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>
21 #include "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
)
391 struct super_block
*sb
= dir
->i_sb
;
392 struct gfs2_inode
*dip
= GFS2_I(dir
);
393 struct gfs2_holder d_gh
;
394 struct gfs2_inum inum
;
397 struct inode
*inode
= NULL
;
399 if (!name
->len
|| name
->len
> GFS2_FNAMESIZE
)
400 return ERR_PTR(-ENAMETOOLONG
);
402 if ((name
->len
== 1 && memcmp(name
->name
, ".", 1) == 0) ||
403 (name
->len
== 2 && memcmp(name
->name
, "..", 2) == 0 &&
404 dir
== sb
->s_root
->d_inode
)) {
409 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
, 0, &d_gh
);
411 return ERR_PTR(error
);
414 error
= permission(dir
, MAY_EXEC
, NULL
);
419 error
= gfs2_dir_search(dir
, name
, &inum
, &type
);
423 inode
= gfs2_inode_lookup(sb
, &inum
, type
);
426 gfs2_glock_dq_uninit(&d_gh
);
427 if (error
== -ENOENT
)
432 static int pick_formal_ino_1(struct gfs2_sbd
*sdp
, u64
*formal_ino
)
434 struct gfs2_inode
*ip
= GFS2_I(sdp
->sd_ir_inode
);
435 struct buffer_head
*bh
;
436 struct gfs2_inum_range ir
;
439 error
= gfs2_trans_begin(sdp
, RES_DINODE
, 0);
442 mutex_lock(&sdp
->sd_inum_mutex
);
444 error
= gfs2_meta_inode_buffer(ip
, &bh
);
446 mutex_unlock(&sdp
->sd_inum_mutex
);
451 gfs2_inum_range_in(&ir
, bh
->b_data
+ sizeof(struct gfs2_dinode
));
454 *formal_ino
= ir
.ir_start
++;
456 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
457 gfs2_inum_range_out(&ir
,
458 bh
->b_data
+ sizeof(struct gfs2_dinode
));
460 mutex_unlock(&sdp
->sd_inum_mutex
);
467 mutex_unlock(&sdp
->sd_inum_mutex
);
473 static int pick_formal_ino_2(struct gfs2_sbd
*sdp
, u64
*formal_ino
)
475 struct gfs2_inode
*ip
= GFS2_I(sdp
->sd_ir_inode
);
476 struct gfs2_inode
*m_ip
= GFS2_I(sdp
->sd_inum_inode
);
477 struct gfs2_holder gh
;
478 struct buffer_head
*bh
;
479 struct gfs2_inum_range ir
;
482 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, 0, &gh
);
486 error
= gfs2_trans_begin(sdp
, 2 * RES_DINODE
, 0);
489 mutex_lock(&sdp
->sd_inum_mutex
);
491 error
= gfs2_meta_inode_buffer(ip
, &bh
);
495 gfs2_inum_range_in(&ir
, bh
->b_data
+ sizeof(struct gfs2_dinode
));
498 struct buffer_head
*m_bh
;
501 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
505 x
= *(u64
*)(m_bh
->b_data
+ sizeof(struct gfs2_dinode
));
506 x
= y
= be64_to_cpu(x
);
508 ir
.ir_length
= GFS2_INUM_QUANTUM
;
509 x
+= GFS2_INUM_QUANTUM
;
511 gfs2_consist_inode(m_ip
);
513 gfs2_trans_add_bh(m_ip
->i_gl
, m_bh
, 1);
514 *(u64
*)(m_bh
->b_data
+ sizeof(struct gfs2_dinode
)) = x
;
519 *formal_ino
= ir
.ir_start
++;
522 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
523 gfs2_inum_range_out(&ir
, bh
->b_data
+ sizeof(struct gfs2_dinode
));
528 mutex_unlock(&sdp
->sd_inum_mutex
);
531 gfs2_glock_dq_uninit(&gh
);
535 static int pick_formal_ino(struct gfs2_sbd
*sdp
, u64
*inum
)
539 error
= pick_formal_ino_1(sdp
, inum
);
543 error
= pick_formal_ino_2(sdp
, inum
);
549 * create_ok - OK to create a new on-disk inode here?
