Blame view
fs/block_dev.c
53.9 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 |
/* * linux/fs/block_dev.c * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE */ |
1da177e4c Linux-2.6.12-rc2 |
7 8 9 10 11 12 |
#include <linux/init.h> #include <linux/mm.h> #include <linux/fcntl.h> #include <linux/slab.h> #include <linux/kmod.h> #include <linux/major.h> |
7db9cfd38 devscgroup: check... |
13 |
#include <linux/device_cgroup.h> |
1da177e4c Linux-2.6.12-rc2 |
14 15 |
#include <linux/highmem.h> #include <linux/blkdev.h> |
66114cad6 writeback: separa... |
16 |
#include <linux/backing-dev.h> |
1da177e4c Linux-2.6.12-rc2 |
17 18 |
#include <linux/module.h> #include <linux/blkpg.h> |
b502bd115 magic.h: move som... |
19 |
#include <linux/magic.h> |
b0686260f dax: introduce da... |
20 |
#include <linux/dax.h> |
1da177e4c Linux-2.6.12-rc2 |
21 |
#include <linux/buffer_head.h> |
ff01bb483 fs: move code out... |
22 |
#include <linux/swap.h> |
585d3bc06 fs: move bdev cod... |
23 |
#include <linux/pagevec.h> |
811d736f9 [PATCH] BLOCK: Di... |
24 |
#include <linux/writeback.h> |
1da177e4c Linux-2.6.12-rc2 |
25 26 27 28 |
#include <linux/mpage.h> #include <linux/mount.h> #include <linux/uio.h> #include <linux/namei.h> |
1368c4f24 is_power_of_2 in ... |
29 |
#include <linux/log2.h> |
ff01bb483 fs: move code out... |
30 |
#include <linux/cleancache.h> |
c94c2acf8 dax: move DAX-rel... |
31 |
#include <linux/dax.h> |
acc93d30d Revert "block: en... |
32 |
#include <linux/badblocks.h> |
189ce2b9d block: fast-path ... |
33 |
#include <linux/task_io_accounting_ops.h> |
25f4c4141 block: implement ... |
34 |
#include <linux/falloc.h> |
7c0f6ba68 Replace <asm/uacc... |
35 |
#include <linux/uaccess.h> |
07f3f05c1 [PATCH] BLOCK: Mo... |
36 |
#include "internal.h" |
1da177e4c Linux-2.6.12-rc2 |
37 38 39 40 41 |
struct bdev_inode { struct block_device bdev; struct inode vfs_inode; }; |
4c54ac62d make struct def_b... |
42 |
static const struct address_space_operations def_blk_aops; |
1da177e4c Linux-2.6.12-rc2 |
43 44 45 46 |
static inline struct bdev_inode *BDEV_I(struct inode *inode) { return container_of(inode, struct bdev_inode, vfs_inode); } |
ff5053f66 bdi: Remove "inli... |
47 |
struct block_device *I_BDEV(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
48 49 50 |
{ return &BDEV_I(inode)->bdev; } |
1da177e4c Linux-2.6.12-rc2 |
51 |
EXPORT_SYMBOL(I_BDEV); |
dbd3ca507 fs/block_dev.c: R... |
52 |
static void bdev_write_inode(struct block_device *bdev) |
564f00f6c block_dev: only w... |
53 |
{ |
dbd3ca507 fs/block_dev.c: R... |
54 55 |
struct inode *inode = bdev->bd_inode; int ret; |
564f00f6c block_dev: only w... |
56 57 58 |
spin_lock(&inode->i_lock); while (inode->i_state & I_DIRTY) { spin_unlock(&inode->i_lock); |
dbd3ca507 fs/block_dev.c: R... |
59 60 61 62 63 64 65 66 |
ret = write_inode_now(inode, true); if (ret) { char name[BDEVNAME_SIZE]; pr_warn_ratelimited("VFS: Dirty inode writeback failed " "for block device %s (err=%d). ", bdevname(bdev, name), ret); } |
564f00f6c block_dev: only w... |
67 68 69 70 |
spin_lock(&inode->i_lock); } spin_unlock(&inode->i_lock); } |
f9a14399a mm: optimize kill... |
71 |
/* Kill _all_ buffers and pagecache , dirty or not.. */ |
ff01bb483 fs: move code out... |
72 |
void kill_bdev(struct block_device *bdev) |
1da177e4c Linux-2.6.12-rc2 |
73 |
{ |
ff01bb483 fs: move code out... |
74 |
struct address_space *mapping = bdev->bd_inode->i_mapping; |
f9fe48bec dax: support dirt... |
75 |
if (mapping->nrpages == 0 && mapping->nrexceptional == 0) |
f9a14399a mm: optimize kill... |
76 |
return; |
ff01bb483 fs: move code out... |
77 |
|
f9a14399a mm: optimize kill... |
78 |
invalidate_bh_lrus(); |
ff01bb483 fs: move code out... |
79 |
truncate_inode_pages(mapping, 0); |
1da177e4c Linux-2.6.12-rc2 |
80 |
} |
ff01bb483 fs: move code out... |
81 82 83 84 85 86 |
EXPORT_SYMBOL(kill_bdev); /* Invalidate clean unused buffers and pagecache. */ void invalidate_bdev(struct block_device *bdev) { struct address_space *mapping = bdev->bd_inode->i_mapping; |
a5f6a6a9c fs/block_dev: alw... |
87 88 89 90 91 |
if (mapping->nrpages) { invalidate_bh_lrus(); lru_add_drain_all(); /* make sure all lru add caches are flushed */ invalidate_mapping_pages(mapping, 0, -1); } |
ff01bb483 fs: move code out... |
92 93 94 |
/* 99% of the time, we don't need to flush the cleancache on the bdev. * But, for the strange corners, lets be cautious */ |
3167760f8 mm: cleancache: s... |
95 |
cleancache_invalidate_inode(mapping); |
ff01bb483 fs: move code out... |
96 97 |
} EXPORT_SYMBOL(invalidate_bdev); |
1da177e4c Linux-2.6.12-rc2 |
98 |
|
1e11b1d63 blockdev: Fix liv... |
99 100 101 102 103 104 105 106 107 108 109 110 111 |
static void set_init_blocksize(struct block_device *bdev) { unsigned bsize = bdev_logical_block_size(bdev); loff_t size = i_size_read(bdev->bd_inode); while (bsize < PAGE_SIZE) { if (size & bsize) break; bsize <<= 1; } bdev->bd_block_size = bsize; bdev->bd_inode->i_blkbits = blksize_bits(bsize); } |
1da177e4c Linux-2.6.12-rc2 |
112 113 114 |
int set_blocksize(struct block_device *bdev, int size) { /* Size must be a power of two, and between 512 and PAGE_SIZE */ |
1368c4f24 is_power_of_2 in ... |
115 |
if (size > PAGE_SIZE || size < 512 || !is_power_of_2(size)) |
1da177e4c Linux-2.6.12-rc2 |
116 117 118 |
return -EINVAL; /* Size cannot be smaller than the size supported by the device */ |
e1defc4ff block: Do away wi... |
119 |
if (size < bdev_logical_block_size(bdev)) |
1da177e4c Linux-2.6.12-rc2 |
120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 |
return -EINVAL; /* Don't change the size if it is same as current */ if (bdev->bd_block_size != size) { sync_blockdev(bdev); bdev->bd_block_size = size; bdev->bd_inode->i_blkbits = blksize_bits(size); kill_bdev(bdev); } return 0; } EXPORT_SYMBOL(set_blocksize); int sb_set_blocksize(struct super_block *sb, int size) { |
1da177e4c Linux-2.6.12-rc2 |
136 137 138 139 140 |
if (set_blocksize(sb->s_bdev, size)) return 0; /* If we get here, we know size is power of two * and it's value is between 512 and PAGE_SIZE */ sb->s_blocksize = size; |
38885bd4c [PATCH] sb_set_bl... |
141 |
sb->s_blocksize_bits = blksize_bits(size); |
1da177e4c Linux-2.6.12-rc2 |
142 143 144 145 146 147 148 |
return sb->s_blocksize; } EXPORT_SYMBOL(sb_set_blocksize); int sb_min_blocksize(struct super_block *sb, int size) { |
e1defc4ff block: Do away wi... |
149 |
int minsize = bdev_logical_block_size(sb->s_bdev); |
1da177e4c Linux-2.6.12-rc2 |
150 151 152 153 154 155 156 157 158 159 160 |
if (size < minsize) size = minsize; return sb_set_blocksize(sb, size); } EXPORT_SYMBOL(sb_min_blocksize); static int blkdev_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh, int create) { |
1da177e4c Linux-2.6.12-rc2 |
161 162 163 164 165 |
bh->b_bdev = I_BDEV(inode); bh->b_blocknr = iblock; set_buffer_mapped(bh); return 0; } |
4ebb16ca9 block: introduce ... |
166 167 168 169 |
static struct inode *bdev_file_inode(struct file *file) { return file->f_mapping->host; } |
78250c02d block: make __blk... |
170 171 172 173 174 175 176 177 178 |
static unsigned int dio_bio_write_op(struct kiocb *iocb) { unsigned int op = REQ_OP_WRITE | REQ_SYNC | REQ_IDLE; /* avoid the need for a I/O completion work item */ if (iocb->ki_flags & IOCB_DSYNC) op |= REQ_FUA; return op; } |
189ce2b9d block: fast-path ... |
179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 |
#define DIO_INLINE_BIO_VECS 4 static void blkdev_bio_end_io_simple(struct bio *bio) { struct task_struct *waiter = bio->bi_private; WRITE_ONCE(bio->bi_private, NULL); wake_up_process(waiter); } static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) { struct file *file = iocb->ki_filp; struct block_device *bdev = I_BDEV(bdev_file_inode(file)); |
72ecad22d block: support a ... |
195 |
struct bio_vec inline_vecs[DIO_INLINE_BIO_VECS], *vecs, *bvec; |
189ce2b9d block: fast-path ... |
196 197 198 199 200 201 |
loff_t pos = iocb->ki_pos; bool should_dirty = false; struct bio bio; ssize_t ret; blk_qc_t qc; int i; |
9a794fb9b block_dev: get ri... |
202 203 |
if ((pos | iov_iter_alignment(iter)) & (bdev_logical_block_size(bdev) - 1)) |
189ce2b9d block: fast-path ... |
204 |
return -EINVAL; |
72ecad22d block: support a ... |
205 206 207 |
if (nr_pages <= DIO_INLINE_BIO_VECS) vecs = inline_vecs; else { |
6da2ec560 treewide: kmalloc... |
208 209 |
vecs = kmalloc_array(nr_pages, sizeof(struct bio_vec), GFP_KERNEL); |
72ecad22d block: support a ... |
210 211 212 |
if (!vecs) return -ENOMEM; } |
3a83f4677 block: bio: pass ... |
213 |
bio_init(&bio, vecs, nr_pages); |
74d46992e block: replace bi... |
214 |
bio_set_dev(&bio, bdev); |
4d1a47654 block_dev: Fixed ... |
215 |
bio.bi_iter.bi_sector = pos >> 9; |
45d06cf70 fs: add O_DIRECT ... |
216 |
bio.bi_write_hint = iocb->ki_hint; |
189ce2b9d block: fast-path ... |
217 218 |
bio.bi_private = current; bio.bi_end_io = blkdev_bio_end_io_simple; |
074111ca5 fs: blkdev set bi... |
219 |
bio.bi_ioprio = iocb->ki_ioprio; |
189ce2b9d block: fast-path ... |
220 221 222 |
ret = bio_iov_iter_get_pages(&bio, iter); if (unlikely(ret)) |
9362dd110 blkdev: __blkdev_... |
223 |
goto out; |
189ce2b9d block: fast-path ... |
224 225 226 |
ret = bio.bi_iter.bi_size; if (iov_iter_rw(iter) == READ) { |
78250c02d block: make __blk... |
227 |
bio.bi_opf = REQ_OP_READ; |
189ce2b9d block: fast-path ... |
228 229 230 |
if (iter_is_iovec(iter)) should_dirty = true; } else { |
78250c02d block: make __blk... |
231 |
bio.bi_opf = dio_bio_write_op(iocb); |
189ce2b9d block: fast-path ... |
232 233 234 235 236 237 238 239 240 |
task_io_account_write(ret); } qc = submit_bio(&bio); for (;;) { set_current_state(TASK_UNINTERRUPTIBLE); if (!READ_ONCE(bio.bi_private)) break; if (!(iocb->ki_flags & IOCB_HIPRI) || |
ea435e1b9 block: add a poll... |
241 |
!blk_poll(bdev_get_queue(bdev), qc)) |
189ce2b9d block: fast-path ... |
242 243 244 245 246 247 248 249 250 |
io_schedule(); } __set_current_state(TASK_RUNNING); bio_for_each_segment_all(bvec, &bio, i) { if (should_dirty && !PageCompound(bvec->bv_page)) set_page_dirty_lock(bvec->bv_page); put_page(bvec->bv_page); } |
4e4cbee93 block: switch bio... |
251 |
if (unlikely(bio.bi_status)) |
c6b1e36c8 Merge branch 'for... |
252 |
ret = blk_status_to_errno(bio.bi_status); |
9ae3b3f52 block: provide bi... |
253 |
|
9362dd110 blkdev: __blkdev_... |
254 255 256 |
out: if (vecs != inline_vecs) kfree(vecs); |
9ae3b3f52 block: provide bi... |
257 |
bio_uninit(&bio); |
189ce2b9d block: fast-path ... |
258 259 |
return ret; } |
542ff7bf1 block: new direct... |
260 261 262 263 264 265 266 267 268 269 270 271 |
struct blkdev_dio { union { struct kiocb *iocb; struct task_struct *waiter; }; size_t size; atomic_t ref; bool multi_bio : 1; bool should_dirty : 1; bool is_sync : 1; struct bio bio; }; |
52190f8ab fs: convert block... |
272 |
static struct bio_set blkdev_dio_pool; |
542ff7bf1 block: new direct... |
273 274 275 276 277 |
static void blkdev_bio_end_io(struct bio *bio) { struct blkdev_dio *dio = bio->bi_private; bool should_dirty = dio->should_dirty; |
543bb48dc block: fix the re... |
278 279 280 281 |
