blob: 728d3169e7bd5b32b112bf29852d52c394ef6915 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
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/posix_acl.h>
16#include <linux/sort.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050017#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050018#include <linux/crc32.h>
Fabio Massimo Di Nitto7d308592006-09-19 07:56:29 +020019#include <linux/lm_interface.h>
Ryan O'Harafcb47e02006-10-03 11:57:35 -040020#include <linux/security.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000021
22#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050023#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000024#include "acl.h"
25#include "bmap.h"
26#include "dir.h"
27#include "eattr.h"
28#include "glock.h"
29#include "glops.h"
30#include "inode.h"
31#include "log.h"
32#include "meta_io.h"
33#include "ops_address.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000034#include "ops_inode.h"
35#include "quota.h"
36#include "rgrp.h"
37#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050038#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000039
Steven Whitehousebb8d8a62007-06-01 14:11:58 +010040struct gfs2_inum_range_host {
41 u64 ir_start;
42 u64 ir_length;
43};
44
David Teiglandb3b94fa2006-01-16 16:50:04 +000045static int iget_test(struct inode *inode, void *opaque)
46{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040047 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010048 u64 *no_addr = opaque;
David Teiglandb3b94fa2006-01-16 16:50:04 +000049
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010050 if (ip->i_no_addr == *no_addr &&
Steven Whitehouse1be38672007-03-01 10:00:53 +000051 inode->i_private != NULL)
David Teiglandb3b94fa2006-01-16 16:50:04 +000052 return 1;
53
54 return 0;
55}
56
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040057static int iget_set(struct inode *inode, void *opaque)
58{
59 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010060 u64 *no_addr = opaque;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040061
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010062 inode->i_ino = (unsigned long)*no_addr;
63 ip->i_no_addr = *no_addr;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040064 return 0;
65}
66
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010067struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
David Teiglandb3b94fa2006-01-16 16:50:04 +000068{
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010069 unsigned long hash = (unsigned long)no_addr;
70 return ilookup5(sb, hash, iget_test, &no_addr);
David Teiglandb3b94fa2006-01-16 16:50:04 +000071}
72
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010073static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
David Teiglandb3b94fa2006-01-16 16:50:04 +000074{
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010075 unsigned long hash = (unsigned long)no_addr;
76 return iget5_locked(sb, hash, iget_test, iget_set, &no_addr);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040077}
78
Benjamin Marzinski7a9f53b2007-09-18 13:33:18 -050079struct gfs2_skip_data {
80 u64 no_addr;
81 int skipped;
82};
83
84static int iget_skip_test(struct inode *inode, void *opaque)
85{
86 struct gfs2_inode *ip = GFS2_I(inode);
87 struct gfs2_skip_data *data = opaque;
88
89 if (ip->i_no_addr == data->no_addr && inode->i_private != NULL){
90 if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)){
91 data->skipped = 1;
92 return 0;
93 }
94 return 1;
95 }
96 return 0;
97}
98
99static int iget_skip_set(struct inode *inode, void *opaque)
100{
101 struct gfs2_inode *ip = GFS2_I(inode);
102 struct gfs2_skip_data *data = opaque;
103
104 if (data->skipped)
105 return 1;
106 inode->i_ino = (unsigned long)(data->no_addr);
107 ip->i_no_addr = data->no_addr;
108 return 0;
109}
110
111static struct inode *gfs2_iget_skip(struct super_block *sb,
112 u64 no_addr)
113{
114 struct gfs2_skip_data data;
115 unsigned long hash = (unsigned long)no_addr;
116
117 data.no_addr = no_addr;
118 data.skipped = 0;
119 return iget5_locked(sb, hash, iget_skip_test, iget_skip_set, &data);
120}
121
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400122/**
Wendy Cheng35dcc522007-06-27 17:07:53 -0400123 * GFS2 lookup code fills in vfs inode contents based on info obtained
124 * from directory entry inside gfs2_inode_lookup(). This has caused issues
125 * with NFS code path since its get_dentry routine doesn't have the relevant
126 * directory entry when gfs2_inode_lookup() is invoked. Part of the code
127 * segment inside gfs2_inode_lookup code needs to get moved around.
128 *
129 * Clean up I_LOCK and I_NEW as well.
130 **/
131
132void gfs2_set_iop(struct inode *inode)
133{
Wendy Chengc97bfe42007-11-29 17:56:51 -0500134 struct gfs2_sbd *sdp = GFS2_SB(inode);
Wendy Cheng35dcc522007-06-27 17:07:53 -0400135 umode_t mode = inode->i_mode;
136
137 if (S_ISREG(mode)) {
138 inode->i_op = &gfs2_file_iops;
Wendy Chengc97bfe42007-11-29 17:56:51 -0500139 if (sdp->sd_args.ar_localflocks)
140 inode->i_fop = &gfs2_file_fops_nolock;
141 else
142 inode->i_fop = &gfs2_file_fops;
Wendy Cheng35dcc522007-06-27 17:07:53 -0400143 } else if (S_ISDIR(mode)) {
144 inode->i_op = &gfs2_dir_iops;
Wendy Chengc97bfe42007-11-29 17:56:51 -0500145 if (sdp->sd_args.ar_localflocks)
146 inode->i_fop = &gfs2_dir_fops_nolock;
147 else
148 inode->i_fop = &gfs2_dir_fops;
Wendy Cheng35dcc522007-06-27 17:07:53 -0400149 } else if (S_ISLNK(mode)) {
150 inode->i_op = &gfs2_symlink_iops;
151 } else {
152 inode->i_op = &gfs2_dev_iops;
153 }
154
155 unlock_new_inode(inode);
156}
157
158/**
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400159 * gfs2_inode_lookup - Lookup an inode
160 * @sb: The super block
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100161 * @no_addr: The inode number
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400162 * @type: The type of the inode
Benjamin Marzinski7a9f53b2007-09-18 13:33:18 -0500163 * @skip_freeing: set this not return an inode if it is currently being freed.
