提交 c45198ed 编写于 作者: J Jeff Layton

locks: move freeing of leases outside of i_lock

There was only one place where we still could free a file_lock while
holding the i_lock -- lease_modify. Add a new list_head argument to the
lm_change operation, pass in a private list when calling it, and fix
those callers to dispose of the list once the lock has been dropped.
Signed-off-by: NJeff Layton <jlayton@primarydata.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
上级 f82b4b67
......@@ -469,8 +469,7 @@ prototypes:
};
locking rules:
All may block except for ->setlease.
No VFS locks held on entry except for ->setlease.
All may block.
->llseek() locking has moved from llseek to the individual llseek
implementations. If your fs is not using generic_file_llseek, you
......
......@@ -1292,7 +1292,7 @@ static void lease_clear_pending(struct file_lock *fl, int arg)
}
/* We already had a lease on this file; just change its type */
int lease_modify(struct file_lock **before, int arg)
int lease_modify(struct file_lock **before, int arg, struct list_head *dispose)
{
struct file_lock *fl = *before;
int error = assign_type(fl, arg);
......@@ -1311,7 +1311,7 @@ int lease_modify(struct file_lock **before, int arg)
printk(KERN_ERR "locks_delete_lock: fasync == %p\n", fl->fl_fasync);
fl->fl_fasync = NULL;
}
locks_delete_lock(before, NULL);
locks_delete_lock(before, dispose);
}
return 0;
}
......@@ -1325,7 +1325,7 @@ static bool past_time(unsigned long then)
return time_after(jiffies, then);
}
static void time_out_leases(struct inode *inode)
static void time_out_leases(struct inode *inode, struct list_head *dispose)
{
struct file_lock **before;
struct file_lock *fl;
......@@ -1336,9 +1336,9 @@ static void time_out_leases(struct inode *inode)
while ((fl = *before) && IS_LEASE(fl) && lease_breaking(fl)) {
trace_time_out_leases(inode, fl);
if (past_time(fl->fl_downgrade_time))
lease_modify(before, F_RDLCK);
lease_modify(before, F_RDLCK, dispose);
if (past_time(fl->fl_break_time))
lease_modify(before, F_UNLCK);
lease_modify(before, F_UNLCK, dispose);
if (fl == *before) /* lease_modify may have freed fl */
before = &fl->fl_next;
}
......@@ -1373,6 +1373,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
int i_have_this_lease = 0;
bool lease_conflict = false;
int want_write = (mode & O_ACCMODE) != O_RDONLY;
LIST_HEAD(dispose);
new_fl = lease_alloc(NULL, want_write ? F_WRLCK : F_RDLCK);
if (IS_ERR(new_fl))
......@@ -1381,7 +1382,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
spin_lock(&inode->i_lock);
time_out_leases(inode);
time_out_leases(inode, &dispose);
flock = inode->i_flock;
if ((flock == NULL) || !IS_LEASE(flock))
......@@ -1436,6 +1437,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
locks_insert_block(flock, new_fl);
trace_break_lease_block(inode, new_fl);
spin_unlock(&inode->i_lock);
locks_dispose_list(&dispose);
error = wait_event_interruptible_timeout(new_fl->fl_wait,
!new_fl->fl_next, break_time);
spin_lock(&inode->i_lock);
......@@ -1443,7 +1445,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
locks_delete_block(new_fl);
if (error >= 0) {
if (error == 0)
time_out_leases(inode);
time_out_leases(inode, &dispose);
/*
* Wait for the next conflicting lease that has not been
* broken yet
......@@ -1458,6 +1460,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
out:
spin_unlock(&inode->i_lock);
locks_dispose_list(&dispose);
locks_free_lock(new_fl);
return error;
}
......@@ -1522,9 +1525,10 @@ int fcntl_getlease(struct file *filp)
struct file_lock *fl;
struct inode *inode = file_inode(filp);
int type = F_UNLCK;
LIST_HEAD(dispose);
spin_lock(&inode->i_lock);
time_out_leases(file_inode(filp));
time_out_leases(file_inode(filp), &dispose);
for (fl = file_inode(filp)->i_flock; fl && IS_LEASE(fl);
