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 error = gfs2_rindex_update(sdp);
245 if (GFS2_EA_IS_STUFFED(ea))
248 dataptrs = GFS2_EA2DATAPTRS(ea);
249 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
252 bn = be64_to_cpu(*dataptrs);
258 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
260 gfs2_consist_inode(ip);
264 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
268 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
269 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
273 gfs2_trans_add_meta(ip->i_gl, bh);
275 dataptrs = GFS2_EA2DATAPTRS(ea);
276 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
279 bn = be64_to_cpu(*dataptrs);
281 if (bstart + blen == bn)
285 gfs2_free_meta(ip, bstart, blen);
291 gfs2_add_inode_blocks(&ip->i_inode, -1);
294 gfs2_free_meta(ip, bstart, blen);
296 if (prev && !leave) {
299 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
300 prev->ea_rec_len = cpu_to_be32(len);
302 if (GFS2_EA_IS_LAST(ea))
303 prev->ea_flags |= GFS2_EAFLAG_LAST;
305 ea->ea_type = GFS2_EATYPE_UNUSED;
309 error = gfs2_meta_inode_buffer(ip, &dibh);
311 ip->i_inode.i_ctime = CURRENT_TIME;
312 gfs2_trans_add_meta(ip->i_gl, dibh);
313 gfs2_dinode_out(ip, dibh->b_data);
320 gfs2_glock_dq_uninit(&rg_gh);
324 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
325 struct gfs2_ea_header *ea,
326 struct gfs2_ea_header *prev, int leave)
330 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
334 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
338 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
340 gfs2_quota_unhold(ip);
346 struct gfs2_ea_request *ei_er;
347 unsigned int ei_size;
350 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
352 switch (ea->ea_type) {
353 case GFS2_EATYPE_USR:
354 return 5 + ea->ea_name_len + 1;
355 case GFS2_EATYPE_SYS:
356 return 7 + ea->ea_name_len + 1;
357 case GFS2_EATYPE_SECURITY:
358 return 9 + ea->ea_name_len + 1;
364 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
365 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
368 struct ea_list *ei = private;
369 struct gfs2_ea_request *er = ei->ei_er;
370 unsigned int ea_size = gfs2_ea_strlen(ea);
372 if (ea->ea_type == GFS2_EATYPE_UNUSED)
375 if (er->er_data_len) {
380 if (ei->ei_size + ea_size > er->er_data_len)
383 switch (ea->ea_type) {
384 case GFS2_EATYPE_USR:
388 case GFS2_EATYPE_SYS:
392 case GFS2_EATYPE_SECURITY:
393 prefix = "security.";
400 memcpy(er->er_data + ei->ei_size, prefix, l);
401 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
403 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
406 ei->ei_size += ea_size;
412 * gfs2_listxattr - List gfs2 extended attributes
413 * @dentry: The dentry whose inode we are interested in
414 * @buffer: The buffer to write the results
415 * @size: The size of the buffer
417 * Returns: actual size of data on success, -errno on error
420 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
422 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
423 struct gfs2_ea_request er;
424 struct gfs2_holder i_gh;
427 memset(&er, 0, sizeof(struct gfs2_ea_request));
430 er.er_data_len = size;
433 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
438 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
440 error = ea_foreach(ip, ea_list_i, &ei);
445 gfs2_glock_dq_uninit(&i_gh);
451 * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
453 * @ip: The GFS2 inode
454 * @ea: The extended attribute header structure
455 * @din: The data to be copied in
456 * @dout: The data to be copied out (one of din,dout will be NULL)
461 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
462 const char *din, char *dout)
464 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
465 struct buffer_head **bh;
466 unsigned int amount = GFS2_EA_DATA_LEN(ea);
467 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
468 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
474 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
478 for (x = 0; x < nptrs; x++) {
479 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
489 for (x = 0; x < nptrs; x++) {
490 error = gfs2_meta_wait(sdp, bh[x]);
492 for (; x < nptrs; x++)
496 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
497 for (; x < nptrs; x++)
503 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
504 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
507 memcpy(dout, pos, cp_size);
508 dout += sdp->sd_jbsize;
512 gfs2_trans_add_meta(ip->i_gl, bh[x]);
513 memcpy(pos, din, cp_size);
