2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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.
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/gfs2_ondisk.h>
15 #include <linux/crc32.h>
16 #include <linux/lm_interface.h>
29 #include "ops_address.h"
31 /* This doesn't need to be that large as max 64 bit pointers in a 4k
32 * block is 512, so __u16 is fine for that. It saves stack space to
36 __u16 mp_list
[GFS2_MAX_META_HEIGHT
];
39 typedef int (*block_call_t
) (struct gfs2_inode
*ip
, struct buffer_head
*dibh
,
40 struct buffer_head
*bh
, __be64
*top
,
41 __be64
*bottom
, unsigned int height
,
46 unsigned int sm_height
;
50 * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
52 * @dibh: the dinode buffer
53 * @block: the block number that was allocated
54 * @private: any locked page held by the caller process
59 static int gfs2_unstuffer_page(struct gfs2_inode
*ip
, struct buffer_head
*dibh
,
60 u64 block
, struct page
*page
)
62 struct inode
*inode
= &ip
->i_inode
;
63 struct buffer_head
*bh
;
66 if (!page
|| page
->index
) {
67 page
= grab_cache_page(inode
->i_mapping
, 0);
73 if (!PageUptodate(page
)) {
74 void *kaddr
= kmap(page
);
76 memcpy(kaddr
, dibh
->b_data
+ sizeof(struct gfs2_dinode
),
78 memset(kaddr
+ ip
->i_di
.di_size
, 0,
79 PAGE_CACHE_SIZE
- ip
->i_di
.di_size
);
82 SetPageUptodate(page
);
85 if (!page_has_buffers(page
))
86 create_empty_buffers(page
, 1 << inode
->i_blkbits
,
89 bh
= page_buffers(page
);
91 if (!buffer_mapped(bh
))
92 map_bh(bh
, inode
->i_sb
, block
);
94 set_buffer_uptodate(bh
);
95 if (!gfs2_is_jdata(ip
))
96 mark_buffer_dirty(bh
);
97 if (!gfs2_is_writeback(ip
))
98 gfs2_trans_add_bh(ip
->i_gl
, bh
, 0);
102 page_cache_release(page
);
109 * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
110 * @ip: The GFS2 inode to unstuff
111 * @unstuffer: the routine that handles unstuffing a non-zero length file
112 * @private: private data for the unstuffer
114 * This routine unstuffs a dinode and returns it to a "normal" state such
115 * that the height can be grown in the traditional way.
120 int gfs2_unstuff_dinode(struct gfs2_inode
*ip
, struct page
*page
)
122 struct buffer_head
*bh
, *dibh
;
123 struct gfs2_dinode
*di
;
125 int isdir
= gfs2_is_dir(ip
);
128 down_write(&ip
->i_rw_mutex
);
130 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
134 if (ip
->i_di
.di_size
) {
135 /* Get a free block, fill it with the stuffed data,
136 and write it out to disk */
139 block
= gfs2_alloc_meta(ip
);
141 error
= gfs2_dir_get_new_buffer(ip
, block
, &bh
);
144 gfs2_buffer_copy_tail(bh
, sizeof(struct gfs2_meta_header
),
145 dibh
, sizeof(struct gfs2_dinode
));
148 block
= gfs2_alloc_data(ip
);
150 error
= gfs2_unstuffer_page(ip
, dibh
, block
, page
);
156 /* Set up the pointer to the new block */
158 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
159 di
= (struct gfs2_dinode
*)dibh
->b_data
;
160 gfs2_buffer_clear_tail(dibh
, sizeof(struct gfs2_dinode
));
162 if (ip
->i_di
.di_size
) {
163 *(__be64
*)(di
+ 1) = cpu_to_be64(block
);
164 ip
->i_di
.di_blocks
++;
165 gfs2_set_inode_blocks(&ip
->i_inode
);
166 di
->di_blocks
= cpu_to_be64(ip
->i_di
.di_blocks
);
170 di
->di_height
= cpu_to_be16(1);
175 up_write(&ip
->i_rw_mutex
);
180 * build_height - Build a metadata tree of the requested height
181 * @ip: The GFS2 inode
182 * @height: The height to build to
188 static int build_height(struct inode
*inode
, unsigned height
)
190 struct gfs2_inode
*ip
