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/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; /* Nothing to do */
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);
142 * gfs2_write_super - disk commit all incore transactions
143 * @sb: the filesystem
145 * This function is called every time sync(2) is called.
146 * After this exits, all dirty buffers are synced.
149 static void gfs2_write_super(struct super_block *sb)
151 gfs2_log_flush(sb->s_fs_info, NULL);
155 * gfs2_write_super_lockfs - prevent further writes to the filesystem
156 * @sb: the VFS structure for the filesystem
160 static void gfs2_write_super_lockfs(struct super_block *sb)
162 struct gfs2_sbd *sdp = sb->s_fs_info;
166 error = gfs2_freeze_fs(sdp);
172 fs_err(sdp, "waiting for recovery before freeze\n");
176 fs_err(sdp, "error freezing FS: %d\n", error);
180 fs_err(sdp, "retrying...\n");
186 * gfs2_unlockfs - reallow writes to the filesystem
187 * @sb: the VFS structure for the filesystem
191 static void gfs2_unlockfs(struct super_block *sb)
193 gfs2_unfreeze_fs(sb->s_fs_info);
197 * gfs2_statfs - Gather and return stats about the filesystem
198 * @sb: The superblock
199 * @statfsbuf: The buffer
201 * Returns: 0 on success or error code
204 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
206 struct super_block *sb = dentry->d_inode->i_sb;
207 struct gfs2_sbd *sdp = sb->s_fs_info;
208 struct gfs2_statfs_change sc;
211 if (gfs2_tune_get(sdp, gt_statfs_slow))
212 error = gfs2_statfs_slow(sdp, &sc);
214 error = gfs2_statfs_i(sdp, &sc);
219 buf->f_type = GFS2_MAGIC;
220 buf->f_bsize = sdp->sd_sb.sb_bsize;
221 buf->f_blocks = sc.sc_total;
222 buf->f_bfree = sc.sc_free;
223 buf->f_bavail = sc.sc_free;
224 buf->f_files = sc.sc_dinodes + sc.sc_free;
225 buf->f_ffree = sc.sc_free;
226 buf->f_namelen = GFS2_FNAMESIZE;
232 * gfs2_remount_fs - called when the FS is remounted
233 * @sb: the filesystem
234 * @flags: the remount flags
235 * @data: extra data passed in (not used right now)
240 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
242 struct gfs2_sbd *sdp = sb->s_fs_info;
245 error = gfs2_mount_args(sdp, data, 1);
249 if (sdp->sd_args.ar_spectator)
252 if (*flags & MS_RDONLY) {
253 if (!(sb->s_flags & MS_RDONLY))
254 error = gfs2_make_fs_ro(sdp);
255 } else if (!(*flags & MS_RDONLY) &&
256 (sb->s_flags & MS_RDONLY)) {
257 error = gfs2_make_fs_rw(sdp);
261 if (*flags & (MS_NOATIME | MS_NODIRATIME))
262 set_bit(SDF_NOATIME, &sdp->sd_flags);
264 clear_bit(SDF_NOATIME, &sdp->sd_flags);
266 /* Don't let the VFS update atimes. GFS2 handles this itself. */
267 *flags |= MS_NOATIME | MS_NODIRATIME;
273 * gfs2_clear_inode - Deallocate an inode when VFS is done with it
274 * @inode: The VFS inode
278 static void gfs2_clear_inode(struct inode *inode)
280 /* This tells us its a "real" inode and not one which only
281 * serves to contain an address space (see rgrp.c, meta_io.c)
282 * which therefore doesn't have its own glocks.
