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/pagemap.h>
15 #include <linux/uio.h>
16 #include <linux/blkdev.h>
18 #include <linux/mount.h>
20 #include <linux/gfs2_ondisk.h>
21 #include <linux/ext2_fs.h>
22 #include <linux/falloc.h>
23 #include <linux/swap.h>
24 #include <linux/crc32.h>
25 #include <linux/writeback.h>
26 #include <asm/uaccess.h>
27 #include <linux/dlm.h>
28 #include <linux/dlm_plock.h>
45 * gfs2_llseek - seek to a location in a file
48 * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
50 * SEEK_END requires the glock for the file because it references the
53 * Returns: The new offset, or errno
56 static loff_t
gfs2_llseek(struct file
*file
, loff_t offset
, int origin
)
58 struct gfs2_inode
*ip
= GFS2_I(file
->f_mapping
->host
);
59 struct gfs2_holder i_gh
;
63 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, LM_FLAG_ANY
,
66 error
= generic_file_llseek_unlocked(file
, offset
, origin
);
67 gfs2_glock_dq_uninit(&i_gh
);
70 error
= generic_file_llseek_unlocked(file
, offset
, origin
);
76 * gfs2_readdir - Read directory entries from a directory
77 * @file: The directory to read from
78 * @dirent: Buffer for dirents
79 * @filldir: Function used to do the copying
84 static int gfs2_readdir(struct file
*file
, void *dirent
, filldir_t filldir
)
86 struct inode
*dir
= file
->f_mapping
->host
;
87 struct gfs2_inode
*dip
= GFS2_I(dir
);
88 struct gfs2_holder d_gh
;
89 u64 offset
= file
->f_pos
;
92 gfs2_holder_init(dip
->i_gl
, LM_ST_SHARED
, 0, &d_gh
);
93 error
= gfs2_glock_nq(&d_gh
);
95 gfs2_holder_uninit(&d_gh
);
99 error
= gfs2_dir_read(dir
, &offset
, dirent
, filldir
);
101 gfs2_glock_dq_uninit(&d_gh
);
103 file
->f_pos
= offset
;
110 * @table: A table of 32 u32 flags
111 * @val: a 32 bit value to convert
113 * This function can be used to convert between fsflags values and
114 * GFS2's own flags values.
116 * Returns: the converted flags
118 static u32
fsflags_cvt(const u32
*table
, u32 val
)
130 static const u32 fsflags_to_gfs2
[32] = {
132 [4] = GFS2_DIF_IMMUTABLE
,
133 [5] = GFS2_DIF_APPENDONLY
,
134 [7] = GFS2_DIF_NOATIME
,
135 [12] = GFS2_DIF_EXHASH
,
136 [14] = GFS2_DIF_INHERIT_JDATA
,
139 static const u32 gfs2_to_fsflags
[32] = {
140 [gfs2fl_Sync
] = FS_SYNC_FL
,
141 [gfs2fl_Immutable
] = FS_IMMUTABLE_FL
,
142 [gfs2fl_AppendOnly
] = FS_APPEND_FL
,
143 [gfs2fl_NoAtime
] = FS_NOATIME_FL
,
144 [gfs2fl_ExHash
] = FS_INDEX_FL
,
145 [gfs2fl_InheritJdata
] = FS_JOURNAL_DATA_FL
,
148 static int gfs2_get_flags(struct file
*filp
, u32 __user
*ptr
)
150 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
151 struct gfs2_inode
*ip
= GFS2_I(inode
);
152 struct gfs2_holder gh
;
156 gfs2_holder_init(ip
->i_gl
, LM_ST_SHARED
, 0, &gh
);
157 error
= gfs2_glock_nq(&gh
);
161 fsflags
= fsflags_cvt(gfs2_to_fsflags
, ip
->i_diskflags
);
162 if (!S_ISDIR(inode
->i_mode
) && ip
->i_diskflags
& GFS2_DIF_JDATA
)
163 fsflags
|= FS_JOURNAL_DATA_FL
;
164 if (put_user(fsflags
, ptr
))
168 gfs2_holder_uninit(&gh
);
172 void gfs2_set_inode_flags(struct inode
*inode
)
174 struct gfs2_inode
*ip
= GFS2_I(inode
);
175 unsigned int flags
= inode
->i_flags
;
177 flags
&= ~(S_SYNC
|S_APPEND
|S_IMMUTABLE
|S_NOATIME
