locks: convert lease handling to file_lock_context
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Acked-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/locks.c b/fs/locks.c
index e50bb4d..d46e705 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -216,6 +216,7 @@
INIT_LIST_HEAD(&new->flc_flock);
INIT_LIST_HEAD(&new->flc_posix);
+ INIT_LIST_HEAD(&new->flc_lease);
/*
* Assign the pointer if it's not already assigned. If it is, then
@@ -240,6 +241,7 @@
if (ctx) {
WARN_ON_ONCE(!list_empty(&ctx->flc_flock));
WARN_ON_ONCE(!list_empty(&ctx->flc_posix));
+ WARN_ON_ONCE(!list_empty(&ctx->flc_lease));
kmem_cache_free(flctx_cache, ctx);
}
}
@@ -677,22 +679,6 @@
spin_unlock(&blocked_lock_lock);
}
-/* Insert file lock fl into an inode's lock list at the position indicated
- * by pos. At the same time add the lock to the global file lock list.
- *
- * Must be called with the i_lock held!
- */
-static void locks_insert_lock(struct file_lock **pos, struct file_lock *fl)
-{
- fl->fl_nspid = get_pid(task_tgid(current));
-
- /* insert into file's list */
- fl->fl_next = *pos;
- *pos = fl;
-
- locks_insert_global_locks(fl);
-}
-
static void
locks_insert_lock_ctx(struct file_lock *fl, struct list_head *before)
{
@@ -701,61 +687,26 @@
locks_insert_global_locks(fl);
}
-/**
- * locks_delete_lock - Delete a lock and then free it.
- * @thisfl_p: pointer that points to the fl_next field of the previous
- * inode->i_flock list entry
- *
- * Unlink a lock from all lists and free the namespace reference, but don't
- * free it yet. Wake up processes that are blocked waiting for this lock and
- * notify the FS that the lock has been cleared.
- *
- * Must be called with the i_lock held!
- */
-static void locks_unlink_lock(struct file_lock **thisfl_p)
+static void
+locks_unlink_lock_ctx(struct file_lock *fl)
{
- struct file_lock *fl = *thisfl_p;
-
locks_delete_global_locks(fl);
-
- *thisfl_p = fl->fl_next;
- fl->fl_next = NULL;
-
+ list_del_init(&fl->fl_list);
if (fl->fl_nspid) {
put_pid(fl->fl_nspid);
fl->fl_nspid = NULL;
}
-
locks_wake_up_blocks(fl);
}
-/*
- * Unlink a lock from all lists and free it.
- *
- * Must be called with i_lock held!
- */
-static void locks_delete_lock(struct file_lock **thisfl_p,
- struct list_head *dispose)
-{
- struct file_lock *fl = *thisfl_p;
-
- locks_unlink_lock(thisfl_p);
- if (dispose)
- list_add(&fl->fl_list, dispose);
- else
- locks_free_lock(fl);
-}
-
static void
locks_delete_lock_ctx(struct file_lock *fl, struct list_head *dispose)
{
- locks_delete_global_locks(fl);
- if (fl->fl_nspid) {
- put_pid(fl->fl_nspid);
- fl->fl_nspid = NULL;
- }
- locks_wake_up_blocks(fl);
- list_move(&fl->fl_list, dispose);
+ locks_unlink_lock_ctx(fl);
+ if (dispose)
+ list_add(&fl->fl_list, dispose);
+ else
+ locks_free_lock(fl);
}
/* Determine if lock sys_fl blocks lock caller_fl. Common functionality
@@ -1376,7 +1327,7 @@
printk(KERN_ERR "locks_delete_lock: fasync == %p\n", fl->fl_fasync);
fl->fl_fasync = NULL;
}
- locks_delete_lock(before, dispose);
+ locks_delete_lock_ctx(fl, dispose);
}
return 0;
}
@@ -1392,20 +1343,17 @@
static void time_out_leases(struct inode *inode, struct list_head *dispose)
{
- struct file_lock **before;
- struct file_lock *fl;
