blob: 21dc784f66c2268d2e857314104847b600cc09de [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehousef2741d92011-05-13 12:11:17 +01003 * Copyright (C) 2004-2011 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
David Teiglandb3b94fa2006-01-16 16:50:04 +000010#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/namei.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000015#include <linux/mm.h>
16#include <linux/xattr.h>
17#include <linux/posix_acl.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050018#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050019#include <linux/crc32.h>
Steven Whitehousee9079cc2008-10-14 14:43:29 +010020#include <linux/fiemap.h>
Steven Whitehouse194c0112011-05-09 14:06:38 +010021#include <linux/security.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000022#include <asm/uaccess.h>
23
24#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050025#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000026#include "acl.h"
27#include "bmap.h"
28#include "dir.h"
Steven Whitehouse307cf6e2009-08-26 18:51:04 +010029#include "xattr.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000030#include "glock.h"
31#include "inode.h"
32#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000033#include "quota.h"
34#include "rgrp.h"
35#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050036#include "util.h"
Steven Whitehouseb2760582008-10-14 16:05:55 +010037#include "super.h"
Steven Whitehouse194c0112011-05-09 14:06:38 +010038#include "glops.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000039
Bob Petersonff342452015-03-27 08:25:41 -050040struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
Steven Whitehouse194c0112011-05-09 14:06:38 +010041{
Bob Petersonff342452015-03-27 08:25:41 -050042 return ilookup(sb, (unsigned long)no_addr);
Steven Whitehouse194c0112011-05-09 14:06:38 +010043}
44
45/**
46 * gfs2_set_iop - Sets inode operations
47 * @inode: The inode with correct i_mode filled in
48 *
49 * GFS2 lookup code fills in vfs inode contents based on info obtained
50 * from directory entry inside gfs2_inode_lookup().
51 */
52
53static void gfs2_set_iop(struct inode *inode)
54{
55 struct gfs2_sbd *sdp = GFS2_SB(inode);
56 umode_t mode = inode->i_mode;
57
58 if (S_ISREG(mode)) {
59 inode->i_op = &gfs2_file_iops;
60 if (gfs2_localflocks(sdp))
61 inode->i_fop = &gfs2_file_fops_nolock;
62 else
63 inode->i_fop = &gfs2_file_fops;
64 } else if (S_ISDIR(mode)) {
65 inode->i_op = &gfs2_dir_iops;
66 if (gfs2_localflocks(sdp))
67 inode->i_fop = &gfs2_dir_fops_nolock;
68 else
69 inode->i_fop = &gfs2_dir_fops;
70 } else if (S_ISLNK(mode)) {
71 inode->i_op = &gfs2_symlink_iops;
72 } else {
73 inode->i_op = &gfs2_file_iops;
74 init_special_inode(inode, inode->i_mode, inode->i_rdev);
75 }
76}
77
78/**
79 * gfs2_inode_lookup - Lookup an inode
80 * @sb: The super block
81 * @no_addr: The inode number
82 * @type: The type of the inode
Steven Whitehouse194c0112011-05-09 14:06:38 +010083 *
84 * Returns: A VFS inode, or an error
85 */
86
87struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
Bob Peterson73b462d2015-12-18 11:44:49 -060088 u64 no_addr, u64 no_formal_ino)
Steven Whitehouse194c0112011-05-09 14:06:38 +010089{
90 struct inode *inode;
91 struct gfs2_inode *ip;
92 struct gfs2_glock *io_gl = NULL;
93 int error;
94
Bob Petersonff342452015-03-27 08:25:41 -050095 inode = iget_locked(sb, (unsigned long)no_addr);
Steven Whitehouse194c0112011-05-09 14:06:38 +010096 if (!inode)
Steven Whitehouseac3beb62014-01-16 10:31:13 +000097 return ERR_PTR(-ENOMEM);
Steven Whitehouse194c0112011-05-09 14:06:38 +010098
Bob Petersone97321f2016-04-12 16:14:26 -040099 ip = GFS2_I(inode);
100 ip->i_no_addr = no_addr;
101
Steven Whitehouse194c0112011-05-09 14:06:38 +0100102 if (inode->i_state & I_NEW) {
103 struct gfs2_sbd *sdp = GFS2_SB(inode);
104 ip->i_no_formal_ino = no_formal_ino;
105
106 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
107 if (unlikely(error))
108 goto fail;
109 ip->i_gl->gl_object = ip;
110
111 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
112 if (unlikely(error))
113 goto fail_put;
114
115 set_bit(GIF_INVALID, &ip->i_flags);
116 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
117 if (unlikely(error))
118 goto fail_iopen;
119
120 ip->i_iopen_gh.gh_gl->gl_object = ip;
121 gfs2_glock_put(io_gl);
122 io_gl = NULL;
123
124 if (type == DT_UNKNOWN) {
125 /* Inode glock must be locked already */
126 error = gfs2_inode_refresh(GFS2_I(inode));
127 if (error)
128 goto fail_refresh;
129 } else {
130 inode->i_mode = DT2IF(type);
131 }
132
133 gfs2_set_iop(inode);
134 unlock_new_inode(inode);
135 }
136
137 return inode;
138
139fail_refresh:
Bob Petersona6a4d982013-05-29 11:51:52 -0400140 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100141 ip->i_iopen_gh.gh_gl->gl_object = NULL;
Bob Peterson86d067a2015-12-07 15:10:42 -0600142 gfs2_glock_dq_wait(&ip->i_iopen_gh);
143 gfs2_holder_uninit(&ip->i_iopen_gh);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100144fail_iopen:
145 if (io_gl)
146 gfs2_glock_put(io_gl);
147fail_put:
148 ip->i_gl->gl_object = NULL;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100149fail:
150 iget_failed(inode);
151 return ERR_PTR(error);
152}
153
154struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
155 u64 *no_formal_ino, unsigned int blktype)
156{
157 struct super_block *sb = sdp->sd_vfs;
158 struct gfs2_holder i_gh;
159 struct inode *inode = NULL;
160 int error;
161
162 /* Must not read in block until block type is verified */
163 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
164 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
165 if (error)
166 return ERR_PTR(error);
167
168 error = gfs2_check_blk_type(sdp, no_addr, blktype);
169 if (error)
170 goto fail;
171
Bob Peterson73b462d2015-12-18 11:44:49 -0600172 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100173 if (IS_ERR(inode))
174 goto fail;
175
176 /* Two extra checks for NFS only */
177 if (no_formal_ino) {
178 error = -ESTALE;
179 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
180 goto fail_iput;
181
182 error = -EIO;
183 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
184 goto fail_iput;
185
186 error = 0;
187 }
188
189fail:
190 gfs2_glock_dq_uninit(&i_gh);
191 return error ? ERR_PTR(error) : inode;
192fail_iput:
193 iput(inode);
194 goto fail;
195}
196
197
198struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
199{
200 struct qstr qstr;
201 struct inode *inode;
202 gfs2_str2qstr(&qstr, name);
203 inode = gfs2_lookupi(dip, &qstr, 1);
204 /* gfs2_lookupi has inconsistent callers: vfs
205 * related routines expect NULL for no entry found,
206 * gfs2_lookup_simple callers expect ENOENT
207 * and do not check for NULL.
208 */
209 if (inode == NULL)
210 return ERR_PTR(-ENOENT);
211 else
212 return inode;
213}
214
215
216/**
217 * gfs2_lookupi - Look up a filename in a directory and return its inode
218 * @d_gh: An initialized holder for the directory glock
219 * @name: The name of the inode to look for
220 * @is_root: If 1, ignore the caller's permissions
221 * @i_gh: An uninitialized holder for the new inode glock
222 *
223 * This can be called via the VFS filldir function when NFS is doing
224 * a readdirplus and the inode which its intending to stat isn't
225 * already in cache. In this case we must not take the directory glock
226 * again, since the readdir call will have already taken that lock.
227 *
228 * Returns: errno
229 */
230
231struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
232 int is_root)
233{
234 struct super_block *sb = dir->i_sb;
235 struct gfs2_inode *dip = GFS2_I(dir);
236 struct gfs2_holder d_gh;
237 int error = 0;
238 struct inode *inode = NULL;
239 int unlock = 0;
240
241 if (!name->len || name->len > GFS2_FNAMESIZE)
242 return ERR_PTR(-ENAMETOOLONG);
243
244 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
245 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
David Howells2b0143b2015-03-17 22:25:59 +0000246 dir == d_inode(sb->s_root))) {
Steven Whitehouse194c0112011-05-09 14:06:38 +0100247 igrab(dir);
248 return dir;
249 }
250
251 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
252 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
253 if (error)
254 return ERR_PTR(error);
255 unlock = 1;
256 }
257
258 if (!is_root) {
Al Viro10556cb2011-06-20 19:28:19 -0400259 error = gfs2_permission(dir, MAY_EXEC);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100260 if (error)
261 goto out;
262 }
263
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +0100264 inode = gfs2_dir_search(dir, name, false);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100265 if (IS_ERR(inode))
266 error = PTR_ERR(inode);
267out:
268 if (unlock)
269 gfs2_glock_dq_uninit(&d_gh);
270 if (error == -ENOENT)
271 return NULL;
272 return inode ? inode : ERR_PTR(error);
273}
274
275/**
276 * create_ok - OK to create a new on-disk inode here?
