2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/posix_acl.h>
16 #include <linux/sort.h>
17 #include <linux/gfs2_ondisk.h>
18 #include <linux/crc32.h>
19 #include <linux/lm_interface.h>
32 #include "ops_address.h"
34 #include "ops_inode.h"
41 * gfs2_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
47 void gfs2_inode_attr_in(struct gfs2_inode
*ip
)
49 struct inode
*inode
= &ip
->i_inode
;
50 struct gfs2_dinode
*di
= &ip
->i_di
;
52 inode
->i_ino
= ip
->i_num
.no_addr
;
54 switch (di
->di_mode
& S_IFMT
) {
57 inode
->i_rdev
= MKDEV(di
->di_major
, di
->di_minor
);
64 inode
->i_mode
= di
->di_mode
;
65 inode
->i_nlink
= di
->di_nlink
;
66 inode
->i_uid
= di
->di_uid
;
67 inode
->i_gid
= di
->di_gid
;
68 i_size_write(inode
, di
->di_size
);
69 inode
->i_atime
.tv_sec
= di
->di_atime
;
70 inode
->i_mtime
.tv_sec
= di
->di_mtime
;
71 inode
->i_ctime
.tv_sec
= di
->di_ctime
;
72 inode
->i_atime
.tv_nsec
= 0;
73 inode
->i_mtime
.tv_nsec
= 0;
74 inode
->i_ctime
.tv_nsec
= 0;
75 inode
->i_blksize
= PAGE_SIZE
;
76 inode
->i_blocks
= di
->di_blocks
<<
77 (GFS2_SB(inode
)->sd_sb
.sb_bsize_shift
- GFS2_BASIC_BLOCK_SHIFT
);
79 if (di
->di_flags
& GFS2_DIF_IMMUTABLE
)
80 inode
->i_flags
|= S_IMMUTABLE
;
82 inode
->i_flags
&= ~S_IMMUTABLE
;
84 if (di
->di_flags
& GFS2_DIF_APPENDONLY
)
85 inode
->i_flags
|= S_APPEND
;
87 inode
->i_flags
&= ~S_APPEND
;
91 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
94 * Only copy out the attributes that we want the VFS layer
95 * to be able to modify.
98 void gfs2_inode_attr_out(struct gfs2_inode
*ip
)
100 struct inode
*inode
= &ip
->i_inode
;
101 struct gfs2_dinode
*di
= &ip
->i_di
;
102 gfs2_assert_withdraw(GFS2_SB(inode
),
103 (di
->di_mode
& S_IFMT
) == (inode
->i_mode
& S_IFMT
));
104 di
->di_mode
= inode
->i_mode
;
105 di
->di_uid
= inode
->i_uid
;
106 di
->di_gid
= inode
->i_gid
;
107 di
->di_atime
= inode
->i_atime
.tv_sec
;
108 di
->di_mtime
= inode
->i_mtime
.tv_sec
;
109 di
->di_ctime
= inode
->i_ctime
.tv_sec
;
112 static int iget_test(struct inode
*inode
, void *opaque
)
114 struct gfs2_inode
*ip
= GFS2_I(inode
);
115 struct gfs2_inum
*inum
= opaque
;
117 if (ip
&& ip
->i_num
.no_addr
== inum
->no_addr
)
123 static int iget_set(struct inode
*inode
, void *opaque
)
125 struct gfs2_inode
*ip
= GFS2_I(inode
);
126 struct gfs2_inum
*inum
= opaque
;
132 struct inode
*gfs2_ilookup(struct super_block
*sb
, struct gfs2_inum
*inum
)
134 return ilookup5(sb
, (unsigned long)inum
->no_formal_ino
,
138 static struct inode
*gfs2_iget(struct super_block
*sb
, struct gfs2_inum
*inum
)
140 return iget5_locked(sb
, (unsigned long)inum
->no_formal_ino
,
141 iget_test
, iget_set
, inum
);
145 * gfs2_inode_lookup - Lookup an inode
146 * @sb: The super block
147 * @inum: The inode number
148 * @type: The type of the inode
150 * Returns: A VFS inode, or an error
153 struct inode
*gfs2_inode_lookup(struct super_block
*sb
, struct gfs2_inum
*inum
, unsigned int type
)
155 struct inode
*inode
= gfs2_iget(sb
, inum
);
156 struct gfs2_inode
*ip
= GFS2_I(inode
);
157 struct gfs2_glock
*io_gl
;
160 if (inode
->i_state
& I_NEW
) {
161 struct gfs2_sbd
