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Orangefs: kernel client part 5 

Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Mike Marshall 2015-07-17 10:38:15 -04:00
parent f7be4ee07f
commit 1182fca3bc
4 changed files with 1643 additions and 0 deletions
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558
fs/orangefs/super.c Normal file
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/*
* (C) 2001 Clemson University and The University of Chicago
*
* See COPYING in top-level directory.
*/
#include "protocol.h"
#include "pvfs2-kernel.h"
#include "pvfs2-bufmap.h"
#include <linux/parser.h>
/* a cache for pvfs2-inode objects (i.e. pvfs2 inode private data) */
static struct kmem_cache *pvfs2_inode_cache;
/* list for storing pvfs2 specific superblocks in use */
LIST_HEAD(pvfs2_superblocks);
DEFINE_SPINLOCK(pvfs2_superblocks_lock);
enum {
Opt_intr,
Opt_acl,
Opt_local_lock,
Opt_err
};
static const match_table_t tokens = {
{ Opt_acl, "acl" },
{ Opt_intr, "intr" },
{ Opt_local_lock, "local_lock" },
{ Opt_err, NULL }
};
static int parse_mount_options(struct super_block *sb, char *options,
int silent)
{
struct pvfs2_sb_info_s *pvfs2_sb = PVFS2_SB(sb);
substring_t args[MAX_OPT_ARGS];
char *p;
/*
* Force any potential flags that might be set from the mount
* to zero, ie, initialize to unset.
*/
sb->s_flags &= ~MS_POSIXACL;
pvfs2_sb->flags &= ~PVFS2_OPT_INTR;
pvfs2_sb->flags &= ~PVFS2_OPT_LOCAL_LOCK;
while ((p = strsep(&options, ",")) != NULL) {
int token;
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_acl:
sb->s_flags |= MS_POSIXACL;
break;
case Opt_intr:
pvfs2_sb->flags |= PVFS2_OPT_INTR;
break;
case Opt_local_lock:
pvfs2_sb->flags |= PVFS2_OPT_LOCAL_LOCK;
break;
default:
goto fail;
}
}
return 0;
fail:
if (!silent)
gossip_err("Error: mount option [%s] is not supported.\n", p);
return -EINVAL;
}
static void pvfs2_inode_cache_ctor(void *req)
{
struct pvfs2_inode_s *pvfs2_inode = req;
inode_init_once(&pvfs2_inode->vfs_inode);
init_rwsem(&pvfs2_inode->xattr_sem);
pvfs2_inode->vfs_inode.i_version = 1;
}
static struct inode *pvfs2_alloc_inode(struct super_block *sb)
{
struct pvfs2_inode_s *pvfs2_inode;
pvfs2_inode = kmem_cache_alloc(pvfs2_inode_cache,
PVFS2_CACHE_ALLOC_FLAGS);
if (pvfs2_inode == NULL) {
gossip_err("Failed to allocate pvfs2_inode\n");
return NULL;
}
/*
* We want to clear everything except for rw_semaphore and the
* vfs_inode.
*/
memset(&pvfs2_inode->refn.khandle, 0, 16);
pvfs2_inode->refn.fs_id = PVFS_FS_ID_NULL;
pvfs2_inode->last_failed_block_index_read = 0;
memset(pvfs2_inode->link_target, 0, sizeof(pvfs2_inode->link_target));
pvfs2_inode->pinode_flags = 0;
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_alloc_inode: allocated %p\n",
&pvfs2_inode->vfs_inode);
return &pvfs2_inode->vfs_inode;
}
static void pvfs2_destroy_inode(struct inode *inode)
{
struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
gossip_debug(GOSSIP_SUPER_DEBUG,
"%s: deallocated %p destroying inode %pU\n",
__func__, pvfs2_inode, get_khandle_from_ino(inode));
kmem_cache_free(pvfs2_inode_cache, pvfs2_inode);
}
/*
* NOTE: information filled in here is typically reflected in the
* output of the system command 'df'
*/
static int pvfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
int ret = -ENOMEM;
struct pvfs2_kernel_op_s *new_op = NULL;
int flags = 0;
struct super_block *sb = NULL;
sb = dentry->d_sb;
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_statfs: called on sb %p (fs_id is %d)\n",
sb,
(int)(PVFS2_SB(sb)->fs_id));
new_op = op_alloc(PVFS2_VFS_OP_STATFS);
if (!new_op)
return ret;
new_op->upcall.req.statfs.fs_id = PVFS2_SB(sb)->fs_id;
if (PVFS2_SB(sb)->flags & PVFS2_OPT_INTR)
flags = PVFS2_OP_INTERRUPTIBLE;
ret = service_operation(new_op, "pvfs2_statfs", flags);
if (new_op->downcall.status < 0)
goto out_op_release;
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_statfs: got %ld blocks available | "
"%ld blocks total | %ld block size\n",
(long)new_op->downcall.resp.statfs.blocks_avail,
(long)new_op->downcall.resp.statfs.blocks_total,
(long)new_op->downcall.resp.statfs.block_size);
buf->f_type = sb->s_magic;
memcpy(&buf->f_fsid, &PVFS2_SB(sb)->fs_id, sizeof(buf->f_fsid));
buf->f_bsize = new_op->downcall.resp.statfs.block_size;
buf->f_namelen = PVFS2_NAME_LEN;
buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
buf->f_frsize = sb->s_blocksize;
out_op_release:
op_release(new_op);
gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_statfs: returning %d\n", ret);
return ret;
}
/*
* Remount as initiated by VFS layer. We just need to reparse the mount
* options, no need to signal pvfs2-client-core about it.
*/
static int pvfs2_remount_fs(struct super_block *sb, int *flags, char *data)
{
gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_remount_fs: called\n");
return parse_mount_options(sb, data, 1);
}
/*
* Remount as initiated by pvfs2-client-core on restart. This is used to
* repopulate mount information left from previous pvfs2-client-core.
*
* the idea here is that given a valid superblock, we're
* re-initializing the user space client with the initial mount
* information specified when the super block was first initialized.