514 din += sdp->sd_jbsize;
517 amount -= sdp->sd_jbsize;
526 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
527 char *data, size_t size)
530 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
534 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
535 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
538 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
544 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
546 struct gfs2_ea_location el;
551 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
556 if (!GFS2_EA_DATA_LEN(el.el_ea))
559 len = GFS2_EA_DATA_LEN(el.el_ea);
560 data = kmalloc(len, GFP_NOFS);
565 error = gfs2_ea_get_copy(ip, &el, data, len);
576 * gfs2_xattr_get - Get a GFS2 extended attribute
578 * @name: The name of the extended attribute
579 * @buffer: The buffer to write the result into
580 * @size: The size of the buffer
581 * @type: The type of extended attribute
583 * Returns: actual size of data on success, -errno on error
585 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
586 void *buffer, size_t size, int type)
588 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
589 struct gfs2_ea_location el;
594 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
597 error = gfs2_ea_find(ip, type, name, &el);
603 error = gfs2_ea_get_copy(ip, &el, buffer, size);
605 error = GFS2_EA_DATA_LEN(el.el_ea);
612 * ea_alloc_blk - allocates a new block for extended attributes.
613 * @ip: A pointer to the inode that's getting extended attributes
614 * @bhp: Pointer to pointer to a struct buffer_head
619 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
621 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
622 struct gfs2_ea_header *ea;
627 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
630 gfs2_trans_add_unrevoke(sdp, block, 1);
631 *bhp = gfs2_meta_new(ip->i_gl, block);
632 gfs2_trans_add_meta(ip->i_gl, *bhp);
633 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
634 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
636 ea = GFS2_EA_BH2FIRST(*bhp);
637 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
638 ea->ea_type = GFS2_EATYPE_UNUSED;
639 ea->ea_flags = GFS2_EAFLAG_LAST;
642 gfs2_add_inode_blocks(&ip->i_inode, 1);
648 * ea_write - writes the request info to an ea, creating new blocks if
650 * @ip: inode that is being modified
651 * @ea: the location of the new ea in a block
652 * @er: the write request
654 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
659 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
660 struct gfs2_ea_request *er)
662 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
665 ea->ea_data_len = cpu_to_be32(er->er_data_len);
666 ea->ea_name_len = er->er_name_len;
667 ea->ea_type = er->er_type;
670 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
672 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
674 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
676 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
677 const char *data = er->er_data;
678 unsigned int data_len = er->er_data_len;
682 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
683 for (x = 0; x < ea->ea_num_ptrs; x++) {
684 struct buffer_head *bh;
686 int mh_size = sizeof(struct gfs2_meta_header);
689 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
692 gfs2_trans_add_unrevoke(sdp, block, 1);
693 bh = gfs2_meta_new(ip->i_gl, block);
694 gfs2_trans_add_meta(ip->i_gl, bh);
695 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
697 gfs2_add_inode_blocks(&ip->i_inode, 1);
699 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
701 memcpy(bh->b_data + mh_size, data, copy);
702 if (copy < sdp->sd_jbsize)
703 memset(bh->b_data + mh_size + copy, 0,
704 sdp->sd_jbsize - copy);
706 *dataptr++ = cpu_to_be64(bh->b_blocknr);
713 gfs2_assert_withdraw(sdp, !data_len);
719 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
720 struct gfs2_ea_request *er, void *private);
722 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
724 ea_skeleton_call_t skeleton_call, void *private)
726 struct gfs2_alloc_parms ap = { .target = blks };
727 struct buffer_head *dibh;
730 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
734 error = gfs2_quota_lock_check(ip);
738 error = gfs2_inplace_reserve(ip, &ap);
742 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
743 blks + gfs2_rg_blocks(ip, blks) +
744 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
748 error = skeleton_call(ip, er, private);
752 error = gfs2_meta_inode_buffer(ip, &dibh);