550 * @dip: Directory in which dinode is to be created
551 * @name: Name of new dinode
557 static int create_ok(struct gfs2_inode
*dip
, const struct qstr
*name
,
562 error
= permission(&dip
->i_inode
, MAY_WRITE
| MAY_EXEC
, NULL
);
566 /* Don't create entries in an unlinked directory */
567 if (!dip
->i_di
.di_nlink
)
570 error
= gfs2_dir_search(&dip
->i_inode
, name
, NULL
, NULL
);
581 if (dip
->i_di
.di_entries
== (u32
)-1)
583 if (S_ISDIR(mode
) && dip
->i_di
.di_nlink
== (u32
)-1)
589 static void munge_mode_uid_gid(struct gfs2_inode
*dip
, unsigned int *mode
,
590 unsigned int *uid
, unsigned int *gid
)
592 if (GFS2_SB(&dip
->i_inode
)->sd_args
.ar_suiddir
&&
593 (dip
->i_di
.di_mode
& S_ISUID
) && dip
->i_di
.di_uid
) {
596 else if (dip
->i_di
.di_uid
!= current
->fsuid
)
598 *uid
= dip
->i_di
.di_uid
;
600 *uid
= current
->fsuid
;
602 if (dip
->i_di
.di_mode
& S_ISGID
) {
605 *gid
= dip
->i_di
.di_gid
;
607 *gid
= current
->fsgid
;
610 static int alloc_dinode(struct gfs2_inode
*dip
, struct gfs2_inum
*inum
,
613 struct gfs2_sbd
*sdp
= GFS2_SB(&dip
->i_inode
);
618 dip
->i_alloc
.al_requested
= RES_DINODE
;
619 error
= gfs2_inplace_reserve(dip
);
623 error
= gfs2_trans_begin(sdp
, RES_RG_BIT
+ RES_STATFS
, 0);
627 inum
->no_addr
= gfs2_alloc_di(dip
, generation
);
632 gfs2_inplace_release(dip
);
639 * init_dinode - Fill in a new dinode structure
640 * @dip: the directory this inode is being created in
641 * @gl: The glock covering the new inode
642 * @inum: the inode number
643 * @mode: the file permissions
649 static void init_dinode(struct gfs2_inode
*dip
, struct gfs2_glock
*gl
,
650 const struct gfs2_inum
*inum
, unsigned int mode
,
651 unsigned int uid
, unsigned int gid
,
652 const u64
*generation
)
654 struct gfs2_sbd
*sdp
= GFS2_SB(&dip
->i_inode
);
655 struct gfs2_dinode
*di
;
656 struct buffer_head
*dibh
;
658 dibh
= gfs2_meta_new(gl
, inum
->no_addr
);
659 gfs2_trans_add_bh(gl
, dibh
, 1);
660 gfs2_metatype_set(dibh
, GFS2_METATYPE_DI
, GFS2_FORMAT_DI
);
661 gfs2_buffer_clear_tail(dibh
, sizeof(struct gfs2_dinode
));
662 di
= (struct gfs2_dinode
*)dibh
->b_data
;
664 di
->di_num
.no_formal_ino
= cpu_to_be64(inum
->no_formal_ino
);
665 di
->di_num
.no_addr
= cpu_to_be64(inum
->no_addr
);
666 di
->di_mode
= cpu_to_be32(mode
);
667 di
->di_uid
= cpu_to_be32(uid
);
668 di
->di_gid
= cpu_to_be32(gid
);
669 di
->di_nlink
= cpu_to_be32(0);
670 di
->di_size
= cpu_to_be64(0);
671 di
->di_blocks
= cpu_to_be64(1);
672 di
->di_atime
= di
->di_mtime
= di
->di_ctime
= cpu_to_be64(get_seconds());
673 di
->di_major
= di
->di_minor
= cpu_to_be32(0);
674 di
->di_goal_meta
= di
->di_goal_data
= cpu_to_be64(inum
->no_addr
);
675 di
->di_generation
= cpu_to_be64(*generation
);
676 di
->di_flags
