1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
7 #include <linux/slab.h>
8 #include <linux/spinlock.h>
9 #include <linux/completion.h>
10 #include <linux/buffer_head.h>
11 #include <linux/xattr.h>
12 #include <linux/gfs2_ondisk.h>
13 #include <linux/posix_acl_xattr.h>
14 #include <linux/uaccess.h>
30 * ea_calc_size - returns the acutal number of bytes the request will take up
31 * (not counting any unstuffed data blocks)
36 * Returns: 1 if the EA should be stuffed
39 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
42 unsigned int jbsize = sdp->sd_jbsize;
45 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
51 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
52 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
57 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
61 if (dsize > GFS2_EA_MAX_DATA_LEN)
64 ea_calc_size(sdp, nsize, dsize, &size);
66 /* This can only happen with 512 byte blocks */
67 if (size > sdp->sd_jbsize)
73 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
74 struct gfs2_ea_header *ea,
75 struct gfs2_ea_header *prev, void *private);
77 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
78 ea_call_t ea_call, void *data)
80 struct gfs2_ea_header *ea, *prev = NULL;
83 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
86 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
87 if (!GFS2_EA_REC_LEN(ea))
89 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
90 bh->b_data + bh->b_size))
92 if (!GFS2_EATYPE_VALID(ea->ea_type))
95 error = ea_call(ip, bh, ea, prev, data);
99 if (GFS2_EA_IS_LAST(ea)) {
100 if ((char *)GFS2_EA2NEXT(ea) !=
101 bh->b_data + bh->b_size)
110 gfs2_consist_inode(ip);
114 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
116 struct buffer_head *bh, *eabh;
120 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
124 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
125 error = ea_foreach_i(ip, bh, ea_call, data);
129 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
134 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
135 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
137 for (; eablk < end; eablk++) {
142 bn = be64_to_cpu(*eablk);
144 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
147 error = ea_foreach_i(ip, eabh, ea_call, data);
161 struct gfs2_ea_location *ef_el;
164 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
165 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
168 struct ea_find *ef = private;
170 if (ea->ea_type == GFS2_EATYPE_UNUSED)
173 if (ea->ea_type == ef->type) {
174 if (ea->ea_name_len == ef->namel &&
175 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
176 struct gfs2_ea_location *el = ef->ef_el;
188 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
189 struct gfs2_ea_location *el)
196 ef.namel = strlen(name);
199 memset(el, 0, sizeof(struct gfs2_ea_location));
201 error = ea_foreach(ip, ea_find_i, &ef);
209 * ea_dealloc_unstuffed -
216 * Take advantage of the fact that all unstuffed blocks are
217 * allocated from the same RG. But watch, this may not always
223 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
224 struct gfs2_ea_header *ea,
225 struct gfs2_ea_header *prev, void *private)
227 int *leave = private;
228 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
229 struct gfs2_rgrpd *rgd;
230 struct gfs2_holder rg_gh;
234 unsigned int blen = 0;
235 unsigned int blks = 0;
239 error = gfs2_rindex_update(sdp);
243 if (GFS2_EA_IS_STUFFED(ea))
246 dataptrs = GFS2_EA2DATAPTRS(ea);
247 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
250 bn = be64_to_cpu(*dataptrs);
256 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
258 gfs2_consist_inode(ip);
262 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
266 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
267 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
271 gfs2_trans_add_meta(ip->i_gl, bh);
273 dataptrs = GFS2_EA2DATAPTRS(ea);
274 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
277 bn = be64_to_cpu(*dataptrs);
279 if (bstart + blen == bn)
283 gfs2_free_meta(ip, rgd, bstart, blen);
289 gfs2_add_inode_blocks(&ip->i_inode, -1);
292 gfs2_free_meta(ip, rgd, bstart, blen);
294 if (prev && !leave) {
297 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
298 prev->ea_rec_len = cpu_to_be32(len);
300 if (GFS2_EA_IS_LAST(ea))
301 prev->ea_flags |= GFS2_EAFLAG_LAST;
303 ea->ea_type = GFS2_EATYPE_UNUSED;
307 ip->i_inode.i_ctime = current_time(&ip->i_inode);
308 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
313 gfs2_glock_dq_uninit(&rg_gh);
317 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
318 struct gfs2_ea_header *ea,
319 struct gfs2_ea_header *prev, int leave)
323 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
327 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
