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-rw-r--r--fs/ioprio.c23
-rw-r--r--include/linux/ioprio.h23
2 files changed, 24 insertions, 22 deletions
diff --git a/fs/ioprio.c b/fs/ioprio.c
index 06578311c63f..78b1deae3fa2 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -140,6 +140,29 @@ out:
140 return ret; 140 return ret;
141} 141}
142 142
143int ioprio_best(unsigned short aprio, unsigned short bprio)
144{
145 unsigned short aclass = IOPRIO_PRIO_CLASS(aprio);
146 unsigned short bclass = IOPRIO_PRIO_CLASS(bprio);
147
148 if (!ioprio_valid(aprio))
149 return bprio;
150 if (!ioprio_valid(bprio))
151 return aprio;
152
153 if (aclass == IOPRIO_CLASS_NONE)
154 aclass = IOPRIO_CLASS_BE;
155 if (bclass == IOPRIO_CLASS_NONE)
156 bclass = IOPRIO_CLASS_BE;
157
158 if (aclass == bclass)
159 return min(aprio, bprio);
160 if (aclass > bclass)
161 return bprio;
162 else
163 return aprio;
164}
165
143asmlinkage long sys_ioprio_get(int which, int who) 166asmlinkage long sys_ioprio_get(int which, int who)
144{ 167{
145 struct task_struct *g, *p; 168 struct task_struct *g, *p;
diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h
index 88d5961f7a3f..8e2042b9d471 100644
--- a/include/linux/ioprio.h
+++ b/include/linux/ioprio.h
@@ -59,27 +59,6 @@ static inline int task_nice_ioprio(struct task_struct *task)
59/* 59/*
60 * For inheritance, return the highest of the two given priorities 60 * For inheritance, return the highest of the two given priorities
61 */ 61 */
62static inline int ioprio_best(unsigned short aprio, unsigned short bprio) 62extern int ioprio_best(unsigned short aprio, unsigned short bprio);
63{
64 unsigned short aclass = IOPRIO_PRIO_CLASS(aprio);
65 unsigned short bclass = IOPRIO_PRIO_CLASS(bprio);
66
67 if (!ioprio_valid(aprio))
68 return bprio;
69 if (!ioprio_valid(bprio))
70 return aprio;
71
72 if (aclass == IOPRIO_CLASS_NONE)
73 aclass = IOPRIO_CLASS_BE;
74 if (bclass == IOPRIO_CLASS_NONE)
75 bclass = IOPRIO_CLASS_BE;
76
77 if (aclass == bclass)
78 return min(aprio, bprio);
79 if (aclass > bclass)
80 return bprio;
81 else
82 return aprio;
83}
84 63
85#endif 64#endif