= cpu_to_be32(0);
679 if ((dip
->i_di
.di_flags
& GFS2_DIF_INHERIT_JDATA
) ||
680 gfs2_tune_get(sdp
, gt_new_files_jdata
))
681 di
->di_flags
|= cpu_to_be32(GFS2_DIF_JDATA
);
682 if ((dip
->i_di
.di_flags
& GFS2_DIF_INHERIT_DIRECTIO
) ||
683 gfs2_tune_get(sdp
, gt_new_files_directio
))
684 di
->di_flags
|= cpu_to_be32(GFS2_DIF_DIRECTIO
);
685 } else if (S_ISDIR(mode
)) {
686 di
->di_flags
|= cpu_to_be32(dip
->i_di
.di_flags
&
687 GFS2_DIF_INHERIT_DIRECTIO
);
688 di
->di_flags
|= cpu_to_be32(dip
->i_di
.di_flags
&
689 GFS2_DIF_INHERIT_JDATA
);
693 di
->di_payload_format
= cpu_to_be32(0);
694 di
->di_height
= cpu_to_be32(0);
697 di
->di_depth
= cpu_to_be16(0);
698 di
->di_entries
= cpu_to_be32(0);
699 memset(&di
->__pad4
, 0, sizeof(di
->__pad4
));
700 di
->di_eattr
= cpu_to_be64(0);
701 memset(&di
->di_reserved
, 0, sizeof(di
->di_reserved
));
706 static int make_dinode(struct gfs2_inode
*dip
, struct gfs2_glock
*gl
,
707 unsigned int mode
, const struct gfs2_inum
*inum
,
708 const u64
*generation
)
710 struct gfs2_sbd
*sdp
= GFS2_SB(&dip
->i_inode
);
711 unsigned int uid
, gid
;
714 munge_mode_uid_gid(dip
, &mode
, &uid
, &gid
);
717 error
= gfs2_quota_lock(dip
, uid
, gid
);
721 error
= gfs2_quota_check(dip
, uid
, gid
);
725 error
= gfs2_trans_begin(sdp
, RES_DINODE
+ RES_QUOTA
, 0);
729 init_dinode(dip
, gl
, inum
, mode
, uid
, gid
, generation
);
730 gfs2_quota_change(dip
, +1, uid
, gid
);
734 gfs2_quota_unlock(dip
);
740 static int link_dinode(struct gfs2_inode
*dip
, const struct qstr
*name
,
741 struct gfs2_inode
*ip
)
743 struct gfs2_sbd
*sdp
= GFS2_SB(&dip
->i_inode
);
744 struct gfs2_alloc
*al
;
746 struct buffer_head
*dibh
;
749 al
= gfs2_alloc_get(dip
);
751 error
= gfs2_quota_lock(dip
, NO_QUOTA_CHANGE
, NO_QUOTA_CHANGE
);
755 error
= alloc_required
= gfs2_diradd_alloc_required(&dip
->i_inode
, name
);
756 if (alloc_required
< 0)
758 if (alloc_required
) {
759 error
= gfs2_quota_check(dip
, dip
->i_di
.di_uid
,
762 goto fail_quota_locks
;
764 al
->al_requested
= sdp
->sd_max_dirres
;
766 error
= gfs2_inplace_reserve(dip
);
768 goto fail_quota_locks
;
770 error
= gfs2_trans_begin(sdp
, sdp
->sd_max_dirres
+
771 al
->al_rgd
->rd_ri
.ri_length
+
773 RES_STATFS
+ RES_QUOTA
, 0);
777 error
= gfs2_trans_begin(sdp
, RES_LEAF
+ 2 * RES_DINODE
, 0);
779 goto fail_quota_locks
;
782 error
= gfs2_dir_add(&dip
->i_inode
, name
, &ip
->i_num
, IF2DT(ip
->i_di
.di_mode
));
786 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
789 ip
->i_di
.di_nlink
= 1;
790 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
791 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
799 if (dip
->i_alloc
.al_rgd
)
800 gfs2_inplace_release(dip
);
803 gfs2_quota_unlock(dip
);
811 * gfs2_createi - Create a new inode