if (bio->bi_status && !dio->bio.bi_status) dio->bio.bi_status = bio->bi_status; if (!dio->multi_bio || atomic_dec_and_test(&dio->ref)) { |
542ff7bf1 block: new direct... |
282 283 |
if (!dio->is_sync) { struct kiocb *iocb = dio->iocb; |
4e4cbee93 block: switch bio... |
284 |
ssize_t ret; |
542ff7bf1 block: new direct... |
285 |
|
4e4cbee93 block: switch bio... |
286 |
if (likely(!dio->bio.bi_status)) { |
542ff7bf1 block: new direct... |
287 288 |
ret = dio->size; iocb->ki_pos += ret; |
4e4cbee93 block: switch bio... |
289 290 |
} else { ret = blk_status_to_errno(dio->bio.bi_status); |
542ff7bf1 block: new direct... |
291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 |
} dio->iocb->ki_complete(iocb, ret, 0); bio_put(&dio->bio); } else { struct task_struct *waiter = dio->waiter; WRITE_ONCE(dio->waiter, NULL); wake_up_process(waiter); } } if (should_dirty) { bio_check_pages_dirty(bio); } else { struct bio_vec *bvec; int i; bio_for_each_segment_all(bvec, bio, i) put_page(bvec->bv_page); bio_put(bio); } } |
b2e895dbd [PATCH] revert bl... |
314 |
static ssize_t |
542ff7bf1 block: new direct... |
315 |
__blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) |
b2e895dbd [PATCH] revert bl... |
316 317 |
{ struct file *file = iocb->ki_filp; |
4ebb16ca9 block: introduce ... |
318 |
struct inode *inode = bdev_file_inode(file); |
542ff7bf1 block: new direct... |
319 |
struct block_device *bdev = I_BDEV(inode); |
64d656a16 block: add back p... |
320 |
struct blk_plug plug; |
542ff7bf1 block: new direct... |
321 322 |
struct blkdev_dio *dio; struct bio *bio; |
690e5325b block: fix use af... |
323 |
bool is_read = (iov_iter_rw(iter) == READ), is_sync; |
542ff7bf1 block: new direct... |
324 325 |
loff_t pos = iocb->ki_pos; blk_qc_t qc = BLK_QC_T_NONE; |
36ffc6c1c block_dev: propag... |
326 |
int ret = 0; |
542ff7bf1 block: new direct... |
327 |
|
9a794fb9b block_dev: get ri... |
328 329 |
if ((pos | iov_iter_alignment(iter)) & (bdev_logical_block_size(bdev) - 1)) |
542ff7bf1 block: new direct... |
330 |
return -EINVAL; |
52190f8ab fs: convert block... |
331 |
bio = bio_alloc_bioset(GFP_KERNEL, nr_pages, &blkdev_dio_pool); |
542ff7bf1 block: new direct... |
332 333 334 |
bio_get(bio); /* extra ref for the completion handler */ dio = container_of(bio, struct blkdev_dio, bio); |
690e5325b block: fix use af... |
335 |
dio->is_sync = is_sync = is_sync_kiocb(iocb); |
542ff7bf1 block: new direct... |
336 337 338 339 340 341 342 343 |
if (dio->is_sync) dio->waiter = current; else dio->iocb = iocb; dio->size = 0; dio->multi_bio = false; dio->should_dirty = is_read && (iter->type == ITER_IOVEC); |
64d656a16 block: add back p... |
344 |
blk_start_plug(&plug); |
542ff7bf1 block: new direct... |
345 |
for (;;) { |
74d46992e block: replace bi... |
346 |
bio_set_dev(bio, bdev); |
4d1a47654 block_dev: Fixed ... |
347 |
bio->bi_iter.bi_sector = pos >> 9; |
45d06cf70 fs: add O_DIRECT ... |
348 |
bio->bi_write_hint = iocb->ki_hint; |
542ff7bf1 block: new direct... |
349 350 |
bio->bi_private = dio; bio->bi_end_io = blkdev_bio_end_io; |
074111ca5 fs: blkdev set bi... |
351 |
bio->bi_ioprio = iocb->ki_ioprio; |
542ff7bf1 block: new direct... |
352 353 354 |
ret = bio_iov_iter_get_pages(bio, iter); if (unlikely(ret)) { |
4e4cbee93 block: switch bio... |
355 |
bio->bi_status = BLK_STS_IOERR; |
542ff7bf1 block: new direct... |
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 |
bio_endio(bio); break; } if (is_read) { bio->bi_opf = REQ_OP_READ; if (dio->should_dirty) bio_set_pages_dirty(bio); } else { bio->bi_opf = dio_bio_write_op(iocb); task_io_account_write(bio->bi_iter.bi_size); } dio->size += bio->bi_iter.bi_size; pos += bio->bi_iter.bi_size; nr_pages = iov_iter_npages(iter, BIO_MAX_PAGES); if (!nr_pages) { qc = submit_bio(bio); break; } if (!dio->multi_bio) { dio->multi_bio = true; atomic_set(&dio->ref, 2); } else { atomic_inc(&dio->ref); } submit_bio(bio); bio = bio_alloc(GFP_KERNEL, nr_pages); } |
64d656a16 block: add back p... |
388 |
blk_finish_plug(&plug); |
542ff7bf1 block: new direct... |
389 |
|
690e5325b block: fix use af... |
390 |
if (!is_sync) |
542ff7bf1 block: new direct... |
391 392 393 394 395 396 397 398 |
return -EIOCBQUEUED; for (;;) { set_current_state(TASK_UNINTERRUPTIBLE); if (!READ_ONCE(dio->waiter)) break; if (!(iocb->ki_flags & IOCB_HIPRI) || |
ea435e1b9 block: add a poll... |
399 |
!blk_poll(bdev_get_queue(bdev), qc)) |
542ff7bf1 block: new direct... |
400 401 402 |
io_schedule(); } __set_current_state(TASK_RUNNING); |
36ffc6c1c block_dev: propag... |
403 |
if (!ret) |
4e4cbee93 block: switch bio... |
404 |
ret = blk_status_to_errno(dio->bio.bi_status); |
7a62a5233 block_dev: don't ... |
405 |
if (likely(!ret)) |
542ff7bf1 block: new direct... |
406 |
ret = dio->size; |
542ff7bf1 block: new direct... |
407 408 409 410 411 412 413 414 |
bio_put(&dio->bio); return ret; } static ssize_t blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter) { |
189ce2b9d block: fast-path ... |
415 |
int nr_pages; |
b2e895dbd [PATCH] revert bl... |
416 |
|
72ecad22d block: support a ... |
417 |
nr_pages = iov_iter_npages(iter, BIO_MAX_PAGES + 1); |
189ce2b9d block: fast-path ... |
418 419 |
if (!nr_pages) return 0; |
72ecad22d block: support a ... |
420 |
if (is_sync_kiocb(iocb) && nr_pages <= BIO_MAX_PAGES) |
189ce2b9d block: fast-path ... |
421 |
return __blkdev_direct_IO_simple(iocb, iter, nr_pages); |
542ff7bf1 block: new direct... |
422 423 424 425 426 427 |
return __blkdev_direct_IO(iocb, iter, min(nr_pages, BIO_MAX_PAGES)); } static __init int blkdev_init(void) { |
52190f8ab fs: convert block... |
428 |
return bioset_init(&blkdev_dio_pool, 4, offsetof(struct blkdev_dio, bio), BIOSET_NEED_BVECS); |
b2e895dbd [PATCH] revert bl... |
429 |
} |
542ff7bf1 block: new direct... |
430 |
module_init(blkdev_init); |
b2e895dbd [PATCH] revert bl... |
431 |
|
5cee5815d vfs: Make sys_syn... |
432 433 434 435 436 437 438 439 |
int __sync_blockdev(struct block_device *bdev, int wait) { if (!bdev) return 0; if (!wait) return filemap_flush(bdev->bd_inode->i_mapping); return filemap_write_and_wait(bdev->bd_inode->i_mapping); } |
585d3bc06 fs: move bdev cod... |
440 441 442 443 444 445 |
/* * Write out and wait upon all the dirty data associated with a block * device via its mapping. Does not take the superblock lock. */ int sync_blockdev(struct block_device *bdev) { |
5cee5815d vfs: Make sys_syn... |
446 |
return __sync_blockdev(bdev, 1); |
585d3bc06 fs: move bdev cod... |
447 448 449 450 451 452 453 454 455 456 457 458 |
} EXPORT_SYMBOL(sync_blockdev); /* * Write out and wait upon all dirty data associated with this * device. Filesystem data as well as the underlying block * device. Takes the superblock lock. */ int fsync_bdev(struct block_device *bdev) { struct super_block *sb = get_super(bdev); if (sb) { |
60b0680fa vfs: Rename fsync... |
459 |
int res = sync_filesystem(sb); |
585d3bc06 fs: move bdev cod... |
460 461 462 463 464 |
drop_super(sb); return res; } return sync_blockdev(bdev); } |
47e4491b4 Cleanup after com... |
465 |
EXPORT_SYMBOL(fsync_bdev); |
585d3bc06 fs: move bdev cod... |
466 467 468 469 470 |
/** * freeze_bdev -- lock a filesystem and force it into a consistent state * @bdev: blockdevice to lock * |
585d3bc06 fs: move bdev cod... |
471 472 473 474 475 476 477 478 479 480 481 482 483 484 |
* If a superblock is found on this device, we take the s_umount semaphore * on it to make sure nobody unmounts until the snapshot creation is done. * The reference counter (bd_fsfreeze_count) guarantees that only the last * unfreeze process can unfreeze the frozen filesystem actually when multiple * freeze requests arrive simultaneously. It counts up in freeze_bdev() and * count down in thaw_bdev(). When it becomes 0, thaw_bdev() will unfreeze * actually. */ struct super_block *freeze_bdev(struct block_device *bdev) { struct super_block *sb; int error = 0; mutex_lock(&bdev->bd_fsfreeze_mutex); |
4504230a7 freeze_bdev: grab... |
485 486 487 488 489 490 |
if (++bdev->bd_fsfreeze_count > 1) { /* * We don't even need to grab a reference - the first call * to freeze_bdev grab an active reference and only the last * thaw_bdev drops it. */ |
585d3bc06 fs: move bdev cod... |
491 |
sb = get_super(bdev); |
5bb53c0fb fs/block_dev: fix... |
492 493 |
if (sb) drop_super(sb); |
4504230a7 freeze_bdev: grab... |
494 495 496 497 498 499 500 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); return sb; } sb = get_active_super(bdev); if (!sb) goto out; |
48b6bca6b fs: add freeze_su... |
501 502 503 504 |
if (sb->s_op->freeze_super) error = sb->s_op->freeze_super(sb); else error = freeze_super(sb); |
18e9e5104 Introduce freeze_... |
505 506 507 |
if (error) { deactivate_super(sb); bdev->bd_fsfreeze_count--; |
585d3bc06 fs: move bdev cod... |
508 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); |
18e9e5104 Introduce freeze_... |
509 |
return ERR_PTR(error); |
585d3bc06 fs: move bdev cod... |
510 |
} |
18e9e5104 Introduce freeze_... |
511 |
deactivate_super(sb); |
4504230a7 freeze_bdev: grab... |
512 |
out: |
585d3bc06 fs: move bdev cod... |
513 514 |
sync_blockdev(bdev); mutex_unlock(&bdev->bd_fsfreeze_mutex); |
4fadd7bb2 freeze_bdev: kill... |
515 |
return sb; /* thaw_bdev releases s->s_umount */ |
585d3bc06 fs: move bdev cod... |
516 517 518 519 520 521 522 523 524 525 526 527 |
} EXPORT_SYMBOL(freeze_bdev); /** * thaw_bdev -- unlock filesystem * @bdev: blockdevice to unlock * @sb: associated superblock * * Unlocks the filesystem and marks it writeable again after freeze_bdev(). */ int thaw_bdev(struct block_device *bdev, struct super_block *sb) { |
4504230a7 freeze_bdev: grab... |
528 |
int error = -EINVAL; |
585d3bc06 fs: move bdev cod... |
529 530 |
mutex_lock(&bdev->bd_fsfreeze_mutex); |
4504230a7 freeze_bdev: grab... |
531 |
if (!bdev->bd_fsfreeze_count) |
18e9e5104 Introduce freeze_... |
532 |
goto out; |
4504230a7 freeze_bdev: grab... |
533 534 535 |
error = 0; if (--bdev->bd_fsfreeze_count > 0) |
18e9e5104 Introduce freeze_... |
536 |
goto out; |
4504230a7 freeze_bdev: grab... |
537 538 |
if (!sb) |
18e9e5104 Introduce freeze_... |
539 |
goto out; |
4504230a7 freeze_bdev: grab... |
540 |
|
48b6bca6b fs: add freeze_su... |
541 542 543 544 |
if (sb->s_op->thaw_super) error = sb->s_op->thaw_super(sb); else error = thaw_super(sb); |
997198ba1 fs/block_dev.c: r... |
545 |
if (error) |
18e9e5104 Introduce freeze_... |
546 |
bdev->bd_fsfreeze_count++; |
18e9e5104 Introduce freeze_... |
547 |
out: |
585d3bc06 fs: move bdev cod... |
548 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); |
997198ba1 fs/block_dev.c: r... |
549 |
return error; |
585d3bc06 fs: move bdev cod... |
550 551 |
} EXPORT_SYMBOL(thaw_bdev); |
1da177e4c Linux-2.6.12-rc2 |
552 553 554 555 556 557 558 559 560 |
static int blkdev_writepage(struct page *page, struct writeback_control *wbc) { return block_write_full_page(page, blkdev_get_block, wbc); } static int blkdev_readpage(struct file * file, struct page * page) { return block_read_full_page(page, blkdev_get_block); } |
447f05bb4 block_dev: implem... |
561 562 563 564 565 |