= GFS2_I(inode
);
191 unsigned new_height
= height
- ip
->i_height
;
192 struct buffer_head
*dibh
;
193 struct buffer_head
*blocks
[GFS2_MAX_META_HEIGHT
];
194 struct gfs2_dinode
*di
;
200 if (height
<= ip
->i_height
)
203 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
207 for(n
= 0; n
< new_height
; n
++) {
208 bn
= gfs2_alloc_meta(ip
);
209 blocks
[n
] = gfs2_meta_new(ip
->i_gl
, bn
);
210 gfs2_trans_add_bh(ip
->i_gl
, blocks
[n
], 1);
214 bn
= blocks
[0]->b_blocknr
;
215 if (new_height
> 1) {
216 for(; n
< new_height
-1; n
++) {
217 gfs2_metatype_set(blocks
[n
], GFS2_METATYPE_IN
,
219 gfs2_buffer_clear_tail(blocks
[n
],
220 sizeof(struct gfs2_meta_header
));
221 bp
= (__be64
*)(blocks
[n
]->b_data
+
222 sizeof(struct gfs2_meta_header
));
223 *bp
= cpu_to_be64(blocks
[n
+1]->b_blocknr
);
228 gfs2_metatype_set(blocks
[n
], GFS2_METATYPE_IN
, GFS2_FORMAT_IN
);
229 gfs2_buffer_copy_tail(blocks
[n
], sizeof(struct gfs2_meta_header
),
230 dibh
, sizeof(struct gfs2_dinode
));
232 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
233 di
= (struct gfs2_dinode
*)dibh
->b_data
;
234 gfs2_buffer_clear_tail(dibh
, sizeof(struct gfs2_dinode
));
235 *(__be64
*)(di
+ 1) = cpu_to_be64(bn
);
236 ip
->i_height
+= new_height
;
237 ip
->i_di
.di_blocks
+= new_height
;
238 gfs2_set_inode_blocks(&ip
->i_inode
);
239 di
->di_height
= cpu_to_be16(ip
->i_height
);
240 di
->di_blocks
= cpu_to_be64(ip
->i_di
.di_blocks
);
246 * find_metapath - Find path through the metadata tree
247 * @ip: The inode pointer
248 * @mp: The metapath to return the result in
249 * @block: The disk block to look up
251 * This routine returns a struct metapath structure that defines a path
252 * through the metadata of inode "ip" to get to block "block".
255 * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a
256 * filesystem with a blocksize of 4096.
258 * find_metapath() would return a struct metapath structure set to:
259 * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48,
260 * and mp_list[2] = 165.
262 * That means that in order to get to the block containing the byte at
263 * offset 101342453, we would load the indirect block pointed to by pointer
264 * 0 in the dinode. We would then load the indirect block pointed to by
265 * pointer 48 in that indirect block. We would then load the data block
266 * pointed to by pointer 165 in that indirect block.
268 * ----------------------------------------
273 * ----------------------------------------
277 * ----------------------------------------
281 * |0 5 6 7 8 9 0 1 2|
282 * ----------------------------------------
286 * ----------------------------------------
291 * ----------------------------------------
295 * ----------------------------------------
296 * | Data block containing offset |
300 * ----------------------------------------
304 static void find_metapath(struct gfs2_inode
*ip
, u64 block
,
307 struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
311 for (i
= ip
->i_height
; i
--;)
312 mp
->mp_list
[i
] = do_div(b
, sdp
->sd_inptrs
);
317 * metapointer - Return pointer to start of metadata in a buffer
319 * @height: The metadata height (0 = dinode)
322 * Return a pointer to the block number of the next height of the metadata
323 * tree given a buffer containing the pointer to the current height of the
327 static inline __be64
*metapointer(struct buffer_head
*bh
, int *boundary
,
328 unsigned int height
, const struct metapath
*mp
)
330 unsigned int head_size
= (height
> 0) ?