812 * @ghs: An array of two holders
813 * @name: The name of the new file
814 * @mode: the permissions on the new inode
816 * @ghs[0] is an initialized holder for the directory
817 * @ghs[1] is the holder for the inode lock
819 * If the return value is not NULL, the glocks on both the directory and the new
820 * file are held. A transaction has been started and an inplace reservation
826 struct inode
*gfs2_createi(struct gfs2_holder
*ghs
, const struct qstr
*name
,
830 struct gfs2_inode
*dip
= ghs
->gh_gl
->gl_object
;
831 struct inode
*dir
= &dip
->i_inode
;
832 struct gfs2_sbd
*sdp
= GFS2_SB(&dip
->i_inode
);
833 struct gfs2_inum inum
;
837 if (!name
->len
|| name
->len
> GFS2_FNAMESIZE
)
838 return ERR_PTR(-ENAMETOOLONG
);
840 gfs2_holder_reinit(LM_ST_EXCLUSIVE
, 0, ghs
);
841 error
= gfs2_glock_nq(ghs
);
845 error
= create_ok(dip
, name
, mode
);
849 error
= pick_formal_ino(sdp
, &inum
.no_formal_ino
);
853 error
= alloc_dinode(dip
, &inum
, &generation
);
857 if (inum
.no_addr
< dip
->i_num
.no_addr
) {
860 error
= gfs2_glock_nq_num(sdp
, inum
.no_addr
,
861 &gfs2_inode_glops
, LM_ST_EXCLUSIVE
,
864 return ERR_PTR(error
);
867 gfs2_holder_reinit(LM_ST_EXCLUSIVE
, 0, ghs
);
868 error
= gfs2_glock_nq(ghs
);
870 gfs2_glock_dq_uninit(ghs
+ 1);
871 return ERR_PTR(error
);
874 error
= create_ok(dip
, name
, mode
);
878 error
= gfs2_glock_nq_num(sdp
, inum
.no_addr
,
879 &gfs2_inode_glops
, LM_ST_EXCLUSIVE
,
885 error
= make_dinode(dip
, ghs
[1].gh_gl
, mode
, &inum
, &generation
);
889 inode
= gfs2_inode_lookup(dir
->i_sb
, &inum
, IF2DT(mode
));
893 error
= gfs2_inode_refresh(GFS2_I(inode
));
897 error
= gfs2_acl_create(dip
, GFS2_I(inode
));
901 error
= link_dinode(dip
, name
, GFS2_I(inode
));
906 return ERR_PTR(-ENOMEM
);
912 gfs2_glock_dq_uninit(ghs
+ 1);
916 return ERR_PTR(error
);
920 * gfs2_rmdiri - Remove a directory
921 * @dip: The parent directory of the directory to be removed
922 * @name: The name of the directory to be removed
923 * @ip: The GFS2 inode of the directory to be removed
925 * Assumes Glocks on dip and ip are held
930 int gfs2_rmdiri(struct gfs2_inode
*dip
, const struct qstr
*name
,
931 struct gfs2_inode
*ip
)
936 if (ip
->i_di
.di_entries
!= 2) {
937 if (gfs2_consist_inode(ip
))
938 gfs2_dinode_print(&ip
->i_di
);
942 error
= gfs2_dir_del(dip
, name
);
946 error
= gfs2_change_nlink(dip
, -1);
950 gfs2_str2qstr(&dotname
, ".");
951 error
= gfs2_dir_del(ip
, &dotname
);
955 gfs2_str2qstr(&dotname
, "..");
956 error
= gfs2_dir_del(ip
, &dotname
);
960 error
= gfs2_change_nlink(ip
, -2);
968 * gfs2_unlink_ok - check to see that a inode is still in a directory
969 * @dip: the directory
970 * @name: the name of the file
973 * Assumes that the lock on (at least) @dip is held.
