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 v.2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/statfs.h>
16 #include <linux/vmalloc.h>
17 #include <linux/seq_file.h>
18 #include <linux/mount.h>
19 #include <linux/kthread.h>
20 #include <linux/delay.h>
21 #include <linux/gfs2_ondisk.h>
22 #include <linux/crc32.h>
25 #include "lm_interface.h"
32 #include "ops_super.h"
45 * gfs2_write_inode - Make sure the inode is stable on the disk
47 * @sync: synchronous write flag
52 static int gfs2_write_inode(struct inode *inode, int sync)
54 struct gfs2_inode *ip = GFS2_I(inode);
56 /* Check this is a "normal" inode */
57 if (inode->u.generic_ip) {
58 if (current->flags & PF_MEMALLOC)
61 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
68 * gfs2_put_super - Unmount the filesystem
69 * @sb: The VFS superblock
73 static void gfs2_put_super(struct super_block *sb)
75 struct gfs2_sbd *sdp = sb->s_fs_info;
81 if (!strncmp(sb->s_type->name, "gfs2meta", 8))
82 return; /* meta fs. don't do nothin' */
84 /* Unfreeze the filesystem, if we need to */
86 mutex_lock(&sdp->sd_freeze_lock);
87 if (sdp->sd_freeze_count)
88 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
89 mutex_unlock(&sdp->sd_freeze_lock);
91 kthread_stop(sdp->sd_quotad_process);
92 kthread_stop(sdp->sd_logd_process);
93 kthread_stop(sdp->sd_recoverd_process);
94 while (sdp->sd_glockd_num--)
95 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
96 kthread_stop(sdp->sd_scand_process);
98 if (!(sb->s_flags & MS_RDONLY)) {
99 error = gfs2_make_fs_ro(sdp);
103 /* At this point, we're through modifying the disk */
107 iput(sdp->sd_master_dir);
108 iput(sdp->sd_jindex);
109 iput(sdp->sd_inum_inode);
110 iput(sdp->sd_statfs_inode);
111 iput(sdp->sd_rindex);
112 iput(sdp->sd_quota_inode);
114 gfs2_glock_put(sdp->sd_rename_gl);
115 gfs2_glock_put(sdp->sd_trans_gl);
117 if (!sdp->sd_args.ar_spectator) {
118 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
119 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
120 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
121 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
122 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
123 iput(sdp->sd_ir_inode);
124 iput(sdp->sd_sc_inode);
125 iput(sdp->sd_qc_inode);
128 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
129 gfs2_clear_rgrpd(sdp);
130 gfs2_jindex_free(sdp);
131 /* Take apart glock structures and buffer lists */
132 gfs2_gl_hash_clear(sdp, WAIT);
133 /* Unmount the locking protocol */
134 gfs2_lm_unmount(sdp);
136 /* At this point, we're through participating in the lockspace */
137 gfs2_sys_fs_del(sdp);
139 sb->s_fs_info = NULL;
143 * gfs2_write_super - disk commit all incore transactions
144 * @sb: the filesystem
146 * This function is called every time sync(2) is called.
147 * After this exits, all dirty buffers are synced.
150 static void gfs2_write_super(struct super_block *sb)
152 struct gfs2_sbd *sdp = sb->s_fs_info;
153 gfs2_log_flush(sdp, NULL);
157 * gfs2_write_super_lockfs - prevent further writes to the filesystem
158 * @sb: the VFS structure for the filesystem
162 static void gfs2_write_super_lockfs(struct super_block *sb)
164 struct gfs2_sbd *sdp = sb->s_fs_info;
168 error = gfs2_freeze_fs(sdp);
174 fs_err(sdp, "waiting for recovery before freeze\n");
178 fs_err(sdp, "error freezing FS: %d\n", error);
182 fs_err(sdp, "retrying...\n");
188 * gfs2_unlockfs - reallow writes to the filesystem
189 * @sb: the VFS structure for the filesystem
193 static void gfs2_unlockfs(struct super_block *sb)
195 struct gfs2_sbd *sdp = sb->s_fs_info;
196 gfs2_unfreeze_fs(sdp);
200 * gfs2_statfs - Gather and return stats about the filesystem
201 * @sb: The superblock
202 * @statfsbuf: The buffer
204 * Returns: 0 on success or error code
207 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
209 struct super_block *sb = dentry->d_inode->i_sb;
210 struct gfs2_sbd *sdp = sb->s_fs_info;
211 struct gfs2_statfs_change sc;
214 if (gfs2_tune_get(sdp, gt_statfs_slow))
215 error = gfs2_statfs_slow(sdp, &sc);
217 error = gfs2_statfs_i(sdp, &sc);
222 buf->f_type = GFS2_MAGIC;
223 buf->f_bsize = sdp->sd_sb.sb_bsize;
224 buf->f_blocks = sc.sc_total;
225 buf->f_bfree = sc.sc_free;
226 buf->f_bavail = sc.sc_free;
227 buf->f_files = sc.sc_dinodes + sc.sc_free;
228 buf->f_ffree = sc.sc_free;
229 buf->f_namelen = GFS2_FNAMESIZE;
235 * gfs2_remount_fs - called when the FS is remounted
236 * @sb: the filesystem
237 * @flags: the remount flags
238 * @data: extra data passed in (not used right now)
243 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
245 struct gfs2_sbd *sdp = sb->s_fs_info;
248 error = gfs2_mount_args(sdp, data, 1);
252 if (sdp->sd_args.ar_spectator)
255 if (*flags & MS_RDONLY) {
256 if (!(sb->s_flags & MS_RDONLY))
257 error = gfs2_make_fs_ro(sdp);
258 } else if (!(*flags & MS_RDONLY) &&
259 (sb->s_flags & MS_RDONLY)) {
260 error = gfs2_make_fs_rw(sdp);
264 if (*flags & (MS_NOATIME | MS_NODIRATIME))
265 set_bit(SDF_NOATIME, &sdp->sd_flags);
267 clear_bit(SDF_NOATIME, &sdp->sd_flags);
269 /* Don't let the VFS update atimes. GFS2 handles this itself. */
270 *flags |= MS_NOATIME | MS_NODIRATIME;
276 * gfs2_clear_inode - Deallocate an inode when VFS is done with it
277 * @inode: The VFS inode
281 static void gfs2_clear_inode(struct inode *inode)
283 /* This tells us its a "real" inode and not one which only
284 * serves to contain an address space (see rgrp.c, meta_io.c)
285 * which therefore doesn't have its own glocks.
