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locks: convert posix locks to file_lock_context 

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Acked-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jeff Layton 2015-01-16 15:05:55 -05:00 committed by Jeff Layton
parent 5263e31e45
commit bd61e0a9c8
11 changed files with 158 additions and 201 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
fs/ceph/locks.c
View File

@ -253,18 +253,15 @@ void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
*fcntl_count = 0;
*flock_count = 0;
spin_lock(&inode->i_lock);
for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
if (lock->fl_flags & FL_POSIX)
++(*fcntl_count);
}
ctx = inode->i_flctx;
if (ctx) {
spin_lock(&inode->i_lock);
list_for_each_entry(lock, &ctx->flc_posix, fl_list)
++(*fcntl_count);
list_for_each_entry(lock, &ctx->flc_flock, fl_list)
++(*flock_count);
spin_unlock(&inode->i_lock);
}
spin_unlock(&inode->i_lock);
dout("counted %d flock locks and %d fcntl locks",
*flock_count, *fcntl_count);
}
@ -279,7 +276,7 @@ int ceph_encode_locks_to_buffer(struct inode *inode,
int num_fcntl_locks, int num_flock_locks)
{
struct file_lock *lock;
struct file_lock_context *ctx;
struct file_lock_context *ctx = inode->i_flctx;
int err = 0;
int seen_fcntl = 0;
int seen_flock = 0;
@ -288,34 +285,31 @@ int ceph_encode_locks_to_buffer(struct inode *inode,
dout("encoding %d flock and %d fcntl locks", num_flock_locks,
num_fcntl_locks);
spin_lock(&inode->i_lock);
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;
}
}
if (!ctx)
return 0;
ctx = inode->i_flctx;
if (ctx) {
list_for_each_entry(lock, &ctx->flc_flock, fl_list) {
++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;
spin_lock(&inode->i_lock);
list_for_each_entry(lock, &ctx->flc_flock, fl_list) {
++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;
}
list_for_each_entry(lock, &ctx->flc_flock, fl_list) {
++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:
spin_unlock(&inode->i_lock);

26
fs/cifs/file.c
View File

@ -1109,11 +1109,6 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
return rc;
}
/* copied from fs/locks.c with a name change */
#define cifs_for_each_lock(inode, lockp) \
for (lockp = &inode->i_flock; *lockp != NULL; \
lockp = &(*lockp)->fl_next)
struct lock_to_push {
struct list_head llist;
__u64 offset;
@ -1128,8 +1123,9 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
{
struct inode *inode = cfile->dentry->d_inode;
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
struct file_lock *flock, **before;
unsigned int count = 0, i = 0;
struct file_lock *flock;
struct file_lock_context *flctx = inode->i_flctx;
unsigned int count = 0, i;
int rc = 0, xid, type;
struct list_head locks_to_send, *el;
struct lock_to_push *lck, *tmp;
@ -1137,10 +1133,12 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
xid = get_xid();
if (!flctx)
goto out;
spin_lock(&inode->i_lock);
cifs_for_each_lock(inode, before) {
if ((*before)->fl_flags & FL_POSIX)
count++;
list_for_each(el, &flctx->flc_posix) {
count++;
}
spin_unlock(&inode->i_lock);
@ -1151,7 +1149,7 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
* added to the list while we are holding cinode->lock_sem that
* protects locking operations of this inode.
*/
for (; i < count; i++) {
for (i = 0; i < count; i++) {
lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);
if (!lck) {
rc = -ENOMEM;
@ -1162,10 +1160,7 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
el = locks_to_send.next;
spin_lock(&inode->i_lock);
cifs_for_each_lock(inode, before) {
flock = *before;
if ((flock->fl_flags & FL_POSIX) == 0)
continue;
list_for_each_entry(flock, &flctx->flc_posix, fl_list) {
if (el == &locks_to_send) {
/*
* The list ended. We don't have enough allocated
@ -1185,7 +1180,6 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
lck->length = length;
lck->type = type;
lck->offset = flock->fl_start;
el = el->next;
}
spin_unlock(&inode->i_lock);