|S_DIRSYNC
);
178 if (ip
->i_diskflags
& GFS2_DIF_IMMUTABLE
)
179 flags
|= S_IMMUTABLE
;
180 if (ip
->i_diskflags
& GFS2_DIF_APPENDONLY
)
182 if (ip
->i_diskflags
& GFS2_DIF_NOATIME
)
184 if (ip
->i_diskflags
& GFS2_DIF_SYNC
)
186 inode
->i_flags
= flags
;
189 /* Flags that can be set by user space */
190 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
191 GFS2_DIF_IMMUTABLE| \
192 GFS2_DIF_APPENDONLY| \
196 GFS2_DIF_INHERIT_JDATA)
199 * gfs2_set_flags - set flags on an inode
201 * @flags: The flags to set
202 * @mask: Indicates which flags are valid
205 static int do_gfs2_set_flags(struct file
*filp
, u32 reqflags
, u32 mask
)
207 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
208 struct gfs2_inode
*ip
= GFS2_I(inode
);
209 struct gfs2_sbd
*sdp
= GFS2_SB(inode
);
210 struct buffer_head
*bh
;
211 struct gfs2_holder gh
;
213 u32 new_flags
, flags
;
215 error
= mnt_want_write(filp
->f_path
.mnt
);
219 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_EXCLUSIVE
, 0, &gh
);
224 if (!is_owner_or_cap(inode
))
228 flags
= ip
->i_diskflags
;
229 new_flags
= (flags
& ~mask
) | (reqflags
& mask
);
230 if ((new_flags
^ flags
) == 0)
234 if ((new_flags
^ flags
) & ~GFS2_FLAGS_USER_SET
)
238 if (IS_IMMUTABLE(inode
) && (new_flags
& GFS2_DIF_IMMUTABLE
))
240 if (IS_APPEND(inode
) && (new_flags
& GFS2_DIF_APPENDONLY
))
242 if (((new_flags
^ flags
) & GFS2_DIF_IMMUTABLE
) &&
243 !capable(CAP_LINUX_IMMUTABLE
))
245 if (!IS_IMMUTABLE(inode
)) {
246 error
= gfs2_permission(inode
, MAY_WRITE
, 0);
250 if ((flags
^ new_flags
) & GFS2_DIF_JDATA
) {
251 if (flags
& GFS2_DIF_JDATA
)
252 gfs2_log_flush(sdp
, ip
->i_gl
);
253 error
= filemap_fdatawrite(inode
->i_mapping
);
256 error
= filemap_fdatawait(inode
->i_mapping
);
260 error
= gfs2_trans_begin(sdp
, RES_DINODE
, 0);
263 error
= gfs2_meta_inode_buffer(ip
, &bh
);
266 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
267 ip
->i_diskflags
= new_flags
;
268 gfs2_dinode_out(ip
, bh
->b_data
);
270 gfs2_set_inode_flags(inode
);
271 gfs2_set_aops(inode
);
275 gfs2_glock_dq_uninit(&gh
);
277 mnt_drop_write(filp
->f_path
.mnt
);
281 static int gfs2_set_flags(struct file
*filp
, u32 __user
*ptr
)
283 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
284 u32 fsflags
, gfsflags
;
286 if (get_user(fsflags
, ptr
))
289 gfsflags
= fsflags_cvt(fsflags_to_gfs2
, fsflags
);
290 if (!S_ISDIR(inode
->i_mode
)) {
291 if (gfsflags
& GFS2_DIF_INHERIT_JDATA
)
292 gfsflags
^= (GFS2_DIF_JDATA
| GFS2_DIF_INHERIT_JDATA
);
293 return do_gfs2_set_flags(filp
, gfsflags
, ~0);
295 return do_gfs2_set_flags(filp
, gfsflags
, ~GFS2_DIF_JDATA
);
298 static long gfs2_ioctl(struct file
*filp
, unsigned int cmd
, unsigned long arg
)
301 case FS_IOC_GETFLAGS
:
302 return gfs2_get_flags(filp
, (u32 __user
*)arg
);
303 case FS_IOC_SETFLAGS
:
304 return gfs2_set_flags(filp
, (u32 __user
*)arg
);
310 * gfs2_allocate_page_backing - Use bmap to allocate blocks
311 * @page: The (locked) page to allocate backing for
313 * We try to allocate all the blocks required for the page in
314 * one go. This might fail for various reasons, so we keep
315 * trying until all the blocks to back this page are allocated.
