mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Pull Ceph updates from Sage Weil: "There is some follow-on RBD cleanup after the last window's code drop, a series from Yan fixing multi-mds behavior in cephfs, and then a sprinkling of bug fixes all around. Some warnings, sleeping while atomic, a null dereference, and cleanups" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (36 commits) libceph: fix invalid unsigned->signed conversion for timespec encoding libceph: call r_unsafe_callback when unsafe reply is received ceph: fix race between cap issue and revoke ceph: fix cap revoke race ceph: fix pending vmtruncate race ceph: avoid accessing invalid memory libceph: Fix NULL pointer dereference in auth client code ceph: Reconstruct the func ceph_reserve_caps. ceph: Free mdsc if alloc mdsc->mdsmap failed. ceph: remove sb_start/end_write in ceph_aio_write. ceph: avoid meaningless calling ceph_caps_revoking if sync_mode == WB_SYNC_ALL. ceph: fix sleeping function called from invalid context. ceph: move inode to proper flushing list when auth MDS changes rbd: fix a couple warnings ceph: clear migrate seq when MDS restarts ceph: check migrate seq before changing auth cap ceph: fix race between page writeback and truncate ceph: reset iov_len when discarding cap release messages ceph: fix cap release race libceph: fix truncate size calculation ...
307 lines
8.1 KiB
C
307 lines
8.1 KiB
C
#include <linux/ceph/ceph_debug.h>
|
|
|
|
#include <linux/file.h>
|
|
#include <linux/namei.h>
|
|
|
|
#include "super.h"
|
|
#include "mds_client.h"
|
|
#include <linux/ceph/pagelist.h>
|
|
|
|
/**
|
|
* Implement fcntl and flock locking functions.
|
|
*/
|
|
static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
|
|
int cmd, u8 wait, struct file_lock *fl)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct ceph_mds_client *mdsc =
|
|
ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int err;
|
|
u64 length = 0;
|
|
|
|
req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
req->r_inode = inode;
|
|
ihold(inode);
|
|
|
|
/* mds requires start and length rather than start and end */
|
|
if (LLONG_MAX == fl->fl_end)
|
|
length = 0;
|
|
else
|
|
length = fl->fl_end - fl->fl_start + 1;
|
|
|
|
dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
|
|
"length: %llu, wait: %d, type: %d", (int)lock_type,
|
|
(int)operation, (u64)fl->fl_pid, fl->fl_start,
|
|
length, wait, fl->fl_type);
|
|
|
|
req->r_args.filelock_change.rule = lock_type;
|
|
req->r_args.filelock_change.type = cmd;
|
|
req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid);
|
|
/* This should be adjusted, but I'm not sure if
|
|
namespaces actually get id numbers*/
|
|
req->r_args.filelock_change.pid_namespace =
|
|
cpu_to_le64((u64)(unsigned long)fl->fl_nspid);
|
|
req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start);
|
|
req->r_args.filelock_change.length = cpu_to_le64(length);
|
|
req->r_args.filelock_change.wait = wait;
|
|
|
|
err = ceph_mdsc_do_request(mdsc, inode, req);
|
|
|
|
if ( operation == CEPH_MDS_OP_GETFILELOCK){
|
|
fl->fl_pid = le64_to_cpu(req->r_reply_info.filelock_reply->pid);
|
|
if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type)
|
|
fl->fl_type = F_RDLCK;
|
|
else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type)
|
|
fl->fl_type = F_WRLCK;
|
|
else
|
|
fl->fl_type = F_UNLCK;
|
|
|
|
fl->fl_start = le64_to_cpu(req->r_reply_info.filelock_reply->start);
|
|
length = le64_to_cpu(req->r_reply_info.filelock_reply->start) +
|
|
le64_to_cpu(req->r_reply_info.filelock_reply->length);
|
|
if (length >= 1)
|
|
fl->fl_end = length -1;
|
|
else
|
|
fl->fl_end = 0;
|
|
|
|
}
|
|
ceph_mdsc_put_request(req);
|
|
dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
|
|
"length: %llu, wait: %d, type: %d, err code %d", (int)lock_type,
|
|
(int)operation, (u64)fl->fl_pid, fl->fl_start,
|
|
length, wait, fl->fl_type, err);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* Attempt to set an fcntl lock.