20
fs/lockd/svcsubs.c
View File

@ -164,12 +164,15 @@ nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
{
struct inode *inode = nlmsvc_file_inode(file);
struct file_lock *fl;
struct file_lock_context *flctx = inode->i_flctx;
struct nlm_host *lockhost;
if (!flctx || list_empty_careful(&flctx->flc_posix))
return 0;
again:
file->f_locks = 0;
spin_lock(&inode->i_lock);
for (fl = inode->i_flock; fl; fl = fl->fl_next) {
list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
if (fl->fl_lmops != &nlmsvc_lock_operations)
continue;
@ -223,18 +226,21 @@ nlm_file_inuse(struct nlm_file *file)
{
struct inode *inode = nlmsvc_file_inode(file);
struct file_lock *fl;
struct file_lock_context *flctx = inode->i_flctx;
if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
return 1;
spin_lock(&inode->i_lock);
for (fl = inode->i_flock; fl; fl = fl->fl_next) {
if (fl->fl_lmops == &nlmsvc_lock_operations) {
spin_unlock(&inode->i_lock);
return 1;
if (flctx && !list_empty_careful(&flctx->flc_posix)) {
spin_lock(&inode->i_lock);
list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
if (fl->fl_lmops == &nlmsvc_lock_operations) {
spin_unlock(&inode->i_lock);
return 1;
}
}
spin_unlock(&inode->i_lock);
}
spin_unlock(&inode->i_lock);
file->f_locks = 0;
return 0;
}

