David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Steven Whitehouse | 3a8a9a1 | 2006-05-18 15:09:15 -0400 | [diff] [blame] | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 4 | * |
| 5 | * This copyrighted material is made available to anyone wishing to use, |
| 6 | * modify, copy, or redistribute it subject to the terms and conditions |
| 7 | * of the GNU General Public License v.2. |
| 8 | */ |
| 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 Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 17 | #include <linux/gfs2_ondisk.h> |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 18 | #include <linux/crc32.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 19 | |
| 20 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 21 | #include "lm_interface.h" |
| 22 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 23 | #include "acl.h" |
| 24 | #include "bmap.h" |
| 25 | #include "dir.h" |
| 26 | #include "eattr.h" |
| 27 | #include "glock.h" |
| 28 | #include "glops.h" |
| 29 | #include "inode.h" |
| 30 | #include "log.h" |
| 31 | #include "meta_io.h" |
| 32 | #include "ops_address.h" |
| 33 | #include "ops_file.h" |
| 34 | #include "ops_inode.h" |
| 35 | #include "quota.h" |
| 36 | #include "rgrp.h" |
| 37 | #include "trans.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 38 | #include "util.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 39 | |
| 40 | /** |
| 41 | * inode_attr_in - Copy attributes from the dinode into the VFS inode |
| 42 | * @ip: The GFS2 inode (with embedded disk inode data) |
| 43 | * @inode: The Linux VFS inode |
| 44 | * |
| 45 | */ |
| 46 | |
| 47 | static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode) |
| 48 | { |
| 49 | inode->i_ino = ip->i_num.no_formal_ino; |
| 50 | |
| 51 | switch (ip->i_di.di_mode & S_IFMT) { |
| 52 | case S_IFBLK: |
| 53 | case S_IFCHR: |
| 54 | inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor); |
| 55 | break; |
| 56 | default: |
| 57 | inode->i_rdev = 0; |
| 58 | break; |
| 59 | }; |
| 60 | |
| 61 | inode->i_mode = ip->i_di.di_mode; |
| 62 | inode->i_nlink = ip->i_di.di_nlink; |
| 63 | inode->i_uid = ip->i_di.di_uid; |
| 64 | inode->i_gid = ip->i_di.di_gid; |
| 65 | i_size_write(inode, ip->i_di.di_size); |
| 66 | inode->i_atime.tv_sec = ip->i_di.di_atime; |
| 67 | inode->i_mtime.tv_sec = ip->i_di.di_mtime; |
| 68 | inode->i_ctime.tv_sec = ip->i_di.di_ctime; |
| 69 | inode->i_atime.tv_nsec = 0; |
| 70 | inode->i_mtime.tv_nsec = 0; |
| 71 | inode->i_ctime.tv_nsec = 0; |
| 72 | inode->i_blksize = PAGE_SIZE; |
| 73 | inode->i_blocks = ip->i_di.di_blocks << |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 74 | (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 75 | |
| 76 | if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE) |
| 77 | inode->i_flags |= S_IMMUTABLE; |
| 78 | else |
| 79 | inode->i_flags &= ~S_IMMUTABLE; |
| 80 | |
| 81 | if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) |
| 82 | inode->i_flags |= S_APPEND; |
| 83 | else |
| 84 | inode->i_flags &= ~S_APPEND; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode |
| 89 | * @ip: The GFS2 inode (with embedded disk inode data) |
| 90 | * |
| 91 | */ |
| 92 | |
| 93 | void gfs2_inode_attr_in(struct gfs2_inode *ip) |
| 94 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 95 | struct inode *inode = &ip->i_inode; |
| 96 | inode_attr_in(ip, inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | /** |
| 100 | * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode |
| 101 | * @ip: The GFS2 inode |
| 102 | * |
| 103 | * Only copy out the attributes that we want the VFS layer |
| 104 | * to be able to modify. |
| 105 | */ |
| 106 | |
| 107 | void gfs2_inode_attr_out(struct gfs2_inode *ip) |
| 108 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 109 | struct inode *inode = &ip->i_inode; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 110 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 111 | gfs2_assert_withdraw(GFS2_SB(inode), |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 112 | (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); |
| 113 | ip->i_di.di_mode = inode->i_mode; |
| 114 | ip->i_di.di_uid = inode->i_uid; |
| 115 | ip->i_di.di_gid = inode->i_gid; |
| 116 | ip->i_di.di_atime = inode->i_atime.tv_sec; |
| 117 | ip->i_di.di_mtime = inode->i_mtime.tv_sec; |
| 118 | ip->i_di.di_ctime = inode->i_ctime.tv_sec; |
| 119 | } |
| 120 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 121 | static int iget_test(struct inode *inode, void *opaque) |
| 122 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 123 | struct gfs2_inode *ip = GFS2_I(inode); |
| 124 | struct gfs2_inum *inum = opaque; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 125 | |
| 126 | if (ip && ip->i_num.no_addr == inum->no_addr) |
| 127 | return 1; |
| 128 | |
| 129 | return 0; |
| 130 | } |
| 131 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 132 | static int iget_set(struct inode *inode, void *opaque) |
| 133 | { |
| 134 | struct gfs2_inode *ip = GFS2_I(inode); |
| 135 | struct gfs2_inum *inum = opaque; |
| 136 | |
| 137 | ip->i_num = *inum; |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 142 | { |
| 143 | return ilookup5(sb, (unsigned long)inum->no_formal_ino, |
| 144 | iget_test, inum); |
| 145 | } |
| 146 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 147 | static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 148 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 149 | return iget5_locked(sb, (unsigned long)inum->no_formal_ino, |
| 150 | iget_test, iget_set, inum); |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * gfs2_inode_lookup - Lookup an inode |
| 155 | * @sb: The super block |
| 156 | * @inum: The inode number |
| 157 | * @type: The type of the inode |
| 158 | * |
| 159 | * Returns: A VFS inode, or an error |
| 160 | */ |
| 161 | |
| 162 | struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type) |
| 163 | { |
| 164 | struct inode *inode = gfs2_iget(sb, inum); |
| 165 | struct gfs2_inode *ip = GFS2_I(inode); |
| 166 | struct gfs2_glock *io_gl; |
| 167 | int error; |
| 168 | |
| 169 | if (inode->i_state & I_NEW) { |
| 170 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 171 | umode_t mode = DT2IF(type); |
| 172 | inode->u.generic_ip = ip; |
| 173 | inode->i_mode = mode; |
| 174 | |
| 175 | if (S_ISREG(mode)) { |
| 176 | inode->i_op = &gfs2_file_iops; |
| 177 | inode->i_fop = &gfs2_file_fops; |
| 178 | inode->i_mapping->a_ops = &gfs2_file_aops; |
| 179 | } else if (S_ISDIR(mode)) { |
| 180 | inode->i_op = &gfs2_dir_iops; |
| 181 | inode->i_fop = &gfs2_dir_fops; |
| 182 | } else if (S_ISLNK(mode)) { |
| 183 | inode->i_op = &gfs2_symlink_iops; |
| 184 | } else { |
