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/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/xattr.h>
15 #include <linux/gfs2_ondisk.h>
16 #include <asm/uaccess.h>
31 * ea_calc_size - returns the acutal number of bytes the request will take up
32 * (not counting any unstuffed data blocks)
37 * Returns: 1 if the EA should be stuffed
40 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
43 unsigned int jbsize = sdp->sd_jbsize;
46 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
52 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
53 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
58 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
62 if (dsize > GFS2_EA_MAX_DATA_LEN)
65 ea_calc_size(sdp, nsize, dsize, &size);
67 /* This can only happen with 512 byte blocks */
68 if (size > sdp->sd_jbsize)
74 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
75 struct gfs2_ea_header *ea,
76 struct gfs2_ea_header *prev, void *private);
78 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
79 ea_call_t ea_call, void *data)
81 struct gfs2_ea_header *ea, *prev = NULL;
84 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
87 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
88 if (!GFS2_EA_REC_LEN(ea))
90 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
91 bh->b_data + bh->b_size))
93 if (!GFS2_EATYPE_VALID(ea->ea_type))
96 error = ea_call(ip, bh, ea, prev, data);
100 if (GFS2_EA_IS_LAST(ea)) {
101 if ((char *)GFS2_EA2NEXT(ea) !=
102 bh->b_data + bh->b_size)
111 gfs2_consist_inode(ip);
115 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
117 struct buffer_head *bh, *eabh;
121 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
125 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
126 error = ea_foreach_i(ip, bh, ea_call, data);
130 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
135 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
136 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
138 for (; eablk < end; eablk++) {
143 bn = be64_to_cpu(*eablk);
145 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
148 error = ea_foreach_i(ip, eabh, ea_call, data);
162 struct gfs2_ea_location *ef_el;
165 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
166 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
169 struct ea_find *ef = private;
171 if (ea->ea_type == GFS2_EATYPE_UNUSED)
174 if (ea->ea_type == ef->type) {
175 if (ea->ea_name_len == ef->namel &&
176 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
177 struct gfs2_ea_location *el = ef->ef_el;
189 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
190 struct gfs2_ea_location *el)
197 ef.namel = strlen(name);
200 memset(el, 0, sizeof(struct gfs2_ea_location));
202 error = ea_foreach(ip, ea_find_i, &ef);
210 * ea_dealloc_unstuffed -
217 * Take advantage of the fact that all unstuffed blocks are
218 * allocated from the same RG. But watch, this may not always
224 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
225 struct gfs2_ea_header *ea,
226 struct gfs2_ea_header *prev, void *private)
228 int *leave = private;
229 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
230 struct gfs2_rgrpd *rgd;
231 struct gfs2_holder rg_gh;
232 struct buffer_head *dibh;
236 unsigned int blen = 0;
237 unsigned int blks = 0;
241 if (GFS2_EA_IS_STUFFED(ea))
244 dataptrs = GFS2_EA2DATAPTRS(ea);
245 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
248 bn = be64_to_cpu(*dataptrs);
254 rgd = gfs2_blk2rgrpd(sdp, bn);
256 gfs2_consist_inode(ip);
260 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
264 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
265 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
269 gfs2_trans_add_bh(ip->i_gl, bh, 1);
271 dataptrs = GFS2_EA2DATAPTRS(ea);
272 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
275 bn = be64_to_cpu(*dataptrs);
277 if (bstart + blen == bn)
281 gfs2_free_meta(ip, bstart, blen);
287 gfs2_add_inode_blocks(&ip->i_inode, -1);
290 gfs2_free_meta(ip, bstart, blen);
292 if (prev && !leave) {
295 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
296 prev->ea_rec_len = cpu_to_be32(len);
298 if (GFS2_EA_IS_LAST(ea))
299 prev->ea_flags |= GFS2_EAFLAG_LAST;
301 ea->ea_type = GFS2_EATYPE_UNUSED;
305 error = gfs2_meta_inode_buffer(ip, &dibh);
307 ip->i_inode.i_ctime = CURRENT_TIME;
308 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
309 gfs2_dinode_out(ip, dibh->b_data);
316 gfs2_glock_dq_uninit(&rg_gh);
320 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