316 * If some of the blocks are already allocated, thats ok too.
319 static int gfs2_allocate_page_backing(struct page
*page
)
321 struct inode
*inode
= page
->mapping
->host
;
322 struct buffer_head bh
;
323 unsigned long size
= PAGE_CACHE_SIZE
;
324 u64 lblock
= page
->index
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
);
329 gfs2_block_map(inode
, lblock
, &bh
, 1);
330 if (!buffer_mapped(&bh
))
333 lblock
+= (bh
.b_size
>> inode
->i_blkbits
);
339 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
340 * @vma: The virtual memory area
341 * @page: The page which is about to become writable
343 * When the page becomes writable, we need to ensure that we have
344 * blocks allocated on disk to back that page.
347 static int gfs2_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
349 struct page
*page
= vmf
->page
;
350 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
351 struct gfs2_inode
*ip
= GFS2_I(inode
);
352 struct gfs2_sbd
*sdp
= GFS2_SB(inode
);
353 unsigned long last_index
;
354 u64 pos
= page
->index
<< PAGE_CACHE_SHIFT
;
355 unsigned int data_blocks
, ind_blocks
, rblocks
;
356 struct gfs2_holder gh
;
357 struct gfs2_alloc
*al
;
360 gfs2_holder_init(ip
->i_gl
, LM_ST_EXCLUSIVE
, 0, &gh
);
361 ret
= gfs2_glock_nq(&gh
);
365 set_bit(GLF_DIRTY
, &ip
->i_gl
->gl_flags
);
366 set_bit(GIF_SW_PAGED
, &ip
->i_flags
);
368 if (!gfs2_write_alloc_required(ip
, pos
, PAGE_CACHE_SIZE
))
371 al
= gfs2_alloc_get(ip
);
375 ret
= gfs2_quota_lock_check(ip
);
378 gfs2_write_calc_reserv(ip
, PAGE_CACHE_SIZE
, &data_blocks
, &ind_blocks
);
379 al
->al_requested
= data_blocks
+ ind_blocks
;
380 ret
= gfs2_inplace_reserve(ip
);
382 goto out_quota_unlock
;
384 rblocks
= RES_DINODE
+ ind_blocks
;
385 if (gfs2_is_jdata(ip
))
386 rblocks
+= data_blocks
? data_blocks
: 1;
387 if (ind_blocks
|| data_blocks
) {
388 rblocks
+= RES_STATFS
+ RES_QUOTA
;
389 rblocks
+= gfs2_rg_blocks(al
);
391 ret
= gfs2_trans_begin(sdp
, rblocks
, 0);
397 last_index
= ip
->i_inode
.i_size
>> PAGE_CACHE_SHIFT
;
398 if (page
->index
> last_index
)
399 goto out_unlock_page
;
401 if (!PageUptodate(page
) || page
->mapping
!= ip
->i_inode
.i_mapping
)
402 goto out_unlock_page
;
403 if (gfs2_is_stuffed(ip
)) {
404 ret
= gfs2_unstuff_dinode(ip
, page
);
406 goto out_unlock_page
;
408 ret
= gfs2_allocate_page_backing(page
);
414 gfs2_inplace_release(ip
);
416 gfs2_quota_unlock(ip
);
422 gfs2_holder_uninit(&gh
);
426 ret
= VM_FAULT_SIGBUS
;
430 static const struct vm_operations_struct gfs2_vm_ops
= {
431 .fault
= filemap_fault
,
432 .page_mkwrite
= gfs2_page_mkwrite
,
437 * @file: The file to map
438 * @vma: The VMA which described the mapping
440 * There is no need to get a lock here unless we should be updating
441 * atime. We ignore any locking errors since the only consequence is
442 * a missed atime update (which will just be deferred until later).