*sdp
= GFS2_SB(inode
);
162 umode_t mode
= DT2IF(type
);
163 inode
->u
.generic_ip
= ip
;
164 inode
->i_mode
= mode
;
167 inode
->i_op
= &gfs2_file_iops
;
168 inode
->i_fop
= &gfs2_file_fops
;
169 inode
->i_mapping
->a_ops
= &gfs2_file_aops
;
170 } else if (S_ISDIR(mode
)) {
171 inode
->i_op
= &gfs2_dir_iops
;
172 inode
->i_fop
= &gfs2_dir_fops
;
173 } else if (S_ISLNK(mode
)) {
174 inode
->i_op
= &gfs2_symlink_iops
;
176 inode
->i_op
= &gfs2_dev_iops
;
179 error
= gfs2_glock_get(sdp
, inum
->no_addr
, &gfs2_inode_glops
, CREATE
, &ip
->i_gl
);
182 ip
->i_gl
->gl_object
= ip
;
184 error
= gfs2_glock_get(sdp
, inum
->no_addr
, &gfs2_iopen_glops
, CREATE
, &io_gl
);
188 ip
->i_vn
= ip
->i_gl
->gl_vn
- 1;
189 error
= gfs2_glock_nq_init(io_gl
, LM_ST_SHARED
, GL_EXACT
, &ip
->i_iopen_gh
);
193 gfs2_glock_put(io_gl
);
194 unlock_new_inode(inode
);
199 gfs2_glock_put(io_gl
);
201 ip
->i_gl
->gl_object
= NULL
;
202 gfs2_glock_put(ip
->i_gl
);
205 return ERR_PTR(error
);
209 * gfs2_inode_refresh - Refresh the incore copy of the dinode
210 * @ip: The GFS2 inode
215 int gfs2_inode_refresh(struct gfs2_inode
*ip
)
217 struct buffer_head
*dibh
;
220 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
224 if (gfs2_metatype_check(GFS2_SB(&ip
->i_inode
), dibh
, GFS2_METATYPE_DI
)) {
229 gfs2_dinode_in(&ip
->i_di
, dibh
->b_data
);
233 if (ip
->i_num
.no_addr
!= ip
->i_di
.di_num
.no_addr
) {
234 if (gfs2_consist_inode(ip
))
235 gfs2_dinode_print(&ip
->i_di
);
238 if (ip
->i_num
.no_formal_ino
!= ip
->i_di
.di_num
.no_formal_ino
)
241 ip
->i_vn
= ip
->i_gl
->gl_vn
;
246 int gfs2_dinode_dealloc(struct gfs2_inode
*ip
)
248 struct gfs2_sbd
*sdp
= GFS2_SB(&ip
->i_inode
);
249 struct gfs2_alloc
*al
;
250 struct gfs2_rgrpd
*rgd
;
253 if (ip
->i_di
.di_blocks
!= 1) {
254 if (gfs2_consist_inode(ip
))
255 gfs2_dinode_print(&ip
->i_di
);
259 al
= gfs2_alloc_get(ip
);
261 error
= gfs2_quota_hold(ip
, NO_QUOTA_CHANGE
, NO_QUOTA_CHANGE
);
265 error
= gfs2_rindex_hold(sdp
, &al
->al_ri_gh
);
269 rgd
= gfs2_blk2rgrpd(sdp
, ip
->i_num
.no_addr
);
271 gfs2_consist_inode(ip
);
273 goto out_rindex_relse
;
276 error
= gfs2_glock_nq_init(rgd
->rd_gl
, LM_ST_EXCLUSIVE
, 0,
279 goto out_rindex_relse
;
281 error
= gfs2_trans_begin(sdp
, RES_RG_BIT
+ RES_STATFS
+ RES_QUOTA
, 1);
285 gfs2_trans_add_gl(ip
->i_gl
);
287 gfs2_free_di(rgd
, ip
);
290 clear_bit(GLF_STICKY
, &ip
->i_gl
->gl_flags
);
293 gfs2_glock_dq_uninit(&al
->al_rgd_gh
);
295 gfs2_glock_dq_uninit(&al
->al_ri_gh
);
297 gfs2_quota_unhold(ip
);
304 * gfs2_change_nlink - Change nlink count on inode
305 * @ip: The GFS2 inode
306 * @diff: The change in the nlink count required
311 int gfs2_change_nlink(struct gfs2_inode
*ip
, int diff
)
313 struct gfs2_sbd
*sdp
= ip
->i_inode
.i_sb
->s_fs_info
;
314 struct buffer_head
*dibh
;
318 BUG_ON(ip
->i_di
.di_nlink
!= ip
->i_inode
.i_nlink
);
319 nlink
= ip
->i_di
.di_nlink
+ diff
;
321 /* If we are reducing the nlink count, but the new value ends up being
322 bigger than the old one, we must have underflowed. */
323 if (diff
< 0 && nlink
> ip
->i_di
.di_nlink
) {
324 if (gfs2_consist_inode(ip
))