static int blkdev_readpages(struct file *file, struct address_space *mapping, struct list_head *pages, unsigned nr_pages) { return mpage_readpages(mapping, pages, nr_pages, blkdev_get_block); } |
6272b5a58 block_dev: conver... |
566 567 568 |
static int blkdev_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) |
1da177e4c Linux-2.6.12-rc2 |
569 |
{ |
155130a4f get rid of block_... |
570 571 |
return block_write_begin(mapping, pos, len, flags, pagep, blkdev_get_block); |
1da177e4c Linux-2.6.12-rc2 |
572 |
} |
6272b5a58 block_dev: conver... |
573 574 575 |
static int blkdev_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) |
1da177e4c Linux-2.6.12-rc2 |
576 |
{ |
6272b5a58 block_dev: conver... |
577 578 579 580 |
int ret; ret = block_write_end(file, mapping, pos, len, copied, page, fsdata); unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
581 |
put_page(page); |
6272b5a58 block_dev: conver... |
582 583 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
584 585 586 587 |
} /* * private llseek: |
496ad9aa8 new helper: file_... |
588 |
* for a block special file file_inode(file)->i_size is zero |
1da177e4c Linux-2.6.12-rc2 |
589 590 |
* so we compute the size by hand (just as in block_read/write above) */ |
965c8e59c lseek: the "whenc... |
591 |
static loff_t block_llseek(struct file *file, loff_t offset, int whence) |
1da177e4c Linux-2.6.12-rc2 |
592 |
{ |
4ebb16ca9 block: introduce ... |
593 |
struct inode *bd_inode = bdev_file_inode(file); |
1da177e4c Linux-2.6.12-rc2 |
594 |
loff_t retval; |
5955102c9 wrappers for ->i_... |
595 |
inode_lock(bd_inode); |
5d48f3a2d block_dev: switch... |
596 |
retval = fixed_size_llseek(file, offset, whence, i_size_read(bd_inode)); |
5955102c9 wrappers for ->i_... |
597 |
inode_unlock(bd_inode); |
1da177e4c Linux-2.6.12-rc2 |
598 599 600 |
return retval; } |
02c24a821 fs: push i_mutex ... |
601 |
int blkdev_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
1da177e4c Linux-2.6.12-rc2 |
602 |
{ |
4ebb16ca9 block: introduce ... |
603 |
struct inode *bd_inode = bdev_file_inode(filp); |
b8af67e26 fs/block_dev.c: f... |
604 |
struct block_device *bdev = I_BDEV(bd_inode); |
ab0a9735e blkdev: flush dis... |
605 |
int error; |
da5aa861b fix block device ... |
606 |
|
372cf243e block: convert to... |
607 |
error = file_write_and_wait_range(filp, start, end); |
da5aa861b fix block device ... |
608 609 |
if (error) return error; |
ab0a9735e blkdev: flush dis... |
610 |
|
b8af67e26 fs/block_dev.c: f... |
611 612 613 614 615 |
/* * There is no need to serialise calls to blkdev_issue_flush with * i_mutex and doing so causes performance issues with concurrent * O_SYNC writers to a block device. */ |
dd3932edd block: remove BLK... |
616 |
error = blkdev_issue_flush(bdev, GFP_KERNEL, NULL); |
ab0a9735e blkdev: flush dis... |
617 618 |
if (error == -EOPNOTSUPP) error = 0; |
b8af67e26 fs/block_dev.c: f... |
619 |
|
ab0a9735e blkdev: flush dis... |
620 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
621 |
} |
b1dd3b284 vfs: rename block... |
622 |
EXPORT_SYMBOL(blkdev_fsync); |
1da177e4c Linux-2.6.12-rc2 |
623 |
|
47a191fd3 fs/block_dev.c: a... |
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 |
/** * bdev_read_page() - Start reading a page from a block device * @bdev: The device to read the page from * @sector: The offset on the device to read the page to (need not be aligned) * @page: The page to read * * On entry, the page should be locked. It will be unlocked when the page * has been read. If the block driver implements rw_page synchronously, * that will be true on exit from this function, but it need not be. * * Errors returned by this function are usually "soft", eg out of memory, or * queue full; callers should try a different route to read this page rather * than propagate an error back up the stack. * * Return: negative errno if an error occurs, 0 if submission was successful. */ int bdev_read_page(struct block_device *bdev, sector_t sector, struct page *page) { const struct block_device_operations *ops = bdev->bd_disk->fops; |
2e6edc953 block: protect rw... |
644 |
int result = -EOPNOTSUPP; |
f68eb1e71 fs/block_dev.c: s... |
645 |
if (!ops->rw_page || bdev_get_integrity(bdev)) |
2e6edc953 block: protect rw... |
646 |
return result; |
3a0a52997 block, scsi: Make... |
647 |
result = blk_queue_enter(bdev->bd_queue, 0); |
2e6edc953 block: protect rw... |
648 649 |
if (result) return result; |
3f289dcb4 block: make bdev_... |
650 651 |
result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, REQ_OP_READ); |
2e6edc953 block: protect rw... |
652 653 |
blk_queue_exit(bdev->bd_queue); return result; |
47a191fd3 fs/block_dev.c: a... |
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 |
} EXPORT_SYMBOL_GPL(bdev_read_page); /** * bdev_write_page() - Start writing a page to a block device * @bdev: The device to write the page to * @sector: The offset on the device to write the page to (need not be aligned) * @page: The page to write * @wbc: The writeback_control for the write * * On entry, the page should be locked and not currently under writeback. * On exit, if the write started successfully, the page will be unlocked and * under writeback. If the write failed already (eg the driver failed to * queue the page to the device), the page will still be locked. If the * caller is a ->writepage implementation, it will need to unlock the page. * * Errors returned by this function are usually "soft", eg out of memory, or * queue full; callers should try a different route to write this page rather * than propagate an error back up the stack. * * Return: negative errno if an error occurs, 0 if submission was successful. */ int bdev_write_page(struct block_device *bdev, sector_t sector, struct page *page, struct writeback_control *wbc) { int result; |
47a191fd3 fs/block_dev.c: a... |
680 |
const struct block_device_operations *ops = bdev->bd_disk->fops; |
2e6edc953 block: protect rw... |
681 |
|
f68eb1e71 fs/block_dev.c: s... |
682 |
if (!ops->rw_page || bdev_get_integrity(bdev)) |
47a191fd3 fs/block_dev.c: a... |
683 |
return -EOPNOTSUPP; |
3a0a52997 block, scsi: Make... |
684 |
result = blk_queue_enter(bdev->bd_queue, 0); |
2e6edc953 block: protect rw... |
685 686 |
if (result) return result; |
47a191fd3 fs/block_dev.c: a... |
687 |
set_page_writeback(page); |
3f289dcb4 block: make bdev_... |
688 689 |
result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, REQ_OP_WRITE); |
f892760aa fs/mpage.c: fix m... |
690 |
if (result) { |
47a191fd3 fs/block_dev.c: a... |
691 |
end_page_writeback(page); |
f892760aa fs/mpage.c: fix m... |
692 693 |
} else { clean_page_buffers(page); |
47a191fd3 fs/block_dev.c: a... |
694 |
unlock_page(page); |
f892760aa fs/mpage.c: fix m... |
695 |
} |
2e6edc953 block: protect rw... |
696 |
blk_queue_exit(bdev->bd_queue); |
47a191fd3 fs/block_dev.c: a... |
697 698 699 |
return result; } EXPORT_SYMBOL_GPL(bdev_write_page); |
1da177e4c Linux-2.6.12-rc2 |
700 701 702 703 704 |
/* * pseudo-fs */ static __cacheline_aligned_in_smp DEFINE_SPINLOCK(bdev_lock); |
e18b890bb [PATCH] slab: rem... |
705 |
static struct kmem_cache * bdev_cachep __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
706 707 708 |
static struct inode *bdev_alloc_inode(struct super_block *sb) { |
e94b17660 [PATCH] slab: rem... |
709 |
struct bdev_inode *ei = kmem_cache_alloc(bdev_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
710 711 712 713 |
if (!ei) return NULL; return &ei->vfs_inode; } |
fa0d7e3de fs: icache RCU fr... |
714 |
static void bdev_i_callback(struct rcu_head *head) |
1da177e4c Linux-2.6.12-rc2 |
715 |
{ |
fa0d7e3de fs: icache RCU fr... |
716 |
struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4c Linux-2.6.12-rc2 |
717 |
struct bdev_inode *bdi = BDEV_I(inode); |
1da177e4c Linux-2.6.12-rc2 |
718 719 |
kmem_cache_free(bdev_cachep, bdi); } |
fa0d7e3de fs: icache RCU fr... |
720 721 722 723 |
static void bdev_destroy_inode(struct inode *inode) { call_rcu(&inode->i_rcu, bdev_i_callback); } |
51cc50685 SL*B: drop kmem c... |
724 |
static void init_once(void *foo) |
1da177e4c Linux-2.6.12-rc2 |
725 726 727 |
{ struct bdev_inode *ei = (struct bdev_inode *) foo; struct block_device *bdev = &ei->bdev; |
a35afb830 Remove SLAB_CTOR_... |
728 729 |
memset(bdev, 0, sizeof(*bdev)); mutex_init(&bdev->bd_mutex); |
a35afb830 Remove SLAB_CTOR_... |
730 |
INIT_LIST_HEAD(&bdev->bd_list); |
49731baa4 block: restore mu... |
731 732 733 |
#ifdef CONFIG_SYSFS INIT_LIST_HEAD(&bdev->bd_holder_disks); #endif |
a5a79d000 block: Initialize... |
734 |
bdev->bd_bdi = &noop_backing_dev_info; |
a35afb830 Remove SLAB_CTOR_... |
735 |
inode_init_once(&ei->vfs_inode); |
fcccf5025 filesystem freeze... |
736 737 |
/* Initialize mutex for freeze. */ mutex_init(&bdev->bd_fsfreeze_mutex); |
1da177e4c Linux-2.6.12-rc2 |
738 |
} |
b57922d97 convert remaining... |
739 |
static void bdev_evict_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
740 741 |
{ struct block_device *bdev = &BDEV_I(inode)->bdev; |
91b0abe36 mm + fs: store sh... |
742 |
truncate_inode_pages_final(&inode->i_data); |
b57922d97 convert remaining... |
743 |
invalidate_inode_buffers(inode); /* is it needed here? */ |
dbd5768f8 vfs: Rename end_w... |
744 |
clear_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
745 |
spin_lock(&bdev_lock); |
1da177e4c Linux-2.6.12-rc2 |
746 747 |
list_del_init(&bdev->bd_list); spin_unlock(&bdev_lock); |
f759741d9 block: Fix oops i... |
748 749 |
/* Detach inode from wb early as bdi_put() may free bdi->wb */ inode_detach_wb(inode); |
a5a79d000 block: Initialize... |
750 |
if (bdev->bd_bdi != &noop_backing_dev_info) { |
b1d2dc565 block: Make blk_g... |
751 |
bdi_put(bdev->bd_bdi); |
a5a79d000 block: Initialize... |
752 753 |
bdev->bd_bdi = &noop_backing_dev_info; } |
1da177e4c Linux-2.6.12-rc2 |
754 |
} |
ee9b6d61a [PATCH] Mark stru... |
755 |
static const struct super_operations bdev_sops = { |
1da177e4c Linux-2.6.12-rc2 |
756 757 758 759 |
.statfs = simple_statfs, .alloc_inode = bdev_alloc_inode, .destroy_inode = bdev_destroy_inode, .drop_inode = generic_delete_inode, |
b57922d97 convert remaining... |
760 |
.evict_inode = bdev_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
761 |
}; |
51139adac convert get_sb_ps... |
762 763 |
static struct dentry *bd_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
764 |
{ |
3684aa709 block-dev: enable... |
765 766 |
struct dentry *dent; dent = mount_pseudo(fs_type, "bdev:", &bdev_sops, NULL, BDEVFS_MAGIC); |
e9e5e3fae bdev: fix NULL po... |
767 |
if (!IS_ERR(dent)) |
3684aa709 block-dev: enable... |
768 769 |
dent->d_sb->s_iflags |= SB_I_CGROUPWB; return dent; |
1da177e4c Linux-2.6.12-rc2 |
770 771 772 773 |
} static struct file_system_type bd_type = { .name = "bdev", |
51139adac convert get_sb_ps... |
774 |
.mount = bd_mount, |
1da177e4c Linux-2.6.12-rc2 |
775 776 |
.kill_sb = kill_anon_super, }; |
a212b105b bdi: make inode_t... |
777 778 |
struct super_block *blockdev_superblock __read_mostly; EXPORT_SYMBOL_GPL(blockdev_superblock); |
1da177e4c Linux-2.6.12-rc2 |
779 780 781 782 |
void __init bdev_cache_init(void) { int err; |
ace8577ae block_dev: Suppre... |
783 |
static struct vfsmount *bd_mnt; |
c2acf7b90 fs/block_dev.c: _... |
784 |
|