110
fs/locks.c
View File

@ -157,9 +157,6 @@ static int target_leasetype(struct file_lock *fl)
int leases_enable = 1;
int lease_break_time = 45;
#define for_each_lock(inode, lockp) \
for (lockp = &inode->i_flock; *lockp != NULL; lockp = &(*lockp)->fl_next)
/*
* The global file_lock_list is only used for displaying /proc/locks, so we
* keep a list on each CPU, with each list protected by its own spinlock via
@ -218,6 +215,7 @@ locks_get_lock_context(struct inode *inode)
goto out;
INIT_LIST_HEAD(&new->flc_flock);
INIT_LIST_HEAD(&new->flc_posix);
/*
* Assign the pointer if it's not already assigned. If it is, then
@ -241,6 +239,7 @@ locks_free_lock_context(struct file_lock_context *ctx)
{
if (ctx) {
WARN_ON_ONCE(!list_empty(&ctx->flc_flock));
WARN_ON_ONCE(!list_empty(&ctx->flc_posix));
kmem_cache_free(flctx_cache, ctx);
}
}
@ -809,21 +808,26 @@ void
posix_test_lock(struct file *filp, struct file_lock *fl)
{
struct file_lock *cfl;
struct file_lock_context *ctx;
struct inode *inode = file_inode(filp);
spin_lock(&inode->i_lock);
for (cfl = file_inode(filp)->i_flock; cfl; cfl = cfl->fl_next) {
if (!IS_POSIX(cfl))
continue;
if (posix_locks_conflict(fl, cfl))
break;
}
if (cfl) {
locks_copy_conflock(fl, cfl);
if (cfl->fl_nspid)
fl->fl_pid = pid_vnr(cfl->fl_nspid);
} else
ctx = inode->i_flctx;
if (!ctx || list_empty_careful(&ctx->flc_posix)) {
fl->fl_type = F_UNLCK;
return;
}
spin_lock(&inode->i_lock);
list_for_each_entry(cfl, &ctx->flc_posix, fl_list) {
if (posix_locks_conflict(fl, cfl)) {
locks_copy_conflock(fl, cfl);
if (cfl->fl_nspid)
fl->fl_pid = pid_vnr(cfl->fl_nspid);
goto out;
}
}
fl->fl_type = F_UNLCK;
out:
spin_unlock(&inode->i_lock);
return;
}
@ -983,16 +987,20 @@ out:
static int __posix_lock_file(struct inode *inode, struct file_lock *request, struct file_lock *conflock)
{
struct file_lock *fl;
struct file_lock *fl, *tmp;
struct file_lock *new_fl = NULL;
struct file_lock *new_fl2 = NULL;
struct file_lock *left = NULL;
struct file_lock *right = NULL;
struct file_lock **before;
struct file_lock_context *ctx;
int error;
bool added = false;
LIST_HEAD(dispose);
ctx = locks_get_lock_context(inode);
if (!ctx)
return -ENOMEM;
/*
* We may need two file_lock structures for this operation,
* so we get them in advance to avoid races.
@ -1013,8 +1021,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
* blocker's list of waiters and the global blocked_hash.
*/
if (request->fl_type != F_UNLCK) {
for_each_lock(inode, before) {
fl = *before;
list_for_each_entry(fl, &ctx->flc_posix, fl_list) {
if (!IS_POSIX(fl))
continue;
if (!posix_locks_conflict(request, fl))
@ -1044,29 +1051,25 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
if (request->fl_flags & FL_ACCESS)
goto out;
/*
* Find the first old lock with the same owner as the new lock.
*/
before = &inode->i_flock;
/* First skip locks owned by other processes. */
while ((fl = *before) && (!IS_POSIX(fl) ||
!posix_same_owner(request, fl))) {
before = &fl->fl_next;
/* Find the first old lock with the same owner as the new lock */
list_for_each_entry(fl, &ctx->flc_posix, fl_list) {
if (posix_same_owner(request, fl))
break;
}
/* Process locks with this owner. */
while ((fl = *before) && posix_same_owner(request, fl)) {
/* Detect adjacent or overlapping regions (if same lock type)
*/
list_for_each_entry_safe_from(fl, tmp, &ctx->flc_posix, fl_list) {
if (!posix_same_owner(request, fl))
break;
/* Detect adjacent or overlapping regions (if same lock type) */
if (request->fl_type == fl->fl_type) {
/* In all comparisons of start vs end, use
* "start - 1" rather than "end + 1". If end
* is OFFSET_MAX, end + 1 will become negative.
*/
if (fl->fl_end < request->fl_start - 1)
goto next_lock;
continue;
/* If the next lock in the list has entirely bigger
* addresses than the new one, insert the lock here.
*/
@ -1087,18 +1090,17 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
else
request->fl_end = fl->fl_end;
if (added) {
locks_delete_lock(before, &dispose);
locks_delete_lock_ctx(fl, &dispose);
continue;
}
request = fl;
added = true;
}
else {
} else {
/* Processing for different lock types is a bit
* more complex.
*/
if (fl->fl_end < request->fl_start)
goto next_lock;
continue;
if (fl->fl_start > request->fl_end)
break;
if (request->fl_type == F_UNLCK)
@ -1117,7 +1119,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
* one (This may happen several times).
*/
if (added) {
locks_delete_lock(before, &dispose);
locks_delete_lock_ctx(fl, &dispose);
continue;
}
/*
@ -1133,15 +1135,11 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
locks_copy_lock(new_fl, request);
request = new_fl;
new_fl = NULL;
locks_delete_lock(before, &dispose);
locks_insert_lock(before, request);
locks_insert_lock_ctx(request, &fl->fl_list);
locks_delete_lock_ctx(fl, &dispose);
added = true;
}
}
/* Go on to next lock.
*/
next_lock:
before = &fl->fl_next;
}
/*
@ -1166,7 +1164,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
goto out;
}
locks_copy_lock(new_fl, request);
locks_insert_lock(before, new_fl);
locks_insert_lock_ctx(new_fl, &fl->fl_list);
new_fl = NULL;
}
if (right) {
@ -1177,7 +1175,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
left = new_fl2;
new_fl2 = NULL;
locks_copy_lock(left, right);
locks_insert_lock(before, left);
locks_insert_lock_ctx(left, &fl->fl_list);
}
right->fl_start = request->fl_end + 1;
locks_wake_up_blocks(right);
@ -1257,22 +1255,29 @@ EXPORT_SYMBOL(posix_lock_file_wait);
*/
int locks_mandatory_locked(struct file *file)
{
int ret;
struct inode *inode = file_inode(file);
struct file_lock_context *ctx;
struct file_lock *fl;
ctx = inode->i_flctx;
if (!ctx || list_empty_careful(&ctx->flc_posix))
return 0;
/*
* Search the lock list for this inode for any POSIX locks.
*/
spin_lock(&inode->i_lock);
for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
if (!IS_POSIX(fl))
continue;
ret = 0;
list_for_each_entry(fl, &ctx->flc_posix, fl_list) {
if (fl->fl_owner != current->files &&
fl->fl_owner != file)
fl->fl_owner != file) {
ret = -EAGAIN;
break;
}
}
spin_unlock(&inode->i_lock);
return fl ? -EAGAIN : 0;
return ret;
}
/**
@ -2389,13 +2394,14 @@ out:
void locks_remove_posix(struct file *filp, fl_owner_t owner)
{
struct file_lock lock;
struct file_lock_context *ctx = file_inode(filp)->i_flctx;
/*
* If there are no locks held on this file, we don't need to call
* posix_lock_file(). Another process could be setting a lock on this
* file at the same time, but we wouldn't remove that lock anyway.
*/
if (!file_inode(filp)->i_flock)
if (!ctx || list_empty(&ctx->flc_posix))
return;
lock.fl_type = F_UNLCK;