321 struct gfs2_ea_header *ea,
322 struct gfs2_ea_header *prev, int leave)
324 struct gfs2_alloc *al;
327 al = gfs2_alloc_get(ip);
331 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
335 error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
339 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
341 gfs2_glock_dq_uninit(&al->al_ri_gh);
344 gfs2_quota_unhold(ip);
351 struct gfs2_ea_request *ei_er;
352 unsigned int ei_size;
355 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
357 switch (ea->ea_type) {
358 case GFS2_EATYPE_USR:
359 return 5 + ea->ea_name_len + 1;
360 case GFS2_EATYPE_SYS:
361 return 7 + ea->ea_name_len + 1;
362 case GFS2_EATYPE_SECURITY:
363 return 9 + ea->ea_name_len + 1;
369 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
370 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
373 struct ea_list *ei = private;
374 struct gfs2_ea_request *er = ei->ei_er;
375 unsigned int ea_size = gfs2_ea_strlen(ea);
377 if (ea->ea_type == GFS2_EATYPE_UNUSED)
380 if (er->er_data_len) {
385 if (ei->ei_size + ea_size > er->er_data_len)
388 switch (ea->ea_type) {
389 case GFS2_EATYPE_USR:
393 case GFS2_EATYPE_SYS:
397 case GFS2_EATYPE_SECURITY:
398 prefix = "security.";
405 memcpy(er->er_data + ei->ei_size, prefix, l);
406 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
408 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
411 ei->ei_size += ea_size;
417 * gfs2_listxattr - List gfs2 extended attributes
418 * @dentry: The dentry whose inode we are interested in
419 * @buffer: The buffer to write the results
420 * @size: The size of the buffer
422 * Returns: actual size of data on success, -errno on error
425 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
427 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
428 struct gfs2_ea_request er;
429 struct gfs2_holder i_gh;
432 memset(&er, 0, sizeof(struct gfs2_ea_request));
435 er.er_data_len = size;
438 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
443 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
445 error = ea_foreach(ip, ea_list_i, &ei);
450 gfs2_glock_dq_uninit(&i_gh);
456 * ea_get_unstuffed - actually copies the unstuffed data into the
458 * @ip: The GFS2 inode
459 * @ea: The extended attribute header structure
460 * @data: The data to be copied
465 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
468 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
469 struct buffer_head **bh;
470 unsigned int amount = GFS2_EA_DATA_LEN(ea);
471 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
472 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
476 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
480 for (x = 0; x < nptrs; x++) {
481 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
491 for (x = 0; x < nptrs; x++) {
492 error = gfs2_meta_wait(sdp, bh[x]);
494 for (; x < nptrs; x++)
498 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
499 for (; x < nptrs; x++)
505 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
506 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
508 amount -= sdp->sd_jbsize;
509 data += sdp->sd_jbsize;
519 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
520 char *data, size_t size)
523 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
527 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
528 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
531 ret = ea_get_unstuffed(ip, el->el_ea, data);
537 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
539 struct gfs2_ea_location el;
544 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
549 if (!GFS2_EA_DATA_LEN(el.el_ea))
552 len = GFS2_EA_DATA_LEN(el.el_ea);
553 data = kmalloc(len, GFP_NOFS);
558 error = gfs2_ea_get_copy(ip, &el, data, len);
568 * gfs2_xattr_get - Get a GFS2 extended attribute
570 * @name: The name of the extended attribute
571 * @buffer: The buffer to write the result into
572 * @size: The size of the buffer
573 * @type: The type of extended attribute
575 * Returns: actual size of data on success, -errno on error
577 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
578 void *buffer, size_t size, int type)
580 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
581 struct gfs2_ea_location el;
586 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
589 error = gfs2_ea_find(ip, type, name, &el);
595 error = gfs2_ea_get_copy(ip, &el, buffer, size);
597 error = GFS2_EA_DATA_LEN(el.el_ea);
604 * ea_alloc_blk - allocates a new block for extended attributes.
