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 * do_gfs2_set_flags - set flags on an inode
207 * @filp: file pointer
208 * @reqflags: 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, NORMAL_FLUSH);
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 * @filep: 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 * @vmf: The virtual memory fault containing the page 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 struct gfs2_alloc_parms ap = { .aflags = 0, };
387 unsigned long last_index;
388 u64 pos = page->index << PAGE_CACHE_SHIFT;
389 unsigned int data_blocks, ind_blocks, rblocks;
390 struct gfs2_holder gh;
394 sb_start_pagefault(inode->i_sb);
396 /* Update file times before taking page lock */
397 file_update_time(vma->vm_file);
399 ret = get_write_access(inode);
403 ret = gfs2_rs_alloc(ip);
405 goto out_write_access;
407 gfs2_size_hint(vma->vm_file, pos, PAGE_CACHE_SIZE);
409 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
410 ret = gfs2_glock_nq(&gh);
414 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
415 set_bit(GIF_SW_PAGED, &ip->i_flags);
417 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) {
419 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
426 ret = gfs2_rindex_update(sdp);
430 ret = gfs2_quota_lock_check(ip);
433 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
434 ap.target = data_blocks + ind_blocks;
435 ret = gfs2_inplace_reserve(ip, &ap);
437 goto out_quota_unlock;
439 rblocks = RES_DINODE + ind_blocks;
440 if (gfs2_is_jdata(ip))
441 rblocks += data_blocks ? data_blocks : 1;
442 if (ind_blocks || data_blocks) {
443 rblocks += RES_STATFS + RES_QUOTA;
444 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
446 ret = gfs2_trans_begin(sdp, rblocks, 0);
452 size = i_size_read(inode);
453 last_index = (size - 1) >> PAGE_CACHE_SHIFT;
454 /* Check page index against inode size */
455 if (size == 0 || (page->index > last_index))
459 /* If truncated, we must retry the operation, we may have raced
460 * with the glock demotion code.
462 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
465 /* Unstuff, if required, and allocate backing blocks for page */
467 if (gfs2_is_stuffed(ip))
468 ret = gfs2_unstuff_dinode(ip, page);
470 ret = gfs2_allocate_page_backing(page);
477 gfs2_inplace_release(ip);
479 gfs2_quota_unlock(ip);
483 gfs2_holder_uninit(&gh);
485 set_page_dirty(page);
486 wait_for_stable_page(page);
489 put_write_access(inode);
491 sb_end_pagefault(inode->i_sb);
492 return block_page_mkwrite_return(ret);
495 static const struct vm_operations_struct gfs2_vm_ops = {
496 .fault = filemap_fault,
497 .map_pages = filemap_map_pages,
498 .page_mkwrite = gfs2_page_mkwrite,
499 .remap_pages = generic_file_remap_pages,
504 * @file: The file to map
505 * @vma: The VMA which described the mapping
507 * There is no need to get a lock here unless we should be updating
508 * atime. We ignore any locking errors since the only consequence is
509 * a missed atime update (which will just be deferred until later).
514 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
516 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
518 if (!(file->f_flags & O_NOATIME) &&
519 !IS_NOATIME(&ip->i_inode)) {
520 struct gfs2_holder i_gh;
523 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
527 /* grab lock to update inode */
528 gfs2_glock_dq_uninit(&i_gh);
531 vma->vm_ops = &gfs2_vm_ops;
537 * gfs2_open_common - This is common to open and atomic_open
538 * @inode: The inode being opened
539 * @file: The file being opened
541 * This maybe called under a glock or not depending upon how it has
542 * been called. We must always be called under a glock for regular
543 * files, however. For other file types, it does not matter whether
544 * we hold the glock or not.
546 * Returns: Error code or 0 for success
549 int gfs2_open_common(struct inode *inode, struct file *file)
551 struct gfs2_file *fp;
554 if (S_ISREG(inode->i_mode)) {
555 ret = generic_file_open(inode, file);
560 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
564 mutex_init(&fp->f_fl_mutex);
566 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
567 file->private_data = fp;
572 * gfs2_open - open a file
573 * @inode: the inode to open
574 * @file: the struct file for this opening
576 * After atomic_open, this function is only used for opening files
577 * which are already cached. We must still get the glock for regular
578 * files to ensure that we have the file size uptodate for the large
579 * file check which is in the common code. That is only an issue for
580 * regular files though.
585 static int gfs2_open(struct inode *inode, struct file *file)
587 struct gfs2_inode *ip = GFS2_I(inode);
588 struct gfs2_holder i_gh;
590 bool need_unlock = false;
592 if (S_ISREG(ip->i_inode.i_mode)) {
593 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
600 error = gfs2_open_common(inode, file);
603 gfs2_glock_dq_uninit(&i_gh);
609 * gfs2_release - called to close a struct file
610 * @inode: the inode the struct file belongs to
611 * @file: the struct file being closed
616 static int gfs2_release(struct inode *inode, struct file *file)
618 struct gfs2_inode *ip = GFS2_I(inode);
620 kfree(file->private_data);
621 file->private_data = NULL;
623 if (!(file->f_mode & FMODE_WRITE))
626 gfs2_rs_delete(ip, &inode->i_writecount);
631 * gfs2_fsync - sync the dirty data for a file (across the cluster)
632 * @file: the file that points to the dentry
633 * @start: the start position in the file to sync
634 * @end: the end position in the file to sync
635 * @datasync: set if we can ignore timestamp changes
637 * We split the data flushing here so that we don't wait for the data
638 * until after we've also sent the metadata to disk. Note that for
639 * data=ordered, we will write & wait for the data at the log flush
640 * stage anyway, so this is unlikely to make much of a difference
641 * except in the data=writeback case.