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400164 *
165 * Returns: A VFS inode, or an error
166 */
167
Wendy Chengbb9bcf02007-06-27 17:07:08 -0400168struct inode *gfs2_inode_lookup(struct super_block *sb,
169 unsigned int type,
170 u64 no_addr,
Benjamin Marzinski7a9f53b2007-09-18 13:33:18 -0500171 u64 no_formal_ino, int skip_freeing)
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400172{
Benjamin Marzinski7a9f53b2007-09-18 13:33:18 -0500173 struct inode *inode;
174 struct gfs2_inode *ip;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400175 struct gfs2_glock *io_gl;
176 int error;
177
Benjamin Marzinski7a9f53b2007-09-18 13:33:18 -0500178 if (skip_freeing)
179 inode = gfs2_iget_skip(sb, no_addr);
180 else
181 inode = gfs2_iget(sb, no_addr);
182 ip = GFS2_I(inode);
183
Steven Whitehouse26d83de2006-10-30 16:59:08 -0500184 if (!inode)
185 return ERR_PTR(-ENOBUFS);
186
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400187 if (inode->i_state & I_NEW) {
188 struct gfs2_sbd *sdp = GFS2_SB(inode);
Theodore Ts'obba9dfd2006-09-27 01:50:31 -0700189 inode->i_private = ip;
Wendy Chengbb9bcf02007-06-27 17:07:08 -0400190 ip->i_no_formal_ino = no_formal_ino;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400191
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100192 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400193 if (unlikely(error))
194 goto fail;
195 ip->i_gl->gl_object = ip;
196
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100197 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400198 if (unlikely(error))
199 goto fail_put;
200
Steven Whitehousebfded272006-11-01 16:05:38 -0500201 set_bit(GIF_INVALID, &ip->i_flags);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400202 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
203 if (unlikely(error))
204 goto fail_iopen;
Abhijith Dasd93cfa92007-06-11 08:22:32 +0100205 ip->i_iopen_gh.gh_gl->gl_object = ip;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400206
207 gfs2_glock_put(io_gl);
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100208
Wendy Cheng35dcc522007-06-27 17:07:53 -0400209 if ((type == DT_UNKNOWN) && (no_formal_ino == 0))
210 goto gfs2_nfsbypass;
211
212 inode->i_mode = DT2IF(type);
213
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100214 /*
215 * We must read the inode in order to work out its type in
216 * this case. Note that this doesn't happen often as we normally
217 * know the type beforehand. This code path only occurs during
218 * unlinked inode recovery (where it is safe to do this glock,
219 * which is not true in the general case).
220 */
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100221 if (type == DT_UNKNOWN) {
222 struct gfs2_holder gh;
223 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
224 if (unlikely(error))
225 goto fail_glock;
226 /* Inode is now uptodate */
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100227 gfs2_glock_dq_uninit(&gh);
228 }
229
Wendy Cheng35dcc522007-06-27 17:07:53 -0400230 gfs2_set_iop(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000231 }
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400232
Wendy Cheng35dcc522007-06-27 17:07:53 -0400233gfs2_nfsbypass:
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400234 return inode;
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100235fail_glock:
236 gfs2_glock_dq(&ip->i_iopen_gh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400237fail_iopen:
238 gfs2_glock_put(io_gl);
239fail_put:
240 ip->i_gl->gl_object = NULL;
241 gfs2_glock_put(ip->i_gl);
242fail:
243 iput(inode);
244 return ERR_PTR(error);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000245}
246
Steven Whitehouseaf339c02006-11-01 10:34:15 -0500247static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
Steven Whitehouseea744d02006-10-31 15:28:00 -0500248{
249 struct gfs2_dinode_host *di = &ip->i_di;
250 const struct gfs2_dinode *str = buf;
251
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100252 if (ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)) {
Steven Whitehouseaf339c02006-11-01 10:34:15 -0500253 if (gfs2_consist_inode(ip))
254 gfs2_dinode_print(ip);
255 return -EIO;
256 }
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100257 ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500258 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
Steven Whitehousee7f14f42006-10-31 21:45:08 -0500259 ip->i_inode.i_rdev = 0;
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500260 switch (ip->i_inode.i_mode & S_IFMT) {
Steven Whitehousee7f14f42006-10-31 21:45:08 -0500261 case S_IFBLK:
262 case S_IFCHR:
263 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
264 be32_to_cpu(str->di_minor));
265 break;
266 };
267
Steven Whitehouse2933f922006-11-01 13:23:29 -0500268 ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
269 ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
Steven Whitehouse4f561102006-11-01 14:04:17 -0500270 /*
271 * We will need to review setting the nlink count here in the
272 * light of the forthcoming ro bind mount work. This is a reminder
273 * to do that.
274 */
275 ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
Steven Whitehouseea744d02006-10-31 15:28:00 -0500276 di->di_size = be64_to_cpu(str->di_size);
Steven Whitehouse9e2dbda2006-11-08 15:45:46 -0500277 i_size_write(&ip->i_inode, di->di_size);
Steven Whitehouseea744d02006-10-31 15:28:00 -0500278 di->di_blocks = be64_to_cpu(str->di_blocks);
Steven Whitehouse9e2dbda2006-11-08 15:45:46 -0500279 gfs2_set_inode_blocks(&ip->i_inode);
Steven Whitehouse1a7b1ee2006-11-01 14:35:17 -0500280 ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100281 ip->i_inode.i_atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
Steven Whitehouse1a7b1ee2006-11-01 14:35:17 -0500282 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100283 ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
Steven Whitehouse1a7b1ee2006-11-01 14:35:17 -0500284 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100285 ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
Steven Whitehouseea744d02006-10-31 15:28:00 -0500286
287 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
288 di->di_goal_data = be64_to_cpu(str->di_goal_data);
289 di->di_generation = be64_to_cpu(str->di_generation);
290
291 di->di_flags = be32_to_cpu(str->di_flags);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500292 gfs2_set_inode_flags(&ip->i_inode);
Steven Whitehouseea744d02006-10-31 15:28:00 -0500293 di->di_height = be16_to_cpu(str->di_height);
294
295 di->di_depth = be16_to_cpu(str->di_depth);
296 di->di_entries = be32_to_cpu(str->di_entries);
297
298 di->di_eattr = be64_to_cpu(str->di_eattr);
Steven Whitehouse55610932007-10-17 08:47:38 +0100299 if (S_ISREG(ip->i_inode.i_mode))
300 gfs2_set_aops(&ip->i_inode);
301
Steven Whitehouseaf339c02006-11-01 10:34:15 -0500302 return 0;
Steven Whitehouseea744d02006-10-31 15:28:00 -0500303}
304
David Teiglandb3b94fa2006-01-16 16:50:04 +0000305/**
306 * gfs2_inode_refresh - Refresh the incore copy of the dinode
307 * @ip: The GFS2 inode
308 *
309 * Returns: errno
310 */
311
312int gfs2_inode_refresh(struct gfs2_inode *ip)
313{
314 struct buffer_head *dibh;
315 int error;
316
317 error = gfs2_meta_inode_buffer(ip, &dibh);