754 ip->i_inode.i_ctime = CURRENT_TIME;
755 gfs2_trans_add_meta(ip->i_gl, dibh);
756 gfs2_dinode_out(ip, dibh->b_data);
761 gfs2_trans_end(GFS2_SB(&ip->i_inode));
763 gfs2_inplace_release(ip);
765 gfs2_quota_unlock(ip);
769 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
772 struct buffer_head *bh;
775 error = ea_alloc_blk(ip, &bh);
779 ip->i_eattr = bh->b_blocknr;
780 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
788 * ea_init - initializes a new eattr block
795 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
796 const void *data, size_t size)
798 struct gfs2_ea_request er;
799 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
800 unsigned int blks = 1;
804 er.er_name_len = strlen(name);
805 er.er_data = (void *)data;
806 er.er_data_len = size;
808 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
809 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
811 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
814 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
816 u32 ea_size = GFS2_EA_SIZE(ea);
817 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
819 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
820 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
822 ea->ea_rec_len = cpu_to_be32(ea_size);
823 ea->ea_flags ^= last;
825 new->ea_rec_len = cpu_to_be32(new_size);
826 new->ea_flags = last;
831 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
832 struct gfs2_ea_location *el)
834 struct gfs2_ea_header *ea = el->el_ea;
835 struct gfs2_ea_header *prev = el->el_prev;
838 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
840 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
841 ea->ea_type = GFS2_EATYPE_UNUSED;
843 } else if (GFS2_EA2NEXT(prev) != ea) {
844 prev = GFS2_EA2NEXT(prev);
845 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
848 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
849 prev->ea_rec_len = cpu_to_be32(len);
851 if (GFS2_EA_IS_LAST(ea))
852 prev->ea_flags |= GFS2_EAFLAG_LAST;
858 struct gfs2_ea_request *es_er;
859 struct gfs2_ea_location *es_el;
861 struct buffer_head *es_bh;
862 struct gfs2_ea_header *es_ea;
865 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
866 struct gfs2_ea_header *ea, struct ea_set *es)
868 struct gfs2_ea_request *er = es->es_er;
869 struct buffer_head *dibh;
872 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
876 gfs2_trans_add_meta(ip->i_gl, bh);
879 ea = ea_split_ea(ea);
881 ea_write(ip, ea, er);
884 ea_set_remove_stuffed(ip, es->es_el);
886 error = gfs2_meta_inode_buffer(ip, &dibh);
889 ip->i_inode.i_ctime = CURRENT_TIME;
890 gfs2_trans_add_meta(ip->i_gl, dibh);
891 gfs2_dinode_out(ip, dibh->b_data);
894 gfs2_trans_end(GFS2_SB(&ip->i_inode));
898 static int ea_set_simple_alloc(struct gfs2_inode *ip,
899 struct gfs2_ea_request *er, void *private)
901 struct ea_set *es = private;
902 struct gfs2_ea_header *ea = es->es_ea;
905 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
908 ea = ea_split_ea(ea);
910 error = ea_write(ip, ea, er);
915 ea_set_remove_stuffed(ip, es->es_el);
920 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
921 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
924 struct ea_set *es = private;
929 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
930 es->es_er->er_data_len, &size);
932 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
933 if (GFS2_EA_REC_LEN(ea) < size)
935 if (!GFS2_EA_IS_STUFFED(ea)) {
936 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
941 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
947 error = ea_set_simple_noalloc(ip, bh, ea, es);
955 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
956 GFS2_SB(&ip->i_inode)->sd_jbsize);
958 error = ea_alloc_skeleton(ip, es->es_er, blks,
959 ea_set_simple_alloc, es);
967 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
970 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
971 struct buffer_head *indbh, *newbh;
974 int mh_size = sizeof(struct gfs2_meta_header);
976 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
979 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
984 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
989 eablk = (__be64 *)(indbh->b_data + mh_size);
990 end = eablk + sdp->sd_inptrs;
992 for (; eablk < end; eablk++)
1001 gfs2_trans_add_meta(ip->i_gl, indbh);
1005 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1008 gfs2_trans_add_unrevoke(sdp, blk, 1);
1009 indbh = gfs2_meta_new(ip->i_gl, blk);
1010 gfs2_trans_add_meta(ip->i_gl, indbh);