277 * @dip: Directory in which dinode is to be created
278 * @name: Name of new dinode
279 * @mode:
280 *
281 * Returns: errno
282 */
283
284static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
Al Viro175a4eb2011-07-26 03:30:54 -0400285 umode_t mode)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100286{
287 int error;
288
Al Viro10556cb2011-06-20 19:28:19 -0400289 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100290 if (error)
291 return error;
292
293 /* Don't create entries in an unlinked directory */
294 if (!dip->i_inode.i_nlink)
295 return -ENOENT;
296
Steven Whitehouse194c0112011-05-09 14:06:38 +0100297 if (dip->i_entries == (u32)-1)
298 return -EFBIG;
299 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
300 return -EMLINK;
301
302 return 0;
303}
304
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000305static void munge_mode_uid_gid(const struct gfs2_inode *dip,
306 struct inode *inode)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100307{
308 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -0800309 (dip->i_inode.i_mode & S_ISUID) &&
310 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000311 if (S_ISDIR(inode->i_mode))
312 inode->i_mode |= S_ISUID;
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -0800313 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000314 inode->i_mode &= ~07111;
315 inode->i_uid = dip->i_inode.i_uid;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100316 } else
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000317 inode->i_uid = current_fsuid();
Steven Whitehouse194c0112011-05-09 14:06:38 +0100318
319 if (dip->i_inode.i_mode & S_ISGID) {
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000320 if (S_ISDIR(inode->i_mode))
321 inode->i_mode |= S_ISGID;
322 inode->i_gid = dip->i_inode.i_gid;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100323 } else
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000324 inode->i_gid = current_fsgid();
Steven Whitehouse194c0112011-05-09 14:06:38 +0100325}
326
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000327static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100328{
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000329 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000330 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
Steven Whitehouse194c0112011-05-09 14:06:38 +0100331 int error;
332
Abhi Dasb8fbf472015-03-18 12:03:41 -0500333 error = gfs2_quota_lock_check(ip, &ap);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100334 if (error)
335 goto out;
336
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100337 error = gfs2_inplace_reserve(ip, &ap);
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000338 if (error)
339 goto out_quota;
340
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000341 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100342 if (error)
343 goto out_ipreserv;
344
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000345 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000346 ip->i_no_formal_ino = ip->i_generation;
347 ip->i_inode.i_ino = ip->i_no_addr;
348 ip->i_goal = ip->i_no_addr;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100349
350 gfs2_trans_end(sdp);
351
352out_ipreserv:
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000353 gfs2_inplace_release(ip);
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000354out_quota:
355 gfs2_quota_unlock(ip);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100356out:
Steven Whitehouse194c0112011-05-09 14:06:38 +0100357 return error;
358}
359
Steven Whitehousef2741d92011-05-13 12:11:17 +0100360static void gfs2_init_dir(struct buffer_head *dibh,
361 const struct gfs2_inode *parent)
Steven Whitehousee2d0a132011-05-13 09:55:55 +0100362{
363 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
364 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
365
366 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
367 dent->de_inum = di->di_num; /* already GFS2 endian */
368 dent->de_type = cpu_to_be16(DT_DIR);
369
370 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
371 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
372 gfs2_inum_out(parent, dent);
373 dent->de_type = cpu_to_be16(DT_DIR);
374
375}
376
Steven Whitehouse194c0112011-05-09 14:06:38 +0100377/**
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000378 * gfs2_init_xattr - Initialise an xattr block for a new inode
379 * @ip: The inode in question
380 *
381 * This sets up an empty xattr block for a new inode, ready to
382 * take any ACLs, LSM xattrs, etc.
383 */
384
385static void gfs2_init_xattr(struct gfs2_inode *ip)
386{
387 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
388 struct buffer_head *bh;
389 struct gfs2_ea_header *ea;
390
391 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
392 gfs2_trans_add_meta(ip->i_gl, bh);
393 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
394 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
395
396 ea = GFS2_EA_BH2FIRST(bh);
397 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
398 ea->ea_type = GFS2_EATYPE_UNUSED;
399 ea->ea_flags = GFS2_EAFLAG_LAST;
400
401 brelse(bh);
402}
403
404/**
Steven Whitehouse194c0112011-05-09 14:06:38 +0100405 * init_dinode - Fill in a new dinode structure
Steven Whitehousef2741d92011-05-13 12:11:17 +0100406 * @dip: The directory this inode is being created in
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000407 * @ip: The inode
Steven Whitehousef2741d92011-05-13 12:11:17 +0100408 * @symname: The symlink destination (if a symlink)
Steven Whitehousef2741d92011-05-13 12:11:17 +0100409 * @bhp: The buffer head (returned to caller)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100410 *
411 */
412
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000413static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000414 const char *symname)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100415{
Steven Whitehouse194c0112011-05-09 14:06:38 +0100416 struct gfs2_dinode *di;
417 struct buffer_head *dibh;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100418
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000419 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000420 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100421 di = (struct gfs2_dinode *)dibh->b_data;
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000422 gfs2_dinode_out(ip, di);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100423
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000424 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
425 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
Steven Whitehouse194c0112011-05-09 14:06:38 +0100426 di->__pad1 = 0;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100427 di->__pad2 = 0;
428 di->__pad3 = 0;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100429 memset(&di->__pad4, 0, sizeof(di->__pad4));
Steven Whitehouse194c0112011-05-09 14:06:38 +0100430 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000431 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
Steven Whitehouse160b4022011-05-13 10:34:59 +0100432
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000433 switch(ip->i_inode.i_mode & S_IFMT) {
Steven Whitehouse160b4022011-05-13 10:34:59 +0100434 case S_IFDIR:
Steven Whitehousee2d0a132011-05-13 09:55:55 +0100435 gfs2_init_dir(dibh, dip);
Steven Whitehouse160b4022011-05-13 10:34:59 +0100436 break;
437 case S_IFLNK:
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000438 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
Steven Whitehouse160b4022011-05-13 10:34:59 +0100439 break;
Steven Whitehousee2d0a132011-05-13 09:55:55 +0100440 }
441
Steven Whitehouse194c0112011-05-09 14:06:38 +0100442 set_buffer_uptodate(dibh);
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000443 brelse(dibh);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100444}
445
Steven Whitehouse534cf9c2014-01-06 12:03:05 +0000446/**
447 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
448 * @dip: The directory we are linking into
449 * @da: The dir add information
450 * @nr_inodes: The number of inodes involved
451 *
452 * This calculate the number of blocks we need to reserve in a
453 * transaction to link @nr_inodes into a directory. In most cases
454 * @nr_inodes will be 2 (the directory plus the inode being linked in)
455 * but in case of rename, 4 may be required.
456 *
457 * Returns: Number of blocks
458 */
459
460static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
461 const struct gfs2_diradd *da,
462 unsigned nr_inodes)
463{
464 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
465 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
466}
467
Steven Whitehouse194c0112011-05-09 14:06:38 +0100468static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000469 struct gfs2_inode *ip, struct gfs2_diradd *da)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100470{
471 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000472 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
Steven Whitehouse194c0112011-05-09 14:06:38 +0100473 int error;
474
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000475 if (da->nr_blocks) {
Abhi Dasb8fbf472015-03-18 12:03:41 -0500476 error = gfs2_quota_lock_check(dip, &ap);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100477 if (error)
478 goto fail_quota_locks;
479
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100480 error = gfs2_inplace_reserve(dip, &ap);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100481 if (error)
482 goto fail_quota_locks;
483
Steven Whitehouse534cf9c2014-01-06 12:03:05 +0000484 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100485 if (error)
486 goto fail_ipreserv;
487 } else {
488 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
489 if (error)
490 goto fail_quota_locks;
491 }
492
Steven Whitehouse2b47dad2014-01-06 12:49:43 +0000493 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100494
Steven Whitehouse194c0112011-05-09 14:06:38 +0100495 gfs2_trans_end(sdp);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100496fail_ipreserv:
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000497 gfs2_inplace_release(dip);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100498fail_quota_locks:
499 gfs2_quota_unlock(dip);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100500 return error;
501}
502
H Hartley Sweeten46cc1e52011-09-23 15:51:32 -0700503static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
Mimi Zohar9d8f13b2011-06-06 15:29:25 -0400504 void *fs_info)
505{
506 const struct xattr *xattr;
507 int err = 0;
508
509 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
510 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
511 xattr->value_len, 0,
512 GFS2_EATYPE_SECURITY);
513 if (err < 0)
514 break;
515 }
516 return err;
517}
518
Steven Whitehouse194c0112011-05-09 14:06:38 +0100519/**
Steven Whitehousef2741d92011-05-13 12:11:17 +0100520 * gfs2_create_inode - Create a new inode
521 * @dir: The parent directory
522 * @dentry: The new dentry
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100523 * @file: If non-NULL, the file which is being opened
Steven Whitehousef2741d92011-05-13 12:11:17 +0100524 * @mode: The permissions on the new inode
525 * @dev: For device nodes, this is the device number
526 * @symname: For symlinks, this is the link destination
527 * @size: The initial size of the inode (ignored for directories)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100528 *
Steven Whitehousef2741d92011-05-13 12:11:17 +0100529 * Returns: 0 on success, or error code
Steven Whitehouse194c0112011-05-09 14:06:38 +0100530 */
531
Steven Whitehousef2741d92011-05-13 12:11:17 +0100532static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100533 struct file *file,
Al Viro175a4eb2011-07-26 03:30:54 -0400534 umode_t mode, dev_t dev, const char *symname,
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100535 unsigned int size, int excl, int *opened)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100536{
Steven Whitehousef2741d92011-05-13 12:11:17 +0100537 const struct qstr *name = &dentry->d_name;
Christoph Hellwige01580b2013-12-20 05:16:52 -0800538 struct posix_acl *default_acl, *acl;
Steven Whitehousef2741d92011-05-13 12:11:17 +0100539 struct gfs2_holder ghs[2];
Steven Whitehouse194c0112011-05-09 14:06:38 +0100540 struct inode *inode = NULL;
Bob Peterson8e2e0042012-07-19 08:12:40 -0400541 struct gfs2_inode *dip = GFS2_I(dir), *ip;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100542 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Bob Petersona4923862015-12-07 16:24:27 -0600543 struct gfs2_glock *io_gl = NULL;
Bob Peterson783013c2015-12-04 10:19:14 -0600544 int error, free_vfs_inode = 1;
Steven Whitehouse9dbe9612012-10-31 10:37:10 +0000545 u32 aflags = 0;
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000546 unsigned blocks = 1;
Bob Peterson19aeb5a2014-09-29 08:52:04 -0400547 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
Steven Whitehouse194c0112011-05-09 14:06:38 +0100548
549 if (!name->len || name->len > GFS2_FNAMESIZE)
Steven Whitehousef2741d92011-05-13 12:11:17 +0100550 return -ENAMETOOLONG;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100551
Bob Petersonb54e9a02015-10-26 10:40:28 -0500552 error = gfs2_rsqa_alloc(dip);
Bob Peterson0a305e42012-06-06 11:17:59 +0100553 if (error)
554 return error;
555