331 sizeof(struct gfs2_meta_header
) : sizeof(struct gfs2_dinode
);
334 ptr
= ((__be64
*)(bh
->b_data
+ head_size
)) + mp
->mp_list
[height
];
335 if (ptr
+ 1 == (__be64
*)(bh
->b_data
+ bh
->b_size
))
341 * lookup_block - Get the next metadata block in metadata tree
342 * @ip: The GFS2 inode
343 * @bh: Buffer containing the pointers to metadata blocks
344 * @height: The height of the tree (0 = dinode)
346 * @create: Non-zero if we may create a new meatdata block
347 * @new: Used to indicate if we did create a new metadata block
348 * @block: the returned disk block number
350 * Given a metatree, complete to a particular height, checks to see if the next
351 * height of the tree exists. If not the next height of the tree is created.
352 * The block number of the next height of the metadata tree is returned.
356 static int lookup_block(struct gfs2_inode
*ip
, struct buffer_head
*bh
,
357 unsigned int height
, struct metapath
*mp
, int create
,
358 int *new, u64
*block
)
361 __be64
*ptr
= metapointer(bh
, &boundary
, height
, mp
);
364 *block
= be64_to_cpu(*ptr
);
373 if (height
== ip
->i_height
- 1 && !gfs2_is_dir(ip
))
374 *block
= gfs2_alloc_data(ip
);
376 *block
= gfs2_alloc_meta(ip
);
378 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
380 *ptr
= cpu_to_be64(*block
);
381 ip
->i_di
.di_blocks
++;
382 gfs2_set_inode_blocks(&ip
->i_inode
);
388 static inline void bmap_lock(struct inode
*inode
, int create
)
390 struct gfs2_inode
*ip
= GFS2_I(inode
);
392 down_write(&ip
->i_rw_mutex
);
394 down_read(&ip
->i_rw_mutex
);
397 static inline void bmap_unlock(struct inode
*inode
, int create
)
399 struct gfs2_inode
*ip
= GFS2_I(inode
);
401 up_write(&ip
->i_rw_mutex
);
403 up_read(&ip
->i_rw_mutex
);
407 * gfs2_block_map - Map a block from an inode to a disk block
409 * @lblock: The logical block number
410 * @bh_map: The bh to be mapped
412 * Find the block number on the current device which corresponds to an
413 * inode's block. If the block had to be created, "new" will be set.
