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10#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/pagemap.h>
15#include <linux/uio.h>
16#include <linux/blkdev.h>
17#include <linux/mm.h>
18#include <linux/mount.h>
19#include <linux/fs.h>
20#include <linux/gfs2_ondisk.h>
21#include <linux/ext2_fs.h>
22#include <linux/crc32.h>
23#include <linux/writeback.h>
24#include <asm/uaccess.h>
25#include <linux/dlm.h>
26#include <linux/dlm_plock.h>
27
28#include "gfs2.h"
29#include "incore.h"
30#include "bmap.h"
31#include "dir.h"
32#include "glock.h"
33#include "glops.h"
34#include "inode.h"
35#include "log.h"
36#include "meta_io.h"
37#include "quota.h"
38#include "rgrp.h"
39#include "trans.h"
40#include "util.h"
41
42
43
44
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48
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52
53
54static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
55{
56 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
57 struct gfs2_holder i_gh;
58 loff_t error;
59
60 if (origin == 2) {
61 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
62 &i_gh);
63 if (!error) {
64 error = generic_file_llseek_unlocked(file, offset, origin);
65 gfs2_glock_dq_uninit(&i_gh);
66 }
67 } else
68 error = generic_file_llseek_unlocked(file, offset, origin);
69
70 return error;
71}
72
73
74
75
76
77
78
79
80
81
82static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
83{
84 struct inode *dir = file->f_mapping->host;
85 struct gfs2_inode *dip = GFS2_I(dir);
86 struct gfs2_holder d_gh;
87 u64 offset = file->f_pos;
88 int error;
89
90 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
91 error = gfs2_glock_nq(&d_gh);
92 if (error) {
93 gfs2_holder_uninit(&d_gh);
94 return error;
95 }
96
97 error = gfs2_dir_read(dir, &offset, dirent, filldir);
98
99 gfs2_glock_dq_uninit(&d_gh);
100
101 file->f_pos = offset;
102
103 return error;
104}
105
106
107
108
109
110
111
112
113
114
115
116static u32 fsflags_cvt(const u32 *table, u32 val)
117{
118 u32 res = 0;
119 while(val) {
120 if (val & 1)
121 res |= *table;
122 table++;
123 val >>= 1;
124 }
125 return res;
126}
127
128static const u32 fsflags_to_gfs2[32] = {
129 [3] = GFS2_DIF_SYNC,
130 [4] = GFS2_DIF_IMMUTABLE,
131 [5] = GFS2_DIF_APPENDONLY,
132 [7] = GFS2_DIF_NOATIME,
133 [12] = GFS2_DIF_EXHASH,
134 [14] = GFS2_DIF_INHERIT_JDATA,
135};
136
137static const u32 gfs2_to_fsflags[32] = {
138 [gfs2fl_Sync] = FS_SYNC_FL,
139 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
140 [gfs2fl_AppendOnly] = FS_APPEND_FL,
141 [gfs2fl_NoAtime] = FS_NOATIME_FL,
142 [gfs2fl_ExHash] = FS_INDEX_FL,
143 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
144};
145
146static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
147{
148 struct inode *inode = filp->f_path.dentry->d_inode;
149 struct gfs2_inode *ip = GFS2_I(inode);
150 struct gfs2_holder gh;
151 int error;
152 u32 fsflags;
153
154 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
155 error = gfs2_glock_nq(&gh);
156 if (error)
157 return error;
158
159 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
160 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
161 fsflags |= FS_JOURNAL_DATA_FL;
162 if (put_user(fsflags, ptr))
163 error = -EFAULT;
164
165 gfs2_glock_dq(&gh);
166 gfs2_holder_uninit(&gh);
167 return error;
168}
169
170void gfs2_set_inode_flags(struct inode *inode)
171{
172 struct gfs2_inode *ip = GFS2_I(inode);
173 unsigned int flags = inode->i_flags;
174
175 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
176 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
177 flags |= S_IMMUTABLE;
178 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
179 flags |= S_APPEND;
180 if (ip->i_diskflags & GFS2_DIF_NOATIME)
181 flags |= S_NOATIME;
182 if (ip->i_diskflags & GFS2_DIF_SYNC)
183 flags |= S_SYNC;
184 inode->i_flags = flags;
185}
186
187
188#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
189 GFS2_DIF_IMMUTABLE| \
190 GFS2_DIF_APPENDONLY| \
191 GFS2_DIF_NOATIME| \
192 GFS2_DIF_SYNC| \
193 GFS2_DIF_SYSTEM| \
194 GFS2_DIF_INHERIT_JDATA)
195
196
197
198
199
200
201
202
203static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
204{