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000556 error = gfs2_rindex_update(sdp);
557 if (error)
558 return error;
559
Steven Whitehousef2741d92011-05-13 12:11:17 +0100560 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100561 if (error)
562 goto fail;
563
564 error = create_ok(dip, name, mode);
565 if (error)
566 goto fail_gunlock;
567
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +0100568 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
569 error = PTR_ERR(inode);
570 if (!IS_ERR(inode)) {
Al Viro571a4b52014-11-19 19:34:49 +0000571 if (S_ISDIR(inode->i_mode)) {
572 iput(inode);
573 inode = ERR_PTR(-EISDIR);
574 goto fail_gunlock;
575 }
Al Viro44bb31b2014-11-19 19:35:24 +0000576 d_instantiate(dentry, inode);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100577 error = 0;
Miklos Szeredi0d0d1102013-09-16 14:52:00 +0200578 if (file) {
Al Viro44bb31b2014-11-19 19:35:24 +0000579 if (S_ISREG(inode->i_mode))
Miklos Szeredi5ca1db42013-09-23 13:21:04 +0100580 error = finish_open(file, dentry, gfs2_open_common, opened);
Al Viro44bb31b2014-11-19 19:35:24 +0000581 else
582 error = finish_no_open(file, NULL);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100583 }
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +0100584 gfs2_glock_dq_uninit(ghs);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100585 return error;
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +0100586 } else if (error != -ENOENT) {
587 goto fail_gunlock;
588 }
589
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000590 error = gfs2_diradd_alloc_required(dir, name, &da);
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000591 if (error < 0)
592 goto fail_gunlock;
593
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000594 inode = new_inode(sdp->sd_vfs);
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000595 error = -ENOMEM;
596 if (!inode)
597 goto fail_gunlock;
598
Christoph Hellwige01580b2013-12-20 05:16:52 -0800599 error = posix_acl_create(dir, &mode, &default_acl, &acl);
600 if (error)
Bob Peterson783013c2015-12-04 10:19:14 -0600601 goto fail_gunlock;
Christoph Hellwige01580b2013-12-20 05:16:52 -0800602
Bob Peterson8e2e0042012-07-19 08:12:40 -0400603 ip = GFS2_I(inode);
Bob Petersonb54e9a02015-10-26 10:40:28 -0500604 error = gfs2_rsqa_alloc(ip);
Steven Whitehouseff7f4cb2012-09-10 10:03:50 +0100605 if (error)
Christoph Hellwige01580b2013-12-20 05:16:52 -0800606 goto fail_free_acls;
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000607
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000608 inode->i_mode = mode;
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000609 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000610 inode->i_rdev = dev;
611 inode->i_size = size;
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000612 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Steven Whitehouse28fb3022013-02-26 19:09:35 +0000613 gfs2_set_inode_blocks(inode, 1);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000614 munge_mode_uid_gid(dip, inode);
Abhi Das00a158b2014-09-18 21:40:28 -0500615 check_and_update_goal(dip);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000616 ip->i_goal = dip->i_goal;
Steven Whitehouse28fb3022013-02-26 19:09:35 +0000617 ip->i_diskflags = 0;
618 ip->i_eattr = 0;
619 ip->i_height = 0;
620 ip->i_depth = 0;
621 ip->i_entries = 0;
622
623 switch(mode & S_IFMT) {
624 case S_IFREG:
625 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
626 gfs2_tune_get(sdp, gt_new_files_jdata))
627 ip->i_diskflags |= GFS2_DIF_JDATA;
628 gfs2_set_aops(inode);
629 break;
630 case S_IFDIR:
631 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
632 ip->i_diskflags |= GFS2_DIF_JDATA;
633 ip->i_entries = 2;
634 break;
635 }
Abhi Dasacc546f2015-11-10 15:07:26 -0600636
637 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
638 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
639 ip->i_diskflags |= GFS2_DIF_SYSTEM;
640
Steven Whitehouse28fb3022013-02-26 19:09:35 +0000641 gfs2_set_inode_flags(inode);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000642
David Howells2b0143b2015-03-17 22:25:59 +0000643 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
Steven Whitehouse9dbe9612012-10-31 10:37:10 +0000644 (dip->i_diskflags & GFS2_DIF_TOPDIR))
645 aflags |= GFS2_AF_ORLOV;
646
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000647 if (default_acl || acl)
648 blocks++;
649
650 error = alloc_dinode(ip, aflags, &blocks);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000651 if (error)
652 goto fail_free_inode;
653
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000654 gfs2_set_inode_blocks(inode, blocks);
655
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000656 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
657 if (error)
658 goto fail_free_inode;
659
Bob Peterson1e2d9d42012-11-21 09:56:00 -0500660 ip->i_gl->gl_object = ip;
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000661 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
662 if (error)
663 goto fail_free_inode;
664
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000665 error = gfs2_trans_begin(sdp, blocks, 0);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000666 if (error)
Steven Whitehouseff7f4cb2012-09-10 10:03:50 +0100667 goto fail_gunlock2;
Bob Peterson0a305e42012-06-06 11:17:59 +0100668
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000669 if (blocks > 1) {
670 ip->i_eattr = ip->i_no_addr + 1;
671 gfs2_init_xattr(ip);
672 }
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000673 init_dinode(dip, ip, symname);
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000674 gfs2_trans_end(sdp);
675
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000676 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
677 if (error)
678 goto fail_gunlock2;
679
Bob Petersona4923862015-12-07 16:24:27 -0600680 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
681
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000682 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
683 if (error)
684 goto fail_gunlock2;
685
686 ip->i_iopen_gh.gh_gl->gl_object = ip;
687 gfs2_glock_put(io_gl);
688 gfs2_set_iop(inode);
689 insert_inode_hash(inode);
690
Bob Peterson783013c2015-12-04 10:19:14 -0600691 free_vfs_inode = 0; /* After this point, the inode is no longer
692 considered free. Any failures need to undo
693 the gfs2 structures. */
Christoph Hellwige01580b2013-12-20 05:16:52 -0800694 if (default_acl) {
Al Viro1a39ba92016-05-13 03:59:17 +0200695 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
Christoph Hellwige01580b2013-12-20 05:16:52 -0800696 posix_acl_release(default_acl);
697 }
698 if (acl) {
699 if (!error)
Al Viro1a39ba92016-05-13 03:59:17 +0200700 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
Christoph Hellwige01580b2013-12-20 05:16:52 -0800701 posix_acl_release(acl);
702 }
703
Steven Whitehouse194c0112011-05-09 14:06:38 +0100704 if (error)
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000705 goto fail_gunlock3;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100706
Bob Petersonf45dc262014-03-19 09:37:00 -0400707 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
708 &gfs2_initxattrs, NULL);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100709 if (error)
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000710 goto fail_gunlock3;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100711
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000712 error = link_dinode(dip, name, ip, &da);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100713 if (error)
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000714 goto fail_gunlock3;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100715
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000716 mark_inode_dirty(inode);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100717 d_instantiate(dentry, inode);
Miklos Szeredic5bf8fe2013-09-16 14:52:03 +0200718 if (file) {
719 *opened |= FILE_CREATED;
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100720 error = finish_open(file, dentry, gfs2_open_common, opened);
Miklos Szeredic5bf8fe2013-09-16 14:52:03 +0200721 }
Steven Whitehouse28fb3022013-02-26 19:09:35 +0000722 gfs2_glock_dq_uninit(ghs);
723 gfs2_glock_dq_uninit(ghs + 1);
Bob Petersona4923862015-12-07 16:24:27 -0600724 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100725 return error;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100726
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000727fail_gunlock3:
Bob Peterson783013c2015-12-04 10:19:14 -0600728 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
729 gfs2_glock_put(io_gl);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100730fail_gunlock2:
Bob Petersona4923862015-12-07 16:24:27 -0600731 if (io_gl)
732 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100733 gfs2_glock_dq_uninit(ghs + 1);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000734fail_free_inode:
735 if (ip->i_gl)
736 gfs2_glock_put(ip->i_gl);
Bob Petersonb54e9a02015-10-26 10:40:28 -0500737 gfs2_rsqa_delete(ip, NULL);
Christoph Hellwige01580b2013-12-20 05:16:52 -0800738fail_free_acls:
739 if (default_acl)
740 posix_acl_release(default_acl);
741 if (acl)
742 posix_acl_release(acl);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100743fail_gunlock:
Steven Whitehouse2b47dad2014-01-06 12:49:43 +0000744 gfs2_dir_no_add(&da);
Steven Whitehousef2741d92011-05-13 12:11:17 +0100745 gfs2_glock_dq_uninit(ghs);
Steven Whitehouse40ac2182011-08-02 13:17:27 +0100746 if (inode && !IS_ERR(inode)) {
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000747 clear_nlink(inode);
Abhi Das05978802014-03-31 10:33:17 -0500748 if (!free_vfs_inode)
749 mark_inode_dirty(inode);
750 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
751 &GFS2_I(inode)->i_flags);
Steven Whitehouse40ac2182011-08-02 13:17:27 +0100752 iput(inode);
753 }
Steven Whitehouse194c0112011-05-09 14:06:38 +0100754fail:
Steven Whitehousef2741d92011-05-13 12:11:17 +0100755 return error;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100756}
Steven Whitehousef2741d92011-05-13 12:11:17 +0100757
David Teiglandb3b94fa2006-01-16 16:50:04 +0000758/**
759 * gfs2_create - Create a file
760 * @dir: The directory in which to create the file
761 * @dentry: The dentry of the new file
762 * @mode: The mode of the new file
763 *
764 * Returns: errno
765 */
766
767static int gfs2_create(struct inode *dir, struct dentry *dentry,
Al Viroebfc3b42012-06-10 18:05:36 -0400768 umode_t mode, bool excl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000769{
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100770 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000771}
772
773/**
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100774 * __gfs2_lookup - Look up a filename in a directory and return its inode
David Teiglandb3b94fa2006-01-16 16:50:04 +0000775 * @dir: The directory inode
776 * @dentry: The dentry of the new inode
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100777 * @file: File to be opened
778 * @opened: atomic_open flags
David Teiglandb3b94fa2006-01-16 16:50:04 +0000779 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000780 *
781 * Returns: errno
782 */
783
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100784static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
785 struct file *file, int *opened)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000786{
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100787 struct inode *inode;
788 struct dentry *d;
789 struct gfs2_holder gh;
790 struct gfs2_glock *gl;
791 int error;
792
793 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
Benjamin Coddington7b7a9112014-09-10 14:09:20 -0400794 if (inode == NULL) {
795 d_add(dentry, NULL);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100796 return NULL;
Benjamin Coddington7b7a9112014-09-10 14:09:20 -0400797 }
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100798 if (IS_ERR(inode))
799 return ERR_CAST(inode);
800
801 gl = GFS2_I(inode)->i_gl;
802 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
803 if (error) {
804 iput(inode);
805 return ERR_PTR(error);
Steven Whitehouse9656b2c2008-01-08 08:14:30 +0000806 }
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100807
808 d = d_splice_alias(inode, dentry);
J. Bruce Fieldsd57b9c92014-01-16 13:51:07 -0500809 if (IS_ERR(d)) {
J. Bruce Fieldsd57b9c92014-01-16 13:51:07 -0500810 gfs2_glock_dq_uninit(&gh);
811 return d;
812 }
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100813 if (file && S_ISREG(inode->i_mode))
814 error = finish_open(file, dentry, gfs2_open_common, opened);
815
816 gfs2_glock_dq_uninit(&gh);
Miklos Szeredi5ca1db42013-09-23 13:21:04 +0100817 if (error) {
818 dput(d);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100819 return ERR_PTR(error);
Miklos Szeredi5ca1db42013-09-23 13:21:04 +0100820 }
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100821 return d;
822}
823
824static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
825 unsigned flags)
826{
827 return __gfs2_lookup(dir, dentry, NULL, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000828}
829
830/**
831 * gfs2_link - Link to a file
832 * @old_dentry: The inode to link
833 * @dir: Add link to this directory
834 * @dentry: The name of the link
835 *
836 * Link the inode in "old_dentry" into the directory "dir" with the
837 * name in "dentry".
