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/falloc.h>
22 #include <linux/swap.h>
23 #include <linux/crc32.h>
24 #include <linux/writeback.h>
25 #include <asm/uaccess.h>
26 #include <linux/dlm.h>
27 #include <linux/dlm_plock.h>
28 #include <linux/aio.h>
45 * gfs2_llseek - seek to a location in a file
48 * @whence: 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 whence
)
58 struct gfs2_inode
*ip
= GFS2_I(file
->f_mapping
->host
);
59 struct gfs2_holder i_gh
;
63 case SEEK_END
: /* These reference inode->i_size */
66 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, LM_FLAG_ANY
,
69 error
= generic_file_llseek(file
, offset
, whence
);
70 gfs2_glock_dq_uninit(&i_gh
);
75 error
= generic_file_llseek(file
, offset
, whence
);
85 * gfs2_readdir - Iterator for a directory
86 * @file: The directory to read from
87 * @ctx: What to feed directory entries to
92 static int gfs2_readdir(struct file
*file
, struct dir_context
*ctx
)
94 struct inode
*dir
= file
->f_mapping
->host
;
95 struct gfs2_inode
*dip
= GFS2_I(dir
);
96 struct gfs2_holder d_gh
;
99 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
, 0, &d_gh
);
103 error
= gfs2_dir_read(dir
, ctx
, &file
->f_ra
);
105 gfs2_glock_dq_uninit(&d_gh
);
112 * @table: A table of 32 u32 flags
113 * @val: a 32 bit value to convert
115 * This function can be used to convert between fsflags values and
116 * GFS2's own flags values.
118 * Returns: the converted flags
120 static u32
fsflags_cvt(const u32
*table
, u32 val
)
132 static const u32 fsflags_to_gfs2
[32] = {
134 [4] = GFS2_DIF_IMMUTABLE
,
135 [5] = GFS2_DIF_APPENDONLY
,
136 [7] = GFS2_DIF_NOATIME
,
137 [12] = GFS2_DIF_EXHASH
,
138 [14] = GFS2_DIF_INHERIT_JDATA
,
139 [17] = GFS2_DIF_TOPDIR
,
142 static const u32 gfs2_to_fsflags
[32] = {
143 [gfs2fl_Sync
] = FS_SYNC_FL
,
144 [gfs2fl_Immutable
] = FS_IMMUTABLE_FL
,
145 [gfs2fl_AppendOnly
] = FS_APPEND_FL
,
146 [gfs2fl_NoAtime
] = FS_NOATIME_FL
,
147 [gfs2fl_ExHash
] = FS_INDEX_FL
,
148 [gfs2fl_TopLevel
] = FS_TOPDIR_FL
,
149 [gfs2fl_InheritJdata
] = FS_JOURNAL_DATA_FL
,
152 static int gfs2_get_flags(struct file
*filp
, u32 __user
*ptr
)
154 struct inode
*inode
= file_inode(filp
);
155 struct gfs2_inode
*ip
= GFS2_I(inode
);
156 struct gfs2_holder gh
;
160 gfs2_holder_init(ip
->i_gl
, LM_ST_SHARED
, 0, &gh
);
161 error
= gfs2_glock_nq(&gh
);
165 fsflags
= fsflags_cvt(gfs2_to_fsflags
, ip
->i_diskflags
);
166 if (!S_ISDIR(inode
->i_mode
) && ip
->i_diskflags
& GFS2_DIF_JDATA
)
167 fsflags
|= FS_JOURNAL_DATA_FL
;
168 if (put_user(fsflags
, ptr
))
172 gfs2_holder_uninit(&gh
);
176 void gfs2_set_inode_flags(struct inode
*inode
)
178 struct gfs2_inode
*ip
= GFS2_I(inode
);
179 unsigned int flags
= inode
->i_flags
;
181 flags
&= ~(S_SYNC
|S_APPEND
|S_IMMUTABLE
|S_NOATIME
|S_DIRSYNC
|S_NOSEC
);
182 if ((ip
->i_eattr
== 0) && !is_sxid(inode
->i_mode
))
183 inode
->i_flags
|= S_NOSEC
;
184 if (ip
->i_diskflags
& GFS2_DIF_IMMUTABLE
)
185 flags
|= S_IMMUTABLE
;
186 if (ip
->i_diskflags
& GFS2_DIF_APPENDONLY
)
188 if (ip
->i_diskflags
& GFS2_DIF_NOATIME
)
190 if (ip
