drivers/ide/ide-tape.c



1da177e4c3f
5ce78af4bee

59bca8cc995

1da177e4c3f
1da177e4c3f


1da177e4c3f
5ce78af4bee

1da177e4c3f

51509eec34d

dfe799364e7
1da177e4c3f
1da177e4c3f


9bae1ff3e79
1da177e4c3f
1da177e4c3f

6d703a81ad5
1da177e4c3f


1da177e4c3f

cf8b8975c3c
90699ce2b28
1da177e4c3f

c837cfa5b61


1da177e4c3f
1da177e4c3f

8004a8c9744
e972d7027c0
8004a8c9744
e972d7027c0

8004a8c9744
e972d7027c0
8004a8c9744

1da177e4c3f
1da177e4c3f
3c98bf347d9

1da177e4c3f
3c98bf347d9
1da177e4c3f


3c98bf347d9


1da177e4c3f
3c98bf347d9
1da177e4c3f

3c98bf347d9
1da177e4c3f
3c98bf347d9

1da177e4c3f
3c98bf347d9


1da177e4c3f
3c98bf347d9


1da177e4c3f
3c98bf347d9

1da177e4c3f
3c98bf347d9

1da177e4c3f


54abf37e423


1da177e4c3f
03056b909b7


03056b909b7


1da177e4c3f
3c98bf347d9

1da177e4c3f

7f3c868ba78


8fed4368417
1da177e4c3f
2e8a6f89de6

394a4c2101f
1da177e4c3f
3c98bf347d9
1da177e4c3f
3c98bf347d9


5bd50dc6aa8
1da177e4c3f
6f3848ac239

1da177e4c3f


54bb2074ce5

1da177e4c3f

3c98bf347d9
1da177e4c3f

54bb2074ce5
1da177e4c3f
3c98bf347d9
1da177e4c3f

3c98bf347d9
1da177e4c3f


54abf37e423
1da177e4c3f
54bb2074ce5

1da177e4c3f
b6422013264
1da177e4c3f
b6422013264
1da177e4c3f

3c98bf347d9
1da177e4c3f
3c98bf347d9


1da177e4c3f
83042b24160
3c98bf347d9
f73850a302d
963da55c4b9


3c98bf347d9
3c98bf347d9
1da177e4c3f


1da177e4c3f


1da177e4c3f

2a48fc0ab24
cf8b8975c3c
1da177e4c3f
cbba2fa7b2c

d5dee80ad69

8fed4368417
08da591e14c
9d01e4cd7eb


1da177e4c3f


cf8b8975c3c
9d01e4cd7eb


08da591e14c
d3e33ff59fa
08da591e14c
d3e33ff59fa
8fed4368417
08da591e14c
9d01e4cd7eb
cf8b8975c3c
1da177e4c3f


1da177e4c3f

d3e33ff59fa

cf8b8975c3c
8fed4368417
d3e33ff59fa
cf8b8975c3c
1da177e4c3f

1da177e4c3f
1b5db434f4a

1da177e4c3f
ae3a8387be5
1da177e4c3f

5e2040fd0a9
dfb7e621fa1
ae3a8387be5
1da177e4c3f
1b5db434f4a


8004a8c9744
e972d7027c0


1da177e4c3f
077e6dba20e
21d9c5d2275
077e6dba20e
1da177e4c3f


90699ce2b28
1b5db434f4a


1da177e4c3f


346331f8282
1da177e4c3f

90699ce2b28
c152cc1a90f
346331f8282
1da177e4c3f
90699ce2b28
1b5db434f4a

c152cc1a90f
346331f8282
1da177e4c3f

90699ce2b28
1b5db434f4a
c152cc1a90f
346331f8282
1da177e4c3f
346331f8282
077e6dba20e
1da177e4c3f


b14c72127fb

03a2faaea8f
1da177e4c3f

2b9efba4828
313afea7f25
5985e6abbd8
313afea7f25
1da177e4c3f
e972d7027c0

8004a8c9744
b14c72127fb


5e2040fd0a9

dd2e9a032bc
5985e6abbd8

ae3a8387be5
5985e6abbd8


077e6dba20e

5985e6abbd8


5985e6abbd8
313afea7f25


1da177e4c3f
313afea7f25

03a2faaea8f
1da177e4c3f

1da177e4c3f
3c98bf347d9
b65fac32cfe
1da177e4c3f
6f3848ac239
1da177e4c3f


e972d7027c0
6f3848ac239
8004a8c9744
6f3848ac239
b65fac32cfe
54bb2074ce5
1da177e4c3f

74e63e74ea5


6f3848ac239
74e63e74ea5

1da177e4c3f
3c98bf347d9
1da177e4c3f
2b9efba4828
3c98bf347d9

1da177e4c3f
3c98bf347d9
1da177e4c3f
b788ee9c656
aa5d2de7b08
1da177e4c3f
aa5d2de7b08
3c98bf347d9
1da177e4c3f
3c98bf347d9


1da177e4c3f
3c98bf347d9

1da177e4c3f
3c98bf347d9
1da177e4c3f
3c98bf347d9


1da177e4c3f
3c98bf347d9


1da177e4c3f
1da177e4c3f
b788ee9c656


1da177e4c3f
1da177e4c3f
dfb7e621fa1
1da177e4c3f
5e2040fd0a9

2b9efba4828
1da177e4c3f
2b9efba4828
1da177e4c3f

346331f8282
b3071d190d6
1da177e4c3f
3c98bf347d9


1da177e4c3f
346331f8282
90699ce2b28
1da177e4c3f


c152cc1a90f
1da177e4c3f
b3071d190d6
5e2040fd0a9
b14c72127fb
dfb7e621fa1
92f5daff2b8
1da177e4c3f
e972d7027c0

1da177e4c3f

1da177e4c3f
b788ee9c656
1da177e4c3f

3c98bf347d9
d236d74c0d9
1da177e4c3f
7bf7420a318
90699ce2b28
1da177e4c3f
3c98bf347d9

1da177e4c3f


3c98bf347d9

1da177e4c3f
d236d74c0d9
1da177e4c3f
d236d74c0d9
1da177e4c3f
d236d74c0d9
1da177e4c3f

5a04cfa911f
1da177e4c3f
b73c7ee25da
1da177e4c3f
2b9efba4828
22c525b9767
1da177e4c3f
374e042c3e7
c47137a99c5
3a7d24841ad

1da177e4c3f
90699ce2b28
1da177e4c3f


6b544fcc8cd
258ec411308
1da177e4c3f

1da177e4c3f
c152cc1a90f
5e2040fd0a9
1da177e4c3f
b14c72127fb
1da177e4c3f


cd2abbfec84
0014c75be31

1da177e4c3f
10c0b3437c4
0014c75be31
7bf7420a318
860ff5ecbf3
1da177e4c3f
19f52a784f7