418 int gfs2_block_map(struct inode
*inode
, sector_t lblock
,
419 struct buffer_head
*bh_map
, int create
)
421 struct gfs2_inode
*ip
= GFS2_I(inode
);
422 struct gfs2_sbd
*sdp
= GFS2_SB(inode
);
423 struct buffer_head
*bh
;
424 unsigned int bsize
= sdp
->sd_sb
.sb_bsize
;
425 unsigned int end_of_metadata
;
431 unsigned int maxlen
= bh_map
->b_size
>> inode
->i_blkbits
;
434 struct buffer_head
*dibh
= NULL
;
435 const u64
*arr
= sdp
->sd_heightsize
;
438 if (gfs2_assert_warn(sdp
, !gfs2_is_stuffed(ip
)))
441 bmap_lock(inode
, create
);
442 clear_buffer_mapped(bh_map
);
443 clear_buffer_new(bh_map
);
444 clear_buffer_boundary(bh_map
);
445 if (gfs2_is_dir(ip
)) {
446 bsize
= sdp
->sd_jbsize
;
447 arr
= sdp
->sd_jheightsize
;
449 size
= (lblock
+ 1) * bsize
;
451 if (size
> arr
[ip
->i_height
]) {
452 u8 height
= ip
->i_height
;
455 while (size
> arr
[height
])
457 error
= build_height(inode
, height
);
462 find_metapath(ip
, lblock
, &mp
);
463 end_of_metadata
= ip
->i_height
- 1;
464 error
= gfs2_meta_inode_buffer(ip
, &bh
);
470 for (x
= 0; x
< end_of_metadata
; x
++) {
471 lookup_block(ip
, bh
, x
, &mp
, create
, &new, &dblock
);
476 error
= gfs2_meta_indirect_buffer(ip
, x
+1, dblock
, new, &bh
);
481 boundary
= lookup_block(ip
, bh
, end_of_metadata
, &mp
, create
, &new, &dblock
);
483 map_bh(bh_map
, inode
->i_sb
, dblock
);
485 set_buffer_boundary(bh_map
);
487 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
488 gfs2_dinode_out(ip
, dibh
->b_data
);
489 set_buffer_new(bh_map
);
492 while(--maxlen
&& !buffer_boundary(bh_map
)) {
495 mp
.mp_list
[end_of_metadata
]++;
496 boundary
= lookup_block(ip
, bh
, end_of_metadata
, &mp
, 0, &new, &eblock
);
497 if (eblock
!= ++dblock
)
499 bh_map
->b_size
+= (1 << inode
->i_blkbits
);
501 set_buffer_boundary(bh_map
);
511 bmap_unlock(inode
, create
);
516 * Deprecated: do not use in new code
518 int gfs2_extent_map(struct inode
*inode
, u64 lblock
, int *new, u64
*dblock
, unsigned *extlen
)
520 struct buffer_head bh
= { .b_state
= 0, .b_blocknr
= 0 };
528 bh
.b_size
= 1 << (inode
->i_blkbits
+ 5);
529 ret
= gfs2_block_map(inode
, lblock
, &bh
, create
);
530 *extlen
= bh
.b_size
>> inode
->i_blkbits
;
531 *dblock
= bh
.b_blocknr
;
540 * recursive_scan - recursively scan through the end of a file
542 * @dibh: the dinode buffer
543 * @mp: the path through the metadata to the point to start
544 * @height: the height the recursion is at
545 * @block: the indirect block to look at
546 * @first: 1 if this is the first block
547 * @bc: the call to make for each piece of metadata
548 * @data: data opaque to this function to pass to @bc
550 * When this is first called @height and @block should be zero and
551 * @first should be 1.
556 static int recursive_scan(struct gfs2_inode
*ip
, struct buffer_head
*dibh
,
557 struct metapath
*mp
, unsigned int height
,
558 u64 block
, int first
, block_call_t bc
,
561 struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
562 struct buffer_head
*bh
= NULL
;
563 __be64
*top
, *bottom
;
566 int mh_size
= sizeof(struct gfs2_meta_header
);
569 error
= gfs2_meta_inode_buffer(ip
, &bh
);
574 top