->i_diskflags
& GFS2_DIF_SYNC
)
192 inode
->i_flags
= flags
;
195 /* Flags that can be set by user space */
196 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
197 GFS2_DIF_IMMUTABLE| \
198 GFS2_DIF_APPENDONLY| \
203 GFS2_DIF_INHERIT_JDATA)
206 * gfs2_set_flags - set flags on an inode
208 * @flags: The flags to set
209 * @mask: Indicates which flags are valid
212 static int do_gfs2_set_flags(struct file
*filp
, u32 reqflags
, u32 mask
)
214 struct inode
*inode
= file_inode(filp
);
215 struct gfs2_inode
*ip
= GFS2_I(inode
);
216 struct gfs2_sbd
*sdp
= GFS2_SB(inode
);
217 struct buffer_head
*bh
;
218 struct gfs2_holder gh
;
220 u32 new_flags
, flags
;
222 error
= mnt_want_write_file(filp
);
226 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_EXCLUSIVE
, 0, &gh
);
231 if (!inode_owner_or_capable(inode
))
235 flags
= ip
->i_diskflags
;
236 new_flags
= (flags
& ~mask
) | (reqflags
& mask
);
237 if ((new_flags
^ flags
) == 0)
241 if ((new_flags
^ flags
) & ~GFS2_FLAGS_USER_SET
)
245 if (IS_IMMUTABLE(inode
) && (new_flags
& GFS2_DIF_IMMUTABLE
))
247 if (IS_APPEND(inode
) && (new_flags
& GFS2_DIF_APPENDONLY
))
249 if (((new_flags
^ flags
) & GFS2_DIF_IMMUTABLE
) &&
250 !capable(CAP_LINUX_IMMUTABLE
))
252 if (!IS_IMMUTABLE(inode
)) {
253 error
= gfs2_permission(inode
, MAY_WRITE
);
257 if ((flags
^ new_flags
) & GFS2_DIF_JDATA
) {
258 if (flags
& GFS2_DIF_JDATA
)
259 gfs2_log_flush(sdp
, ip
->i_gl
);
260 error
= filemap_fdatawrite(inode
->i_mapping
);
263 error
= filemap_fdatawait(inode
->i_mapping
);
267 error
= gfs2_trans_begin(sdp
, RES_DINODE
, 0);
270 error
= gfs2_meta_inode_buffer(ip
, &bh
);
273 gfs2_trans_add_meta(ip
->i_gl
, bh
);
274 ip
->i_diskflags
= new_flags
;
275 gfs2_dinode_out(ip
, bh
->b_data
);
277 gfs2_set_inode_flags(inode
);
278 gfs2_set_aops(inode
);
282 gfs2_glock_dq_uninit(&gh
);
284 mnt_drop_write_file(filp
);
288 static int gfs2_set_flags(struct file
*filp
, u32 __user
*ptr
)
290 struct inode
*inode
= file_inode(filp
);
291 u32 fsflags
, gfsflags
;
293 if (get_user(fsflags
, ptr
))
296 gfsflags
= fsflags_cvt(fsflags_to_gfs2
, fsflags
);
297 if (!S_ISDIR(inode
->i_mode
)) {
298 gfsflags
&= ~GFS2_DIF_TOPDIR
;
299 if (gfsflags
& GFS2_DIF_INHERIT_JDATA
)
300 gfsflags
^= (GFS2_DIF_JDATA
| GFS2_DIF_INHERIT_JDATA
);
301 return do_gfs2_set_flags(filp
, gfsflags
, ~0);
303 return do_gfs2_set_flags(filp
, gfsflags
, ~GFS2_DIF_JDATA
);
306 static long gfs2_ioctl(struct file
*filp
, unsigned int cmd
, unsigned long arg
)
309 case FS_IOC_GETFLAGS
:
310 return gfs2_get_flags(filp
, (u32 __user
*)arg
);
311 case FS_IOC_SETFLAGS
:
312 return gfs2_set_flags(filp
, (u32 __user
*)arg
);
314 return gfs2_fitrim(filp
, (void __user
*)arg
);
320 * gfs2_size_hint - Give a hint to the size of a write request
321 * @file: The struct file
322 * @offset: The file offset of the write
323 * @size: The length of the write
325 * When we are about to do a write, this function records the total
326 * write size in order to provide a suitable hint to the lower layers
327 * about how many blocks will be required.