318 if (error)
319 return error;
320
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400321 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000322 brelse(dibh);
323 return -EIO;
324 }
325
Steven Whitehouseaf339c02006-11-01 10:34:15 -0500326 error = gfs2_dinode_in(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000327 brelse(dibh);
Steven Whitehousebfded272006-11-01 16:05:38 -0500328 clear_bit(GIF_INVALID, &ip->i_flags);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000329
Steven Whitehouseaf339c02006-11-01 10:34:15 -0500330 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000331}
332
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400333int gfs2_dinode_dealloc(struct gfs2_inode *ip)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000334{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400335 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000336 struct gfs2_alloc *al;
337 struct gfs2_rgrpd *rgd;
338 int error;
339
340 if (ip->i_di.di_blocks != 1) {
341 if (gfs2_consist_inode(ip))
Steven Whitehouse4cc14f02006-10-31 19:00:24 -0500342 gfs2_dinode_print(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000343 return -EIO;
344 }
345
346 al = gfs2_alloc_get(ip);
347
348 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
349 if (error)
350 goto out;
351
352 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
353 if (error)
354 goto out_qs;
355
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100356 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000357 if (!rgd) {
358 gfs2_consist_inode(ip);
359 error = -EIO;
360 goto out_rindex_relse;
361 }
362
363 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
364 &al->al_rgd_gh);
365 if (error)
366 goto out_rindex_relse;
367
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400368 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000369 if (error)
370 goto out_rg_gunlock;
371
Steven Whitehouse2bcd6102007-11-08 14:25:12 +0000372 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
373 set_bit(GLF_LFLUSH, &ip->i_gl->gl_flags);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000374
375 gfs2_free_di(rgd, ip);
376
David Teiglandb3b94fa2006-01-16 16:50:04 +0000377 gfs2_trans_end(sdp);
378 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
379
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400380out_rg_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000381 gfs2_glock_dq_uninit(&al->al_rgd_gh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400382out_rindex_relse:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000383 gfs2_glock_dq_uninit(&al->al_ri_gh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400384out_qs:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000385 gfs2_quota_unhold(ip);
Steven Whitehouse36327522006-04-28 10:46:21 -0400386out:
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400387 gfs2_alloc_put(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000388 return error;
389}
390
391/**
S. Wendy Cheng87d21e02007-01-18 16:07:03 -0500392 * gfs2_change_nlink - Change nlink count on inode
David Teiglandb3b94fa2006-01-16 16:50:04 +0000393 * @ip: The GFS2 inode
394 * @diff: The change in the nlink count required
395 *
396 * Returns: errno
397 */
S. Wendy Cheng87d21e02007-01-18 16:07:03 -0500398int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000399{
400 struct buffer_head *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -0400401 u32 nlink;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000402 int error;
403
Steven Whitehouse4f561102006-11-01 14:04:17 -0500404 BUG_ON(diff != 1 && diff != -1);
405 nlink = ip->i_inode.i_nlink + diff;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000406
407 /* If we are reducing the nlink count, but the new value ends up being
408 bigger than the old one, we must have underflowed. */
Steven Whitehouse4f561102006-11-01 14:04:17 -0500409 if (diff < 0 && nlink > ip->i_inode.i_nlink) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000410 if (gfs2_consist_inode(ip))
Steven Whitehouse4cc14f02006-10-31 19:00:24 -0500411 gfs2_dinode_print(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000412 return -EIO;
413 }
414
415 error = gfs2_meta_inode_buffer(ip, &dibh);
416 if (error)
417 return error;
418
Steven Whitehouse4f561102006-11-01 14:04:17 -0500419 if (diff > 0)
420 inc_nlink(&ip->i_inode);
421 else
422 drop_nlink(&ip->i_inode);
423
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100424 ip->i_inode.i_ctime = CURRENT_TIME;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000425
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000426 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500427 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000428 brelse(dibh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400429 mark_inode_dirty(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000430
S. Wendy Cheng87d21e02007-01-18 16:07:03 -0500431 if (ip->i_inode.i_nlink == 0)
Russell Cattelanddee7602007-01-29 17:13:44 -0600432 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
S. Wendy Cheng87d21e02007-01-18 16:07:03 -0500433
S. Wendy Cheng55098262007-01-18 15:56:34 -0500434 return error;
435}
436
Steven Whitehousec7526662006-03-20 12:30:04 -0500437struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
438{
439 struct qstr qstr;
Russell Cattelan6c93fd12007-01-08 17:47:51 -0600440 struct inode *inode;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500441 gfs2_str2qstr(&qstr, name);
Russell Cattelan6c93fd12007-01-08 17:47:51 -0600442 inode = gfs2_lookupi(dip, &qstr, 1, NULL);
443 /* gfs2_lookupi has inconsistent callers: vfs
444 * related routines expect NULL for no entry found,
445 * gfs2_lookup_simple callers expect ENOENT
446 * and do not check for NULL.
447 */
448 if (inode == NULL)
449 return ERR_PTR(-ENOENT);
450 else
451 return inode;
Steven Whitehousec7526662006-03-20 12:30:04 -0500452}
453
454
David Teiglandb3b94fa2006-01-16 16:50:04 +0000455/**
456 * gfs2_lookupi - Look up a filename in a directory and return its inode
457 * @d_gh: An initialized holder for the directory glock
458 * @name: The name of the inode to look for
459 * @is_root: If 1, ignore the caller's permissions
460 * @i_gh: An uninitialized holder for the new inode glock
461 *
Steven Whitehoused7c103d2007-01-25 17:14:59 +0000462 * This can be called via the VFS filldir function when NFS is doing
463 * a readdirplus and the inode which its intending to stat isn't
464 * already in cache. In this case we must not take the directory glock
465 * again, since the readdir call will have already taken that lock.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000466 *
467 * Returns: errno
468 */
469
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400470struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
471 int is_root, struct nameidata *nd)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000472{
Steven Whitehousec9fd4302006-03-01 15:31:02 -0500473 struct super_block *sb = dir->i_sb;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400474 struct gfs2_inode *dip = GFS2_I(dir);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000475 struct gfs2_holder d_gh;
akpm@linux-foundation.org037bcbb2007-06-08 16:42:14 -0700476 int error = 0;