331 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
333 gfs2_quota_unhold(ip);
339 struct gfs2_ea_request *ei_er;
340 unsigned int ei_size;
343 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
344 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
347 struct ea_list *ei = private;
348 struct gfs2_ea_request *er = ei->ei_er;
349 unsigned int ea_size;
353 if (ea->ea_type == GFS2_EATYPE_UNUSED)
356 switch (ea->ea_type) {
357 case GFS2_EATYPE_USR:
361 case GFS2_EATYPE_SYS:
365 case GFS2_EATYPE_SECURITY:
366 prefix = "security.";
373 ea_size = l + ea->ea_name_len + 1;
374 if (er->er_data_len) {
375 if (ei->ei_size + ea_size > er->er_data_len)
378 memcpy(er->er_data + ei->ei_size, prefix, l);
379 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
381 er->er_data[ei->ei_size + ea_size - 1] = 0;
384 ei->ei_size += ea_size;
390 * gfs2_listxattr - List gfs2 extended attributes
391 * @dentry: The dentry whose inode we are interested in
392 * @buffer: The buffer to write the results
393 * @size: The size of the buffer
395 * Returns: actual size of data on success, -errno on error
398 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
400 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
401 struct gfs2_ea_request er;
402 struct gfs2_holder i_gh;
405 memset(&er, 0, sizeof(struct gfs2_ea_request));
408 er.er_data_len = size;
411 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
416 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
418 error = ea_foreach(ip, ea_list_i, &ei);
423 gfs2_glock_dq_uninit(&i_gh);
429 * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
431 * @ip: The GFS2 inode
432 * @ea: The extended attribute header structure
433 * @din: The data to be copied in
434 * @dout: The data to be copied out (one of din,dout will be NULL)
439 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
440 const char *din, char *dout)
442 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
443 struct buffer_head **bh;
444 unsigned int amount = GFS2_EA_DATA_LEN(ea);
445 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
446 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
452 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
456 for (x = 0; x < nptrs; x++) {
457 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
467 for (x = 0; x < nptrs; x++) {
468 error = gfs2_meta_wait(sdp, bh[x]);
470 for (; x < nptrs; x++)
474 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
475 for (; x < nptrs; x++)
481 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
482 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
485 memcpy(dout, pos, cp_size);
486 dout += sdp->sd_jbsize;
490 gfs2_trans_add_meta(ip->i_gl, bh[x]);
491 memcpy(pos, din, cp_size);
492 din += sdp->sd_jbsize;
495 amount -= sdp->sd_jbsize;
504 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
505 char *data, size_t size)
508 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
512 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
513 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
516 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
522 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
524 struct gfs2_ea_location el;
529 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
534 if (!GFS2_EA_DATA_LEN(el.el_ea))
537 len = GFS2_EA_DATA_LEN(el.el_ea);
538 data = kmalloc(len, GFP_NOFS);
543 error = gfs2_ea_get_copy(ip, &el, data, len);
554 * gfs2_xattr_get - Get a GFS2 extended attribute
556 * @name: The name of the extended attribute
557 * @buffer: The buffer to write the result into
558 * @size: The size of the buffer
559 * @type: The type of extended attribute
561 * Returns: actual size of data on success, -errno on error
563 static int __gfs2_xattr_get(struct inode *inode, const char *name,
564 void *buffer, size_t size, int type)
566 struct gfs2_inode *ip = GFS2_I(inode);
567 struct gfs2_ea_location el;
572 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
575 error = gfs2_ea_find(ip, type, name, &el);
581 error = gfs2_ea_get_copy(ip, &el, buffer, size);
583 error = GFS2_EA_DATA_LEN(el.el_ea);
589 static int gfs2_xattr_get(const struct xattr_handler *handler,
590 struct dentry *unused, struct inode *inode,
591 const char *name, void *buffer, size_t size)
593 struct gfs2_inode *ip = GFS2_I(inode);
594 struct gfs2_holder gh;
597 /* During lookup, SELinux calls this function with the glock locked. */
599 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
600 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
604 gfs2_holder_mark_uninitialized(&gh);
606 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
607 if (gfs2_holder_initialized(&gh))
608 gfs2_glock_dq_uninit(&gh);
613 * ea_alloc_blk - allocates a new block for extended attributes.
