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 = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
337 gfs2_quota_unhold(ip);
344 struct gfs2_ea_request *ei_er;
345 unsigned int ei_size;
348 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
350 switch (ea->ea_type) {
351 case GFS2_EATYPE_USR:
352 return 5 + ea->ea_name_len + 1;
353 case GFS2_EATYPE_SYS:
354 return 7 + ea->ea_name_len + 1;
355 case GFS2_EATYPE_SECURITY:
356 return 9 + ea->ea_name_len + 1;
362 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
363 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
366 struct ea_list *ei = private;
367 struct gfs2_ea_request *er = ei->ei_er;
368 unsigned int ea_size = gfs2_ea_strlen(ea);
370 if (ea->ea_type == GFS2_EATYPE_UNUSED)
373 if (er->er_data_len) {
378 if (ei->ei_size + ea_size > er->er_data_len)
381 switch (ea->ea_type) {
382 case GFS2_EATYPE_USR:
386 case GFS2_EATYPE_SYS:
390 case GFS2_EATYPE_SECURITY:
391 prefix = "security.";
398 memcpy(er->er_data + ei->ei_size, prefix, l);
399 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
401 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
404 ei->ei_size += ea_size;
410 * gfs2_listxattr - List gfs2 extended attributes
411 * @dentry: The dentry whose inode we are interested in
412 * @buffer: The buffer to write the results
413 * @size: The size of the buffer
415 * Returns: actual size of data on success, -errno on error
418 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
420 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
421 struct gfs2_ea_request er;
422 struct gfs2_holder i_gh;
425 memset(&er, 0, sizeof(struct gfs2_ea_request));
428 er.er_data_len = size;
431 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
436 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
438 error = ea_foreach(ip, ea_list_i, &ei);
443 gfs2_glock_dq_uninit(&i_gh);
449 * ea_get_unstuffed - actually copies the unstuffed data into the
451 * @ip: The GFS2 inode
452 * @ea: The extended attribute header structure
453 * @data: The data to be copied
458 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
461 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
462 struct buffer_head **bh;
463 unsigned int amount = GFS2_EA_DATA_LEN(ea);
464 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
465 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
469 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
473 for (x = 0; x < nptrs; x++) {
474 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
484 for (x = 0; x < nptrs; x++) {
485 error = gfs2_meta_wait(sdp, bh[x]);
487 for (; x < nptrs; x++)
491 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
492 for (; x < nptrs; x++)
498 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
499 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
501 amount -= sdp->sd_jbsize;
502 data += sdp->sd_jbsize;
512 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
513 char *data, size_t size)
516 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
520 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
521 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
524 ret = ea_get_unstuffed(ip, el->el_ea, data);
530 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
532 struct gfs2_ea_location el;
537 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
542 if (!GFS2_EA_DATA_LEN(el.el_ea))
545 len = GFS2_EA_DATA_LEN(el.el_ea);
546 data = kmalloc(len, GFP_NOFS);
551 error = gfs2_ea_get_copy(ip, &el, data, len);
561 * gfs2_xattr_get - Get a GFS2 extended attribute
563 * @name: The name of the extended attribute
564 * @buffer: The buffer to write the result into
565 * @size: The size of the buffer
566 * @type: The type of extended attribute
568 * Returns: actual size of data on success, -errno on error
570 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
571 void *buffer, size_t size, int type)
573 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
574 struct gfs2_ea_location el;
579 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
582 error = gfs2_ea_find(ip, type, name, &el);
588 error = gfs2_ea_get_copy(ip, &el, buffer, size);
590 error = GFS2_EA_DATA_LEN(el.el_ea);
597 * ea_alloc_blk - allocates a new block for extended attributes.