Steven Whitehousec7526662006-03-20 12:30:04 -0500477 struct inode *inode = NULL;
Steven Whitehoused7c103d2007-01-25 17:14:59 +0000478 int unlock = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000479
480 if (!name->len || name->len > GFS2_FNAMESIZE)
Steven Whitehousec7526662006-03-20 12:30:04 -0500481 return ERR_PTR(-ENAMETOOLONG);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000482
Steven Whitehousec7526662006-03-20 12:30:04 -0500483 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
484 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
485 dir == sb->s_root->d_inode)) {
Steven Whitehouse320dd102006-05-18 16:25:27 -0400486 igrab(dir);
487 return dir;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000488 }
489
Steven Whitehoused7c103d2007-01-25 17:14:59 +0000490 if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) {
491 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
492 if (error)
493 return ERR_PTR(error);
494 unlock = 1;
495 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000496
497 if (!is_root) {
Steven Whitehousefaf450e2006-06-22 10:59:10 -0400498 error = permission(dir, MAY_EXEC, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000499 if (error)
500 goto out;
501 }
502
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100503 inode = gfs2_dir_search(dir, name);
504 if (IS_ERR(inode))
505 error = PTR_ERR(inode);
Steven Whitehouse7359a192006-02-13 12:27:43 +0000506out:
Steven Whitehoused7c103d2007-01-25 17:14:59 +0000507 if (unlock)
508 gfs2_glock_dq_uninit(&d_gh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500509 if (error == -ENOENT)
510 return NULL;
Steven Whitehoused7c103d2007-01-25 17:14:59 +0000511 return inode ? inode : ERR_PTR(error);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000512}
513
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100514static void gfs2_inum_range_in(struct gfs2_inum_range_host *ir, const void *buf)
515{
516 const struct gfs2_inum_range *str = buf;
517
518 ir->ir_start = be64_to_cpu(str->ir_start);
519 ir->ir_length = be64_to_cpu(str->ir_length);
520}
521
522static void gfs2_inum_range_out(const struct gfs2_inum_range_host *ir, void *buf)
523{
524 struct gfs2_inum_range *str = buf;
525
526 str->ir_start = cpu_to_be64(ir->ir_start);
527 str->ir_length = cpu_to_be64(ir->ir_length);
528}
529
Steven Whitehousecd915492006-09-04 12:49:07 -0400530static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000531{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400532 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000533 struct buffer_head *bh;
Al Viroe6972642006-10-13 21:29:46 -0400534 struct gfs2_inum_range_host ir;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000535 int error;
536
537 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
538 if (error)
539 return error;
Steven Whitehousef55ab262006-02-21 12:51:39 +0000540 mutex_lock(&sdp->sd_inum_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000541
542 error = gfs2_meta_inode_buffer(ip, &bh);
543 if (error) {
Steven Whitehousef55ab262006-02-21 12:51:39 +0000544 mutex_unlock(&sdp->sd_inum_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000545 gfs2_trans_end(sdp);
546 return error;
547 }
548
549 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
550
551 if (ir.ir_length) {
552 *formal_ino = ir.ir_start++;
553 ir.ir_length--;
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000554 gfs2_trans_add_bh(ip->i_gl, bh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000555 gfs2_inum_range_out(&ir,
556 bh->b_data + sizeof(struct gfs2_dinode));
557 brelse(bh);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000558 mutex_unlock(&sdp->sd_inum_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000559 gfs2_trans_end(sdp);
560 return 0;
561 }
562
563 brelse(bh);
564
Steven Whitehousef55ab262006-02-21 12:51:39 +0000565 mutex_unlock(&sdp->sd_inum_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000566 gfs2_trans_end(sdp);
567
568 return 1;
569}
570
Steven Whitehousecd915492006-09-04 12:49:07 -0400571static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000572{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400573 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
574 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000575 struct gfs2_holder gh;
576 struct buffer_head *bh;
Al Viroe6972642006-10-13 21:29:46 -0400577 struct gfs2_inum_range_host ir;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000578 int error;
579
580 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
581 if (error)
582 return error;
583
584 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
585 if (error)
586 goto out;
Steven Whitehousef55ab262006-02-21 12:51:39 +0000587 mutex_lock(&sdp->sd_inum_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000588
589 error = gfs2_meta_inode_buffer(ip, &bh);
590 if (error)
591 goto out_end_trans;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400592
David Teiglandb3b94fa2006-01-16 16:50:04 +0000593 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
594
595 if (!ir.ir_length) {
596 struct buffer_head *m_bh;
Steven Whitehousecd915492006-09-04 12:49:07 -0400597 u64 x, y;
Al Virob44b84d2006-10-14 10:46:30 -0400598 __be64 z;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000599
600 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
601 if (error)
602 goto out_brelse;
603
Al Virob44b84d2006-10-14 10:46:30 -0400604 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
605 x = y = be64_to_cpu(z);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000606 ir.ir_start = x;
607 ir.ir_length = GFS2_INUM_QUANTUM;
608 x += GFS2_INUM_QUANTUM;
609 if (x < y)
610 gfs2_consist_inode(m_ip);
Al Virob44b84d2006-10-14 10:46:30 -0400611 z = cpu_to_be64(x);
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000612 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
Al Virob44b84d2006-10-14 10:46:30 -0400613 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000614
615 brelse(m_bh);
616 }
617
618 *formal_ino = ir.ir_start++;
619 ir.ir_length--;
620
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000621 gfs2_trans_add_bh(ip->i_gl, bh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000622 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
623
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400624out_brelse:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000625 brelse(bh);
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400626out_end_trans:
Steven Whitehousef55ab262006-02-21 12:51:39 +0000627 mutex_unlock(&sdp->sd_inum_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000628 gfs2_trans_end(sdp);
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400629out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000630 gfs2_glock_dq_uninit(&gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000631 return error;
632}
633
Steven Whitehousecd915492006-09-04 12:49:07 -0400634static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000635{
636 int error;
637
638 error = pick_formal_ino_1(sdp, inum);
639 if (error <= 0)
640 return error;
641
642 error = pick_formal_ino_2(sdp, inum);
643
644 return error;
645}
646
647/**
648 * create_ok - OK to create a new on-disk inode here?