614 * @ip: A pointer to the inode that's getting extended attributes
615 * @bhp: Pointer to pointer to a struct buffer_head
620 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
622 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
623 struct gfs2_ea_header *ea;
628 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
631 gfs2_trans_remove_revoke(sdp, block, 1);
632 *bhp = gfs2_meta_new(ip->i_gl, block);
633 gfs2_trans_add_meta(ip->i_gl, *bhp);
634 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
635 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
637 ea = GFS2_EA_BH2FIRST(*bhp);
638 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
639 ea->ea_type = GFS2_EATYPE_UNUSED;
640 ea->ea_flags = GFS2_EAFLAG_LAST;
643 gfs2_add_inode_blocks(&ip->i_inode, 1);
649 * ea_write - writes the request info to an ea, creating new blocks if
651 * @ip: inode that is being modified
652 * @ea: the location of the new ea in a block
653 * @er: the write request
655 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
660 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
661 struct gfs2_ea_request *er)
663 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
666 ea->ea_data_len = cpu_to_be32(er->er_data_len);
667 ea->ea_name_len = er->er_name_len;
668 ea->ea_type = er->er_type;
671 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
673 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
675 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
677 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
678 const char *data = er->er_data;
679 unsigned int data_len = er->er_data_len;
683 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
684 for (x = 0; x < ea->ea_num_ptrs; x++) {
685 struct buffer_head *bh;
687 int mh_size = sizeof(struct gfs2_meta_header);
690 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
693 gfs2_trans_remove_revoke(sdp, block, 1);
694 bh = gfs2_meta_new(ip->i_gl, block);
695 gfs2_trans_add_meta(ip->i_gl, bh);
696 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
698 gfs2_add_inode_blocks(&ip->i_inode, 1);
700 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
702 memcpy(bh->b_data + mh_size, data, copy);
703 if (copy < sdp->sd_jbsize)
704 memset(bh->b_data + mh_size + copy, 0,
705 sdp->sd_jbsize - copy);
707 *dataptr++ = cpu_to_be64(bh->b_blocknr);
714 gfs2_assert_withdraw(sdp, !data_len);
720 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
721 struct gfs2_ea_request *er, void *private);
723 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
725 ea_skeleton_call_t skeleton_call, void *private)
727 struct gfs2_alloc_parms ap = { .target = blks };
730 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
734 error = gfs2_quota_lock_check(ip, &ap);
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 ip->i_inode.i_ctime = current_time(&ip->i_inode);
753 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
756 gfs2_trans_end(GFS2_SB(&ip->i_inode));
758 gfs2_inplace_release(ip);
760 gfs2_quota_unlock(ip);
764 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
767 struct buffer_head *bh;
770 error = ea_alloc_blk(ip, &bh);
774 ip->i_eattr = bh->b_blocknr;
775 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
783 * ea_init - initializes a new eattr block
790 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
791 const void *data, size_t size)
793 struct gfs2_ea_request er;
794 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
795 unsigned int blks = 1;
799 er.er_name_len = strlen(name);
800 er.er_data = (void *)data;
801 er.er_data_len = size;
803 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
804 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
806 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
809 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
811 u32 ea_size = GFS2_EA_SIZE(ea);
812 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
814 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
815 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
817 ea->ea_rec_len = cpu_to_be32(ea_size);
818 ea->ea_flags ^= last;
820 new->ea_rec_len = cpu_to_be32(new_size);
821 new->ea_flags = last;
826 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
827 struct gfs2_ea_location *el)
829 struct gfs2_ea_header *ea = el->el_ea;
830 struct gfs2_ea_header *prev = el->el_prev;
833 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
835 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
836 ea->ea_type = GFS2_EATYPE_UNUSED;
838 } else if (GFS2_EA2NEXT(prev) != ea) {
839 prev = GFS2_EA2NEXT(prev);
840 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
843 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
844 prev->ea_rec_len = cpu_to_be32(len);
846 if (GFS2_EA_IS_LAST(ea))
847 prev->ea_flags |= GFS2_EAFLAG_LAST;
853 struct gfs2_ea_request *es_er;
854 struct gfs2_ea_location *es_el;
856 struct buffer_head *es_bh;
857 struct gfs2_ea_header *es_ea;
860 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
861 struct gfs2_ea_header *ea, struct ea_set *es)
863 struct gfs2_ea_request *er = es->es_er;
866 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
870 gfs2_trans_add_meta(ip->i_gl, bh);
873 ea = ea_split_ea(ea);
875 ea_write(ip, ea, er);
878 ea_set_remove_stuffed(ip, es->es_el);
880 ip->i_inode.i_ctime = current_time(&ip->i_inode);
881 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
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_meta(ip->i_gl, es->es_bh);
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, 0,
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_meta(ip->i_gl, indbh);
994 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
997 gfs2_trans_remove_revoke(sdp, blk, 1);
998 indbh = gfs2_meta_new(ip->i_gl, blk);
999 gfs2_trans_add_meta(ip->i_gl, indbh);
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;
1080 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1084 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1089 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1090 prev->ea_rec_len = cpu_to_be32(len);
1092 if (GFS2_EA_IS_LAST(ea))
1093 prev->ea_flags |= GFS2_EAFLAG_LAST;
1095 ea->ea_type = GFS2_EATYPE_UNUSED;
1098 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1099 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1101 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1107 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1109 * @type: The type of the extended attribute
1110 * @name: The name of the extended attribute
1112 * This is not called directly by the VFS since we use the (common)
1113 * scheme of making a "set with NULL data" mean a remove request. Note
1114 * that this is different from a set with zero length data.