1011 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1012 gfs2_buffer_clear_tail(indbh, mh_size);
1014 eablk = (__be64 *)(indbh->b_data + mh_size);
1015 *eablk = cpu_to_be64(ip->i_eattr);
1017 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1018 gfs2_add_inode_blocks(&ip->i_inode, 1);
1023 error = ea_alloc_blk(ip, &newbh);
1027 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1028 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1034 ea_set_remove_stuffed(ip, private);
1041 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1042 const void *value, size_t size, struct gfs2_ea_location *el)
1044 struct gfs2_ea_request er;
1046 unsigned int blks = 2;
1051 er.er_data = (void *)value;
1052 er.er_name_len = strlen(name);
1053 er.er_data_len = size;
1055 memset(&es, 0, sizeof(struct ea_set));
1059 error = ea_foreach(ip, ea_set_simple, &es);
1065 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1067 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1068 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1070 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1073 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1074 struct gfs2_ea_location *el)
1076 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1077 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1078 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1079 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1082 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1085 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1087 struct gfs2_ea_header *ea = el->el_ea;
1088 struct gfs2_ea_header *prev = el->el_prev;
1089 struct buffer_head *dibh;
1092 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1096 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1101 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1102 prev->ea_rec_len = cpu_to_be32(len);
1104 if (GFS2_EA_IS_LAST(ea))
1105 prev->ea_flags |= GFS2_EAFLAG_LAST;
1107 ea->ea_type = GFS2_EATYPE_UNUSED;
1110 error = gfs2_meta_inode_buffer(ip, &dibh);
1112 ip->i_inode.i_ctime = CURRENT_TIME;
1113 gfs2_trans_add_meta(ip->i_gl, dibh);
1114 gfs2_dinode_out(ip, dibh->b_data);
1118 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1124 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1126 * @type: The type of the extended attribute
1127 * @name: The name of the extended attribute
1129 * This is not called directly by the VFS since we use the (common)
1130 * scheme of making a "set with NULL data" mean a remove request. Note
1131 * that this is different from a set with zero length data.
1133 * Returns: 0, or errno on failure
1136 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1138 struct gfs2_ea_location el;
1144 error = gfs2_ea_find(ip, type, name, &el);
1150 if (GFS2_EA_IS_STUFFED(el.el_ea))
1151 error = ea_remove_stuffed(ip, &el);
1153 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1161 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1163 * @name: The name of the extended attribute
1164 * @value: The value of the extended attribute (NULL for remove)
1165 * @size: The size of the @value argument
1166 * @flags: Create or Replace
1167 * @type: The type of the extended attribute
1169 * See gfs2_xattr_remove() for details of the removal of xattrs.
1171 * Returns: 0 or errno on failure
1174 int __gfs2_xattr_set(struct inode *inode, const char *name,
1175 const void *value, size_t size, int flags, int type)
1177 struct gfs2_inode *ip = GFS2_I(inode);
1178 struct gfs2_sbd *sdp = GFS2_SB(inode);
1179 struct gfs2_ea_location el;
1180 unsigned int namel = strlen(name);
1183 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1185 if (namel > GFS2_EA_MAX_NAME_LEN)
1189 return gfs2_xattr_remove(ip, type, name);
1191 if (ea_check_size(sdp, namel, size))
1195 if (flags & XATTR_REPLACE)
1197 return ea_init(ip, type, name, value, size);
1200 error = gfs2_ea_find(ip, type, name, &el);
1205 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1211 if (!(flags & XATTR_CREATE)) {
1212 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1213 error = ea_set_i(ip, type, name, value, size, &el);
1214 if (!error && unstuffed)
1215 ea_set_remove_unstuffed(ip, &el);
1223 if (!(flags & XATTR_REPLACE))
1224 error = ea_set_i(ip, type, name, value, size, NULL);
1229 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1230 const void *value, size_t size, int flags, int type)
1232 return __gfs2_xattr_set(dentry->d_inode, name, value,
1237 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1238 struct gfs2_ea_header *ea, char *data)