205 struct inode *inode = filp->f_path.dentry->d_inode;
206 struct gfs2_inode *ip = GFS2_I(inode);
207 struct gfs2_sbd *sdp = GFS2_SB(inode);
208 struct buffer_head *bh;
209 struct gfs2_holder gh;
210 int error;
211 u32 new_flags, flags;
212
213 error = mnt_want_write(filp->f_path.mnt);
214 if (error)
215 return error;
216
217 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
218 if (error)
219 goto out_drop_write;
220
221 flags = ip->i_diskflags;
222 new_flags = (flags & ~mask) | (reqflags & mask);
223 if ((new_flags ^ flags) == 0)
224 goto out;
225
226 error = -EINVAL;
227 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
228 goto out;
229
230 error = -EPERM;
231 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
232 goto out;
233 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
234 goto out;
235 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
236 !capable(CAP_LINUX_IMMUTABLE))
237 goto out;
238 if (!IS_IMMUTABLE(inode)) {
239 error = gfs2_permission(inode, MAY_WRITE);
240 if (error)
241 goto out;
242 }
243 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
244 if (flags & GFS2_DIF_JDATA)
245 gfs2_log_flush(sdp, ip->i_gl);
246 error = filemap_fdatawrite(inode->i_mapping);
247 if (error)
248 goto out;
249 error = filemap_fdatawait(inode->i_mapping);
250 if (error)
251 goto out;
252 }
253 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
254 if (error)
255 goto out;
256 error = gfs2_meta_inode_buffer(ip, &bh);
257 if (error)
258 goto out_trans_end;
259 gfs2_trans_add_bh(ip->i_gl, bh, 1);
260 ip->i_diskflags = new_flags;
261 gfs2_dinode_out(ip, bh->b_data);
262 brelse(bh);
263 gfs2_set_inode_flags(inode);
264 gfs2_set_aops(inode);
265out_trans_end:
266 gfs2_trans_end(sdp);
267out:
268 gfs2_glock_dq_uninit(&gh);
269out_drop_write:
270 mnt_drop_write(filp->f_path.mnt);
271 return error;
272}
273
274static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
275{
276 struct inode *inode = filp->f_path.dentry->d_inode;
277 u32 fsflags, gfsflags;
278 if (get_user(fsflags, ptr))
279 return -EFAULT;
280 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
281 if (!S_ISDIR(inode->i_mode)) {
282 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
283 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
284 return do_gfs2_set_flags(filp, gfsflags, ~0);
285 }
286 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
287}
288
289static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
290{
291 switch(cmd) {
292 case FS_IOC_GETFLAGS:
293 return gfs2_get_flags(filp, (u32 __user *)arg);
294 case FS_IOC_SETFLAGS:
295 return gfs2_set_flags(filp, (u32 __user *)arg);
296 }
297 return -ENOTTY;
298}
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308
309
310static int gfs2_allocate_page_backing(struct page *page)
311{
312 struct inode *inode = page->mapping->host;
313 struct buffer_head bh;
314 unsigned long size = PAGE_CACHE_SIZE;
315 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
316
317 do {
318 bh.b_state = 0;
319 bh.b_size = size;
320 gfs2_block_map(inode, lblock, &bh, 1);
321 if (!buffer_mapped(&bh))
322 return -EIO;
323 size -= bh.b_size;
324 lblock += (bh.b_size >> inode->i_blkbits);
325 } while(size > 0);
326 return 0;
327}
328
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335
336
337
338static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
339{
340 struct page *page = vmf->page;
341 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
342 struct gfs2_inode *ip = GFS2_I(inode);
343 struct gfs2_sbd *sdp = GFS2_SB(inode);
344 unsigned long last_index;
345 u64 pos = page->index << PAGE_CACHE_SHIFT;
346 unsigned int data_blocks, ind_blocks, rblocks;
347 int alloc_required = 0;
348 struct gfs2_holder gh;
349 struct gfs2_alloc *al;
350 int ret;
351
352 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
353 ret = gfs2_glock_nq(&gh);
354 if (ret)
355 goto out;
356
357 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
358 set_bit(GIF_SW_PAGED, &ip->i_flags);
359
360 ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required);
361 if (ret || !alloc_required)
362 goto out_unlock;
363 ret = -ENOMEM;
364 al = gfs2_alloc_get(ip);
365 if (al == NULL)
366 goto out_unlock;