838 *
839 * Returns: errno
840 */
841
842static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
843 struct dentry *dentry)
844{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400845 struct gfs2_inode *dip = GFS2_I(dir);
846 struct gfs2_sbd *sdp = GFS2_SB(dir);
David Howells2b0143b2015-03-17 22:25:59 +0000847 struct inode *inode = d_inode(old_dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400848 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000849 struct gfs2_holder ghs[2];
Steven Whitehouse2baee032011-05-09 12:08:36 +0100850 struct buffer_head *dibh;
Bob Peterson19aeb5a2014-09-29 08:52:04 -0400851 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
David Teiglandb3b94fa2006-01-16 16:50:04 +0000852 int error;
853
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500854 if (S_ISDIR(inode->i_mode))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000855 return -EPERM;
856
Bob Petersonb54e9a02015-10-26 10:40:28 -0500857 error = gfs2_rsqa_alloc(dip);
Bob Peterson0a305e42012-06-06 11:17:59 +0100858 if (error)
859 return error;
860
David Teiglandb3b94fa2006-01-16 16:50:04 +0000861 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
862 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
863
Bob Peterson72dbf472008-08-12 13:39:29 -0500864 error = gfs2_glock_nq(ghs); /* parent */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000865 if (error)
Bob Peterson72dbf472008-08-12 13:39:29 -0500866 goto out_parent;
867
868 error = gfs2_glock_nq(ghs + 1); /* child */
869 if (error)
870 goto out_child;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000871
Steven Whitehoused192a8e2011-05-05 12:35:40 +0100872 error = -ENOENT;
873 if (inode->i_nlink == 0)
874 goto out_gunlock;
875
Al Viro10556cb2011-06-20 19:28:19 -0400876 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000877 if (error)
878 goto out_gunlock;
879
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100880 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000881 switch (error) {
882 case -ENOENT:
883 break;
884 case 0:
885 error = -EEXIST;
886 default:
887 goto out_gunlock;
888 }
889
890 error = -EINVAL;
Steven Whitehouse4f561102006-11-01 14:04:17 -0500891 if (!dip->i_inode.i_nlink)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000892 goto out_gunlock;
893 error = -EFBIG;
Steven Whitehousead6203f2008-11-03 13:59:19 +0000894 if (dip->i_entries == (u32)-1)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000895 goto out_gunlock;
896 error = -EPERM;
897 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
898 goto out_gunlock;
899 error = -EINVAL;
Steven Whitehouse4f561102006-11-01 14:04:17 -0500900 if (!ip->i_inode.i_nlink)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000901 goto out_gunlock;
902 error = -EMLINK;
Steven Whitehouse4f561102006-11-01 14:04:17 -0500903 if (ip->i_inode.i_nlink == (u32)-1)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000904 goto out_gunlock;
905
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000906 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
Steven Whitehousec7526662006-03-20 12:30:04 -0500907 if (error < 0)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000908 goto out_gunlock;
909
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000910 if (da.nr_blocks) {
911 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
Abhi Dasb8fbf472015-03-18 12:03:41 -0500912 error = gfs2_quota_lock_check(dip, &ap);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000913 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -0400914 goto out_gunlock;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000915
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100916 error = gfs2_inplace_reserve(dip, &ap);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000917 if (error)
918 goto out_gunlock_q;
919
Steven Whitehouse534cf9c2014-01-06 12:03:05 +0000920 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000921 if (error)
922 goto out_ipres;
923 } else {
924 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
925 if (error)
926 goto out_ipres;
927 }
928
Steven Whitehouse2baee032011-05-09 12:08:36 +0100929 error = gfs2_meta_inode_buffer(ip, &dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000930 if (error)
931 goto out_end_trans;
932
Steven Whitehouse2b47dad2014-01-06 12:49:43 +0000933 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
Steven Whitehouse2baee032011-05-09 12:08:36 +0100934 if (error)
935 goto out_brelse;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000936
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000937 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehouse2baee032011-05-09 12:08:36 +0100938 inc_nlink(&ip->i_inode);
939 ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouseab9bbda2011-08-15 14:20:36 +0100940 ihold(inode);
941 d_instantiate(dentry, inode);
942 mark_inode_dirty(inode);
Steven Whitehouse2baee032011-05-09 12:08:36 +0100943
944out_brelse:
945 brelse(dibh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400946out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000947 gfs2_trans_end(sdp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400948out_ipres:
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000949 if (da.nr_blocks)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000950 gfs2_inplace_release(dip);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400951out_gunlock_q:
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000952 if (da.nr_blocks)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000953 gfs2_quota_unlock(dip);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400954out_gunlock:
Steven Whitehouse2b47dad2014-01-06 12:49:43 +0000955 gfs2_dir_no_add(&da);
Bob Peterson72dbf472008-08-12 13:39:29 -0500956 gfs2_glock_dq(ghs + 1);
957out_child:
958 gfs2_glock_dq(ghs);
959out_parent:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000960 gfs2_holder_uninit(ghs);
961 gfs2_holder_uninit(ghs + 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000962 return error;
963}
964
Steven Whitehouse87ec2172009-05-22 10:54:50 +0100965/*
966 * gfs2_unlink_ok - check to see that a inode is still in a directory
967 * @dip: the directory
968 * @name: the name of the file
969 * @ip: the inode
970 *
971 * Assumes that the lock on (at least) @dip is held.
972 *
973 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
974 */
975
976static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
977 const struct gfs2_inode *ip)
978{
979 int error;
980
981 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
982 return -EPERM;
983
984 if ((dip->i_inode.i_mode & S_ISVTX) &&
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -0800985 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
986 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
Steven Whitehouse87ec2172009-05-22 10:54:50 +0100987 return -EPERM;
988
989 if (IS_APPEND(&dip->i_inode))
990 return -EPERM;
991
Al Viro10556cb2011-06-20 19:28:19 -0400992 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
Steven Whitehouse87ec2172009-05-22 10:54:50 +0100993 if (error)
994 return error;
995
Fabian Frederick37975f12014-10-09 22:49:21 +0200996 return gfs2_dir_check(&dip->i_inode, name, ip);
Steven Whitehouse87ec2172009-05-22 10:54:50 +0100997}
998
David Teiglandb3b94fa2006-01-16 16:50:04 +0000999/**
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001000 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1001 * @dip: The parent directory
1002 * @name: The name of the entry in the parent directory
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001003 * @inode: The inode to be removed
1004 *
1005 * Called with all the locks and in a transaction. This will only be
1006 * called for a directory after it has been checked to ensure it is empty.
