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Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c126
1 files changed, 75 insertions, 51 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 13fc7a6d380a..da57c9b7e844 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -130,12 +130,15 @@
#include <linux/percpu.h>
#include <linux/lglock.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/filelock.h>
+
#include <asm/uaccess.h>
#define IS_POSIX(fl) (fl->fl_flags & FL_POSIX)
#define IS_FLOCK(fl) (fl->fl_flags & FL_FLOCK)
#define IS_LEASE(fl) (fl->fl_flags & (FL_LEASE|FL_DELEG))
-#define IS_FILE_PVT(fl) (fl->fl_flags & FL_FILE_PVT)
+#define IS_OFDLCK(fl) (fl->fl_flags & FL_OFDLCK)
static bool lease_breaking(struct file_lock *fl)
{
@@ -322,6 +325,7 @@ static int flock_make_lock(struct file *filp, struct file_lock **lock,
return -ENOMEM;
fl->fl_file = filp;
+ fl->fl_owner = (fl_owner_t)filp;
fl->fl_pid = current->tgid;
fl->fl_flags = FL_FLOCK;
fl->fl_type = type;
@@ -389,18 +393,6 @@ static int flock64_to_posix_lock(struct file *filp, struct file_lock *fl,
fl->fl_ops = NULL;
fl->fl_lmops = NULL;
- /* Ensure that fl->fl_filp has compatible f_mode */
- switch (l->l_type) {
- case F_RDLCK:
- if (!(filp->f_mode & FMODE_READ))
- return -EBADF;
- break;
- case F_WRLCK:
- if (!(filp->f_mode & FMODE_WRITE))
- return -EBADF;
- break;
- }
-
return assign_type(fl, l->l_type);
}
@@ -439,7 +431,7 @@ static int lease_init(struct file *filp, long type, struct file_lock *fl)
if (assign_type(fl, type) != 0)
return -EINVAL;
- fl->fl_owner = current->files;
+ fl->fl_owner = (fl_owner_t)filp;
fl->fl_pid = current->tgid;
fl->fl_file = filp;
@@ -564,7 +556,7 @@ static void __locks_insert_block(struct file_lock *blocker,
BUG_ON(!list_empty(&waiter->fl_block));
waiter->fl_next = blocker;
list_add_tail(&waiter->fl_block, &blocker->fl_block);
- if (IS_POSIX(blocker) && !IS_FILE_PVT(blocker))
+ if (IS_POSIX(blocker) && !IS_OFDLCK(blocker))
locks_insert_global_blocked(waiter);
}
@@ -759,12 +751,12 @@ EXPORT_SYMBOL(posix_test_lock);
* of tasks (such as posix threads) sharing the same open file table.
* To handle those cases, we just bail out after a few iterations.
*
- * For FL_FILE_PVT locks, the owner is the filp, not the files_struct.
+ * For FL_OFDLCK locks, the owner is the filp, not the files_struct.
* Because the owner is not even nominally tied to a thread of
* execution, the deadlock detection below can't reasonably work well. Just
* skip it for those.
*
- * In principle, we could do a more limited deadlock detection on FL_FILE_PVT
+ * In principle, we could do a more limited deadlock detection on FL_OFDLCK
* locks that just checks for the case where two tasks are attempting to
* upgrade from read to write locks on the same inode.
*/
@@ -791,9 +783,9 @@ static int posix_locks_deadlock(struct file_lock *caller_fl,
/*
* This deadlock detector can't reasonably detect deadlocks with
- * FL_FILE_PVT locks, since they aren't owned by a process, per-se.
+ * FL_OFDLCK locks, since they aren't owned by a process, per-se.
