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diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c
--- a/sys/kern/kern_descrip.c
+++ b/sys/kern/kern_descrip.c
@@ -658,6 +658,7 @@
error = EBADF;
break;
}
+ fsetfl_lock(fp);
do {
tmp = flg = fp->f_flag;
tmp &= ~FCNTLFLAGS;
@@ -677,6 +678,7 @@
if (error != 0)
goto revert_nonblock;
}
+ fsetfl_unlock(fp);
fdrop(fp, td);
break;
revert_nonblock:
@@ -691,6 +693,7 @@
tmp |= got_cleared;
tmp &= ~got_set;
} while (atomic_cmpset_int(&fp->f_flag, flg, tmp) == 0);
+ fsetfl_unlock(fp);
fdrop(fp, td);
break;
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -896,6 +896,18 @@
return (atomic_load_long(&fp->f_offset));
}
+void
+fsetfl_lock(struct file *fp)
+{
+ file_v_lock(fp, FILE_V_SETFL_LOCKED, FILE_V_SETFL_LOCK_WAITING);
+}
+
+void
+fsetfl_unlock(struct file *fp)
+{
+ file_v_unlock(fp, FILE_V_SETFL_LOCKED, FILE_V_SETFL_LOCK_WAITING);
+}
+
#else /* OFF_MAX <= LONG_MAX */
static void
@@ -971,6 +983,30 @@
return (foffset_lock(fp, FOF_NOLOCK));
}
+
+void
+fsetfl_lock(struct file *fp)
+{
+ struct mtx *mtxp;
+
+ mtxp = mtx_pool_find(mtxpool_sleep, fp);
+ mtx_lock(mtxp);
+ file_v_lock_mtxp(fp, mtxp, FILE_V_SETFL_LOCKED,
+ FILE_V_SETFL_LOCK_WAITING);
+ mtx_unlock(mtxp);
+}
+
+void
+fsetfl_unlock(struct file *fp)
+{
+ struct mtx *mtxp;
+
+ mtxp = mtx_pool_find(mtxpool_sleep, fp);
+ mtx_lock(mtxp);
+ file_v_unlock_mtxp(fp, mtxp, FILE_V_SETFL_LOCKED,
+ FILE_V_SETFL_LOCK_WAITING);
+ mtx_unlock(mtxp);
+}
#endif
void
diff --git a/sys/sys/file.h b/sys/sys/file.h
--- a/sys/sys/file.h
+++ b/sys/sys/file.h
@@ -93,6 +93,8 @@
void foffset_lock_uio(struct file *fp, struct uio *uio, int flags);
void foffset_unlock(struct file *fp, off_t val, int flags);
void foffset_unlock_uio(struct file *fp, struct uio *uio, int flags);
+void fsetfl_lock(struct file *fp);
+void fsetfl_unlock(struct file *fp);
static inline off_t
foffset_get(struct file *fp)
@@ -222,6 +224,8 @@
#define FILE_V_FOFFSET_LOCKED 0x0001
#define FILE_V_FOFFSET_LOCK_WAITING 0x0002
+#define FILE_V_SETFL_LOCKED 0x0004
+#define FILE_V_SETFL_LOCK_WAITING 0x0008
#endif /* __BSD_VISIBLE */
#endif /* _KERNEL || _WANT_FILE */

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