
> +
> + LASSERT(!!(valid & OBD_MD_FLXATTR) ^ !!(valid & OBD_MD_FLXATTRRM));
> +
> + rc = ll_xattr_cache_refill(inode, &oit);
> + if (rc)
> + return rc;
> +
> + oc = ll_mdscapa_get(inode);
> + rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
> + valid | OBD_MD_FLXATTRLOCKED, name, newval,
> + size, 0, flags, ll_i2suppgid(inode), &req);
> + capa_put(oc);
> +
> + if (rc) {
> + ll_intent_drop_lock(&oit);
> + GOTO(out, rc);
> + }
> +
> + if (valid & OBD_MD_FLXATTR)
> + rc = ll_xattr_cache_add(&lli->lli_xattrs, name, newval, size);
> + else if (valid & OBD_MD_FLXATTRRM)
> + rc = ll_xattr_cache_del(&lli->lli_xattrs, name);
> +
> + ll_intent_drop_lock(&oit);
> + GOTO(out, rc);
> +out:
> + up_write(&lli->lli_xattrs_list_rwsem);
> + ptlrpc_req_finished(req);
> +
> + return rc;
> +}
> diff --git a/drivers/staging/lustre/lustre/mdc/mdc_internal.h b/drivers/staging/lustre/lustre/mdc/mdc_internal.h
> index b995af6..5069829 100644
> --- a/drivers/staging/lustre/lustre/mdc/mdc_internal.h
> +++ b/drivers/staging/lustre/lustre/mdc/mdc_internal.h
> @@ -72,6 +72,7 @@ void mdc_open_pack(struct ptlrpc_request *req, struct md_op_data *op_data,
> __u32 mode, __u64 rdev, __u64 flags, const void *data,
> int datalen);
> void mdc_unlink_pack(struct ptlrpc_request *req, struct md_op_data *op_data);
> +void mdc_getxattr_pack(struct ptlrpc_request *req, struct md_op_data *op_data);
> void mdc_link_pack(struct ptlrpc_request *req, struct md_op_data *op_data);
> void mdc_rename_pack(struct ptlrpc_request *req, struct md_op_data *op_data,
> const char *old, int oldlen, const char *new, int newlen);
> diff --git a/drivers/staging/lustre/lustre/mdc/mdc_locks.c b/drivers/staging/lustre/lustre/mdc/mdc_locks.c
> index 09dee11..cc5490c 100644
> --- a/drivers/staging/lustre/lustre/mdc/mdc_locks.c
> +++ b/drivers/staging/lustre/lustre/mdc/mdc_locks.c
> @@ -360,6 +360,62 @@ static struct ptlrpc_request *mdc_intent_open_pack(struct obd_export *exp,
> return req;
> }
>
> +static struct ptlrpc_request *
> +mdc_intent_getxattr_pack(struct obd_export *exp,
> + struct lookup_intent *it,
> + struct md_op_data *op_data)
> +{
> + struct ptlrpc_request *req;
> + struct ldlm_intent *lit;
> + int rc, count = 0, maxdata;
> + LIST_HEAD(cancels);
> +
> +
> +
> + req = ptlrpc_request_alloc(class_exp2cliimp(exp),
> + &RQF_LDLM_INTENT_GETXATTR);
> + if (req == NULL)
> + return ERR_PTR(-ENOMEM);
> +
> + mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
> +
> + if (it->it_op == IT_SETXATTR)
> + /* If we want to upgrade to LCK_PW, let's cancel LCK_PR
> + * locks now. This avoids unnecessary ASTs. */
> + count = mdc_resource_get_unused(exp, &op_data->op_fid1,
> + &cancels, LCK_PW,
> + MDS_INODELOCK_XATTR);
> +
> + rc = ldlm_prep_enqueue_req(exp, req, &cancels, count);
> + if (rc) {
> + ptlrpc_request_free(req);
> + return ERR_PTR(rc);
> + }
> +
> + /* pack the intent */
> + lit = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
> + lit->opc = IT_GETXATTR;
> +
> + maxdata = class_exp2cliimp(exp)->imp_connect_data.ocd_max_easize;
> +
> + /* pack the intended request */
> + mdc_pack_body(req, &op_data->op_fid1, op_data->op_capa1,
> + op_data->op_valid, maxdata, -1, 0);
> +
> + req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
> + RCL_SERVER, maxdata);
> +
> + req_capsule_set_size(&req->rq_pill, &RMF_EAVALS,
> + RCL_SERVER, maxdata);
> +
> + req_capsule_set_size(&req->rq_pill, &RMF_EAVALS_LENS,
> + RCL_SERVER, maxdata);
> +
> + ptlrpc_request_set_replen(req);
> +
> + return req;
> +}
> +
> static struct ptlrpc_request *mdc_intent_unlink_pack(struct obd_export *exp,
> struct lookup_intent *it,