* this is very different than the first initialization/creation of a
* superblock. we use the special service_priority_operation to make
* sure that the mount gets ahead of any other pending operation that
* is waiting for servicing. this means that the pvfs2-client won't
* fail to start several times for all other pending operations before
* the client regains all of the mount information from us.
* NOTE: this function assumes that the request_mutex is already acquired!
*/
int pvfs2_remount(struct super_block *sb)
{
struct pvfs2_kernel_op_s *new_op;
int ret = -EINVAL;
gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_remount: called\n");
new_op = op_alloc(PVFS2_VFS_OP_FS_MOUNT);
if (!new_op)
return -ENOMEM;
strncpy(new_op->upcall.req.fs_mount.pvfs2_config_server,
PVFS2_SB(sb)->devname,
PVFS_MAX_SERVER_ADDR_LEN);
gossip_debug(GOSSIP_SUPER_DEBUG,
"Attempting PVFS2 Remount via host %s\n",
new_op->upcall.req.fs_mount.pvfs2_config_server);
/*
* we assume that the calling function has already acquire the
* request_mutex to prevent other operations from bypassing
* this one
*/
ret = service_operation(new_op, "pvfs2_remount",
PVFS2_OP_PRIORITY | PVFS2_OP_NO_SEMAPHORE);
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_remount: mount got return value of %d\n",
ret);
if (ret == 0) {
/*
* store the id assigned to this sb -- it's just a
* short-lived mapping that the system interface uses
* to map this superblock to a particular mount entry
*/
PVFS2_SB(sb)->id = new_op->downcall.resp.fs_mount.id;
PVFS2_SB(sb)->mount_pending = 0;
}
op_release(new_op);
return ret;
}
int fsid_key_table_initialize(void)
{
return 0;
}
void fsid_key_table_finalize(void)
{
}
/* Called whenever the VFS dirties the inode in response to atime updates */
static void pvfs2_dirty_inode(struct inode *inode, int flags)
{
struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_dirty_inode: %pU\n",
get_khandle_from_ino(inode));
SetAtimeFlag(pvfs2_inode);
}
struct super_operations pvfs2_s_ops = {
.alloc_inode = pvfs2_alloc_inode,
.destroy_inode = pvfs2_destroy_inode,
.dirty_inode = pvfs2_dirty_inode,
.drop_inode = generic_delete_inode,
.statfs = pvfs2_statfs,
.remount_fs = pvfs2_remount_fs,
.show_options = generic_show_options,
};
struct dentry *pvfs2_fh_to_dentry(struct super_block *sb,
struct fid *fid,
int fh_len,
int fh_type)
{
struct pvfs2_object_kref refn;
if (fh_len < 5 || fh_type > 2)
return NULL;
PVFS_khandle_from(&(refn.khandle), fid->raw, 16);
refn.fs_id = (u32) fid->raw[4];
gossip_debug(GOSSIP_SUPER_DEBUG,
"fh_to_dentry: handle %pU, fs_id %d\n",
&refn.khandle,
refn.fs_id);
return d_obtain_alias(pvfs2_iget(sb, &refn));
}
int pvfs2_encode_fh(struct inode *inode,
__u32 *fh,
int *max_len,
struct inode *parent)
{
int len = parent ? 10 : 5;
int type = 1;
struct pvfs2_object_kref refn;
if (*max_len < len) {
gossip_lerr("fh buffer is too small for encoding\n");
*max_len = len;
type = 255;
goto out;
}
refn = PVFS2_I(inode)->refn;
PVFS_khandle_to(&refn.khandle, fh, 16);
fh[4] = refn.fs_id;
gossip_debug(GOSSIP_SUPER_DEBUG,
"Encoding fh: handle %pU, fsid %u\n",
&refn.khandle,
refn.fs_id);
if (parent) {
refn = PVFS2_I(parent)->refn;
PVFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
fh[9] = refn.fs_id;
type = 2;
gossip_debug(GOSSIP_SUPER_DEBUG,
"Encoding parent: handle %pU, fsid %u\n",
&refn.khandle,
refn.fs_id);
}
*max_len = len;
out:
return type;
}
static struct export_operations pvfs2_export_ops = {
.encode_fh = pvfs2_encode_fh,
.fh_to_dentry = pvfs2_fh_to_dentry,
};
int pvfs2_fill_sb(struct super_block *sb, void *data, int silent)
{
int ret = -EINVAL;
struct inode *root = NULL;
struct dentry *root_dentry = NULL;
struct pvfs2_mount_sb_info_s *mount_sb_info =
(struct pvfs2_mount_sb_info_s *) data;
struct pvfs2_object_kref root_object;
/* alloc and init our private pvfs2 sb info */
sb->s_fs_info =
kmalloc(sizeof(struct pvfs2_sb_info_s), PVFS2_GFP_FLAGS);
if (!PVFS2_SB(sb))
return -ENOMEM;
memset(sb->s_fs_info, 0, sizeof(struct pvfs2_sb_info_s));
PVFS2_SB(sb)->sb = sb;
PVFS2_SB(sb)->root_khandle = mount_sb_info->root_khandle;
PVFS2_SB(sb)->fs_id = mount_sb_info->fs_id;
PVFS2_SB(sb)->id = mount_sb_info->id;
if (mount_sb_info->data) {
ret = parse_mount_options(sb, mount_sb_info->data,
silent);
if (ret)
return ret;
}
/* Hang the xattr handlers off the superblock */
sb->s_xattr = pvfs2_xattr_handlers;
sb->s_magic = PVFS2_SUPER_MAGIC;
sb->s_op = &pvfs2_s_ops;
sb->s_d_op = &pvfs2_dentry_operations;
sb->s_blocksize = pvfs_bufmap_size_query();
sb->s_blocksize_bits = pvfs_bufmap_shift_query();
sb->s_maxbytes = MAX_LFS_FILESIZE;
root_object.khandle = PVFS2_SB(sb)->root_khandle;
root_object.fs_id = PVFS2_SB(sb)->fs_id;
gossip_debug(GOSSIP_SUPER_DEBUG,
"get inode %pU, fsid %d\n",
&root_object.khandle,
root_object.fs_id);
root = pvfs2_iget(sb, &root_object);
if (IS_ERR(root))