1da177e4c Linux-2.6.12-rc2 |
785 |
bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode), |
fffb60f93 [PATCH] cpuset me... |
786 |
0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
5d097056c kmemcg: account c... |
787 |
SLAB_MEM_SPREAD|SLAB_ACCOUNT|SLAB_PANIC), |
20c2df83d mm: Remove slab d... |
788 |
init_once); |
1da177e4c Linux-2.6.12-rc2 |
789 790 791 792 |
err = register_filesystem(&bd_type); if (err) panic("Cannot register bdev pseudo-fs"); bd_mnt = kern_mount(&bd_type); |
1da177e4c Linux-2.6.12-rc2 |
793 794 |
if (IS_ERR(bd_mnt)) panic("Cannot create bdev pseudo-fs"); |
ace8577ae block_dev: Suppre... |
795 |
blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */ |
1da177e4c Linux-2.6.12-rc2 |
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 |
} /* * Most likely _very_ bad one - but then it's hardly critical for small * /dev and can be fixed when somebody will need really large one. * Keep in mind that it will be fed through icache hash function too. */ static inline unsigned long hash(dev_t dev) { return MAJOR(dev)+MINOR(dev); } static int bdev_test(struct inode *inode, void *data) { return BDEV_I(inode)->bdev.bd_dev == *(dev_t *)data; } static int bdev_set(struct inode *inode, void *data) { BDEV_I(inode)->bdev.bd_dev = *(dev_t *)data; return 0; } static LIST_HEAD(all_bdevs); |
f44f1ab5a block: Unhash blo... |
820 821 822 823 824 825 826 827 828 829 830 831 832 833 |
/* * If there is a bdev inode for this device, unhash it so that it gets evicted * as soon as last inode reference is dropped. */ void bdev_unhash_inode(dev_t dev) { struct inode *inode; inode = ilookup5(blockdev_superblock, hash(dev), bdev_test, &dev); if (inode) { remove_inode_hash(inode); iput(inode); } } |
1da177e4c Linux-2.6.12-rc2 |
834 835 836 837 |
struct block_device *bdget(dev_t dev) { struct block_device *bdev; struct inode *inode; |
c2acf7b90 fs/block_dev.c: _... |
838 |
inode = iget5_locked(blockdev_superblock, hash(dev), |
1da177e4c Linux-2.6.12-rc2 |
839 840 841 842 843 844 845 846 847 |
bdev_test, bdev_set, &dev); if (!inode) return NULL; bdev = &BDEV_I(inode)->bdev; if (inode->i_state & I_NEW) { bdev->bd_contains = NULL; |
782b94cdf block: initialise... |
848 |
bdev->bd_super = NULL; |
1da177e4c Linux-2.6.12-rc2 |
849 |
bdev->bd_inode = inode; |
93407472a fs: add i_blocksi... |
850 |
bdev->bd_block_size = i_blocksize(inode); |
1da177e4c Linux-2.6.12-rc2 |
851 852 853 854 855 856 857 |
bdev->bd_part_count = 0; bdev->bd_invalidated = 0; inode->i_mode = S_IFBLK; inode->i_rdev = dev; inode->i_bdev = bdev; inode->i_data.a_ops = &def_blk_aops; mapping_set_gfp_mask(&inode->i_data, GFP_USER); |
1da177e4c Linux-2.6.12-rc2 |
858 859 860 861 862 863 864 865 866 |
spin_lock(&bdev_lock); list_add(&bdev->bd_list, &all_bdevs); spin_unlock(&bdev_lock); unlock_new_inode(inode); } return bdev; } EXPORT_SYMBOL(bdget); |
dddac6a7b PM / Hibernate: R... |
867 868 869 870 871 872 |
/** * bdgrab -- Grab a reference to an already referenced block device * @bdev: Block device to grab a reference to. */ struct block_device *bdgrab(struct block_device *bdev) { |
7de9c6ee3 new helper: ihold() |
873 |
ihold(bdev->bd_inode); |
dddac6a7b PM / Hibernate: R... |
874 875 |
return bdev; } |
c1681bf8a loop: prevent bde... |
876 |
EXPORT_SYMBOL(bdgrab); |
dddac6a7b PM / Hibernate: R... |
877 |
|
1da177e4c Linux-2.6.12-rc2 |
878 879 |
long nr_blockdev_pages(void) { |
203a2935c fs/block_dev.c: u... |
880 |
struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
881 882 |
long ret = 0; spin_lock(&bdev_lock); |
203a2935c fs/block_dev.c: u... |
883 |
list_for_each_entry(bdev, &all_bdevs, bd_list) { |
1da177e4c Linux-2.6.12-rc2 |
884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 |
ret += bdev->bd_inode->i_mapping->nrpages; } spin_unlock(&bdev_lock); return ret; } void bdput(struct block_device *bdev) { iput(bdev->bd_inode); } EXPORT_SYMBOL(bdput); static struct block_device *bd_acquire(struct inode *inode) { struct block_device *bdev; |
09d967c6f [PATCH] Fix a rac... |
900 |
|
1da177e4c Linux-2.6.12-rc2 |
901 902 |
spin_lock(&bdev_lock); bdev = inode->i_bdev; |
cccd9fb9e block: Revalidate... |
903 |
if (bdev && !inode_unhashed(bdev->bd_inode)) { |
ed8a9d2c8 block: use bd{gra... |
904 |
bdgrab(bdev); |
1da177e4c Linux-2.6.12-rc2 |
905 906 907 908 |
spin_unlock(&bdev_lock); return bdev; } spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
909 |
|
cccd9fb9e block: Revalidate... |
910 911 912 913 914 915 916 917 |
/* * i_bdev references block device inode that was already shut down * (corresponding device got removed). Remove the reference and look * up block device inode again just in case new device got * reestablished under the same device number. */ if (bdev) bd_forget(inode); |
1da177e4c Linux-2.6.12-rc2 |
918 919 920 |
bdev = bdget(inode->i_rdev); if (bdev) { spin_lock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
921 922 |
if (!inode->i_bdev) { /* |
7de9c6ee3 new helper: ihold() |
923 |
* We take an additional reference to bd_inode, |
09d967c6f [PATCH] Fix a rac... |
924 925 926 927 |
* and it's released in clear_inode() of inode. * So, we can access it via ->i_mapping always * without igrab(). */ |
ed8a9d2c8 block: use bd{gra... |
928 |
bdgrab(bdev); |
09d967c6f [PATCH] Fix a rac... |
929 930 |
inode->i_bdev = bdev; inode->i_mapping = bdev->bd_inode->i_mapping; |
09d967c6f [PATCH] Fix a rac... |
931 |
} |
1da177e4c Linux-2.6.12-rc2 |
932 933 934 935 936 937 938 939 940 |
spin_unlock(&bdev_lock); } return bdev; } /* Call when you free inode */ void bd_forget(struct inode *inode) { |
09d967c6f [PATCH] Fix a rac... |
941 |
struct block_device *bdev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
942 |
spin_lock(&bdev_lock); |
b4ea2eaa1 fs/block_dev.c: n... |
943 944 |
if (!sb_is_blkdev_sb(inode->i_sb)) bdev = inode->i_bdev; |
a4a4f9439 bdev: get rid of ... |
945 946 |
inode->i_bdev = NULL; inode->i_mapping = &inode->i_data; |
1da177e4c Linux-2.6.12-rc2 |
947 |
spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
948 949 |
if (bdev) |
ed8a9d2c8 block: use bd{gra... |
950 |
bdput(bdev); |
1da177e4c Linux-2.6.12-rc2 |
951 |
} |
1a3cbbc5a block: factor out... |
952 953 954 955 956 957 |
/** * bd_may_claim - test whether a block device can be claimed * @bdev: block device of interest * @whole: whole block device containing @bdev, may equal @bdev * @holder: holder trying to claim @bdev * |
25985edce Fix common misspe... |
958 |
* Test whether @bdev can be claimed by @holder. |
1a3cbbc5a block: factor out... |
959 960 961 962 963 964 965 966 967 |
* * CONTEXT: * spin_lock(&bdev_lock). * * RETURNS: * %true if @bdev can be claimed, %false otherwise. */ static bool bd_may_claim(struct block_device *bdev, struct block_device *whole, void *holder) |
1da177e4c Linux-2.6.12-rc2 |
968 |
{ |
1da177e4c Linux-2.6.12-rc2 |
969 |
if (bdev->bd_holder == holder) |
1a3cbbc5a block: factor out... |
970 |
return true; /* already a holder */ |
1da177e4c Linux-2.6.12-rc2 |
971 |
else if (bdev->bd_holder != NULL) |
1a3cbbc5a block: factor out... |
972 |
return false; /* held by someone else */ |
bcc7f5b4b block_dev: don't ... |
973 |
else if (whole == bdev) |
1a3cbbc5a block: factor out... |
974 |
return true; /* is a whole device which isn't held */ |
1da177e4c Linux-2.6.12-rc2 |
975 |
|
e525fd89d block: make blkde... |
976 |
else if (whole->bd_holder == bd_may_claim) |
1a3cbbc5a block: factor out... |
977 978 979 |
return true; /* is a partition of a device that is being partitioned */ else if (whole->bd_holder != NULL) return false; /* is a partition of a held device */ |
1da177e4c Linux-2.6.12-rc2 |
980 |
else |
1a3cbbc5a block: factor out... |
981 982 983 984 |
return true; /* is a partition of an un-held device */ } /** |
6b4517a79 block: implement ... |
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 |
* bd_prepare_to_claim - prepare to claim a block device * @bdev: block device of interest * @whole: the whole device containing @bdev, may equal @bdev * @holder: holder trying to claim @bdev * * Prepare to claim @bdev. This function fails if @bdev is already * claimed by another holder and waits if another claiming is in * progress. This function doesn't actually claim. On successful * return, the caller has ownership of bd_claiming and bd_holder[s]. * * CONTEXT: * spin_lock(&bdev_lock). Might release bdev_lock, sleep and regrab * it multiple times. * * RETURNS: * 0 if @bdev can be claimed, -EBUSY otherwise. */ static int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole, void *holder) { retry: /* if someone else claimed, fail */ if (!bd_may_claim(bdev, whole, holder)) return -EBUSY; |
e75aa8589 block_dev: always... |
1009 1010 |
/* if claiming is already in progress, wait for it to finish */ if (whole->bd_claiming) { |
6b4517a79 block: implement ... |
1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 |
wait_queue_head_t *wq = bit_waitqueue(&whole->bd_claiming, 0); DEFINE_WAIT(wait); prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE); spin_unlock(&bdev_lock); schedule(); finish_wait(wq, &wait); spin_lock(&bdev_lock); goto retry; } /* yay, all mine */ return 0; } |
560e7cb2f blockdev: Avoid t... |
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 |
static struct gendisk *bdev_get_gendisk(struct block_device *bdev, int *partno) { struct gendisk *disk = get_gendisk(bdev->bd_dev, partno); if (!disk) return NULL; /* * Now that we hold gendisk reference we make sure bdev we looked up is * not stale. If it is, it means device got removed and created before * we looked up gendisk and we fail open in such case. Associating * unhashed bdev with newly created gendisk could lead to two bdevs * (and thus two independent caches) being associated with one device * which is bad. */ if (inode_unhashed(bdev->bd_inode)) { put_disk_and_module(disk); return NULL; } return disk; } |
6b4517a79 block: implement ... |
1045 1046 1047 1048 1049 1050 1051 1052 |
/** * bd_start_claiming - start claiming a block device * @bdev: block device of interest * @holder: holder trying to claim @bdev * * @bdev is about to be opened exclusively. Check @bdev can be opened * exclusively and mark that an exclusive open is in progress. Each * successful call to this function must be matched with a call to |
b0018361c block: bd_start_c... |
1053 1054 1055 1056 1057 1058 1059 |
* either bd_finish_claiming() or bd_abort_claiming() (which do not * fail). * * This function is used to gain exclusive access to the block device * without actually causing other exclusive open attempts to fail. It * should be used when the open sequence itself requires exclusive * access but may subsequently fail. |
6b4517a79 block: implement ... |
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 |
* * CONTEXT: * Might sleep. * * RETURNS: * Pointer to the block device containing @bdev on success, ERR_PTR() * value on failure. */ static struct block_device *bd_start_claiming(struct block_device *bdev, void *holder) { struct gendisk *disk; struct block_device *whole; int partno, err; might_sleep(); /* * @bdev might not have been initialized properly yet, look up * and grab the outer block device the hard way. */ |