367
368 ret = gfs2_quota_lock_check(ip);
369 if (ret)
370 goto out_alloc_put;
371 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
372 al->al_requested = data_blocks + ind_blocks;
373 ret = gfs2_inplace_reserve(ip);
374 if (ret)
375 goto out_quota_unlock;
376
377 rblocks = RES_DINODE + ind_blocks;
378 if (gfs2_is_jdata(ip))
379 rblocks += data_blocks ? data_blocks : 1;
380 if (ind_blocks || data_blocks)
381 rblocks += RES_STATFS + RES_QUOTA;
382 ret = gfs2_trans_begin(sdp, rblocks, 0);
383 if (ret)
384 goto out_trans_fail;
385
386 lock_page(page);
387 ret = -EINVAL;
388 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
389 if (page->index > last_index)
390 goto out_unlock_page;
391 ret = 0;
392 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
393 goto out_unlock_page;
394 if (gfs2_is_stuffed(ip)) {
395 ret = gfs2_unstuff_dinode(ip, page);
396 if (ret)
397 goto out_unlock_page;
398 }
399 ret = gfs2_allocate_page_backing(page);
400
401out_unlock_page:
402 unlock_page(page);
403 gfs2_trans_end(sdp);
404out_trans_fail:
405 gfs2_inplace_release(ip);
406out_quota_unlock:
407 gfs2_quota_unlock(ip);
408out_alloc_put:
409 gfs2_alloc_put(ip);
410out_unlock:
411 gfs2_glock_dq(&gh);
412out:
413 gfs2_holder_uninit(&gh);
414 if (ret == -ENOMEM)
415 ret = VM_FAULT_OOM;
416 else if (ret)
417 ret = VM_FAULT_SIGBUS;
418 return ret;
419}
420
421static const struct vm_operations_struct gfs2_vm_ops = {
422 .fault = filemap_fault,
423 .page_mkwrite = gfs2_page_mkwrite,
424};
425
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436
437
438static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
439{
440 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
441
442 if (!(file->f_flags & O_NOATIME)) {
443 struct gfs2_holder i_gh;
444 int error;
445
446 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
447 error = gfs2_glock_nq(&i_gh);
448 file_accessed(file);
449 if (error == 0)
450 gfs2_glock_dq_uninit(&i_gh);
451 }
452 vma->vm_ops = &gfs2_vm_ops;
453 vma->vm_flags |= VM_CAN_NONLINEAR;
454
455 return 0;
456}
457
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464
465
466static int gfs2_open(struct inode *inode, struct file *file)
467{
468 struct gfs2_inode *ip = GFS2_I(inode);
469 struct gfs2_holder i_gh;
470 struct gfs2_file *fp;
471 int error;
472
473 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
474 if (!fp)
475 return -ENOMEM;
476
477 mutex_init(&fp->f_fl_mutex);
478
479 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
480 file->private_data = fp;
481
482 if (S_ISREG(ip->i_inode.i_mode)) {
483 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
484 &i_gh);
485 if (error)
486 goto fail;
487
488 if (!(file->f_flags & O_LARGEFILE) &&
489 ip->i_disksize > MAX_NON_LFS) {
490 error = -EOVERFLOW;
491 goto fail_gunlock;
492 }
493
494 gfs2_glock_dq_uninit(&i_gh);
495 }
496
497 return 0;
498
499fail_gunlock:
500 gfs2_glock_dq_uninit(&i_gh);
501fail:
502 file->private_data = NULL;
503 kfree(fp);
504 return error;
505}
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514
515static int gfs2_close(struct inode *inode, struct file *file)
516{
517 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
518 struct gfs2_file *fp;
519
520 fp = file->private_data;
521 file->private_data = NULL;
522
523 if (gfs2_assert_warn(sdp, fp))
524 return -EIO;
525
526 kfree(fp);
527
528 return 0;
529}
530
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549
550static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
551{
552 struct inode *inode = dentry->d_inode;
553 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
554 int ret = 0;
555
556 if (gfs2_is_jdata(GFS2_I(inode))) {
557 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
558 return 0;
559 }
560
561 if (sync_state != 0) {
562 if (!datasync)
563 ret = write_inode_now(inode, 0);
564
565 if (gfs2_is_stuffed(GFS2_I(inode)))
566 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
567 }
568
569 return ret;
570}
571
572#ifdef CONFIG_GFS2_FS_LOCKING_DLM
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
588{
589 return -EINVAL;
590}
591
592
593
594
595
596
597
598
599
600
601static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