598 * @ip: A pointer to the inode that's getting extended attributes
599 * @bhp: Pointer to pointer to a struct buffer_head
604 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
606 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
607 struct gfs2_ea_header *ea;
612 error = gfs2_alloc_block(ip, &block, &n);
615 gfs2_trans_add_unrevoke(sdp, block, 1);
616 *bhp = gfs2_meta_new(ip->i_gl, block);
617 gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
618 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
619 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
621 ea = GFS2_EA_BH2FIRST(*bhp);
622 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
623 ea->ea_type = GFS2_EATYPE_UNUSED;
624 ea->ea_flags = GFS2_EAFLAG_LAST;
627 gfs2_add_inode_blocks(&ip->i_inode, 1);
633 * ea_write - writes the request info to an ea, creating new blocks if
635 * @ip: inode that is being modified
636 * @ea: the location of the new ea in a block
637 * @er: the write request
639 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
644 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
645 struct gfs2_ea_request *er)
647 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
650 ea->ea_data_len = cpu_to_be32(er->er_data_len);
651 ea->ea_name_len = er->er_name_len;
652 ea->ea_type = er->er_type;
655 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
657 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
659 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
661 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
662 const char *data = er->er_data;
663 unsigned int data_len = er->er_data_len;
667 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
668 for (x = 0; x < ea->ea_num_ptrs; x++) {
669 struct buffer_head *bh;
671 int mh_size = sizeof(struct gfs2_meta_header);
674 error = gfs2_alloc_block(ip, &block, &n);
677 gfs2_trans_add_unrevoke(sdp, block, 1);
678 bh = gfs2_meta_new(ip->i_gl, block);
679 gfs2_trans_add_bh(ip->i_gl, bh, 1);
680 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
682 gfs2_add_inode_blocks(&ip->i_inode, 1);
684 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
686 memcpy(bh->b_data + mh_size, data, copy);
687 if (copy < sdp->sd_jbsize)
688 memset(bh->b_data + mh_size + copy, 0,
689 sdp->sd_jbsize - copy);
691 *dataptr++ = cpu_to_be64(bh->b_blocknr);
698 gfs2_assert_withdraw(sdp, !data_len);
704 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
705 struct gfs2_ea_request *er, void *private);
707 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
709 ea_skeleton_call_t skeleton_call, void *private)
711 struct gfs2_alloc *al;
712 struct buffer_head *dibh;
715 al = gfs2_alloc_get(ip);
719 error = gfs2_quota_lock_check(ip);
723 al->al_requested = blks;
725 error = gfs2_inplace_reserve(ip);
729 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
730 blks + gfs2_rg_blocks(ip) +
731 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
735 error = skeleton_call(ip, er, private);
739 error = gfs2_meta_inode_buffer(ip, &dibh);
741 ip->i_inode.i_ctime = CURRENT_TIME;
742 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
743 gfs2_dinode_out(ip, dibh->b_data);
748 gfs2_trans_end(GFS2_SB(&ip->i_inode));
750 gfs2_inplace_release(ip);
752 gfs2_quota_unlock(ip);
758 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
761 struct buffer_head *bh;
764 error = ea_alloc_blk(ip, &bh);
768 ip->i_eattr = bh->b_blocknr;
769 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
777 * ea_init - initializes a new eattr block
784 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
785 const void *data, size_t size)
787 struct gfs2_ea_request er;
788 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
789 unsigned int blks = 1;
793 er.er_name_len = strlen(name);
794 er.er_data = (void *)data;
795 er.er_data_len = size;
797 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
798 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
800 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
803 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
805 u32 ea_size = GFS2_EA_SIZE(ea);
806 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
808 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
809 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
811 ea->ea_rec_len = cpu_to_be32(ea_size);
812 ea->ea_flags ^= last;
814 new->ea_rec_len = cpu_to_be32(new_size);
815 new->ea_flags = last;
820 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
821 struct gfs2_ea_location *el)
823 struct gfs2_ea_header *ea = el->el_ea;
824 struct gfs2_ea_header *prev = el->el_prev;
827 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
829 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
830 ea->ea_type = GFS2_EATYPE_UNUSED;
832 } else if (GFS2_EA2NEXT(prev) != ea) {
833 prev = GFS2_EA2NEXT(prev);
834 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
837 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
838 prev->ea_rec_len = cpu_to_be32(len);
840 if (GFS2_EA_IS_LAST(ea))
841 prev->ea_flags |= GFS2_EAFLAG_LAST;
847 struct gfs2_ea_request *es_er;
848 struct gfs2_ea_location *es_el;
850 struct buffer_head *es_bh;
851 struct gfs2_ea_header *es_ea;
854 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
855 struct gfs2_ea_header *ea, struct ea_set *es)
857 struct gfs2_ea_request *er = es->es_er;
858 struct buffer_head *dibh;
861 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
