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 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, origin);
70 gfs2_glock_dq_uninit(&i_gh);
75 error = generic_file_llseek(file, offset, origin);
85 * gfs2_readdir - Read directory entries from a directory
86 * @file: The directory to read from
87 * @dirent: Buffer for dirents
88 * @filldir: Function used to do the copying
93 static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
95 struct inode *dir = file->f_mapping->host;
96 struct gfs2_inode *dip = GFS2_I(dir);
97 struct gfs2_holder d_gh;
98 u64 offset = file->f_pos;
101 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
102 error = gfs2_glock_nq(&d_gh);
104 gfs2_holder_uninit(&d_gh);
108 error = gfs2_dir_read(dir, &offset, dirent, filldir, &file->f_ra);
110 gfs2_glock_dq_uninit(&d_gh);
112 file->f_pos = offset;
119 * @table: A table of 32 u32 flags
120 * @val: a 32 bit value to convert
122 * This function can be used to convert between fsflags values and
123 * GFS2's own flags values.
125 * Returns: the converted flags
127 static u32 fsflags_cvt(const u32 *table, u32 val)
139 static const u32 fsflags_to_gfs2[32] = {
141 [4] = GFS2_DIF_IMMUTABLE,
142 [5] = GFS2_DIF_APPENDONLY,
143 [7] = GFS2_DIF_NOATIME,
144 [12] = GFS2_DIF_EXHASH,
145 [14] = GFS2_DIF_INHERIT_JDATA,
148 static const u32 gfs2_to_fsflags[32] = {
149 [gfs2fl_Sync] = FS_SYNC_FL,
150 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
151 [gfs2fl_AppendOnly] = FS_APPEND_FL,
152 [gfs2fl_NoAtime] = FS_NOATIME_FL,
153 [gfs2fl_ExHash] = FS_INDEX_FL,
154 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
157 static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
159 struct inode *inode = filp->f_path.dentry->d_inode;
160 struct gfs2_inode *ip = GFS2_I(inode);
161 struct gfs2_holder gh;
165 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
166 error = gfs2_glock_nq(&gh);
170 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
171 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
172 fsflags |= FS_JOURNAL_DATA_FL;
173 if (put_user(fsflags, ptr))
177 gfs2_holder_uninit(&gh);
181 void gfs2_set_inode_flags(struct inode *inode)
183 struct gfs2_inode *ip = GFS2_I(inode);
184 unsigned int flags = inode->i_flags;
186 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
187 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
188 inode->i_flags |= S_NOSEC;
189 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
190 flags |= S_IMMUTABLE;
191 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
193 if (ip->i_diskflags & GFS2_DIF_NOATIME)
195 if (ip->i_diskflags & GFS2_DIF_SYNC)
197 inode->i_flags = flags;
200 /* Flags that can be set by user space */
201 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
202 GFS2_DIF_IMMUTABLE| \
203 GFS2_DIF_APPENDONLY| \
207 GFS2_DIF_INHERIT_JDATA)
210 * gfs2_set_flags - set flags on an inode
212 * @flags: The flags to set
213 * @mask: Indicates which flags are valid
216 static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
218 struct inode *inode = filp->f_path.dentry->d_inode;
219 struct gfs2_inode *ip = GFS2_I(inode);
220 struct gfs2_sbd *sdp = GFS2_SB(inode);
221 struct buffer_head *bh;
222 struct gfs2_holder gh;
224 u32 new_flags, flags;
226 error = mnt_want_write_file(filp);
230 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
235 if (!inode_owner_or_capable(inode))
239 flags = ip->i_diskflags;
240 new_flags = (flags & ~mask) | (reqflags & mask);
241 if ((new_flags ^ flags) == 0)
245 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
249 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
251 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
253 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
254 !capable(CAP_LINUX_IMMUTABLE))
256 if (!IS_IMMUTABLE(inode)) {
257 error = gfs2_permission(inode, MAY_WRITE);
261 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