1007 *
1008 * Returns: 0 on success, or an error
1009 */
1010
1011static int gfs2_unlink_inode(struct gfs2_inode *dip,
Bob Peterson4327a9b2012-11-12 13:03:29 -05001012 const struct dentry *dentry)
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001013{
David Howells2b0143b2015-03-17 22:25:59 +00001014 struct inode *inode = d_inode(dentry);
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001015 struct gfs2_inode *ip = GFS2_I(inode);
1016 int error;
1017
1018 error = gfs2_dir_del(dip, dentry);
1019 if (error)
1020 return error;
1021
1022 ip->i_entries = 0;
1023 inode->i_ctime = CURRENT_TIME;
1024 if (S_ISDIR(inode->i_mode))
1025 clear_nlink(inode);
1026 else
1027 drop_nlink(inode);
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001028 mark_inode_dirty(inode);
1029 if (inode->i_nlink == 0)
1030 gfs2_unlink_di(inode);
1031 return 0;
1032}
1033
1034
1035/**
1036 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1037 * @dir: The inode of the directory containing the inode to unlink
David Teiglandb3b94fa2006-01-16 16:50:04 +00001038 * @dentry: The file itself
1039 *
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001040 * This routine uses the type of the inode as a flag to figure out
1041 * whether this is an unlink or an rmdir.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001042 *
1043 * Returns: errno
1044 */
1045
1046static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1047{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001048 struct gfs2_inode *dip = GFS2_I(dir);
1049 struct gfs2_sbd *sdp = GFS2_SB(dir);
David Howells2b0143b2015-03-17 22:25:59 +00001050 struct inode *inode = d_inode(dentry);
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001051 struct gfs2_inode *ip = GFS2_I(inode);
Russell Cattelanddee7602007-01-29 17:13:44 -06001052 struct gfs2_holder ghs[3];
1053 struct gfs2_rgrpd *rgd;
Bob Peterson5e2f7d62012-04-04 22:11:16 -04001054 int error;
1055
1056 error = gfs2_rindex_update(sdp);
1057 if (error)
1058 return error;
1059
1060 error = -EROFS;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001061
Russell Cattelanddee7602007-01-29 17:13:44 -06001062 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1063 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1064
Steven Whitehouse66fc0612012-02-08 12:58:32 +00001065 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
Steven Whitehousea365fbf2012-02-24 15:09:14 +00001066 if (!rgd)
Steven Whitehouse87654892011-11-08 14:04:20 +00001067 goto out_inodes;
Steven Whitehousea365fbf2012-02-24 15:09:14 +00001068
Russell Cattelanddee7602007-01-29 17:13:44 -06001069 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1070
1071
Steven Whitehouse8497a462007-08-26 14:23:56 +01001072 error = gfs2_glock_nq(ghs); /* parent */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001073 if (error)
Steven Whitehouse8497a462007-08-26 14:23:56 +01001074 goto out_parent;
1075
1076 error = gfs2_glock_nq(ghs + 1); /* child */
1077 if (error)
1078 goto out_child;
1079
Steven Whitehoused192a8e2011-05-05 12:35:40 +01001080 error = -ENOENT;
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001081 if (inode->i_nlink == 0)
Steven Whitehoused192a8e2011-05-05 12:35:40 +01001082 goto out_rgrp;
1083
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001084 if (S_ISDIR(inode->i_mode)) {
1085 error = -ENOTEMPTY;
1086 if (ip->i_entries > 2 || inode->i_nlink > 2)
1087 goto out_rgrp;
1088 }
1089
Steven Whitehouse8497a462007-08-26 14:23:56 +01001090 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1091 if (error)
1092 goto out_rgrp;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001093
1094 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1095 if (error)
Bob Peterson72dbf472008-08-12 13:39:29 -05001096 goto out_gunlock;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001097
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001098 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001099 if (error)
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001100 goto out_end_trans;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001101
Bob Peterson4327a9b2012-11-12 13:03:29 -05001102 error = gfs2_unlink_inode(dip, dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001103
1104out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001105 gfs2_trans_end(sdp);
Bob Peterson72dbf472008-08-12 13:39:29 -05001106out_gunlock:
Steven Whitehouse8497a462007-08-26 14:23:56 +01001107 gfs2_glock_dq(ghs + 2);
1108out_rgrp:
Steven Whitehouse8497a462007-08-26 14:23:56 +01001109 gfs2_glock_dq(ghs + 1);
1110out_child:
Steven Whitehouse8497a462007-08-26 14:23:56 +01001111 gfs2_glock_dq(ghs);
1112out_parent:
Steven Whitehouse87654892011-11-08 14:04:20 +00001113 gfs2_holder_uninit(ghs + 2);
1114out_inodes:
1115 gfs2_holder_uninit(ghs + 1);
Steven Whitehouse8497a462007-08-26 14:23:56 +01001116 gfs2_holder_uninit(ghs);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001117 return error;
1118}
1119
1120/**
1121 * gfs2_symlink - Create a symlink
1122 * @dir: The directory to create the symlink in
1123 * @dentry: The dentry to put the symlink in
1124 * @symname: The thing which the link points to
1125 *
1126 * Returns: errno
1127 */
1128
1129static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1130 const char *symname)
1131{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001132 struct gfs2_sbd *sdp = GFS2_SB(dir);
Steven Whitehouse160b4022011-05-13 10:34:59 +01001133 unsigned int size;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001134
David Teiglandb3b94fa2006-01-16 16:50:04 +00001135 size = strlen(symname);
1136 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1137 return -ENAMETOOLONG;
1138
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001139 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001140}
1141
1142/**
1143 * gfs2_mkdir - Make a directory
1144 * @dir: The parent directory of the new one
1145 * @dentry: The dentry of the new directory
1146 * @mode: The mode of the new directory
1147 *
1148 * Returns: errno
1149 */
1150
Al Viro18bb1db2011-07-26 01:41:39 -04001151static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001152{
Steven Whitehouse28fb3022013-02-26 19:09:35 +00001153 struct gfs2_sbd *sdp = GFS2_SB(dir);
1154 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001155 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001156}
1157
1158/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001159 * gfs2_mknod - Make a special file
1160 * @dir: The directory in which the special file will reside
1161 * @dentry: The dentry of the special file
1162 * @mode: The mode of the special file
Steven Whitehousef2741d92011-05-13 12:11:17 +01001163 * @dev: The device specification of the special file
David Teiglandb3b94fa2006-01-16 16:50:04 +00001164 *
1165 */
1166
Al Viro1a67aaf2011-07-26 01:52:52 -04001167static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001168 dev_t dev)
1169{
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001170 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1171}
1172
1173/**
1174 * gfs2_atomic_open - Atomically open a file
1175 * @dir: The directory
1176 * @dentry: The proposed new entry
1177 * @file: The proposed new struct file
1178 * @flags: open flags
1179 * @mode: File mode
1180 * @opened: Flag to say whether the file has been opened or not
1181 *
1182 * Returns: error code or 0 for success
1183 */
1184
1185static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
Antonio Ospite86fbca42015-05-01 12:54:38 -05001186 struct file *file, unsigned flags,
1187 umode_t mode, int *opened)
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001188{
1189 struct dentry *d;
1190 bool excl = !!(flags & O_EXCL);
1191
Al Viro4d93bc32014-09-12 18:21:05 -04001192 if (!d_unhashed(dentry))
1193 goto skip_lookup;
1194
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001195 d = __gfs2_lookup(dir, dentry, file, opened);
1196 if (IS_ERR(d))
1197 return PTR_ERR(d);
Miklos Szeredi5ca1db42013-09-23 13:21:04 +01001198 if (d != NULL)
1199 dentry = d;
David Howells2b0143b2015-03-17 22:25:59 +00001200 if (d_really_is_positive(dentry)) {
Al Viroec7d8792014-11-19 19:35:58 +00001201 if (!(*opened & FILE_OPENED))
1202 return finish_no_open(file, d);
Miklos Szeredi5ca1db42013-09-23 13:21:04 +01001203 dput(d);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001204 return 0;
1205 }
1206
Miklos Szeredi5ca1db42013-09-23 13:21:04 +01001207 BUG_ON(d != NULL);
Al Viro4d93bc32014-09-12 18:21:05 -04001208
1209skip_lookup:
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001210 if (!(flags & O_CREAT))
1211 return -ENOENT;
1212
1213 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001214}
1215
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001216/*
1217 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1218 * @this: move this
1219 * @to: to here
1220 *
1221 * Follow @to back to the root and make sure we don't encounter @this
1222 * Assumes we already hold the rename lock.