649 * @dip: Directory in which dinode is to be created
650 * @name: Name of new dinode
651 * @mode:
652 *
653 * Returns: errno
654 */
655
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400656static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000657 unsigned int mode)
658{
659 int error;
660
Steven Whitehousefaf450e2006-06-22 10:59:10 -0400661 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000662 if (error)
663 return error;
664
665 /* Don't create entries in an unlinked directory */
Steven Whitehouse4f561102006-11-01 14:04:17 -0500666 if (!dip->i_inode.i_nlink)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000667 return -EPERM;
668
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100669 error = gfs2_dir_check(&dip->i_inode, name, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000670 switch (error) {
671 case -ENOENT:
672 error = 0;
673 break;
674 case 0:
675 return -EEXIST;
676 default:
677 return error;
678 }
679
Steven Whitehousecd915492006-09-04 12:49:07 -0400680 if (dip->i_di.di_entries == (u32)-1)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000681 return -EFBIG;
Steven Whitehouse4f561102006-11-01 14:04:17 -0500682 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000683 return -EMLINK;
684
685 return 0;
686}
687
688static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
689 unsigned int *uid, unsigned int *gid)
690{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400691 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
Steven Whitehouse2933f922006-11-01 13:23:29 -0500692 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000693 if (S_ISDIR(*mode))
694 *mode |= S_ISUID;
Steven Whitehouse2933f922006-11-01 13:23:29 -0500695 else if (dip->i_inode.i_uid != current->fsuid)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000696 *mode &= ~07111;
Steven Whitehouse2933f922006-11-01 13:23:29 -0500697 *uid = dip->i_inode.i_uid;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000698 } else
699 *uid = current->fsuid;
700
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500701 if (dip->i_inode.i_mode & S_ISGID) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000702 if (S_ISDIR(*mode))
703 *mode |= S_ISGID;
Steven Whitehouse2933f922006-11-01 13:23:29 -0500704 *gid = dip->i_inode.i_gid;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000705 } else
706 *gid = current->fsgid;
707}
708
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100709static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000710{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400711 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000712 int error;
713
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000714 if (gfs2_alloc_get(dip) == NULL)
715 return -ENOMEM;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000716
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000717 dip->i_alloc->al_requested = RES_DINODE;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000718 error = gfs2_inplace_reserve(dip);
719 if (error)
720 goto out;
721
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400722 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000723 if (error)
724 goto out_ipreserv;
725
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100726 *no_addr = gfs2_alloc_di(dip, generation);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000727
728 gfs2_trans_end(sdp);
729
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400730out_ipreserv:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000731 gfs2_inplace_release(dip);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400732out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000733 gfs2_alloc_put(dip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000734 return error;
735}
736
737/**
738 * init_dinode - Fill in a new dinode structure
739 * @dip: the directory this inode is being created in
740 * @gl: The glock covering the new inode
741 * @inum: the inode number
742 * @mode: the file permissions
743 * @uid:
744 * @gid:
745 *
746 */
747
748static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
Al Viro629a21e2006-10-13 22:51:24 -0400749 const struct gfs2_inum_host *inum, unsigned int mode,
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400750 unsigned int uid, unsigned int gid,
Wendy Chenge9bd2b32007-08-24 09:15:01 -0400751 const u64 *generation, dev_t dev, struct buffer_head **bhp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000752{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400753 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000754 struct gfs2_dinode *di;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000755 struct buffer_head *dibh;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100756 struct timespec tv = CURRENT_TIME;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000757
758 dibh = gfs2_meta_new(gl, inum->no_addr);
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000759 gfs2_trans_add_bh(gl, dibh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000760 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
761 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000762 di = (struct gfs2_dinode *)dibh->b_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000763
Steven Whitehouse2442a092006-01-30 11:49:32 +0000764 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
765 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000766 di->di_mode = cpu_to_be32(mode);
767 di->di_uid = cpu_to_be32(uid);
768 di->di_gid = cpu_to_be32(gid);
Steven Whitehouse294caaa2006-11-02 11:59:28 -0500769 di->di_nlink = 0;
770 di->di_size = 0;
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000771 di->di_blocks = cpu_to_be64(1);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100772 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
Steven Whitehousee7f14f42006-10-31 21:45:08 -0500773 di->di_major = cpu_to_be32(MAJOR(dev));
774 di->di_minor = cpu_to_be32(MINOR(dev));
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000775 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400776 di->di_generation = cpu_to_be64(*generation);
Steven Whitehouse294caaa2006-11-02 11:59:28 -0500777 di->di_flags = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000778
779 if (S_ISREG(mode)) {
780 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
781 gfs2_tune_get(sdp, gt_new_files_jdata))
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000782 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000783 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
784 gfs2_tune_get(sdp, gt_new_files_directio))
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000785 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000786 } else if (S_ISDIR(mode)) {
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500787 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
788 GFS2_DIF_INHERIT_DIRECTIO);
789 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
790 GFS2_DIF_INHERIT_JDATA);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000791 }
792
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000793 di->__pad1 = 0;
Steven Whitehousea9583c72006-11-01 20:09:14 -0500794 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
Steven Whitehouse294caaa2006-11-02 11:59:28 -0500795 di->di_height = 0;
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000796 di->__pad2 = 0;
797 di->__pad3 = 0;
Steven Whitehouse294caaa2006-11-02 11:59:28 -0500798 di->di_depth = 0;
799 di->di_entries = 0;
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000800 memset(&di->__pad4, 0, sizeof(di->__pad4));
Steven Whitehouse294caaa2006-11-02 11:59:28 -0500801 di->di_eattr = 0;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100802 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
803 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
804 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000805 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
Wendy Chenge9bd2b32007-08-24 09:15:01 -0400806
807 set_buffer_uptodate(dibh);
Steven Whitehouseb96ca4f2006-01-18 10:57:10 +0000808
Wendy Chenge9bd2b32007-08-24 09:15:01 -0400809 *bhp = dibh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000810}
811
812static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
Al Viro629a21e2006-10-13 22:51:24 -0400813 unsigned int mode, const struct gfs2_inum_host *inum,
Wendy Chenge9bd2b32007-08-24 09:15:01 -0400814 const u64 *generation, dev_t dev, struct buffer_head **bhp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000815{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400816 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000817 unsigned int uid, gid;
818 int error;
819