> struct md_op_data *op_data)
> @@ -735,6 +791,8 @@ int mdc_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
> { .l_inodebits = { MDS_INODELOCK_UPDATE } };
> static const ldlm_policy_data_t layout_policy =
> { .l_inodebits = { MDS_INODELOCK_LAYOUT } };
> + static const ldlm_policy_data_t getxattr_policy = {
> + .l_inodebits = { MDS_INODELOCK_XATTR } };
> ldlm_policy_data_t const *policy = &lookup_policy;
> int generation, resends = 0;
> struct ldlm_reply *lockrep;
> @@ -751,6 +809,8 @@ int mdc_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
> policy = &update_policy;
> else if (it->it_op & IT_LAYOUT)
> policy = &layout_policy;
> + else if (it->it_op & (IT_GETXATTR | IT_SETXATTR))
> + policy = &getxattr_policy;
> }
>
> LASSERT(reqp == NULL);
> @@ -781,9 +841,10 @@ resend:
> } else if (it->it_op & IT_LAYOUT) {
> if (!imp_connect_lvb_type(class_exp2cliimp(exp)))
> return -EOPNOTSUPP;
> -
> req = mdc_intent_layout_pack(exp, it, op_data);
> lvb_type = LVB_T_LAYOUT;
> + } else if (it->it_op & (IT_GETXATTR | IT_SETXATTR)) {
> + req = mdc_intent_getxattr_pack(exp, it, op_data);
> } else {
> LBUG();
> return -EINVAL;
> diff --git a/drivers/staging/lustre/lustre/ptlrpc/layout.c b/drivers/staging/lustre/lustre/ptlrpc/layout.c
> index c4381eb..eee8874 100644
> --- a/drivers/staging/lustre/lustre/ptlrpc/layout.c
> +++ b/drivers/staging/lustre/lustre/ptlrpc/layout.c
> @@ -462,6 +462,25 @@ static const struct req_msg_field *ldlm_intent_unlink_client[] = {
> &RMF_NAME
> };
>
> +static const struct req_msg_field *ldlm_intent_getxattr_client[] = {
> + &RMF_PTLRPC_BODY,
> + &RMF_DLM_REQ,
> + &RMF_LDLM_INTENT,
> + &RMF_MDT_BODY,
> + &RMF_CAPA1,
> +};
> +
> +static const struct req_msg_field *ldlm_intent_getxattr_server[] = {
> + &RMF_PTLRPC_BODY,
> + &RMF_DLM_REP,
> + &RMF_MDT_BODY,
> + &RMF_MDT_MD,
> + &RMF_ACL, /* for req_capsule_extend/mdt_intent_policy */
> + &RMF_EADATA,
> + &RMF_EAVALS,
> + &RMF_EAVALS_LENS
> +};
> +
> static const struct req_msg_field *mds_getxattr_client[] = {
> &RMF_PTLRPC_BODY,
> &RMF_MDT_BODY,
> @@ -739,6 +758,7 @@ static struct req_format *req_formats[] = {
> &RQF_LDLM_INTENT_OPEN,
> &RQF_LDLM_INTENT_CREATE,
> &RQF_LDLM_INTENT_UNLINK,
> + &RQF_LDLM_INTENT_GETXATTR,
> &RQF_LDLM_INTENT_QUOTA,
> &RQF_QUOTA_DQACQ,
> &RQF_LOG_CANCEL,
> @@ -1013,6 +1033,9 @@ struct req_msg_field RMF_EADATA = DEFINE_MSGF("eadata", 0, -1,
> NULL, NULL);
> EXPORT_SYMBOL(RMF_EADATA);
>
> +struct req_msg_field RMF_EAVALS = DEFINE_MSGF("eavals", 0, -1, NULL, NULL);
> +EXPORT_SYMBOL(RMF_EAVALS);
> +
> struct req_msg_field RMF_ACL =
> DEFINE_MSGF("acl", RMF_F_NO_SIZE_CHECK,
> LUSTRE_POSIX_ACL_MAX_SIZE, NULL, NULL);
> @@ -1064,6 +1087,11 @@ struct req_msg_field RMF_RCS =
> lustre_swab_generic_32s, dump_rcs);
> EXPORT_SYMBOL(RMF_RCS);
>
> +struct req_msg_field RMF_EAVALS_LENS =
> + DEFINE_MSGF("eavals_lens", RMF_F_STRUCT_ARRAY, sizeof(__u32),
> + lustre_swab_generic_32s, NULL);
> +EXPORT_SYMBOL(RMF_EAVALS_LENS);
> +
> struct req_msg_field RMF_OBD_ID =
> DEFINE_MSGF("obd_id", 0,
> sizeof(obd_id), lustre_swab_ost_last_id, NULL);
> @@ -1421,6 +1449,12 @@ struct req_format RQF_LDLM_INTENT_UNLINK =
> ldlm_intent_unlink_client, ldlm_intent_server);
> EXPORT_SYMBOL(RQF_LDLM_INTENT_UNLINK);
>
> +struct req_format RQF_LDLM_INTENT_GETXATTR =
> + DEFINE_REQ_FMT0("LDLM_INTENT_GETXATTR",
> + ldlm_intent_getxattr_client,
> + ldlm_intent_getxattr_server);
> +EXPORT_SYMBOL(RQF_LDLM_INTENT_GETXATTR);
> +
> struct req_format RQF_MDS_CLOSE =
> DEFINE_REQ_FMT0("MDS_CLOSE",
> mdt_close_client, mds_last_unlink_server);
> --
> 1.7.9.5
>
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