865 gfs2_trans_add_bh(ip->i_gl, bh, 1);
868 ea = ea_split_ea(ea);
870 ea_write(ip, ea, er);
873 ea_set_remove_stuffed(ip, es->es_el);
875 error = gfs2_meta_inode_buffer(ip, &dibh);
878 ip->i_inode.i_ctime = CURRENT_TIME;
879 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
880 gfs2_dinode_out(ip, dibh->b_data);
883 gfs2_trans_end(GFS2_SB(&ip->i_inode));
887 static int ea_set_simple_alloc(struct gfs2_inode *ip,
888 struct gfs2_ea_request *er, void *private)
890 struct ea_set *es = private;
891 struct gfs2_ea_header *ea = es->es_ea;
894 gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
897 ea = ea_split_ea(ea);
899 error = ea_write(ip, ea, er);
904 ea_set_remove_stuffed(ip, es->es_el);
909 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
910 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
913 struct ea_set *es = private;
918 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
919 es->es_er->er_data_len, &size);
921 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
922 if (GFS2_EA_REC_LEN(ea) < size)
924 if (!GFS2_EA_IS_STUFFED(ea)) {
925 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
930 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
936 error = ea_set_simple_noalloc(ip, bh, ea, es);
944 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
945 GFS2_SB(&ip->i_inode)->sd_jbsize);
947 error = ea_alloc_skeleton(ip, es->es_er, blks,
948 ea_set_simple_alloc, es);
956 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
959 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
960 struct buffer_head *indbh, *newbh;
963 int mh_size = sizeof(struct gfs2_meta_header);
965 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
968 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
973 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
978 eablk = (__be64 *)(indbh->b_data + mh_size);
979 end = eablk + sdp->sd_inptrs;
981 for (; eablk < end; eablk++)
990 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
994 error = gfs2_alloc_block(ip, &blk, &n);
997 gfs2_trans_add_unrevoke(sdp, blk, 1);
998 indbh = gfs2_meta_new(ip->i_gl, blk);
999 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1000 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1001 gfs2_buffer_clear_tail(indbh, mh_size);
1003 eablk = (__be64 *)(indbh->b_data + mh_size);
1004 *eablk = cpu_to_be64(ip->i_eattr);
1006 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1007 gfs2_add_inode_blocks(&ip->i_inode, 1);
1012 error = ea_alloc_blk(ip, &newbh);
1016 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1017 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1023 ea_set_remove_stuffed(ip, private);
1030 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1031 const void *value, size_t size, struct gfs2_ea_location *el)
1033 struct gfs2_ea_request er;
1035 unsigned int blks = 2;
1040 er.er_data = (void *)value;
1041 er.er_name_len = strlen(name);
1042 er.er_data_len = size;
1044 memset(&es, 0, sizeof(struct ea_set));
1048 error = ea_foreach(ip, ea_set_simple, &es);
1054 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1056 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1057 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1059 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1062 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1063 struct gfs2_ea_location *el)
1065 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1066 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1067 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1068 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1071 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1074 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1076 struct gfs2_ea_header *ea = el->el_ea;
1077 struct gfs2_ea_header *prev = el->el_prev;
1078 struct buffer_head *dibh;
1081 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1085 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1090 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1091 prev->ea_rec_len = cpu_to_be32(len);
1093 if (GFS2_EA_IS_LAST(ea))
1094 prev->ea_flags |= GFS2_EAFLAG_LAST;
1096 ea->ea_type = GFS2_EATYPE_UNUSED;
1099 error = gfs2_meta_inode_buffer(ip, &dibh);
1101 ip->i_inode.i_ctime = CURRENT_TIME;
1102 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1103 gfs2_dinode_out(ip, dibh->b_data);
1107 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1113 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1115 * @type: The type of the extended attribute
1116 * @name: The name of the extended attribute
1118 * This is not called directly by the VFS since we use the (common)
1119 * scheme of making a "set with NULL data" mean a remove request. Note
1120 * that this is different from a set with zero length data.
1122 * Returns: 0, or errno on failure
1125 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1127 struct gfs2_ea_location el;
1133 error = gfs2_ea_find(ip, type, name, &el);
1139 if (GFS2_EA_IS_STUFFED(el.el_ea))
1140 error = ea_remove_stuffed(ip, &el);
1142 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1150 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1152 * @name: The name of the extended attribute
1153 * @value: The value of the extended attribute (NULL for remove)
1154 * @size: The size of the @value argument
1155 * @flags: Create or Replace
1156 * @type: The type of the extended attribute
1158 * See gfs2_xattr_remove() for details of the removal of xattrs.