325 gfs2_dinode_print(&ip
->i_di
);
329 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
333 ip
->i_di
.di_nlink
= nlink
;
334 ip
->i_di
.di_ctime
= get_seconds();
335 ip
->i_inode
.i_nlink
= nlink
;
337 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
338 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
340 mark_inode_dirty(&ip
->i_inode
);
342 if (ip
->i_di
.di_nlink
== 0) {
343 struct gfs2_rgrpd
*rgd
;
344 struct gfs2_holder ri_gh
, rg_gh
;
346 error
= gfs2_rindex_hold(sdp
, &ri_gh
);
350 rgd
= gfs2_blk2rgrpd(sdp
, ip
->i_num
.no_addr
);
353 error
= gfs2_glock_nq_init(rgd
->rd_gl
, LM_ST_EXCLUSIVE
, 0, &rg_gh
);
357 gfs2_unlink_di(&ip
->i_inode
); /* mark inode unlinked */
358 gfs2_glock_dq_uninit(&rg_gh
);
360 gfs2_glock_dq_uninit(&ri_gh
);
366 struct inode
*gfs2_lookup_simple(struct inode
*dip
, const char *name
)
369 gfs2_str2qstr(&qstr
, name
);
370 return gfs2_lookupi(dip
, &qstr
, 1, NULL
);
375 * gfs2_lookupi - Look up a filename in a directory and return its inode
376 * @d_gh: An initialized holder for the directory glock
377 * @name: The name of the inode to look for
378 * @is_root: If 1, ignore the caller's permissions
379 * @i_gh: An uninitialized holder for the new inode glock
381 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
387 struct inode
*gfs2_lookupi(struct inode
*dir
, const struct qstr
*name
,
388 int is_root
, struct nameidata
*nd
)
390 struct super_block
*sb
= dir
->i_sb
;
391 struct gfs2_inode
*dip
= GFS2_I(dir
);
392 struct gfs2_holder d_gh
;
393 struct gfs2_inum inum
;
396 struct inode
*inode
= NULL
;
398 if (!name
->len
|| name
->len
> GFS2_FNAMESIZE
)
399 return ERR_PTR(-ENAMETOOLONG
);
401 if ((name
->len
== 1 && memcmp(name
->name
, ".", 1) == 0) ||
402 (name
->len
== 2 && memcmp(name
->name
, "..", 2) == 0 &&
403 dir
== sb
->s_root
->d_inode
)) {
408 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
, 0, &d_gh
);
410 return ERR_PTR(error
);
413 error
= permission(dir
, MAY_EXEC
, NULL
);
418 error
= gfs2_dir_search(dir
, name
, &inum
, &type
);
422 inode
= gfs2_inode_lookup(sb
, &inum
, type
);
425 gfs2_glock_dq_uninit(&d_gh
);
426 if (error
== -ENOENT
)
431 static int pick_formal_ino_1(struct gfs2_sbd
*sdp
, u64
*formal_ino
)
433 struct gfs2_inode
*ip
= GFS2_I(sdp
->sd_ir_inode
);
434 struct buffer_head
*bh
;
435 struct gfs2_inum_range ir
;
438 error
= gfs2_trans_begin(sdp
, RES_DINODE
, 0);
441 mutex_lock(&sdp
->sd_inum_mutex
);
443 error
= gfs2_meta_inode_buffer(ip
, &bh
);
445 mutex_unlock(&sdp
->sd_inum_mutex
);
450 gfs2_inum_range_in(&ir
, bh
->b_data
+ sizeof(struct gfs2_dinode
));
453 *formal_ino
= ir
.ir_start
++;
455 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
456 gfs2_inum_range_out(&ir
,
457 bh
->b_data
+ sizeof(struct gfs2_dinode
));
459 mutex_unlock(&sdp
->sd_inum_mutex
);
466 mutex_unlock(&sdp
->sd_inum_mutex
);
472 static int pick_formal_ino_2(struct gfs2_sbd
*sdp
, u64
*formal_ino
)
474 struct gfs2_inode
*ip
= GFS2_I(sdp
->sd_ir_inode
);
475 struct gfs2_inode
*m_ip
= GFS2_I(sdp
->sd_inum_inode
);
476 struct gfs2_holder gh
;
477 struct buffer_head
*bh
;
478 struct gfs2_inum_range ir
;
