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Linux/fs/gfs2/meta_io.c

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  1 /*
  2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  3  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
  4  *
  5  * This copyrighted material is made available to anyone wishing to use,
  6  * modify, copy, or redistribute it subject to the terms and conditions
  7  * of the GNU General Public License version 2.
  8  */
  9 
 10 #include <linux/sched.h>
 11 #include <linux/slab.h>
 12 #include <linux/spinlock.h>
 13 #include <linux/completion.h>
 14 #include <linux/buffer_head.h>
 15 #include <linux/mm.h>
 16 #include <linux/pagemap.h>
 17 #include <linux/writeback.h>
 18 #include <linux/swap.h>
 19 #include <linux/delay.h>
 20 #include <linux/bio.h>
 21 #include <linux/gfs2_ondisk.h>
 22 
 23 #include "gfs2.h"
 24 #include "incore.h"
 25 #include "glock.h"
 26 #include "glops.h"
 27 #include "inode.h"
 28 #include "log.h"
 29 #include "lops.h"
 30 #include "meta_io.h"
 31 #include "rgrp.h"
 32 #include "trans.h"
 33 #include "util.h"
 34 #include "trace_gfs2.h"
 35 
 36 static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wbc)
 37 {
 38         struct buffer_head *bh, *head;
 39         int nr_underway = 0;
 40         int write_op = REQ_META | REQ_PRIO |
 41                 (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
 42 
 43         BUG_ON(!PageLocked(page));
 44         BUG_ON(!page_has_buffers(page));
 45 
 46         head = page_buffers(page);
 47         bh = head;
 48 
 49         do {
 50                 if (!buffer_mapped(bh))
 51                         continue;
 52                 /*
 53                  * If it's a fully non-blocking write attempt and we cannot
 54                  * lock the buffer then redirty the page.  Note that this can
 55                  * potentially cause a busy-wait loop from flusher thread and kswapd
 56                  * activity, but those code paths have their own higher-level
 57                  * throttling.
 58                  */
 59                 if (wbc->sync_mode != WB_SYNC_NONE) {
 60                         lock_buffer(bh);
 61                 } else if (!trylock_buffer(bh)) {
 62                         redirty_page_for_writepage(wbc, page);
 63                         continue;
 64                 }
 65                 if (test_clear_buffer_dirty(bh)) {
 66                         mark_buffer_async_write(bh);
 67                 } else {
 68                         unlock_buffer(bh);
 69                 }
 70         } while ((bh = bh->b_this_page) != head);
 71 
 72         /*
 73          * The page and its buffers are protected by PageWriteback(), so we can
 74          * drop the bh refcounts early.
 75          */
 76         BUG_ON(PageWriteback(page));
 77         set_page_writeback(page);
 78 
 79         do {
 80                 struct buffer_head *next = bh->b_this_page;
 81                 if (buffer_async_write(bh)) {
 82                         submit_bh(write_op, bh);
 83                         nr_underway++;
 84                 }
 85                 bh = next;
 86         } while (bh != head);
 87         unlock_page(page);
 88 
 89         if (nr_underway == 0)
 90                 end_page_writeback(page);
 91 
 92         return 0;
 93 }
 94 
 95 const struct address_space_operations gfs2_meta_aops = {
 96         .writepage = gfs2_aspace_writepage,
 97         .releasepage = gfs2_releasepage,
 98 };
 99 
100 /**
101  * gfs2_meta_sync - Sync all buffers associated with a glock
102  * @gl: The glock
103  *
104  */
105 
106 void gfs2_meta_sync(struct gfs2_glock *gl)
107 {
108         struct address_space *mapping = gfs2_glock2aspace(gl);
109         int error;
110 
111         filemap_fdatawrite(mapping);
112         error = filemap_fdatawait(mapping);
113 
114         if (error)
115                 gfs2_io_error(gl->gl_sbd);
116 }
117 
118 /**
119  * gfs2_getbuf - Get a buffer with a given address space
120  * @gl: the glock
121  * @blkno: the block number (filesystem scope)
122  * @create: 1 if the buffer should be created
123  *
124  * Returns: the buffer
125  */
126 
127 struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
128 {
129         struct address_space *mapping = gfs2_glock2aspace(gl);
130         struct gfs2_sbd *sdp = gl->gl_sbd;
131         struct page *page;
132         struct buffer_head *bh;
133         unsigned int shift;
134         unsigned long index;
135         unsigned int bufnum;