| 185 | inode->i_op = &gfs2_dev_iops; |
| 186 | } |
| 187 | |
| 188 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
| 189 | if (unlikely(error)) |
| 190 | goto fail; |
| 191 | ip->i_gl->gl_object = ip; |
| 192 | |
| 193 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
| 194 | if (unlikely(error)) |
| 195 | goto fail_put; |
| 196 | |
| 197 | ip->i_vn = ip->i_gl->gl_vn - 1; |
| 198 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
| 199 | if (unlikely(error)) |
| 200 | goto fail_iopen; |
| 201 | |
| 202 | gfs2_glock_put(io_gl); |
| 203 | unlock_new_inode(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 204 | } |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 205 | |
| 206 | return inode; |
| 207 | fail_iopen: |
| 208 | gfs2_glock_put(io_gl); |
| 209 | fail_put: |
| 210 | ip->i_gl->gl_object = NULL; |
| 211 | gfs2_glock_put(ip->i_gl); |
| 212 | fail: |
| 213 | iput(inode); |
| 214 | return ERR_PTR(error); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | /** |
| 218 | * gfs2_inode_refresh - Refresh the incore copy of the dinode |
| 219 | * @ip: The GFS2 inode |
| 220 | * |
| 221 | * Returns: errno |
| 222 | */ |
| 223 | |
| 224 | int gfs2_inode_refresh(struct gfs2_inode *ip) |
| 225 | { |
| 226 | struct buffer_head *dibh; |
| 227 | int error; |
| 228 | |
| 229 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 230 | if (error) |
| 231 | return error; |
| 232 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 233 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 234 | brelse(dibh); |
| 235 | return -EIO; |
| 236 | } |
| 237 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 238 | gfs2_dinode_in(&ip->i_di, dibh->b_data); |
| 239 | set_bit(GIF_MIN_INIT, &ip->i_flags); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 240 | |
| 241 | brelse(dibh); |
| 242 | |
| 243 | if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { |
| 244 | if (gfs2_consist_inode(ip)) |
| 245 | gfs2_dinode_print(&ip->i_di); |
| 246 | return -EIO; |
| 247 | } |
| 248 | if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) |
| 249 | return -ESTALE; |
| 250 | |
| 251 | ip->i_vn = ip->i_gl->gl_vn; |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 256 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 257 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 258 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 259 | struct gfs2_alloc *al; |
| 260 | struct gfs2_rgrpd *rgd; |
| 261 | int error; |
| 262 | |
| 263 | if (ip->i_di.di_blocks != 1) { |
| 264 | if (gfs2_consist_inode(ip)) |
| 265 | gfs2_dinode_print(&ip->i_di); |
| 266 | return -EIO; |
| 267 | } |
| 268 | |
| 269 | al = gfs2_alloc_get(ip); |
| 270 | |
| 271 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| 272 | if (error) |
| 273 | goto out; |
| 274 | |
| 275 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); |
| 276 | if (error) |
| 277 | goto out_qs; |
| 278 | |
| 279 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); |
| 280 | if (!rgd) { |
| 281 | gfs2_consist_inode(ip); |
| 282 | error = -EIO; |
| 283 | goto out_rindex_relse; |
| 284 | } |
| 285 | |
| 286 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, |
| 287 | &al->al_rgd_gh); |
| 288 | if (error) |
| 289 | goto out_rindex_relse; |
| 290 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 291 | error = gfs2_trans_begin(sdp, RES_RG_BIT + |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 292 | RES_STATFS + RES_QUOTA, 1); |
| 293 | if (error) |
| 294 | goto out_rg_gunlock; |
| 295 | |
| 296 | gfs2_trans_add_gl(ip->i_gl); |
| 297 | |
| 298 | gfs2_free_di(rgd, ip); |
| 299 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 300 | gfs2_trans_end(sdp); |
| 301 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); |
| 302 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 303 | out_rg_gunlock: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 304 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 305 | out_rindex_relse: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 306 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 307 | out_qs: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 308 | gfs2_quota_unhold(ip); |
Steven Whitehouse | 3632752 | 2006-04-28 10:46:21 -0400 | [diff] [blame] | 309 | out: |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 310 | gfs2_alloc_put(ip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 311 | return error; |
| 312 | } |
| 313 | |
| 314 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 315 | * gfs2_change_nlink - Change nlink count on inode |
| 316 | * @ip: The GFS2 inode |
| 317 | * @diff: The change in the nlink count required |
| 318 | * |
| 319 | * Returns: errno |
| 320 | */ |
| 321 | |
| 322 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) |
| 323 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 324 | struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 325 | struct buffer_head *dibh; |
| 326 | uint32_t nlink; |
| 327 | int error; |
| 328 | |
| 329 | nlink = ip->i_di.di_nlink + diff; |
| 330 | |
| 331 | /* If we are reducing the nlink count, but the new value ends up being |
| 332 | bigger than the old one, we must have underflowed. */ |
| 333 | if (diff < 0 && nlink > ip->i_di.di_nlink) { |
| 334 | if (gfs2_consist_inode(ip)) |
| 335 | gfs2_dinode_print(&ip->i_di); |
| 336 | return -EIO; |
| 337 | } |
| 338 | |
| 339 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 340 | if (error) |
| 341 | return error; |
| 342 | |
| 343 | ip->i_di.di_nlink = nlink; |
| 344 | ip->i_di.di_ctime = get_seconds(); |
| 345 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 346 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 347 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 348 | brelse(dibh); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 349 | mark_inode_dirty(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 350 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 351 | if (ip->i_di.di_nlink == 0) { |
| 352 | struct gfs2_rgrpd *rgd; |
| 353 | struct gfs2_holder ri_gh, rg_gh; |
| 354 | |
| 355 | error = gfs2_rindex_hold(sdp, &ri_gh); |
| 356 | if (error) |
| 357 | goto out; |
| 358 | error = -EIO; |
| 359 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); |
| 360 | if (!rgd) |
| 361 | goto out_norgrp; |
| 362 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); |
| 363 | if (error) |
| 364 | goto out_norgrp; |
| 365 | |
| 366 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ |
| 367 | gfs2_glock_dq_uninit(&rg_gh); |
| 368 | out_norgrp: |
| 369 | gfs2_glock_dq_uninit(&ri_gh); |
| 370 | } |
| 371 | out: |
| 372 | return error; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 373 | } |