= (__be64
*)(bh
->b_data
+ sizeof(struct gfs2_dinode
)) + mp
->mp_list
[0];
575 bottom
= (__be64
*)(bh
->b_data
+ sizeof(struct gfs2_dinode
)) + sdp
->sd_diptrs
;
577 error
= gfs2_meta_indirect_buffer(ip
, height
, block
, 0, &bh
);
581 top
= (__be64
*)(bh
->b_data
+ mh_size
) +
582 (first
? mp
->mp_list
[height
] : 0);
584 bottom
= (__be64
*)(bh
->b_data
+ mh_size
) + sdp
->sd_inptrs
;
587 error
= bc(ip
, dibh
, bh
, top
, bottom
, height
, data
);
591 if (height
< ip
->i_height
- 1)
592 for (; top
< bottom
; top
++, first
= 0) {
596 bn
= be64_to_cpu(*top
);
598 error
= recursive_scan(ip
, dibh
, mp
, height
+ 1, bn
,
610 * do_strip - Look for a layer a particular layer of the file and strip it off
612 * @dibh: the dinode buffer
613 * @bh: A buffer of pointers
614 * @top: The first pointer in the buffer
615 * @bottom: One more than the last pointer
616 * @height: the height this buffer is at
617 * @data: a pointer to a struct strip_mine
622 static int do_strip(struct gfs2_inode
*ip
, struct buffer_head
*dibh
,
623 struct buffer_head
*bh
, __be64
*top
, __be64
*bottom
,
624 unsigned int height
, void *data
)
626 struct strip_mine
*sm
= data
;
627 struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
628 struct gfs2_rgrp_list rlist
;
632 unsigned int rg_blocks
= 0;
634 unsigned int revokes
= 0;
641 if (height
!= sm
->sm_height
)
649 metadata
= (height
!= ip
->i_height
- 1);
651 revokes
= (height
) ? sdp
->sd_inptrs
: sdp
->sd_diptrs
;
653 error
= gfs2_rindex_hold(sdp
, &ip
->i_alloc
->al_ri_gh
);
657 memset(&rlist
, 0, sizeof(struct gfs2_rgrp_list
));
661 for (p
= top
; p
< bottom
; p
++) {
665 bn
= be64_to_cpu(*p
);
667 if (bstart
+ blen
== bn
)
671 gfs2_rlist_add(sdp
, &rlist
, bstart
);
679 gfs2_rlist_add(sdp
, &rlist
, bstart
);
681 goto out
; /* Nothing to do */
683 gfs2_rlist_alloc(&rlist
, LM_ST_EXCLUSIVE
);
685 for (x
= 0; x
< rlist
.rl_rgrps
; x
++) {
686 struct gfs2_rgrpd
*rgd
;
687 rgd
= rlist
.rl_ghs
[x
].gh_gl
->gl_object
;
688 rg_blocks
+= rgd
->rd_length
;
691 error
= gfs2_glock_nq_m(rlist
.rl_rgrps
, rlist
.rl_ghs
);
695 error
= gfs2_trans_begin(sdp
, rg_blocks
+ RES_DINODE
+
696 RES_INDIRECT
+ RES_STATFS
+ RES_QUOTA
,
701 down_write(&ip
->i_rw_mutex
);
703 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
704 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
709 for (p
= top
; p
< bottom
; p
++) {
713 bn
= be64_to_cpu(*p
);
715 if (bstart
+ blen
== bn
)
720 gfs2_free_meta(ip
, bstart
, blen
);
722 gfs2_free_data(ip
, bstart
, blen
);
730 if (!ip
->i_di
.di_blocks
)
731 gfs2_consist_inode(ip
);
732 ip
->i_di
.di_blocks
--;
733 gfs2_set_inode_blocks(&ip
->i_inode
);
737 gfs2_free_meta(ip
, bstart
, blen
);
739 gfs2_free_data(ip
, bstart
, blen
);
742 ip
->i_inode
.i_mtime
= ip
->i_inode
.i_ctime
= CURRENT_TIME
;
744 gfs2_dinode_out(ip
, dibh
->b_data
);
746 up_write(&ip
->i_rw_mutex
);
751 gfs2_glock_dq_m(rlist
.rl_rgrps
, rlist
.rl_ghs
);
753 gfs2_rlist_free(&rlist
);
755 gfs2_glock_dq_uninit(&ip
->i_alloc
->al_ri_gh
);
760 * do_grow - Make a file look bigger than it is
762 * @size: the size to set the file to
764 * Called with an exclusive lock on @ip.