605 * @ip: A pointer to the inode that's getting extended attributes
606 * @bhp: Pointer to pointer to a struct buffer_head
611 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
613 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
614 struct gfs2_ea_header *ea;
619 error = gfs2_alloc_block(ip, &block, &n);
622 gfs2_trans_add_unrevoke(sdp, block, 1);
623 *bhp = gfs2_meta_new(ip->i_gl, block);
624 gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
625 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
626 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
628 ea = GFS2_EA_BH2FIRST(*bhp);
629 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
630 ea->ea_type = GFS2_EATYPE_UNUSED;
631 ea->ea_flags = GFS2_EAFLAG_LAST;
634 gfs2_add_inode_blocks(&ip->i_inode, 1);
640 * ea_write - writes the request info to an ea, creating new blocks if
642 * @ip: inode that is being modified
643 * @ea: the location of the new ea in a block
644 * @er: the write request
646 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
651 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
652 struct gfs2_ea_request *er)
654 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
657 ea->ea_data_len = cpu_to_be32(er->er_data_len);
658 ea->ea_name_len = er->er_name_len;
659 ea->ea_type = er->er_type;
662 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
664 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
666 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
668 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
669 const char *data = er->er_data;
670 unsigned int data_len = er->er_data_len;
674 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
675 for (x = 0; x < ea->ea_num_ptrs; x++) {
676 struct buffer_head *bh;
678 int mh_size = sizeof(struct gfs2_meta_header);
681 error = gfs2_alloc_block(ip, &block, &n);
684 gfs2_trans_add_unrevoke(sdp, block, 1);
685 bh = gfs2_meta_new(ip->i_gl, block);
686 gfs2_trans_add_bh(ip->i_gl, bh, 1);
687 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
689 gfs2_add_inode_blocks(&ip->i_inode, 1);
691 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
693 memcpy(bh->b_data + mh_size, data, copy);
694 if (copy < sdp->sd_jbsize)
695 memset(bh->b_data + mh_size + copy, 0,
696 sdp->sd_jbsize - copy);
698 *dataptr++ = cpu_to_be64(bh->b_blocknr);
705 gfs2_assert_withdraw(sdp, !data_len);
711 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
712 struct gfs2_ea_request *er, void *private);
714 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
716 ea_skeleton_call_t skeleton_call, void *private)
718 struct gfs2_alloc *al;
719 struct buffer_head *dibh;
722 al = gfs2_alloc_get(ip);
726 error = gfs2_quota_lock_check(ip);
730 al->al_requested = blks;
732 error = gfs2_inplace_reserve(ip);
736 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
737 blks + gfs2_rg_blocks(al) +
738 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
742 error = skeleton_call(ip, er, private);
746 error = gfs2_meta_inode_buffer(ip, &dibh);
748 ip->i_inode.i_ctime = CURRENT_TIME;
749 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
750 gfs2_dinode_out(ip, dibh->b_data);
755 gfs2_trans_end(GFS2_SB(&ip->i_inode));
757 gfs2_inplace_release(ip);
759 gfs2_quota_unlock(ip);
765 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
768 struct buffer_head *bh;
771 error = ea_alloc_blk(ip, &bh);
775 ip->i_eattr = bh->b_blocknr;
776 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
784 * ea_init - initializes a new eattr block
791 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
792 const void *data, size_t size)
794 struct gfs2_ea_request er;
795 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
796 unsigned int blks = 1;
800 er.er_name_len = strlen(name);
801 er.er_data = (void *)data;
802 er.er_data_len = size;
804 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
805 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
807 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
810 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
812 u32 ea_size = GFS2_EA_SIZE(ea);
813 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
815 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
816 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
818 ea->ea_rec_len = cpu_to_be32(ea_size);
819 ea->ea_flags ^= last;