447 static int gfs2_mmap(struct file
*file
, struct vm_area_struct
*vma
)
449 struct gfs2_inode
*ip
= GFS2_I(file
->f_mapping
->host
);
451 if (!(file
->f_flags
& O_NOATIME
) &&
452 !IS_NOATIME(&ip
->i_inode
)) {
453 struct gfs2_holder i_gh
;
456 gfs2_holder_init(ip
->i_gl
, LM_ST_SHARED
, LM_FLAG_ANY
, &i_gh
);
457 error
= gfs2_glock_nq(&i_gh
);
460 gfs2_glock_dq(&i_gh
);
462 gfs2_holder_uninit(&i_gh
);
466 vma
->vm_ops
= &gfs2_vm_ops
;
467 vma
->vm_flags
|= VM_CAN_NONLINEAR
;
473 * gfs2_open - open a file
474 * @inode: the inode to open
475 * @file: the struct file for this opening
480 static int gfs2_open(struct inode
*inode
, struct file
*file
)
482 struct gfs2_inode
*ip
= GFS2_I(inode
);
483 struct gfs2_holder i_gh
;
484 struct gfs2_file
*fp
;
487 fp
= kzalloc(sizeof(struct gfs2_file
), GFP_KERNEL
);
491 mutex_init(&fp
->f_fl_mutex
);
493 gfs2_assert_warn(GFS2_SB(inode
), !file
->private_data
);
494 file
->private_data
= fp
;
496 if (S_ISREG(ip
->i_inode
.i_mode
)) {
497 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, LM_FLAG_ANY
,
502 if (!(file
->f_flags
& O_LARGEFILE
) &&
503 i_size_read(inode
) > MAX_NON_LFS
) {
508 gfs2_glock_dq_uninit(&i_gh
);
514 gfs2_glock_dq_uninit(&i_gh
);
516 file
->private_data
= NULL
;
522 * gfs2_close - called to close a struct file
523 * @inode: the inode the struct file belongs to
524 * @file: the struct file being closed
529 static int gfs2_close(struct inode
*inode
, struct file
*file
)
531 struct gfs2_sbd
*sdp
= inode
->i_sb
->s_fs_info
;
532 struct gfs2_file
*fp
;
534 fp
= file
->private_data
;
535 file
->private_data
= NULL
;
537 if (gfs2_assert_warn(sdp
, fp
))
546 * gfs2_fsync - sync the dirty data for a file (across the cluster)
547 * @file: the file that points to the dentry (we ignore this)
548 * @dentry: the dentry that points to the inode to sync
550 * The VFS will flush "normal" data for us. We only need to worry
551 * about metadata here. For journaled data, we just do a log flush
552 * as we can't avoid it. Otherwise we can just bale out if datasync
553 * is set. For stuffed inodes we must flush the log in order to
554 * ensure that all data is on disk.