769 static int do_grow(struct gfs2_inode
*ip
, u64 size
)
771 struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
772 struct gfs2_alloc
*al
;
773 struct buffer_head
*dibh
;
776 al
= gfs2_alloc_get(ip
);
778 error
= gfs2_quota_lock(ip
, NO_QUOTA_CHANGE
, NO_QUOTA_CHANGE
);
782 error
= gfs2_quota_check(ip
, ip
->i_inode
.i_uid
, ip
->i_inode
.i_gid
);
786 al
->al_requested
= sdp
->sd_max_height
+ RES_DATA
;
788 error
= gfs2_inplace_reserve(ip
);
792 error
= gfs2_trans_begin(sdp
,
793 sdp
->sd_max_height
+ al
->al_rgd
->rd_length
+
794 RES_JDATA
+ RES_DINODE
+ RES_STATFS
+ RES_QUOTA
, 0);
798 if (size
> sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_dinode
)) {
799 const u64
*arr
= sdp
->sd_heightsize
;
800 if (gfs2_is_stuffed(ip
)) {
801 error
= gfs2_unstuff_dinode(ip
, NULL
);
806 down_write(&ip
->i_rw_mutex
);
807 if (size
> arr
[ip
->i_height
]) {
808 u8 height
= ip
->i_height
;
809 while(size
> arr
[height
])
811 error
= build_height(&ip
->i_inode
, height
);
813 up_write(&ip
->i_rw_mutex
);
818 ip
->i_di
.di_size
= size
;
819 ip
->i_inode
.i_mtime
= ip
->i_inode
.i_ctime
= CURRENT_TIME
;
821 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
825 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
826 gfs2_dinode_out(ip
, dibh
->b_data
);
832 gfs2_inplace_release(ip
);
834 gfs2_quota_unlock(ip
);
842 * gfs2_block_truncate_page - Deal with zeroing out data for truncate
844 * This is partly borrowed from ext3.
846 static int gfs2_block_truncate_page(struct address_space
*mapping
)
848 struct inode
*inode
= mapping
->host
;
849 struct gfs2_inode
*ip
= GFS2_I(inode
);
850 loff_t from
= inode
->i_size
;
851 unsigned long index
= from
>> PAGE_CACHE_SHIFT
;
852 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
853 unsigned blocksize
, iblock
, length
, pos
;
854 struct buffer_head
*bh
;
858 page
= grab_cache_page(mapping
, index
);
862 blocksize
= inode
->i_sb
->s_blocksize
;
863 length
= blocksize
- (offset
& (blocksize
- 1));
864 iblock
= index
<< (PAGE_CACHE_SHIFT
- inode
->i_sb
->s_blocksize_bits
);
866 if (!page_has_buffers(page
))
867 create_empty_buffers(page
, blocksize
, 0);
869 /* Find the buffer that contains "offset" */
870 bh
= page_buffers(page
);
872 while (offset
>= pos
) {
873 bh
= bh
->b_this_page
;
880 if (!buffer_mapped(bh
)) {
881 gfs2_block_map(inode
, iblock
, bh
, 0);
882 /* unmapped? It's a hole - nothing to do */
883 if (!buffer_mapped(bh
))
887 /* Ok, it's mapped. Make sure it's up-to-date */
888 if (PageUptodate(page
))
889 set_buffer_uptodate(bh
);
891 if (!buffer_uptodate(bh
)) {
893 ll_rw_block(READ
, 1, &bh
);
895 /* Uhhuh. Read error. Complain and punt. */
896 if (!buffer_uptodate(bh
))
901 if (!gfs2_is_writeback(ip
))
902 gfs2_trans_add_bh(ip
->i_gl
, bh
, 0);
904 zero_user(page
, offset
, length
);
908 page_cache_release(page
);
912 static int trunc_start(struct gfs2_inode
*ip
, u64 size
)
914 struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
915 struct buffer_head
*dibh
;
916 int journaled
= gfs2_is_jdata(ip
);
919 error
= gfs2_trans_begin(sdp
,
920 RES_DINODE