1240 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1241 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1242 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1245 ret = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1249 ret = gfs2_iter_unstuffed(ip, ea, data, NULL);
1250 gfs2_trans_end(sdp);
1255 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1257 struct inode *inode = &ip->i_inode;
1258 struct gfs2_sbd *sdp = GFS2_SB(inode);
1259 struct gfs2_ea_location el;
1262 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1266 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1267 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1269 gfs2_trans_add_meta(ip->i_gl, el.el_bh);
1270 memcpy(GFS2_EA2DATA(el.el_ea), data,
1271 GFS2_EA_DATA_LEN(el.el_ea));
1274 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1281 error = gfs2_setattr_simple(inode, attr);
1282 gfs2_trans_end(sdp);
1286 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1288 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1289 struct gfs2_rgrp_list rlist;
1290 struct buffer_head *indbh, *dibh;
1291 __be64 *eablk, *end;
1292 unsigned int rg_blocks = 0;
1294 unsigned int blen = 0;
1295 unsigned int blks = 0;
1299 error = gfs2_rindex_update(sdp);
1303 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1305 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1309 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1314 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1315 end = eablk + sdp->sd_inptrs;
1317 for (; eablk < end; eablk++) {
1322 bn = be64_to_cpu(*eablk);
1324 if (bstart + blen == bn)
1328 gfs2_rlist_add(ip, &rlist, bstart);
1335 gfs2_rlist_add(ip, &rlist, bstart);
1339 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1341 for (x = 0; x < rlist.rl_rgrps; x++) {
1342 struct gfs2_rgrpd *rgd;
1343 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1344 rg_blocks += rgd->rd_length;
1347 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1349 goto out_rlist_free;
1351 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1352 RES_STATFS + RES_QUOTA, blks);
1356 gfs2_trans_add_meta(ip->i_gl, indbh);
1358 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1362 for (; eablk < end; eablk++) {
1367 bn = be64_to_cpu(*eablk);
1369 if (bstart + blen == bn)
1373 gfs2_free_meta(ip, bstart, blen);
1379 gfs2_add_inode_blocks(&ip->i_inode, -1);
1382 gfs2_free_meta(ip, bstart, blen);
1384 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1386 error = gfs2_meta_inode_buffer(ip, &dibh);
1388 gfs2_trans_add_meta(ip->i_gl, dibh);
1389 gfs2_dinode_out(ip, dibh->b_data);
1393 gfs2_trans_end(sdp);
1396 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1398 gfs2_rlist_free(&rlist);
1404 static int ea_dealloc_block(struct gfs2_inode *ip)
1406 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1407 struct gfs2_rgrpd *rgd;
1408 struct buffer_head *dibh;
1409 struct gfs2_holder gh;
1412 error = gfs2_rindex_update(sdp);
1416 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1418 gfs2_consist_inode(ip);
1422 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1426 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1431 gfs2_free_meta(ip, ip->i_eattr, 1);
1434 gfs2_add_inode_blocks(&ip->i_inode, -1);
1436 error = gfs2_meta_inode_buffer(ip, &dibh);
1438 gfs2_trans_add_meta(ip->i_gl, dibh);
1439 gfs2_dinode_out(ip, dibh->b_data);
1443 gfs2_trans_end(sdp);
1446 gfs2_glock_dq_uninit(&gh);
1451 * gfs2_ea_dealloc - deallocate the extended attribute fork
1457 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1461 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1465 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1469 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1473 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1474 error = ea_dealloc_indirect(ip);
1479 error = ea_dealloc_block(ip);
1482 gfs2_quota_unhold(ip);
1486 static const struct xattr_handler gfs2_xattr_user_handler = {
1487 .prefix = XATTR_USER_PREFIX,
1488 .flags = GFS2_EATYPE_USR,
1489 .get = gfs2_xattr_get,
1490 .set = gfs2_xattr_set,
1493 static const struct xattr_handler gfs2_xattr_security_handler = {
1494 .prefix = XATTR_SECURITY_PREFIX,
1495 .flags = GFS2_EATYPE_SECURITY,
1496 .get = gfs2_xattr_get,
1497 .set = gfs2_xattr_set,
1500 const struct xattr_handler *gfs2_xattr_handlers[] = {
1501 &gfs2_xattr_user_handler,
1502 &gfs2_xattr_security_handler,
1503 &gfs2_xattr_system_handler,