fl = fl->fl_next) {
if (fl->fl_file == filp) {
......@@ -1533,6 +1537,7 @@ int fcntl_getlease(struct file *filp)
}
}
spin_unlock(&inode->i_lock);
locks_dispose_list(&dispose);
return type;
}
......@@ -1570,6 +1575,7 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
struct inode *inode = dentry->d_inode;
bool is_deleg = (*flp)->fl_flags & FL_DELEG;
int error;
LIST_HEAD(dispose);
lease = *flp;
trace_generic_add_lease(inode, lease);
......@@ -1593,7 +1599,7 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
}
spin_lock(&inode->i_lock);
time_out_leases(inode);
time_out_leases(inode, &dispose);
error = check_conflicting_open(dentry, arg);
if (error)
goto out;
......@@ -1630,7 +1636,7 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
if (my_before != NULL) {
lease = *my_before;
error = lease->fl_lmops->lm_change(my_before, arg);
error = lease->fl_lmops->lm_change(my_before, arg, &dispose);
if (error)
goto out;
goto out_setup;
......@@ -1660,6 +1666,7 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
lease->fl_lmops->lm_setup(lease, priv);
out:
spin_unlock(&inode->i_lock);
locks_dispose_list(&dispose);
if (is_deleg)
mutex_unlock(&inode->i_mutex);
if (!error && !my_before)
......@@ -1676,8 +1683,10 @@ static int generic_delete_lease(struct file *filp)
struct file_lock *fl, **before;
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
LIST_HEAD(dispose);
spin_lock(&inode->i_lock);
time_out_leases(inode, &dispose);
for (before = &inode->i_flock;
((fl = *before) != NULL) && IS_LEASE(fl);
before = &fl->fl_next) {
......@@ -1686,8 +1695,9 @@ static int generic_delete_lease(struct file *filp)
}
trace_generic_delete_lease(inode, fl);
if (fl)
error = fl->fl_lmops->lm_change(before, F_UNLCK);
error = fl->fl_lmops->lm_change(before, F_UNLCK, &dispose);
spin_unlock(&inode->i_lock);
locks_dispose_list(&dispose);
return error;
}
......@@ -2372,7 +2382,7 @@ void locks_remove_file(struct file *filp)
while ((fl = *before) != NULL) {
if (fl->fl_file == filp) {
if (IS_LEASE(fl)) {
lease_modify(before, F_UNLCK);
lease_modify(before, F_UNLCK, &dispose);
continue;
}
......
......@@ -3427,11 +3427,11 @@ static void nfsd_break_deleg_cb(struct file_lock *fl)
spin_unlock(&fp->fi_lock);
}
static
int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
static int
nfsd_change_deleg_cb(struct file_lock **onlist, int arg, struct list_head *dispose)
{
if (arg & F_UNLCK)
return lease_modify(onlist, arg);
return lease_modify(onlist, arg, dispose);
else
return -EAGAIN;
}
......
......@@ -873,7 +873,7 @@ struct lock_manager_operations {
void (*lm_notify)(struct file_lock *); /* unblock callback */
int (*lm_grant)(struct file_lock *, int);
void (*lm_break)(struct file_lock *);
int (*lm_change)(struct file_lock **, int);
int (*lm_change)(struct file_lock **, int, struct list_head *);
void (*lm_setup)(struct file_lock *, void **);
};
......@@ -985,7 +985,7 @@ extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int t
extern void lease_get_mtime(struct inode *, struct timespec *time);
extern int generic_setlease(struct file *, long, struct file_lock **, void **priv);
extern int vfs_setlease(struct file *, long, struct file_lock **, void **);
extern int lease_modify(struct file_lock **, int);
extern int lease_modify(struct file_lock **, int, struct list_head *);
#else /* !CONFIG_FILE_LOCKING */
static inline int fcntl_getlk(struct file *file, unsigned int cmd,
struct flock __user *user)
......@@ -1112,7 +1112,8 @@ static inline int vfs_setlease(struct file *filp, long arg,
return -EINVAL;
}
static inline int lease_modify(struct file_lock **before, int arg)
static inline int lease_modify(struct file_lock **before, int arg,
struct list_head *dispose)
{
return -EINVAL;
}
......
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