821 new->ea_rec_len = cpu_to_be32(new_size);
822 new->ea_flags = last;
827 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
828 struct gfs2_ea_location *el)
830 struct gfs2_ea_header *ea = el->el_ea;
831 struct gfs2_ea_header *prev = el->el_prev;
834 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
836 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
837 ea->ea_type = GFS2_EATYPE_UNUSED;
839 } else if (GFS2_EA2NEXT(prev) != ea) {
840 prev = GFS2_EA2NEXT(prev);
841 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
844 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
845 prev->ea_rec_len = cpu_to_be32(len);
847 if (GFS2_EA_IS_LAST(ea))
848 prev->ea_flags |= GFS2_EAFLAG_LAST;
854 struct gfs2_ea_request *es_er;
855 struct gfs2_ea_location *es_el;
857 struct buffer_head *es_bh;
858 struct gfs2_ea_header *es_ea;
861 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
862 struct gfs2_ea_header *ea, struct ea_set *es)
864 struct gfs2_ea_request *er = es->es_er;
865 struct buffer_head *dibh;
868 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
872 gfs2_trans_add_bh(ip->i_gl, bh, 1);
875 ea = ea_split_ea(ea);
877 ea_write(ip, ea, er);
880 ea_set_remove_stuffed(ip, es->es_el);
882 error = gfs2_meta_inode_buffer(ip, &dibh);
885 ip->i_inode.i_ctime = CURRENT_TIME;
886 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
887 gfs2_dinode_out(ip, dibh->b_data);
890 gfs2_trans_end(GFS2_SB(&ip->i_inode));
894 static int ea_set_simple_alloc(struct gfs2_inode *ip,
895 struct gfs2_ea_request *er, void *private)
897 struct ea_set *es = private;
898 struct gfs2_ea_header *ea = es->es_ea;
901 gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
904 ea = ea_split_ea(ea);
906 error = ea_write(ip, ea, er);
911 ea_set_remove_stuffed(ip, es->es_el);
916 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
917 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
920 struct ea_set *es = private;
925 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
926 es->es_er->er_data_len, &size);
928 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
929 if (GFS2_EA_REC_LEN(ea) < size)
931 if (!GFS2_EA_IS_STUFFED(ea)) {
932 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
937 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
943 error = ea_set_simple_noalloc(ip, bh, ea, es);
951 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
952 GFS2_SB(&ip->i_inode)->sd_jbsize);
954 error = ea_alloc_skeleton(ip, es->es_er, blks,
955 ea_set_simple_alloc, es);
963 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
966 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
967 struct buffer_head *indbh, *newbh;
970 int mh_size = sizeof(struct gfs2_meta_header);
972 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
975 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
980 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
985 eablk = (__be64 *)(indbh->b_data + mh_size);
986 end = eablk + sdp->sd_inptrs;
988 for (; eablk < end; eablk++)
997 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1001 error = gfs2_alloc_block(ip, &blk, &n);
1004 gfs2_trans_add_unrevoke(sdp, blk, 1);
1005 indbh = gfs2_meta_new(ip->i_gl, blk);
1006 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1007 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1008 gfs2_buffer_clear_tail(indbh, mh_size);
1010 eablk = (__be64 *)(indbh->b_data + mh_size);
1011 *eablk = cpu_to_be64(ip->i_eattr);
1013 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1014 gfs2_add_inode_blocks(&ip->i_inode, 1);
1019 error = ea_alloc_blk(ip, &newbh);
1023 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1024 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1030 ea_set_remove_stuffed(ip, private);
1037 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1038 const void *value, size_t size, struct gfs2_ea_location *el)
1040 struct gfs2_ea_request er;
1042 unsigned int blks = 2;
1047 er.er_data = (void *)value;
1048 er.er_name_len = strlen(name);
1049 er.er_data_len = size;
1051 memset(&es, 0, sizeof(struct ea_set));
1055 error = ea_foreach(ip, ea_set_simple, &es);
1061 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1063 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1064 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1066 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1069 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1070 struct gfs2_ea_location *el)