287 if (inode->u.generic_ip) {
288 struct gfs2_inode *ip = GFS2_I(inode);
289 gfs2_glock_inode_squish(inode);
290 gfs2_assert(inode->i_sb->s_fs_info, ip->i_gl->gl_state == LM_ST_UNLOCKED);
291 ip->i_gl->gl_object = NULL;
292 gfs2_glock_schedule_for_reclaim(ip->i_gl);
293 gfs2_glock_put(ip->i_gl);
295 if (ip->i_iopen_gh.gh_gl)
296 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
301 * gfs2_show_options - Show mount options for /proc/mounts
302 * @s: seq_file structure
305 * Returns: 0 on success or error code
308 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
310 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
311 struct gfs2_args *args = &sdp->sd_args;
313 if (args->ar_lockproto[0])
314 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
315 if (args->ar_locktable[0])
316 seq_printf(s, ",locktable=%s", args->ar_locktable);
317 if (args->ar_hostdata[0])
318 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
319 if (args->ar_spectator)
320 seq_printf(s, ",spectator");
321 if (args->ar_ignore_local_fs)
322 seq_printf(s, ",ignore_local_fs");
323 if (args->ar_localflocks)
324 seq_printf(s, ",localflocks");
325 if (args->ar_localcaching)
326 seq_printf(s, ",localcaching");
328 seq_printf(s, ",debug");
329 if (args->ar_upgrade)
330 seq_printf(s, ",upgrade");
331 if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
332 seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
333 if (args->ar_posix_acl)
334 seq_printf(s, ",acl");
335 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
337 switch (args->ar_quota) {
341 case GFS2_QUOTA_ACCOUNT:
351 seq_printf(s, ",quota=%s", state);
353 if (args->ar_suiddir)
354 seq_printf(s, ",suiddir");
355 if (args->ar_data != GFS2_DATA_DEFAULT) {
357 switch (args->ar_data) {
358 case GFS2_DATA_WRITEBACK:
361 case GFS2_DATA_ORDERED:
368 seq_printf(s, ",data=%s", state);
375 * We have to (at the moment) hold the inodes main lock to cover
376 * the gap between unlocking the shared lock on the iopen lock and
377 * taking the exclusive lock. I'd rather do a shared -> exclusive
378 * conversion on the iopen lock, but we can change that later. This
379 * is safe, just less efficient.
381 static void gfs2_delete_inode(struct inode *inode)
383 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
384 struct gfs2_inode *ip = GFS2_I(inode);
385 struct gfs2_holder gh;
388 if (!inode->u.generic_ip)
391 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &gh);
392 if (unlikely(error)) {
393 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
397 gfs2_glock_dq(&ip->i_iopen_gh);
398 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
399 error = gfs2_glock_nq(&ip->i_iopen_gh);
403 if (S_ISDIR(ip->i_di.di_mode) &&
404 (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
405 error = gfs2_dir_exhash_dealloc(ip);
410 if (ip->i_di.di_eattr) {
411 error = gfs2_ea_dealloc(ip);
416 if (!gfs2_is_stuffed(ip)) {
417 error = gfs2_file_dealloc(ip);
422 error = gfs2_dinode_dealloc(ip);
425 gfs2_glock_dq(&ip->i_iopen_gh);
427 gfs2_holder_uninit(&ip->i_iopen_gh);
428 gfs2_glock_dq_uninit(&gh);
430 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
432 truncate_inode_pages(&inode->i_data, 0);
438 static struct inode *gfs2_alloc_inode(struct super_block *sb)
440 struct gfs2_sbd *sdp = sb->s_fs_info;
441 struct gfs2_inode *ip;
443 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
447 ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
448 ip->i_last_pfault = jiffies;
453 static void gfs2_destroy_inode(struct inode *inode)
455 kmem_cache_free(gfs2_inode_cachep, inode);
458 struct super_operations gfs2_super_ops = {
459 .alloc_inode = gfs2_alloc_inode,
460 .destroy_inode = gfs2_destroy_inode,
461 .write_inode = gfs2_write_inode,
462 .delete_inode = gfs2_delete_inode,
463 .put_super = gfs2_put_super,
464 .write_super = gfs2_write_super,
465 .write_super_lockfs = gfs2_write_super_lockfs,
466 .unlockfs = gfs2_unlockfs,
467 .statfs = gfs2_statfs,
468 .remount_fs = gfs2_remount_fs,
469 .clear_inode = gfs2_clear_inode,
470 .show_options = gfs2_show_options,