| 374 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 375 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
| 376 | { |
| 377 | struct qstr qstr; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 378 | gfs2_str2qstr(&qstr, name); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 379 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
| 380 | } |
| 381 | |
| 382 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 383 | /** |
| 384 | * gfs2_lookupi - Look up a filename in a directory and return its inode |
| 385 | * @d_gh: An initialized holder for the directory glock |
| 386 | * @name: The name of the inode to look for |
| 387 | * @is_root: If 1, ignore the caller's permissions |
| 388 | * @i_gh: An uninitialized holder for the new inode glock |
| 389 | * |
| 390 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless |
| 391 | * @is_root is true. |
| 392 | * |
| 393 | * Returns: errno |
| 394 | */ |
| 395 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 396 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
| 397 | int is_root, struct nameidata *nd) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 398 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 399 | { |
Steven Whitehouse | c9fd430 | 2006-03-01 15:31:02 -0500 | [diff] [blame] | 400 | struct super_block *sb = dir->i_sb; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 401 | struct gfs2_inode *dip = GFS2_I(dir); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 402 | struct gfs2_holder d_gh; |
| 403 | struct gfs2_inum inum; |
| 404 | unsigned int type; |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 405 | int error = 0; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 406 | struct inode *inode = NULL; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 407 | |
| 408 | if (!name->len || name->len > GFS2_FNAMESIZE) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 409 | return ERR_PTR(-ENAMETOOLONG); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 410 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 411 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
| 412 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && |
| 413 | dir == sb->s_root->d_inode)) { |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 414 | igrab(dir); |
| 415 | return dir; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 416 | } |
| 417 | |
| 418 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
| 419 | if (error) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 420 | return ERR_PTR(error); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 421 | |
| 422 | if (!is_root) { |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 423 | error = gfs2_repermission(dir, MAY_EXEC, NULL); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 424 | if (error) |
| 425 | goto out; |
| 426 | } |
| 427 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 428 | error = gfs2_dir_search(dir, name, &inum, &type); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 429 | if (error) |
| 430 | goto out; |
| 431 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 432 | inode = gfs2_inode_lookup(sb, &inum, type); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 433 | |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 434 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 435 | gfs2_glock_dq_uninit(&d_gh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 436 | if (error == -ENOENT) |
| 437 | return NULL; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 438 | return inode; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 439 | } |
| 440 | |
| 441 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino) |
| 442 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 443 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 444 | struct buffer_head *bh; |
| 445 | struct gfs2_inum_range ir; |
| 446 | int error; |
| 447 | |
| 448 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| 449 | if (error) |
| 450 | return error; |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 451 | mutex_lock(&sdp->sd_inum_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 452 | |
| 453 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 454 | if (error) { |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 455 | mutex_unlock(&sdp->sd_inum_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 456 | gfs2_trans_end(sdp); |
| 457 | return error; |
| 458 | } |
| 459 | |
| 460 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
| 461 | |
| 462 | if (ir.ir_length) { |
| 463 | *formal_ino = ir.ir_start++; |
| 464 | ir.ir_length--; |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 465 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 466 | gfs2_inum_range_out(&ir, |
| 467 | bh->b_data + sizeof(struct gfs2_dinode)); |
| 468 | brelse(bh); |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 469 | mutex_unlock(&sdp->sd_inum_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 470 | gfs2_trans_end(sdp); |
| 471 | return 0; |
| 472 | } |
| 473 | |
| 474 | brelse(bh); |
| 475 | |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 476 | mutex_unlock(&sdp->sd_inum_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 477 | gfs2_trans_end(sdp); |
| 478 | |
| 479 | return 1; |
| 480 | } |
| 481 | |
| 482 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino) |
| 483 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 484 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
| 485 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 486 | struct gfs2_holder gh; |
| 487 | struct buffer_head *bh; |
| 488 | struct gfs2_inum_range ir; |
| 489 | int error; |
| 490 | |
| 491 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
| 492 | if (error) |
| 493 | return error; |
| 494 | |
| 495 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); |
| 496 | if (error) |
| 497 | goto out; |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 498 | mutex_lock(&sdp->sd_inum_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 499 | |
| 500 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 501 | if (error) |
| 502 | goto out_end_trans; |
| 503 | |
| 504 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
| 505 | |
| 506 | if (!ir.ir_length) { |
| 507 | struct buffer_head *m_bh; |
| 508 | uint64_t x, y; |
| 509 | |
| 510 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); |
| 511 | if (error) |
| 512 | goto out_brelse; |
| 513 | |
| 514 | x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
| 515 | x = y = be64_to_cpu(x); |
| 516 | ir.ir_start = x; |
| 517 | ir.ir_length = GFS2_INUM_QUANTUM; |
| 518 | x += GFS2_INUM_QUANTUM; |
| 519 | if (x < y) |
| 520 | gfs2_consist_inode(m_ip); |