481 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, 0, &gh
);
485 error
= gfs2_trans_begin(sdp
, 2 * RES_DINODE
, 0);
488 mutex_lock(&sdp
->sd_inum_mutex
);
490 error
= gfs2_meta_inode_buffer(ip
, &bh
);
494 gfs2_inum_range_in(&ir
, bh
->b_data
+ sizeof(struct gfs2_dinode
));
497 struct buffer_head
*m_bh
;
500 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
504 x
= *(u64
*)(m_bh
->b_data
+ sizeof(struct gfs2_dinode
));
505 x
= y
= be64_to_cpu(x
);
507 ir
.ir_length
= GFS2_INUM_QUANTUM
;
508 x
+= GFS2_INUM_QUANTUM
;
510 gfs2_consist_inode(m_ip
);
512 gfs2_trans_add_bh(m_ip
->i_gl
, m_bh
, 1);
513 *(u64
*)(m_bh
->b_data
+ sizeof(struct gfs2_dinode
)) = x
;
518 *formal_ino
= ir
.ir_start
++;
521 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
522 gfs2_inum_range_out(&ir
, bh
->b_data
+ sizeof(struct gfs2_dinode
));
527 mutex_unlock(&sdp
->sd_inum_mutex
);
530 gfs2_glock_dq_uninit(&gh
);
534 static int pick_formal_ino(struct gfs2_sbd
*sdp
, u64
*inum
)
538 error
= pick_formal_ino_1(sdp
, inum
);
542 error
= pick_formal_ino_2(sdp
, inum
);
548 * create_ok - OK to create a new on-disk inode here?
549 * @dip: Directory in which dinode is to be created
550 * @name: Name of new dinode
556 static int create_ok(struct gfs2_inode
*dip
, const struct qstr
*name
,
561 error
= permission(&dip
->i_inode
, MAY_WRITE
| MAY_EXEC
, NULL
);
565 /* Don't create entries in an unlinked directory */
566 if (!dip
->i_di
.di_nlink
)
569 error
= gfs2_dir_search(&dip
->i_inode
, name
, NULL
, NULL
);
580 if (dip
->i_di
.di_entries
== (u32
)-1)
582 if (S_ISDIR(mode
) && dip
->i_di
.di_nlink
== (u32
)-1)
588 static void munge_mode_uid_gid(struct gfs2_inode
*dip
, unsigned int *mode
,
589 unsigned int *uid
, unsigned int *gid
)
591 if (GFS2_SB(&dip
->i_inode
)->sd_args
.ar_suiddir
&&
592 (dip
->i_di
.di_mode
& S_ISUID
) && dip
->i_di
.di_uid
) {
595 else if (dip
->i_di
.di_uid
!= current
->fsuid
)
597 *uid
= dip
->i_di
.di_uid
;
599 *uid
= current
->fsuid
;
601 if (dip
->i_di
.di_mode
& S_ISGID
) {
604 *gid
= dip
->i_di
.di_gid
;
606 *gid
= current
->fsgid
;
609 static int alloc_dinode(struct gfs2_inode
*dip
, struct gfs2_inum
*inum
,
612 struct gfs2_sbd
*sdp
= GFS2_SB(&dip
->i_inode
);
617 dip
->i_alloc
.al_requested
= RES_DINODE
;
618 error
= gfs2_inplace_reserve(dip
);
622 error
= gfs2_trans_begin(sdp
, RES_RG_BIT
+ RES_STATFS
, 0);
626 inum
->no_addr
= gfs2_alloc_di(dip
, generation
);
631 gfs2_inplace_release(dip
);
638 * init_dinode - Fill in a new dinode structure
639 * @dip: the directory this inode is being created in
640 * @gl: The glock covering the new inode
641 * @inum: the inode number
642 * @mode: the file permissions
648 static void init_dinode(struct gfs2_inode
*dip
, struct gfs2_glock
*gl
,
649 const struct gfs2_inum
*inum
, unsigned int mode
,
650 unsigned int uid
, unsigned int gid
,
651 const u64
*generation
)
653 struct gfs2_sbd
*sdp
= GFS2_SB(&dip
->i_inode
);
654 struct gfs2_dinode
*di
;
655 struct buffer_head
*dibh
;
657 dibh
= gfs2_meta_new(gl
, inum
->no_addr
);
658 gfs2_trans_add_bh(gl
, dibh
, 1);
659 gfs2_metatype_set(dibh
, GFS2_METATYPE_DI