1223 *
1224 * Returns: errno
1225 */
1226
1227static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1228{
1229 struct inode *dir = &to->i_inode;
1230 struct super_block *sb = dir->i_sb;
1231 struct inode *tmp;
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001232 int error = 0;
1233
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001234 igrab(dir);
1235
1236 for (;;) {
1237 if (dir == &this->i_inode) {
1238 error = -EINVAL;
1239 break;
1240 }
David Howells2b0143b2015-03-17 22:25:59 +00001241 if (dir == d_inode(sb->s_root)) {
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001242 error = 0;
1243 break;
1244 }
1245
Steven Whitehouse8d123582010-09-17 12:30:23 +01001246 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
Abhi Das48f8f712014-03-12 03:41:44 -05001247 if (!tmp) {
1248 error = -ENOENT;
1249 break;
1250 }
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001251 if (IS_ERR(tmp)) {
1252 error = PTR_ERR(tmp);
1253 break;
1254 }
1255
1256 iput(dir);
1257 dir = tmp;
1258 }
1259
1260 iput(dir);
1261
1262 return error;
1263}
1264
David Teiglandb3b94fa2006-01-16 16:50:04 +00001265/**
Benjamin Marzinskia63b7bb2015-05-05 12:12:19 -05001266 * update_moved_ino - Update an inode that's being moved
1267 * @ip: The inode being moved
1268 * @ndip: The parent directory of the new filename
1269 * @dir_rename: True of ip is a directory
1270 *
1271 * Returns: errno
1272 */
1273
1274static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1275 int dir_rename)
1276{
1277 int error;
1278 struct buffer_head *dibh;
1279
1280 if (dir_rename)
1281 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1282
1283 error = gfs2_meta_inode_buffer(ip, &dibh);
1284 if (error)
1285 return error;
1286 ip->i_inode.i_ctime = CURRENT_TIME;
1287 gfs2_trans_add_meta(ip->i_gl, dibh);
1288 gfs2_dinode_out(ip, dibh->b_data);
1289 brelse(dibh);
1290 return 0;
1291}
1292
1293
1294/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001295 * gfs2_rename - Rename a file
1296 * @odir: Parent directory of old file name
1297 * @odentry: The old dentry of the file
1298 * @ndir: Parent directory of new file name
1299 * @ndentry: The new dentry of the file
1300 *
1301 * Returns: errno
1302 */
1303
1304static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1305 struct inode *ndir, struct dentry *ndentry)
1306{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001307 struct gfs2_inode *odip = GFS2_I(odir);
1308 struct gfs2_inode *ndip = GFS2_I(ndir);
David Howells2b0143b2015-03-17 22:25:59 +00001309 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001310 struct gfs2_inode *nip = NULL;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001311 struct gfs2_sbd *sdp = GFS2_SB(odir);
Steven Whitehouse8339ee52011-08-31 16:38:29 +01001312 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
Russell Cattelanddee7602007-01-29 17:13:44 -06001313 struct gfs2_rgrpd *nrgd;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001314 unsigned int num_gh;
1315 int dir_rename = 0;
Bob Peterson19aeb5a2014-09-29 08:52:04 -04001316 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
David Teiglandb3b94fa2006-01-16 16:50:04 +00001317 unsigned int x;
1318 int error;
1319
David Howells2b0143b2015-03-17 22:25:59 +00001320 if (d_really_is_positive(ndentry)) {
1321 nip = GFS2_I(d_inode(ndentry));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001322 if (ip == nip)
1323 return 0;
1324 }
1325
Bob Peterson5e2f7d62012-04-04 22:11:16 -04001326 error = gfs2_rindex_update(sdp);
1327 if (error)
1328 return error;
1329
Bob Petersonb54e9a02015-10-26 10:40:28 -05001330 error = gfs2_rsqa_alloc(ndip);
Bob Peterson0a305e42012-06-06 11:17:59 +01001331 if (error)
1332 return error;
1333
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001334 if (odip != ndip) {
1335 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1336 0, &r_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001337 if (error)
1338 goto out;
1339
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001340 if (S_ISDIR(ip->i_inode.i_mode)) {
1341 dir_rename = 1;
Benjamin Marzinskia63b7bb2015-05-05 12:12:19 -05001342 /* don't move a directory into its subdir */
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001343 error = gfs2_ok_to_move(ip, ndip);
1344 if (error)
1345 goto out_gunlock_r;
1346 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001347 }
1348
Steven Whitehoused9d1ca32006-06-21 15:38:17 -04001349 num_gh = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001350 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
Steven Whitehoused9d1ca32006-06-21 15:38:17 -04001351 if (odip != ndip) {
1352 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1353 num_gh++;
1354 }
1355 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1356 num_gh++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001357
Steven Whitehoused9d1ca32006-06-21 15:38:17 -04001358 if (nip) {
1359 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1360 num_gh++;
Russell Cattelanddee7602007-01-29 17:13:44 -06001361 /* grab the resource lock for unlink flag twiddling
1362 * this is the case of the target file already existing
1363 * so we unlink before doing the rename
1364 */
Steven Whitehouse66fc0612012-02-08 12:58:32 +00001365 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
Russell Cattelanddee7602007-01-29 17:13:44 -06001366 if (nrgd)
1367 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
Steven Whitehoused9d1ca32006-06-21 15:38:17 -04001368 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001369
Bob Peterson72dbf472008-08-12 13:39:29 -05001370 for (x = 0; x < num_gh; x++) {
1371 error = gfs2_glock_nq(ghs + x);
1372 if (error)
1373 goto out_gunlock;
1374 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001375
Steven Whitehoused192a8e2011-05-05 12:35:40 +01001376 error = -ENOENT;
1377 if (ip->i_inode.i_nlink == 0)
1378 goto out_gunlock;
1379
David Teiglandb3b94fa2006-01-16 16:50:04 +00001380 /* Check out the old directory */
1381
1382 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1383 if (error)
1384 goto out_gunlock;
1385
1386 /* Check out the new directory */
1387
1388 if (nip) {
1389 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1390 if (error)
1391 goto out_gunlock;
1392
Steven Whitehoused192a8e2011-05-05 12:35:40 +01001393 if (nip->i_inode.i_nlink == 0) {
1394 error = -EAGAIN;
1395 goto out_gunlock;
1396 }
1397
Steven Whitehouseb60623c2006-11-01 12:22:46 -05001398 if (S_ISDIR(nip->i_inode.i_mode)) {
Steven Whitehousead6203f2008-11-03 13:59:19 +00001399 if (nip->i_entries < 2) {
Steven Whitehouse94fb7632011-05-09 13:36:10 +01001400 gfs2_consist_inode(nip);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001401 error = -EIO;
1402 goto out_gunlock;
1403 }
Steven Whitehousead6203f2008-11-03 13:59:19 +00001404 if (nip->i_entries > 2) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001405 error = -ENOTEMPTY;
1406 goto out_gunlock;
1407 }
1408 }
1409 } else {
Al Viro10556cb2011-06-20 19:28:19 -04001410 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001411 if (error)
1412 goto out_gunlock;
1413
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001414 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001415 switch (error) {
1416 case -ENOENT:
1417 error = 0;
1418 break;
1419 case 0:
1420 error = -EEXIST;
1421 default:
1422 goto out_gunlock;
1423 };
1424
1425 if (odip != ndip) {
Steven Whitehouse4f561102006-11-01 14:04:17 -05001426 if (!ndip->i_inode.i_nlink) {
Steven Whitehoused192a8e2011-05-05 12:35:40 +01001427 error = -ENOENT;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001428 goto out_gunlock;
1429 }
Steven Whitehousead6203f2008-11-03 13:59:19 +00001430 if (ndip->i_entries == (u32)-1) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001431 error = -EFBIG;
1432 goto out_gunlock;
1433 }
Steven Whitehouseb60623c2006-11-01 12:22:46 -05001434 if (S_ISDIR(ip->i_inode.i_mode) &&
Steven Whitehouse4f561102006-11-01 14:04:17 -05001435 ndip->i_inode.i_nlink == (u32)-1) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001436 error = -EMLINK;
1437 goto out_gunlock;
1438 }
1439 }
1440 }
1441
1442 /* Check out the dir to be renamed */
1443
1444 if (dir_rename) {
David Howells2b0143b2015-03-17 22:25:59 +00001445 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001446 if (error)
1447 goto out_gunlock;
1448 }
1449
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00001450 if (nip == NULL) {
1451 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1452 if (error)
1453 goto out_gunlock;
1454 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001455
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00001456 if (da.nr_blocks) {
1457 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
Abhi Dasb8fbf472015-03-18 12:03:41 -05001458 error = gfs2_quota_lock_check(ndip, &ap);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001459 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04001460 goto out_gunlock;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001461
Steven Whitehouse7b9cff42013-10-02 11:13:25 +01001462 error = gfs2_inplace_reserve(ndip, &ap);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001463 if (error)
1464 goto out_gunlock_q;
1465
Steven Whitehouse534cf9c2014-01-06 12:03:05 +00001466 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1467 4 * RES_LEAF + 4, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001468 if (error)
1469 goto out_ipreserv;
1470 } else {
1471 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
S. Wendy Cheng87d21e02007-01-18 16:07:03 -05001472 5 * RES_LEAF + 4, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001473 if (error)
1474 goto out_gunlock;
1475 }
1476
1477 /* Remove the target file, if it exists */
1478
Bob Peterson4327a9b2012-11-12 13:03:29 -05001479 if (nip)
1480 error = gfs2_unlink_inode(ndip, ndentry);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001481
Benjamin Marzinskia63b7bb2015-05-05 12:12:19 -05001482 error = update_moved_ino(ip, ndip, dir_rename);
1483 if (error)
1484 goto out_end_trans;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001485
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001486 error = gfs2_dir_del(odip, odentry);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001487 if (error)
1488 goto out_end_trans;
1489
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001490 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001491 if (error)
1492 goto out_end_trans;
1493
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001494out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001495 gfs2_trans_end(sdp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001496out_ipreserv:
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00001497 if (da.nr_blocks)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001498 gfs2_inplace_release(ndip);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001499out_gunlock_q:
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00001500 if (da.nr_blocks)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001501 gfs2_quota_unlock(ndip);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001502out_gunlock:
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001503 gfs2_dir_no_add(&da);
Bob Peterson72dbf472008-08-12 13:39:29 -05001504 while (x--) {
1505 gfs2_glock_dq(ghs + x);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001506 gfs2_holder_uninit(ghs + x);
Bob Peterson72dbf472008-08-12 13:39:29 -05001507 }
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001508out_gunlock_r:
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001509 if (r_gh.gh_gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001510 gfs2_glock_dq_uninit(&r_gh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001511out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001512 return error;
1513}
1514
1515/**
Benjamin Marzinskia63b7bb2015-05-05 12:12:19 -05001516 * gfs2_exchange - exchange two files
1517 * @odir: Parent directory of old file name
1518 * @odentry: The old dentry of the file
1519 * @ndir: Parent directory of new file name
1520 * @ndentry: The new dentry of the file
1521 * @flags: The rename flags
1522 *
1523 * Returns: errno
1524 */
1525
1526static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1527 struct inode *ndir, struct dentry *ndentry,
1528 unsigned int flags)
1529{
1530 struct gfs2_inode *odip = GFS2_I(odir);
1531 struct gfs2_inode *ndip = GFS2_I(ndir);
1532 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1533 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1534 struct gfs2_sbd *sdp = GFS2_SB(odir);
1535 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1536 unsigned int num_gh;
1537 unsigned int x;
1538 umode_t old_mode = oip->i_inode.i_mode;