5e331095820
1da177e4c3f
963da55c4b9
cd2abbfec84
963da55c4b9
cd2abbfec84

cd2abbfec84
0014c75be31

1da177e4c3f

1da177e4c3f


b73c7ee25da
1da177e4c3f
d236d74c0d9
b788ee9c656
22c525b9767
1da177e4c3f
e972d7027c0


1da177e4c3f
33659ebbae2

1da177e4c3f
3c98bf347d9
5e2040fd0a9

28c7214bd8c

5a04cfa911f
1da177e4c3f


374e042c3e7
1da177e4c3f
97100fc816b

626542ca227
1da177e4c3f
97100fc816b
626542ca227
97100fc816b
1da177e4c3f

626542ca227

6f3848ac239
1da177e4c3f
54bb2074ce5
1da177e4c3f


83dd5735134
1da177e4c3f


5a04cfa911f


54bb2074ce5
6f3848ac239
1da177e4c3f
6f3848ac239
626542ca227
6f3848ac239

626542ca227
83dd5735134
2e8a6f89de6
0014c75be31
1da177e4c3f

83dd5735134
2e8a6f89de6
0014c75be31
1da177e4c3f

83dd5735134
c267cc1c4db
83dd5735134

1da177e4c3f

83dd5735134
1da177e4c3f


28c7214bd8c
f2e3ab52afb
6b544fcc8cd


b788ee9c656


dfb7e621fa1
5c4be57249e

b788ee9c656
1da177e4c3f

1da177e4c3f
3c98bf347d9

1da177e4c3f
5a04cfa911f
d236d74c0d9
1da177e4c3f
7bf7420a318
90699ce2b28
1da177e4c3f
346331f8282
1da177e4c3f

1da177e4c3f


2ac07d92060
1da177e4c3f

3c98bf347d9
49d8078ad1c
1da177e4c3f

de699ad595f
1da177e4c3f

3c98bf347d9

1da177e4c3f

0c8a6c7aead
1da177e4c3f


80ce45fd961
1da177e4c3f


5a04cfa911f
1da177e4c3f
2ac07d92060
d236d74c0d9
1da177e4c3f


b13345f39da
5a04cfa911f
1da177e4c3f


55ce3a129ea
1da177e4c3f

d236d74c0d9
55ce3a129ea
1da177e4c3f
e972d7027c0
1da177e4c3f
55ce3a129ea


1da177e4c3f
55ce3a129ea

e972d7027c0
55ce3a129ea
e972d7027c0
55ce3a129ea


8dcce408130

55ce3a129ea

e972d7027c0

55ce3a129ea


8dcce408130

55ce3a129ea


1da177e4c3f

d236d74c0d9

5a04cfa911f
1da177e4c3f
7bf7420a318
90699ce2b28
1da177e4c3f
860ff5ecbf3
1da177e4c3f
346331f8282
1da177e4c3f

ec0fdb01f80
1da177e4c3f

1da177e4c3f
54abf37e423
9798630a75c
1da177e4c3f
49d8078ad1c
963da55c4b9


1da177e4c3f

54abf37e423
1da177e4c3f


3c98bf347d9


1da177e4c3f
5a04cfa911f

1da177e4c3f

2ac07d92060
55ce3a129ea
d236d74c0d9
1da177e4c3f
54abf37e423
ec0fdb01f80
1da177e4c3f

55ce3a129ea


1da177e4c3f
55ce3a129ea


1da177e4c3f

ec0fdb01f80
5a04cfa911f
1da177e4c3f

1da177e4c3f

ec0fdb01f80
1da177e4c3f
55ce3a129ea
9798630a75c
1da177e4c3f
5a04cfa911f
ec0fdb01f80
1da177e4c3f


3c98bf347d9

1da177e4c3f
6bb11dd14f7
1da177e4c3f

64ea1b4ab7f
21d9c5d2275
1da177e4c3f
e972d7027c0

21d9c5d2275
6bb11dd14f7
8004a8c9744
64ea1b4ab7f

83dd5735134
64ea1b4ab7f
c9059598ea8
21d9c5d2275

963da55c4b9
21d9c5d2275


64ea1b4ab7f

963da55c4b9
c3a4d78c580
963da55c4b9
21d9c5d2275
963da55c4b9


1da177e4c3f
21d9c5d2275


21d9c5d2275

64ea1b4ab7f
1da177e4c3f

d236d74c0d9
1da177e4c3f
7bf7420a318
90699ce2b28
5a04cfa911f
d236d74c0d9
1da177e4c3f

d236d74c0d9

1da177e4c3f
7bf7420a318
90699ce2b28
346331f8282
1da177e4c3f

d236d74c0d9
1da177e4c3f
7bf7420a318
90699ce2b28
1da177e4c3f
346331f8282
1da177e4c3f

d236d74c0d9
1da177e4c3f
7bf7420a318
90699ce2b28
860ff5ecbf3
1da177e4c3f
346331f8282
1da177e4c3f

d9df937af4f
1da177e4c3f

55a5d291fd6
54abf37e423
077e3bdb9ec
5a04cfa911f
1da177e4c3f

963da55c4b9
6bb11dd14f7


07bd9686c50
963da55c4b9

1da177e4c3f
54abf37e423
1da177e4c3f

88f1b941c5c
1da177e4c3f

88f1b941c5c
1da177e4c3f
88f1b941c5c
1da177e4c3f
88f1b941c5c


1da177e4c3f

5e69bd959d1
1da177e4c3f


5a04cfa911f
1da177e4c3f

963da55c4b9

3c98bf347d9
1da177e4c3f
963da55c4b9
1da177e4c3f
6bb11dd14f7
1da177e4c3f
1da177e4c3f


1da177e4c3f
3c98bf347d9


5a04cfa911f
1da177e4c3f
2ac07d92060

d236d74c0d9
55ce3a129ea
8004a8c9744
e972d7027c0
8004a8c9744
1da177e4c3f
55ce3a129ea


1da177e4c3f
55ce3a129ea


1da177e4c3f


3c98bf347d9
5a04cfa911f

1da177e4c3f

1da177e4c3f

d59823fa44f


e972d7027c0
8004a8c9744
1da177e4c3f
5a04cfa911f


5a04cfa911f

2fc2111c272
5a04cfa911f
83042b24160
5a04cfa911f


1da177e4c3f


5a04cfa911f

1da177e4c3f

2ac07d92060
d236d74c0d9
5a04cfa911f
b6422013264
1da177e4c3f
e972d7027c0


1da177e4c3f


b6422013264
1da177e4c3f
5a04cfa911f
1da177e4c3f

54abf37e423
963da55c4b9
49d8078ad1c

1da177e4c3f
ec0fdb01f80
1da177e4c3f

1da177e4c3f
5a04cfa911f


b13345f39da
5a04cfa911f


1da177e4c3f


1da177e4c3f
3c98bf347d9
1da177e4c3f
3c98bf347d9


1da177e4c3f
3c98bf347d9


1da177e4c3f
5a04cfa911f

1da177e4c3f
5aeddf907f1
1da177e4c3f
07bd9686c50
dcd96379613
07bd9686c50
1da177e4c3f
e972d7027c0
1da177e4c3f
54abf37e423
49d8078ad1c
54bb2074ce5