, GFS2_FORMAT_DI
);
660 gfs2_buffer_clear_tail(dibh
, sizeof(struct gfs2_dinode
));
661 di
= (struct gfs2_dinode
*)dibh
->b_data
;
663 di
->di_num
.no_formal_ino
= cpu_to_be64(inum
->no_formal_ino
);
664 di
->di_num
.no_addr
= cpu_to_be64(inum
->no_addr
);
665 di
->di_mode
= cpu_to_be32(mode
);
666 di
->di_uid
= cpu_to_be32(uid
);
667 di
->di_gid
= cpu_to_be32(gid
);
668 di
->di_nlink
= cpu_to_be32(0);
669 di
->di_size
= cpu_to_be64(0);
670 di
->di_blocks
= cpu_to_be64(1);
671 di
->di_atime
= di
->di_mtime
= di
->di_ctime
= cpu_to_be64(get_seconds());
672 di
->di_major
= di
->di_minor
= cpu_to_be32(0);
673 di
->di_goal_meta
= di
->di_goal_data
= cpu_to_be64(inum
->no_addr
);
674 di
->di_generation
= cpu_to_be64(*generation
);
675 di
->di_flags
= cpu_to_be32(0);
678 if ((dip
->i_di
.di_flags
& GFS2_DIF_INHERIT_JDATA
) ||
679 gfs2_tune_get(sdp
, gt_new_files_jdata
))
680 di
->di_flags
|= cpu_to_be32(GFS2_DIF_JDATA
);
681 if ((dip
->i_di
.di_flags
& GFS2_DIF_INHERIT_DIRECTIO
) ||
682 gfs2_tune_get(sdp
, gt_new_files_directio
))
683 di
->di_flags
|= cpu_to_be32(GFS2_DIF_DIRECTIO
);
684 } else if (S_ISDIR(mode
)) {
685 di
->di_flags
|= cpu_to_be32(dip
->i_di
.di_flags
&
686 GFS2_DIF_INHERIT_DIRECTIO
);
687 di
->di_flags
|= cpu_to_be32(dip
->i_di
.di_flags
&
688 GFS2_DIF_INHERIT_JDATA
);
692 di
->di_payload_format
= cpu_to_be32(0);
693 di
->di_height
= cpu_to_be32(0);
696 di
->di_depth
= cpu_to_be16(0);
697 di
->di_entries
= cpu_to_be32(0);
698 memset(&di
->__pad4
, 0, sizeof(di
->__pad4
));
699 di
->di_eattr
= cpu_to_be64(0);
700 memset(&di
->di_reserved
, 0, sizeof(di
->di_reserved
));
705 static int make_dinode(struct gfs2_inode
*dip
, struct gfs2_glock
*gl
,
706 unsigned int mode
, const struct gfs2_inum
*inum
,
707 const u64
*generation
)
709 struct gfs2_sbd
*sdp
= GFS2_SB(&dip
->i_inode
);
710 unsigned int uid
, gid
;
713 munge_mode_uid_gid(dip
, &mode
, &uid
, &gid
);
716 error
= gfs2_quota_lock(dip
, uid
, gid
);
720 error
= gfs2_quota_check(dip
, uid
, gid
);
724 error
= gfs2_trans_begin(sdp
, RES_DINODE
+ RES_QUOTA
, 0);
728 init_dinode(dip
, gl
, inum
, mode
, uid
, gid
, generation
);
729 gfs2_quota_change(dip
, +1, uid
, gid
);
733 gfs2_quota_unlock(dip
);
739 static int link_dinode(struct gfs2_inode
*dip
, const struct qstr
*name
,
740 struct gfs2_inode
*ip
)
742 struct gfs2_sbd
*sdp
= GFS2_SB(&dip
->i_inode
);
743 struct gfs2_alloc
*al
;
745 struct buffer_head
*dibh
;
748 al
= gfs2_alloc_get(dip
);
750 error
= gfs2_quota_lock(dip
, NO_QUOTA_CHANGE
, NO_QUOTA_CHANGE
);
754 error
= alloc_required
= gfs2_diradd_alloc_required(&dip
->i_inode
, name
);
755 if (alloc_required
< 0)
757 if (alloc_required
) {
758 error
= gfs2_quota_check(dip
, dip
->i_di
.di_uid
,
761 goto fail_quota_locks
;
763 al
->al_requested
= sdp
->sd_max_dirres
;
765 error
= gfs2_inplace_reserve(dip
);
767 goto fail_quota_locks
;
769 error
= gfs2_trans_begin(sdp
, sdp
->sd_max_dirres
+
770 al
->al_rgd
->rd_ri
.ri_length
+
772 RES_STATFS
+ RES_QUOTA
, 0);
776 error
= gfs2_trans_begin(sdp
, RES_LEAF
+ 2 * RES_DINODE
, 0);
778 goto fail_quota_locks
;
781 error
= gfs2_dir_add(&dip
->i_inode
, name
, &ip