1072 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1073 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1074 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1075 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1078 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1081 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1083 struct gfs2_ea_header *ea = el->el_ea;
1084 struct gfs2_ea_header *prev = el->el_prev;
1085 struct buffer_head *dibh;
1088 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1092 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1097 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1098 prev->ea_rec_len = cpu_to_be32(len);
1100 if (GFS2_EA_IS_LAST(ea))
1101 prev->ea_flags |= GFS2_EAFLAG_LAST;
1103 ea->ea_type = GFS2_EATYPE_UNUSED;
1106 error = gfs2_meta_inode_buffer(ip, &dibh);
1108 ip->i_inode.i_ctime = CURRENT_TIME;
1109 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1110 gfs2_dinode_out(ip, dibh->b_data);
1114 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1120 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1122 * @type: The type of the extended attribute
1123 * @name: The name of the extended attribute
1125 * This is not called directly by the VFS since we use the (common)
1126 * scheme of making a "set with NULL data" mean a remove request. Note
1127 * that this is different from a set with zero length data.
1129 * Returns: 0, or errno on failure
1132 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1134 struct gfs2_ea_location el;
1140 error = gfs2_ea_find(ip, type, name, &el);
1146 if (GFS2_EA_IS_STUFFED(el.el_ea))
1147 error = ea_remove_stuffed(ip, &el);
1149 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1157 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1159 * @name: The name of the extended attribute
1160 * @value: The value of the extended attribute (NULL for remove)
1161 * @size: The size of the @value argument
1162 * @flags: Create or Replace
1163 * @type: The type of the extended attribute
1165 * See gfs2_xattr_remove() for details of the removal of xattrs.
1167 * Returns: 0 or errno on failure
1170 int __gfs2_xattr_set(struct inode *inode, const char *name,
1171 const void *value, size_t size, int flags, int type)
1173 struct gfs2_inode *ip = GFS2_I(inode);
1174 struct gfs2_sbd *sdp = GFS2_SB(inode);
1175 struct gfs2_ea_location el;
1176 unsigned int namel = strlen(name);
1179 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1181 if (namel > GFS2_EA_MAX_NAME_LEN)
1185 return gfs2_xattr_remove(ip, type, name);
1187 if (ea_check_size(sdp, namel, size))
1191 if (flags & XATTR_REPLACE)
1193 return ea_init(ip, type, name, value, size);
1196 error = gfs2_ea_find(ip, type, name, &el);
1201 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1207 if (!(flags & XATTR_CREATE)) {
1208 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1209 error = ea_set_i(ip, type, name, value, size, &el);
1210 if (!error && unstuffed)
1211 ea_set_remove_unstuffed(ip, &el);
1219 if (!(flags & XATTR_REPLACE))
1220 error = ea_set_i(ip, type, name, value, size, NULL);
1225 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1226 const void *value, size_t size, int flags, int type)
1228 return __gfs2_xattr_set(dentry->d_inode, name, value,
1232 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1233 struct gfs2_ea_header *ea, char *data)
1235 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1236 struct buffer_head **bh;
1237 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1238 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1239 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1243 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1247 error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1251 for (x = 0; x < nptrs; x++) {
1252 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1262 for (x = 0; x < nptrs; x++) {
1263 error = gfs2_meta_wait(sdp, bh[x]);
1265 for (; x < nptrs; x++)
1269 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1270 for (; x < nptrs; x++)
1276 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1278 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1279 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1281 amount -= sdp->sd_jbsize;