1539 umode_t new_mode = nip->i_inode.i_mode;
1540 int error;
1541
1542 error = gfs2_rindex_update(sdp);
1543 if (error)
1544 return error;
1545
1546 if (odip != ndip) {
1547 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1548 0, &r_gh);
1549 if (error)
1550 goto out;
1551
1552 if (S_ISDIR(old_mode)) {
1553 /* don't move a directory into its subdir */
1554 error = gfs2_ok_to_move(oip, ndip);
1555 if (error)
1556 goto out_gunlock_r;
1557 }
1558
1559 if (S_ISDIR(new_mode)) {
1560 /* don't move a directory into its subdir */
1561 error = gfs2_ok_to_move(nip, odip);
1562 if (error)
1563 goto out_gunlock_r;
1564 }
1565 }
1566
1567 num_gh = 1;
1568 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1569 if (odip != ndip) {
1570 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1571 num_gh++;
1572 }
1573 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1574 num_gh++;
1575
1576 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1577 num_gh++;
1578
1579 for (x = 0; x < num_gh; x++) {
1580 error = gfs2_glock_nq(ghs + x);
1581 if (error)
1582 goto out_gunlock;
1583 }
1584
1585 error = -ENOENT;
1586 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1587 goto out_gunlock;
1588
1589 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1590 if (error)
1591 goto out_gunlock;
1592 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1593 if (error)
1594 goto out_gunlock;
1595
1596 if (S_ISDIR(old_mode)) {
1597 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1598 if (error)
1599 goto out_gunlock;
1600 }
1601 if (S_ISDIR(new_mode)) {
1602 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1603 if (error)
1604 goto out_gunlock;
1605 }
1606 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1607 if (error)
1608 goto out_gunlock;
1609
1610 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1611 if (error)
1612 goto out_end_trans;
1613
1614 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1615 if (error)
1616 goto out_end_trans;
1617
1618 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1619 IF2DT(old_mode));
1620 if (error)
1621 goto out_end_trans;
1622
1623 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1624 IF2DT(new_mode));
1625 if (error)
1626 goto out_end_trans;
1627
1628 if (odip != ndip) {
1629 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1630 inc_nlink(&odip->i_inode);
1631 drop_nlink(&ndip->i_inode);
1632 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1633 inc_nlink(&ndip->i_inode);
1634 drop_nlink(&odip->i_inode);
1635 }
1636 }
1637 mark_inode_dirty(&ndip->i_inode);
1638 if (odip != ndip)
1639 mark_inode_dirty(&odip->i_inode);
1640
1641out_end_trans:
1642 gfs2_trans_end(sdp);
1643out_gunlock:
1644 while (x--) {
1645 gfs2_glock_dq(ghs + x);
1646 gfs2_holder_uninit(ghs + x);
1647 }
1648out_gunlock_r:
1649 if (r_gh.gh_gl)
1650 gfs2_glock_dq_uninit(&r_gh);
1651out:
1652 return error;
1653}
1654
1655static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1656 struct inode *ndir, struct dentry *ndentry,
1657 unsigned int flags)
1658{
1659 flags &= ~RENAME_NOREPLACE;
1660
1661 if (flags & ~RENAME_EXCHANGE)
1662 return -EINVAL;
1663
1664 if (flags & RENAME_EXCHANGE)
1665 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1666
1667 return gfs2_rename(odir, odentry, ndir, ndentry);
1668}
1669
1670/**
Al Viro6b255392015-11-17 10:20:54 -05001671 * gfs2_get_link - Follow a symbolic link
David Teiglandb3b94fa2006-01-16 16:50:04 +00001672 * @dentry: The dentry of the link
Al Viro6b255392015-11-17 10:20:54 -05001673 * @inode: The inode of the link
Al Virofceef392015-12-29 15:58:39 -05001674 * @done: destructor for return value
David Teiglandb3b94fa2006-01-16 16:50:04 +00001675 *
Al Viroc177c2a2010-01-14 00:59:16 -05001676 * This can handle symlinks of any size.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001677 *
1678 * Returns: 0 on success or error code
1679 */
1680
Al Viro6b255392015-11-17 10:20:54 -05001681static const char *gfs2_get_link(struct dentry *dentry,
Al Virofceef392015-12-29 15:58:39 -05001682 struct inode *inode,
1683 struct delayed_call *done)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001684{
Al Viro6b255392015-11-17 10:20:54 -05001685 struct gfs2_inode *ip = GFS2_I(inode);
Al Viroc177c2a2010-01-14 00:59:16 -05001686 struct gfs2_holder i_gh;
1687 struct buffer_head *dibh;
Steven Whitehouse160b4022011-05-13 10:34:59 +01001688 unsigned int size;
Al Viroc177c2a2010-01-14 00:59:16 -05001689 char *buf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001690 int error;
1691
Al Viro6b255392015-11-17 10:20:54 -05001692 if (!dentry)
1693 return ERR_PTR(-ECHILD);
1694
Al Viroc177c2a2010-01-14 00:59:16 -05001695 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1696 error = gfs2_glock_nq(&i_gh);
1697 if (error) {
1698 gfs2_holder_uninit(&i_gh);
Al Viro680baac2015-05-02 13:32:22 -04001699 return ERR_PTR(error);
Al Viroc177c2a2010-01-14 00:59:16 -05001700 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001701
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001702 size = (unsigned int)i_size_read(&ip->i_inode);
1703 if (size == 0) {
Al Viroc177c2a2010-01-14 00:59:16 -05001704 gfs2_consist_inode(ip);
1705 buf = ERR_PTR(-EIO);
1706 goto out;
1707 }
1708
1709 error = gfs2_meta_inode_buffer(ip, &dibh);
1710 if (error) {
1711 buf = ERR_PTR(error);
1712 goto out;
1713 }
1714
Steven Whitehouse160b4022011-05-13 10:34:59 +01001715 buf = kzalloc(size + 1, GFP_NOFS);
Al Viroc177c2a2010-01-14 00:59:16 -05001716 if (!buf)
1717 buf = ERR_PTR(-ENOMEM);
1718 else
Steven Whitehouse160b4022011-05-13 10:34:59 +01001719 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
Al Viroc177c2a2010-01-14 00:59:16 -05001720 brelse(dibh);
1721out:
1722 gfs2_glock_dq_uninit(&i_gh);
Al Viro680baac2015-05-02 13:32:22 -04001723 if (!IS_ERR(buf))
Al Virofceef392015-12-29 15:58:39 -05001724 set_delayed_call(done, kfree_link, buf);
Al Viro680baac2015-05-02 13:32:22 -04001725 return buf;
Al Viroc177c2a2010-01-14 00:59:16 -05001726}
1727
David Teiglandb3b94fa2006-01-16 16:50:04 +00001728/**
1729 * gfs2_permission -
Steven Whitehouse75d5cfb2011-01-19 09:42:40 +00001730 * @inode: The inode
1731 * @mask: The mask to be tested
1732 * @flags: Indicates whether this is an RCU path walk or not
David Teiglandb3b94fa2006-01-16 16:50:04 +00001733 *
Steven Whitehouse300c7d72006-11-27 09:55:28 -05001734 * This may be called from the VFS directly, or from within GFS2 with the
1735 * inode locked, so we look to see if the glock is already locked and only
1736 * lock the glock if its not already been done.
1737 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001738 * Returns: errno
1739 */
1740
Al Viro10556cb2011-06-20 19:28:19 -04001741int gfs2_permission(struct inode *inode, int mask)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001742{
Nick Pigginb74c79e2011-01-07 17:49:58 +11001743 struct gfs2_inode *ip;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001744 struct gfs2_holder i_gh;
1745 int error;
Steven Whitehouse300c7d72006-11-27 09:55:28 -05001746 int unlock = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001747
Nick Pigginb74c79e2011-01-07 17:49:58 +11001748
1749 ip = GFS2_I(inode);
Steven Whitehouse7afd88d2008-02-22 16:07:18 +00001750 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
Benjamin Marzinski2e60d762014-11-13 20:42:04 -06001751 if (mask & MAY_NOT_BLOCK)
1752 return -ECHILD;
1753 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1754 if (error)
1755 return error;
1756 unlock = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001757 }
1758
Miklos Szeredif58ba882008-07-02 21:12:01 +02001759 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1760 error = -EACCES;
1761 else
Al Viro2830ba72011-06-20 19:16:29 -04001762 error = generic_permission(inode, mask);
Steven Whitehouse300c7d72006-11-27 09:55:28 -05001763 if (unlock)
1764 gfs2_glock_dq_uninit(&i_gh);
1765
David Teiglandb3b94fa2006-01-16 16:50:04 +00001766 return error;
1767}
1768
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001769static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
Steven Whitehouse194c0112011-05-09 14:06:38 +01001770{
Steven Whitehouse194c0112011-05-09 14:06:38 +01001771 setattr_copy(inode, attr);
1772 mark_inode_dirty(inode);
Steven Whitehouse194c0112011-05-09 14:06:38 +01001773 return 0;
1774}
1775
1776/**
1777 * gfs2_setattr_simple -
1778 * @ip:
1779 * @attr:
1780 *
1781 * Returns: errno
1782 */
1783
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001784int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
Steven Whitehouse194c0112011-05-09 14:06:38 +01001785{
1786 int error;
1787
1788 if (current->journal_info)
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001789 return __gfs2_setattr_simple(inode, attr);
Steven Whitehouse194c0112011-05-09 14:06:38 +01001790
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001791 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
Steven Whitehouse194c0112011-05-09 14:06:38 +01001792 if (error)
1793 return error;
1794
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001795 error = __gfs2_setattr_simple(inode, attr);
1796 gfs2_trans_end(GFS2_SB(inode));
Steven Whitehouse194c0112011-05-09 14:06:38 +01001797 return error;
1798}
1799
David Teiglandb3b94fa2006-01-16 16:50:04 +00001800static int setattr_chown(struct inode *inode, struct iattr *attr)
1801{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001802 struct gfs2_inode *ip = GFS2_I(inode);
1803 struct gfs2_sbd *sdp = GFS2_SB(inode);
Eric W. Biederman7c06b5d2013-01-31 20:27:54 -08001804 kuid_t ouid, nuid;
1805 kgid_t ogid, ngid;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001806 int error;
Abhi Dasb8fbf472015-03-18 12:03:41 -05001807 struct gfs2_alloc_parms ap;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001808
Steven Whitehouse2933f922006-11-01 13:23:29 -05001809 ouid = inode->i_uid;
1810 ogid = inode->i_gid;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001811 nuid = attr->ia_uid;
1812 ngid = attr->ia_gid;
1813
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -08001814 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
Eric W. Biedermanf4108a62013-01-31 17:49:26 -08001815 ouid = nuid = NO_UID_QUOTA_CHANGE;
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -08001816 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
Eric W. Biedermanf4108a62013-01-31 17:49:26 -08001817 ogid = ngid = NO_GID_QUOTA_CHANGE;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001818
Bob Petersonb54e9a02015-10-26 10:40:28 -05001819 error = gfs2_rsqa_alloc(ip);
Bob Peterson62e96cf2014-01-06 17:16:01 -05001820 if (error)
1821 goto out;
1822
1823 error = gfs2_rindex_update(sdp);
1824 if (error)
1825 goto out;
1826
1827 error = gfs2_quota_lock(ip, nuid, ngid);
1828 if (error)
1829 goto out;
1830
Abhi Dasb8fbf472015-03-18 12:03:41 -05001831 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1832
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -08001833 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1834 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
Abhi Dasb8fbf472015-03-18 12:03:41 -05001835 error = gfs2_quota_check(ip, nuid, ngid, &ap);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001836 if (error)
1837 goto out_gunlock_q;
1838 }
1839
1840 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1841 if (error)
1842 goto out_gunlock_q;
1843
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001844 error = gfs2_setattr_simple(inode, attr);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001845 if (error)
1846 goto out_end_trans;
1847
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -08001848 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1849 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
Abhi Das39a72582015-06-02 11:02:24 -05001850 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
Abhi Dasb8fbf472015-03-18 12:03:41 -05001851 gfs2_quota_change(ip, ap.target, nuid, ngid);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001852 }
1853
Steven Whitehousea91ea692006-09-04 12:04:26 -04001854out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001855 gfs2_trans_end(sdp);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001856out_gunlock_q:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001857 gfs2_quota_unlock(ip);
Bob Peterson62e96cf2014-01-06 17:16:01 -05001858out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001859 return error;
1860}
1861
1862/**
1863 * gfs2_setattr - Change attributes on an inode
1864 * @dentry: The dentry which is changing
1865 * @attr: The structure describing the change
1866 *
1867 * The VFS layer wants to change one or more of an inodes attributes. Write
1868 * that change out to disk.