->i_num
, IF2DT(ip
->i_di
.di_mode
));
785 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
788 ip
->i_di
.di_nlink
= 1;
789 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
790 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
798 if (dip
->i_alloc
.al_rgd
)
799 gfs2_inplace_release(dip
);
802 gfs2_quota_unlock(dip
);
810 * gfs2_createi - Create a new inode
811 * @ghs: An array of two holders
812 * @name: The name of the new file
813 * @mode: the permissions on the new inode
815 * @ghs[0] is an initialized holder for the directory
816 * @ghs[1] is the holder for the inode lock
818 * If the return value is not NULL, the glocks on both the directory and the new
819 * file are held. A transaction has been started and an inplace reservation
825 struct inode
*gfs2_createi(struct gfs2_holder
*ghs
, const struct qstr
*name
,
829 struct gfs2_inode
*dip
= ghs
->gh_gl
->gl_object
;
830 struct inode
*dir
= &dip
->i_inode
;
831 struct gfs2_sbd
*sdp
= GFS2_SB(&dip
->i_inode
);
832 struct gfs2_inum inum
;
836 if (!name
->len
|| name
->len
> GFS2_FNAMESIZE
)
837 return ERR_PTR(-ENAMETOOLONG
);
839 gfs2_holder_reinit(LM_ST_EXCLUSIVE
, 0, ghs
);
840 error
= gfs2_glock_nq(ghs
);
844 error
= create_ok(dip
, name
, mode
);
848 error
= pick_formal_ino(sdp
, &inum
.no_formal_ino
);
852 error
= alloc_dinode(dip
, &inum
, &generation
);
856 if (inum
.no_addr
< dip
->i_num
.no_addr
) {
859 error
= gfs2_glock_nq_num(sdp
, inum
.no_addr
,
860 &gfs2_inode_glops
, LM_ST_EXCLUSIVE
,
863 return ERR_PTR(error
);
866 gfs2_holder_reinit(LM_ST_EXCLUSIVE
, 0, ghs
);
867 error
= gfs2_glock_nq(ghs
);
869 gfs2_glock_dq_uninit(ghs
+ 1);
870 return ERR_PTR(error
);
873 error
= create_ok(dip
, name
, mode
);
877 error
= gfs2_glock_nq_num(sdp
, inum
.no_addr
,
878 &gfs2_inode_glops
, LM_ST_EXCLUSIVE
,
884 error
= make_dinode(dip
, ghs
[1].gh_gl
, mode
, &inum
, &generation
);
888 inode
= gfs2_inode_lookup(dir
->i_sb
, &inum
, IF2DT(mode
));
892 error
= gfs2_inode_refresh(GFS2_I(inode
));
896 error
= gfs2_acl_create(dip
, GFS2_I(inode
));
900 error
= link_dinode(dip
, name
, GFS2_I(inode
));
905 return ERR_PTR(-ENOMEM
);
911 gfs2_glock_dq_uninit(ghs
+ 1);
915 return ERR_PTR(error
);
919 * gfs2_rmdiri - Remove a directory
920 * @dip: The parent directory of the directory to be removed
921 * @name: The name of the directory to be removed
922 * @ip: The GFS2 inode of the directory to be removed
924 * Assumes Glocks on dip and ip are held
929 int gfs2_rmdiri(struct gfs2_inode
*dip
, const struct qstr
*name
,
930 struct gfs2_inode
*ip
)
935 if (ip
->i_di
.di_entries
!= 2) {
936 if (gfs2_consist_inode(ip
))
937 gfs2_dinode_print(&ip
->i_di
);
941 error
= gfs2_dir_del(dip
, name
);
945 error
= gfs2_change_nlink(dip
, -1);
949 gfs2_str2qstr(&dotname
, ".");
950 error
= gfs2_dir_del(ip
, &dotname
);
954 gfs2_str2qstr(&dotname
, "..");
955 error
= gfs2_dir_del(ip
, &dotname
);
959 error
= gfs2_change_nlink(ip
, -2);
967 * gfs2_unlink_ok - check to see that a inode is still in a directory
968 * @dip: the directory
969 * @name: the name of the file
972 * Assumes that the lock on (at least) @dip is held.