556 * The call to write_inode_now() is there to write back metadata and
557 * the inode itself. It does also try and write the data, but thats
558 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
564 static int gfs2_fsync(struct file
*file
, int datasync
)
566 struct inode
*inode
= file
->f_mapping
->host
;
567 int sync_state
= inode
->i_state
& (I_DIRTY_SYNC
|I_DIRTY_DATASYNC
);
570 if (gfs2_is_jdata(GFS2_I(inode
))) {
571 gfs2_log_flush(GFS2_SB(inode
), GFS2_I(inode
)->i_gl
);
575 if (sync_state
!= 0) {
577 ret
= write_inode_now(inode
, 0);
579 if (gfs2_is_stuffed(GFS2_I(inode
)))
580 gfs2_log_flush(GFS2_SB(inode
), GFS2_I(inode
)->i_gl
);
587 * gfs2_file_aio_write - Perform a write to a file
588 * @iocb: The io context
589 * @iov: The data to write
590 * @nr_segs: Number of @iov segments
591 * @pos: The file position
593 * We have to do a lock/unlock here to refresh the inode size for
594 * O_APPEND writes, otherwise we can land up writing at the wrong
595 * offset. There is still a race, but provided the app is using its
596 * own file locking, this will make O_APPEND work as expected.
600 static ssize_t
gfs2_file_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
601 unsigned long nr_segs
, loff_t pos
)
603 struct file
*file
= iocb
->ki_filp
;
605 if (file
->f_flags
& O_APPEND
) {
606 struct dentry
*dentry
= file
->f_dentry
;
607 struct gfs2_inode
*ip
= GFS2_I(dentry
->d_inode
);
608 struct gfs2_holder gh
;
611 ret
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, 0, &gh
);
614 gfs2_glock_dq_uninit(&gh
);
617 return generic_file_aio_write(iocb
, iov
, nr_segs
, pos
);
620 static void empty_write_end(struct page
*page
, unsigned from
,
623 struct gfs2_inode
*ip
= GFS2_I(page
->mapping
->host
);
625 zero_user(page
, from
, to
-from
);
626 mark_page_accessed(page
);
628 if (!gfs2_is_writeback(ip
))
629 gfs2_page_add_databufs(ip
, page
, from
, to
);
631 block_commit_write(page
, from
, to
);
634 static int needs_empty_write(sector_t block
, struct inode
*inode
)
637 struct buffer_head bh_map
= { .b_state
= 0, .b_blocknr
= 0 };
639 bh_map
.b_size
= 1 << inode
->i_blkbits
;
640 error
= gfs2_block_map(inode
, block
, &bh_map
, 0);
643 return !buffer_mapped(&bh_map
);
646 static int write_empty_blocks(struct page
*page
, unsigned from
, unsigned to
)
648 struct inode
*inode
= page
->mapping
->host
;
649 unsigned start
, end
, next
, blksize
;
650 sector_t block
= page
->index
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
);
653 blksize
= 1 << inode
->i_blkbits
;
655 while (next
< from
) {
662 ret
= needs_empty_write(block
, inode
);
663 if (unlikely(ret
< 0))
667 ret
= __block_write_begin(page
, start
, end
- start
,
671 empty_write_end(page
, start
, end
);
682 ret
= __block_write_begin(page
, start
, end
- start
, gfs2_block_map
);
685 empty_write_end(page
, start
, end