28
fs/nfs/delegation.c
View File

@ -85,17 +85,17 @@ static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_
{
struct inode *inode = state->inode;
struct file_lock *fl;
struct file_lock_context *flctx;
struct file_lock_context *flctx = inode->i_flctx;
struct list_head *list;
int status = 0;
if (inode->i_flock == NULL && inode->i_flctx == NULL)
if (flctx == NULL)
goto out;
/* Protect inode->i_flock using the i_lock */
list = &flctx->flc_posix;
spin_lock(&inode->i_lock);
for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
if (!(fl->fl_flags & (FL_POSIX)))
continue;
restart:
list_for_each_entry(fl, list, fl_list) {
if (nfs_file_open_context(fl->fl_file) != ctx)
continue;
spin_unlock(&inode->i_lock);
@ -104,19 +104,9 @@ static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_
goto out;
spin_lock(&inode->i_lock);
}
flctx = inode->i_flctx;
if (flctx) {
list_for_each_entry(fl, &flctx->flc_flock, fl_list) {
if (nfs_file_open_context(fl->fl_file) != ctx)
continue;
spin_unlock(&inode->i_lock);
status = nfs4_lock_delegation_recall(fl, state,
stateid);
if (status < 0)
goto out;
spin_lock(&inode->i_lock);
}
if (list == &flctx->flc_posix) {
list = &flctx->flc_flock;
goto restart;
}
spin_unlock(&inode->i_lock);
out:

52
fs/nfs/nfs4state.c
View File

@ -1367,53 +1367,18 @@ static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_
struct file_lock *fl;
int status = 0;
struct file_lock_context *flctx = inode->i_flctx;
struct list_head *list;
if (inode->i_flock == NULL && flctx == NULL)
if (flctx == NULL)
return 0;
list = &flctx->flc_posix;
/* Guard against delegation returns and new lock/unlock calls */
down_write(&nfsi->rwsem);
/* Protect inode->i_flock using the BKL */
spin_lock(&inode->i_lock);
for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
if (!(fl->fl_flags & FL_POSIX))
continue;
if (nfs_file_open_context(fl->fl_file)->state != state)
continue;
spin_unlock(&inode->i_lock);
status = ops->recover_lock(state, fl);
switch (status) {
case 0:
break;
case -ESTALE:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_EXPIRED:
case -NFS4ERR_NO_GRACE:
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_BADSESSION:
case -NFS4ERR_BADSLOT:
case -NFS4ERR_BAD_HIGH_SLOT:
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
goto out;
default:
printk(KERN_ERR "NFS: %s: unhandled error %d\n",
__func__, status);
case -ENOMEM:
case -NFS4ERR_DENIED:
case -NFS4ERR_RECLAIM_BAD:
case -NFS4ERR_RECLAIM_CONFLICT:
/* kill_proc(fl->fl_pid, SIGLOST, 1); */
status = 0;
}
spin_lock(&inode->i_lock);
}
if (!flctx)
goto out_unlock;
list_for_each_entry(fl, &flctx->flc_flock, fl_list) {
restart:
list_for_each_entry(fl, list, fl_list) {
if (nfs_file_open_context(fl->fl_file)->state != state)
continue;
spin_unlock(&inode->i_lock);
@ -1445,7 +1410,10 @@ static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_
}
spin_lock(&inode->i_lock);
}
out_unlock:
if (list == &flctx->flc_posix) {
list = &flctx->flc_flock;
goto restart;
}
spin_unlock(&inode->i_lock);
out:
up_write(&nfsi->rwsem);

8
fs/nfs/pagelist.c
View File

@ -831,12 +831,10 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev,
if (prev) {
if (!nfs_match_open_context(req->wb_context, prev->wb_context))
return false;
if (req->wb_context->dentry->d_inode->i_flock != NULL &&
!nfs_match_lock_context(req->wb_lock_context,
prev->wb_lock_context))
return false;
flctx = req->wb_context->dentry->d_inode->i_flctx;
if (flctx != NULL && !list_empty_careful(&flctx->flc_flock) &&
if (flctx != NULL &&
!(list_empty_careful(&flctx->flc_posix) &&
list_empty_careful(&flctx->flc_flock)) &&
!nfs_match_lock_context(req->wb_lock_context,
prev->wb_lock_context))
return false;