+ struct file_lock_context *ctx = inode->i_flctx;
+ struct file_lock *fl, *tmp;
lockdep_assert_held(&inode->i_lock);
- before = &inode->i_flock;
- while ((fl = *before) && IS_LEASE(fl) && lease_breaking(fl)) {
+ list_for_each_entry_safe(fl, tmp, &ctx->flc_lease, fl_list) {
trace_time_out_leases(inode, fl);
if (past_time(fl->fl_downgrade_time))
- lease_modify(before, F_RDLCK, dispose);
+ lease_modify(&fl, F_RDLCK, dispose);
if (past_time(fl->fl_break_time))
- lease_modify(before, F_UNLCK, dispose);
- if (fl == *before) /* lease_modify may have freed fl */
- before = &fl->fl_next;
+ lease_modify(&fl, F_UNLCK, dispose);
}
}
@@ -1419,11 +1367,12 @@
static bool
any_leases_conflict(struct inode *inode, struct file_lock *breaker)
{
+ struct file_lock_context *ctx = inode->i_flctx;
struct file_lock *fl;
lockdep_assert_held(&inode->i_lock);
- for (fl = inode->i_flock ; fl && IS_LEASE(fl); fl = fl->fl_next) {
+ list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
if (leases_conflict(fl, breaker))
return true;
}
@@ -1447,7 +1396,8 @@
{
int error = 0;
struct file_lock *new_fl;
- struct file_lock *fl, **before;
+ struct file_lock_context *ctx = inode->i_flctx;
+ struct file_lock *fl;
unsigned long break_time;
int want_write = (mode & O_ACCMODE) != O_RDONLY;
LIST_HEAD(dispose);
@@ -1457,6 +1407,12 @@
return PTR_ERR(new_fl);
new_fl->fl_flags = type;
+ /* typically we will check that ctx is non-NULL before calling */
+ if (!ctx) {
+ WARN_ON_ONCE(1);
+ return error;
+ }
+
spin_lock(&inode->i_lock);
time_out_leases(inode, &dispose);
@@ -1471,9 +1427,7 @@
break_time++; /* so that 0 means no break time */
}
- for (before = &inode->i_flock;
- ((fl = *before) != NULL) && IS_LEASE(fl);
- before = &fl->fl_next) {
+ list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
if (!leases_conflict(fl, new_fl))
continue;
if (want_write) {
@@ -1482,17 +1436,16 @@
fl->fl_flags |= FL_UNLOCK_PENDING;
fl->fl_break_time = break_time;
} else {
- if (lease_breaking(inode->i_flock))
+ if (lease_breaking(fl))
continue;
fl->fl_flags |= FL_DOWNGRADE_PENDING;
fl->fl_downgrade_time = break_time;
}
if (fl->fl_lmops->lm_break(fl))
- locks_delete_lock(before, &dispose);
+ locks_delete_lock_ctx(fl, &dispose);
}
- fl = inode->i_flock;
- if (!fl || !IS_LEASE(fl))
+ if (list_empty(&ctx->flc_lease))
goto out;
if (mode & O_NONBLOCK) {
@@ -1502,12 +1455,13 @@
}
restart:
- break_time = inode->i_flock->fl_break_time;
+ fl = list_first_entry(&ctx->flc_lease, struct file_lock, fl_list);
+ break_time = fl->fl_break_time;
if (break_time != 0)
break_time -= jiffies;
if (break_time == 0)
break_time++;
- locks_insert_block(inode->i_flock, new_fl);
+ locks_insert_block(fl, new_fl);
trace_break_lease_block(inode, new_fl);
spin_unlock(&inode->i_lock);
locks_dispose_list(&dispose);
@@ -1525,10 +1479,8 @@
time_out_leases(inode, &dispose);
if (any_leases_conflict(inode, new_fl))
goto restart;
-
error = 0;
}
-
out:
spin_unlock(&inode->i_lock);
locks_dispose_list(&dispose);
@@ -1550,13 +1502,17 @@
void lease_get_mtime(struct inode *inode, struct timespec *time)
{
bool has_lease = false;
- struct file_lock *flock;
+ struct file_lock_context *ctx = inode->i_flctx;
+ struct file_lock *fl;
- if (inode->i_flock) {
+ if (ctx && !list_empty_careful(&ctx->flc_lease)) {