136 
137         shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift;
138         index = blkno >> shift;             /* convert block to page */
139         bufnum = blkno - (index << shift);  /* block buf index within page */
140 
141         if (create) {
142                 for (;;) {
143                         page = grab_cache_page(mapping, index);
144                         if (page)
145                                 break;
146                         yield();
147                 }
148         } else {
149                 page = find_lock_page(mapping, index);
150                 if (!page)
151                         return NULL;
152         }
153 
154         if (!page_has_buffers(page))
155                 create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0);
156 
157         /* Locate header for our buffer within our page */
158         for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
159                 /* Do nothing */;
160         get_bh(bh);
161 
162         if (!buffer_mapped(bh))
163                 map_bh(bh, sdp->sd_vfs, blkno);
164 
165         unlock_page(page);
166         mark_page_accessed(page);
167         page_cache_release(page);
168 
169         return bh;
170 }
171 
172 static void meta_prep_new(struct buffer_head *bh)
173 {
174         struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data;
175 
176         lock_buffer(bh);
177         clear_buffer_dirty(bh);
178         set_buffer_uptodate(bh);
179         unlock_buffer(bh);
180 
181         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
182 }
183 
184 /**
185  * gfs2_meta_new - Get a block
186  * @gl: The glock associated with this block
187  * @blkno: The block number
188  *
189  * Returns: The buffer
190  */
191 
192 struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
193 {
194         struct buffer_head *bh;
195         bh = gfs2_getbuf(gl, blkno, CREATE);
196         meta_prep_new(bh);
197         return bh;
198 }
199 
200 /**
201  * gfs2_meta_read - Read a block from disk
202  * @gl: The glock covering the block
203  * @blkno: The block number
204  * @flags: flags
205  * @bhp: the place where the buffer is returned (NULL on failure)
206  *
207  * Returns: errno
208  */
209 
210 int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
211                    struct buffer_head **bhp)
212 {
213         struct gfs2_sbd *sdp = gl->gl_sbd;
214         struct buffer_head *bh;
215 
216         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
217                 *bhp = NULL;
218                 return -EIO;
219         }
220 
221         *bhp = bh = gfs2_getbuf(gl, blkno, CREATE);
222 
223         lock_buffer(bh);
224         if (buffer_uptodate(bh)) {
225                 unlock_buffer(bh);
226                 return 0;
227         }
228         bh->b_end_io = end_buffer_read_sync;
229         get_bh(bh);
230         submit_bh(READ_SYNC | REQ_META | REQ_PRIO, bh);
231         if (!(flags & DIO_WAIT))
232                 return 0;
233 
234         wait_on_buffer(bh);
235         if (unlikely(!buffer_uptodate(bh))) {
236                 struct gfs2_trans *tr = current->journal_info;
237                 if (tr && tr->tr_touched)
238                         gfs2_io_error_bh(sdp, bh);
239                 brelse(bh);
240                 *bhp = NULL;
241                 return -EIO;
242         }
243 
244         return 0;
245 }
246 
247 /**
248  * gfs2_meta_wait - Reread a block from disk
249  * @sdp: the filesystem
250  * @bh: The block to wait for
251  *
252  * Returns: errno
253  */
254 
255 int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
256 {
257         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
258                 return -EIO;
259 
260         wait_on_buffer(bh);
261 
262         if (!buffer_uptodate(bh)) {
263                 struct gfs2_trans *tr = current->journal_info;
264                 if (tr && tr->tr_touched)
265                         gfs2_io_error_bh(sdp, bh);
266                 return -EIO;
267         }
268         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
269                 return -EIO;
270 
271         return 0;
272 }
273 
274 void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int meta)
275 {
276         struct address_space *mapping = bh->b_page->mapping;
277         struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
278         struct gfs2_bufdata *bd = bh->b_private;
279 
280         if (test_clear_buffer_pinned(bh)) {