975 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
978 int gfs2_unlink_ok(struct gfs2_inode
*dip
, const struct qstr
*name
,
979 struct gfs2_inode
*ip
)
981 struct gfs2_inum inum
;
985 if (IS_IMMUTABLE(&ip
->i_inode
) || IS_APPEND(&ip
->i_inode
))
988 if ((dip
->i_di
.di_mode
& S_ISVTX
) &&
989 dip
->i_di
.di_uid
!= current
->fsuid
&&
990 ip
->i_di
.di_uid
!= current
->fsuid
&& !capable(CAP_FOWNER
))
993 if (IS_APPEND(&dip
->i_inode
))
996 error
= permission(&dip
->i_inode
, MAY_WRITE
| MAY_EXEC
, NULL
);
1000 error
= gfs2_dir_search(&dip
->i_inode
, name
, &inum
, &type
);
1004 if (!gfs2_inum_equal(&inum
, &ip
->i_num
))
1007 if (IF2DT(ip
->i_di
.di_mode
) != type
) {
1008 gfs2_consist_inode(dip
);
1016 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1020 * Follow @to back to the root and make sure we don't encounter @this
1021 * Assumes we already hold the rename lock.
1026 int gfs2_ok_to_move(struct gfs2_inode
*this, struct gfs2_inode
*to
)
1028 struct inode
*dir
= &to
->i_inode
;
1029 struct super_block
*sb
= dir
->i_sb
;
1034 gfs2_str2qstr(&dotdot
, "..");
1039 if (dir
== &this->i_inode
) {
1043 if (dir
== sb
->s_root
->d_inode
) {
1048 tmp
= gfs2_lookupi(dir
, &dotdot
, 1, NULL
);
1050 error
= PTR_ERR(tmp
);
1064 * gfs2_readlinki - return the contents of a symlink
1065 * @ip: the symlink's inode
1066 * @buf: a pointer to the buffer to be filled
1067 * @len: a pointer to the length of @buf
1069 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1070 * to be freed by the caller.
1075 int gfs2_readlinki(struct gfs2_inode
*ip
, char **buf
, unsigned int *len
)
1077 struct gfs2_holder i_gh
;
1078 struct buffer_head
*dibh
;
1082 gfs2_holder_init(ip
->i_gl
, LM_ST_SHARED
, GL_ATIME
, &i_gh
);
1083 error
= gfs2_glock_nq_atime(&i_gh
);
1085 gfs2_holder_uninit(&i_gh
);
1089 if (!ip
->i_di
.di_size
) {
1090 gfs2_consist_inode(ip
);
1095 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
1099 x
= ip
->i_di
.di_size
+ 1;
1101 *buf
= kmalloc(x
, GFP_KERNEL
);
1108 memcpy(*buf
, dibh
->b_data
+ sizeof(struct gfs2_dinode
), x
);
1114 gfs2_glock_dq_uninit(&i_gh
);
1119 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1120 * conditionally update the inode's atime
1121 * @gh: the holder to acquire
1123 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1124 * Update if the difference between the current time and the inode's current
1125 * atime is greater than an interval specified at mount.
1130 int gfs2_glock_nq_atime(struct gfs2_holder
*gh
)
1132 struct gfs2_glock
*gl
= gh
->gh_gl
;
1133 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
1134 struct gfs2_inode
*ip
= gl
->gl_object
;
1135 s64 curtime
, quantum
= gfs2_tune_get(sdp
, gt_atime_quantum
);
1140 if (gfs2_assert_warn(sdp
, gh
->gh_flags
& GL_ATIME
) ||
1141 gfs2_assert_warn(sdp
, !(gh
->gh_flags
& GL_ASYNC
)) ||
1142 gfs2_assert_warn(sdp
, gl
->gl_ops
== &gfs2_inode_glops
))
1145 state
= gh
->gh_state
;
1146 flags
= gh
->gh_flags
;
1148 error
= gfs2_glock_nq(gh
);
1152 if (test_bit(SDF_NOATIME
, &sdp
->sd_flags
) ||
1153 (sdp
->sd_vfs
->s_flags
& MS_RDONLY
))
1156 curtime
= get_seconds();
1157 if (curtime
- ip
->i_di
.di_atime
>= quantum
) {
1159 gfs2_holder_reinit(LM_ST_EXCLUSIVE
, gh
->gh_flags
& ~LM_FLAG_ANY
,
1161 error
= gfs2_glock_nq(gh
);