331 static void gfs2_size_hint(struct file
*filep
, loff_t offset
, size_t size
)
333 struct inode
*inode
= file_inode(filep
);
334 struct gfs2_sbd
*sdp
= GFS2_SB(inode
);
335 struct gfs2_inode
*ip
= GFS2_I(inode
);
336 size_t blks
= (size
+ sdp
->sd_sb
.sb_bsize
- 1) >> sdp
->sd_sb
.sb_bsize_shift
;
337 int hint
= min_t(size_t, INT_MAX
, blks
);
339 atomic_set(&ip
->i_res
->rs_sizehint
, hint
);
343 * gfs2_allocate_page_backing - Use bmap to allocate blocks
344 * @page: The (locked) page to allocate backing for
346 * We try to allocate all the blocks required for the page in
347 * one go. This might fail for various reasons, so we keep
348 * trying until all the blocks to back this page are allocated.
349 * If some of the blocks are already allocated, thats ok too.
352 static int gfs2_allocate_page_backing(struct page
*page
)
354 struct inode
*inode
= page
->mapping
->host
;
355 struct buffer_head bh
;
356 unsigned long size
= PAGE_CACHE_SIZE
;
357 u64 lblock
= page
->index
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
);
362 gfs2_block_map(inode
, lblock
, &bh
, 1);
363 if (!buffer_mapped(&bh
))
366 lblock
+= (bh
.b_size
>> inode
->i_blkbits
);
372 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
373 * @vma: The virtual memory area
374 * @page: The page which is about to become writable
376 * When the page becomes writable, we need to ensure that we have
377 * blocks allocated on disk to back that page.
380 static int gfs2_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
382 struct page
*page
= vmf
->page
;
383 struct inode
*inode
= file_inode(vma
->vm_file
);
384 struct gfs2_inode
*ip
= GFS2_I(inode
);
385 struct gfs2_sbd
*sdp
= GFS2_SB(inode
);
386 unsigned long last_index
;
387 u64 pos
= page
->index
<< PAGE_CACHE_SHIFT
;
388 unsigned int data_blocks
, ind_blocks
, rblocks
;
389 struct gfs2_holder gh
;
393 sb_start_pagefault(inode
->i_sb
);
395 /* Update file times before taking page lock */
396 file_update_time(vma
->vm_file
);
398 ret
= get_write_access(inode
);
402 ret
= gfs2_rs_alloc(ip
);
404 goto out_write_access
;
406 gfs2_size_hint(vma
->vm_file
, pos
, PAGE_CACHE_SIZE
);
408 gfs2_holder_init(ip
->i_gl
, LM_ST_EXCLUSIVE
, 0, &gh
);
409 ret
= gfs2_glock_nq(&gh
);
413 set_bit(GLF_DIRTY
, &ip
->i_gl
->gl_flags
);
414 set_bit(GIF_SW_PAGED
, &ip
->i_flags
);
416 if (!gfs2_write_alloc_required(ip
, pos
, PAGE_CACHE_SIZE
)) {
418 if (!PageUptodate(page
) || page
->mapping
!= inode
->i_mapping
) {
425 ret
= gfs2_rindex_update(sdp
);
429 ret
= gfs2_quota_lock_check(ip
);
432 gfs2_write_calc_reserv(ip
, PAGE_CACHE_SIZE
, &data_blocks
, &ind_blocks
);
433 ret
= gfs2_inplace_reserve(ip
, data_blocks
+ ind_blocks
, 0);
435 goto out_quota_unlock
;
437 rblocks
= RES_DINODE
+ ind_blocks
;
438 if (gfs2_is_jdata(ip
))
439 rblocks
+= data_blocks
? data_blocks
: 1;
440 if (ind_blocks
|| data_blocks
) {
441 rblocks
+= RES_STATFS
+ RES_QUOTA
;
442 rblocks
+= gfs2_rg_blocks(ip
, data_blocks
+ ind_blocks
);
444 ret
= gfs2_trans_begin(sdp
, rblocks
, 0);
450 size
= i_size_read(inode
);
451 last_index
= (size
- 1) >> PAGE_CACHE_SHIFT
;
452 /* Check page index against inode size */
453 if (size
== 0 || (page
->index
> last_index
))
457 /* If truncated, we must retry the operation, we may have raced
458 * with the glock demotion code.