return PTR_ERR(root);
gossip_debug(GOSSIP_SUPER_DEBUG,
"Allocated root inode [%p] with mode %x\n",
root,
root->i_mode);
/* allocates and places root dentry in dcache */
root_dentry = d_make_root(root);
if (!root_dentry) {
iput(root);
return -ENOMEM;
}
sb->s_export_op = &pvfs2_export_ops;
sb->s_root = root_dentry;
return 0;
}
struct dentry *pvfs2_mount(struct file_system_type *fst,
int flags,
const char *devname,
void *data)
{
int ret = -EINVAL;
struct super_block *sb = ERR_PTR(-EINVAL);
struct pvfs2_kernel_op_s *new_op;
struct pvfs2_mount_sb_info_s mount_sb_info;
struct dentry *mnt_sb_d = ERR_PTR(-EINVAL);
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_mount: called with devname %s\n",
devname);
if (!devname) {
gossip_err("ERROR: device name not specified.\n");
return ERR_PTR(-EINVAL);
}
new_op = op_alloc(PVFS2_VFS_OP_FS_MOUNT);
if (!new_op)
return ERR_PTR(-ENOMEM);
strncpy(new_op->upcall.req.fs_mount.pvfs2_config_server,
devname,
PVFS_MAX_SERVER_ADDR_LEN);
gossip_debug(GOSSIP_SUPER_DEBUG,
"Attempting PVFS2 Mount via host %s\n",
new_op->upcall.req.fs_mount.pvfs2_config_server);
ret = service_operation(new_op, "pvfs2_mount", 0);
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_mount: mount got return value of %d\n", ret);
if (ret)
goto free_op;
if (new_op->downcall.resp.fs_mount.fs_id == PVFS_FS_ID_NULL) {
gossip_err("ERROR: Retrieved null fs_id\n");
ret = -EINVAL;
goto free_op;
}
/* fill in temporary structure passed to fill_sb method */
mount_sb_info.data = data;
mount_sb_info.root_khandle =
new_op->downcall.resp.fs_mount.root_khandle;
mount_sb_info.fs_id = new_op->downcall.resp.fs_mount.fs_id;
mount_sb_info.id = new_op->downcall.resp.fs_mount.id;
/*
* the mount_sb_info structure looks odd, but it's used because
* the private sb info isn't allocated until we call
* pvfs2_fill_sb, yet we have the info we need to fill it with
* here. so we store it temporarily and pass all of the info
* to fill_sb where it's properly copied out
*/
mnt_sb_d = mount_nodev(fst,
flags,
(void *)&mount_sb_info,
pvfs2_fill_sb);
if (IS_ERR(mnt_sb_d)) {
sb = ERR_CAST(mnt_sb_d);
goto free_op;
}
sb = mnt_sb_d->d_sb;
/*
* on successful mount, store the devname and data
* used
*/
strncpy(PVFS2_SB(sb)->devname,
devname,
PVFS_MAX_SERVER_ADDR_LEN);
/* mount_pending must be cleared */
PVFS2_SB(sb)->mount_pending = 0;
/*
* finally, add this sb to our list of known pvfs2
* sb's
*/
add_pvfs2_sb(sb);
op_release(new_op);
return mnt_sb_d;
free_op:
gossip_err("pvfs2_mount: mount request failed with %d\n", ret);
if (ret == -EINVAL) {
gossip_err("Ensure that all pvfs2-servers have the same FS configuration files\n");
gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
}
op_release(new_op);
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_mount: returning dentry %p\n",
mnt_sb_d);
return mnt_sb_d;
}
void pvfs2_kill_sb(struct super_block *sb)
{
gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_kill_sb: called\n");
/*
* issue the unmount to userspace to tell it to remove the
* dynamic mount info it has for this superblock
*/
pvfs2_unmount_sb(sb);
/* remove the sb from our list of pvfs2 specific sb's */
remove_pvfs2_sb(sb);
/* provided sb cleanup */
kill_anon_super(sb);
/* free the pvfs2 superblock private data */
kfree(PVFS2_SB(sb));
}
int pvfs2_inode_cache_initialize(void)
{
pvfs2_inode_cache = kmem_cache_create("pvfs2_inode_cache",
sizeof(struct pvfs2_inode_s),
0,
PVFS2_CACHE_CREATE_FLAGS,
pvfs2_inode_cache_ctor);
if (!pvfs2_inode_cache) {
gossip_err("Cannot create pvfs2_inode_cache\n");
return -ENOMEM;
}
return 0;
}
int pvfs2_inode_cache_finalize(void)
{
kmem_cache_destroy(pvfs2_inode_cache);
return 0;
}

31
fs/orangefs/symlink.c Normal file
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/*
* (C) 2001 Clemson University and The University of Chicago
*
* See COPYING in top-level directory.
*/
#include "protocol.h"
#include "pvfs2-kernel.h"
#include "pvfs2-bufmap.h"
static const char *pvfs2_follow_link(struct dentry *dentry, void **cookie)
{
char *target = PVFS2_I(dentry->d_inode)->link_target;
gossip_debug(GOSSIP_INODE_DEBUG,
"%s: called on %s (target is %p)\n",
__func__, (char *)dentry->d_name.name, target);
*cookie = target;
return target;
}
struct inode_operations pvfs2_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = pvfs2_follow_link,
.setattr = pvfs2_setattr,
.getattr = pvfs2_getattr,
.listxattr = pvfs2_listxattr,
.setxattr = generic_setxattr,
};

522
fs/orangefs/waitqueue.c Normal file
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/*
* (C) 2001 Clemson University and The University of Chicago
* (C) 2011 Omnibond Systems
*
* Changes by Acxiom Corporation to implement generic service_operation()
* function, Copyright Acxiom Corporation, 2005.
*
* See COPYING in top-level directory.
*/
/*
* In-kernel waitqueue operations.