974 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
977 int gfs2_unlink_ok(struct gfs2_inode
*dip
, const struct qstr
*name
,
978 struct gfs2_inode
*ip
)
980 struct gfs2_inum inum
;
984 if (IS_IMMUTABLE(&ip
->i_inode
) || IS_APPEND(&ip
->i_inode
))
987 if ((dip
->i_di
.di_mode
& S_ISVTX
) &&
988 dip
->i_di
.di_uid
!= current
->fsuid
&&
989 ip
->i_di
.di_uid
!= current
->fsuid
&& !capable(CAP_FOWNER
))
992 if (IS_APPEND(&dip
->i_inode
))
995 error
= permission(&dip
->i_inode
, MAY_WRITE
| MAY_EXEC
, NULL
);
999 error
= gfs2_dir_search(&dip
->i_inode
, name
, &inum
, &type
);
1003 if (!gfs2_inum_equal(&inum
, &ip
->i_num
))
1006 if (IF2DT(ip
->i_di
.di_mode
) != type
) {
1007 gfs2_consist_inode(dip
);
1015 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1019 * Follow @to back to the root and make sure we don't encounter @this
1020 * Assumes we already hold the rename lock.
1025 int gfs2_ok_to_move(struct gfs2_inode
*this, struct gfs2_inode
*to
)
1027 struct inode
*dir
= &to
->i_inode
;
1028 struct super_block
*sb
= dir
->i_sb
;
1033 gfs2_str2qstr(&dotdot
, "..");
1038 if (dir
== &this->i_inode
) {
1042 if (dir
== sb
->s_root
->d_inode
) {
1047 tmp
= gfs2_lookupi(dir
, &dotdot
, 1, NULL
);
1049 error
= PTR_ERR(tmp
);
1063 * gfs2_readlinki - return the contents of a symlink
1064 * @ip: the symlink's inode
1065 * @buf: a pointer to the buffer to be filled
1066 * @len: a pointer to the length of @buf
1068 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1069 * to be freed by the caller.
1074 int gfs2_readlinki(struct gfs2_inode
*ip
, char **buf
, unsigned int *len
)
1076 struct gfs2_holder i_gh
;
1077 struct buffer_head
*dibh
;
1081 gfs2_holder_init(ip
->i_gl
, LM_ST_SHARED
, GL_ATIME
, &i_gh
);
1082 error
= gfs2_glock_nq_atime(&i_gh
);
1084 gfs2_holder_uninit(&i_gh
);
1088 if (!ip
->i_di
.di_size
) {
1089 gfs2_consist_inode(ip
);
1094 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
1098 x
= ip
->i_di
.di_size
+ 1;
1100 *buf
= kmalloc(x
, GFP_KERNEL
);
1107 memcpy(*buf
, dibh
->b_data
+ sizeof(struct gfs2_dinode
), x
);
1113 gfs2_glock_dq_uninit(&i_gh
);
1118 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1119 * conditionally update the inode's atime
1120 * @gh: the holder to acquire
1122 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1123 * Update if the difference between the current time and the inode's current
1124 * atime is greater than an interval specified at mount.