30
fs/nfs/write.c
View File

@ -1091,6 +1091,7 @@ int nfs_flush_incompatible(struct file *file, struct page *page)
{
struct nfs_open_context *ctx = nfs_file_open_context(file);
struct nfs_lock_context *l_ctx;
struct file_lock_context *flctx = file_inode(file)->i_flctx;
struct nfs_page *req;
int do_flush, status;
/*
@ -1109,12 +1110,9 @@ int nfs_flush_incompatible(struct file *file, struct page *page)
do_flush = req->wb_page != page || req->wb_context != ctx;
/* for now, flush if more than 1 request in page_group */
do_flush |= req->wb_this_page != req;
if (l_ctx && ctx->dentry->d_inode->i_flock != NULL) {
do_flush |= l_ctx->lockowner.l_owner != current->files
|| l_ctx->lockowner.l_pid != current->tgid;
}
if (l_ctx && ctx->dentry->d_inode->i_flctx &&
!list_empty_careful(&ctx->dentry->d_inode->i_flctx->flc_flock)) {
if (l_ctx && flctx &&
!(list_empty_careful(&flctx->flc_posix) &&
list_empty_careful(&flctx->flc_flock))) {
do_flush |= l_ctx->lockowner.l_owner != current->files
|| l_ctx->lockowner.l_pid != current->tgid;
}
@ -1202,26 +1200,24 @@ static int nfs_can_extend_write(struct file *file, struct page *page, struct ino
return 0;
if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
return 1;
if (!inode->i_flock && !flctx)
if (!flctx || (list_empty_careful(&flctx->flc_flock) &&
list_empty_careful(&flctx->flc_posix)))
return 0;
/* Check to see if there are whole file write locks */
spin_lock(&inode->i_lock);
ret = 0;
fl = inode->i_flock;
if (fl && is_whole_file_wrlock(fl)) {
ret = 1;
goto out;
}
if (!list_empty(&flctx->flc_flock)) {
spin_lock(&inode->i_lock);
if (!list_empty(&flctx->flc_posix)) {
fl = list_first_entry(&flctx->flc_posix, struct file_lock,
fl_list);
if (is_whole_file_wrlock(fl))
ret = 1;
} else if (!list_empty(&flctx->flc_flock)) {
fl = list_first_entry(&flctx->flc_flock, struct file_lock,
fl_list);
if (fl->fl_type == F_WRLCK)
ret = 1;
}
out:
spin_unlock(&inode->i_lock);
return ret;
}

18
fs/nfsd/nfs4state.c
View File

@ -5556,10 +5556,11 @@ out_nfserr:
static bool
check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
{
struct file_lock **flpp;
struct file_lock *fl;
int status = false;
struct file *filp = find_any_file(fp);
struct inode *inode;
struct file_lock_context *flctx;
if (!filp) {
/* Any valid lock stateid should have some sort of access */
@ -5568,15 +5569,18 @@ check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
}
inode = file_inode(filp);
flctx = inode->i_flctx;
spin_lock(&inode->i_lock);
for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
status = true;
break;
if (flctx && !list_empty_careful(&flctx->flc_posix)) {
spin_lock(&inode->i_lock);
list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
if (fl->fl_owner == (fl_owner_t)lowner) {
status = true;
break;
}
}
spin_unlock(&inode->i_lock);
}
spin_unlock(&inode->i_lock);
fput(filp);
return status;
}

2
fs/read_write.c
View File

@ -358,7 +358,7 @@ int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t
return retval;
}
if (unlikely(inode->i_flock && mandatory_lock(inode))) {
if (unlikely(inode->i_flctx && mandatory_lock(inode))) {
retval = locks_mandatory_area(
read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE,
inode, file, pos, count);

3
include/linux/fs.h
View File

@ -968,6 +968,7 @@ struct file_lock {
struct file_lock_context {
struct list_head flc_flock;
struct list_head flc_posix;
};
/* The following constant reflects the upper bound of the file/locking space */
@ -1971,7 +1972,7 @@ static inline int locks_verify_truncate(struct inode *inode,
struct file *filp,
loff_t size)
{
if (inode->i_flock && mandatory_lock(inode))
if (inode->i_flctx && mandatory_lock(inode))
return locks_mandatory_area(
FLOCK_VERIFY_WRITE, inode, filp,
size < inode->i_size ? size : inode->i_size,