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/crc32.h>
23 #include <linux/lm_interface.h>
24 #include <linux/writeback.h>
25 #include <asm/uaccess.h>
41 #include "ops_address.h"
44 * gfs2_llseek - seek to a location in a file
47 * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
49 * SEEK_END requires the glock for the file because it references the
52 * Returns: The new offset, or errno
55 static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
57 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
58 struct gfs2_holder i_gh;
62 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
65 error = generic_file_llseek_unlocked(file, offset, origin);
66 gfs2_glock_dq_uninit(&i_gh);
69 error = generic_file_llseek_unlocked(file, offset, origin);
75 * gfs2_readdir - Read directory entries from a directory
76 * @file: The directory to read from
77 * @dirent: Buffer for dirents
78 * @filldir: Function used to do the copying
83 static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
85 struct inode *dir = file->f_mapping->host;
86 struct gfs2_inode *dip = GFS2_I(dir);
87 struct gfs2_holder d_gh;
88 u64 offset = file->f_pos;
91 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
92 error = gfs2_glock_nq(&d_gh);
94 gfs2_holder_uninit(&d_gh);
98 error = gfs2_dir_read(dir, &offset, dirent, filldir);
100 gfs2_glock_dq_uninit(&d_gh);
102 file->f_pos = offset;
109 * @table: A table of 32 u32 flags
110 * @val: a 32 bit value to convert
112 * This function can be used to convert between fsflags values and
113 * GFS2's own flags values.
115 * Returns: the converted flags
117 static u32 fsflags_cvt(const u32 *table, u32 val)
129 static const u32 fsflags_to_gfs2[32] = {
131 [4] = GFS2_DIF_IMMUTABLE,
132 [5] = GFS2_DIF_APPENDONLY,
133 [7] = GFS2_DIF_NOATIME,
134 [12] = GFS2_DIF_EXHASH,
135 [14] = GFS2_DIF_INHERIT_JDATA,
138 static const u32 gfs2_to_fsflags[32] = {
139 [gfs2fl_Sync] = FS_SYNC_FL,
140 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
141 [gfs2fl_AppendOnly] = FS_APPEND_FL,
142 [gfs2fl_NoAtime] = FS_NOATIME_FL,
143 [gfs2fl_ExHash] = FS_INDEX_FL,
144 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
147 static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
149 struct inode *inode = filp->f_path.dentry->d_inode;
150 struct gfs2_inode *ip = GFS2_I(inode);
151 struct gfs2_holder gh;
155 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
156 error = gfs2_glock_nq(&gh);
160 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags);
161 if (!S_ISDIR(inode->i_mode) && ip->i_di.di_flags & GFS2_DIF_JDATA)
162 fsflags |= FS_JOURNAL_DATA_FL;
163 if (put_user(fsflags, ptr))
167 gfs2_holder_uninit(&gh);
171 void gfs2_set_inode_flags(struct inode *inode)
173 struct gfs2_inode *ip = GFS2_I(inode);
174 struct gfs2_dinode_host *di = &ip->i_di;
175 unsigned int flags = inode->i_flags;
177 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
178 if (di->di_flags & GFS2_DIF_IMMUTABLE)
179 flags |= S_IMMUTABLE;
180 if (di->di_flags & GFS2_DIF_APPENDONLY)
182 if (di->di_flags & GFS2_DIF_NOATIME)
184 if (di->di_flags & 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);
223 flags = ip->i_di.di_flags;
224 new_flags = (flags & ~mask) | (reqflags & mask);
225 if ((new_flags ^ flags) == 0)
229 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
233 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
235 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
237 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
238 !capable(CAP_LINUX_IMMUTABLE))
240 if (!IS_IMMUTABLE(inode)) {
241 error = gfs2_permission(inode, MAY_WRITE);
245 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
246 if (flags & GFS2_DIF_JDATA)
247 gfs2_log_flush(sdp, ip->i_gl);
248 error = filemap_fdatawrite(inode->i_mapping);
251 error = filemap_fdatawait(inode->i_mapping);
255 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
258 error = gfs2_meta_inode_buffer(ip, &bh);
261 gfs2_trans_add_bh(ip->i_gl, bh, 1);
262 ip->i_di.di_flags = new_flags;
263 gfs2_dinode_out(ip, bh->b_data);
265 gfs2_set_inode_flags(inode);
266 gfs2_set_aops(inode);
270 gfs2_glock_dq_uninit(&gh);
272 mnt_drop_write(filp->f_path.mnt);
276 static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
278 struct inode *inode = filp->f_path.dentry->d_inode;
279 u32 fsflags, gfsflags;
280 if (get_user(fsflags, ptr))
282 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
283 if (!S_ISDIR(inode->i_mode)) {
284 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
285 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
286 return do_gfs2_set_flags(filp, gfsflags, ~0);
288 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
291 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
294 case FS_IOC_GETFLAGS:
295 return gfs2_get_flags(filp, (u32 __user *)arg);
296 case FS_IOC_SETFLAGS:
297 return gfs2_set_flags(filp, (u32 __user *)arg);
303 * gfs2_allocate_page_backing - Use bmap to allocate blocks
304 * @page: The (locked) page to allocate backing for
306 * We try to allocate all the blocks required for the page in
307 * one go. This might fail for various reasons, so we keep
308 * trying until all the blocks to back this page are allocated.