1160 * Returns: 0 or errno on failure
1163 int __gfs2_xattr_set(struct inode *inode, const char *name,
1164 const void *value, size_t size, int flags, int type)
1166 struct gfs2_inode *ip = GFS2_I(inode);
1167 struct gfs2_sbd *sdp = GFS2_SB(inode);
1168 struct gfs2_ea_location el;
1169 unsigned int namel = strlen(name);
1172 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1174 if (namel > GFS2_EA_MAX_NAME_LEN)
1178 return gfs2_xattr_remove(ip, type, name);
1180 if (ea_check_size(sdp, namel, size))
1184 if (flags & XATTR_REPLACE)
1186 return ea_init(ip, type, name, value, size);
1189 error = gfs2_ea_find(ip, type, name, &el);
1194 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1200 if (!(flags & XATTR_CREATE)) {
1201 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1202 error = ea_set_i(ip, type, name, value, size, &el);
1203 if (!error && unstuffed)
1204 ea_set_remove_unstuffed(ip, &el);
1212 if (!(flags & XATTR_REPLACE))
1213 error = ea_set_i(ip, type, name, value, size, NULL);
1218 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1219 const void *value, size_t size, int flags, int type)
1221 return __gfs2_xattr_set(dentry->d_inode, name, value,
1225 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1226 struct gfs2_ea_header *ea, char *data)
1228 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1229 struct buffer_head **bh;
1230 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1231 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1232 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1236 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1240 error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1244 for (x = 0; x < nptrs; x++) {
1245 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1255 for (x = 0; x < nptrs; x++) {
1256 error = gfs2_meta_wait(sdp, bh[x]);
1258 for (; x < nptrs; x++)
1262 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1263 for (; x < nptrs; x++)
1269 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1271 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1272 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1274 amount -= sdp->sd_jbsize;
1275 data += sdp->sd_jbsize;
1285 gfs2_trans_end(sdp);
1290 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1292 struct inode *inode = &ip->i_inode;
1293 struct gfs2_sbd *sdp = GFS2_SB(inode);
1294 struct gfs2_ea_location el;
1297 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1301 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1302 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1304 gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1305 memcpy(GFS2_EA2DATA(el.el_ea), data,
1306 GFS2_EA_DATA_LEN(el.el_ea));
1309 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1316 error = gfs2_setattr_simple(inode, attr);
1317 gfs2_trans_end(sdp);
1321 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1323 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1324 struct gfs2_rgrp_list rlist;
1325 struct buffer_head *indbh, *dibh;
1326 __be64 *eablk, *end;
1327 unsigned int rg_blocks = 0;
1329 unsigned int blen = 0;
1330 unsigned int blks = 0;
1334 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1336 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1340 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1345 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1346 end = eablk + sdp->sd_inptrs;
1348 for (; eablk < end; eablk++) {
1353 bn = be64_to_cpu(*eablk);
1355 if (bstart + blen == bn)
1359 gfs2_rlist_add(ip, &rlist, bstart);
1366 gfs2_rlist_add(ip, &rlist, bstart);
1370 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1372 for (x = 0; x < rlist.rl_rgrps; x++) {
1373 struct gfs2_rgrpd *rgd;
1374 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1375 rg_blocks += rgd->rd_length;
1378 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1380 goto out_rlist_free;
1382 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1383 RES_STATFS + RES_QUOTA, blks);
1387 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1389 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1393 for (; eablk < end; eablk++) {
1398 bn = be64_to_cpu(*eablk);
1400 if (bstart + blen == bn)
1404 gfs2_free_meta(ip, bstart, blen);
1410 gfs2_add_inode_blocks(&ip->i_inode, -1);
1413 gfs2_free_meta(ip, bstart, blen);
1415 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1417 error = gfs2_meta_inode_buffer(ip, &dibh);
1419 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1420 gfs2_dinode_out(ip, dibh->b_data);
1424 gfs2_trans_end(sdp);
1427 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1429 gfs2_rlist_free(&rlist);
1435 static int ea_dealloc_block(struct gfs2_inode *ip)
1437 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1438 struct gfs2_alloc *al = ip->i_alloc;
1439 struct gfs2_rgrpd *rgd;
1440 struct buffer_head *dibh;
1443 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1445 gfs2_consist_inode(ip);
1449 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1454 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1459 gfs2_free_meta(ip, ip->i_eattr, 1);
1462 gfs2_add_inode_blocks(&ip->i_inode, -1);
1464 error = gfs2_meta_inode_buffer(ip, &dibh);
1466 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1467 gfs2_dinode_out(ip, dibh->b_data);
1471 gfs2_trans_end(sdp);
1474 gfs2_glock_dq_uninit(&al->al_rgd_gh);
1479 * gfs2_ea_dealloc - deallocate the extended attribute fork
1485 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1487 struct gfs2_alloc *al;
1490 al = gfs2_alloc_get(ip);
1494 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1498 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1502 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1503 error = ea_dealloc_indirect(ip);
1508 error = ea_dealloc_block(ip);
1511 gfs2_quota_unhold(ip);
1517 static const struct xattr_handler gfs2_xattr_user_handler = {
1518 .prefix = XATTR_USER_PREFIX,
1519 .flags = GFS2_EATYPE_USR,
1520 .get = gfs2_xattr_get,
1521 .set = gfs2_xattr_set,
1524 static const struct xattr_handler gfs2_xattr_security_handler = {
1525 .prefix = XATTR_SECURITY_PREFIX,
1526 .flags = GFS2_EATYPE_SECURITY,
1527 .get = gfs2_xattr_get,
1528 .set = gfs2_xattr_set,
1531 const struct xattr_handler *gfs2_xattr_handlers[] = {
1532 &gfs2_xattr_user_handler,
1533 &gfs2_xattr_security_handler,
1534 &gfs2_xattr_system_handler,