);
691 static int fallocate_chunk(struct inode
*inode
, loff_t offset
, loff_t len
,
694 struct gfs2_inode
*ip
= GFS2_I(inode
);
695 struct buffer_head
*dibh
;
697 u64 start
= offset
>> PAGE_CACHE_SHIFT
;
698 unsigned int start_offset
= offset
& ~PAGE_CACHE_MASK
;
699 u64 end
= (offset
+ len
- 1) >> PAGE_CACHE_SHIFT
;
702 unsigned int end_offset
= (offset
+ len
) & ~PAGE_CACHE_MASK
;
703 unsigned int from
, to
;
706 end_offset
= PAGE_CACHE_SIZE
;
708 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
712 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
714 if (gfs2_is_stuffed(ip
)) {
715 error
= gfs2_unstuff_dinode(ip
, NULL
);
721 offset
= start
<< PAGE_CACHE_SHIFT
;
723 to
= PAGE_CACHE_SIZE
;
724 while (curr
<= end
) {
725 page
= grab_cache_page_write_begin(inode
->i_mapping
, curr
,
727 if (unlikely(!page
)) {
734 error
= write_empty_blocks(page
, from
, to
);
735 if (!error
&& offset
+ to
> inode
->i_size
&&
736 !(mode
& FALLOC_FL_KEEP_SIZE
)) {
737 i_size_write(inode
, offset
+ to
);
740 page_cache_release(page
);
744 offset
+= PAGE_CACHE_SIZE
;
748 gfs2_dinode_out(ip
, dibh
->b_data
);
749 mark_inode_dirty(inode
);
757 static void calc_max_reserv(struct gfs2_inode
*ip
, loff_t max
, loff_t
*len
,
758 unsigned int *data_blocks
, unsigned int *ind_blocks
)
760 const struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
761 unsigned int max_blocks
= ip
->i_alloc
->al_rgd
->rd_free_clone
;
762 unsigned int tmp
, max_data
= max_blocks
- 3 * (sdp
->sd_max_height
- 1);
764 for (tmp
= max_data
; tmp
> sdp
->sd_diptrs
;) {
765 tmp
= DIV_ROUND_UP(tmp
, sdp
->sd_inptrs
);
768 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
769 so it might end up with fewer data blocks */
770 if (max_data
<= *data_blocks
)
772 *data_blocks
= max_data
;
773 *ind_blocks
= max_blocks
- max_data
;
774 *len
= ((loff_t
)max_data
- 3) << sdp
->sd_sb
.sb_bsize_shift
;
777 gfs2_write_calc_reserv(ip
, max
, data_blocks
, ind_blocks
);
781 static long gfs2_fallocate(struct file
*file
, int mode
, loff_t offset
,
784 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
785 struct gfs2_sbd
*sdp
= GFS2_SB(inode
);
786 struct gfs2_inode
*ip
= GFS2_I(inode
);
787 unsigned int data_blocks
= 0, ind_blocks
= 0, rblocks
;
788 loff_t bytes
, max_bytes
;
789 struct gfs2_alloc
*al
;
791 loff_t next
= (offset
+ len
- 1) >> sdp
->sd_sb
.sb_bsize_shift
;
792 next
= (next
+ 1) << sdp
->sd_sb
.sb_bsize_shift
;
794 /* We only support the FALLOC_FL_KEEP_SIZE mode */
795 if (mode
& ~FALLOC_FL_KEEP_SIZE
)
798 offset
= (offset
>> sdp
->sd_sb
.sb_bsize_shift
) <<
799 sdp
->sd_sb
.sb_bsize_shift
;
802 bytes
= sdp
->sd_max_rg_data
* sdp
->sd_sb
.sb_bsize
/ 2;
806 gfs2_holder_init(ip
->i_gl
, LM_ST_EXCLUSIVE
, 0, &ip
->i_gh
);
807 error
= gfs2_glock_nq(&ip
->i_gh
);
811 if (!gfs2_write_alloc_required(ip
, offset
, len
))
817 al