820 munge_mode_uid_gid(dip, &mode, &uid, &gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000821 gfs2_alloc_get(dip);
822
823 error = gfs2_quota_lock(dip, uid, gid);
824 if (error)
825 goto out;
826
827 error = gfs2_quota_check(dip, uid, gid);
828 if (error)
829 goto out_quota;
830
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400831 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000832 if (error)
833 goto out_quota;
834
Wendy Chenge9bd2b32007-08-24 09:15:01 -0400835 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000836 gfs2_quota_change(dip, +1, uid, gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000837 gfs2_trans_end(sdp);
838
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400839out_quota:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000840 gfs2_quota_unlock(dip);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400841out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000842 gfs2_alloc_put(dip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000843 return error;
844}
845
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400846static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
847 struct gfs2_inode *ip)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000848{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400849 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000850 struct gfs2_alloc *al;
851 int alloc_required;
852 struct buffer_head *dibh;
853 int error;
854
855 al = gfs2_alloc_get(dip);
856
857 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
858 if (error)
859 goto fail;
860
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400861 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
Steven Whitehousec7526662006-03-20 12:30:04 -0500862 if (alloc_required < 0)
Bob Peterson1b8177e2008-01-19 21:50:24 -0600863 goto fail_quota_locks;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000864 if (alloc_required) {
Steven Whitehouse2933f922006-11-01 13:23:29 -0500865 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000866 if (error)
867 goto fail_quota_locks;
868
869 al->al_requested = sdp->sd_max_dirres;
870
871 error = gfs2_inplace_reserve(dip);
872 if (error)
873 goto fail_quota_locks;
874
Steven Whitehouse320dd102006-05-18 16:25:27 -0400875 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100876 al->al_rgd->rd_length +
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400877 2 * RES_DINODE +
David Teiglandb3b94fa2006-01-16 16:50:04 +0000878 RES_STATFS + RES_QUOTA, 0);
879 if (error)
880 goto fail_ipreserv;
881 } else {
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400882 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000883 if (error)
884 goto fail_quota_locks;
885 }
886
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100887 error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000888 if (error)
889 goto fail_end_trans;
890
891 error = gfs2_meta_inode_buffer(ip, &dibh);
892 if (error)
893 goto fail_end_trans;
Steven Whitehouse4f561102006-11-01 14:04:17 -0500894 ip->i_inode.i_nlink = 1;
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000895 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500896 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000897 brelse(dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000898 return 0;
899
Steven Whitehouse320dd102006-05-18 16:25:27 -0400900fail_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000901 gfs2_trans_end(sdp);
902
Steven Whitehouse320dd102006-05-18 16:25:27 -0400903fail_ipreserv:
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000904 if (dip->i_alloc->al_rgd)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000905 gfs2_inplace_release(dip);
906
Steven Whitehouse320dd102006-05-18 16:25:27 -0400907fail_quota_locks:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000908 gfs2_quota_unlock(dip);
909
Steven Whitehouse320dd102006-05-18 16:25:27 -0400910fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000911 gfs2_alloc_put(dip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000912 return error;
913}
914
Ryan O'Harafcb47e02006-10-03 11:57:35 -0400915static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
916{
917 int err;
918 size_t len;
919 void *value;
920 char *name;
921 struct gfs2_ea_request er;
922
923 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
924 &name, &value, &len);
925
926 if (err) {
927 if (err == -EOPNOTSUPP)
928 return 0;
929 return err;
930 }
931
932 memset(&er, 0, sizeof(struct gfs2_ea_request));
933
934 er.er_type = GFS2_EATYPE_SECURITY;
935 er.er_name = name;
936 er.er_data = value;
937 er.er_name_len = strlen(name);
938 er.er_data_len = len;
939
940 err = gfs2_ea_set_i(ip, &er);
941
942 kfree(value);
943 kfree(name);
944
945 return err;
946}
947
David Teiglandb3b94fa2006-01-16 16:50:04 +0000948/**
949 * gfs2_createi - Create a new inode
950 * @ghs: An array of two holders
951 * @name: The name of the new file
952 * @mode: the permissions on the new inode
953 *
954 * @ghs[0] is an initialized holder for the directory
955 * @ghs[1] is the holder for the inode lock
956 *
Steven Whitehouse7359a192006-02-13 12:27:43 +0000957 * If the return value is not NULL, the glocks on both the directory and the new
David Teiglandb3b94fa2006-01-16 16:50:04 +0000958 * file are held. A transaction has been started and an inplace reservation
959 * is held, as well.
960 *
Steven Whitehouse7359a192006-02-13 12:27:43 +0000961 * Returns: An inode
David Teiglandb3b94fa2006-01-16 16:50:04 +0000962 */
963
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400964struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
Steven Whitehousee7f14f42006-10-31 21:45:08 -0500965 unsigned int mode, dev_t dev)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000966{
Steven Whitehousee1cc8602007-06-07 11:47:52 +0100967 struct inode *inode = NULL;
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500968 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400969 struct inode *dir = &dip->i_inode;
970 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100971 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
David Teiglandb3b94fa2006-01-16 16:50:04 +0000972 int error;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400973 u64 generation;
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100974 struct buffer_head *bh = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000975
976 if (!name->len || name->len > GFS2_FNAMESIZE)
Steven Whitehouse7359a192006-02-13 12:27:43 +0000977 return ERR_PTR(-ENAMETOOLONG);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000978
David Teiglandb3b94fa2006-01-16 16:50:04 +0000979 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
980 error = gfs2_glock_nq(ghs);
981 if (error)
982 goto fail;
983
984 error = create_ok(dip, name, mode);
985 if (error)
986 goto fail_gunlock;
987
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400988 error = pick_formal_ino(sdp, &inum.no_formal_ino);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000989 if (error)
990 goto fail_gunlock;
991
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100992 error = alloc_dinode(dip, &inum.no_addr, &generation);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000993 if (error)
994 goto fail_gunlock;
995
Steven Whitehouse28626e22006-11-22 11:13:21 -0500996 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
997 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
998 if (error)
999 goto fail_gunlock;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001000
Wendy Chenge9bd2b32007-08-24 09:15:01 -04001001 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001002 if (error)
1003 goto fail_gunlock2;
1004
Wendy Chengbb9bcf02007-06-27 17:07:08 -04001005 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode),
1006 inum.no_addr,
Benjamin Marzinski7a9f53b2007-09-18 13:33:18 -05001007 inum.no_formal_ino, 0);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001008 if (IS_ERR(inode))
David Teiglandb3b94fa2006-01-16 16:50:04 +00001009 goto fail_gunlock2;
1010
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001011 error = gfs2_inode_refresh(GFS2_I(inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001012 if (error)
Steven Whitehousee1cc8602007-06-07 11:47:52 +01001013 goto fail_gunlock2;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001014
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001015 error = gfs2_acl_create(dip, GFS2_I(inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001016 if (error)
Steven Whitehousee1cc8602007-06-07 11:47:52 +01001017 goto fail_gunlock2;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001018
Ryan O'Harafcb47e02006-10-03 11:57:35 -04001019 error = gfs2_security_init(dip, GFS2_I(inode));
1020 if (error)