643 * If the fdatawrite fails due to any reason except -EIO, we will
644 * continue the remainder of the fsync, although we'll still report
645 * the error at the end. This is to match filemap_write_and_wait_range()
651 static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
654 struct address_space *mapping = file->f_mapping;
655 struct inode *inode = mapping->host;
656 int sync_state = inode->i_state & I_DIRTY;
657 struct gfs2_inode *ip = GFS2_I(inode);
658 int ret = 0, ret1 = 0;
660 if (mapping->nrpages) {
661 ret1 = filemap_fdatawrite_range(mapping, start, end);
666 if (!gfs2_is_jdata(ip))
667 sync_state &= ~I_DIRTY_PAGES;
669 sync_state &= ~I_DIRTY_SYNC;
672 ret = sync_inode_metadata(inode, 1);
675 if (gfs2_is_jdata(ip))
676 filemap_write_and_wait(mapping);
677 gfs2_ail_flush(ip->i_gl, 1);
680 if (mapping->nrpages)
681 ret = filemap_fdatawait_range(mapping, start, end);
683 return ret ? ret : ret1;
687 * gfs2_file_write_iter - Perform a write to a file
688 * @iocb: The io context
689 * @iov: The data to write
690 * @nr_segs: Number of @iov segments
691 * @pos: The file position
693 * We have to do a lock/unlock here to refresh the inode size for
694 * O_APPEND writes, otherwise we can land up writing at the wrong
695 * offset. There is still a race, but provided the app is using its
696 * own file locking, this will make O_APPEND work as expected.
700 static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
702 struct file *file = iocb->ki_filp;
703 struct gfs2_inode *ip = GFS2_I(file_inode(file));
706 ret = gfs2_rs_alloc(ip);
710 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
712 if (file->f_flags & O_APPEND) {
713 struct gfs2_holder gh;
715 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
718 gfs2_glock_dq_uninit(&gh);
721 return generic_file_write_iter(iocb, from);
724 static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
727 struct gfs2_inode *ip = GFS2_I(inode);
728 struct buffer_head *dibh;
731 unsigned int nr_blks;
732 sector_t lblock = offset >> inode->i_blkbits;
734 error = gfs2_meta_inode_buffer(ip, &dibh);
738 gfs2_trans_add_meta(ip->i_gl, dibh);
740 if (gfs2_is_stuffed(ip)) {
741 error = gfs2_unstuff_dinode(ip, NULL);
747 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
749 set_buffer_zeronew(&bh_map);
751 error = gfs2_block_map(inode, lblock, &bh_map, 1);
754 len -= bh_map.b_size;
755 nr_blks = bh_map.b_size >> inode->i_blkbits;
757 if (!buffer_new(&bh_map))
759 if (unlikely(!buffer_zeronew(&bh_map))) {
764 if (offset + size > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE))
765 i_size_write(inode, offset + size);
767 mark_inode_dirty(inode);
774 static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
775 unsigned int *data_blocks, unsigned int *ind_blocks)
777 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
778 unsigned int max_blocks = ip->i_rgd->rd_free_clone;
779 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
781 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
782 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
785 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
786 so it might end up with fewer data blocks */
787 if (max_data <= *data_blocks)
789 *data_blocks = max_data;
790 *ind_blocks = max_blocks - max_data;
791 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
794 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
798 static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
801 struct inode *inode = file_inode(file);
802 struct gfs2_sbd *sdp = GFS2_SB(inode);
803 struct gfs2_inode *ip = GFS2_I(inode);
804 struct gfs2_alloc_parms ap = { .aflags = 0, };
805 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
806 loff_t bytes, max_bytes;
808 const loff_t pos = offset;
809 const loff_t count = len;
810 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
811 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
812 loff_t max_chunk_size = UINT_MAX & bsize_mask;
813 struct gfs2_holder gh;
815 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
817 /* We only support the FALLOC_FL_KEEP_SIZE mode */
818 if (mode & ~FALLOC_FL_KEEP_SIZE)
821 offset &= bsize_mask;
824 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
829 bytes = sdp->sd_sb.sb_bsize;
831 error = gfs2_rs_alloc(ip);
835 mutex_lock(&inode->i_mutex);
837 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
838 error = gfs2_glock_nq(&gh);
842 gfs2_size_hint(file, offset, len);
847 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
852 error = gfs2_quota_lock_check(ip);
857 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
859 ap.target = data_blocks + ind_blocks;
860 error = gfs2_inplace_reserve(ip, &ap);
862 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
866 bytes = sdp->sd_sb.sb_bsize;
872 calc_max_reserv(ip, (len > max_chunk_size)? max_chunk_size: len,