262 if (flags & GFS2_DIF_JDATA)
263 gfs2_log_flush(sdp, ip->i_gl);
264 error = filemap_fdatawrite(inode->i_mapping);
267 error = filemap_fdatawait(inode->i_mapping);
271 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
274 error = gfs2_meta_inode_buffer(ip, &bh);
277 gfs2_trans_add_bh(ip->i_gl, bh, 1);
278 ip->i_diskflags = new_flags;
279 gfs2_dinode_out(ip, bh->b_data);
281 gfs2_set_inode_flags(inode);
282 gfs2_set_aops(inode);
286 gfs2_glock_dq_uninit(&gh);
288 mnt_drop_write_file(filp);
292 static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
294 struct inode *inode = filp->f_path.dentry->d_inode;
295 u32 fsflags, gfsflags;
297 if (get_user(fsflags, ptr))
300 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
301 if (!S_ISDIR(inode->i_mode)) {
302 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
303 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
304 return do_gfs2_set_flags(filp, gfsflags, ~0);
306 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
309 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
312 case FS_IOC_GETFLAGS:
313 return gfs2_get_flags(filp, (u32 __user *)arg);
314 case FS_IOC_SETFLAGS:
315 return gfs2_set_flags(filp, (u32 __user *)arg);
321 * gfs2_allocate_page_backing - Use bmap to allocate blocks
322 * @page: The (locked) page to allocate backing for
324 * We try to allocate all the blocks required for the page in
325 * one go. This might fail for various reasons, so we keep
326 * trying until all the blocks to back this page are allocated.
327 * If some of the blocks are already allocated, thats ok too.
330 static int gfs2_allocate_page_backing(struct page *page)
332 struct inode *inode = page->mapping->host;
333 struct buffer_head bh;
334 unsigned long size = PAGE_CACHE_SIZE;
335 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
340 gfs2_block_map(inode, lblock, &bh, 1);
341 if (!buffer_mapped(&bh))
344 lblock += (bh.b_size >> inode->i_blkbits);
350 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
351 * @vma: The virtual memory area
352 * @page: The page which is about to become writable
354 * When the page becomes writable, we need to ensure that we have
355 * blocks allocated on disk to back that page.
358 static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
360 struct page *page = vmf->page;
361 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
362 struct gfs2_inode *ip = GFS2_I(inode);
363 struct gfs2_sbd *sdp = GFS2_SB(inode);
364 unsigned long last_index;
365 u64 pos = page->index << PAGE_CACHE_SHIFT;
366 unsigned int data_blocks, ind_blocks, rblocks;
367 struct gfs2_holder gh;
368 struct gfs2_qadata *qa;
372 /* Wait if fs is frozen. This is racy so we check again later on
373 * and retry if the fs has been frozen after the page lock has
376 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
378 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
379 ret = gfs2_glock_nq(&gh);
383 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
384 set_bit(GIF_SW_PAGED, &ip->i_flags);
386 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) {
388 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
396 qa = gfs2_qadata_get(ip);
400 ret = gfs2_quota_lock_check(ip);
403 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
404 ret = gfs2_inplace_reserve(ip, data_blocks + ind_blocks);
406 goto out_quota_unlock;
408 rblocks = RES_DINODE + ind_blocks;
409 if (gfs2_is_jdata(ip))
410 rblocks += data_blocks ? data_blocks : 1;
411 if (ind_blocks || data_blocks) {
412 rblocks += RES_STATFS + RES_QUOTA;
413 rblocks += gfs2_rg_blocks(ip);
415 ret = gfs2_trans_begin(sdp, rblocks, 0);
421 size = i_size_read(inode);
422 last_index = (size - 1) >> PAGE_CACHE_SHIFT;
423 /* Check page index against inode size */
424 if (size == 0 || (page->index > last_index))
428 /* If truncated, we must retry the operation, we may have raced
429 * with the glock demotion code.