602{
603 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
604 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
605 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
606
607 if (!(fl->fl_flags & FL_POSIX))
608 return -ENOLCK;
609 if (__mandatory_lock(&ip->i_inode))
610 return -ENOLCK;
611
612 if (cmd == F_CANCELLK) {
613
614 cmd = F_SETLK;
615 fl->fl_type = F_UNLCK;
616 }
617 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
618 return -EIO;
619 if (IS_GETLK(cmd))
620 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
621 else if (fl->fl_type == F_UNLCK)
622 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
623 else
624 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
625}
626
627static int do_flock(struct file *file, int cmd, struct file_lock *fl)
628{
629 struct gfs2_file *fp = file->private_data;
630 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
631 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
632 struct gfs2_glock *gl;
633 unsigned int state;
634 int flags;
635 int error = 0;
636
637 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
638 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
639
640 mutex_lock(&fp->f_fl_mutex);
641
642 gl = fl_gh->gh_gl;
643 if (gl) {
644 if (fl_gh->gh_state == state)
645 goto out;
646 flock_lock_file_wait(file,
647 &(struct file_lock){.fl_type = F_UNLCK});
648 gfs2_glock_dq_wait(fl_gh);
649 gfs2_holder_reinit(state, flags, fl_gh);
650 } else {
651 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
652 &gfs2_flock_glops, CREATE, &gl);
653 if (error)
654 goto out;
655 gfs2_holder_init(gl, state, flags, fl_gh);
656 gfs2_glock_put(gl);
657 }
658 error = gfs2_glock_nq(fl_gh);
659 if (error) {
660 gfs2_holder_uninit(fl_gh);
661 if (error == GLR_TRYFAILED)
662 error = -EAGAIN;
663 } else {
664 error = flock_lock_file_wait(file, fl);
665 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
666 }
667
668out:
669 mutex_unlock(&fp->f_fl_mutex);
670 return error;
671}
672
673static void do_unflock(struct file *file, struct file_lock *fl)
674{
675 struct gfs2_file *fp = file->private_data;
676 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
677
678 mutex_lock(&fp->f_fl_mutex);
679 flock_lock_file_wait(file, fl);
680 if (fl_gh->gh_gl)
681 gfs2_glock_dq_uninit(fl_gh);
682 mutex_unlock(&fp->f_fl_mutex);
683}
684
685
686
687
688
689
690
691
692
693
694static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
695{
696 if (!(fl->fl_flags & FL_FLOCK))
697 return -ENOLCK;
698 if (fl->fl_type & LOCK_MAND)
699 return -EOPNOTSUPP;
700
701 if (fl->fl_type == F_UNLCK) {
702 do_unflock(file, fl);
703 return 0;
704 } else {
705 return do_flock(file, cmd, fl);
706 }
707}
708
709const struct file_operations gfs2_file_fops = {
710 .llseek = gfs2_llseek,
711 .read = do_sync_read,
712 .aio_read = generic_file_aio_read,
713 .write = do_sync_write,
714 .aio_write = generic_file_aio_write,
715 .unlocked_ioctl = gfs2_ioctl,
716 .mmap = gfs2_mmap,
717 .open = gfs2_open,
718 .release = gfs2_close,
719 .fsync = gfs2_fsync,
720 .lock = gfs2_lock,
721 .flock = gfs2_flock,
722 .splice_read = generic_file_splice_read,
723 .splice_write = generic_file_splice_write,
724 .setlease = gfs2_setlease,
725};
726
727const struct file_operations gfs2_dir_fops = {
728 .readdir = gfs2_readdir,
729 .unlocked_ioctl = gfs2_ioctl,
730 .open = gfs2_open,
731 .release = gfs2_close,
732 .fsync = gfs2_fsync,
733 .lock = gfs2_lock,
734 .flock = gfs2_flock,
735};
736
737#endif
738
739const struct file_operations gfs2_file_fops_nolock = {
740 .llseek = gfs2_llseek,
741 .read = do_sync_read,
742 .aio_read = generic_file_aio_read,
743 .write = do_sync_write,
744 .aio_write = generic_file_aio_write,
745 .unlocked_ioctl = gfs2_ioctl,
746 .mmap = gfs2_mmap,
747 .open = gfs2_open,
748 .release = gfs2_close,
749 .fsync = gfs2_fsync,
750 .splice_read = generic_file_splice_read,
751 .splice_write = generic_file_splice_write,
752 .setlease = generic_setlease,
753};
754
755const struct file_operations gfs2_dir_fops_nolock = {
756 .readdir = gfs2_readdir,
757 .unlocked_ioctl = gfs2_ioctl,
758 .open = gfs2_open,
759 .release = gfs2_close,
760 .fsync = gfs2_fsync,
761};
762
763