Steven Whitehousee1cc8602007-06-07 11:47:52 +01001021 goto fail_gunlock2;
Ryan O'Harafcb47e02006-10-03 11:57:35 -04001022
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001023 error = link_dinode(dip, name, GFS2_I(inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001024 if (error)
Steven Whitehousee1cc8602007-06-07 11:47:52 +01001025 goto fail_gunlock2;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001026
Steven Whitehousef91a0d32007-10-15 16:29:05 +01001027 if (bh)
1028 brelse(bh);
Steven Whitehouse7359a192006-02-13 12:27:43 +00001029 if (!inode)
1030 return ERR_PTR(-ENOMEM);
1031 return inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001032
Steven Whitehouse320dd102006-05-18 16:25:27 -04001033fail_gunlock2:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001034 gfs2_glock_dq_uninit(ghs + 1);
Steven Whitehousee1cc8602007-06-07 11:47:52 +01001035 if (inode)
1036 iput(inode);
Steven Whitehouse320dd102006-05-18 16:25:27 -04001037fail_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001038 gfs2_glock_dq(ghs);
Steven Whitehouse320dd102006-05-18 16:25:27 -04001039fail:
Steven Whitehousef91a0d32007-10-15 16:29:05 +01001040 if (bh)
1041 brelse(bh);
Steven Whitehouse7359a192006-02-13 12:27:43 +00001042 return ERR_PTR(error);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001043}
1044
1045/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001046 * gfs2_rmdiri - Remove a directory
1047 * @dip: The parent directory of the directory to be removed
1048 * @name: The name of the directory to be removed
1049 * @ip: The GFS2 inode of the directory to be removed
1050 *
1051 * Assumes Glocks on dip and ip are held
1052 *
1053 * Returns: errno
1054 */
1055
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001056int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
1057 struct gfs2_inode *ip)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001058{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001059 struct qstr dotname;
1060 int error;
1061
1062 if (ip->i_di.di_entries != 2) {
1063 if (gfs2_consist_inode(ip))
Steven Whitehouse4cc14f02006-10-31 19:00:24 -05001064 gfs2_dinode_print(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001065 return -EIO;
1066 }
1067
1068 error = gfs2_dir_del(dip, name);
1069 if (error)
1070 return error;
1071
1072 error = gfs2_change_nlink(dip, -1);
1073 if (error)
1074 return error;
1075
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001076 gfs2_str2qstr(&dotname, ".");
David Teiglandb3b94fa2006-01-16 16:50:04 +00001077 error = gfs2_dir_del(ip, &dotname);
1078 if (error)
1079 return error;
1080
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001081 gfs2_str2qstr(&dotname, "..");
David Teiglandb3b94fa2006-01-16 16:50:04 +00001082 error = gfs2_dir_del(ip, &dotname);
1083 if (error)
1084 return error;
1085
Steven Whitehouse4f561102006-11-01 14:04:17 -05001086 /* It looks odd, but it really should be done twice */
1087 error = gfs2_change_nlink(ip, -1);
1088 if (error)
1089 return error;
1090
1091 error = gfs2_change_nlink(ip, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001092 if (error)
1093 return error;
1094
David Teiglandb3b94fa2006-01-16 16:50:04 +00001095 return error;
1096}
1097
1098/*
1099 * gfs2_unlink_ok - check to see that a inode is still in a directory
1100 * @dip: the directory
1101 * @name: the name of the file
1102 * @ip: the inode
1103 *
1104 * Assumes that the lock on (at least) @dip is held.
1105 *
1106 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1107 */
1108
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001109int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001110 const struct gfs2_inode *ip)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001111{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001112 int error;
1113
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001114 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
David Teiglandb3b94fa2006-01-16 16:50:04 +00001115 return -EPERM;
1116
Steven Whitehouseb60623c2006-11-01 12:22:46 -05001117 if ((dip->i_inode.i_mode & S_ISVTX) &&
Steven Whitehouse2933f922006-11-01 13:23:29 -05001118 dip->i_inode.i_uid != current->fsuid &&
1119 ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
David Teiglandb3b94fa2006-01-16 16:50:04 +00001120 return -EPERM;
1121
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001122 if (IS_APPEND(&dip->i_inode))
David Teiglandb3b94fa2006-01-16 16:50:04 +00001123 return -EPERM;
1124
Steven Whitehousefaf450e2006-06-22 10:59:10 -04001125 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001126 if (error)
1127 return error;
1128
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001129 error = gfs2_dir_check(&dip->i_inode, name, ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001130 if (error)
1131 return error;
1132
David Teiglandb3b94fa2006-01-16 16:50:04 +00001133 return 0;
1134}
1135
1136/*
1137 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1138 * @this: move this
1139 * @to: to here
1140 *
1141 * Follow @to back to the root and make sure we don't encounter @this
1142 * Assumes we already hold the rename lock.
1143 *
1144 * Returns: errno
1145 */
1146
1147int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1148{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001149 struct inode *dir = &to->i_inode;
Steven Whitehousec9fd4302006-03-01 15:31:02 -05001150 struct super_block *sb = dir->i_sb;
Steven Whitehouse7359a192006-02-13 12:27:43 +00001151 struct inode *tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001152 struct qstr dotdot;
1153 int error = 0;
1154
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001155 gfs2_str2qstr(&dotdot, "..");
David Teiglandb3b94fa2006-01-16 16:50:04 +00001156
Steven Whitehouse7359a192006-02-13 12:27:43 +00001157 igrab(dir);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001158
1159 for (;;) {
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001160 if (dir == &this->i_inode) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001161 error = -EINVAL;
1162 break;
1163 }
Steven Whitehousec9fd4302006-03-01 15:31:02 -05001164 if (dir == sb->s_root->d_inode) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001165 error = 0;
1166 break;
1167 }
1168
Steven Whitehousec7526662006-03-20 12:30:04 -05001169 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1170 if (IS_ERR(tmp)) {
1171 error = PTR_ERR(tmp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001172 break;
Steven Whitehousec7526662006-03-20 12:30:04 -05001173 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001174
Steven Whitehouse7359a192006-02-13 12:27:43 +00001175 iput(dir);
1176 dir = tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001177 }
1178
Steven Whitehouse7359a192006-02-13 12:27:43 +00001179 iput(dir);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001180
1181 return error;
1182}
1183
1184/**
1185 * gfs2_readlinki - return the contents of a symlink
1186 * @ip: the symlink's inode
1187 * @buf: a pointer to the buffer to be filled
1188 * @len: a pointer to the length of @buf
1189 *
1190 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1191 * to be freed by the caller.
1192 *
1193 * Returns: errno
1194 */
1195
1196int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1197{
1198 struct gfs2_holder i_gh;
1199 struct buffer_head *dibh;
1200 unsigned int x;
1201 int error;
1202
1203 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1204 error = gfs2_glock_nq_atime(&i_gh);
1205 if (error) {
1206 gfs2_holder_uninit(&i_gh);
1207 return error;
1208 }
1209
1210 if (!ip->i_di.di_size) {
1211 gfs2_consist_inode(ip);
1212 error = -EIO;
1213 goto out;
1214 }
1215
1216 error = gfs2_meta_inode_buffer(ip, &dibh);
1217 if (error)
1218 goto out;
1219
1220 x = ip->i_di.di_size + 1;
1221 if (x > *len) {
1222 *buf = kmalloc(x, GFP_KERNEL);
1223 if (!*buf) {
1224 error = -ENOMEM;
1225 goto out_brelse;
1226 }
1227 }
1228
1229 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1230 *len = x;
1231
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001232out_brelse:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001233 brelse(dibh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001234out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001235 gfs2_glock_dq_uninit(&i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001236 return error;
1237}
1238
1239/**
1240 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1241 * conditionally update the inode's atime
1242 * @gh: the holder to acquire
1243 *
1244 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1245 * Update if the difference between the current time and the inode's current
1246 * atime is greater than an interval specified at mount.