|
|
* For now, this just goes away to the server. Later it may be more awesome.
|
|
*/
|
|
int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
u8 lock_cmd;
|
|
int err;
|
|
u8 wait = 0;
|
|
u16 op = CEPH_MDS_OP_SETFILELOCK;
|
|
|
|
fl->fl_nspid = get_pid(task_tgid(current));
|
|
dout("ceph_lock, fl_pid:%d", fl->fl_pid);
|
|
|
|
/* set wait bit as appropriate, then make command as Ceph expects it*/
|
|
if (F_SETLKW == cmd)
|
|
wait = 1;
|
|
if (F_GETLK == cmd)
|
|
op = CEPH_MDS_OP_GETFILELOCK;
|
|
|
|
if (F_RDLCK == fl->fl_type)
|
|
lock_cmd = CEPH_LOCK_SHARED;
|
|
else if (F_WRLCK == fl->fl_type)
|
|
lock_cmd = CEPH_LOCK_EXCL;
|
|
else
|
|
lock_cmd = CEPH_LOCK_UNLOCK;
|
|
|
|
err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl);
|
|
if (!err) {
|
|
if ( op != CEPH_MDS_OP_GETFILELOCK ){
|
|
dout("mds locked, locking locally");
|
|
err = posix_lock_file(file, fl, NULL);
|
|
if (err && (CEPH_MDS_OP_SETFILELOCK == op)) {
|
|
/* undo! This should only happen if
|
|
* the kernel detects local
|
|
* deadlock. */
|
|
ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
|
|
CEPH_LOCK_UNLOCK, 0, fl);
|
|
dout("got %d on posix_lock_file, undid lock",
|
|
err);
|
|
}
|
|
}
|
|
|
|
} else if (err == -ERESTARTSYS) {
|
|
dout("undoing lock\n");
|
|
ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
|
|
CEPH_LOCK_UNLOCK, 0, fl);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
u8 lock_cmd;
|
|
int err;
|
|
u8 wait = 1;
|
|
|
|
fl->fl_nspid = get_pid(task_tgid(current));
|
|
dout("ceph_flock, fl_pid:%d", fl->fl_pid);
|
|
|
|
/* set wait bit, then clear it out of cmd*/
|
|
if (cmd & LOCK_NB)
|
|
wait = 0;
|
|
cmd = cmd & (LOCK_SH | LOCK_EX | LOCK_UN);
|
|
/* set command sequence that Ceph wants to see:
|
|
shared lock, exclusive lock, or unlock */
|
|
if (LOCK_SH == cmd)
|
|
lock_cmd = CEPH_LOCK_SHARED;
|
|
else if (LOCK_EX == cmd)
|
|
lock_cmd = CEPH_LOCK_EXCL;
|
|
else
|
|
lock_cmd = CEPH_LOCK_UNLOCK;
|
|
|
|
err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK,
|
|
file, lock_cmd, wait, fl);
|
|
if (!err) {
|
|
err = flock_lock_file_wait(file, fl);
|
|
if (err) {
|
|
ceph_lock_message(CEPH_LOCK_FLOCK,
|
|
CEPH_MDS_OP_SETFILELOCK,
|
|
file, CEPH_LOCK_UNLOCK, 0, fl);
|
|
dout("got %d on flock_lock_file_wait, undid lock", err);
|
|
}
|
|
} else if (err == -ERESTARTSYS) {
|
|
dout("undoing lock\n");
|
|
ceph_lock_message(CEPH_LOCK_FLOCK,
|
|
CEPH_MDS_OP_SETFILELOCK,
|
|
file, CEPH_LOCK_UNLOCK, 0, fl);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* Must be called with lock_flocks() already held. Fills in the passed
|
|
* counter variables, so you can prepare pagelist metadata before calling
|
|
* ceph_encode_locks.