460 if (!PageUptodate(page
) || page
->mapping
!= inode
->i_mapping
)
463 /* Unstuff, if required, and allocate backing blocks for page */
465 if (gfs2_is_stuffed(ip
))
466 ret
= gfs2_unstuff_dinode(ip
, page
);
468 ret
= gfs2_allocate_page_backing(page
);
475 gfs2_inplace_release(ip
);
477 gfs2_quota_unlock(ip
);
481 gfs2_holder_uninit(&gh
);
483 set_page_dirty(page
);
484 wait_for_stable_page(page
);
487 put_write_access(inode
);
489 sb_end_pagefault(inode
->i_sb
);
490 return block_page_mkwrite_return(ret
);
493 static const struct vm_operations_struct gfs2_vm_ops
= {
494 .fault
= filemap_fault
,
495 .page_mkwrite
= gfs2_page_mkwrite
,
496 .remap_pages
= generic_file_remap_pages
,
501 * @file: The file to map
502 * @vma: The VMA which described the mapping
504 * There is no need to get a lock here unless we should be updating
505 * atime. We ignore any locking errors since the only consequence is
506 * a missed atime update (which will just be deferred until later).
511 static int gfs2_mmap(struct file
*file
, struct vm_area_struct
*vma
)
513 struct gfs2_inode
*ip
= GFS2_I(file
->f_mapping
->host
);
515 if (!(file
->f_flags
& O_NOATIME
) &&
516 !IS_NOATIME(&ip
->i_inode
)) {
517 struct gfs2_holder i_gh
;
520 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, LM_FLAG_ANY
,
524 /* grab lock to update inode */
525 gfs2_glock_dq_uninit(&i_gh
);
528 vma
->vm_ops
= &gfs2_vm_ops
;
534 * gfs2_open_common - This is common to open and atomic_open
535 * @inode: The inode being opened
536 * @file: The file being opened
538 * This maybe called under a glock or not depending upon how it has
539 * been called. We must always be called under a glock for regular
540 * files, however. For other file types, it does not matter whether
541 * we hold the glock or not.
543 * Returns: Error code or 0 for success
546 int gfs2_open_common(struct inode
*inode
, struct file
*file
)
548 struct gfs2_file
*fp
;
551 if (S_ISREG(inode
->i_mode
)) {
552 ret
= generic_file_open(inode
, file
);
557 fp
= kzalloc(sizeof(struct gfs2_file
), GFP_NOFS
);
561 mutex_init(&fp
->f_fl_mutex
);
563 gfs2_assert_warn(GFS2_SB(inode
), !file
->private_data
);
564 file
->private_data
= fp
;
569 * gfs2_open - open a file
570 * @inode: the inode to open
571 * @file: the struct file for this opening
573 * After atomic_open, this function is only used for opening files
574 * which are already cached. We must still get the glock for regular
575 * files to ensure that we have the file size uptodate for the large
576 * file check which is in the common code. That is only an issue for
577 * regular files though.