431 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
434 /* Unstuff, if required, and allocate backing blocks for page */
436 if (gfs2_is_stuffed(ip))
437 ret = gfs2_unstuff_dinode(ip, page);
439 ret = gfs2_allocate_page_backing(page);
446 gfs2_inplace_release(ip);
448 gfs2_quota_unlock(ip);
454 gfs2_holder_uninit(&gh);
456 set_page_dirty(page);
457 /* This check must be post dropping of transaction lock */
458 if (inode->i_sb->s_frozen == SB_UNFROZEN) {
459 wait_on_page_writeback(page);
465 return block_page_mkwrite_return(ret);
468 static const struct vm_operations_struct gfs2_vm_ops = {
469 .fault = filemap_fault,
470 .page_mkwrite = gfs2_page_mkwrite,
475 * @file: The file to map
476 * @vma: The VMA which described the mapping
478 * There is no need to get a lock here unless we should be updating
479 * atime. We ignore any locking errors since the only consequence is
480 * a missed atime update (which will just be deferred until later).
485 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
487 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
489 if (!(file->f_flags & O_NOATIME) &&
490 !IS_NOATIME(&ip->i_inode)) {
491 struct gfs2_holder i_gh;
494 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
495 error = gfs2_glock_nq(&i_gh);
498 gfs2_glock_dq(&i_gh);
500 gfs2_holder_uninit(&i_gh);
504 vma->vm_ops = &gfs2_vm_ops;
505 vma->vm_flags |= VM_CAN_NONLINEAR;
511 * gfs2_open - open a file
512 * @inode: the inode to open
513 * @file: the struct file for this opening
518 static int gfs2_open(struct inode *inode, struct file *file)
520 struct gfs2_inode *ip = GFS2_I(inode);
521 struct gfs2_holder i_gh;
522 struct gfs2_file *fp;
525 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
529 mutex_init(&fp->f_fl_mutex);
531 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
532 file->private_data = fp;
534 if (S_ISREG(ip->i_inode.i_mode)) {
535 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
540 if (!(file->f_flags & O_LARGEFILE) &&
541 i_size_read(inode) > MAX_NON_LFS) {
546 gfs2_glock_dq_uninit(&i_gh);
552 gfs2_glock_dq_uninit(&i_gh);
554 file->private_data = NULL;
560 * gfs2_close - called to close a struct file
561 * @inode: the inode the struct file belongs to
562 * @file: the struct file being closed
567 static int gfs2_close(struct inode *inode, struct file *file)
569 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
570 struct gfs2_file *fp;
572 fp = file->private_data;
573 file->private_data = NULL;
575 if (gfs2_assert_warn(sdp, fp))
584 * gfs2_fsync - sync the dirty data for a file (across the cluster)
585 * @file: the file that points to the dentry
586 * @start: the start position in the file to sync
587 * @end: the end position in the file to sync
588 * @datasync: set if we can ignore timestamp changes
590 * We split the data flushing here so that we don't wait for the data
591 * until after we've also sent the metadata to disk. Note that for
592 * data=ordered, we will write & wait for the data at the log flush
593 * stage anyway, so this is unlikely to make much of a difference
594 * except in the data=writeback case.
596 * If the fdatawrite fails due to any reason except -EIO, we will
597 * continue the remainder of the fsync, although we'll still report
598 * the error at the end. This is to match filemap_write_and_wait_range()
604 static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
607 struct address_space *mapping = file->f_mapping;
608 struct inode *inode = mapping->host;
609 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
610 struct gfs2_inode *ip = GFS2_I(inode);
611 int ret = 0, ret1 = 0;
613 if (mapping->nrpages) {
614 ret1 = filemap_fdatawrite_range(mapping, start, end);
620 sync_state &= ~I_DIRTY_SYNC;
623 ret = sync_inode_metadata(inode, 1);
626 if (gfs2_is_jdata(ip))
627 filemap_write_and_wait(mapping);
628 gfs2_ail_flush(ip->i_gl, 1);
631 if (mapping->nrpages)
632 ret = filemap_fdatawait_range(mapping, start, end);
634 return ret ? ret : ret1;
638 * gfs2_file_aio_write - Perform a write to a file
639 * @iocb: The io context
640 * @iov: The data to write
641 * @nr_segs: Number of @iov segments
642 * @pos: The file position
644 * We have to do a lock/unlock here to refresh the inode size for
645 * O_APPEND writes, otherwise we can land up writing at the wrong
646 * offset. There is still a race, but provided the app is using its
647 * own file locking, this will make O_APPEND work as expected.