309 * If some of the blocks are already allocated, thats ok too.
312 static int gfs2_allocate_page_backing(struct page *page)
314 struct inode *inode = page->mapping->host;
315 struct buffer_head bh;
316 unsigned long size = PAGE_CACHE_SIZE;
317 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
322 gfs2_block_map(inode, lblock, &bh, 1);
323 if (!buffer_mapped(&bh))
326 lblock += (bh.b_size >> inode->i_blkbits);
332 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
333 * @vma: The virtual memory area
334 * @page: The page which is about to become writable
336 * When the page becomes writable, we need to ensure that we have
337 * blocks allocated on disk to back that page.
340 static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
342 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
343 struct gfs2_inode *ip = GFS2_I(inode);
344 struct gfs2_sbd *sdp = GFS2_SB(inode);
345 unsigned long last_index;
346 u64 pos = page->index << (PAGE_CACHE_SIZE - inode->i_blkbits);
347 unsigned int data_blocks, ind_blocks, rblocks;
348 int alloc_required = 0;
349 struct gfs2_holder gh;
350 struct gfs2_alloc *al;
353 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
354 ret = gfs2_glock_nq(&gh);
358 set_bit(GIF_SW_PAGED, &ip->i_flags);
359 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
360 ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required);
361 if (ret || !alloc_required)
364 al = gfs2_alloc_get(ip);
368 ret = gfs2_quota_lock_check(ip);
371 al->al_requested = data_blocks + ind_blocks;
372 ret = gfs2_inplace_reserve(ip);
374 goto out_quota_unlock;
376 rblocks = RES_DINODE + ind_blocks;
377 if (gfs2_is_jdata(ip))
378 rblocks += data_blocks ? data_blocks : 1;
379 if (ind_blocks || data_blocks)
380 rblocks += RES_STATFS + RES_QUOTA;
381 ret = gfs2_trans_begin(sdp, rblocks, 0);
387 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
388 if (page->index > last_index)
389 goto out_unlock_page;
391 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
392 goto out_unlock_page;
393 if (gfs2_is_stuffed(ip)) {
394 ret = gfs2_unstuff_dinode(ip, page);
396 goto out_unlock_page;
398 ret = gfs2_allocate_page_backing(page);
404 gfs2_inplace_release(ip);
406 gfs2_quota_unlock(ip);
412 gfs2_holder_uninit(&gh);
416 static struct vm_operations_struct gfs2_vm_ops = {
417 .fault = filemap_fault,
418 .page_mkwrite = gfs2_page_mkwrite,
424 * @file: The file to map
425 * @vma: The VMA which described the mapping
427 * Returns: 0 or error code
430 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
432 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
433 struct gfs2_holder i_gh;
436 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
437 error = gfs2_glock_nq(&i_gh);
439 gfs2_holder_uninit(&i_gh);
443 vma->vm_ops = &gfs2_vm_ops;
445 gfs2_glock_dq_uninit(&i_gh);
451 * gfs2_open - open a file
452 * @inode: the inode to open
453 * @file: the struct file for this opening
458 static int gfs2_open(struct inode *inode, struct file *file)
460 struct gfs2_inode *ip = GFS2_I(inode);
461 struct gfs2_holder i_gh;
462 struct gfs2_file *fp;
465 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
469 mutex_init(&fp->f_fl_mutex);
471 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
472 file->private_data = fp;
474 if (S_ISREG(ip->i_inode.i_mode)) {
475 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
480 if (!(file->f_flags & O_LARGEFILE) &&
481 ip->i_di.di_size > MAX_NON_LFS) {
486 gfs2_glock_dq_uninit(&i_gh);
492 gfs2_glock_dq_uninit(&i_gh);
494 file->private_data = NULL;
500 * gfs2_close - called to close a struct file
501 * @inode: the inode the struct file belongs to
502 * @file: the struct file being closed
507 static int gfs2_close(struct inode *inode, struct file *file)
509 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
510 struct gfs2_file *fp;
512 fp = file->private_data;
513 file->private_data = NULL;
515 if (gfs2_assert_warn(sdp, fp))
524 * gfs2_fsync - sync the dirty data for a file (across the cluster)
525 * @file: the file that points to the dentry (we ignore this)
526 * @dentry: the dentry that points to the inode to sync
528 * The VFS will flush "normal" data for us. We only need to worry
529 * about metadata here. For journaled data, we just do a log flush
530 * as we can't avoid it. Otherwise we can just bale out if datasync
531 * is set. For stuffed inodes we must flush the log in order to
532 * ensure that all data is on disk.
534 * The call to write_inode_now() is there to write back metadata and
535 * the inode itself. It does also try and write the data, but thats
536 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
542 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
544 struct inode *inode = dentry->d_inode;
545 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
548 if (gfs2_is_jdata(GFS2_I(inode))) {
549 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
553 if (sync_state != 0) {
555 ret = write_inode_now(inode, 0);
557 if (gfs2_is_stuffed(GFS2_I(inode)))
558 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
565 * gfs2_setlease - acquire/release a file lease
566 * @file: the file pointer
573 static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
575 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
578 * We don't currently have a way to enforce a lease across the whole
579 * cluster; until we do, disable leases (by just returning -EINVAL),
580 * unless the administrator has requested purely local locking.