582 static int gfs2_open(struct inode
*inode
, struct file
*file
)
584 struct gfs2_inode
*ip
= GFS2_I(inode
);
585 struct gfs2_holder i_gh
;
587 bool need_unlock
= false;
589 if (S_ISREG(ip
->i_inode
.i_mode
)) {
590 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, LM_FLAG_ANY
,
597 error
= gfs2_open_common(inode
, file
);
600 gfs2_glock_dq_uninit(&i_gh
);
606 * gfs2_release - called to close a struct file
607 * @inode: the inode the struct file belongs to
608 * @file: the struct file being closed
613 static int gfs2_release(struct inode
*inode
, struct file
*file
)
615 struct gfs2_inode
*ip
= GFS2_I(inode
);
617 kfree(file
->private_data
);
618 file
->private_data
= NULL
;
620 if (!(file
->f_mode
& FMODE_WRITE
))
628 * gfs2_fsync - sync the dirty data for a file (across the cluster)
629 * @file: the file that points to the dentry
630 * @start: the start position in the file to sync
631 * @end: the end position in the file to sync
632 * @datasync: set if we can ignore timestamp changes
634 * We split the data flushing here so that we don't wait for the data
635 * until after we've also sent the metadata to disk. Note that for
636 * data=ordered, we will write & wait for the data at the log flush
637 * stage anyway, so this is unlikely to make much of a difference
638 * except in the data=writeback case.
640 * If the fdatawrite fails due to any reason except -EIO, we will
641 * continue the remainder of the fsync, although we'll still report
642 * the error at the end. This is to match filemap_write_and_wait_range()
648 static int gfs2_fsync(struct file
*file
, loff_t start
, loff_t end
,
651 struct address_space
*mapping
= file
->f_mapping
;
652 struct inode
*inode
= mapping
->host
;
653 int sync_state
= inode
->i_state
& (I_DIRTY_SYNC
|I_DIRTY_DATASYNC
);
654 struct gfs2_inode
*ip
= GFS2_I(inode
);
655 int ret
= 0, ret1
= 0;
657 if (mapping
->nrpages
) {
658 ret1
= filemap_fdatawrite_range(mapping
, start
, end
);
664 sync_state
&= ~I_DIRTY_SYNC
;
667 ret
= sync_inode_metadata(inode
, 1);
670 if (gfs2_is_jdata(ip
))
671 filemap_write_and_wait(mapping
);
672 gfs2_ail_flush(ip
->i_gl
, 1);
675 if (mapping
->nrpages
)
676 ret
= filemap_fdatawait_range(mapping
, start
, end
);
678 return ret
? ret
: ret1
;
682 * gfs2_file_aio_write - Perform a write to a file
683 * @iocb: The io context
684 * @iov: The data to write
685 * @nr_segs: Number of @iov segments
686 * @pos: The file position
688 * We have to do a lock/unlock here to refresh the inode size for
689 * O_APPEND writes, otherwise we can land up writing at the wrong
690 * offset. There is still a race, but provided the app is using its
691 * own file locking, this will make O_APPEND work as expected.