spin_lock(&inode->i_lock);
- flock = inode->i_flock;
- if (flock && IS_LEASE(flock) && (flock->fl_type == F_WRLCK))
- has_lease = true;
+ if (!list_empty(&ctx->flc_lease)) {
+ fl = list_first_entry(&ctx->flc_lease,
+ struct file_lock, fl_list);
+ if (fl->fl_type == F_WRLCK)
+ has_lease = true;
+ }
spin_unlock(&inode->i_lock);
}
@@ -1595,20 +1551,22 @@
{
struct file_lock *fl;
struct inode *inode = file_inode(filp);
+ struct file_lock_context *ctx = inode->i_flctx;
int type = F_UNLCK;
LIST_HEAD(dispose);
- spin_lock(&inode->i_lock);
- 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) {
+ if (ctx && !list_empty_careful(&ctx->flc_lease)) {
+ spin_lock(&inode->i_lock);
+ time_out_leases(file_inode(filp), &dispose);
+ list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
+ if (fl->fl_file != filp)
+ continue;
type = target_leasetype(fl);
break;
}
+ spin_unlock(&inode->i_lock);
+ locks_dispose_list(&dispose);
}
- spin_unlock(&inode->i_lock);
- locks_dispose_list(&dispose);
return type;
}
@@ -1641,9 +1599,10 @@
static int
generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **priv)
{
- struct file_lock *fl, **before, **my_before = NULL, *lease;
+ struct file_lock *fl, *my_fl = NULL, *lease;
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
+ struct file_lock_context *ctx;
bool is_deleg = (*flp)->fl_flags & FL_DELEG;
int error;
LIST_HEAD(dispose);
@@ -1651,6 +1610,10 @@
lease = *flp;
trace_generic_add_lease(inode, lease);
+ ctx = locks_get_lock_context(inode);
+ if (!ctx)
+ return -ENOMEM;
+
/*
* In the delegation case we need mutual exclusion with
* a number of operations that take the i_mutex. We trylock
@@ -1684,13 +1647,12 @@
* except for this filp.
*/
error = -EAGAIN;
- for (before = &inode->i_flock;
- ((fl = *before) != NULL) && IS_LEASE(fl);
- before = &fl->fl_next) {
+ list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
if (fl->fl_file == filp) {
- my_before = before;
+ my_fl = fl;
continue;
}
+
/*
* No exclusive leases if someone else has a lease on
* this file:
@@ -1705,9 +1667,8 @@
goto out;
}
- if (my_before != NULL) {
- lease = *my_before;
- error = lease->fl_lmops->lm_change(my_before, arg, &dispose);
+ if (my_fl != NULL) {
+ error = lease->fl_lmops->lm_change(&my_fl, arg, &dispose);
if (error)
goto out;
goto out_setup;
@@ -1717,7 +1678,7 @@
if (!leases_enable)
goto out;
- locks_insert_lock(before, lease);
+ locks_insert_lock_ctx(lease, &ctx->flc_lease);
/*
* The check in break_lease() is lockless. It's possible for another
* open to race in after we did the earlier check for a conflicting
@@ -1729,8 +1690,10 @@
*/
smp_mb();
error = check_conflicting_open(dentry, arg);
- if (error)
- goto out_unlink;
+ if (error) {
+ locks_unlink_lock_ctx(lease);
+ goto out;
+ }
out_setup:
if (lease->fl_lmops->lm_setup)
@@ -1740,33 +1703,35 @@
locks_dispose_list(&dispose);
if (is_deleg)
mutex_unlock(&inode->i_mutex);
- if (!error && !my_before)
+ if (!error && !my_fl)
*flp = NULL;
return error;
-out_unlink:
- locks_unlink_lock(before);
- goto out;
}
static int generic_delete_lease(struct file *filp)
{
int error = -EAGAIN;
- struct file_lock *fl, **before;
+ struct file_lock *fl, *victim = NULL;
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