1da177e4c3f
07bd9686c50
88f1b941c5c
8d06bfadb44
1da177e4c3f
07bd9686c50


49d8078ad1c

07bd9686c50


dcd96379613
07bd9686c50


1da177e4c3f
07bd9686c50
49d8078ad1c
1da177e4c3f


dcd96379613
07bd9686c50
1da177e4c3f

5a04cfa911f
1da177e4c3f

5aeddf907f1
1da177e4c3f
07bd9686c50
dcd96379613
88f1b941c5c
1da177e4c3f


e972d7027c0
1da177e4c3f

88f1b941c5c


07bd9686c50


dcd96379613
07bd9686c50


1da177e4c3f
07bd9686c50

1da177e4c3f

5a04cfa911f
1da177e4c3f
2ac07d92060
d236d74c0d9
1da177e4c3f


b13345f39da
1da177e4c3f


d99c9da2159

1da177e4c3f
d99c9da2159

5bd50dc6aa8
1da177e4c3f
d99c9da2159
1da177e4c3f
d99c9da2159

1da177e4c3f
d99c9da2159
1da177e4c3f

2ac07d92060
d236d74c0d9
5a04cfa911f
1da177e4c3f
e972d7027c0

5a04cfa911f
1da177e4c3f
5a04cfa911f


1da177e4c3f
5a04cfa911f
1da177e4c3f
5a04cfa911f


ec0fdb01f80
5a04cfa911f


ec0fdb01f80
5a04cfa911f


ec0fdb01f80
0c8a6c7aead
5a04cfa911f


0578042db31
385a4b8787c
5a04cfa911f
ec0fdb01f80
0c8a6c7aead
5a04cfa911f
49d8078ad1c

5a04cfa911f

ec0fdb01f80
5a04cfa911f

ec0fdb01f80
0c8a6c7aead
5a04cfa911f
5a04cfa911f

b13345f39da
5a04cfa911f


b13345f39da
5a04cfa911f


1da177e4c3f
5a04cfa911f
49d8078ad1c

5a04cfa911f
49d8078ad1c

5a04cfa911f

ec0fdb01f80
5a04cfa911f


ec0fdb01f80
5a04cfa911f


0578042db31
5a04cfa911f
1da177e4c3f
5a04cfa911f


0578042db31
5a04cfa911f


1da177e4c3f


d99c9da2159


1da177e4c3f
05227adff20
d99c9da2159
1da177e4c3f
5aeddf907f1
1da177e4c3f


54bb2074ce5
1da177e4c3f

e972d7027c0
1da177e4c3f
54abf37e423
d9df937af4f
1da177e4c3f


963da55c4b9
54bb2074ce5
55ce3a129ea
5a04cfa911f
1da177e4c3f


5a04cfa911f


ec0fdb01f80
5a04cfa911f
1da177e4c3f


05227adff20


2a48fc0ab24
05227adff20
2a48fc0ab24
05227adff20


3cffb9ce476


d236d74c0d9
837272b4f93
3cffb9ce476

837272b4f93
3cffb9ce476
54bb2074ce5
3cffb9ce476

54bb2074ce5
3cffb9ce476


837272b4f93


e972d7027c0


3cffb9ce476
1da177e4c3f
5a04cfa911f
1da177e4c3f


1da177e4c3f

8004a8c9744


cbba2fa7b2c

9d01e4cd7eb
04f4ac9d1bb
cbba2fa7b2c
8004a8c9744
04f4ac9d1bb
8004a8c9744
e972d7027c0


8004a8c9744
1da177e4c3f


1da177e4c3f
49d8078ad1c
1da177e4c3f


49d8078ad1c
1da177e4c3f


79ca743f68a
49d8078ad1c
1da177e4c3f

1da177e4c3f
3cffb9ce476
1da177e4c3f


49d8078ad1c
1da177e4c3f


3c98bf347d9
54abf37e423
0578042db31
385a4b8787c

1da177e4c3f

cbba2fa7b2c

1da177e4c3f


cbba2fa7b2c


1da177e4c3f


5a04cfa911f
1da177e4c3f


d9df937af4f
963da55c4b9

54bb2074ce5

963da55c4b9

1da177e4c3f


5a04cfa911f
1da177e4c3f
5aeddf907f1
1da177e4c3f
1da177e4c3f

cbba2fa7b2c

1da177e4c3f
8004a8c9744
e972d7027c0
1da177e4c3f
54abf37e423
1da177e4c3f
54abf37e423
1da177e4c3f
ec0fdb01f80
1da177e4c3f
f64eee7bb28
49d8078ad1c

1da177e4c3f
49d8078ad1c
54abf37e423
1da177e4c3f
0578042db31
385a4b8787c
1da177e4c3f

49d8078ad1c
1da177e4c3f
cbba2fa7b2c


1da177e4c3f


6d29c8f0abc
1da177e4c3f
1da177e4c3f
d236d74c0d9
41fa9f863ba
801bd32e205
6d29c8f0abc
1da177e4c3f
b13345f39da
6d29c8f0abc

1da177e4c3f

b13345f39da


41f81d545b6
801bd32e205


41f81d545b6
801bd32e205
41f81d545b6
1da177e4c3f


b6422013264

1da177e4c3f
5a04cfa911f
1da177e4c3f

d236d74c0d9
b13345f39da
b6422013264
47314fa4298
1da177e4c3f
b13345f39da
b6422013264

54bb2074ce5
b6422013264


1da177e4c3f

b13345f39da
b6422013264

cd740ab0f69

1da177e4c3f
cd740ab0f69


1da177e4c3f
b6422013264


cd740ab0f69
1da177e4c3f
b6422013264


cd740ab0f69
1da177e4c3f

b6422013264
0578042db31


42619d35c7a
0578042db31
b6422013264
54bb2074ce5
b6422013264
54bb2074ce5
1da177e4c3f