= gfs2_alloc_get(ip
);
823 error
= gfs2_quota_lock_check(ip
);
828 gfs2_write_calc_reserv(ip
, bytes
, &data_blocks
, &ind_blocks
);
830 al
->al_requested
= data_blocks
+ ind_blocks
;
831 error
= gfs2_inplace_reserve(ip
);
833 if (error
== -ENOSPC
&& bytes
> sdp
->sd_sb
.sb_bsize
) {
840 calc_max_reserv(ip
, len
, &max_bytes
, &data_blocks
, &ind_blocks
);
841 al
->al_requested
= data_blocks
+ ind_blocks
;
843 rblocks
= RES_DINODE
+ ind_blocks
+ RES_STATFS
+ RES_QUOTA
+
844 RES_RG_HDR
+ gfs2_rg_blocks(al
);
845 if (gfs2_is_jdata(ip
))
846 rblocks
+= data_blocks
? data_blocks
: 1;
848 error
= gfs2_trans_begin(sdp
, rblocks
,
849 PAGE_CACHE_SIZE
/sdp
->sd_sb
.sb_bsize
);
853 error
= fallocate_chunk(inode
, offset
, max_bytes
, mode
);
861 gfs2_inplace_release(ip
);
862 gfs2_quota_unlock(ip
);
868 gfs2_inplace_release(ip
);
870 gfs2_quota_unlock(ip
);
874 gfs2_glock_dq(&ip
->i_gh
);
876 gfs2_holder_uninit(&ip
->i_gh
);
880 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
883 * gfs2_setlease - acquire/release a file lease
884 * @file: the file pointer
888 * We don't currently have a way to enforce a lease across the whole
889 * cluster; until we do, disable leases (by just returning -EINVAL),
890 * unless the administrator has requested purely local locking.
892 * Locking: called under lock_flocks
897 static int gfs2_setlease(struct file
*file
, long arg
, struct file_lock
**fl
)
903 * gfs2_lock - acquire/release a posix lock on a file
904 * @file: the file pointer
905 * @cmd: either modify or retrieve lock state, possibly wait
906 * @fl: type and range of lock
911 static int gfs2_lock(struct file
*file
, int cmd
, struct file_lock
*fl
)
913 struct gfs2_inode
*ip
= GFS2_I(file
->f_mapping
->host
);
914 struct gfs2_sbd
*sdp
= GFS2_SB(file
->f_mapping
->host
);
915 struct lm_lockstruct
*ls
= &sdp
->sd_lockstruct
;
917 if (!(fl
->fl_flags
& FL_POSIX
))
919 if (__mandatory_lock(&ip
->i_inode
) && fl
->fl_type
!= F_UNLCK
)
922 if (cmd
== F_CANCELLK
) {
925 fl
->fl_type
= F_UNLCK
;
927 if (unlikely(test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
)))
930 return dlm_posix_get(ls
->ls_dlm
, ip
->i_no_addr
, file
, fl
);
931 else if (fl
->fl_type
== F_UNLCK
)
932 return dlm_posix_unlock(ls
->ls_dlm
, ip
->i_no_addr
, file
, fl
);
934 return dlm_posix_lock(ls
->ls_dlm
, ip
->i_no_addr
, file
, cmd
, fl
);
937 static int do_flock(struct file
*file
, int cmd
, struct file_lock
*fl
)
939 struct gfs2_file
*fp
= file
->private_data
;
940 struct gfs2_holder
*fl_gh
= &fp
->f_fl_gh
;
941 struct gfs2_inode
*ip
= GFS2_I(file
->f_path
.dentry
->d_inode
);
942 struct gfs2_glock
*gl
;
947 state
= (fl
->fl_type
== F_WRLCK
) ? LM_ST_EXCLUSIVE
: LM_ST_SHARED
;
948 flags
= (IS_SETLKW(cmd
) ? 0 : LM_FLAG_TRY
) | GL_EXACT
| GL_NOCACHE
;
950 mutex_lock(&fp
->f_fl_mutex
);
954 if (fl_gh
->gh_state
== state
)