873 &max_bytes, &data_blocks, &ind_blocks);
875 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
876 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
877 if (gfs2_is_jdata(ip))
878 rblocks += data_blocks ? data_blocks : 1;
880 error = gfs2_trans_begin(sdp, rblocks,
881 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
885 error = fallocate_chunk(inode, offset, max_bytes, mode);
893 gfs2_inplace_release(ip);
894 gfs2_quota_unlock(ip);
898 error = generic_write_sync(file, pos, count);
902 gfs2_inplace_release(ip);
904 gfs2_quota_unlock(ip);
908 gfs2_holder_uninit(&gh);
909 mutex_unlock(&inode->i_mutex);
913 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
916 * gfs2_lock - acquire/release a posix lock on a file
917 * @file: the file pointer
918 * @cmd: either modify or retrieve lock state, possibly wait
919 * @fl: type and range of lock
924 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
926 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
927 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
928 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
930 if (!(fl->fl_flags & FL_POSIX))
932 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
935 if (cmd == F_CANCELLK) {
938 fl->fl_type = F_UNLCK;
940 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
941 if (fl->fl_type == F_UNLCK)
942 posix_lock_file_wait(file, fl);
946 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
947 else if (fl->fl_type == F_UNLCK)
948 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
950 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
953 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
955 struct gfs2_file *fp = file->private_data;
956 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
957 struct gfs2_inode *ip = GFS2_I(file_inode(file));
958 struct gfs2_glock *gl;
963 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
964 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT;
966 mutex_lock(&fp->f_fl_mutex);
970 if (fl_gh->gh_state == state)
972 flock_lock_file_wait(file,
973 &(struct file_lock){.fl_type = F_UNLCK});
974 gfs2_glock_dq(fl_gh);
975 gfs2_holder_reinit(state, flags, fl_gh);
977 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
978 &gfs2_flock_glops, CREATE, &gl);
981 gfs2_holder_init(gl, state, flags, fl_gh);
984 error = gfs2_glock_nq(fl_gh);
986 gfs2_holder_uninit(fl_gh);
987 if (error == GLR_TRYFAILED)
990 error = flock_lock_file_wait(file, fl);
991 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
995 mutex_unlock(&fp->f_fl_mutex);
999 static void do_unflock(struct file *file, struct file_lock *fl)
1001 struct gfs2_file *fp = file->private_data;
1002 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1004 mutex_lock(&fp->f_fl_mutex);
1005 flock_lock_file_wait(file, fl);
1007 gfs2_glock_dq_wait(fl_gh);
1008 gfs2_holder_uninit(fl_gh);
1010 mutex_unlock(&fp->f_fl_mutex);
1014 * gfs2_flock - acquire/release a flock lock on a file
1015 * @file: the file pointer
1016 * @cmd: either modify or retrieve lock state, possibly wait
1017 * @fl: type and range of lock
1022 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1024 if (!(fl->fl_flags & FL_FLOCK))
1026 if (fl->fl_type & LOCK_MAND)
1029 if (fl->fl_type == F_UNLCK) {
1030 do_unflock(file, fl);
1033 return do_flock(file, cmd, fl);
1037 const struct file_operations gfs2_file_fops = {
1038 .llseek = gfs2_llseek,
1039 .read = new_sync_read,
1040 .read_iter = generic_file_read_iter,
1041 .write = new_sync_write,
1042 .write_iter = gfs2_file_write_iter,
1043 .unlocked_ioctl = gfs2_ioctl,
1046 .release = gfs2_release,
1047 .fsync = gfs2_fsync,
1049 .flock = gfs2_flock,
1050 .splice_read = generic_file_splice_read,
1051 .splice_write = iter_file_splice_write,
1052 .setlease = simple_nosetlease,
1053 .fallocate = gfs2_fallocate,
1056 const struct file_operations gfs2_dir_fops = {
1057 .iterate = gfs2_readdir,
1058 .unlocked_ioctl = gfs2_ioctl,
1060 .release = gfs2_release,
1061 .fsync = gfs2_fsync,
1063 .flock = gfs2_flock,
1064 .llseek = default_llseek,
1067 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1069 const struct file_operations gfs2_file_fops_nolock = {
1070 .llseek = gfs2_llseek,
1071 .read = new_sync_read,
1072 .read_iter = generic_file_read_iter,
1073 .write = new_sync_write,
1074 .write_iter = gfs2_file_write_iter,
1075 .unlocked_ioctl = gfs2_ioctl,
1078 .release = gfs2_release,
1079 .fsync = gfs2_fsync,
1080 .splice_read = generic_file_splice_read,
1081 .splice_write = iter_file_splice_write,
1082 .setlease = generic_setlease,
1083 .fallocate = gfs2_fallocate,
1086 const struct file_operations gfs2_dir_fops_nolock = {
1087 .iterate = gfs2_readdir,
1088 .unlocked_ioctl = gfs2_ioctl,
1090 .release = gfs2_release,
1091 .fsync = gfs2_fsync,
1092 .llseek = default_llseek,