7662d046df0
8185d5aa93e


92f1f8fd804
8185d5aa93e

92f1f8fd804
8185d5aa93e
92f1f8fd804
8185d5aa93e
92f1f8fd804
8185d5aa93e


97100fc816b
92f1f8fd804
92f1f8fd804


92f1f8fd804


71bfc7a7c73
8185d5aa93e
7662d046df0
1da177e4c3f

3c98bf347d9
1da177e4c3f
3c98bf347d9


1da177e4c3f
3c98bf347d9

1da177e4c3f
5a04cfa911f
1da177e4c3f
83042b24160
1da177e4c3f
f73850a302d
b6422013264
1da177e4c3f
e972d7027c0


776bb0270ea
97100fc816b

4166c1993b9


97100fc816b
1da177e4c3f
97100fc816b
1da177e4c3f
4dde4492d85
97100fc816b

1da177e4c3f


54abf37e423
4dde4492d85
1da177e4c3f

3cffb9ce476
1da177e4c3f
f73850a302d

1da177e4c3f
b6422013264
f73850a302d
1da177e4c3f
f73850a302d
1da177e4c3f
83042b24160
b6422013264
1da177e4c3f
f73850a302d
1da177e4c3f

3c98bf347d9

1da177e4c3f
a792bd5a407

1da177e4c3f
83042b24160
b6422013264
f73850a302d

54bb2074ce5
97100fc816b
1da177e4c3f
1e874f44836
1da177e4c3f

4031bbe4bbe
1da177e4c3f

1da177e4c3f
7662d046df0
8fed4368417
1da177e4c3f

8fed4368417


1da177e4c3f

8fed4368417
1da177e4c3f
8fed4368417
1da177e4c3f


963da55c4b9
8604affde9d
97100fc816b
1da177e4c3f
dbc1272ed4a
5a04cfa911f

1da177e4c3f


ecfd80e4a51
6d703a81ad5
1da177e4c3f
6d703a81ad5
1da177e4c3f
1da177e4c3f
6d703a81ad5


1da177e4c3f

6d703a81ad5


1da177e4c3f
6d703a81ad5


1da177e4c3f
79cb380397c


1da177e4c3f

4031bbe4bbe
1da177e4c3f
7f3c868ba78
8604affde9d
4ef3b8f4a5c
8604affde9d

8604affde9d
4031bbe4bbe

1da177e4c3f
1da177e4c3f
7662d046df0
79cb380397c

7662d046df0
1da177e4c3f

3c98bf347d9
2b8693c0617
1da177e4c3f


05227adff20
1da177e4c3f

6038f373a3d
1da177e4c3f

a4600f81393
1da177e4c3f
6e9624b8cae

2a48fc0ab24
6e9624b8cae
2a48fc0ab24
1da177e4c3f
5a04cfa911f
1da177e4c3f

1da177e4c3f


a4600f81393
1da177e4c3f
5aeddf907f1
1da177e4c3f
2a48fc0ab24
1da177e4c3f
2a48fc0ab24
6e9624b8cae
1da177e4c3f


a4600f81393
1da177e4c3f

5aeddf907f1
1da177e4c3f
8a6cfeb6dec

2a48fc0ab24
8a6cfeb6dec
1da177e4c3f

2a48fc0ab24
8a6cfeb6dec
1da177e4c3f


83d5cde47de
1da177e4c3f
a4600f81393

8a6cfeb6dec
1da177e4c3f

4031bbe4bbe
1da177e4c3f


e972d7027c0


1da177e4c3f
2a924662b64
1da177e4c3f

2a924662b64
97100fc816b

5a04cfa911f

1da177e4c3f

5a04cfa911f
1da177e4c3f
5a04cfa911f

1da177e4c3f


8fed4368417


1da177e4c3f


cf8b8975c3c
1da177e4c3f


cf8b8975c3c
1da177e4c3f


3ee074bf432


d5dee80ad69
1da177e4c3f


8604affde9d
8fed4368417

1da177e4c3f


8604affde9d
1da177e4c3f

5a04cfa911f
1da177e4c3f
8604affde9d
d5dee80ad69
1da177e4c3f


17514e8a6f1
1da177e4c3f
d5dee80ad69


1da177e4c3f
5a04cfa911f

d5dee80ad69

1da177e4c3f
d5dee80ad69


1da177e4c3f

263756ec228
1da177e4c3f


9c14576886b


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075

  
/*
 * IDE ATAPI streaming tape driver.
 *
 * Copyright (C) 1995-1999  Gadi Oxman <gadio@netvision.net.il>
 * Copyright (C) 2003-2005  Bartlomiej Zolnierkiewicz
 *
 * This driver was constructed as a student project in the software laboratory
 * of the faculty of electrical engineering in the Technion - Israel's
 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
 *
 * It is hereby placed under the terms of the GNU general public license.
 * (See linux/COPYING).
 *
 * For a historical changelog see
 * Documentation/ide/ChangeLog.ide-tape.1995-2002
 */

#define DRV_NAME "ide-tape"

#define IDETAPE_VERSION "1.20"

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/completion.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <scsi/scsi.h>

#include <asm/byteorder.h>
#include <linux/irq.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/unaligned.h>
#include <linux/mtio.h>

/* define to see debug info */
#undef IDETAPE_DEBUG_LOG

#ifdef IDETAPE_DEBUG_LOG
#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args)
#else
#define ide_debug_log(lvl, fmt, args...) do {} while (0)
#endif

/**************************** Tunable parameters *****************************/
/*
 * After each failed packet command we issue a request sense command and retry
 * the packet command IDETAPE_MAX_PC_RETRIES times.
 *
 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
 */
#define IDETAPE_MAX_PC_RETRIES		3

/*
 * The following parameter is used to select the point in the internal tape fifo
 * in which we will start to refill the buffer. Decreasing the following
 * parameter will improve the system's latency and interactive response, while
 * using a high value might improve system throughput.
 */
#define IDETAPE_FIFO_THRESHOLD		2

/*
 * DSC polling parameters.
 *
 * Polling for DSC (a single bit in the status register) is a very important
 * function in ide-tape. There are two cases in which we poll for DSC:
 *
 * 1. Before a read/write packet command, to ensure that we can transfer data
 * from/to the tape's data buffers, without causing an actual media access.
 * In case the tape is not ready yet, we take out our request from the device
 * request queue, so that ide.c could service requests from the other device
 * on the same interface in the meantime.
 *
 * 2. After the successful initialization of a "media access packet command",
 * which is a command that can take a long time to complete (the interval can
 * range from several seconds to even an hour). Again, we postpone our request
 * in the middle to free the bus for the other device. The polling frequency
 * here should be lower than the read/write frequency since those media access
 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
 *
 * We also set a timeout for the timer, in case something goes wrong. The
 * timeout should be longer then the maximum execution time of a tape operation.
 */