651 static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
652 unsigned long nr_segs, loff_t pos)
654 struct file *file = iocb->ki_filp;
656 if (file->f_flags & O_APPEND) {
657 struct dentry *dentry = file->f_dentry;
658 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
659 struct gfs2_holder gh;
662 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
665 gfs2_glock_dq_uninit(&gh);
668 return generic_file_aio_write(iocb, iov, nr_segs, pos);
671 static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
674 struct gfs2_inode *ip = GFS2_I(inode);
675 struct buffer_head *dibh;
677 unsigned int nr_blks;
678 sector_t lblock = offset >> inode->i_blkbits;
680 error = gfs2_meta_inode_buffer(ip, &dibh);
684 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
686 if (gfs2_is_stuffed(ip)) {
687 error = gfs2_unstuff_dinode(ip, NULL);
693 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
695 set_buffer_zeronew(&bh_map);
697 error = gfs2_block_map(inode, lblock, &bh_map, 1);
700 len -= bh_map.b_size;
701 nr_blks = bh_map.b_size >> inode->i_blkbits;
703 if (!buffer_new(&bh_map))
705 if (unlikely(!buffer_zeronew(&bh_map))) {
710 if (offset + len > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE))
711 i_size_write(inode, offset + len);
713 mark_inode_dirty(inode);
720 static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
721 unsigned int *data_blocks, unsigned int *ind_blocks)
723 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
724 unsigned int max_blocks = ip->i_rgd->rd_free_clone;
725 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
727 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
728 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
731 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
732 so it might end up with fewer data blocks */
733 if (max_data <= *data_blocks)
735 *data_blocks = max_data;
736 *ind_blocks = max_blocks - max_data;
737 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
740 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
744 static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
747 struct inode *inode = file->f_path.dentry->d_inode;
748 struct gfs2_sbd *sdp = GFS2_SB(inode);
749 struct gfs2_inode *ip = GFS2_I(inode);
750 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
751 loff_t bytes, max_bytes;
752 struct gfs2_qadata *qa;
754 const loff_t pos = offset;
755 const loff_t count = len;
756 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
757 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
758 loff_t max_chunk_size = UINT_MAX & bsize_mask;
759 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
761 /* We only support the FALLOC_FL_KEEP_SIZE mode */
762 if (mode & ~FALLOC_FL_KEEP_SIZE)
765 offset &= bsize_mask;
768 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
773 bytes = sdp->sd_sb.sb_bsize;
775 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
776 error = gfs2_glock_nq(&ip->i_gh);
780 if (!gfs2_write_alloc_required(ip, offset, len))
786 qa = gfs2_qadata_get(ip);
792 error = gfs2_quota_lock_check(ip);
797 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
799 error = gfs2_inplace_reserve(ip, data_blocks + ind_blocks);
801 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
805 bytes = sdp->sd_sb.sb_bsize;
811 calc_max_reserv(ip, (len > max_chunk_size)? max_chunk_size: len,
812 &max_bytes, &data_blocks, &ind_blocks);
814 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
815 RES_RG_HDR + gfs2_rg_blocks(ip);
816 if (gfs2_is_jdata(ip))
817 rblocks += data_blocks ? data_blocks : 1;
819 error = gfs2_trans_begin(sdp, rblocks,
820 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
824 error = fallocate_chunk(inode, offset, max_bytes, mode);
832 gfs2_inplace_release(ip);
833 gfs2_quota_unlock(ip);
838 error = generic_write_sync(file, pos, count);
842 gfs2_inplace_release(ip);
844 gfs2_quota_unlock(ip);
848 gfs2_glock_dq(&ip->i_gh);
850 gfs2_holder_uninit(&ip->i_gh);
854 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
857 * gfs2_setlease - acquire/release a file lease
858 * @file: the file pointer
862 * We don't currently have a way to enforce a lease across the whole
863 * cluster; until we do, disable leases (by just returning -EINVAL),
864 * unless the administrator has requested purely local locking.