560e7cb2f blockdev: Avoid t... |
1081 |
disk = bdev_get_gendisk(bdev, &partno); |
6b4517a79 block: implement ... |
1082 1083 |
if (!disk) return ERR_PTR(-ENXIO); |
d4c208b86 block: use the pa... |
1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 |
/* * Normally, @bdev should equal what's returned from bdget_disk() * if partno is 0; however, some drivers (floppy) use multiple * bdev's for the same physical device and @bdev may be one of the * aliases. Keep @bdev if partno is 0. This means claimer * tracking is broken for those devices but it has always been that * way. */ if (partno) whole = bdget_disk(disk, 0); else whole = bdgrab(bdev); |
9df6c2991 genhd: Add helper... |
1096 |
put_disk_and_module(disk); |
6b4517a79 block: implement ... |
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 |
if (!whole) return ERR_PTR(-ENOMEM); /* prepare to claim, if successful, mark claiming in progress */ spin_lock(&bdev_lock); err = bd_prepare_to_claim(bdev, whole, holder); if (err == 0) { whole->bd_claiming = holder; spin_unlock(&bdev_lock); return whole; } else { spin_unlock(&bdev_lock); bdput(whole); return ERR_PTR(err); } } |
641dc636b [PATCH] dm/md dep... |
1114 |
#ifdef CONFIG_SYSFS |
49731baa4 block: restore mu... |
1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 |
struct bd_holder_disk { struct list_head list; struct gendisk *disk; int refcnt; }; static struct bd_holder_disk *bd_find_holder_disk(struct block_device *bdev, struct gendisk *disk) { struct bd_holder_disk *holder; list_for_each_entry(holder, &bdev->bd_holder_disks, list) if (holder->disk == disk) return holder; return NULL; } |
4d7dd8fd9 [PATCH] blockdev.... |
1131 |
static int add_symlink(struct kobject *from, struct kobject *to) |
641dc636b [PATCH] dm/md dep... |
1132 |
{ |
4d7dd8fd9 [PATCH] blockdev.... |
1133 |
return sysfs_create_link(from, to, kobject_name(to)); |
641dc636b [PATCH] dm/md dep... |
1134 1135 1136 1137 |
} static void del_symlink(struct kobject *from, struct kobject *to) { |
641dc636b [PATCH] dm/md dep... |
1138 1139 |
sysfs_remove_link(from, kobject_name(to)); } |
641dc636b [PATCH] dm/md dep... |
1140 |
/** |
e09b457bd block: simplify h... |
1141 1142 1143 |
* bd_link_disk_holder - create symlinks between holding disk and slave bdev * @bdev: the claimed slave bdev * @disk: the holding disk |
df6c0cd9a [PATCH] clean up ... |
1144 |
* |
49731baa4 block: restore mu... |
1145 1146 |
* DON'T USE THIS UNLESS YOU'RE ALREADY USING IT. * |
e09b457bd block: simplify h... |
1147 |
* This functions creates the following sysfs symlinks. |
641dc636b [PATCH] dm/md dep... |
1148 |
* |
e09b457bd block: simplify h... |
1149 1150 |
* - from "slaves" directory of the holder @disk to the claimed @bdev * - from "holders" directory of the @bdev to the holder @disk |
641dc636b [PATCH] dm/md dep... |
1151 |
* |
e09b457bd block: simplify h... |
1152 1153 |
* For example, if /dev/dm-0 maps to /dev/sda and disk for dm-0 is * passed to bd_link_disk_holder(), then: |
641dc636b [PATCH] dm/md dep... |
1154 |
* |
e09b457bd block: simplify h... |
1155 1156 |
* /sys/block/dm-0/slaves/sda --> /sys/block/sda * /sys/block/sda/holders/dm-0 --> /sys/block/dm-0 |
641dc636b [PATCH] dm/md dep... |
1157 |
* |
e09b457bd block: simplify h... |
1158 1159 1160 |
* The caller must have claimed @bdev before calling this function and * ensure that both @bdev and @disk are valid during the creation and * lifetime of these symlinks. |
641dc636b [PATCH] dm/md dep... |
1161 |
* |
e09b457bd block: simplify h... |
1162 1163 |
* CONTEXT: * Might sleep. |
641dc636b [PATCH] dm/md dep... |
1164 |
* |
e09b457bd block: simplify h... |
1165 1166 |
* RETURNS: * 0 on success, -errno on failure. |
641dc636b [PATCH] dm/md dep... |
1167 |
*/ |
e09b457bd block: simplify h... |
1168 |
int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) |
641dc636b [PATCH] dm/md dep... |
1169 |
{ |
49731baa4 block: restore mu... |
1170 |
struct bd_holder_disk *holder; |
e09b457bd block: simplify h... |
1171 |
int ret = 0; |
641dc636b [PATCH] dm/md dep... |
1172 |
|
2e7b651df [PATCH] remove th... |
1173 |
mutex_lock(&bdev->bd_mutex); |
df6c0cd9a [PATCH] clean up ... |
1174 |
|
49731baa4 block: restore mu... |
1175 |
WARN_ON_ONCE(!bdev->bd_holder); |
4e91672c7 Replace obscure c... |
1176 |
|
e09b457bd block: simplify h... |
1177 1178 1179 |
/* FIXME: remove the following once add_disk() handles errors */ if (WARN_ON(!disk->slave_dir || !bdev->bd_part->holder_dir)) goto out_unlock; |
4e91672c7 Replace obscure c... |
1180 |
|
49731baa4 block: restore mu... |
1181 1182 1183 |
holder = bd_find_holder_disk(bdev, disk); if (holder) { holder->refcnt++; |
e09b457bd block: simplify h... |
1184 |
goto out_unlock; |
49731baa4 block: restore mu... |
1185 |
} |
641dc636b [PATCH] dm/md dep... |
1186 |
|
49731baa4 block: restore mu... |
1187 1188 1189 |
holder = kzalloc(sizeof(*holder), GFP_KERNEL); if (!holder) { ret = -ENOMEM; |
e09b457bd block: simplify h... |
1190 1191 |
goto out_unlock; } |
641dc636b [PATCH] dm/md dep... |
1192 |
|
49731baa4 block: restore mu... |
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 |
INIT_LIST_HEAD(&holder->list); holder->disk = disk; holder->refcnt = 1; ret = add_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj); if (ret) goto out_free; ret = add_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj); if (ret) goto out_del; |
e7407d161 block: bd_link_di... |
1204 1205 1206 1207 1208 |
/* * bdev could be deleted beneath us which would implicitly destroy * the holder directory. Hold on to it. */ kobject_get(bdev->bd_part->holder_dir); |
49731baa4 block: restore mu... |
1209 1210 1211 1212 1213 1214 1215 1216 |
list_add(&holder->list, &bdev->bd_holder_disks); goto out_unlock; out_del: del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj); out_free: kfree(holder); |
e09b457bd block: simplify h... |
1217 |
out_unlock: |
b4cf1b72e [PATCH] dm/md dep... |
1218 |
mutex_unlock(&bdev->bd_mutex); |
e09b457bd block: simplify h... |
1219 |
return ret; |
641dc636b [PATCH] dm/md dep... |
1220 |
} |
e09b457bd block: simplify h... |
1221 |
EXPORT_SYMBOL_GPL(bd_link_disk_holder); |
641dc636b [PATCH] dm/md dep... |
1222 |
|
49731baa4 block: restore mu... |
1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 |
/** * bd_unlink_disk_holder - destroy symlinks created by bd_link_disk_holder() * @bdev: the calimed slave bdev * @disk: the holding disk * * DON'T USE THIS UNLESS YOU'RE ALREADY USING IT. * * CONTEXT: * Might sleep. */ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) |
641dc636b [PATCH] dm/md dep... |
1234 |
{ |
49731baa4 block: restore mu... |
1235 |
struct bd_holder_disk *holder; |
641dc636b [PATCH] dm/md dep... |
1236 |
|
49731baa4 block: restore mu... |
1237 |
mutex_lock(&bdev->bd_mutex); |
641dc636b [PATCH] dm/md dep... |
1238 |
|
49731baa4 block: restore mu... |
1239 1240 1241 1242 1243 1244 |
holder = bd_find_holder_disk(bdev, disk); if (!WARN_ON_ONCE(holder == NULL) && !--holder->refcnt) { del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj); del_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj); |
e7407d161 block: bd_link_di... |
1245 |
kobject_put(bdev->bd_part->holder_dir); |
49731baa4 block: restore mu... |
1246 1247 1248 1249 1250 |
list_del_init(&holder->list); kfree(holder); } mutex_unlock(&bdev->bd_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1251 |
} |
49731baa4 block: restore mu... |
1252 |
EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); |
641dc636b [PATCH] dm/md dep... |
1253 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1254 |
|
0c002c2f7 Wrapper for lower... |
1255 |
/** |
56ade44b4 Added flush_disk ... |
1256 1257 1258 |
* flush_disk - invalidates all buffer-cache entries on a disk * * @bdev: struct block device to be flushed |
e6eb5ce1b fs/block_dev.c: f... |
1259 |
* @kill_dirty: flag to guide handling of dirty inodes |
56ade44b4 Added flush_disk ... |
1260 1261 1262 1263 1264 |
* * Invalidates all buffer-cache entries on a disk. It should be called * when a disk has been changed -- either by a media change or online * resize. */ |
93b270f76 Fix over-zealous ... |
1265 |
static void flush_disk(struct block_device *bdev, bool kill_dirty) |
56ade44b4 Added flush_disk ... |
1266 |
{ |
93b270f76 Fix over-zealous ... |
1267 |
if (__invalidate_device(bdev, kill_dirty)) { |
56ade44b4 Added flush_disk ... |
1268 |
printk(KERN_WARNING "VFS: busy inodes on changed media or " |
424081f3c fs: use gendisk->... |
1269 1270 1271 |
"resized disk %s ", bdev->bd_disk ? bdev->bd_disk->disk_name : ""); |
56ade44b4 Added flush_disk ... |
1272 1273 1274 1275 |
} if (!bdev->bd_disk) return; |
d27769ec3 block: add GENHD_... |
1276 |
if (disk_part_scan_enabled(bdev->bd_disk)) |
56ade44b4 Added flush_disk ... |
1277 1278 1279 1280 |
bdev->bd_invalidated = 1; } /** |
57d1b5366 block_dev: fix ke... |
1281 |
* check_disk_size_change - checks for disk size change and adjusts bdev size. |
c3279d145 Adjust block devi... |
1282 1283 |
* @disk: struct gendisk to check * @bdev: struct bdev to adjust. |
5afb78356 block: don't prin... |
1284 |
* @verbose: if %true log a message about a size change if there is any |
c3279d145 Adjust block devi... |
1285 1286 |
* * This routine checks to see if the bdev size does not match the disk size |
849cf5596 fs: don't flush p... |
1287 1288 |
* and adjusts it if it differs. When shrinking the bdev size, its all caches * are freed. |
c3279d145 Adjust block devi... |
1289 |
*/ |
5afb78356 block: don't prin... |
1290 1291 |
void check_disk_size_change(struct gendisk *disk, struct block_device *bdev, bool verbose) |
c3279d145 Adjust block devi... |
1292 1293 1294 1295 1296 1297 |
{ loff_t disk_size, bdev_size; disk_size = (loff_t)get_capacity(disk) << 9; bdev_size = i_size_read(bdev->bd_inode); if (disk_size != bdev_size) { |
5afb78356 block: don't prin... |
1298 1299 1300 1301 1302 1303 |
if (verbose) { printk(KERN_INFO "%s: detected capacity change from %lld to %lld ", disk->disk_name, bdev_size, disk_size); } |
c3279d145 Adjust block devi... |
1304 |
i_size_write(bdev->bd_inode, disk_size); |
849cf5596 fs: don't flush p... |
1305 1306 |
if (bdev_size > disk_size) flush_disk(bdev, false); |
c3279d145 Adjust block devi... |
1307 1308 |
} } |
c3279d145 Adjust block devi... |
1309 1310 |
/** |
57d1b5366 block_dev: fix ke... |
1311 |
* revalidate_disk - wrapper for lower-level driver's revalidate_disk call-back |
0c002c2f7 Wrapper for lower... |
1312 1313 1314 1315 1316 1317 1318 1319 |
* @disk: struct gendisk to be revalidated * * This routine is a wrapper for lower-level driver's revalidate_disk * call-backs. It is used to do common pre and post operations needed * for all revalidate_disk operations. */ int revalidate_disk(struct gendisk *disk) { |
c3279d145 Adjust block devi... |
1320 |
struct block_device *bdev; |
0c002c2f7 Wrapper for lower... |
1321 1322 1323 1324 |
int ret = 0; if (disk->fops->revalidate_disk) ret = disk->fops->revalidate_disk(disk); |
c3279d145 Adjust block devi... |
1325 1326 1327 1328 1329 |
bdev = bdget_disk(disk, 0); if (!bdev) return ret; mutex_lock(&bdev->bd_mutex); |
5afb78356 block: don't prin... |