+ (journaled
? RES_JDATA
: 0), 0);
924 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
928 if (gfs2_is_stuffed(ip
)) {
929 ip
->i_di
.di_size
= size
;
930 ip
->i_inode
.i_mtime
= ip
->i_inode
.i_ctime
= CURRENT_TIME
;
931 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
932 gfs2_dinode_out(ip
, dibh
->b_data
);
933 gfs2_buffer_clear_tail(dibh
, sizeof(struct gfs2_dinode
) + size
);
937 if (size
& (u64
)(sdp
->sd_sb
.sb_bsize
- 1))
938 error
= gfs2_block_truncate_page(ip
->i_inode
.i_mapping
);
941 ip
->i_di
.di_size
= size
;
942 ip
->i_inode
.i_mtime
= ip
->i_inode
.i_ctime
= CURRENT_TIME
;
943 ip
->i_di
.di_flags
|= GFS2_DIF_TRUNC_IN_PROG
;
944 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
945 gfs2_dinode_out(ip
, dibh
->b_data
);
956 static int trunc_dealloc(struct gfs2_inode
*ip
, u64 size
)
958 unsigned int height
= ip
->i_height
;
966 lblock
= (size
- 1) >> GFS2_SB(&ip
->i_inode
)->sd_sb
.sb_bsize_shift
;
968 find_metapath(ip
, lblock
, &mp
);
971 error
= gfs2_quota_hold(ip
, NO_QUOTA_CHANGE
, NO_QUOTA_CHANGE
);
976 struct strip_mine sm
;
977 sm
.sm_first
= !!size
;
978 sm
.sm_height
= height
;
980 error
= recursive_scan(ip
, NULL
, &mp
, 0, 0, 1, do_strip
, &sm
);
985 gfs2_quota_unhold(ip
);
992 static int trunc_end(struct gfs2_inode
*ip
)
994 struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
995 struct buffer_head
*dibh
;
998 error
= gfs2_trans_begin(sdp
, RES_DINODE
, 0);
1002 down_write(&ip
->i_rw_mutex
);
1004 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
1008 if (!ip
->i_di
.di_size
) {
1010 ip
->i_di
.di_goal_meta
=
1011 ip
->i_di
.di_goal_data
=
1013 gfs2_buffer_clear_tail(dibh
, sizeof(struct gfs2_dinode
));
1015 ip
->i_inode
.i_mtime
= ip
->i_inode
.i_ctime
= CURRENT_TIME
;
1016 ip
->i_di
.di_flags
&= ~GFS2_DIF_TRUNC_IN_PROG
;
1018 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
1019 gfs2_dinode_out(ip
, dibh
->b_data
);
1023 up_write(&ip
->i_rw_mutex
);
1024 gfs2_trans_end(sdp
);
1029 * do_shrink - make a file smaller
1031 * @size: the size to make the file
1032 * @truncator: function to truncate the last partial block
1034 * Called with an exclusive lock on @ip.
1039 static int do_shrink(struct gfs2_inode
*ip
, u64 size
)
1043 error
= trunc_start(ip
, size
);
1049 error
= trunc_dealloc(ip
, size
);
1051 error
= trunc_end(ip
);
1056 static int do_touch(struct gfs2_inode
*ip
, u64 size
)
1058 struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
1059 struct buffer_head
*dibh
;
1062 error
= gfs2_trans_begin(sdp
, RES_DINODE
, 0);
1066 down_write(&ip
->i_rw_mutex
);
1068 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
1072 ip
->i_inode
.i_mtime
= ip
->i_inode
.i_ctime
= CURRENT_TIME
;
1073 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
1074 gfs2_dinode_out(ip
, dibh
->b_data
);
1078 up_write(&ip
->i_rw_mutex
);
1079 gfs2_trans_end(sdp
);
1084 * gfs2_truncatei - make a file a given size
1086 * @size: the size to make the file
1087 * @truncator: function to truncate the last partial block
1089 * The file size can grow, shrink, or stay the same size.