*/
#include "protocol.h"
#include "pvfs2-kernel.h"
#include "pvfs2-bufmap.h"
/*
* What we do in this function is to walk the list of operations that are
* present in the request queue and mark them as purged.
* NOTE: This is called from the device close after client-core has
* guaranteed that no new operations could appear on the list since the
* client-core is anyway going to exit.
*/
void purge_waiting_ops(void)
{
struct pvfs2_kernel_op_s *op;
spin_lock(&pvfs2_request_list_lock);
list_for_each_entry(op, &pvfs2_request_list, list) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"pvfs2-client-core: purging op tag %llu %s\n",
llu(op->tag),
get_opname_string(op));
spin_lock(&op->lock);
set_op_state_purged(op);
spin_unlock(&op->lock);
wake_up_interruptible(&op->waitq);
}
spin_unlock(&pvfs2_request_list_lock);
}
/*
* submits a PVFS2 operation and waits for it to complete
*
* Note op->downcall.status will contain the status of the operation (in
* errno format), whether provided by pvfs2-client or a result of failure to
* service the operation. If the caller wishes to distinguish, then
* op->state can be checked to see if it was serviced or not.
*
* Returns contents of op->downcall.status for convenience
*/
int service_operation(struct pvfs2_kernel_op_s *op,
const char *op_name,
int flags)
{
/* flags to modify behavior */
sigset_t orig_sigset;
int ret = 0;
/* irqflags and wait_entry are only used IF the client-core aborts */
unsigned long irqflags;
DECLARE_WAITQUEUE(wait_entry, current);
op->upcall.tgid = current->tgid;
op->upcall.pid = current->pid;
retry_servicing:
op->downcall.status = 0;
gossip_debug(GOSSIP_WAIT_DEBUG,
"pvfs2: service_operation: %s %p\n",
op_name,
op);
gossip_debug(GOSSIP_WAIT_DEBUG,
"pvfs2: operation posted by process: %s, pid: %i\n",
current->comm,
current->pid);
/* mask out signals if this operation is not to be interrupted */
if (!(flags & PVFS2_OP_INTERRUPTIBLE))
mask_blocked_signals(&orig_sigset);
if (!(flags & PVFS2_OP_NO_SEMAPHORE)) {
ret = mutex_lock_interruptible(&request_mutex);
/*
* check to see if we were interrupted while waiting for
* semaphore
*/
if (ret < 0) {
if (!(flags & PVFS2_OP_INTERRUPTIBLE))
unmask_blocked_signals(&orig_sigset);
op->downcall.status = ret;
gossip_debug(GOSSIP_WAIT_DEBUG,
"pvfs2: service_operation interrupted.\n");
return ret;
}
}
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:About to call is_daemon_in_service().\n",
__func__);
if (is_daemon_in_service() < 0) {
/*
* By incrementing the per-operation attempt counter, we
* directly go into the timeout logic while waiting for
* the matching downcall to be read
*/
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:client core is NOT in service(%d).\n",
__func__,
is_daemon_in_service());
op->attempts++;
}
/* queue up the operation */
if (flags & PVFS2_OP_PRIORITY) {
add_priority_op_to_request_list(op);
} else {
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:About to call add_op_to_request_list().\n",
__func__);
add_op_to_request_list(op);
}
if (!(flags & PVFS2_OP_NO_SEMAPHORE))
mutex_unlock(&request_mutex);
/*
* If we are asked to service an asynchronous operation from
* VFS perspective, we are done.
*/
if (flags & PVFS2_OP_ASYNC)
return 0;
if (flags & PVFS2_OP_CANCELLATION) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:"
"About to call wait_for_cancellation_downcall.\n",
__func__);
ret = wait_for_cancellation_downcall(op);
} else {
ret = wait_for_matching_downcall(op);
}
if (ret < 0) {
/* failed to get matching downcall */
if (ret == -ETIMEDOUT) {
gossip_err("pvfs2: %s -- wait timed out; aborting attempt.\n",
op_name);
}
op->downcall.status = ret;
} else {
/* got matching downcall; make sure status is in errno format */
op->downcall.status =
pvfs2_normalize_to_errno(op->downcall.status);
ret = op->downcall.status;
}
if (!(flags & PVFS2_OP_INTERRUPTIBLE))
unmask_blocked_signals(&orig_sigset);
BUG_ON(ret != op->downcall.status);
/* retry if operation has not been serviced and if requested */
if (!op_state_serviced(op) && op->downcall.status == -EAGAIN) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"pvfs2: tag %llu (%s)"
" -- operation to be retried (%d attempt)\n",
llu(op->tag),
op_name,
op->attempts + 1);
if (!op->uses_shared_memory)
/*
* this operation doesn't use the shared memory
* system
*/
goto retry_servicing;
/* op uses shared memory */
if (get_bufmap_init() == 0) {
/*
* This operation uses the shared memory system AND
* the system is not yet ready. This situation occurs
* when the client-core is restarted AND there were
* operations waiting to be processed or were already
* in process.
*/
gossip_debug(GOSSIP_WAIT_DEBUG,
"uses_shared_memory is true.\n");
gossip_debug(GOSSIP_WAIT_DEBUG,
"Client core in-service status(%d).\n",
is_daemon_in_service());
gossip_debug(GOSSIP_WAIT_DEBUG, "bufmap_init:%d.\n",
get_bufmap_init());
gossip_debug(GOSSIP_WAIT_DEBUG,
"operation's status is 0x%0x.\n",
op->op_state);
/*
* let process sleep for a few seconds so shared
* memory system can be initialized.
*/
spin_lock_irqsave(&op->lock, irqflags);
add_wait_queue(&pvfs2_bufmap_init_waitq, &wait_entry);
spin_unlock_irqrestore(&op->lock, irqflags);
set_current_state(TASK_INTERRUPTIBLE);
/*
* Wait for pvfs_bufmap_initialize() to wake me up
* within the allotted time.