695 static ssize_t
gfs2_file_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
696 unsigned long nr_segs
, loff_t pos
)
698 struct file
*file
= iocb
->ki_filp
;
699 size_t writesize
= iov_length(iov
, nr_segs
);
700 struct gfs2_inode
*ip
= GFS2_I(file_inode(file
));
703 ret
= gfs2_rs_alloc(ip
);
707 gfs2_size_hint(file
, pos
, writesize
);
709 if (file
->f_flags
& O_APPEND
) {
710 struct gfs2_holder gh
;
712 ret
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, 0, &gh
);
715 gfs2_glock_dq_uninit(&gh
);
718 return generic_file_aio_write(iocb
, iov
, nr_segs
, pos
);
721 static int fallocate_chunk(struct inode
*inode
, loff_t offset
, loff_t len
,
724 struct gfs2_inode
*ip
= GFS2_I(inode
);
725 struct buffer_head
*dibh
;
728 unsigned int nr_blks
;
729 sector_t lblock
= offset
>> inode
->i_blkbits
;
731 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
735 gfs2_trans_add_meta(ip
->i_gl
, dibh
);
737 if (gfs2_is_stuffed(ip
)) {
738 error
= gfs2_unstuff_dinode(ip
, NULL
);
744 struct buffer_head bh_map
= { .b_state
= 0, .b_blocknr
= 0 };
746 set_buffer_zeronew(&bh_map
);
748 error
= gfs2_block_map(inode
, lblock
, &bh_map
, 1);
751 len
-= bh_map
.b_size
;
752 nr_blks
= bh_map
.b_size
>> inode
->i_blkbits
;
754 if (!buffer_new(&bh_map
))
756 if (unlikely(!buffer_zeronew(&bh_map
))) {
761 if (offset
+ size
> inode
->i_size
&& !(mode
& FALLOC_FL_KEEP_SIZE
))
762 i_size_write(inode
, offset
+ size
);
764 mark_inode_dirty(inode
);
771 static void calc_max_reserv(struct gfs2_inode
*ip
, loff_t max
, loff_t
*len
,
772 unsigned int *data_blocks
, unsigned int *ind_blocks
)
774 const struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
775 unsigned int max_blocks
= ip
->i_rgd
->rd_free_clone
;
776 unsigned int tmp
, max_data
= max_blocks
- 3 * (sdp
->sd_max_height
- 1);
778 for (tmp
= max_data
; tmp
> sdp
->sd_diptrs
;) {
779 tmp
= DIV_ROUND_UP(tmp
, sdp
->sd_inptrs
);
782 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
783 so it might end up with fewer data blocks */
784 if (max_data
<= *data_blocks
)
786 *data_blocks
= max_data
;
787 *ind_blocks
= max_blocks
- max_data
;
788 *len
= ((loff_t
)max_data
- 3) << sdp
->sd_sb
.sb_bsize_shift
;
791 gfs2_write_calc_reserv(ip
, max
, data_blocks
, ind_blocks
);
795 static long gfs2_fallocate(struct file
*file
, int mode
, loff_t offset
,
798 struct inode
*inode
= file_inode(file
);
799 struct gfs2_sbd
*sdp
= GFS2_SB(inode
);
800 struct gfs2_inode
*ip
= GFS2_I(inode
);
801 unsigned int data_blocks
= 0, ind_blocks
= 0, rblocks
;
802 loff_t bytes
, max_bytes
;
804 const loff_t pos
= offset
;
805 const loff_t count
= len
;
806 loff_t bsize_mask
= ~((loff_t
)sdp
->sd_sb
.sb_bsize
- 1);
807 loff_t next
= (offset
+ len
- 1) >> sdp
->sd_sb
.sb_bsize_shift
;
808 loff_t max_chunk_size
= UINT_MAX
& bsize_mask
;
809 next
= (next
+ 1) << sdp
->sd_sb
.sb_bsize_shift
;
811 /* We only support the FALLOC_FL_KEEP_SIZE mode */
812 if (mode
& ~FALLOC_FL_KEEP_SIZE
)
815 offset
&= bsize_mask
;
818 bytes
= sdp
->sd_max_rg_data
* sdp
->sd_sb
.sb_bsize
/ 2;
823 bytes