| 521 | x = cpu_to_be64(x); |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 522 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 523 | *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x; |
| 524 | |
| 525 | brelse(m_bh); |
| 526 | } |
| 527 | |
| 528 | *formal_ino = ir.ir_start++; |
| 529 | ir.ir_length--; |
| 530 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 531 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 532 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
| 533 | |
| 534 | out_brelse: |
| 535 | brelse(bh); |
| 536 | |
| 537 | out_end_trans: |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 538 | mutex_unlock(&sdp->sd_inum_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 539 | gfs2_trans_end(sdp); |
| 540 | |
| 541 | out: |
| 542 | gfs2_glock_dq_uninit(&gh); |
| 543 | |
| 544 | return error; |
| 545 | } |
| 546 | |
| 547 | static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum) |
| 548 | { |
| 549 | int error; |
| 550 | |
| 551 | error = pick_formal_ino_1(sdp, inum); |
| 552 | if (error <= 0) |
| 553 | return error; |
| 554 | |
| 555 | error = pick_formal_ino_2(sdp, inum); |
| 556 | |
| 557 | return error; |
| 558 | } |
| 559 | |
| 560 | /** |
| 561 | * create_ok - OK to create a new on-disk inode here? |
| 562 | * @dip: Directory in which dinode is to be created |
| 563 | * @name: Name of new dinode |
| 564 | * @mode: |
| 565 | * |
| 566 | * Returns: errno |
| 567 | */ |
| 568 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 569 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 570 | unsigned int mode) |
| 571 | { |
| 572 | int error; |
| 573 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 574 | error = gfs2_repermission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 575 | if (error) |
| 576 | return error; |
| 577 | |
| 578 | /* Don't create entries in an unlinked directory */ |
| 579 | if (!dip->i_di.di_nlink) |
| 580 | return -EPERM; |
| 581 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 582 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 583 | switch (error) { |
| 584 | case -ENOENT: |
| 585 | error = 0; |
| 586 | break; |
| 587 | case 0: |
| 588 | return -EEXIST; |
| 589 | default: |
| 590 | return error; |
| 591 | } |
| 592 | |
| 593 | if (dip->i_di.di_entries == (uint32_t)-1) |
| 594 | return -EFBIG; |
| 595 | if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1) |
| 596 | return -EMLINK; |
| 597 | |
| 598 | return 0; |
| 599 | } |
| 600 | |
| 601 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, |
| 602 | unsigned int *uid, unsigned int *gid) |
| 603 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 604 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 605 | (dip->i_di.di_mode & S_ISUID) && |
| 606 | dip->i_di.di_uid) { |
| 607 | if (S_ISDIR(*mode)) |
| 608 | *mode |= S_ISUID; |
| 609 | else if (dip->i_di.di_uid != current->fsuid) |
| 610 | *mode &= ~07111; |
| 611 | *uid = dip->i_di.di_uid; |
| 612 | } else |
| 613 | *uid = current->fsuid; |
| 614 | |
| 615 | if (dip->i_di.di_mode & S_ISGID) { |
| 616 | if (S_ISDIR(*mode)) |
| 617 | *mode |= S_ISGID; |
| 618 | *gid = dip->i_di.di_gid; |
| 619 | } else |
| 620 | *gid = current->fsgid; |
| 621 | } |
| 622 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 623 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 624 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 625 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 626 | int error; |
| 627 | |
| 628 | gfs2_alloc_get(dip); |
| 629 | |
| 630 | dip->i_alloc.al_requested = RES_DINODE; |
| 631 | error = gfs2_inplace_reserve(dip); |
| 632 | if (error) |
| 633 | goto out; |
| 634 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 635 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 636 | if (error) |
| 637 | goto out_ipreserv; |
| 638 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 639 | inum->no_addr = gfs2_alloc_di(dip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 640 | |
| 641 | gfs2_trans_end(sdp); |
| 642 | |
| 643 | out_ipreserv: |
| 644 | gfs2_inplace_release(dip); |
| 645 | |
| 646 | out: |
| 647 | gfs2_alloc_put(dip); |
| 648 | |
| 649 | return error; |
| 650 | } |
| 651 | |
| 652 | /** |
| 653 | * init_dinode - Fill in a new dinode structure |
| 654 | * @dip: the directory this inode is being created in |
| 655 | * @gl: The glock covering the new inode |
| 656 | * @inum: the inode number |
| 657 | * @mode: the file permissions |
| 658 | * @uid: |
| 659 | * @gid: |
| 660 | * |
| 661 | */ |
| 662 | |
| 663 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, |
| 664 | struct gfs2_inum *inum, unsigned int mode, |
| 665 | unsigned int uid, unsigned int gid) |
| 666 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 667 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
Steven Whitehouse | b96ca4f | 2006-01-18 10:57:10 +0000 | [diff] [blame] | 668 | struct gfs2_dinode *di; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 669 | struct buffer_head *dibh; |
| 670 | |
| 671 | dibh = gfs2_meta_new(gl, inum->no_addr); |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 672 | gfs2_trans_add_bh(gl, dibh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 673 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
| 674 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
Steven Whitehouse | b96ca4f | 2006-01-18 10:57:10 +0000 | [diff] [blame] | 675 | di = (struct gfs2_dinode *)dibh->b_data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 676 | |
Steven Whitehouse | 2442a09 | 2006-01-30 11:49:32 +0000 | [diff] [blame] | 677 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
| 678 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); |
Steven Whitehouse | b96ca4f | 2006-01-18 10:57:10 +0000 | [diff] [blame] | 679 | di->di_mode = cpu_to_be32(mode); |
| 680 | di->di_uid = cpu_to_be32(uid); |
| 681 | di->di_gid = cpu_to_be32(gid); |
| 682 | di->di_nlink = cpu_to_be32(0); |
| 683 | di->di_size = cpu_to_be64(0); |
| 684 | di->di_blocks = cpu_to_be64(1); |
| 685 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); |
| 686 | di->di_major = di->di_minor = cpu_to_be32(0); |
| 687 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
| 688 | di->__pad[0] = di->__pad[1] = 0; |
| 689 | di->di_flags = cpu_to_be32(0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 690 | |
| 691 | if (S_ISREG(mode)) { |
| 692 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || |
| 693 | gfs2_tune_get(sdp, gt_new_files_jdata)) |
Steven Whitehouse | b96ca4f | 2006-01-18 10:57:10 +0000 | [diff] [blame] | 694 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 695 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
| 696 | gfs2_tune_get(sdp, gt_new_files_directio)) |