1165 /* Verify that atime hasn't been updated while we were
1166 trying to get exclusive lock. */
1168 curtime
= get_seconds();
1169 if (curtime
- ip
->i_di
.di_atime
>= quantum
) {
1170 struct buffer_head
*dibh
;
1172 error
= gfs2_trans_begin(sdp
, RES_DINODE
, 0);
1173 if (error
== -EROFS
)
1178 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
1180 goto fail_end_trans
;
1182 ip
->i_di
.di_atime
= curtime
;
1184 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
1185 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
1188 gfs2_trans_end(sdp
);
1191 /* If someone else has asked for the glock,
1192 unlock and let them have it. Then reacquire
1193 in the original state. */
1194 if (gfs2_glock_is_blocking(gl
)) {
1196 gfs2_holder_reinit(state
, flags
, gh
);
1197 return gfs2_glock_nq(gh
);
1204 gfs2_trans_end(sdp
);
1211 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1212 * @arg_a: the first structure
1213 * @arg_b: the second structure
1215 * Returns: 1 if A > B
1220 static int glock_compare_atime(const void *arg_a
, const void *arg_b
)
1222 const struct gfs2_holder
*gh_a
= *(const struct gfs2_holder
**)arg_a
;
1223 const struct gfs2_holder
*gh_b
= *(const struct gfs2_holder
**)arg_b
;
1224 const struct lm_lockname
*a
= &gh_a
->gh_gl
->gl_name
;
1225 const struct lm_lockname
*b
= &gh_b
->gh_gl
->gl_name
;
1227 if (a
->ln_number
> b
->ln_number
)
1229 if (a
->ln_number
< b
->ln_number
)
1231 if (gh_a
->gh_state
== LM_ST_SHARED
&& gh_b
->gh_state
== LM_ST_EXCLUSIVE
)
1233 if (gh_a
->gh_state
== LM_ST_SHARED
&& (gh_b
->gh_flags
& GL_ATIME
))
1240 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1242 * @num_gh: the number of structures
1243 * @ghs: an array of struct gfs2_holder structures
1245 * Returns: 0 on success (all glocks acquired),
1246 * errno on failure (no glocks acquired)
1249 int gfs2_glock_nq_m_atime(unsigned int num_gh
, struct gfs2_holder
*ghs
)
1251 struct gfs2_holder
**p
;
1259 ghs
->gh_flags
&= ~(LM_FLAG_TRY
| GL_ASYNC
);
1260 if (ghs
->gh_flags
& GL_ATIME
)
1261 error
= gfs2_glock_nq_atime(ghs
);
1263 error
= gfs2_glock_nq(ghs
);
1267 p
= kcalloc(num_gh
, sizeof(struct gfs2_holder
*), GFP_KERNEL
);
1271 for (x
= 0; x
< num_gh
; x
++)
1274 sort(p
, num_gh
, sizeof(struct gfs2_holder
*), glock_compare_atime
,NULL
);
1276 for (x
= 0; x
< num_gh
; x
++) {
1277 p
[x
]->gh_flags
&= ~(LM_FLAG_TRY
| GL_ASYNC
);
1279 if (p
[x
]->gh_flags
& GL_ATIME
)
1280 error
= gfs2_glock_nq_atime(p
[x
]);
1282 error
= gfs2_glock_nq(p
[x
]);
1286 gfs2_glock_dq(p
[x
]);
1297 __gfs2_setattr_simple(struct gfs2_inode
*ip
, struct iattr
*attr
)
1299 struct buffer_head
*dibh
;
1302 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
1304 error
= inode_setattr(&ip
->i_inode
, attr
);
1305 gfs2_assert_warn(GFS2_SB(&ip
->i_inode
), !error
);
1306 gfs2_inode_attr_out(ip
);
1308 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
1309 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
1316 * gfs2_setattr_simple -
1320 * Called with a reference on the vnode.
1325 int gfs2_setattr_simple(struct gfs2_inode
*ip
, struct iattr
*attr
)
1329 if (current
->journal_info
)
1330 return __gfs2_setattr_simple(ip
, attr
);
1332 error
= gfs2_trans_begin(GFS2_SB(&ip
->i_inode
), RES_DINODE
, 0);
1336 error
= __gfs2_setattr_simple(ip
, attr
);
1337 gfs2_trans_end(GFS2_SB(&ip
->i_inode
));