= sdp
->sd_sb
.sb_bsize
;
825 error
= gfs2_rs_alloc(ip
);
829 gfs2_holder_init(ip
->i_gl
, LM_ST_EXCLUSIVE
, 0, &ip
->i_gh
);
830 error
= gfs2_glock_nq(&ip
->i_gh
);
834 gfs2_size_hint(file
, offset
, len
);
839 if (!gfs2_write_alloc_required(ip
, offset
, bytes
)) {
844 error
= gfs2_quota_lock_check(ip
);
849 gfs2_write_calc_reserv(ip
, bytes
, &data_blocks
, &ind_blocks
);
851 error
= gfs2_inplace_reserve(ip
, data_blocks
+ ind_blocks
, 0);
853 if (error
== -ENOSPC
&& bytes
> sdp
->sd_sb
.sb_bsize
) {
857 bytes
= sdp
->sd_sb
.sb_bsize
;
863 calc_max_reserv(ip
, (len
> max_chunk_size
)? max_chunk_size
: len
,
864 &max_bytes
, &data_blocks
, &ind_blocks
);
866 rblocks
= RES_DINODE
+ ind_blocks
+ RES_STATFS
+ RES_QUOTA
+
867 RES_RG_HDR
+ gfs2_rg_blocks(ip
, data_blocks
+ ind_blocks
);
868 if (gfs2_is_jdata(ip
))
869 rblocks
+= data_blocks
? data_blocks
: 1;
871 error
= gfs2_trans_begin(sdp
, rblocks
,
872 PAGE_CACHE_SIZE
/sdp
->sd_sb
.sb_bsize
);
876 error
= fallocate_chunk(inode
, offset
, max_bytes
, mode
);
884 gfs2_inplace_release(ip
);
885 gfs2_quota_unlock(ip
);
889 error
= generic_write_sync(file
, pos
, count
);
893 gfs2_inplace_release(ip
);
895 gfs2_quota_unlock(ip
);
897 gfs2_glock_dq(&ip
->i_gh
);
899 gfs2_holder_uninit(&ip
->i_gh
);
903 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
906 * gfs2_setlease - acquire/release a file lease
907 * @file: the file pointer
911 * We don't currently have a way to enforce a lease across the whole
912 * cluster; until we do, disable leases (by just returning -EINVAL),
913 * unless the administrator has requested purely local locking.
915 * Locking: called under i_lock
920 static int gfs2_setlease(struct file
*file
, long arg
, struct file_lock
**fl
)
926 * gfs2_lock - acquire/release a posix lock on a file
927 * @file: the file pointer
928 * @cmd: either modify or retrieve lock state, possibly wait
929 * @fl: type and range of lock
934 static int gfs2_lock(struct file
*file
, int cmd
, struct file_lock
*fl
)
936 struct gfs2_inode
*ip
= GFS2_I(file
->f_mapping
->host
);
937 struct gfs2_sbd
*sdp
= GFS2_SB(file
->f_mapping
->host
);
938 struct lm_lockstruct
*ls
= &sdp
->sd_lockstruct
;
940 if (!(fl
->fl_flags
& FL_POSIX
))
942 if (__mandatory_lock(&ip
->i_inode
) && fl
->fl_type
!= F_UNLCK
)
945 if (cmd
== F_CANCELLK
) {
948 fl
->fl_type
= F_UNLCK
;
950 if (unlikely(test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
))) {
951 if (fl
->fl_type
== F_UNLCK
)
952 posix_lock_file_wait(file
, fl
);
956 return dlm_posix_get(ls
->ls_dlm
, ip
->i_no_addr
, file
, fl
);
957 else if (fl
->fl_type
== F_UNLCK
)
958 return dlm_posix_unlock(ls
->ls_dlm
, ip
->i_no_addr
, file
, fl
);
960 return dlm_posix_lock(ls
->ls_dlm
, ip
->i_no_addr
, file
, cmd
, fl
);
963 static int do_flock(struct file
*file
, int cmd
, struct file_lock
*fl
)
965 struct gfs2_file
*fp
= file
->private_data
;
966 struct gfs2_holder
*fl_gh
= &fp
->f_fl_gh
;
967 struct gfs2_inode
*ip
= GFS2_I(file_inode(file
));
968 struct gfs2_glock
*gl
;
973 state
= (fl
->fl_type
== F_WRLCK