1869 *
1870 * Returns: errno
1871 */
1872
1873static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1874{
David Howells2b0143b2015-03-17 22:25:59 +00001875 struct inode *inode = d_inode(dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001876 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001877 struct gfs2_holder i_gh;
1878 int error;
1879
Bob Petersonb54e9a02015-10-26 10:40:28 -05001880 error = gfs2_rsqa_alloc(ip);
Bob Peterson0a305e42012-06-06 11:17:59 +01001881 if (error)
1882 return error;
1883
David Teiglandb3b94fa2006-01-16 16:50:04 +00001884 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1885 if (error)
1886 return error;
1887
1888 error = -EPERM;
1889 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1890 goto out;
1891
1892 error = inode_change_ok(inode, attr);
1893 if (error)
1894 goto out;
1895
1896 if (attr->ia_valid & ATTR_SIZE)
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001897 error = gfs2_setattr_size(inode, attr->ia_size);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001898 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1899 error = setattr_chown(inode, attr);
Christoph Hellwige01580b2013-12-20 05:16:52 -08001900 else {
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001901 error = gfs2_setattr_simple(inode, attr);
Christoph Hellwige01580b2013-12-20 05:16:52 -08001902 if (!error && attr->ia_valid & ATTR_MODE)
1903 error = posix_acl_chmod(inode, inode->i_mode);
1904 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001905
Steven Whitehousea91ea692006-09-04 12:04:26 -04001906out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001907 if (!error)
1908 mark_inode_dirty(inode);
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001909 gfs2_glock_dq_uninit(&i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001910 return error;
1911}
1912
1913/**
1914 * gfs2_getattr - Read out an inode's attributes
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001915 * @mnt: The vfsmount the inode is being accessed from
David Teiglandb3b94fa2006-01-16 16:50:04 +00001916 * @dentry: The dentry to stat
1917 * @stat: The inode's stats
1918 *
Steven Whitehousedcf3dd82006-11-27 10:12:05 -05001919 * This may be called from the VFS directly, or from within GFS2 with the
1920 * inode locked, so we look to see if the glock is already locked and only
1921 * lock the glock if its not already been done. Note that its the NFS
1922 * readdirplus operation which causes this to be called (from filldir)
1923 * with the glock already held.
1924 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001925 * Returns: errno
1926 */
1927
1928static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1929 struct kstat *stat)
1930{
David Howells2b0143b2015-03-17 22:25:59 +00001931 struct inode *inode = d_inode(dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001932 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001933 struct gfs2_holder gh;
1934 int error;
Steven Whitehousedcf3dd82006-11-27 10:12:05 -05001935 int unlock = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001936
Steven Whitehouse7afd88d2008-02-22 16:07:18 +00001937 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
Benjamin Marzinski2e60d762014-11-13 20:42:04 -06001938 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1939 if (error)
1940 return error;
1941 unlock = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001942 }
1943
Steven Whitehousedcf3dd82006-11-27 10:12:05 -05001944 generic_fillattr(inode, stat);
Steven Whitehoused7c103d2007-01-25 17:14:59 +00001945 if (unlock)
Steven Whitehousedcf3dd82006-11-27 10:12:05 -05001946 gfs2_glock_dq_uninit(&gh);
1947
1948 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001949}
1950
Steven Whitehousee9079cc2008-10-14 14:43:29 +01001951static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1952 u64 start, u64 len)
1953{
1954 struct gfs2_inode *ip = GFS2_I(inode);
1955 struct gfs2_holder gh;
1956 int ret;
1957
1958 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1959 if (ret)
1960 return ret;
1961
Al Viro59551022016-01-22 15:40:57 -05001962 inode_lock(inode);
Steven Whitehousee9079cc2008-10-14 14:43:29 +01001963
1964 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1965 if (ret)
1966 goto out;
1967
1968 if (gfs2_is_stuffed(ip)) {
1969 u64 phys = ip->i_no_addr << inode->i_blkbits;
1970 u64 size = i_size_read(inode);
1971 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1972 FIEMAP_EXTENT_DATA_INLINE;
1973 phys += sizeof(struct gfs2_dinode);
1974 phys += start;
1975 if (start + len > size)
1976 len = size - start;
1977 if (start < size)
1978 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1979 len, flags);
1980 if (ret == 1)
1981 ret = 0;
1982 } else {
1983 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1984 gfs2_block_map);
1985 }
1986
1987 gfs2_glock_dq_uninit(&gh);
1988out:
Al Viro59551022016-01-22 15:40:57 -05001989 inode_unlock(inode);
Steven Whitehousee9079cc2008-10-14 14:43:29 +01001990 return ret;
1991}
1992
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08001993const struct inode_operations gfs2_file_iops = {
Al Viroe6305c42008-07-15 21:03:57 -04001994 .permission = gfs2_permission,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001995 .setattr = gfs2_setattr,
1996 .getattr = gfs2_getattr,
Al Viro1a39ba92016-05-13 03:59:17 +02001997 .setxattr = generic_setxattr,
1998 .getxattr = generic_getxattr,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001999 .listxattr = gfs2_listxattr,
Al Viro1a39ba92016-05-13 03:59:17 +02002000 .removexattr = generic_removexattr,
Steven Whitehousee9079cc2008-10-14 14:43:29 +01002001 .fiemap = gfs2_fiemap,
Christoph Hellwig4e34e712011-07-23 17:37:31 +02002002 .get_acl = gfs2_get_acl,
Christoph Hellwige01580b2013-12-20 05:16:52 -08002003 .set_acl = gfs2_set_acl,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002004};
2005
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002006const struct inode_operations gfs2_dir_iops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +00002007 .create = gfs2_create,
2008 .lookup = gfs2_lookup,
2009 .link = gfs2_link,
2010 .unlink = gfs2_unlink,
2011 .symlink = gfs2_symlink,
2012 .mkdir = gfs2_mkdir,
Steven Whitehouse855d23c2011-05-09 16:42:37 +01002013 .rmdir = gfs2_unlink,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002014 .mknod = gfs2_mknod,
Benjamin Marzinskia63b7bb2015-05-05 12:12:19 -05002015 .rename2 = gfs2_rename2,
Al Viroe6305c42008-07-15 21:03:57 -04002016 .permission = gfs2_permission,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002017 .setattr = gfs2_setattr,
2018 .getattr = gfs2_getattr,
Al Viro1a39ba92016-05-13 03:59:17 +02002019 .setxattr = generic_setxattr,
2020 .getxattr = generic_getxattr,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002021 .listxattr = gfs2_listxattr,
Al Viro1a39ba92016-05-13 03:59:17 +02002022 .removexattr = generic_removexattr,
Steven Whitehousee9079cc2008-10-14 14:43:29 +01002023 .fiemap = gfs2_fiemap,
Christoph Hellwig4e34e712011-07-23 17:37:31 +02002024 .get_acl = gfs2_get_acl,
Christoph Hellwige01580b2013-12-20 05:16:52 -08002025 .set_acl = gfs2_set_acl,
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01002026 .atomic_open = gfs2_atomic_open,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002027};
2028
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002029const struct inode_operations gfs2_symlink_iops = {
Al Viroc177c2a2010-01-14 00:59:16 -05002030 .readlink = generic_readlink,
Al Viro6b255392015-11-17 10:20:54 -05002031 .get_link = gfs2_get_link,
Al Viroe6305c42008-07-15 21:03:57 -04002032 .permission = gfs2_permission,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002033 .setattr = gfs2_setattr,
2034 .getattr = gfs2_getattr,
Al Viro1a39ba92016-05-13 03:59:17 +02002035 .setxattr = generic_setxattr,
2036 .getxattr = generic_getxattr,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002037 .listxattr = gfs2_listxattr,
Al Viro1a39ba92016-05-13 03:59:17 +02002038 .removexattr = generic_removexattr,
Steven Whitehousee9079cc2008-10-14 14:43:29 +01002039 .fiemap = gfs2_fiemap,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002040};
2041