1330 |
check_disk_size_change(disk, bdev, ret == 0); |
7630b661d fs/block_dev.c: p... |
1331 |
bdev->bd_invalidated = 0; |
c3279d145 Adjust block devi... |
1332 1333 |
mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
0c002c2f7 Wrapper for lower... |
1334 1335 1336 |
return ret; } EXPORT_SYMBOL(revalidate_disk); |
1da177e4c Linux-2.6.12-rc2 |
1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 |
/* * This routine checks whether a removable media has been changed, * and invalidates all buffer-cache-entries in that case. This * is a relatively slow routine, so we have to try to minimize using * it. Thus it is called only upon a 'mount' or 'open'. This * is the best way of combining speed and utility, I think. * People changing diskettes in the middle of an operation deserve * to lose :-) */ int check_disk_change(struct block_device *bdev) { struct gendisk *disk = bdev->bd_disk; |
83d5cde47 const: make block... |
1349 |
const struct block_device_operations *bdops = disk->fops; |
77ea887e4 implement in-kern... |
1350 |
unsigned int events; |
1da177e4c Linux-2.6.12-rc2 |
1351 |
|
77ea887e4 implement in-kern... |
1352 1353 1354 |
events = disk_clear_events(disk, DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST); if (!(events & DISK_EVENT_MEDIA_CHANGE)) |
1da177e4c Linux-2.6.12-rc2 |
1355 |
return 0; |
93b270f76 Fix over-zealous ... |
1356 |
flush_disk(bdev, true); |
1da177e4c Linux-2.6.12-rc2 |
1357 1358 |
if (bdops->revalidate_disk) bdops->revalidate_disk(bdev->bd_disk); |
1da177e4c Linux-2.6.12-rc2 |
1359 1360 1361 1362 1363 1364 1365 |
return 1; } EXPORT_SYMBOL(check_disk_change); void bd_set_size(struct block_device *bdev, loff_t size) { |
5955102c9 wrappers for ->i_... |
1366 |
inode_lock(bdev->bd_inode); |
d646a02a9 block: use i_size... |
1367 |
i_size_write(bdev->bd_inode, size); |
5955102c9 wrappers for ->i_... |
1368 |
inode_unlock(bdev->bd_inode); |
1da177e4c Linux-2.6.12-rc2 |
1369 1370 |
} EXPORT_SYMBOL(bd_set_size); |
4385bab12 make blkdev_put()... |
1371 |
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part); |
37be41241 [PATCH] lockdep: ... |
1372 |
|
6d740cd5b [PATCH] lockdep: ... |
1373 1374 1375 1376 1377 1378 |
/* * bd_mutex locking: * * mutex_lock(part->bd_mutex) * mutex_lock_nested(whole->bd_mutex, 1) */ |
572c48921 [PATCH] sanitize ... |
1379 |
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) |
1da177e4c Linux-2.6.12-rc2 |
1380 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1381 |
struct gendisk *disk; |
7db9cfd38 devscgroup: check... |
1382 |
int ret; |
cf771cb5a block: make varia... |
1383 |
int partno; |
fe6e9c1f2 [PATCH] fix cgrou... |
1384 |
int perm = 0; |
897366537 genhd: Fix use af... |
1385 |
bool first_open = false; |
fe6e9c1f2 [PATCH] fix cgrou... |
1386 |
|
572c48921 [PATCH] sanitize ... |
1387 |
if (mode & FMODE_READ) |
fe6e9c1f2 [PATCH] fix cgrou... |
1388 |
perm |= MAY_READ; |
572c48921 [PATCH] sanitize ... |
1389 |
if (mode & FMODE_WRITE) |
fe6e9c1f2 [PATCH] fix cgrou... |
1390 1391 1392 1393 |
perm |= MAY_WRITE; /* * hooks: /n/, see "layering violations". */ |
b7300b78d blkdev: cgroup wh... |
1394 1395 1396 1397 1398 1399 |
if (!for_part) { ret = devcgroup_inode_permission(bdev->bd_inode, perm); if (ret != 0) { bdput(bdev); return ret; } |
826660203 [PATCH] fix bdev ... |
1400 |
} |
7db9cfd38 devscgroup: check... |
1401 |
|
d3374825c md: make devices ... |
1402 |
restart: |
0762b8bde block: always set... |
1403 |
|
89f97496e block: fix __blkd... |
1404 |
ret = -ENXIO; |
560e7cb2f blockdev: Avoid t... |
1405 |
disk = bdev_get_gendisk(bdev, &partno); |
0762b8bde block: always set... |
1406 |
if (!disk) |
6e9624b8c block: push down ... |
1407 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1408 |
|
69e02c59a block: Don't chec... |
1409 |
disk_block_events(disk); |
6796bf54a [PATCH] lockdep: ... |
1410 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
1da177e4c Linux-2.6.12-rc2 |
1411 |
if (!bdev->bd_openers) { |
897366537 genhd: Fix use af... |
1412 |
first_open = true; |
1da177e4c Linux-2.6.12-rc2 |
1413 |
bdev->bd_disk = disk; |
87192a2a4 vfs: cache reques... |
1414 |
bdev->bd_queue = disk->queue; |
1da177e4c Linux-2.6.12-rc2 |
1415 |
bdev->bd_contains = bdev; |
c2ee070fb block: cache the ... |
1416 |
bdev->bd_partno = partno; |
03cdadb04 block: disable bl... |
1417 |
|
cf771cb5a block: make varia... |
1418 |
if (!partno) { |
89f97496e block: fix __blkd... |
1419 1420 1421 1422 |
ret = -ENXIO; bdev->bd_part = disk_get_part(disk, partno); if (!bdev->bd_part) goto out_clear; |
1196f8b81 block: rescan par... |
1423 |
ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1424 |
if (disk->fops->open) { |
572c48921 [PATCH] sanitize ... |
1425 |
ret = disk->fops->open(bdev, mode); |
d3374825c md: make devices ... |
1426 1427 1428 1429 1430 1431 1432 |
if (ret == -ERESTARTSYS) { /* Lost a race with 'disk' being * deleted, try again. * See md.c */ disk_put_part(bdev->bd_part); bdev->bd_part = NULL; |
d3374825c md: make devices ... |
1433 |
bdev->bd_disk = NULL; |
87192a2a4 vfs: cache reques... |
1434 |
bdev->bd_queue = NULL; |
d3374825c md: make devices ... |
1435 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1436 |
disk_unblock_events(disk); |
9df6c2991 genhd: Add helper... |
1437 |
put_disk_and_module(disk); |
d3374825c md: make devices ... |
1438 1439 |
goto restart; } |
1da177e4c Linux-2.6.12-rc2 |
1440 |
} |
7e69723fe block: move bd_se... |
1441 |
|
1e11b1d63 blockdev: Fix liv... |
1442 |
if (!ret) { |
7e69723fe block: move bd_se... |
1443 |
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9); |
1e11b1d63 blockdev: Fix liv... |
1444 1445 |
set_init_blocksize(bdev); } |
7e69723fe block: move bd_se... |
1446 |
|
1196f8b81 block: rescan par... |
1447 1448 1449 1450 1451 1452 |
/* * If the device is invalidated, rescan partition * if open succeeded or failed with -ENOMEDIUM. * The latter is necessary to prevent ghost * partitions on a removed medium. */ |
fe316bf2d block: Fix NULL p... |
1453 1454 1455 1456 1457 1458 |
if (bdev->bd_invalidated) { if (!ret) rescan_partitions(disk, bdev); else if (ret == -ENOMEDIUM) invalidate_partitions(disk, bdev); } |
5a023cdba block: enable dax... |
1459 |
|
1196f8b81 block: rescan par... |
1460 1461 |
if (ret) goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1462 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1463 1464 1465 1466 |
struct block_device *whole; whole = bdget_disk(disk, 0); ret = -ENOMEM; if (!whole) |
0762b8bde block: always set... |
1467 |
goto out_clear; |
37be41241 [PATCH] lockdep: ... |
1468 |
BUG_ON(for_part); |
572c48921 [PATCH] sanitize ... |
1469 |
ret = __blkdev_get(whole, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1470 |
if (ret) |
0762b8bde block: always set... |
1471 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1472 |
bdev->bd_contains = whole; |
89f97496e block: fix __blkd... |
1473 |
bdev->bd_part = disk_get_part(disk, partno); |
e71bf0d0e block: fix disk->... |
1474 |
if (!(disk->flags & GENHD_FL_UP) || |
89f97496e block: fix __blkd... |
1475 |
!bdev->bd_part || !bdev->bd_part->nr_sects) { |
1da177e4c Linux-2.6.12-rc2 |
1476 |
ret = -ENXIO; |
0762b8bde block: always set... |
1477 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1478 |
} |
89f97496e block: fix __blkd... |
1479 |
bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9); |
1e11b1d63 blockdev: Fix liv... |
1480 |
set_init_blocksize(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1481 |
} |
03e262798 block: Fix bdi as... |
1482 1483 1484 |
if (bdev->bd_bdi == &noop_backing_dev_info) bdev->bd_bdi = bdi_get(disk->queue->backing_dev_info); |
1da177e4c Linux-2.6.12-rc2 |
1485 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1486 |
if (bdev->bd_contains == bdev) { |
1196f8b81 block: rescan par... |
1487 1488 |
ret = 0; if (bdev->bd_disk->fops->open) |
572c48921 [PATCH] sanitize ... |
1489 |
ret = bdev->bd_disk->fops->open(bdev, mode); |
1196f8b81 block: rescan par... |
1490 |
/* the same as first opener case, read comment there */ |
fe316bf2d block: Fix NULL p... |
1491 1492 1493 1494 1495 1496 |
if (bdev->bd_invalidated) { if (!ret) rescan_partitions(bdev->bd_disk, bdev); else if (ret == -ENOMEDIUM) invalidate_partitions(bdev->bd_disk, bdev); } |
1196f8b81 block: rescan par... |
1497 1498 |
if (ret) goto out_unlock_bdev; |
1da177e4c Linux-2.6.12-rc2 |
1499 1500 1501 |
} } bdev->bd_openers++; |
37be41241 [PATCH] lockdep: ... |
1502 1503 |
if (for_part) bdev->bd_part_count++; |
c039e3134 [PATCH] sem2mutex... |
1504 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1505 |
disk_unblock_events(disk); |
897366537 genhd: Fix use af... |
1506 1507 1508 |
/* only one opener holds refs to the module and disk */ if (!first_open) put_disk_and_module(disk); |
1da177e4c Linux-2.6.12-rc2 |
1509 |
return 0; |
0762b8bde block: always set... |
1510 |
out_clear: |
89f97496e block: fix __blkd... |
1511 |
disk_put_part(bdev->bd_part); |
1da177e4c Linux-2.6.12-rc2 |
1512 |
bdev->bd_disk = NULL; |
0762b8bde block: always set... |
1513 |
bdev->bd_part = NULL; |
87192a2a4 vfs: cache reques... |
1514 |
bdev->bd_queue = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1515 |
if (bdev != bdev->bd_contains) |
572c48921 [PATCH] sanitize ... |
1516 |
__blkdev_put(bdev->bd_contains, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1517 |
bdev->bd_contains = NULL; |
0762b8bde block: always set... |
1518 |
out_unlock_bdev: |
c039e3134 [PATCH] sem2mutex... |
1519 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1520 |
disk_unblock_events(disk); |
9df6c2991 genhd: Add helper... |
1521 |
put_disk_and_module(disk); |
4345caba3 block: NULL deref... |
1522 |
out: |
0762b8bde block: always set... |
1523 |
bdput(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1524 1525 |
return ret; } |
d4d776299 block: clean up b... |
1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 |
/** * blkdev_get - open a block device * @bdev: block_device to open * @mode: FMODE_* mask * @holder: exclusive holder identifier * * Open @bdev with @mode. If @mode includes %FMODE_EXCL, @bdev is * open with exclusive access. Specifying %FMODE_EXCL with %NULL * @holder is invalid. Exclusive opens may nest for the same @holder. * * On success, the reference count of @bdev is unchanged. On failure, * @bdev is put. * * CONTEXT: * Might sleep. * * RETURNS: * 0 on success, -errno on failure. */ |
e525fd89d block: make blkde... |
1545 |
int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) |
1da177e4c Linux-2.6.12-rc2 |
1546 |
{ |
e525fd89d block: make blkde... |
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 |
struct block_device *whole = NULL; int res; WARN_ON_ONCE((mode & FMODE_EXCL) && !holder); if ((mode & FMODE_EXCL) && holder) { whole = bd_start_claiming(bdev, holder); if (IS_ERR(whole)) { bdput(bdev); return PTR_ERR(whole); } } res = __blkdev_get(bdev, mode, 0); if (whole) { |
d4dc210f6 block: don't bloc... |
1563 |
struct gendisk *disk = whole->bd_disk; |
6a027eff6 block: reorganize... |
1564 |
/* finish claiming */ |
77ea887e4 implement in-kern... |
1565 |
mutex_lock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1566 |