) ? LM_ST_EXCLUSIVE
: LM_ST_SHARED
;
974 flags
= (IS_SETLKW(cmd
) ? 0 : LM_FLAG_TRY
) | GL_EXACT
| GL_NOCACHE
;
976 mutex_lock(&fp
->f_fl_mutex
);
980 if (fl_gh
->gh_state
== state
)
982 flock_lock_file_wait(file
,
983 &(struct file_lock
){.fl_type
= F_UNLCK
});
984 gfs2_glock_dq_wait(fl_gh
);
985 gfs2_holder_reinit(state
, flags
, fl_gh
);
987 error
= gfs2_glock_get(GFS2_SB(&ip
->i_inode
), ip
->i_no_addr
,
988 &gfs2_flock_glops
, CREATE
, &gl
);
991 gfs2_holder_init(gl
, state
, flags
, fl_gh
);
994 error
= gfs2_glock_nq(fl_gh
);
996 gfs2_holder_uninit(fl_gh
);
997 if (error
== GLR_TRYFAILED
)
1000 error
= flock_lock_file_wait(file
, fl
);
1001 gfs2_assert_warn(GFS2_SB(&ip
->i_inode
), !error
);
1005 mutex_unlock(&fp
->f_fl_mutex
);
1009 static void do_unflock(struct file
*file
, struct file_lock
*fl
)
1011 struct gfs2_file
*fp
= file
->private_data
;
1012 struct gfs2_holder
*fl_gh
= &fp
->f_fl_gh
;
1014 mutex_lock(&fp
->f_fl_mutex
);
1015 flock_lock_file_wait(file
, fl
);
1017 gfs2_glock_dq_wait(fl_gh
);
1018 gfs2_holder_uninit(fl_gh
);
1020 mutex_unlock(&fp
->f_fl_mutex
);
1024 * gfs2_flock - acquire/release a flock lock on a file
1025 * @file: the file pointer
1026 * @cmd: either modify or retrieve lock state, possibly wait
1027 * @fl: type and range of lock
1032 static int gfs2_flock(struct file
*file
, int cmd
, struct file_lock
*fl
)
1034 if (!(fl
->fl_flags
& FL_FLOCK
))
1036 if (fl
->fl_type
& LOCK_MAND
)
1039 if (fl
->fl_type
== F_UNLCK
) {
1040 do_unflock(file
, fl
);
1043 return do_flock(file
, cmd
, fl
);
1047 const struct file_operations gfs2_file_fops
= {
1048 .llseek
= gfs2_llseek
,
1049 .read
= do_sync_read
,
1050 .aio_read
= generic_file_aio_read
,
1051 .write
= do_sync_write
,
1052 .aio_write
= gfs2_file_aio_write
,
1053 .unlocked_ioctl
= gfs2_ioctl
,
1056 .release
= gfs2_release
,
1057 .fsync
= gfs2_fsync
,
1059 .flock
= gfs2_flock
,
1060 .splice_read
= generic_file_splice_read
,
1061 .splice_write
= generic_file_splice_write
,
1062 .setlease
= gfs2_setlease
,
1063 .fallocate
= gfs2_fallocate
,
1066 const struct file_operations gfs2_dir_fops
= {
1067 .iterate
= gfs2_readdir
,
1068 .unlocked_ioctl
= gfs2_ioctl
,
1070 .release
= gfs2_release
,
1071 .fsync
= gfs2_fsync
,
1073 .flock
= gfs2_flock
,
1074 .llseek
= default_llseek
,
1077 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1079 const struct file_operations gfs2_file_fops_nolock
= {
1080 .llseek
= gfs2_llseek
,
1081 .read
= do_sync_read
,
1082 .aio_read
= generic_file_aio_read
,
1083 .write
= do_sync_write
,
1084 .aio_write
= gfs2_file_aio_write
,
1085 .unlocked_ioctl
= gfs2_ioctl
,
1088 .release
= gfs2_release
,
1089 .fsync
= gfs2_fsync
,
1090 .splice_read
= generic_file_splice_read
,
1091 .splice_write
= generic_file_splice_write
,
1092 .setlease
= generic_setlease
,
1093 .fallocate
= gfs2_fallocate
,
1096 const struct file_operations gfs2_dir_fops_nolock
= {
1097 .iterate
= gfs2_readdir
,
1098 .unlocked_ioctl
= gfs2_ioctl
,
1100 .release
= gfs2_release
,
1101 .fsync
= gfs2_fsync
,
1102 .llseek
= default_llseek
,