1094 int gfs2_truncatei(struct gfs2_inode
*ip
, u64 size
)
1098 if (gfs2_assert_warn(GFS2_SB(&ip
->i_inode
), S_ISREG(ip
->i_inode
.i_mode
)))
1101 if (size
> ip
->i_di
.di_size
)
1102 error
= do_grow(ip
, size
);
1103 else if (size
< ip
->i_di
.di_size
)
1104 error
= do_shrink(ip
, size
);
1106 /* update time stamps */
1107 error
= do_touch(ip
, size
);
1112 int gfs2_truncatei_resume(struct gfs2_inode
*ip
)
1115 error
= trunc_dealloc(ip
, ip
->i_di
.di_size
);
1117 error
= trunc_end(ip
);
1121 int gfs2_file_dealloc(struct gfs2_inode
*ip
)
1123 return trunc_dealloc(ip
, 0);
1127 * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
1129 * @len: the number of bytes to be written to the file
1130 * @data_blocks: returns the number of data blocks required
1131 * @ind_blocks: returns the number of indirect blocks required
1135 void gfs2_write_calc_reserv(struct gfs2_inode
*ip
, unsigned int len
,
1136 unsigned int *data_blocks
, unsigned int *ind_blocks
)
1138 struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
1141 if (gfs2_is_dir(ip
)) {
1142 *data_blocks
= DIV_ROUND_UP(len
, sdp
->sd_jbsize
) + 2;
1143 *ind_blocks
= 3 * (sdp
->sd_max_jheight
- 1);
1145 *data_blocks
= (len
>> sdp
->sd_sb
.sb_bsize_shift
) + 3;
1146 *ind_blocks
= 3 * (sdp
->sd_max_height
- 1);
1149 for (tmp
= *data_blocks
; tmp
> sdp
->sd_diptrs
;) {
1150 tmp
= DIV_ROUND_UP(tmp
, sdp
->sd_inptrs
);
1156 * gfs2_write_alloc_required - figure out if a write will require an allocation
1157 * @ip: the file being written to
1158 * @offset: the offset to write to
1159 * @len: the number of bytes being written
1160 * @alloc_required: set to 1 if an alloc is required, 0 otherwise
1165 int gfs2_write_alloc_required(struct gfs2_inode
*ip
, u64 offset
,
1166 unsigned int len
, int *alloc_required
)
1168 struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
1169 struct buffer_head bh
;
1171 u64 lblock
, lblock_stop
, size
;
1173 *alloc_required
= 0;
1178 if (gfs2_is_stuffed(ip
)) {
1180 sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_dinode
))
1181 *alloc_required
= 1;
1185 *alloc_required
= 1;
1186 shift
= sdp
->sd_sb
.sb_bsize_shift
;
1187 if (gfs2_is_dir(ip
)) {
1188 unsigned int bsize
= sdp
->sd_jbsize
;
1190 do_div(lblock
, bsize
);
1191 lblock_stop
= offset
+ len
+ bsize
- 1;
1192 do_div(lblock_stop
, bsize
);
1194 u64 end_of_file
= (ip
->i_di
.di_size
+ sdp
->sd_sb
.sb_bsize
- 1) >> shift
;
1195 lblock
= offset
>> shift
;
1196 lblock_stop
= (offset
+ len
+ sdp
->sd_sb
.sb_bsize
- 1) >> shift
;
1197 if (lblock_stop
> end_of_file
)
1201 size
= (lblock_stop
- lblock
) << shift
;
1205 gfs2_block_map(&ip
->i_inode
, lblock
, &bh
, 0);
1206 if (!buffer_mapped(&bh
))
1209 lblock
+= (bh
.b_size
>> ip
->i_inode
.i_blkbits
);
1212 *alloc_required
= 0;