*/
ret = schedule_timeout(MSECS_TO_JIFFIES
(1000 * PVFS2_BUFMAP_WAIT_TIMEOUT_SECS));
gossip_debug(GOSSIP_WAIT_DEBUG,
"Value returned from schedule_timeout:"
"%d.\n",
ret);
gossip_debug(GOSSIP_WAIT_DEBUG,
"Is shared memory available? (%d).\n",
get_bufmap_init());
spin_lock_irqsave(&op->lock, irqflags);
remove_wait_queue(&pvfs2_bufmap_init_waitq,
&wait_entry);
spin_unlock_irqrestore(&op->lock, irqflags);
if (get_bufmap_init() == 0) {
gossip_err("%s:The shared memory system has not started in %d seconds after the client core restarted. Aborting user's request(%s).\n",
__func__,
PVFS2_BUFMAP_WAIT_TIMEOUT_SECS,
get_opname_string(op));
return -EIO;
}
/*
* Return to the calling function and re-populate a
* shared memory buffer.
*/
return -EAGAIN;
}
}
gossip_debug(GOSSIP_WAIT_DEBUG,
"pvfs2: service_operation %s returning: %d for %p.\n",
op_name,
ret,
op);
return ret;
}
void pvfs2_clean_up_interrupted_operation(struct pvfs2_kernel_op_s *op)
{
/*
* handle interrupted cases depending on what state we were in when
* the interruption is detected. there is a coarse grained lock
* across the operation.
*
* NOTE: be sure not to reverse lock ordering by locking an op lock
* while holding the request_list lock. Here, we first lock the op
* and then lock the appropriate list.
*/
if (!op) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s: op is null, ignoring\n",
__func__);
return;
}
/*
* one more sanity check, make sure it's in one of the possible states
* or don't try to cancel it
*/
if (!(op_state_waiting(op) ||
op_state_in_progress(op) ||
op_state_serviced(op) ||
op_state_purged(op))) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s: op %p not in a valid state (%0x), "
"ignoring\n",
__func__,
op,
op->op_state);
return;
}
spin_lock(&op->lock);
if (op_state_waiting(op)) {
/*
* upcall hasn't been read; remove op from upcall request
* list.
*/
spin_unlock(&op->lock);
remove_op_from_request_list(op);
gossip_debug(GOSSIP_WAIT_DEBUG,
"Interrupted: Removed op %p from request_list\n",
op);
} else if (op_state_in_progress(op)) {
/* op must be removed from the in progress htable */
spin_unlock(&op->lock);
spin_lock(&htable_ops_in_progress_lock);
list_del(&op->list);
spin_unlock(&htable_ops_in_progress_lock);
gossip_debug(GOSSIP_WAIT_DEBUG,
"Interrupted: Removed op %p"
" from htable_ops_in_progress\n",
op);
} else if (!op_state_serviced(op)) {
spin_unlock(&op->lock);
gossip_err("interrupted operation is in a weird state 0x%x\n",
op->op_state);
}
}
/*
* sleeps on waitqueue waiting for matching downcall.
* if client-core finishes servicing, then we are good to go.
* else if client-core exits, we get woken up here, and retry with a timeout
*
* Post when this call returns to the caller, the specified op will no
* longer be on any list or htable.
*
* Returns 0 on success and -errno on failure
* Errors are:
* EAGAIN in case we want the caller to requeue and try again..
* EINTR/EIO/ETIMEDOUT indicating we are done trying to service this
* operation since client-core seems to be exiting too often
* or if we were interrupted.
*/
int wait_for_matching_downcall(struct pvfs2_kernel_op_s *op)
{
int ret = -EINVAL;
DECLARE_WAITQUEUE(wait_entry, current);
spin_lock(&op->lock);
add_wait_queue(&op->waitq, &wait_entry);
spin_unlock(&op->lock);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
spin_lock(&op->lock);
if (op_state_serviced(op)) {
spin_unlock(&op->lock);
ret = 0;
break;
}
spin_unlock(&op->lock);
if (!signal_pending(current)) {
/*
* if this was our first attempt and client-core
* has not purged our operation, we are happy to
* simply wait
*/
spin_lock(&op->lock);
if (op->attempts == 0 && !op_state_purged(op)) {
spin_unlock(&op->lock);
schedule();
} else {
spin_unlock(&op->lock);
/*
* subsequent attempts, we retry exactly once
* with timeouts
*/
if (!schedule_timeout(MSECS_TO_JIFFIES
(1000 * op_timeout_secs))) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"*** %s:"
" operation timed out (tag"
" %llu, %p, att %d)\n",
__func__,
llu(op->tag),
op,
op->attempts);
ret = -ETIMEDOUT;
pvfs2_clean_up_interrupted_operation
(op);
break;
}
}
spin_lock(&op->lock);
op->attempts++;
/*
* if the operation was purged in the meantime, it
* is better to requeue it afresh but ensure that
* we have not been purged repeatedly. This could
* happen if client-core crashes when an op
* is being serviced, so we requeue the op, client
* core crashes again so we requeue the op, client
* core starts, and so on...
*/
if (op_state_purged(op)) {
ret = (op->attempts < PVFS2_PURGE_RETRY_COUNT) ?
-EAGAIN :
-EIO;
spin_unlock(&op->lock);
gossip_debug(GOSSIP_WAIT_DEBUG,
"*** %s:"
" operation purged (tag "
"%llu, %p, att %d)\n",
__func__,
llu(op->tag),
op,
op->attempts);
pvfs2_clean_up_interrupted_operation(op);
break;
}
spin_unlock(&op->lock);
continue;
}
gossip_debug(GOSSIP_WAIT_DEBUG,
"*** %s:"
" operation interrupted by a signal (tag "
"%llu, op %p)\n",
__func__,
llu(op->tag),
op);
pvfs2_clean_up_interrupted_operation(op);
ret = -EINTR;
break;
}
set_current_state(TASK_RUNNING);
spin_lock(&op->lock);
remove_wait_queue(&op->waitq, &wait_entry);
spin_unlock(&op->lock);
return ret;
}
/*
* similar to wait_for_matching_downcall(), but used in the special case
* of I/O cancellations.