1129 int gfs2_glock_nq_atime(struct gfs2_holder
*gh
)
1131 struct gfs2_glock
*gl
= gh
->gh_gl
;
1132 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
1133 struct gfs2_inode
*ip
= gl
->gl_object
;
1134 s64 curtime
, quantum
= gfs2_tune_get(sdp
, gt_atime_quantum
);
1139 if (gfs2_assert_warn(sdp
, gh
->gh_flags
& GL_ATIME
) ||
1140 gfs2_assert_warn(sdp
, !(gh
->gh_flags
& GL_ASYNC
)) ||
1141 gfs2_assert_warn(sdp
, gl
->gl_ops
== &gfs2_inode_glops
))
1144 state
= gh
->gh_state
;
1145 flags
= gh
->gh_flags
;
1147 error
= gfs2_glock_nq(gh
);
1151 if (test_bit(SDF_NOATIME
, &sdp
->sd_flags
) ||
1152 (sdp
->sd_vfs
->s_flags
& MS_RDONLY
))
1155 curtime
= get_seconds();
1156 if (curtime
- ip
->i_di
.di_atime
>= quantum
) {
1158 gfs2_holder_reinit(LM_ST_EXCLUSIVE
, gh
->gh_flags
& ~LM_FLAG_ANY
,
1160 error
= gfs2_glock_nq(gh
);
1164 /* Verify that atime hasn't been updated while we were
1165 trying to get exclusive lock. */
1167 curtime
= get_seconds();
1168 if (curtime
- ip
->i_di
.di_atime
>= quantum
) {
1169 struct buffer_head
*dibh
;
1171 error
= gfs2_trans_begin(sdp
, RES_DINODE
, 0);
1172 if (error
== -EROFS
)
1177 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
1179 goto fail_end_trans
;
1181 ip
->i_di
.di_atime
= curtime
;
1183 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
1184 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
1187 gfs2_trans_end(sdp
);
1190 /* If someone else has asked for the glock,
1191 unlock and let them have it. Then reacquire
1192 in the original state. */
1193 if (gfs2_glock_is_blocking(gl
)) {
1195 gfs2_holder_reinit(state
, flags
, gh
);
1196 return gfs2_glock_nq(gh
);
1203 gfs2_trans_end(sdp
);
1210 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1211 * @arg_a: the first structure
1212 * @arg_b: the second structure
1214 * Returns: 1 if A > B
1219 static int glock_compare_atime(const void *arg_a
, const void *arg_b
)
1221 const struct gfs2_holder
*gh_a
= *(const struct gfs2_holder
**)arg_a
;
1222 const struct gfs2_holder
*gh_b
= *(const struct gfs2_holder
**)arg_b
;
1223 const struct lm_lockname
*a
= &gh_a
->gh_gl
->gl_name
;
1224 const struct lm_lockname
*b
= &gh_b
->gh_gl
->gl_name
;
1226 if (a
->ln_number
> b
->ln_number
)
1228 if (a
->ln_number
< b
->ln_number
)
1230 if (gh_a
->gh_state
== LM_ST_SHARED
&& gh_b
->gh_state
== LM_ST_EXCLUSIVE
)
1232 if (gh_a
->gh_state
== LM_ST_SHARED
&& (gh_b
->gh_flags
& GL_ATIME
))
1239 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1241 * @num_gh: the number of structures
1242 * @ghs: an array of struct gfs2_holder structures
1244 * Returns: 0 on success (all glocks acquired),
1245 * errno on failure (no glocks acquired)
1248 int gfs2_glock_nq_m_atime(unsigned int num_gh
, struct gfs2_holder
*ghs
)
1250 struct gfs2_holder
**p
;
1258 ghs
->gh_flags
&= ~(LM_FLAG_TRY
| GL_ASYNC
);
1259 if (ghs
->gh_flags
& GL_ATIME
)
1260 error
= gfs2_glock_nq_atime(ghs
);
1262 error
= gfs2_glock_nq(ghs
);
1266 p
= kcalloc(num_gh
, sizeof(struct gfs2_holder
*), GFP_KERNEL
);
1270 for (x
= 0; x
< num_gh
; x
++)
1273 sort(p
, num_gh
, sizeof(struct gfs2_holder
*), glock_compare_atime
,NULL
);
1275 for (x
= 0; x
< num_gh
; x
++) {
1276 p
[x
]->gh_flags
&= ~(LM_FLAG_TRY
| GL_ASYNC
);
1278 if (p
[x
]->gh_flags
& GL_ATIME
)
1279 error
= gfs2_glock_nq_atime(p
[x
]);
1281 error
= gfs2_glock_nq(p
[x
]);
1285 gfs2_glock_dq(p
[x
]);
1296 __gfs2_setattr_simple(struct gfs2_inode
*ip
, struct iattr
*attr
)
1298 struct buffer_head
*dibh
;
1301 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
1303 error
= inode_setattr(&ip
->i_inode
, attr
);
1304 gfs2_assert_warn(GFS2_SB(&ip
->i_inode
), !error
);
1305 gfs2_inode_attr_out(ip
);
1307 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
1308 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
1315 * gfs2_setattr_simple -
1319 * Called with a reference on the vnode.
1324 int gfs2_setattr_simple(struct gfs2_inode
*ip
, struct iattr
*attr
)
1328 if (current
->journal_info
)
1329 return __gfs2_setattr_simple(ip
, attr
);
1331 error
= gfs2_trans_begin(GFS2_SB(&ip
->i_inode
), RES_DINODE
, 0);
1335 error
= __gfs2_setattr_simple(ip
, attr
);
1336 gfs2_trans_end(GFS2_SB(&ip
->i_inode
));