Steven Whitehouse | b96ca4f | 2006-01-18 10:57:10 +0000 | [diff] [blame] | 697 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 698 | } else if (S_ISDIR(mode)) { |
Steven Whitehouse | 568f4c9 | 2006-02-27 12:00:42 -0500 | [diff] [blame] | 699 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
| 700 | GFS2_DIF_INHERIT_DIRECTIO); |
| 701 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
| 702 | GFS2_DIF_INHERIT_JDATA); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 703 | } |
| 704 | |
Steven Whitehouse | b96ca4f | 2006-01-18 10:57:10 +0000 | [diff] [blame] | 705 | di->__pad1 = 0; |
| 706 | di->di_height = cpu_to_be32(0); |
| 707 | di->__pad2 = 0; |
| 708 | di->__pad3 = 0; |
| 709 | di->di_depth = cpu_to_be16(0); |
| 710 | di->di_entries = cpu_to_be32(0); |
| 711 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
| 712 | di->di_eattr = cpu_to_be64(0); |
| 713 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
| 714 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 715 | brelse(dibh); |
| 716 | } |
| 717 | |
| 718 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 719 | unsigned int mode, struct gfs2_inum *inum) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 720 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 721 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 722 | unsigned int uid, gid; |
| 723 | int error; |
| 724 | |
| 725 | munge_mode_uid_gid(dip, &mode, &uid, &gid); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 726 | gfs2_alloc_get(dip); |
| 727 | |
| 728 | error = gfs2_quota_lock(dip, uid, gid); |
| 729 | if (error) |
| 730 | goto out; |
| 731 | |
| 732 | error = gfs2_quota_check(dip, uid, gid); |
| 733 | if (error) |
| 734 | goto out_quota; |
| 735 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 736 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 737 | if (error) |
| 738 | goto out_quota; |
| 739 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 740 | init_dinode(dip, gl, inum, mode, uid, gid); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 741 | gfs2_quota_change(dip, +1, uid, gid); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 742 | gfs2_trans_end(sdp); |
| 743 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 744 | out_quota: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 745 | gfs2_quota_unlock(dip); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 746 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 747 | gfs2_alloc_put(dip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 748 | return error; |
| 749 | } |
| 750 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 751 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
| 752 | struct gfs2_inode *ip) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 753 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 754 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 755 | struct gfs2_alloc *al; |
| 756 | int alloc_required; |
| 757 | struct buffer_head *dibh; |
| 758 | int error; |
| 759 | |
| 760 | al = gfs2_alloc_get(dip); |
| 761 | |
| 762 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| 763 | if (error) |
| 764 | goto fail; |
| 765 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 766 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 767 | if (alloc_required < 0) |
| 768 | goto fail; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 769 | if (alloc_required) { |
| 770 | error = gfs2_quota_check(dip, dip->i_di.di_uid, |
| 771 | dip->i_di.di_gid); |
| 772 | if (error) |
| 773 | goto fail_quota_locks; |
| 774 | |
| 775 | al->al_requested = sdp->sd_max_dirres; |
| 776 | |
| 777 | error = gfs2_inplace_reserve(dip); |
| 778 | if (error) |
| 779 | goto fail_quota_locks; |
| 780 | |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 781 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 782 | al->al_rgd->rd_ri.ri_length + |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 783 | 2 * RES_DINODE + |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 784 | RES_STATFS + RES_QUOTA, 0); |
| 785 | if (error) |
| 786 | goto fail_ipreserv; |
| 787 | } else { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 788 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 789 | if (error) |
| 790 | goto fail_quota_locks; |
| 791 | } |
| 792 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 793 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 794 | if (error) |
| 795 | goto fail_end_trans; |
| 796 | |
| 797 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 798 | if (error) |
| 799 | goto fail_end_trans; |
| 800 | ip->i_di.di_nlink = 1; |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 801 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 802 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 803 | brelse(dibh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 804 | return 0; |
| 805 | |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 806 | fail_end_trans: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 807 | gfs2_trans_end(sdp); |
| 808 | |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 809 | fail_ipreserv: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 810 | if (dip->i_alloc.al_rgd) |
| 811 | gfs2_inplace_release(dip); |
| 812 | |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 813 | fail_quota_locks: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 814 | gfs2_quota_unlock(dip); |
| 815 | |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 816 | fail: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 817 | gfs2_alloc_put(dip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 818 | return error; |
| 819 | } |
| 820 | |
| 821 | /** |
| 822 | * gfs2_createi - Create a new inode |
| 823 | * @ghs: An array of two holders |
| 824 | * @name: The name of the new file |
| 825 | * @mode: the permissions on the new inode |
| 826 | * |
| 827 | * @ghs[0] is an initialized holder for the directory |
| 828 | * @ghs[1] is the holder for the inode lock |
| 829 | * |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 830 | * If the return value is not NULL, the glocks on both the directory and the new |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 831 | * file are held. A transaction has been started and an inplace reservation |
| 832 | * is held, as well. |
| 833 | * |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 834 | * Returns: An inode |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 835 | */ |
| 836 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 837 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
Steven Whitehouse | 568f4c9 | 2006-02-27 12:00:42 -0500 | [diff] [blame] | 838 | unsigned int mode) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 839 | { |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 840 | struct inode *inode; |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 841 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 842 | struct inode *dir = &dip->i_inode; |