281                 trace_gfs2_pin(bd, 0);
282                 atomic_dec(&sdp->sd_log_pinned);
283                 list_del_init(&bd->bd_list);
284                 if (meta) {
285                         gfs2_assert_warn(sdp, sdp->sd_log_num_buf);
286                         sdp->sd_log_num_buf--;
287                         tr->tr_num_buf_rm++;
288                 } else {
289                         gfs2_assert_warn(sdp, sdp->sd_log_num_databuf);
290                         sdp->sd_log_num_databuf--;
291                         tr->tr_num_databuf_rm++;
292                 }
293                 tr->tr_touched = 1;
294                 brelse(bh);
295         }
296         if (bd) {
297                 spin_lock(&sdp->sd_ail_lock);
298                 if (bd->bd_tr) {
299                         gfs2_trans_add_revoke(sdp, bd);
300                 }
301                 spin_unlock(&sdp->sd_ail_lock);
302         }
303         clear_buffer_dirty(bh);
304         clear_buffer_uptodate(bh);
305 }
306 
307 /**
308  * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore
309  * @ip: the inode who owns the buffers
310  * @bstart: the first buffer in the run
311  * @blen: the number of buffers in the run
312  *
313  */
314 
315 void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
316 {
317         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
318         struct buffer_head *bh;
319 
320         while (blen) {
321                 bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
322                 if (bh) {
323                         lock_buffer(bh);
324                         gfs2_log_lock(sdp);
325                         gfs2_remove_from_journal(bh, current->journal_info, 1);
326                         gfs2_log_unlock(sdp);
327                         unlock_buffer(bh);
328                         brelse(bh);
329                 }
330 
331                 bstart++;
332                 blen--;
333         }
334 }
335 
336 /**
337  * gfs2_meta_indirect_buffer - Get a metadata buffer
338  * @ip: The GFS2 inode
339  * @height: The level of this buf in the metadata (indir addr) tree (if any)
340  * @num: The block number (device relative) of the buffer
341  * @bhp: the buffer is returned here
342  *
343  * Returns: errno
344  */
345 
346 int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
347                               struct buffer_head **bhp)
348 {
349         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
350         struct gfs2_glock *gl = ip->i_gl;
351         struct buffer_head *bh;
352         int ret = 0;
353         u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
354 
355         ret = gfs2_meta_read(gl, num, DIO_WAIT, &bh);
356         if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
357                 brelse(bh);
358                 ret = -EIO;
359         }
360         *bhp = bh;
361         return ret;
362 }
363 
364 /**
365  * gfs2_meta_ra - start readahead on an extent of a file
366  * @gl: the glock the blocks belong to
367  * @dblock: the starting disk block
368  * @extlen: the number of blocks in the extent
369  *
370  * returns: the first buffer in the extent
371  */
372 
373 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
374 {
375         struct gfs2_sbd *sdp = gl->gl_sbd;
376         struct buffer_head *first_bh, *bh;
377         u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
378                           sdp->sd_sb.sb_bsize_shift;
379 
380         BUG_ON(!extlen);
381 
382         if (max_ra < 1)
383                 max_ra = 1;
384         if (extlen > max_ra)
385                 extlen = max_ra;
386 
387         first_bh = gfs2_getbuf(gl, dblock, CREATE);
388 
389         if (buffer_uptodate(first_bh))
390                 goto out;
391         if (!buffer_locked(first_bh))
392                 ll_rw_block(READ_SYNC | REQ_META, 1, &first_bh);
393 
394         dblock++;
395         extlen--;
396 
397         while (extlen) {
398                 bh = gfs2_getbuf(gl, dblock, CREATE);
399 
400                 if (!buffer_uptodate(bh) && !buffer_locked(bh))
401                         ll_rw_block(READA | REQ_META, 1, &bh);
402                 brelse(bh);
403                 dblock++;
404                 extlen--;
405                 if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
406                         goto out;
407         }
408 
409         wait_on_buffer(first_bh);
410 out:
411         return first_bh;
412 }
413 
414 

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