866 * Locking: called under lock_flocks
871 static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
877 * gfs2_lock - acquire/release a posix lock on a file
878 * @file: the file pointer
879 * @cmd: either modify or retrieve lock state, possibly wait
880 * @fl: type and range of lock
885 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
887 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
888 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
889 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
891 if (!(fl->fl_flags & FL_POSIX))
893 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
896 if (cmd == F_CANCELLK) {
899 fl->fl_type = F_UNLCK;
901 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
904 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
905 else if (fl->fl_type == F_UNLCK)
906 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
908 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
911 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
913 struct gfs2_file *fp = file->private_data;
914 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
915 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
916 struct gfs2_glock *gl;
921 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
922 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
924 mutex_lock(&fp->f_fl_mutex);
928 if (fl_gh->gh_state == state)
930 flock_lock_file_wait(file,
931 &(struct file_lock){.fl_type = F_UNLCK});
932 gfs2_glock_dq_wait(fl_gh);
933 gfs2_holder_reinit(state, flags, fl_gh);
935 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
936 &gfs2_flock_glops, CREATE, &gl);
939 gfs2_holder_init(gl, state, flags, fl_gh);
942 error = gfs2_glock_nq(fl_gh);
944 gfs2_holder_uninit(fl_gh);
945 if (error == GLR_TRYFAILED)
948 error = flock_lock_file_wait(file, fl);
949 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
953 mutex_unlock(&fp->f_fl_mutex);
957 static void do_unflock(struct file *file, struct file_lock *fl)
959 struct gfs2_file *fp = file->private_data;
960 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
962 mutex_lock(&fp->f_fl_mutex);
963 flock_lock_file_wait(file, fl);
965 gfs2_glock_dq_wait(fl_gh);
966 gfs2_holder_uninit(fl_gh);
968 mutex_unlock(&fp->f_fl_mutex);
972 * gfs2_flock - acquire/release a flock lock on a file
973 * @file: the file pointer
974 * @cmd: either modify or retrieve lock state, possibly wait
975 * @fl: type and range of lock
980 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
982 if (!(fl->fl_flags & FL_FLOCK))
984 if (fl->fl_type & LOCK_MAND)
987 if (fl->fl_type == F_UNLCK) {
988 do_unflock(file, fl);
991 return do_flock(file, cmd, fl);
995 const struct file_operations gfs2_file_fops = {
996 .llseek = gfs2_llseek,
997 .read = do_sync_read,
998 .aio_read = generic_file_aio_read,
999 .write = do_sync_write,
1000 .aio_write = gfs2_file_aio_write,
1001 .unlocked_ioctl = gfs2_ioctl,
1004 .release = gfs2_close,
1005 .fsync = gfs2_fsync,
1007 .flock = gfs2_flock,
1008 .splice_read = generic_file_splice_read,
1009 .splice_write = generic_file_splice_write,
1010 .setlease = gfs2_setlease,
1011 .fallocate = gfs2_fallocate,
1014 const struct file_operations gfs2_dir_fops = {
1015 .readdir = gfs2_readdir,
1016 .unlocked_ioctl = gfs2_ioctl,
1018 .release = gfs2_close,
1019 .fsync = gfs2_fsync,
1021 .flock = gfs2_flock,
1022 .llseek = default_llseek,
1025 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1027 const struct file_operations gfs2_file_fops_nolock = {
1028 .llseek = gfs2_llseek,
1029 .read = do_sync_read,
1030 .aio_read = generic_file_aio_read,
1031 .write = do_sync_write,
1032 .aio_write = gfs2_file_aio_write,
1033 .unlocked_ioctl = gfs2_ioctl,
1036 .release = gfs2_close,
1037 .fsync = gfs2_fsync,
1038 .splice_read = generic_file_splice_read,
1039 .splice_write = generic_file_splice_write,
1040 .setlease = generic_setlease,
1041 .fallocate = gfs2_fallocate,
1044 const struct file_operations gfs2_dir_fops_nolock = {
1045 .readdir = gfs2_readdir,
1046 .unlocked_ioctl = gfs2_ioctl,
1048 .release = gfs2_close,
1049 .fsync = gfs2_fsync,
1050 .llseek = default_llseek,