956 flock_lock_file_wait(file
,
957 &(struct file_lock
){.fl_type
= F_UNLCK
});
958 gfs2_glock_dq_wait(fl_gh
);
959 gfs2_holder_reinit(state
, flags
, fl_gh
);
961 error
= gfs2_glock_get(GFS2_SB(&ip
->i_inode
), ip
->i_no_addr
,
962 &gfs2_flock_glops
, CREATE
, &gl
);
965 gfs2_holder_init(gl
, state
, flags
, fl_gh
);
968 error
= gfs2_glock_nq(fl_gh
);
970 gfs2_holder_uninit(fl_gh
);
971 if (error
== GLR_TRYFAILED
)
974 error
= flock_lock_file_wait(file
, fl
);
975 gfs2_assert_warn(GFS2_SB(&ip
->i_inode
), !error
);
979 mutex_unlock(&fp
->f_fl_mutex
);
983 static void do_unflock(struct file
*file
, struct file_lock
*fl
)
985 struct gfs2_file
*fp
= file
->private_data
;
986 struct gfs2_holder
*fl_gh
= &fp
->f_fl_gh
;
988 mutex_lock(&fp
->f_fl_mutex
);
989 flock_lock_file_wait(file
, fl
);
991 gfs2_glock_dq_wait(fl_gh
);
992 gfs2_holder_uninit(fl_gh
);
994 mutex_unlock(&fp
->f_fl_mutex
);
998 * gfs2_flock - acquire/release a flock lock on a file
999 * @file: the file pointer
1000 * @cmd: either modify or retrieve lock state, possibly wait
1001 * @fl: type and range of lock
1006 static int gfs2_flock(struct file
*file
, int cmd
, struct file_lock
*fl
)
1008 if (!(fl
->fl_flags
& FL_FLOCK
))
1010 if (fl
->fl_type
& LOCK_MAND
)
1013 if (fl
->fl_type
== F_UNLCK
) {
1014 do_unflock(file
, fl
);
1017 return do_flock(file
, cmd
, fl
);
1021 const struct file_operations gfs2_file_fops
= {
1022 .llseek
= gfs2_llseek
,
1023 .read
= do_sync_read
,
1024 .aio_read
= generic_file_aio_read
,
1025 .write
= do_sync_write
,
1026 .aio_write
= gfs2_file_aio_write
,
1027 .unlocked_ioctl
= gfs2_ioctl
,
1030 .release
= gfs2_close
,
1031 .fsync
= gfs2_fsync
,
1033 .flock
= gfs2_flock
,
1034 .splice_read
= generic_file_splice_read
,
1035 .splice_write
= generic_file_splice_write
,
1036 .setlease
= gfs2_setlease
,
1037 .fallocate
= gfs2_fallocate
,
1040 const struct file_operations gfs2_dir_fops
= {
1041 .readdir
= gfs2_readdir
,
1042 .unlocked_ioctl
= gfs2_ioctl
,
1044 .release
= gfs2_close
,
1045 .fsync
= gfs2_fsync
,
1047 .flock
= gfs2_flock
,
1048 .llseek
= default_llseek
,
1051 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1053 const struct file_operations gfs2_file_fops_nolock
= {
1054 .llseek
= gfs2_llseek
,
1055 .read
= do_sync_read
,
1056 .aio_read
= generic_file_aio_read
,
1057 .write
= do_sync_write
,
1058 .aio_write
= gfs2_file_aio_write
,
1059 .unlocked_ioctl
= gfs2_ioctl
,
1062 .release
= gfs2_close
,
1063 .fsync
= gfs2_fsync
,
1064 .splice_read
= generic_file_splice_read
,
1065 .splice_write
= generic_file_splice_write
,
1066 .setlease
= generic_setlease
,
1067 .fallocate
= gfs2_fallocate
,
1070 const struct file_operations gfs2_dir_fops_nolock
= {
1071 .readdir
= gfs2_readdir
,
1072 .unlocked_ioctl
= gfs2_ioctl
,
1074 .release
= gfs2_close
,
1075 .fsync
= gfs2_fsync
,
1076 .llseek
= default_llseek
,