spin_lock(&bdev_lock); |
77ea887e4 implement in-kern... |
1567 |
if (!res) { |
6a027eff6 block: reorganize... |
1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 |
BUG_ON(!bd_may_claim(bdev, whole, holder)); /* * Note that for a whole device bd_holders * will be incremented twice, and bd_holder * will be set to bd_may_claim before being * set to holder */ whole->bd_holders++; whole->bd_holder = bd_may_claim; bdev->bd_holders++; bdev->bd_holder = holder; } /* tell others that we're done */ BUG_ON(whole->bd_claiming != holder); whole->bd_claiming = NULL; wake_up_bit(&whole->bd_claiming, 0); spin_unlock(&bdev_lock); |
77ea887e4 implement in-kern... |
1587 1588 |
/* |
d4dc210f6 block: don't bloc... |
1589 1590 1591 1592 1593 |
* Block event polling for write claims if requested. Any * write holder makes the write_holder state stick until * all are released. This is good enough and tracking * individual writeable reference is too fragile given the * way @mode is used in blkdev_get/put(). |
77ea887e4 implement in-kern... |
1594 |
*/ |
4c49ff3fe block: blkdev_get... |
1595 1596 |
if (!res && (mode & FMODE_WRITE) && !bdev->bd_write_holder && (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) { |
77ea887e4 implement in-kern... |
1597 |
bdev->bd_write_holder = true; |
d4dc210f6 block: don't bloc... |
1598 |
disk_block_events(disk); |
77ea887e4 implement in-kern... |
1599 1600 1601 |
} mutex_unlock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1602 |
bdput(whole); |
e525fd89d block: make blkde... |
1603 1604 1605 |
} return res; |
37be41241 [PATCH] lockdep: ... |
1606 |
} |
1da177e4c Linux-2.6.12-rc2 |
1607 |
EXPORT_SYMBOL(blkdev_get); |
d4d776299 block: clean up b... |
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 |
/** * blkdev_get_by_path - open a block device by name * @path: path to the block device to open * @mode: FMODE_* mask * @holder: exclusive holder identifier * * Open the blockdevice described by the device file at @path. @mode * and @holder are identical to blkdev_get(). * * On success, the returned block_device has reference count of one. * * CONTEXT: * Might sleep. * * RETURNS: * Pointer to block_device on success, ERR_PTR(-errno) on failure. */ struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, void *holder) { struct block_device *bdev; int err; bdev = lookup_bdev(path); if (IS_ERR(bdev)) return bdev; err = blkdev_get(bdev, mode, holder); if (err) return ERR_PTR(err); |
e51900f7d block: revert blo... |
1638 1639 1640 1641 |
if ((mode & FMODE_WRITE) && bdev_read_only(bdev)) { blkdev_put(bdev, mode); return ERR_PTR(-EACCES); } |
d4d776299 block: clean up b... |
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 |
return bdev; } EXPORT_SYMBOL(blkdev_get_by_path); /** * blkdev_get_by_dev - open a block device by device number * @dev: device number of block device to open * @mode: FMODE_* mask * @holder: exclusive holder identifier * * Open the blockdevice described by device number @dev. @mode and * @holder are identical to blkdev_get(). * * Use it ONLY if you really do not have anything better - i.e. when * you are behind a truly sucky interface and all you are given is a * device number. _Never_ to be used for internal purposes. If you * ever need it - reconsider your API. * * On success, the returned block_device has reference count of one. * * CONTEXT: * Might sleep. * * RETURNS: * Pointer to block_device on success, ERR_PTR(-errno) on failure. */ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) { struct block_device *bdev; int err; bdev = bdget(dev); if (!bdev) return ERR_PTR(-ENOMEM); err = blkdev_get(bdev, mode, holder); if (err) return ERR_PTR(err); return bdev; } EXPORT_SYMBOL(blkdev_get_by_dev); |
1da177e4c Linux-2.6.12-rc2 |
1684 1685 1686 |
static int blkdev_open(struct inode * inode, struct file * filp) { struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
1687 1688 1689 1690 1691 1692 1693 1694 |
/* * Preserve backwards compatibility and allow large file access * even if userspace doesn't ask for it explicitly. Some mkfs * binary needs it. We might want to drop this workaround * during an unstable branch. */ filp->f_flags |= O_LARGEFILE; |
c35fc7a5a block_dev: suppor... |
1695 |
filp->f_mode |= FMODE_NOWAIT; |
572c48921 [PATCH] sanitize ... |
1696 1697 1698 1699 1700 1701 |
if (filp->f_flags & O_NDELAY) filp->f_mode |= FMODE_NDELAY; if (filp->f_flags & O_EXCL) filp->f_mode |= FMODE_EXCL; if ((filp->f_flags & O_ACCMODE) == 3) filp->f_mode |= FMODE_WRITE_IOCTL; |
1da177e4c Linux-2.6.12-rc2 |
1702 |
bdev = bd_acquire(inode); |
6a2aae06c [PATCH] Fix poten... |
1703 1704 |
if (bdev == NULL) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1705 |
|
572c48921 [PATCH] sanitize ... |
1706 |
filp->f_mapping = bdev->bd_inode->i_mapping; |
5660e13d2 fs: new infrastru... |
1707 |
filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping); |
572c48921 [PATCH] sanitize ... |
1708 |
|
e525fd89d block: make blkde... |
1709 |
return blkdev_get(bdev, filp->f_mode, filp); |
1da177e4c Linux-2.6.12-rc2 |
1710 |
} |
4385bab12 make blkdev_put()... |
1711 |
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) |
2e7b651df [PATCH] remove th... |
1712 |
{ |
2e7b651df [PATCH] remove th... |
1713 |
struct gendisk *disk = bdev->bd_disk; |
37be41241 [PATCH] lockdep: ... |
1714 |
struct block_device *victim = NULL; |
2e7b651df [PATCH] remove th... |
1715 |
|
6796bf54a [PATCH] lockdep: ... |
1716 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
37be41241 [PATCH] lockdep: ... |
1717 1718 |
if (for_part) bdev->bd_part_count--; |
2e7b651df [PATCH] remove th... |
1719 |
if (!--bdev->bd_openers) { |
6a027eff6 block: reorganize... |
1720 |
WARN_ON_ONCE(bdev->bd_holders); |
2e7b651df [PATCH] remove th... |
1721 1722 |
sync_blockdev(bdev); kill_bdev(bdev); |
43d1c0eb7 block: detach bde... |
1723 1724 |
bdev_write_inode(bdev); |
2e7b651df [PATCH] remove th... |
1725 1726 1727 |
} if (bdev->bd_contains == bdev) { if (disk->fops->release) |
db2a144be block_device_oper... |
1728 |
disk->fops->release(disk, mode); |
2e7b651df [PATCH] remove th... |
1729 1730 |
} if (!bdev->bd_openers) { |
0762b8bde block: always set... |
1731 1732 |
disk_put_part(bdev->bd_part); bdev->bd_part = NULL; |
2e7b651df [PATCH] remove th... |
1733 |
bdev->bd_disk = NULL; |
37be41241 [PATCH] lockdep: ... |
1734 1735 |
if (bdev != bdev->bd_contains) victim = bdev->bd_contains; |
2e7b651df [PATCH] remove th... |
1736 |
bdev->bd_contains = NULL; |
523e1d399 block: make gendi... |
1737 |
|
9df6c2991 genhd: Add helper... |
1738 |
put_disk_and_module(disk); |
2e7b651df [PATCH] remove th... |
1739 |
} |
2e7b651df [PATCH] remove th... |
1740 1741 |
mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
37be41241 [PATCH] lockdep: ... |
1742 |
if (victim) |
9a1c35427 [PATCH] pass fmod... |
1743 |
__blkdev_put(victim, mode, 1); |
2e7b651df [PATCH] remove th... |
1744 |
} |
4385bab12 make blkdev_put()... |
1745 |
void blkdev_put(struct block_device *bdev, fmode_t mode) |
37be41241 [PATCH] lockdep: ... |
1746 |
{ |
85ef06d1d block: flush MEDI... |
1747 |
mutex_lock(&bdev->bd_mutex); |
e525fd89d block: make blkde... |
1748 |
if (mode & FMODE_EXCL) { |
6a027eff6 block: reorganize... |
1749 1750 1751 1752 1753 1754 1755 |
bool bdev_free; /* * Release a claim on the device. The holder fields * are protected with bdev_lock. bd_mutex is to * synchronize disk_holder unlinking. */ |
6a027eff6 block: reorganize... |
1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 |
spin_lock(&bdev_lock); WARN_ON_ONCE(--bdev->bd_holders < 0); WARN_ON_ONCE(--bdev->bd_contains->bd_holders < 0); /* bd_contains might point to self, check in a separate step */ if ((bdev_free = !bdev->bd_holders)) bdev->bd_holder = NULL; if (!bdev->bd_contains->bd_holders) bdev->bd_contains->bd_holder = NULL; spin_unlock(&bdev_lock); |
77ea887e4 implement in-kern... |
1768 1769 1770 1771 |
/* * If this was the last claim, remove holder link and * unblock evpoll if it was a write holder. */ |
85ef06d1d block: flush MEDI... |
1772 1773 1774 |
if (bdev_free && bdev->bd_write_holder) { disk_unblock_events(bdev->bd_disk); bdev->bd_write_holder = false; |
77ea887e4 implement in-kern... |
1775 |
} |
6936217cc block: Don't chec... |
1776 |
} |
77ea887e4 implement in-kern... |
1777 |
|
85ef06d1d block: flush MEDI... |
1778 1779 1780 1781 1782 1783 1784 1785 |
/* * Trigger event checking and tell drivers to flush MEDIA_CHANGE * event. This is to ensure detection of media removal commanded * from userland - e.g. eject(1). */ disk_flush_events(bdev->bd_disk, DISK_EVENT_MEDIA_CHANGE); mutex_unlock(&bdev->bd_mutex); |
4385bab12 make blkdev_put()... |
1786 |
__blkdev_put(bdev, mode, 0); |
37be41241 [PATCH] lockdep: ... |
1787 |
} |
2e7b651df [PATCH] remove th... |
1788 |
EXPORT_SYMBOL(blkdev_put); |
1da177e4c Linux-2.6.12-rc2 |
1789 1790 |
static int blkdev_close(struct inode * inode, struct file * filp) { |
4ebb16ca9 block: introduce ... |
1791 |
struct block_device *bdev = I_BDEV(bdev_file_inode(filp)); |
4385bab12 make blkdev_put()... |
1792 1793 |
blkdev_put(bdev, filp->f_mode); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1794 |
} |
bb93e3a52 [PATCH] block: ad... |
1795 |
static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
1796 |
{ |
4ebb16ca9 block: introduce ... |
1797 |
struct block_device *bdev = I_BDEV(bdev_file_inode(file)); |
56b26add0 [PATCH] kill the ... |
1798 |
fmode_t mode = file->f_mode; |
fd4ce1acd [PATCH 1/2] kill ... |
1799 1800 1801 1802 1803 |
/* * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have * to updated it before every ioctl. */ |
56b26add0 [PATCH] kill the ... |
1804 |
if (file->f_flags & O_NDELAY) |
fd4ce1acd [PATCH 1/2] kill ... |
1805 1806 1807 |
mode |= FMODE_NDELAY; else mode &= ~FMODE_NDELAY; |
56b26add0 [PATCH] kill the ... |
1808 |
return blkdev_ioctl(bdev, mode, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1809 |
} |
87d8fe1ee add releasepage h... |
1810 |
/* |
eef993806 vfs: Rename gener... |
1811 1812 1813 1814 1815 1816 |
* Write data to the block device. Only intended for the block device itself * and the raw driver which basically is a fake block device. * * Does not take i_mutex for the write and thus is not for general purpose * use. */ |
1456c0a87 blkdev_aio_write(... |
1817 |
ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from) |
eef993806 vfs: Rename gener... |
1818 1819 |
{ struct file *file = iocb->ki_filp; |
4ebb16ca9 block: introduce ... |
1820 |
struct inode *bd_inode = bdev_file_inode(file); |
7ec7b94a3 blkdev_write_iter... |
1821 |
loff_t size = i_size_read(bd_inode); |
53362a05a fs/block-dev.c:fi... |
1822 |
struct blk_plug plug; |
eef993806 vfs: Rename gener... |
1823 |
ssize_t ret; |
5f380c7fa lift generic_writ... |
1824 |
|
7ec7b94a3 blkdev_write_iter... |
1825 1826 |
if (bdev_read_only(I_BDEV(bd_inode))) return -EPERM; |
5f380c7fa lift generic_writ... |
1827 |
|
7ec7b94a3 blkdev_write_iter... |
1828 |
if (!iov_iter_count(from)) |
5f380c7fa lift generic_writ... |
1829 |
return 0; |
7ec7b94a3 blkdev_write_iter... |
1830 1831 |
if (iocb->ki_pos >= size) return -ENOSPC; |
c35fc7a5a block_dev: suppor... |