582 if (!sdp->sd_args.ar_localflocks)
584 return generic_setlease(file, arg, fl);
587 static int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name,
588 struct file *file, struct file_lock *fl)
591 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
592 error = sdp->sd_lockstruct.ls_ops->lm_plock_get(
593 sdp->sd_lockstruct.ls_lockspace, name, file, fl);
597 static int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name,
598 struct file *file, int cmd, struct file_lock *fl)
601 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
602 error = sdp->sd_lockstruct.ls_ops->lm_plock(
603 sdp->sd_lockstruct.ls_lockspace, name, file, cmd, fl);
607 static int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name,
608 struct file *file, struct file_lock *fl)
611 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
612 error = sdp->sd_lockstruct.ls_ops->lm_punlock(
613 sdp->sd_lockstruct.ls_lockspace, name, file, fl);
618 * gfs2_lock - acquire/release a posix lock on a file
619 * @file: the file pointer
620 * @cmd: either modify or retrieve lock state, possibly wait
621 * @fl: type and range of lock
626 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
628 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
629 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
630 struct lm_lockname name =
631 { .ln_number = ip->i_no_addr,
632 .ln_type = LM_TYPE_PLOCK };
634 if (!(fl->fl_flags & FL_POSIX))
636 if (__mandatory_lock(&ip->i_inode))
639 if (cmd == F_CANCELLK) {
642 fl->fl_type = F_UNLCK;
645 return gfs2_lm_plock_get(sdp, &name, file, fl);
646 else if (fl->fl_type == F_UNLCK)
647 return gfs2_lm_punlock(sdp, &name, file, fl);
649 return gfs2_lm_plock(sdp, &name, file, cmd, fl);
652 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
654 struct gfs2_file *fp = file->private_data;
655 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
656 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
657 struct gfs2_glock *gl;
662 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
663 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
665 mutex_lock(&fp->f_fl_mutex);
669 if (fl_gh->gh_state == state)
671 flock_lock_file_wait(file,
672 &(struct file_lock){.fl_type = F_UNLCK});
673 gfs2_glock_dq_wait(fl_gh);
674 gfs2_holder_reinit(state, flags, fl_gh);
676 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
677 &gfs2_flock_glops, CREATE, &gl);
680 gfs2_holder_init(gl, state, flags, fl_gh);
683 error = gfs2_glock_nq(fl_gh);
685 gfs2_holder_uninit(fl_gh);
686 if (error == GLR_TRYFAILED)
689 error = flock_lock_file_wait(file, fl);
690 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
694 mutex_unlock(&fp->f_fl_mutex);
698 static void do_unflock(struct file *file, struct file_lock *fl)
700 struct gfs2_file *fp = file->private_data;
701 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
703 mutex_lock(&fp->f_fl_mutex);
704 flock_lock_file_wait(file, fl);
706 gfs2_glock_dq_uninit(fl_gh);
707 mutex_unlock(&fp->f_fl_mutex);
711 * gfs2_flock - acquire/release a flock lock on a file
712 * @file: the file pointer
713 * @cmd: either modify or retrieve lock state, possibly wait
714 * @fl: type and range of lock
719 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
721 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
723 if (!(fl->fl_flags & FL_FLOCK))
725 if (__mandatory_lock(&ip->i_inode))
728 if (fl->fl_type == F_UNLCK) {
729 do_unflock(file, fl);
732 return do_flock(file, cmd, fl);
736 const struct file_operations gfs2_file_fops = {
737 .llseek = gfs2_llseek,
738 .read = do_sync_read,
739 .aio_read = generic_file_aio_read,
740 .write = do_sync_write,
741 .aio_write = generic_file_aio_write,
742 .unlocked_ioctl = gfs2_ioctl,
745 .release = gfs2_close,
749 .splice_read = generic_file_splice_read,
750 .splice_write = generic_file_splice_write,
751 .setlease = gfs2_setlease,
754 const struct file_operations gfs2_dir_fops = {
755 .readdir = gfs2_readdir,
756 .unlocked_ioctl = gfs2_ioctl,
758 .release = gfs2_close,
764 const struct file_operations gfs2_file_fops_nolock = {
765 .llseek = gfs2_llseek,
766 .read = do_sync_read,
767 .aio_read = generic_file_aio_read,
768 .write = do_sync_write,
769 .aio_write = generic_file_aio_write,
770 .unlocked_ioctl = gfs2_ioctl,
773 .release = gfs2_close,
775 .splice_read = generic_file_splice_read,
776 .splice_write = generic_file_splice_write,
777 .setlease = gfs2_setlease,
780 const struct file_operations gfs2_dir_fops_nolock = {
781 .readdir = gfs2_readdir,
782 .unlocked_ioctl = gfs2_ioctl,
784 .release = gfs2_close,