*/
- if (IS_FILE_PVT(caller_fl))
+ if (IS_OFDLCK(caller_fl))
return 0;
while ((block_fl = what_owner_is_waiting_for(block_fl))) {
@@ -1298,6 +1290,7 @@ static void time_out_leases(struct inode *inode)
before = &inode->i_flock;
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);
if (past_time(fl->fl_break_time))
@@ -1385,22 +1378,24 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
}
if (i_have_this_lease || (mode & O_NONBLOCK)) {
+ trace_break_lease_noblock(inode, new_fl);
error = -EWOULDBLOCK;
goto out;
}
restart:
break_time = flock->fl_break_time;
- if (break_time != 0) {
+ if (break_time != 0)
break_time -= jiffies;
- if (break_time == 0)
- break_time++;
- }
+ if (break_time == 0)
+ break_time++;
locks_insert_block(flock, new_fl);
+ trace_break_lease_block(inode, new_fl);
spin_unlock(&inode->i_lock);
error = wait_event_interruptible_timeout(new_fl->fl_wait,
!new_fl->fl_next, break_time);
spin_lock(&inode->i_lock);
+ trace_break_lease_unblock(inode, new_fl);
locks_delete_block(new_fl);
if (error >= 0) {
if (error == 0)
@@ -1522,6 +1517,8 @@ static int generic_add_lease(struct file *filp, long arg, struct file_lock **flp
int error;
lease = *flp;
+ trace_generic_add_lease(inode, lease);
+
/*
* In the delegation case we need mutual exclusion with
* a number of operations that take the i_mutex. We trylock
@@ -1611,6 +1608,8 @@ static int generic_delete_lease(struct file *filp, struct file_lock **flp)
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
+ trace_generic_delete_lease(inode, *flp);
+
for (before = &inode->i_flock;
((fl = *before) != NULL) && IS_LEASE(fl);
before = &fl->fl_next) {
@@ -1891,7 +1890,7 @@ EXPORT_SYMBOL_GPL(vfs_test_lock);
static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl)
{
- flock->l_pid = IS_FILE_PVT(fl) ? -1 : fl->fl_pid;
+ flock->l_pid = IS_OFDLCK(fl) ? -1 : fl->fl_pid;
#if BITS_PER_LONG == 32
/*
* Make sure we can represent the posix lock via
@@ -1913,7 +1912,7 @@ static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl)
#if BITS_PER_LONG == 32
static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
{
- flock->l_pid = IS_FILE_PVT(fl) ? -1 : fl->fl_pid;
+ flock->l_pid = IS_OFDLCK(fl) ? -1 : fl->fl_pid;
flock->l_start = fl->fl_start;
flock->l_len = fl->fl_end == OFFSET_MAX ? 0 :
fl->fl_end - fl->fl_start + 1;
@@ -1942,13 +1941,13 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l)
if (error)
goto out;
- if (cmd == F_GETLKP) {
+ if (cmd == F_OFD_GETLK) {
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_GETLK;
- file_lock.fl_flags |= FL_FILE_PVT;
+ file_lock.fl_flags |= FL_OFDLCK;
file_lock.fl_owner = (fl_owner_t)filp;
}
@@ -2035,6 +2034,22 @@ static int do_lock_file_wait(struct file *filp, unsigned int cmd,
return error;
}
+/* Ensure that fl->fl_filp has compatible f_mode for F_SETLK calls */
+static int
+check_fmode_for_setlk(struct file_lock *fl)
+{
+ switch (fl->fl_type) {
+ case F_RDLCK:
+ if (!(fl->fl_file->f_mode & FMODE_READ))
+ return -EBADF;
+ break;
+ case F_WRLCK:
+ if (!(fl->fl_file->f_mode & FMODE_WRITE))
+ return -EBADF;
+ }
+ return 0;
+}
+
/* Apply the lock described by l to an open file descriptor.
* This implements both the F_SETLK and F_SETLKW commands of fcntl().
*/
@@ -2072,27 +2087,31 @@ again:
if (error)
goto out;
+ error = check_fmode_for_setlk(file_lock);
+ if (error)
+ goto out;
+
/*
* If the cmd is requesting file-private locks, then set the
- * FL_FILE_PVT flag and override the owner.
+ * FL_OFDLCK flag and override the owner.