|
|
*/
|
|
void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
|
|
{
|
|
struct file_lock *lock;
|
|
|
|
*fcntl_count = 0;
|
|
*flock_count = 0;
|
|
|
|
for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
|
|
if (lock->fl_flags & FL_POSIX)
|
|
++(*fcntl_count);
|
|
else if (lock->fl_flags & FL_FLOCK)
|
|
++(*flock_count);
|
|
}
|
|
dout("counted %d flock locks and %d fcntl locks",
|
|
*flock_count, *fcntl_count);
|
|
}
|
|
|
|
/**
|
|
* Encode the flock and fcntl locks for the given inode into the ceph_filelock
|
|
* array. Must be called with inode->i_lock already held.
|
|
* If we encounter more of a specific lock type than expected, return -ENOSPC.
|
|
*/
|
|
int ceph_encode_locks_to_buffer(struct inode *inode,
|
|
struct ceph_filelock *flocks,
|
|
int num_fcntl_locks, int num_flock_locks)
|
|
{
|
|
struct file_lock *lock;
|
|
int err = 0;
|
|
int seen_fcntl = 0;
|
|
int seen_flock = 0;
|
|
int l = 0;
|
|
|
|
dout("encoding %d flock and %d fcntl locks", num_flock_locks,
|
|
num_fcntl_locks);
|
|
|
|
for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
|
|
if (lock->fl_flags & FL_POSIX) {
|
|
++seen_fcntl;
|
|
if (seen_fcntl > num_fcntl_locks) {
|
|
err = -ENOSPC;
|
|
goto fail;
|
|
}
|
|
err = lock_to_ceph_filelock(lock, &flocks[l]);
|
|
if (err)
|
|
goto fail;
|
|
++l;
|
|
}
|
|
}
|
|
for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
|
|
if (lock->fl_flags & FL_FLOCK) {
|
|
++seen_flock;
|
|
if (seen_flock > num_flock_locks) {
|
|
err = -ENOSPC;
|
|
goto fail;
|
|
}
|
|
err = lock_to_ceph_filelock(lock, &flocks[l]);
|
|
if (err)
|
|
goto fail;
|
|
++l;
|
|
}
|
|
}
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* Copy the encoded flock and fcntl locks into the pagelist.
|
|
* Format is: #fcntl locks, sequential fcntl locks, #flock locks,
|
|
* sequential flock locks.
|
|
* Returns zero on success.
|
|
*/
|
|
int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
|
|
struct ceph_pagelist *pagelist,
|
|
int num_fcntl_locks, int num_flock_locks)
|
|
{
|
|
int err = 0;
|
|
__le32 nlocks;
|
|
|
|
nlocks = cpu_to_le32(num_fcntl_locks);
|
|
err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
err = ceph_pagelist_append(pagelist, flocks,
|
|
num_fcntl_locks * sizeof(*flocks));
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
nlocks = cpu_to_le32(num_flock_locks);
|
|
err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
err = ceph_pagelist_append(pagelist,
|
|
&flocks[num_fcntl_locks],
|
|
num_flock_locks * sizeof(*flocks));
|
|
out_fail:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Given a pointer to a lock, convert it to a ceph filelock
|
|
*/
|
|
int lock_to_ceph_filelock(struct file_lock *lock,
|
|
struct ceph_filelock *cephlock)
|
|
{
|
|
int err = 0;
|
|
|
|
cephlock->start = cpu_to_le64(lock->fl_start);
|
|
cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1);
|
|
cephlock->client = cpu_to_le64(0);
|
|
cephlock->pid = cpu_to_le64(lock->fl_pid);
|
|
cephlock->pid_namespace =
|
|
cpu_to_le64((u64)(unsigned long)lock->fl_nspid);
|
|
|
|
switch (lock->fl_type) {
|
|
case F_RDLCK:
|
|
cephlock->type = CEPH_LOCK_SHARED;
|
|
break;
|
|
case F_WRLCK:
|
|
cephlock->type = CEPH_LOCK_EXCL;
|
|
break;
|
|
case F_UNLCK:
|
|
cephlock->type = CEPH_LOCK_UNLOCK;
|
|
break;
|
|
default:
|
|
dout("Have unknown lock type %d", lock->fl_type);
|
|
err = -EINVAL;
|
|
}
|
|
|
|
return err;
|
|
}
|