1832 1833 |
if ((iocb->ki_flags & (IOCB_NOWAIT | IOCB_DIRECT)) == IOCB_NOWAIT) return -EOPNOTSUPP; |
7ec7b94a3 blkdev_write_iter... |
1834 |
iov_iter_truncate(from, size - iocb->ki_pos); |
eef993806 vfs: Rename gener... |
1835 |
|
53362a05a fs/block-dev.c:fi... |
1836 |
blk_start_plug(&plug); |
1456c0a87 blkdev_aio_write(... |
1837 |
ret = __generic_file_write_iter(iocb, from); |
e25922176 fs: simplify the ... |
1838 1839 |
if (ret > 0) ret = generic_write_sync(iocb, ret); |
53362a05a fs/block-dev.c:fi... |
1840 |
blk_finish_plug(&plug); |
eef993806 vfs: Rename gener... |
1841 1842 |
return ret; } |
1456c0a87 blkdev_aio_write(... |
1843 |
EXPORT_SYMBOL_GPL(blkdev_write_iter); |
eef993806 vfs: Rename gener... |
1844 |
|
b2de525f0 Return short read... |
1845 |
ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) |
684c9aaeb vfs: fix O_DIRECT... |
1846 1847 |
{ struct file *file = iocb->ki_filp; |
4ebb16ca9 block: introduce ... |
1848 |
struct inode *bd_inode = bdev_file_inode(file); |
684c9aaeb vfs: fix O_DIRECT... |
1849 |
loff_t size = i_size_read(bd_inode); |
a886038ba fs/block_dev.c: s... |
1850 |
loff_t pos = iocb->ki_pos; |
684c9aaeb vfs: fix O_DIRECT... |
1851 1852 1853 1854 1855 |
if (pos >= size) return 0; size -= pos; |
a886038ba fs/block_dev.c: s... |
1856 1857 |
iov_iter_truncate(to, size); return generic_file_read_iter(iocb, to); |
684c9aaeb vfs: fix O_DIRECT... |
1858 |
} |
b2de525f0 Return short read... |
1859 |
EXPORT_SYMBOL_GPL(blkdev_read_iter); |
684c9aaeb vfs: fix O_DIRECT... |
1860 |
|
eef993806 vfs: Rename gener... |
1861 |
/* |
87d8fe1ee add releasepage h... |
1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 |
* Try to release a page associated with block device when the system * is under memory pressure. */ static int blkdev_releasepage(struct page *page, gfp_t wait) { struct super_block *super = BDEV_I(page->mapping->host)->bdev.bd_super; if (super && super->s_op->bdev_try_to_free_page) return super->s_op->bdev_try_to_free_page(super, page, wait); return try_to_free_buffers(page); } |
7f6d5b529 dax: move writeba... |
1874 1875 1876 |
static int blkdev_writepages(struct address_space *mapping, struct writeback_control *wbc) { |
7f6d5b529 dax: move writeba... |
1877 1878 |
return generic_writepages(mapping, wbc); } |
4c54ac62d make struct def_b... |
1879 |
static const struct address_space_operations def_blk_aops = { |
1da177e4c Linux-2.6.12-rc2 |
1880 |
.readpage = blkdev_readpage, |
447f05bb4 block_dev: implem... |
1881 |
.readpages = blkdev_readpages, |
1da177e4c Linux-2.6.12-rc2 |
1882 |
.writepage = blkdev_writepage, |
6272b5a58 block_dev: conver... |
1883 1884 |
.write_begin = blkdev_write_begin, .write_end = blkdev_write_end, |
7f6d5b529 dax: move writeba... |
1885 |
.writepages = blkdev_writepages, |
87d8fe1ee add releasepage h... |
1886 |
.releasepage = blkdev_releasepage, |
1da177e4c Linux-2.6.12-rc2 |
1887 |
.direct_IO = blkdev_direct_IO, |
b45972265 mm: vmscan: take ... |
1888 |
.is_dirty_writeback = buffer_check_dirty_writeback, |
1da177e4c Linux-2.6.12-rc2 |
1889 |
}; |
25f4c4141 block: implement ... |
1890 1891 1892 1893 1894 1895 1896 1897 |
#define BLKDEV_FALLOC_FL_SUPPORTED \ (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \ FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE) static long blkdev_fallocate(struct file *file, int mode, loff_t start, loff_t len) { struct block_device *bdev = I_BDEV(bdev_file_inode(file)); |
25f4c4141 block: implement ... |
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 |
struct address_space *mapping; loff_t end = start + len - 1; loff_t isize; int error; /* Fail if we don't recognize the flags. */ if (mode & ~BLKDEV_FALLOC_FL_SUPPORTED) return -EOPNOTSUPP; /* Don't go off the end of the device. */ isize = i_size_read(bdev->bd_inode); if (start >= isize) return -EINVAL; if (end >= isize) { if (mode & FALLOC_FL_KEEP_SIZE) { len = isize - start; end = start + len - 1; } else return -EINVAL; } /* * Don't allow IO that isn't aligned to logical block size. */ if ((start | len) & (bdev_logical_block_size(bdev) - 1)) return -EINVAL; /* Invalidate the page cache, including dirty pages. */ mapping = bdev->bd_inode->i_mapping; truncate_inode_pages_range(mapping, start, end); switch (mode) { case FALLOC_FL_ZERO_RANGE: case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE: error = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, |
ee472d835 block: add a flag... |
1933 |
GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); |
25f4c4141 block: implement ... |
1934 1935 |
break; case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE: |
34045129b block_dev: use bl... |
1936 1937 |
error = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, BLKDEV_ZERO_NOFALLBACK); |
25f4c4141 block: implement ... |
1938 1939 |
break; case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE: |
25f4c4141 block: implement ... |
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 |
error = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL, 0); break; default: return -EOPNOTSUPP; } if (error) return error; /* * Invalidate again; if someone wandered in and dirtied a page, * the caller will be given -EBUSY. The third argument is * inclusive, so the rounding here is safe. */ return invalidate_inode_pages2_range(mapping, start >> PAGE_SHIFT, end >> PAGE_SHIFT); } |
4b6f5d20b [PATCH] Make most... |
1958 |
const struct file_operations def_blk_fops = { |
1da177e4c Linux-2.6.12-rc2 |
1959 1960 1961 |
.open = blkdev_open, .release = blkdev_close, .llseek = block_llseek, |
a886038ba fs/block_dev.c: s... |
1962 |
.read_iter = blkdev_read_iter, |
1456c0a87 blkdev_aio_write(... |
1963 |
.write_iter = blkdev_write_iter, |
acc93d30d Revert "block: en... |
1964 |
.mmap = generic_file_mmap, |
b1dd3b284 vfs: rename block... |
1965 |
.fsync = blkdev_fsync, |
bb93e3a52 [PATCH] block: ad... |
1966 |
.unlocked_ioctl = block_ioctl, |
1da177e4c Linux-2.6.12-rc2 |
1967 1968 1969 |
#ifdef CONFIG_COMPAT .compat_ioctl = compat_blkdev_ioctl, #endif |
1e8b33328 blockdev: remove ... |
1970 |
.splice_read = generic_file_splice_read, |
8d0207652 ->splice_write() ... |
1971 |
.splice_write = iter_file_splice_write, |
25f4c4141 block: implement ... |
1972 |
.fallocate = blkdev_fallocate, |
1da177e4c Linux-2.6.12-rc2 |
1973 1974 1975 1976 1977 1978 1979 |
}; int ioctl_by_bdev(struct block_device *bdev, unsigned cmd, unsigned long arg) { int res; mm_segment_t old_fs = get_fs(); set_fs(KERNEL_DS); |
56b26add0 [PATCH] kill the ... |
1980 |
res = blkdev_ioctl(bdev, 0, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1981 1982 1983 1984 1985 1986 1987 1988 |
set_fs(old_fs); return res; } EXPORT_SYMBOL(ioctl_by_bdev); /** * lookup_bdev - lookup a struct block_device by name |
94e2959e7 fs: fix function ... |
1989 |
* @pathname: special file representing the block device |
1da177e4c Linux-2.6.12-rc2 |
1990 |
* |
57d1b5366 block_dev: fix ke... |
1991 |
* Get a reference to the blockdevice at @pathname in the current |
1da177e4c Linux-2.6.12-rc2 |
1992 1993 1994 |
* namespace if possible and return it. Return ERR_PTR(error) * otherwise. */ |
421748ecd [PATCH] assorted ... |
1995 |
struct block_device *lookup_bdev(const char *pathname) |
1da177e4c Linux-2.6.12-rc2 |
1996 1997 1998 |
{ struct block_device *bdev; struct inode *inode; |
421748ecd [PATCH] assorted ... |
1999 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
2000 |
int error; |
421748ecd [PATCH] assorted ... |
2001 |
if (!pathname || !*pathname) |
1da177e4c Linux-2.6.12-rc2 |
2002 |
return ERR_PTR(-EINVAL); |
421748ecd [PATCH] assorted ... |
2003 |
error = kern_path(pathname, LOOKUP_FOLLOW, &path); |
1da177e4c Linux-2.6.12-rc2 |
2004 2005 |
if (error) return ERR_PTR(error); |
bb668734c VFS: assorted d_b... |
2006 |
inode = d_backing_inode(path.dentry); |
1da177e4c Linux-2.6.12-rc2 |
2007 2008 2009 2010 |
error = -ENOTBLK; if (!S_ISBLK(inode->i_mode)) goto fail; error = -EACCES; |
a2982cc92 vfs: Generalize f... |
2011 |
if (!may_open_dev(&path)) |
1da177e4c Linux-2.6.12-rc2 |
2012 2013 2014 2015 2016 2017 |
goto fail; error = -ENOMEM; bdev = bd_acquire(inode); if (!bdev) goto fail; out: |
421748ecd [PATCH] assorted ... |
2018 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
2019 2020 2021 2022 2023 |
return bdev; fail: bdev = ERR_PTR(error); goto out; } |
d5686b444 [PATCH] switch mt... |
2024 |
EXPORT_SYMBOL(lookup_bdev); |
1da177e4c Linux-2.6.12-rc2 |
2025 |
|
93b270f76 Fix over-zealous ... |
2026 |
int __invalidate_device(struct block_device *bdev, bool kill_dirty) |
b71e8a4ce [PATCH] BLOCK: Mo... |
2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 |
{ struct super_block *sb = get_super(bdev); int res = 0; if (sb) { /* * no need to lock the super, get_super holds the * read mutex so the filesystem cannot go away * under us (->put_super runs with the write lock * hold). */ shrink_dcache_sb(sb); |
93b270f76 Fix over-zealous ... |
2039 |
res = invalidate_inodes(sb, kill_dirty); |
b71e8a4ce [PATCH] BLOCK: Mo... |
2040 2041 |
drop_super(sb); } |
f98393a64 mm: remove destro... |
2042 |
invalidate_bdev(bdev); |
b71e8a4ce [PATCH] BLOCK: Mo... |
2043 2044 2045 |
return res; } EXPORT_SYMBOL(__invalidate_device); |
5c0d6b60a vfs: Create funct... |
2046 2047 2048 2049 |
void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg) { struct inode *inode, *old_inode = NULL; |
74278da9f inode: convert in... |
2050 |
spin_lock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2051 2052 |
list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list) { struct address_space *mapping = inode->i_mapping; |
af309226d block: protect it... |
2053 |
struct block_device *bdev; |
5c0d6b60a vfs: Create funct... |
2054 2055 2056 2057 2058 2059 2060 2061 2062 |
spin_lock(&inode->i_lock); if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW) || mapping->nrpages == 0) { spin_unlock(&inode->i_lock); continue; } __iget(inode); spin_unlock(&inode->i_lock); |
74278da9f inode: convert in... |
2063 |
spin_unlock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2064 2065 2066 |
/* * We hold a reference to 'inode' so it couldn't have been * removed from s_inodes list while we dropped the |
74278da9f inode: convert in... |
2067 |
* s_inode_list_lock We cannot iput the inode now as we can |
5c0d6b60a vfs: Create funct... |
2068 |
* be holding the last reference and we cannot iput it under |
74278da9f inode: convert in... |
2069 |
* s_inode_list_lock. So we keep the reference and iput it |
5c0d6b60a vfs: Create funct... |
2070 2071 2072 2073 |
* later. */ iput(old_inode); old_inode = inode; |
af309226d block: protect it... |
2074 |
bdev = I_BDEV(inode); |
5c0d6b60a vfs: Create funct... |
2075 |
|
af309226d block: protect it... |
2076 2077 2078 2079 |
mutex_lock(&bdev->bd_mutex); if (bdev->bd_openers) func(bdev, arg); mutex_unlock(&bdev->bd_mutex); |
5c0d6b60a vfs: Create funct... |
2080 |
|
74278da9f inode: convert in... |
2081 |
spin_lock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2082 |
} |
74278da9f inode: convert in... |
2083 |
spin_unlock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2084 2085 |
iput(old_inode); } |