| 843 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
| 844 | struct gfs2_inum inum; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 845 | int error; |
| 846 | |
| 847 | if (!name->len || name->len > GFS2_FNAMESIZE) |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 848 | return ERR_PTR(-ENAMETOOLONG); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 849 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 850 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
| 851 | error = gfs2_glock_nq(ghs); |
| 852 | if (error) |
| 853 | goto fail; |
| 854 | |
| 855 | error = create_ok(dip, name, mode); |
| 856 | if (error) |
| 857 | goto fail_gunlock; |
| 858 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 859 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 860 | if (error) |
| 861 | goto fail_gunlock; |
| 862 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 863 | error = alloc_dinode(dip, &inum); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 864 | if (error) |
| 865 | goto fail_gunlock; |
| 866 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 867 | if (inum.no_addr < dip->i_num.no_addr) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 868 | gfs2_glock_dq(ghs); |
| 869 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 870 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 871 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
| 872 | GL_SKIP, ghs + 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 873 | if (error) { |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 874 | return ERR_PTR(error); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 875 | } |
| 876 | |
| 877 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
| 878 | error = gfs2_glock_nq(ghs); |
| 879 | if (error) { |
| 880 | gfs2_glock_dq_uninit(ghs + 1); |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 881 | return ERR_PTR(error); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 882 | } |
| 883 | |
| 884 | error = create_ok(dip, name, mode); |
| 885 | if (error) |
| 886 | goto fail_gunlock2; |
| 887 | } else { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 888 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 889 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
| 890 | GL_SKIP, ghs + 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 891 | if (error) |
| 892 | goto fail_gunlock; |
| 893 | } |
| 894 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 895 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 896 | if (error) |
| 897 | goto fail_gunlock2; |
| 898 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 899 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
| 900 | if (IS_ERR(inode)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 901 | goto fail_gunlock2; |
| 902 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 903 | error = gfs2_inode_refresh(GFS2_I(inode)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 904 | if (error) |
| 905 | goto fail_iput; |
| 906 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 907 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 908 | if (error) |
| 909 | goto fail_iput; |
| 910 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 911 | error = link_dinode(dip, name, GFS2_I(inode)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 912 | if (error) |
| 913 | goto fail_iput; |
| 914 | |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 915 | if (!inode) |
| 916 | return ERR_PTR(-ENOMEM); |
| 917 | return inode; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 918 | |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 919 | fail_iput: |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 920 | iput(inode); |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 921 | fail_gunlock2: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 922 | gfs2_glock_dq_uninit(ghs + 1); |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 923 | fail_gunlock: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 924 | gfs2_glock_dq(ghs); |
Steven Whitehouse | 320dd10 | 2006-05-18 16:25:27 -0400 | [diff] [blame] | 925 | fail: |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 926 | return ERR_PTR(error); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 927 | } |
| 928 | |
| 929 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 930 | * gfs2_rmdiri - Remove a directory |
| 931 | * @dip: The parent directory of the directory to be removed |
| 932 | * @name: The name of the directory to be removed |
| 933 | * @ip: The GFS2 inode of the directory to be removed |
| 934 | * |
| 935 | * Assumes Glocks on dip and ip are held |
| 936 | * |
| 937 | * Returns: errno |
| 938 | */ |
| 939 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 940 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
| 941 | struct gfs2_inode *ip) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 942 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 943 | struct qstr dotname; |
| 944 | int error; |
| 945 | |
| 946 | if (ip->i_di.di_entries != 2) { |
| 947 | if (gfs2_consist_inode(ip)) |
| 948 | gfs2_dinode_print(&ip->i_di); |
| 949 | return -EIO; |
| 950 | } |
| 951 | |
| 952 | error = gfs2_dir_del(dip, name); |
| 953 | if (error) |
| 954 | return error; |
| 955 | |
| 956 | error = gfs2_change_nlink(dip, -1); |
| 957 | if (error) |
| 958 | return error; |
| 959 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 960 | gfs2_str2qstr(&dotname, "."); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 961 | error = gfs2_dir_del(ip, &dotname); |
| 962 | if (error) |
| 963 | return error; |
| 964 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 965 | gfs2_str2qstr(&dotname, ".."); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 966 | error = gfs2_dir_del(ip, &dotname); |
| 967 | if (error) |
| 968 | return error; |
| 969 | |
| 970 | error = gfs2_change_nlink(ip, -2); |
| 971 | if (error) |
| 972 | return error; |
| 973 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 974 | return error; |
| 975 | } |
| 976 | |
| 977 | /* |
| 978 | * gfs2_unlink_ok - check to see that a inode is still in a directory |
| 979 | * @dip: the directory |
| 980 | * @name: the name of the file |
| 981 | * @ip: the inode |
| 982 | * |
| 983 | * Assumes that the lock on (at least) @dip is held. |
| 984 | * |
| 985 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't |
| 986 | */ |
| 987 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 988 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 989 | struct gfs2_inode *ip) |