1282 data += sdp->sd_jbsize;
1292 gfs2_trans_end(sdp);
1297 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1299 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1300 struct gfs2_ea_location el;
1303 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1307 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1308 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1310 gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1311 memcpy(GFS2_EA2DATA(el.el_ea), data,
1312 GFS2_EA_DATA_LEN(el.el_ea));
1315 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1322 error = gfs2_setattr_simple(ip, attr);
1323 gfs2_trans_end(sdp);
1327 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1329 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1330 struct gfs2_rgrp_list rlist;
1331 struct buffer_head *indbh, *dibh;
1332 __be64 *eablk, *end;
1333 unsigned int rg_blocks = 0;
1335 unsigned int blen = 0;
1336 unsigned int blks = 0;
1340 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1342 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1346 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1351 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1352 end = eablk + sdp->sd_inptrs;
1354 for (; eablk < end; eablk++) {
1359 bn = be64_to_cpu(*eablk);
1361 if (bstart + blen == bn)
1365 gfs2_rlist_add(sdp, &rlist, bstart);
1372 gfs2_rlist_add(sdp, &rlist, bstart);
1376 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1378 for (x = 0; x < rlist.rl_rgrps; x++) {
1379 struct gfs2_rgrpd *rgd;
1380 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1381 rg_blocks += rgd->rd_length;
1384 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1386 goto out_rlist_free;
1388 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1389 RES_STATFS + RES_QUOTA, blks);
1393 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1395 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1399 for (; eablk < end; eablk++) {
1404 bn = be64_to_cpu(*eablk);
1406 if (bstart + blen == bn)
1410 gfs2_free_meta(ip, bstart, blen);
1416 gfs2_add_inode_blocks(&ip->i_inode, -1);
1419 gfs2_free_meta(ip, bstart, blen);
1421 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1423 error = gfs2_meta_inode_buffer(ip, &dibh);
1425 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1426 gfs2_dinode_out(ip, dibh->b_data);
1430 gfs2_trans_end(sdp);
1433 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1435 gfs2_rlist_free(&rlist);
1441 static int ea_dealloc_block(struct gfs2_inode *ip)
1443 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1444 struct gfs2_alloc *al = ip->i_alloc;
1445 struct gfs2_rgrpd *rgd;
1446 struct buffer_head *dibh;
1449 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1451 gfs2_consist_inode(ip);
1455 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1460 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1465 gfs2_free_meta(ip, ip->i_eattr, 1);
1468 gfs2_add_inode_blocks(&ip->i_inode, -1);
1470 error = gfs2_meta_inode_buffer(ip, &dibh);
1472 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1473 gfs2_dinode_out(ip, dibh->b_data);
1477 gfs2_trans_end(sdp);
1480 gfs2_glock_dq_uninit(&al->al_rgd_gh);
1485 * gfs2_ea_dealloc - deallocate the extended attribute fork
1491 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1493 struct gfs2_alloc *al;
1496 al = gfs2_alloc_get(ip);
1500 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1504 error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1508 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1512 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1513 error = ea_dealloc_indirect(ip);
1518 error = ea_dealloc_block(ip);
1521 gfs2_glock_dq_uninit(&al->al_ri_gh);
1523 gfs2_quota_unhold(ip);
1529 static const struct xattr_handler gfs2_xattr_user_handler = {
1530 .prefix = XATTR_USER_PREFIX,
1531 .flags = GFS2_EATYPE_USR,
1532 .get = gfs2_xattr_get,
1533 .set = gfs2_xattr_set,
1536 static const struct xattr_handler gfs2_xattr_security_handler = {
1537 .prefix = XATTR_SECURITY_PREFIX,
1538 .flags = GFS2_EATYPE_SECURITY,
1539 .get = gfs2_xattr_get,
1540 .set = gfs2_xattr_set,
1543 const struct xattr_handler *gfs2_xattr_handlers[] = {
1544 &gfs2_xattr_user_handler,
1545 &gfs2_xattr_security_handler,
1546 &gfs2_xattr_system_handler,