*
* Note we need a special wait function because if this is called we already
* know that a signal is pending in current and need to service the
* cancellation upcall anyway. the only way to exit this is to either
* timeout or have the cancellation be serviced properly.
*/
int wait_for_cancellation_downcall(struct pvfs2_kernel_op_s *op)
{
int ret = -EINVAL;
DECLARE_WAITQUEUE(wait_entry, current);
spin_lock(&op->lock);
add_wait_queue(&op->waitq, &wait_entry);
spin_unlock(&op->lock);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
spin_lock(&op->lock);
if (op_state_serviced(op)) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:op-state is SERVICED.\n",
__func__);
spin_unlock(&op->lock);
ret = 0;
break;
}
spin_unlock(&op->lock);
if (signal_pending(current)) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:operation interrupted by a signal (tag"
" %llu, op %p)\n",
__func__,
llu(op->tag),
op);
pvfs2_clean_up_interrupted_operation(op);
ret = -EINTR;
break;
}
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:About to call schedule_timeout.\n",
__func__);
ret =
schedule_timeout(MSECS_TO_JIFFIES(1000 * op_timeout_secs));
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:Value returned from schedule_timeout(%d).\n",
__func__,
ret);
if (!ret) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:*** operation timed out: %p\n",
__func__,
op);
pvfs2_clean_up_interrupted_operation(op);
ret = -ETIMEDOUT;
break;
}
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:Breaking out of loop, regardless of value returned by schedule_timeout.\n",
__func__);
ret = -ETIMEDOUT;
break;
}
set_current_state(TASK_RUNNING);
spin_lock(&op->lock);
remove_wait_queue(&op->waitq, &wait_entry);
spin_unlock(&op->lock);
gossip_debug(GOSSIP_WAIT_DEBUG,
"%s:returning ret(%d)\n",
__func__,
ret);
return ret;
}

532
fs/orangefs/xattr.c Normal file
View File

@ -0,0 +1,532 @@
/*
* (C) 2001 Clemson University and The University of Chicago
*
* See COPYING in top-level directory.
*/
/*
* Linux VFS extended attribute operations.
*/
#include "protocol.h"
#include "pvfs2-kernel.h"
#include "pvfs2-bufmap.h"
#include <linux/posix_acl_xattr.h>
#include <linux/xattr.h>
#define SYSTEM_PVFS2_KEY "system.pvfs2."
#define SYSTEM_PVFS2_KEY_LEN 13
/*
* this function returns
* 0 if the key corresponding to name is not meant to be printed as part
* of a listxattr.
* 1 if the key corresponding to name is meant to be returned as part of
* a listxattr.
* The ones that start SYSTEM_PVFS2_KEY are the ones to avoid printing.
*/
static int is_reserved_key(const char *key, size_t size)
{
if (size < SYSTEM_PVFS2_KEY_LEN)
return 1;
return strncmp(key, SYSTEM_PVFS2_KEY, SYSTEM_PVFS2_KEY_LEN) ? 1 : 0;
}
static inline int convert_to_internal_xattr_flags(int setxattr_flags)
{
int internal_flag = 0;
if (setxattr_flags & XATTR_REPLACE) {
/* Attribute must exist! */
internal_flag = PVFS_XATTR_REPLACE;
} else if (setxattr_flags & XATTR_CREATE) {
/* Attribute must not exist */
internal_flag = PVFS_XATTR_CREATE;
}
return internal_flag;
}
/*
* Tries to get a specified key's attributes of a given
* file into a user-specified buffer. Note that the getxattr
* interface allows for the users to probe the size of an
* extended attribute by passing in a value of 0 to size.
* Thus our return value is always the size of the attribute
* unless the key does not exist for the file and/or if
* there were errors in fetching the attribute value.
*/
ssize_t pvfs2_inode_getxattr(struct inode *inode, const char *prefix,
const char *name, void *buffer, size_t size)
{
struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
struct pvfs2_kernel_op_s *new_op = NULL;
ssize_t ret = -ENOMEM;
ssize_t length = 0;
int fsuid;
int fsgid;
gossip_debug(GOSSIP_XATTR_DEBUG,
"%s: prefix %s name %s, buffer_size %zd\n",
__func__, prefix, name, size);
if (name == NULL || (size > 0 && buffer == NULL)) {
gossip_err("pvfs2_inode_getxattr: bogus NULL pointers\n");
return -EINVAL;
}
if (size < 0 ||
(strlen(name) + strlen(prefix)) >= PVFS_MAX_XATTR_NAMELEN) {
gossip_err("Invalid size (%d) or key length (%d)\n",
(int)size,
(int)(strlen(name) + strlen(prefix)));
return -EINVAL;
}
fsuid = from_kuid(current_user_ns(), current_fsuid());
fsgid = from_kgid(current_user_ns(), current_fsgid());
gossip_debug(GOSSIP_XATTR_DEBUG,
"getxattr on inode %pU, name %s "
"(uid %o, gid %o)\n",
get_khandle_from_ino(inode),
name,
fsuid,
fsgid);
down_read(&pvfs2_inode->xattr_sem);
new_op = op_alloc(PVFS2_VFS_OP_GETXATTR);
if (!new_op)
goto out_unlock;
new_op->upcall.req.getxattr.refn = pvfs2_inode->refn;
ret = snprintf((char *)new_op->upcall.req.getxattr.key,
PVFS_MAX_XATTR_NAMELEN, "%s%s", prefix, name);
/*
* NOTE: Although keys are meant to be NULL terminated textual
* strings, I am going to explicitly pass the length just in case
* we change this later on...
*/
new_op->upcall.req.getxattr.key_sz = ret + 1;
ret = service_operation(new_op, "pvfs2_inode_getxattr",
get_interruptible_flag(inode));
if (ret != 0) {
if (ret == -ENOENT) {
ret = -ENODATA;
gossip_debug(GOSSIP_XATTR_DEBUG,
"pvfs2_inode_getxattr: inode %pU key %s"
" does not exist!\n",
get_khandle_from_ino(inode),
(char *)new_op->upcall.req.getxattr.key);
}
goto out_release_op;
}
/*
* Length returned includes null terminator.