/* DSC timings. */
#define IDETAPE_DSC_RW_MIN		5*HZ/100	/* 50 msec */
#define IDETAPE_DSC_RW_MAX		40*HZ/100	/* 400 msec */
#define IDETAPE_DSC_RW_TIMEOUT		2*60*HZ		/* 2 minutes */
#define IDETAPE_DSC_MA_FAST		2*HZ		/* 2 seconds */
#define IDETAPE_DSC_MA_THRESHOLD	5*60*HZ		/* 5 minutes */
#define IDETAPE_DSC_MA_SLOW		30*HZ		/* 30 seconds */
#define IDETAPE_DSC_MA_TIMEOUT		2*60*60*HZ	/* 2 hours */

/*************************** End of tunable parameters ***********************/

/* tape directions */
enum {
	IDETAPE_DIR_NONE  = (1 << 0),
	IDETAPE_DIR_READ  = (1 << 1),
	IDETAPE_DIR_WRITE = (1 << 2),
};

/* Tape door status */
#define DOOR_UNLOCKED			0
#define DOOR_LOCKED			1
#define DOOR_EXPLICITLY_LOCKED		2

/* Some defines for the SPACE command */
#define IDETAPE_SPACE_OVER_FILEMARK	1
#define IDETAPE_SPACE_TO_EOD		3

/* Some defines for the LOAD UNLOAD command */
#define IDETAPE_LU_LOAD_MASK		1
#define IDETAPE_LU_RETENSION_MASK	2
#define IDETAPE_LU_EOT_MASK		4

/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
#define IDETAPE_BLOCK_DESCRIPTOR	0
#define IDETAPE_CAPABILITIES_PAGE	0x2a

/*
 * Most of our global data which we need to save even as we leave the driver due
 * to an interrupt or a timer event is stored in the struct defined below.
 */
typedef struct ide_tape_obj {
	ide_drive_t		*drive;
	struct ide_driver	*driver;
	struct gendisk		*disk;
	struct device		dev;

	/* used by REQ_IDETAPE_{READ,WRITE} requests */
	struct ide_atapi_pc queued_pc;

	/*
	 * DSC polling variables.
	 *
	 * While polling for DSC we use postponed_rq to postpone the current
	 * request so that ide.c will be able to service pending requests on the
	 * other device. Note that at most we will have only one DSC (usually
	 * data transfer) request in the device request queue.
	 */
	bool postponed_rq;

	/* The time in which we started polling for DSC */
	unsigned long dsc_polling_start;
	/* Timer used to poll for dsc */
	struct timer_list dsc_timer;
	/* Read/Write dsc polling frequency */
	unsigned long best_dsc_rw_freq;
	unsigned long dsc_poll_freq;
	unsigned long dsc_timeout;

	/* Read position information */
	u8 partition;
	/* Current block */
	unsigned int first_frame;

	/* Last error information */
	u8 sense_key, asc, ascq;

	/* Character device operation */
	unsigned int minor;
	/* device name */
	char name[4];
	/* Current character device data transfer direction */
	u8 chrdev_dir;

	/* tape block size, usually 512 or 1024 bytes */
	unsigned short blk_size;
	int user_bs_factor;

	/* Copy of the tape's Capabilities and Mechanical Page */
	u8 caps[20];

	/*
	 * Active data transfer request parameters.
	 *
	 * At most, there is only one ide-tape originated data transfer request
	 * in the device request queue. This allows ide.c to easily service
	 * requests from the other device when we postpone our active request.
	 */

	/* Data buffer size chosen based on the tape's recommendation */
	int buffer_size;
	/* Staging buffer of buffer_size bytes */
	void *buf;
	/* The read/write cursor */
	void *cur;
	/* The number of valid bytes in buf */
	size_t valid;

	/* Measures average tape speed */
	unsigned long avg_time;
	int avg_size;
	int avg_speed;

	/* the door is currently locked */
	int door_locked;
	/* the tape hardware is write protected */
	char drv_write_prot;
	/* the tape is write protected (hardware or opened as read-only) */
	char write_prot;
} idetape_tape_t;

static DEFINE_MUTEX(ide_tape_mutex);
static DEFINE_MUTEX(idetape_ref_mutex);

static DEFINE_MUTEX(idetape_chrdev_mutex);

static struct class *idetape_sysfs_class;

static void ide_tape_release(struct device *);

static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];

static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev,
					 unsigned int i)
{
	struct ide_tape_obj *tape = NULL;

	mutex_lock(&idetape_ref_mutex);

	if (cdev)
		tape = idetape_devs[i];
	else
		tape = ide_drv_g(disk, ide_tape_obj);

	if (tape) {
		if (ide_device_get(tape->drive))
			tape = NULL;
		else
			get_device(&tape->dev);
	}

	mutex_unlock(&idetape_ref_mutex);
	return tape;
}

static void ide_tape_put(struct ide_tape_obj *tape)
{
	ide_drive_t *drive = tape->drive;

	mutex_lock(&idetape_ref_mutex);
	put_device(&tape->dev);
	ide_device_put(drive);
	mutex_unlock(&idetape_ref_mutex);
}

/*
 * called on each failed packet command retry to analyze the request sense. We
 * currently do not utilize this information.
 */
static void idetape_analyze_error(ide_drive_t *drive)
{
	idetape_tape_t *tape = drive->driver_data;
	struct ide_atapi_pc *pc = drive->failed_pc;
	struct request *rq = drive->hwif->rq;
	u8 *sense = bio_data(rq->bio);

	tape->sense_key = sense[2] & 0xF;
	tape->asc       = sense[12];
	tape->ascq      = sense[13];

	ide_debug_log(IDE_DBG_FUNC,
		      "cmd: 0x%x, sense key = %x, asc = %x, ascq = %x",
		      rq->cmd[0], tape->sense_key, tape->asc, tape->ascq);

	/* correct remaining bytes to transfer */
	if (pc->flags & PC_FLAG_DMA_ERROR)
		rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]);

	/*
	 * If error was the result of a zero-length read or write command,
	 * with sense key=5, asc=0x22, ascq=0, let it slide.  Some drives
	 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
	 */
	if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
	    /* length == 0 */
	    && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
		if (tape->sense_key == 5) {
			/* don't report an error, everything's ok */
			pc->error = 0;
			/* don't retry read/write */
			pc->flags |= PC_FLAG_ABORT;
		}
	}
	if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
		pc->error = IDE_DRV_ERROR_FILEMARK;
		pc->flags |= PC_FLAG_ABORT;
	}
	if (pc->c[0] == WRITE_6) {
		if ((sense[2] & 0x40) || (tape->sense_key == 0xd
		     && tape->asc == 0x0 && tape->ascq == 0x2)) {
			pc->error = IDE_DRV_ERROR_EOD;
			pc->flags |= PC_FLAG_ABORT;
		}
	}
	if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
		if (tape->sense_key == 8) {
			pc->error = IDE_DRV_ERROR_EOD;
			pc->flags |= PC_FLAG_ABORT;
		}
		if (!(pc->flags & PC_FLAG_ABORT) &&
		    (blk_rq_bytes(rq) - rq->resid_len))
			pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
	}
}

static void ide_tape_handle_dsc(ide_drive_t *);

static int ide_tape_callback(ide_drive_t *drive, int dsc)
{
	idetape_tape_t *tape = drive->driver_data;
	struct ide_atapi_pc *pc = drive->pc;
	struct request *rq = drive->hwif->rq;
	int uptodate = pc->error ? 0 : 1;
	int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;

	ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0],
		      dsc, err);

	if (dsc)
		ide_tape_handle_dsc(drive);

	if (drive->failed_pc == pc)
		drive->failed_pc = NULL;

	if (pc->c[0] == REQUEST_SENSE) {
		if (uptodate)
			idetape_analyze_error(drive);
		else
			printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
					"itself - Aborting request!\n");
	} else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
		unsigned int blocks =
			(blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size;

		tape->avg_size += blocks * tape->blk_size;

		if (time_after_eq(jiffies, tape->avg_time + HZ)) {
			tape->avg_speed = tape->avg_size * HZ /
				(jiffies - tape->avg_time) / 1024;
			tape->avg_size = 0;
			tape->avg_time = jiffies;
		}

		tape->first_frame += blocks;

		if (pc->error) {
			uptodate = 0;
			err = pc->error;
		}
	}
	rq->errors = err;

	return uptodate;
}

/*
 * Postpone the current request so that ide.c will be able to service requests
 * from another device on the same port while we are polling for DSC.
 */
static void ide_tape_stall_queue(ide_drive_t *drive)
{
	idetape_tape_t *tape = drive->driver_data;

	ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu",
		      drive->hwif->rq->cmd[0], tape->dsc_poll_freq);

	tape->postponed_rq = true;

	ide_stall_queue(drive, tape->dsc_poll_freq);
}

static void ide_tape_handle_dsc(ide_drive_t *drive)
{
	idetape_tape_t *tape = drive->driver_data;

	/* Media access command */
	tape->dsc_polling_start = jiffies;
	tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
	tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
	/* Allow ide.c to handle other requests */
	ide_tape_stall_queue(drive);
}

/*
 * Packet Command Interface
 *
 * The current Packet Command is available in drive->pc, and will not change
 * until we finish handling it. Each packet command is associated with a
 * callback function that will be called when the command is finished.
 *
 * The handling will be done in three stages:
 *
 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set
 * the interrupt handler to ide_pc_intr.
 *
 * 2. On each interrupt, ide_pc_intr will be called. This step will be
 * repeated until the device signals us that no more interrupts will be issued.
 *
 * 3. ATAPI Tape media access commands have immediate status with a delayed
 * process. In case of a successful initiation of a media access packet command,
 * the DSC bit will be set when the actual execution of the command is finished.
 * Since the tape drive will not issue an interrupt, we have to poll for this
 * event. In this case, we define the request as "low priority request" by
 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
 * exit the driver.
 *
 * ide.c will then give higher priority to requests which originate from the
 * other device, until will change rq_status to RQ_ACTIVE.
 *
 * 4. When the packet command is finished, it will be checked for errors.
 *
 * 5. In case an error was found, we queue a request sense packet command in
 * front of the request queue and retry the operation up to
 * IDETAPE_MAX_PC_RETRIES times.
 *
 * 6. In case no error was found, or we decided to give up and not to retry
 * again, the callback function will be called and then we will handle the next
 * request.
 */

static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
					 struct ide_cmd *cmd,
					 struct ide_atapi_pc *pc)
{
	idetape_tape_t *tape = drive->driver_data;
	struct request *rq = drive->hwif->rq;

	if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
		drive->failed_pc = pc;

	/* Set the current packet command */
	drive->pc = pc;

	if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
		(pc->flags & PC_FLAG_ABORT)) {

		/*
		 * We will "abort" retrying a packet command in case legitimate
		 * error code was received (crossing a filemark, or end of the
		 * media, for example).
		 */
		if (!(pc->flags & PC_FLAG_ABORT)) {
			if (!(pc->c[0] == TEST_UNIT_READY &&
			      tape->sense_key == 2 && tape->asc == 4 &&
			     (tape->ascq == 1 || tape->ascq == 8))) {
				printk(KERN_ERR "ide-tape: %s: I/O error, "
						"pc = %2x, key = %2x, "
						"asc = %2x, ascq = %2x\n",
						tape->name, pc->c[0],
						tape->sense_key, tape->asc,
						tape->ascq);
			}
			/* Giving up */
			pc->error = IDE_DRV_ERROR_GENERAL;
		}

		drive->failed_pc = NULL;
		drive->pc_callback(drive, 0);
		ide_complete_rq(drive, -EIO, blk_rq_bytes(rq));
		return ide_stopped;
	}
	ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", pc->retries,
		      pc->c[0]);

	pc->retries++;

	return ide_issue_pc(drive, cmd);
}

/* A mode sense command is used to "sense" tape parameters. */
static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
{
	ide_init_pc(pc);
	pc->c[0] = MODE_SENSE;
	if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
		/* DBD = 1 - Don't return block descriptors */
		pc->c[1] = 8;
	pc->c[2] = page_code;
	/*
	 * Changed pc->c[3] to 0 (255 will at best return unused info).
	 *
	 * For SCSI this byte is defined as subpage instead of high byte
	 * of length and some IDE drives seem to interpret it this way
	 * and return an error when 255 is used.
	 */
	pc->c[3] = 0;
	/* We will just discard data in that case */
	pc->c[4] = 255;
	if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
		pc->req_xfer = 12;
	else if (page_code == IDETAPE_CAPABILITIES_PAGE)
		pc->req_xfer = 24;
	else
		pc->req_xfer = 50;
}

static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	idetape_tape_t *tape = drive->driver_data;
	struct ide_atapi_pc *pc = drive->pc;
	u8 stat;

	stat = hwif->tp_ops->read_status(hwif);

	if (stat & ATA_DSC) {
		if (stat & ATA_ERR) {
			/* Error detected */
			if (pc->c[0] != TEST_UNIT_READY)
				printk(KERN_ERR "ide-tape: %s: I/O error, ",
						tape->name);
			/* Retry operation */
			ide_retry_pc(drive);
			return ide_stopped;
		}
		pc->error = 0;
	} else {
		pc->error = IDE_DRV_ERROR_GENERAL;
		drive->failed_pc = NULL;
	}
	drive->pc_callback(drive, 0);
	return ide_stopped;
}

static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
				   struct ide_atapi_pc *pc, struct request *rq,
				   u8 opcode)
{
	unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9);

	ide_init_pc(pc);
	put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
	pc->c[1] = 1;

	if (blk_rq_bytes(rq) == tape->buffer_size)
		pc->flags |= PC_FLAG_DMA_OK;

	if (opcode == READ_6)
		pc->c[0] = READ_6;
	else if (opcode == WRITE_6) {
		pc->c[0] = WRITE_6;
		pc->flags |= PC_FLAG_WRITING;
	}

	memcpy(rq->cmd, pc->c, 12);
}

static ide_startstop_t idetape_do_request(ide_drive_t *drive,
					  struct request *rq, sector_t block)
{
	ide_hwif_t *hwif = drive->hwif;
	idetape_tape_t *tape = drive->driver_data;
	struct ide_atapi_pc *pc = NULL;
	struct ide_cmd cmd;
	u8 stat;

	ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u",
		      rq->cmd[0], (unsigned long long)blk_rq_pos(rq),
		      blk_rq_sectors(rq));

	BUG_ON(!(rq->cmd_type == REQ_TYPE_SPECIAL ||
		 rq->cmd_type == REQ_TYPE_SENSE));

	/* Retry a failed packet command */
	if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
		pc = drive->failed_pc;
		goto out;
	}

	/*
	 * If the tape is still busy, postpone our request and service
	 * the other device meanwhile.
	 */
	stat = hwif->tp_ops->read_status(hwif);

	if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
	    (rq->cmd[13] & REQ_IDETAPE_PC2) == 0)
		drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;

	if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
		drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
		drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
	}

	if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) &&
	    !(stat & ATA_DSC)) {
		if (!tape->postponed_rq) {
			tape->dsc_polling_start = jiffies;
			tape->dsc_poll_freq = tape->best_dsc_rw_freq;
			tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
		} else if (time_after(jiffies, tape->dsc_timeout)) {
			printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
				tape->name);
			if (rq->cmd[13] & REQ_IDETAPE_PC2) {
				idetape_media_access_finished(drive);
				return ide_stopped;
			} else {
				return ide_do_reset(drive);
			}
		} else if (time_after(jiffies,
					tape->dsc_polling_start +
					IDETAPE_DSC_MA_THRESHOLD))
			tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
		ide_tape_stall_queue(drive);
		return ide_stopped;
	} else {
		drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC;
		tape->postponed_rq = false;
	}

	if (rq->cmd[13] & REQ_IDETAPE_READ) {
		pc = &tape->queued_pc;
		ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
		goto out;
	}
	if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
		pc = &tape->queued_pc;
		ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
		goto out;
	}
	if (rq->cmd[13] & REQ_IDETAPE_PC1) {
		pc = (struct ide_atapi_pc *)rq->special;
		rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
		rq->cmd[13] |= REQ_IDETAPE_PC2;
		goto out;
	}
	if (rq->cmd[13] & REQ_IDETAPE_PC2) {
		idetape_media_access_finished(drive);
		return ide_stopped;
	}
	BUG();

out:
	/* prepare sense request for this command */
	ide_prep_sense(drive, rq);

	memset(&cmd, 0, sizeof(cmd));

	if (rq_data_dir(rq))
		cmd.tf_flags |= IDE_TFLAG_WRITE;

	cmd.rq = rq;

	ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
	ide_map_sg(drive, &cmd);

	return ide_tape_issue_pc(drive, &cmd, pc);
}

/*
 * Write a filemark if write_filemark=1. Flush the device buffers without
 * writing a filemark otherwise.
 */
static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
		struct ide_atapi_pc *pc, int write_filemark)
{
	ide_init_pc(pc);
	pc->c[0] = WRITE_FILEMARKS;
	pc->c[4] = write_filemark;
	pc->flags |= PC_FLAG_WAIT_FOR_DSC;
}

static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
{
	idetape_tape_t *tape = drive->driver_data;
	struct gendisk *disk = tape->disk;
	int load_attempted = 0;

	/* Wait for the tape to become ready */
	set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags);
	timeout += jiffies;
	while (time_before(jiffies, timeout)) {
		if (ide_do_test_unit_ready(drive, disk) == 0)
			return 0;
		if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
		    || (tape->asc == 0x3A)) {
			/* no media */
			if (load_attempted)
				return -ENOMEDIUM;
			ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
			load_attempted = 1;
		/* not about to be ready */
		} else if (!(tape->sense_key == 2 && tape->asc == 4 &&
			     (tape->ascq == 1 || tape->ascq == 8)))
			return -EIO;
		msleep(100);
	}
	return -EIO;
}

static int idetape_flush_tape_buffers(ide_drive_t *drive)
{
	struct ide_tape_obj *tape = drive->driver_data;
	struct ide_atapi_pc pc;
	int rc;

	idetape_create_write_filemark_cmd(drive, &pc, 0);
	rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0);
	if (rc)
		return rc;
	idetape_wait_ready(drive, 60 * 5 * HZ);
	return 0;
}

static int ide_tape_read_position(ide_drive_t *drive)
{
	idetape_tape_t *tape = drive->driver_data;
	struct ide_atapi_pc pc;
	u8 buf[20];

	ide_debug_log(IDE_DBG_FUNC, "enter");

	/* prep cmd */
	ide_init_pc(&pc);
	pc.c[0] = READ_POSITION;
	pc.req_xfer = 20;

	if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer))
		return -1;

	if (!pc.error) {
		ide_debug_log(IDE_DBG_FUNC, "BOP - %s",
				(buf[0] & 0x80) ? "Yes" : "No");
		ide_debug_log(IDE_DBG_FUNC, "EOP - %s",
				(buf[0] & 0x40) ? "Yes" : "No");

		if (buf[0] & 0x4) {
			printk(KERN_INFO "ide-tape: Block location is unknown"
					 "to the tape\n");
			clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
				  &drive->atapi_flags);
			return -1;
		} else {
			ide_debug_log(IDE_DBG_FUNC, "Block Location: %u",
				      be32_to_cpup((__be32 *)&buf[4]));

			tape->partition = buf[1];
			tape->first_frame = be32_to_cpup((__be32 *)&buf[4]);
			set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
				&drive->atapi_flags);
		}
	}

	return tape->first_frame;
}

static void idetape_create_locate_cmd(ide_drive_t *drive,
		struct ide_atapi_pc *pc,
		unsigned int block, u8 partition, int skip)
{
	ide_init_pc(pc);
	pc->c[0] = POSITION_TO_ELEMENT;
	pc->c[1] = 2;
	put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
	pc->c[8] = partition;
	pc->flags |= PC_FLAG_WAIT_FOR_DSC;
}

static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
{
	idetape_tape_t *tape = drive->driver_data;

	if (tape->chrdev_dir != IDETAPE_DIR_READ)
		return;

	clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags);
	tape->valid = 0;
	if (tape->buf != NULL) {
		kfree(tape->buf);
		tape->buf = NULL;
	}

	tape->chrdev_dir = IDETAPE_DIR_NONE;
}

/*
 * Position the tape to the requested block using the LOCATE packet command.
 * A READ POSITION command is then issued to check where we are positioned. Like
 * all higher level operations, we queue the commands at the tail of the request
 * queue and wait for their completion.
 */
static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
		u8 partition, int skip)
{
	idetape_tape_t *tape = drive->driver_data;
	struct gendisk *disk = tape->disk;
	int ret;
	struct ide_atapi_pc pc;

	if (tape->chrdev_dir == IDETAPE_DIR_READ)
		__ide_tape_discard_merge_buffer(drive);
	idetape_wait_ready(drive, 60 * 5 * HZ);
	idetape_create_locate_cmd(drive, &pc, block, partition, skip);
	ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
	if (ret)
		return ret;

	ret = ide_tape_read_position(drive);
	if (ret < 0)
		return ret;
	return 0;
}

static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
					  int restore_position)
{
	idetape_tape_t *tape = drive->driver_data;
	int seek, position;

	__ide_tape_discard_merge_buffer(drive);
	if (restore_position) {
		position = ide_tape_read_position(drive);
		seek = position > 0 ? position : 0;
		if (idetape_position_tape(drive, seek, 0, 0)) {
			printk(KERN_INFO "ide-tape: %s: position_tape failed in"
					 " %s\n", tape->name, __func__);
			return;
		}
	}
}

/*
 * Generate a read/write request for the block device interface and wait for it
 * to be serviced.
 */
static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
{
	idetape_tape_t *tape = drive->driver_data;
	struct request *rq;
	int ret;

	ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, size: %d", cmd, size);

	BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE);
	BUG_ON(size < 0 || size % tape->blk_size);

	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_SPECIAL;
	rq->cmd[13] = cmd;
	rq->rq_disk = tape->disk;
	rq->__sector = tape->first_frame;

	if (size) {
		ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
				      __GFP_WAIT);
		if (ret)
			goto out_put;
	}

	blk_execute_rq(drive->queue, tape->disk, rq, 0);

	/* calculate the number of transferred bytes and update buffer state */
	size -= rq->resid_len;
	tape->cur = tape->buf;
	if (cmd == REQ_IDETAPE_READ)
		tape->valid = size;
	else
		tape->valid = 0;

	ret = size;
	if (rq->errors == IDE_DRV_ERROR_GENERAL)
		ret = -EIO;
out_put:
	blk_put_request(rq);
	return ret;
}

static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
{
	ide_init_pc(pc);
	pc->c[0] = INQUIRY;
	pc->c[4] = 254;
	pc->req_xfer = 254;
}

static void idetape_create_rewind_cmd(ide_drive_t *drive,
		struct ide_atapi_pc *pc)
{
	ide_init_pc(pc);
	pc->c[0] = REZERO_UNIT;
	pc->flags |= PC_FLAG_WAIT_FOR_DSC;
}

static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
{
	ide_init_pc(pc);
	pc->c[0] = ERASE;
	pc->c[1] = 1;
	pc->flags |= PC_FLAG_WAIT_FOR_DSC;
}

static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
{
	ide_init_pc(pc);
	pc->c[0] = SPACE;
	put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
	pc->c[1] = cmd;
	pc->flags |= PC_FLAG_WAIT_FOR_DSC;
}

static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
{
	idetape_tape_t *tape = drive->driver_data;

	if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
		printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
				" but we are not writing.\n");
		return;
	}
	if (tape->buf) {
		size_t aligned = roundup(tape->valid, tape->blk_size);

		memset(tape->cur, 0, aligned - tape->valid);
		idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned);
		kfree(tape->buf);
		tape->buf = NULL;
	}
	tape->chrdev_dir = IDETAPE_DIR_NONE;
}

static int idetape_init_rw(ide_drive_t *drive, int dir)
{
	idetape_tape_t *tape = drive->driver_data;
	int rc;

	BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE);

	if (tape->chrdev_dir == dir)
		return 0;

	if (tape->chrdev_dir == IDETAPE_DIR_READ)
		ide_tape_discard_merge_buffer(drive, 1);
	else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
		ide_tape_flush_merge_buffer(drive);
		idetape_flush_tape_buffers(drive);
	}

	if (tape->buf || tape->valid) {
		printk(KERN_ERR "ide-tape: valid should be 0 now\n");
		tape->valid = 0;
	}

	tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
	if (!tape->buf)
		return -ENOMEM;
	tape->chrdev_dir = dir;
	tape->cur = tape->buf;

	/*
	 * Issue a 0 rw command to ensure that DSC handshake is
	 * switched from completion mode to buffer available mode.  No
	 * point in issuing this if DSC overlap isn't supported, some
	 * drives (Seagate STT3401A) will return an error.
	 */
	if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
		int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ
						  : REQ_IDETAPE_WRITE;

		rc = idetape_queue_rw_tail(drive, cmd, 0);
		if (rc < 0) {
			kfree(tape->buf);
			tape->buf = NULL;
			tape->chrdev_dir = IDETAPE_DIR_NONE;
			return rc;
		}
	}

	return 0;
}

static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
{
	idetape_tape_t *tape = drive->driver_data;

	memset(tape->buf, 0, tape->buffer_size);

	while (bcount) {
		unsigned int count = min(tape->buffer_size, bcount);

		idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count);
		bcount -= count;
	}
}

/*
 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
 * currently support only one partition.
 */
static int idetape_rewind_tape(ide_drive_t *drive)
{
	struct ide_tape_obj *tape = drive->driver_data;
	struct gendisk *disk = tape->disk;
	struct ide_atapi_pc pc;
	int ret;

	ide_debug_log(IDE_DBG_FUNC, "enter");

	idetape_create_rewind_cmd(drive, &pc);
	ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
	if (ret)
		return ret;

	ret = ide_tape_read_position(drive);
	if (ret < 0)
		return ret;
	return 0;
}

/* mtio.h compatible commands should be issued to the chrdev interface. */
static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
				unsigned long arg)
{
	idetape_tape_t *tape = drive->driver_data;
	void __user *argp = (void __user *)arg;

	struct idetape_config {
		int dsc_rw_frequency;
		int dsc_media_access_frequency;
		int nr_stages;
	} config;

	ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%04x", cmd);

	switch (cmd) {
	case 0x0340:
		if (copy_from_user(&config, argp, sizeof(config)))
			return -EFAULT;
		tape->best_dsc_rw_freq = config.dsc_rw_frequency;
		break;
	case 0x0350:
		memset(&config, 0, sizeof(config));
		config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
		config.nr_stages = 1;