*/
switch (cmd) {
- case F_SETLKP:
+ case F_OFD_SETLK:
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_SETLK;
- file_lock->fl_flags |= FL_FILE_PVT;
+ file_lock->fl_flags |= FL_OFDLCK;
file_lock->fl_owner = (fl_owner_t)filp;
break;
- case F_SETLKPW:
+ case F_OFD_SETLKW:
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_SETLKW;
- file_lock->fl_flags |= FL_FILE_PVT;
+ file_lock->fl_flags |= FL_OFDLCK;
file_lock->fl_owner = (fl_owner_t)filp;
/* Fallthrough */
case F_SETLKW:
@@ -2144,13 +2163,13 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l)
if (error)
goto out;
- if (cmd == F_GETLKP) {
+ if (cmd == F_OFD_GETLK) {
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_GETLK64;
- file_lock.fl_flags |= FL_FILE_PVT;
+ file_lock.fl_flags |= FL_OFDLCK;
file_lock.fl_owner = (fl_owner_t)filp;
}
@@ -2207,27 +2226,31 @@ again:
if (error)
goto out;
+ error = check_fmode_for_setlk(file_lock);
+ if (error)
+ goto out;
+
/*
* If the cmd is requesting file-private locks, then set the
- * FL_FILE_PVT flag and override the owner.
+ * FL_OFDLCK flag and override the owner.
*/
switch (cmd) {
- case F_SETLKP:
+ case F_OFD_SETLK:
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_SETLK64;
- file_lock->fl_flags |= FL_FILE_PVT;
+ file_lock->fl_flags |= FL_OFDLCK;
file_lock->fl_owner = (fl_owner_t)filp;
break;
- case F_SETLKPW:
+ case F_OFD_SETLKW:
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_SETLKW64;
- file_lock->fl_flags |= FL_FILE_PVT;
+ file_lock->fl_flags |= FL_OFDLCK;
file_lock->fl_owner = (fl_owner_t)filp;
/* Fallthrough */
case F_SETLKW64:
@@ -2305,6 +2328,7 @@ void locks_remove_file(struct file *filp)
if (filp->f_op->flock) {
struct file_lock fl = {
+ .fl_owner = (fl_owner_t)filp,
.fl_pid = current->tgid,
.fl_file = filp,
.fl_flags = FL_FLOCK,
@@ -2412,31 +2436,31 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
seq_printf(f, "%lld:%s ", id, pfx);
if (IS_POSIX(fl)) {
if (fl->fl_flags & FL_ACCESS)
- seq_printf(f, "ACCESS");
- else if (IS_FILE_PVT(fl))
- seq_printf(f, "FLPVT ");
+ seq_puts(f, "ACCESS");
+ else if (IS_OFDLCK(fl))
+ seq_puts(f, "OFDLCK");
else
- seq_printf(f, "POSIX ");
+ seq_puts(f, "POSIX ");
seq_printf(f, " %s ",
(inode == NULL) ? "*NOINODE*" :
mandatory_lock(inode) ? "MANDATORY" : "ADVISORY ");
} else if (IS_FLOCK(fl)) {
if (fl->fl_type & LOCK_MAND) {
- seq_printf(f, "FLOCK MSNFS ");
+ seq_puts(f, "FLOCK MSNFS ");
} else {
- seq_printf(f, "FLOCK ADVISORY ");
+ seq_puts(f, "FLOCK ADVISORY ");
}
} else if (IS_LEASE(fl)) {
- seq_printf(f, "LEASE ");
+ seq_puts(f, "LEASE ");
if (lease_breaking(fl))
- seq_printf(f, "BREAKING ");
+ seq_puts(f, "BREAKING ");
else if (fl->fl_file)
- seq_printf(f, "ACTIVE ");
+ seq_puts(f, "ACTIVE ");
else
- seq_printf(f, "BREAKER ");
+ seq_puts(f, "BREAKER ");
} else {
- seq_printf(f, "UNKNOWN UNKNOWN ");
+ seq_puts(f, "UNKNOWN UNKNOWN ");
}
if (fl->fl_type & LOCK_MAND) {
seq_printf(f, "%s ",
@@ -2468,7 +2492,7 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
else
seq_printf(f, "%Ld %Ld\n", fl->fl_start, fl->fl_end);
} else {
- seq_printf(f, "0 EOF\n");
+ seq_puts(f, "0 EOF\n");
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-24 15:40:34 +0300