*/
length = new_op->downcall.resp.getxattr.val_sz;
/*
* Just return the length of the queried attribute.
*/
if (size == 0) {
ret = length;
goto out_release_op;
}
/*
* Check to see if key length is > provided buffer size.
*/
if (length > size) {
ret = -ERANGE;
goto out_release_op;
}
memset(buffer, 0, size);
memcpy(buffer, new_op->downcall.resp.getxattr.val, length);
gossip_debug(GOSSIP_XATTR_DEBUG,
"pvfs2_inode_getxattr: inode %pU "
"key %s key_sz %d, val_len %d\n",
get_khandle_from_ino(inode),
(char *)new_op->
upcall.req.getxattr.key,
(int)new_op->
upcall.req.getxattr.key_sz,
(int)ret);
ret = length;
out_release_op:
op_release(new_op);
out_unlock:
up_read(&pvfs2_inode->xattr_sem);
return ret;
}
static int pvfs2_inode_removexattr(struct inode *inode,
const char *prefix,
const char *name,
int flags)
{
struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
struct pvfs2_kernel_op_s *new_op = NULL;
int ret = -ENOMEM;
down_write(&pvfs2_inode->xattr_sem);
new_op = op_alloc(PVFS2_VFS_OP_REMOVEXATTR);
if (!new_op)
goto out_unlock;
new_op->upcall.req.removexattr.refn = pvfs2_inode->refn;
/*
* NOTE: Although keys are meant to be NULL terminated
* textual strings, I am going to explicitly pass the
* length just in case we change this later on...
*/
ret = snprintf((char *)new_op->upcall.req.removexattr.key,
PVFS_MAX_XATTR_NAMELEN,
"%s%s",
(prefix ? prefix : ""),
name);
new_op->upcall.req.removexattr.key_sz = ret + 1;
gossip_debug(GOSSIP_XATTR_DEBUG,
"pvfs2_inode_removexattr: key %s, key_sz %d\n",
(char *)new_op->upcall.req.removexattr.key,
(int)new_op->upcall.req.removexattr.key_sz);
ret = service_operation(new_op,
"pvfs2_inode_removexattr",
get_interruptible_flag(inode));
if (ret == -ENOENT) {
/*
* Request to replace a non-existent attribute is an error.
*/
if (flags & XATTR_REPLACE)
ret = -ENODATA;
else
ret = 0;
}
gossip_debug(GOSSIP_XATTR_DEBUG,
"pvfs2_inode_removexattr: returning %d\n", ret);
op_release(new_op);
out_unlock:
up_write(&pvfs2_inode->xattr_sem);
return ret;
}
/*
* Tries to set an attribute for a given key on a file.
*
* Returns a -ve number on error and 0 on success. Key is text, but value
* can be binary!
*/
int pvfs2_inode_setxattr(struct inode *inode, const char *prefix,
const char *name, const void *value, size_t size, int flags)
{
struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
struct pvfs2_kernel_op_s *new_op;
int internal_flag = 0;
int ret = -ENOMEM;
gossip_debug(GOSSIP_XATTR_DEBUG,
"%s: prefix %s, name %s, buffer_size %zd\n",
__func__, prefix, name, size);
if (size < 0 ||
size >= PVFS_MAX_XATTR_VALUELEN ||
flags < 0) {
gossip_err("pvfs2_inode_setxattr: bogus values of size(%d), flags(%d)\n",
(int)size,
flags);
return -EINVAL;
}
if (name == NULL ||
(size > 0 && value == NULL)) {
gossip_err("pvfs2_inode_setxattr: bogus NULL pointers!\n");
return -EINVAL;
}
internal_flag = convert_to_internal_xattr_flags(flags);
if (prefix) {
if (strlen(name) + strlen(prefix) >= PVFS_MAX_XATTR_NAMELEN) {
gossip_err
("pvfs2_inode_setxattr: bogus key size (%d)\n",
(int)(strlen(name) + strlen(prefix)));
return -EINVAL;
}
} else {
if (strlen(name) >= PVFS_MAX_XATTR_NAMELEN) {
gossip_err
("pvfs2_inode_setxattr: bogus key size (%d)\n",
(int)(strlen(name)));
return -EINVAL;
}
}
/* This is equivalent to a removexattr */
if (size == 0 && value == NULL) {
gossip_debug(GOSSIP_XATTR_DEBUG,
"removing xattr (%s%s)\n",
prefix,
name);
return pvfs2_inode_removexattr(inode, prefix, name, flags);
}
gossip_debug(GOSSIP_XATTR_DEBUG,
"setxattr on inode %pU, name %s\n",
get_khandle_from_ino(inode),
name);
down_write(&pvfs2_inode->xattr_sem);
new_op = op_alloc(PVFS2_VFS_OP_SETXATTR);
if (!new_op)
goto out_unlock;
new_op->upcall.req.setxattr.refn = pvfs2_inode->refn;
new_op->upcall.req.setxattr.flags = internal_flag;
/*
* NOTE: Although keys are meant to be NULL terminated textual
* strings, I am going to explicitly pass the length just in
* case we change this later on...
*/
ret = snprintf((char *)new_op->upcall.req.setxattr.keyval.key,
PVFS_MAX_XATTR_NAMELEN,
"%s%s",
prefix, name);
new_op->upcall.req.setxattr.keyval.key_sz = ret + 1;
memcpy(new_op->upcall.req.setxattr.keyval.val, value, size);
new_op->upcall.req.setxattr.keyval.val_sz = size;
gossip_debug(GOSSIP_XATTR_DEBUG,
"pvfs2_inode_setxattr: key %s, key_sz %d "
" value size %zd\n",
(char *)new_op->upcall.req.setxattr.keyval.key,
(int)new_op->upcall.req.setxattr.keyval.key_sz,
size);
ret = service_operation(new_op,
"pvfs2_inode_setxattr",
get_interruptible_flag(inode));
gossip_debug(GOSSIP_XATTR_DEBUG,
"pvfs2_inode_setxattr: returning %d\n",
ret);
/* when request is serviced properly, free req op struct */
op_release(new_op);
out_unlock:
up_write(&pvfs2_inode->xattr_sem);
return ret;
}
/*
* Tries to get a specified object's keys into a user-specified buffer of a
* given size. Note that like the previous instances of xattr routines, this
* also allows you to pass in a NULL pointer and 0 size to probe the size for
* subsequent memory allocations. Thus our return value is always the size of
* all the keys unless there were errors in fetching the keys!