284 if (inode->u.generic_ip) {
285 struct gfs2_inode *ip = GFS2_I(inode);
286 gfs2_glock_inode_squish(inode);
287 gfs2_assert(inode->i_sb->s_fs_info, ip->i_gl->gl_state == LM_ST_UNLOCKED);
288 ip->i_gl->gl_object = NULL;
289 gfs2_glock_schedule_for_reclaim(ip->i_gl);
290 gfs2_glock_put(ip->i_gl);
292 if (ip->i_iopen_gh.gh_gl)
293 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
298 * gfs2_show_options - Show mount options for /proc/mounts
299 * @s: seq_file structure
302 * Returns: 0 on success or error code
305 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
307 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
308 struct gfs2_args *args = &sdp->sd_args;
310 if (args->ar_lockproto[0])
311 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
312 if (args->ar_locktable[0])
313 seq_printf(s, ",locktable=%s", args->ar_locktable);
314 if (args->ar_hostdata[0])
315 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
316 if (args->ar_spectator)
317 seq_printf(s, ",spectator");
318 if (args->ar_ignore_local_fs)
319 seq_printf(s, ",ignore_local_fs");
320 if (args->ar_localflocks)
321 seq_printf(s, ",localflocks");
322 if (args->ar_localcaching)
323 seq_printf(s, ",localcaching");
325 seq_printf(s, ",debug");
326 if (args->ar_upgrade)
327 seq_printf(s, ",upgrade");
328 if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
329 seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
330 if (args->ar_posix_acl)
331 seq_printf(s, ",acl");
332 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
334 switch (args->ar_quota) {
338 case GFS2_QUOTA_ACCOUNT:
348 seq_printf(s, ",quota=%s", state);
350 if (args->ar_suiddir)
351 seq_printf(s, ",suiddir");
352 if (args->ar_data != GFS2_DATA_DEFAULT) {
354 switch (args->ar_data) {
355 case GFS2_DATA_WRITEBACK:
358 case GFS2_DATA_ORDERED:
365 seq_printf(s, ",data=%s", state);
372 * We have to (at the moment) hold the inodes main lock to cover
373 * the gap between unlocking the shared lock on the iopen lock and
374 * taking the exclusive lock. I'd rather do a shared -> exclusive
375 * conversion on the iopen lock, but we can change that later. This
376 * is safe, just less efficient.
378 static void gfs2_delete_inode(struct inode *inode)
380 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
381 struct gfs2_inode *ip = GFS2_I(inode);
382 struct gfs2_holder gh;
385 if (!inode->u.generic_ip)
388 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &gh);
389 if (unlikely(error)) {
390 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
394 gfs2_glock_dq(&ip->i_iopen_gh);
395 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
396 error = gfs2_glock_nq(&ip->i_iopen_gh);
400 if (S_ISDIR(ip->i_di.di_mode) &&
401 (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
402 error = gfs2_dir_exhash_dealloc(ip);
407 if (ip->i_di.di_eattr) {
408 error = gfs2_ea_dealloc(ip);
413 if (!gfs2_is_stuffed(ip)) {
414 error = gfs2_file_dealloc(ip);
419 error = gfs2_dinode_dealloc(ip);
422 gfs2_glock_dq(&ip->i_iopen_gh);
424 gfs2_holder_uninit(&ip->i_iopen_gh);
425 gfs2_glock_dq_uninit(&gh);
427 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
429 truncate_inode_pages(&inode->i_data, 0);
435 static struct inode *gfs2_alloc_inode(struct super_block *sb)
437 struct gfs2_sbd *sdp = sb->s_fs_info;
438 struct gfs2_inode *ip;
440 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
444 ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
445 ip->i_last_pfault = jiffies;
450 static void gfs2_destroy_inode(struct inode *inode)
452 kmem_cache_free(gfs2_inode_cachep, inode);
455 struct super_operations gfs2_super_ops = {
456 .alloc_inode = gfs2_alloc_inode,
457 .destroy_inode = gfs2_destroy_inode,
458 .write_inode = gfs2_write_inode,
459 .delete_inode = gfs2_delete_inode,
460 .put_super = gfs2_put_super,
461 .write_super = gfs2_write_super,
462 .write_super_lockfs = gfs2_write_super_lockfs,
463 .unlockfs = gfs2_unlockfs,
464 .statfs = gfs2_statfs,
465 .remount_fs = gfs2_remount_fs,
466 .clear_inode = gfs2_clear_inode,
467 .show_options = gfs2_show_options,