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locks: move freeing of leases outside of i_lock

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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: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jeff Layton 2014-09-01 07:12:07 -04:00
parent f82b4b6780
commit c45198eda2
4 changed files with 30 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

34
fs/locks.c
View file

@ -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 @@ restart:
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 @@ restart:
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 @@ restart:
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 @@ out_setup:
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;
}