*/
ssize_t pvfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
struct inode *inode = dentry->d_inode;
struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
struct pvfs2_kernel_op_s *new_op;
__u64 token = PVFS_ITERATE_START;
ssize_t ret = -ENOMEM;
ssize_t total = 0;
ssize_t length = 0;
int count_keys = 0;
int key_size;
int i = 0;
if (size > 0 && buffer == NULL) {
gossip_err("%s: bogus NULL pointers\n", __func__);
return -EINVAL;
}
if (size < 0) {
gossip_err("Invalid size (%d)\n", (int)size);
return -EINVAL;
}
down_read(&pvfs2_inode->xattr_sem);
new_op = op_alloc(PVFS2_VFS_OP_LISTXATTR);
if (!new_op)
goto out_unlock;
if (buffer && size > 0)
memset(buffer, 0, size);
try_again:
key_size = 0;
new_op->upcall.req.listxattr.refn = pvfs2_inode->refn;
new_op->upcall.req.listxattr.token = token;
new_op->upcall.req.listxattr.requested_count =
(size == 0) ? 0 : PVFS_MAX_XATTR_LISTLEN;
ret = service_operation(new_op, __func__,
get_interruptible_flag(inode));
if (ret != 0)
goto done;
if (size == 0) {
/*
* This is a bit of a big upper limit, but I did not want to
* spend too much time getting this correct, since users end
* up allocating memory rather than us...
*/
total = new_op->downcall.resp.listxattr.returned_count *
PVFS_MAX_XATTR_NAMELEN;
goto done;
}
length = new_op->downcall.resp.listxattr.keylen;
if (length == 0)
goto done;
/*
* Check to see how much can be fit in the buffer. Fit only whole keys.
*/
for (i = 0; i < new_op->downcall.resp.listxattr.returned_count; i++) {
if (total + new_op->downcall.resp.listxattr.lengths[i] > size)
goto done;
/*
* Since many dumb programs try to setxattr() on our reserved
* xattrs this is a feeble attempt at defeating those by not
* listing them in the output of listxattr.. sigh
*/
if (is_reserved_key(new_op->downcall.resp.listxattr.key +
key_size,
new_op->downcall.resp.
listxattr.lengths[i])) {
gossip_debug(GOSSIP_XATTR_DEBUG, "Copying key %d -> %s\n",
i, new_op->downcall.resp.listxattr.key +
key_size);
memcpy(buffer + total,
new_op->downcall.resp.listxattr.key + key_size,
new_op->downcall.resp.listxattr.lengths[i]);
total += new_op->downcall.resp.listxattr.lengths[i];
count_keys++;
} else {
gossip_debug(GOSSIP_XATTR_DEBUG, "[RESERVED] key %d -> %s\n",
i, new_op->downcall.resp.listxattr.key +
key_size);
}
key_size += new_op->downcall.resp.listxattr.lengths[i];
}
/*
* Since the buffer was large enough, we might have to continue
* fetching more keys!
*/
token = new_op->downcall.resp.listxattr.token;
if (token != PVFS_ITERATE_END)
goto try_again;
done:
gossip_debug(GOSSIP_XATTR_DEBUG, "%s: returning %d"
" [size of buffer %ld] (filled in %d keys)\n",
__func__,
ret ? (int)ret : (int)total,
(long)size,
count_keys);
op_release(new_op);
if (ret == 0)
ret = total;
out_unlock:
up_read(&pvfs2_inode->xattr_sem);
return ret;
}
int pvfs2_xattr_set_default(struct dentry *dentry,
const char *name,
const void *buffer,
size_t size,
int flags,
int handler_flags)
{
return pvfs2_inode_setxattr(dentry->d_inode,
PVFS2_XATTR_NAME_DEFAULT_PREFIX,
name,
buffer,
size,
flags);
}
int pvfs2_xattr_get_default(struct dentry *dentry,
const char *name,
void *buffer,
size_t size,
int handler_flags)
{
return pvfs2_inode_getxattr(dentry->d_inode,
PVFS2_XATTR_NAME_DEFAULT_PREFIX,
name,
buffer,
size);
}
static int pvfs2_xattr_set_trusted(struct dentry *dentry,
const char *name,
const void *buffer,
size_t size,
int flags,
int handler_flags)
{
return pvfs2_inode_setxattr(dentry->d_inode,
PVFS2_XATTR_NAME_TRUSTED_PREFIX,
name,
buffer,
size,
flags);
}
static int pvfs2_xattr_get_trusted(struct dentry *dentry,
const char *name,
void *buffer,
size_t size,
int handler_flags)
{
return pvfs2_inode_getxattr(dentry->d_inode,
PVFS2_XATTR_NAME_TRUSTED_PREFIX,
name,
buffer,
size);
}
static struct xattr_handler pvfs2_xattr_trusted_handler = {
.prefix = PVFS2_XATTR_NAME_TRUSTED_PREFIX,
.get = pvfs2_xattr_get_trusted,
.set = pvfs2_xattr_set_trusted,
};
static struct xattr_handler pvfs2_xattr_default_handler = {
/*
* NOTE: this is set to be the empty string.
* so that all un-prefixed xattrs keys get caught
* here!
*/
.prefix = PVFS2_XATTR_NAME_DEFAULT_PREFIX,
.get = pvfs2_xattr_get_default,
.set = pvfs2_xattr_set_default,
};
const struct xattr_handler *pvfs2_xattr_handlers[] = {
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
&pvfs2_xattr_trusted_handler,
&pvfs2_xattr_default_handler,
NULL
};