| 990 | { |
| 991 | struct gfs2_inum inum; |
| 992 | unsigned int type; |
| 993 | int error; |
| 994 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 995 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 996 | return -EPERM; |
| 997 | |
| 998 | if ((dip->i_di.di_mode & S_ISVTX) && |
| 999 | dip->i_di.di_uid != current->fsuid && |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1000 | ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1001 | return -EPERM; |
| 1002 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1003 | if (IS_APPEND(&dip->i_inode)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1004 | return -EPERM; |
| 1005 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1006 | error = gfs2_repermission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1007 | if (error) |
| 1008 | return error; |
| 1009 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1010 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1011 | if (error) |
| 1012 | return error; |
| 1013 | |
| 1014 | if (!gfs2_inum_equal(&inum, &ip->i_num)) |
| 1015 | return -ENOENT; |
| 1016 | |
| 1017 | if (IF2DT(ip->i_di.di_mode) != type) { |
| 1018 | gfs2_consist_inode(dip); |
| 1019 | return -EIO; |
| 1020 | } |
| 1021 | |
| 1022 | return 0; |
| 1023 | } |
| 1024 | |
| 1025 | /* |
| 1026 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory |
| 1027 | * @this: move this |
| 1028 | * @to: to here |
| 1029 | * |
| 1030 | * Follow @to back to the root and make sure we don't encounter @this |
| 1031 | * Assumes we already hold the rename lock. |
| 1032 | * |
| 1033 | * Returns: errno |
| 1034 | */ |
| 1035 | |
| 1036 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) |
| 1037 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1038 | struct inode *dir = &to->i_inode; |
Steven Whitehouse | c9fd430 | 2006-03-01 15:31:02 -0500 | [diff] [blame] | 1039 | struct super_block *sb = dir->i_sb; |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 1040 | struct inode *tmp; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1041 | struct qstr dotdot; |
| 1042 | int error = 0; |
| 1043 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1044 | gfs2_str2qstr(&dotdot, ".."); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1045 | |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 1046 | igrab(dir); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1047 | |
| 1048 | for (;;) { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1049 | if (dir == &this->i_inode) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1050 | error = -EINVAL; |
| 1051 | break; |
| 1052 | } |
Steven Whitehouse | c9fd430 | 2006-03-01 15:31:02 -0500 | [diff] [blame] | 1053 | if (dir == sb->s_root->d_inode) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1054 | error = 0; |
| 1055 | break; |
| 1056 | } |
| 1057 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1058 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
| 1059 | if (IS_ERR(tmp)) { |
| 1060 | error = PTR_ERR(tmp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1061 | break; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1062 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1063 | |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 1064 | iput(dir); |
| 1065 | dir = tmp; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1066 | } |
| 1067 | |
Steven Whitehouse | 7359a19 | 2006-02-13 12:27:43 +0000 | [diff] [blame] | 1068 | iput(dir); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1069 | |
| 1070 | return error; |
| 1071 | } |
| 1072 | |
| 1073 | /** |
| 1074 | * gfs2_readlinki - return the contents of a symlink |
| 1075 | * @ip: the symlink's inode |
| 1076 | * @buf: a pointer to the buffer to be filled |
| 1077 | * @len: a pointer to the length of @buf |
| 1078 | * |
| 1079 | * If @buf is too small, a piece of memory is kmalloc()ed and needs |
| 1080 | * to be freed by the caller. |
| 1081 | * |
| 1082 | * Returns: errno |
| 1083 | */ |
| 1084 | |
| 1085 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) |
| 1086 | { |
| 1087 | struct gfs2_holder i_gh; |
| 1088 | struct buffer_head *dibh; |
| 1089 | unsigned int x; |
| 1090 | int error; |
| 1091 | |
| 1092 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); |
| 1093 | error = gfs2_glock_nq_atime(&i_gh); |
| 1094 | if (error) { |
| 1095 | gfs2_holder_uninit(&i_gh); |
| 1096 | return error; |
| 1097 | } |
| 1098 | |
| 1099 | if (!ip->i_di.di_size) { |
| 1100 | gfs2_consist_inode(ip); |
| 1101 | error = -EIO; |
| 1102 | goto out; |
| 1103 | } |
| 1104 | |
| 1105 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 1106 | if (error) |
| 1107 | goto out; |
| 1108 | |
| 1109 | x = ip->i_di.di_size + 1; |
| 1110 | if (x > *len) { |
| 1111 | *buf = kmalloc(x, GFP_KERNEL); |
| 1112 | if (!*buf) { |
| 1113 | error = -ENOMEM; |
| 1114 | goto out_brelse; |
| 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); |
| 1119 | *len = x; |
| 1120 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1121 | out_brelse: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1122 | brelse(dibh); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1123 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1124 | gfs2_glock_dq_uninit(&i_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1125 | return error; |
| 1126 | } |
| 1127 | |
| 1128 | /** |
| 1129 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and |
| 1130 | * conditionally update the inode's atime |
| 1131 | * @gh: the holder to acquire |
| 1132 | * |
| 1133 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap |
| 1134 | * Update if the difference between the current time and the inode's current |
| 1135 | * atime is greater than an interval specified at mount. |
| 1136 | * |
| 1137 | * Returns: errno |
| 1138 | */ |
| 1139 | |
| 1140 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) |
| 1141 | { |
| 1142 | struct gfs2_glock *gl = gh->gh_gl; |
| 1143 | struct gfs2_sbd *sdp = gl->gl_sbd; |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 1144 | struct gfs2_inode *ip = gl->gl_object; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1145 | int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
| 1146 | unsigned int state; |
| 1147 | int flags; |
| 1148 | int error; |
| 1149 | |
| 1150 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || |
| 1151 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || |
| 1152 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) |
| 1153 | return -EINVAL; |
| 1154 | |
| 1155 | state = gh->gh_state; |
| 1156 | flags = gh->gh_flags; |
| 1157 | |
| 1158 | error = gfs2_glock_nq(gh); |
| 1159 | if (error) |
| 1160 | return error; |
| 1161 | |
| 1162 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || |
| 1163 | (sdp->sd_vfs->s_flags & MS_RDONLY)) |
| 1164 | return 0; |
| 1165 | |
| 1166 | curtime = get_seconds(); |
| 1167 | if (curtime - ip->i_di.di_atime >= quantum) { |
| 1168 | gfs2_glock_dq(gh); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 1169 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
| 1170 | gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1171 | error = gfs2_glock_nq(gh); |
| 1172 | if (error) |
| 1173 | return error; |
| 1174 | |
| 1175 | /* Verify that atime hasn't been updated while we were |
| 1176 | trying to get exclusive lock. */ |
| 1177 | |
| 1178 | curtime = get_seconds(); |
| 1179 | if (curtime - ip->i_di.di_atime >= quantum) { |
| 1180 | struct buffer_head *dibh; |
| 1181 | |
| 1182 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| 1183 | if (error == -EROFS) |
| 1184 | return 0; |
| 1185 | if (error) |
| 1186 | goto fail; |
| 1187 | |
| 1188 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 1189 | if (error) |
| 1190 | goto fail_end_trans; |
| 1191 | |
| 1192 | ip->i_di.di_atime = curtime; |
| 1193 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 1194 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1195 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 1196 | brelse(dibh); |
| 1197 | |
| 1198 | gfs2_trans_end(sdp); |
| 1199 | } |
| 1200 | |
| 1201 | /* If someone else has asked for the glock, |
| 1202 | unlock and let them have it. Then reacquire |
| 1203 | in the original state. */ |
| 1204 | if (gfs2_glock_is_blocking(gl)) { |
| 1205 | gfs2_glock_dq(gh); |
| 1206 | gfs2_holder_reinit(state, flags, gh); |
| 1207 | return gfs2_glock_nq(gh); |
| 1208 | } |
| 1209 | } |
| 1210 | |
| 1211 | return 0; |
| 1212 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1213 | fail_end_trans: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1214 | gfs2_trans_end(sdp); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1215 | fail: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1216 | gfs2_glock_dq(gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1217 | return error; |
| 1218 | } |
| 1219 | |
| 1220 | /** |
| 1221 | * glock_compare_atime - Compare two struct gfs2_glock structures for sort |
| 1222 | * @arg_a: the first structure |
| 1223 | * @arg_b: the second structure |
| 1224 | * |
| 1225 | * Returns: 1 if A > B |
| 1226 | * -1 if A < B |
| 1227 | * 0 if A = B |
| 1228 | */ |
| 1229 | |
| 1230 | static int glock_compare_atime(const void *arg_a, const void *arg_b) |
| 1231 | { |
| 1232 | struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; |
| 1233 | struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; |
| 1234 | struct lm_lockname *a = &gh_a->gh_gl->gl_name; |
| 1235 | struct lm_lockname *b = &gh_b->gh_gl->gl_name; |
| 1236 | int ret = 0; |
| 1237 | |
| 1238 | if (a->ln_number > b->ln_number) |
| 1239 | ret = 1; |
| 1240 | else if (a->ln_number < b->ln_number) |
| 1241 | ret = -1; |
| 1242 | else { |
| 1243 | if (gh_a->gh_state == LM_ST_SHARED && |
| 1244 | gh_b->gh_state == LM_ST_EXCLUSIVE) |
| 1245 | ret = 1; |
| 1246 | else if (gh_a->gh_state == LM_ST_SHARED && |
| 1247 | (gh_b->gh_flags & GL_ATIME)) |
| 1248 | ret = 1; |
| 1249 | } |
| 1250 | |
| 1251 | return ret; |
| 1252 | } |
| 1253 | |
| 1254 | /** |
| 1255 | * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an |
| 1256 | * atime update |
| 1257 | * @num_gh: the number of structures |
| 1258 | * @ghs: an array of struct gfs2_holder structures |
| 1259 | * |
| 1260 | * Returns: 0 on success (all glocks acquired), |
| 1261 | * errno on failure (no glocks acquired) |
| 1262 | */ |
| 1263 | |
| 1264 | int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) |
| 1265 | { |
| 1266 | struct gfs2_holder **p; |
| 1267 | unsigned int x; |
| 1268 | int error = 0; |
| 1269 | |
| 1270 | if (!num_gh) |
| 1271 | return 0; |
| 1272 | |
| 1273 | if (num_gh == 1) { |
| 1274 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
| 1275 | if (ghs->gh_flags & GL_ATIME) |
| 1276 | error = gfs2_glock_nq_atime(ghs); |
| 1277 | else |
| 1278 | error = gfs2_glock_nq(ghs); |
| 1279 | return error; |
| 1280 | } |
| 1281 | |
| 1282 | p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); |
| 1283 | if (!p) |
| 1284 | return -ENOMEM; |
| 1285 | |
| 1286 | for (x = 0; x < num_gh; x++) |
| 1287 | p[x] = &ghs[x]; |
| 1288 | |
| 1289 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); |
| 1290 | |
| 1291 | for (x = 0; x < num_gh; x++) { |
| 1292 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
| 1293 | |
| 1294 | if (p[x]->gh_flags & GL_ATIME) |
| 1295 | error = gfs2_glock_nq_atime(p[x]); |
| 1296 | else |
| 1297 | error = gfs2_glock_nq(p[x]); |
| 1298 | |
| 1299 | if (error) { |
| 1300 | while (x--) |
| 1301 | gfs2_glock_dq(p[x]); |
| 1302 | break; |
| 1303 | } |
| 1304 | } |
| 1305 | |
| 1306 | kfree(p); |
| 1307 | |
| 1308 | return error; |
| 1309 | } |
| 1310 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1311 | |
| 1312 | static int |
| 1313 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) |
| 1314 | { |
| 1315 | struct buffer_head *dibh; |
| 1316 | int error; |
| 1317 | |
| 1318 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 1319 | if (!error) { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1320 | error = inode_setattr(&ip->i_inode, attr); |
| 1321 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1322 | gfs2_inode_attr_out(ip); |
| 1323 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 1324 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1325 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 1326 | brelse(dibh); |
| 1327 | } |
| 1328 | return error; |
| 1329 | } |
| 1330 | |
| 1331 | /** |
| 1332 | * gfs2_setattr_simple - |
| 1333 | * @ip: |
| 1334 | * @attr: |
| 1335 | * |
| 1336 | * Called with a reference on the vnode. |
| 1337 | * |
| 1338 | * Returns: errno |
| 1339 | */ |
| 1340 | |
| 1341 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) |
| 1342 | { |
| 1343 | int error; |
| 1344 | |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 1345 | if (current->journal_info) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1346 | return __gfs2_setattr_simple(ip, attr); |
| 1347 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1348 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1349 | if (error) |
| 1350 | return error; |
| 1351 | |
| 1352 | error = __gfs2_setattr_simple(ip, attr); |
| 1353 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame^] | 1354 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1355 | |
| 1356 | return error; |
| 1357 | } |
| 1358 | |
| 1359 | int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd) |
| 1360 | { |
| 1361 | return permission(inode, mask, nd); |
| 1362 | } |
| 1363 | |