+ struct file_lock_context *ctx = inode->i_flctx;
LIST_HEAD(dispose);
+ if (!ctx) {
+ trace_generic_delete_lease(inode, NULL);
+ return error;
+ }
+
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) {
- if (fl->fl_file == filp)
+ list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
+ if (fl->fl_file == filp) {
+ victim = fl;
break;
+ }
}
trace_generic_delete_lease(inode, fl);
- if (fl && IS_LEASE(fl))
- error = fl->fl_lmops->lm_change(before, F_UNLCK, &dispose);
+ if (victim)
+ error = fl->fl_lmops->lm_change(&victim, F_UNLCK, &dispose);
spin_unlock(&inode->i_lock);
locks_dispose_list(&dispose);
return error;
@@ -2447,56 +2412,37 @@
fl.fl_ops->fl_release_private(&fl);
}
+static void
+locks_remove_lease(struct file *filp)
+{
+ struct inode *inode = file_inode(filp);
+ struct file_lock_context *ctx = inode->i_flctx;
+ struct file_lock *fl, *tmp;
+ LIST_HEAD(dispose);
+
+ if (!ctx || list_empty(&ctx->flc_lease))
+ return;
+
+ spin_lock(&inode->i_lock);
+ list_for_each_entry_safe(fl, tmp, &ctx->flc_lease, fl_list)
+ lease_modify(&fl, F_UNLCK, &dispose);
+ spin_unlock(&inode->i_lock);
+ locks_dispose_list(&dispose);
+}
+
/*
* This function is called on the last close of an open file.
*/
void locks_remove_file(struct file *filp)
{
- struct inode * inode = file_inode(filp);
- struct file_lock *fl;
- struct file_lock **before;
- LIST_HEAD(dispose);
-
/* remove any OFD locks */
locks_remove_posix(filp, filp);
/* remove flock locks */
locks_remove_flock(filp);
- if (!inode->i_flock)
- return;
-
- spin_lock(&inode->i_lock);
- before = &inode->i_flock;
-
- while ((fl = *before) != NULL) {
- if (fl->fl_file == filp) {
- if (IS_LEASE(fl)) {
- lease_modify(before, F_UNLCK, &dispose);
- continue;
- }
-
- /*
- * There's a leftover lock on the list of a type that
- * we didn't expect to see. Most likely a classic
- * POSIX lock that ended up not getting released
- * properly, or that raced onto the list somehow. Log
- * some info about it and then just remove it from
- * the list.
- */
- WARN(1, "leftover lock: dev=%u:%u ino=%lu type=%hhd flags=0x%x start=%lld end=%lld\n",
- MAJOR(inode->i_sb->s_dev),
- MINOR(inode->i_sb->s_dev), inode->i_ino,
- fl->fl_type, fl->fl_flags,
- fl->fl_start, fl->fl_end);
-
- locks_delete_lock(before, &dispose);
- continue;
- }
- before = &fl->fl_next;
- }
- spin_unlock(&inode->i_lock);
- locks_dispose_list(&dispose);
+ /* remove any leases */
+ locks_remove_lease(filp);
}
/**
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 571f113..2ddec3c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -969,6 +969,7 @@
struct file_lock_context {
struct list_head flc_flock;
struct list_head flc_posix;
+ struct list_head flc_lease;
};
/* The following constant reflects the upper bound of the file/locking space */
@@ -1990,7 +1991,7 @@
* end up racing with tasks trying to set a new lease on this file.
*/
smp_mb();
- if (inode->i_flock)
+ if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
return __break_lease(inode, mode, FL_LEASE);
return 0;
}
@@ -2003,7 +2004,7 @@
* end up racing with tasks trying to set a new lease on this file.
*/
smp_mb();
- if (inode->i_flock)
+ if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
return __break_lease(inode, mode, FL_DELEG);
return 0;
}