1247 *
1248 * Returns: errno
1249 */
1250
1251int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1252{
1253 struct gfs2_glock *gl = gh->gh_gl;
1254 struct gfs2_sbd *sdp = gl->gl_sbd;
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001255 struct gfs2_inode *ip = gl->gl_object;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001256 s64 quantum = gfs2_tune_get(sdp, gt_atime_quantum);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001257 unsigned int state;
1258 int flags;
1259 int error;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001260 struct timespec tv = CURRENT_TIME;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001261
1262 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1263 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1264 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1265 return -EINVAL;
1266
1267 state = gh->gh_state;
1268 flags = gh->gh_flags;
1269
1270 error = gfs2_glock_nq(gh);
1271 if (error)
1272 return error;
1273
1274 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1275 (sdp->sd_vfs->s_flags & MS_RDONLY))
1276 return 0;
1277
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001278 if (tv.tv_sec - ip->i_inode.i_atime.tv_sec >= quantum) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001279 gfs2_glock_dq(gh);
Steven Whitehousefd88de562006-05-05 16:59:11 -04001280 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1281 gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001282 error = gfs2_glock_nq(gh);
1283 if (error)
1284 return error;
1285
1286 /* Verify that atime hasn't been updated while we were
1287 trying to get exclusive lock. */
1288
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001289 tv = CURRENT_TIME;
1290 if (tv.tv_sec - ip->i_inode.i_atime.tv_sec >= quantum) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001291 struct buffer_head *dibh;
Steven Whitehouse48516ce2006-10-02 12:39:19 -04001292 struct gfs2_dinode *di;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001293
1294 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1295 if (error == -EROFS)
1296 return 0;
1297 if (error)
1298 goto fail;
1299
1300 error = gfs2_meta_inode_buffer(ip, &dibh);
1301 if (error)
1302 goto fail_end_trans;
1303
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001304 ip->i_inode.i_atime = tv;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001305
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001306 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse48516ce2006-10-02 12:39:19 -04001307 di = (struct gfs2_dinode *)dibh->b_data;
Steven Whitehouse1a7b1ee2006-11-01 14:35:17 -05001308 di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001309 di->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001310 brelse(dibh);
1311
1312 gfs2_trans_end(sdp);
1313 }
1314
1315 /* If someone else has asked for the glock,
1316 unlock and let them have it. Then reacquire
1317 in the original state. */
1318 if (gfs2_glock_is_blocking(gl)) {
1319 gfs2_glock_dq(gh);
1320 gfs2_holder_reinit(state, flags, gh);
1321 return gfs2_glock_nq(gh);
1322 }
1323 }
1324
1325 return 0;
1326
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001327fail_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001328 gfs2_trans_end(sdp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001329fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001330 gfs2_glock_dq(gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001331 return error;
1332}
1333
David Teiglandb3b94fa2006-01-16 16:50:04 +00001334static int
1335__gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1336{
1337 struct buffer_head *dibh;
1338 int error;
1339
1340 error = gfs2_meta_inode_buffer(ip, &dibh);
1341 if (!error) {
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001342 error = inode_setattr(&ip->i_inode, attr);
1343 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001344 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001345 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001346 brelse(dibh);
1347 }
1348 return error;
1349}
1350
1351/**
1352 * gfs2_setattr_simple -
1353 * @ip:
1354 * @attr:
1355 *
1356 * Called with a reference on the vnode.
1357 *
1358 * Returns: errno
1359 */
1360
1361int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1362{
1363 int error;
1364
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001365 if (current->journal_info)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001366 return __gfs2_setattr_simple(ip, attr);
1367
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001368 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001369 if (error)
1370 return error;
1371
1372 error = __gfs2_setattr_simple(ip, attr);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001373 gfs2_trans_end(GFS2_SB(&ip->i_inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001374 return error;
1375}
1376
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001377void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
1378{
1379 const struct gfs2_dinode_host *di = &ip->i_di;
1380 struct gfs2_dinode *str = buf;
1381
1382 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
1383 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
1384 str->di_header.__pad0 = 0;
1385 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
1386 str->di_header.__pad1 = 0;
1387 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
1388 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
1389 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
1390 str->di_uid = cpu_to_be32(ip->i_inode.i_uid);
1391 str->di_gid = cpu_to_be32(ip->i_inode.i_gid);
1392 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
1393 str->di_size = cpu_to_be64(di->di_size);
1394 str->di_blocks = cpu_to_be64(di->di_blocks);
1395 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
1396 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
1397 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
1398
1399 str->di_goal_meta = cpu_to_be64(di->di_goal_meta);
1400 str->di_goal_data = cpu_to_be64(di->di_goal_data);
1401 str->di_generation = cpu_to_be64(di->di_generation);
1402
1403 str->di_flags = cpu_to_be32(di->di_flags);
1404 str->di_height = cpu_to_be16(di->di_height);
1405 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
1406 !(ip->i_di.di_flags & GFS2_DIF_EXHASH) ?
1407 GFS2_FORMAT_DE : 0);
1408 str->di_depth = cpu_to_be16(di->di_depth);
1409 str->di_entries = cpu_to_be32(di->di_entries);
1410
1411 str->di_eattr = cpu_to_be64(di->di_eattr);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001412 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
1413 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
1414 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001415}
1416
1417void gfs2_dinode_print(const struct gfs2_inode *ip)
1418{
1419 const struct gfs2_dinode_host *di = &ip->i_di;
1420
1421 printk(KERN_INFO " no_formal_ino = %llu\n",
1422 (unsigned long long)ip->i_no_formal_ino);
1423 printk(KERN_INFO " no_addr = %llu\n",
1424 (unsigned long long)ip->i_no_addr);
1425 printk(KERN_INFO " di_size = %llu\n", (unsigned long long)di->di_size);
1426 printk(KERN_INFO " di_blocks = %llu\n",
1427 (unsigned long long)di->di_blocks);
1428 printk(KERN_INFO " di_goal_meta = %llu\n",
1429 (unsigned long long)di->di_goal_meta);
1430 printk(KERN_INFO " di_goal_data = %llu\n",
1431 (unsigned long long)di->di_goal_data);
1432 printk(KERN_INFO " di_flags = 0x%.8X\n", di->di_flags);
1433 printk(KERN_INFO " di_height = %u\n", di->di_height);
1434 printk(KERN_INFO " di_depth = %u\n", di->di_depth);
1435 printk(KERN_INFO " di_entries = %u\n", di->di_entries);
1436 printk(KERN_INFO " di_eattr = %llu\n",
1437 (unsigned long long)di->di_eattr);
1438}
1439