1116 * Returns: 0, or errno on failure
1119 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1121 struct gfs2_ea_location el;
1127 error = gfs2_ea_find(ip, type, name, &el);
1133 if (GFS2_EA_IS_STUFFED(el.el_ea))
1134 error = ea_remove_stuffed(ip, &el);
1136 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1144 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1146 * @name: The name of the extended attribute
1147 * @value: The value of the extended attribute (NULL for remove)
1148 * @size: The size of the @value argument
1149 * @flags: Create or Replace
1150 * @type: The type of the extended attribute
1152 * See gfs2_xattr_remove() for details of the removal of xattrs.
1154 * Returns: 0 or errno on failure
1157 int __gfs2_xattr_set(struct inode *inode, const char *name,
1158 const void *value, size_t size, int flags, int type)
1160 struct gfs2_inode *ip = GFS2_I(inode);
1161 struct gfs2_sbd *sdp = GFS2_SB(inode);
1162 struct gfs2_ea_location el;
1163 unsigned int namel = strlen(name);
1166 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1168 if (namel > GFS2_EA_MAX_NAME_LEN)
1171 if (value == NULL) {
1172 error = gfs2_xattr_remove(ip, type, name);
1173 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1178 if (ea_check_size(sdp, namel, size))
1182 if (flags & XATTR_REPLACE)
1184 return ea_init(ip, type, name, value, size);
1187 error = gfs2_ea_find(ip, type, name, &el);
1192 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1198 if (!(flags & XATTR_CREATE)) {
1199 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1200 error = ea_set_i(ip, type, name, value, size, &el);
1201 if (!error && unstuffed)
1202 ea_set_remove_unstuffed(ip, &el);
1210 if (!(flags & XATTR_REPLACE))
1211 error = ea_set_i(ip, type, name, value, size, NULL);
1216 static int gfs2_xattr_set(const struct xattr_handler *handler,
1217 struct dentry *unused, struct inode *inode,
1218 const char *name, const void *value,
1219 size_t size, int flags)
1221 struct gfs2_inode *ip = GFS2_I(inode);
1222 struct gfs2_holder gh;
1225 ret = gfs2_rsqa_alloc(ip);
1229 /* May be called from gfs_setattr with the glock locked. */
1231 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1232 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1236 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
1238 gfs2_holder_mark_uninitialized(&gh);
1240 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1241 if (gfs2_holder_initialized(&gh))
1242 gfs2_glock_dq_uninit(&gh);
1246 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1248 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1249 struct gfs2_rgrp_list rlist;
1250 struct gfs2_rgrpd *rgd;
1251 struct buffer_head *indbh, *dibh;
1252 __be64 *eablk, *end;
1253 unsigned int rg_blocks = 0;
1255 unsigned int blen = 0;
1256 unsigned int blks = 0;
1260 error = gfs2_rindex_update(sdp);
1264 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1266 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1270 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1275 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1276 end = eablk + sdp->sd_inptrs;
1278 for (; eablk < end; eablk++) {
1283 bn = be64_to_cpu(*eablk);
1285 if (bstart + blen == bn)
1289 gfs2_rlist_add(ip, &rlist, bstart);
1296 gfs2_rlist_add(ip, &rlist, bstart);
1300 gfs2_rlist_alloc(&rlist);
1302 for (x = 0; x < rlist.rl_rgrps; x++) {
1303 rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1304 rg_blocks += rgd->rd_length;
1307 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1309 goto out_rlist_free;
1311 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1312 RES_STATFS + RES_QUOTA, blks);
1316 gfs2_trans_add_meta(ip->i_gl, indbh);
1318 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1323 for (; eablk < end; eablk++) {
1328 bn = be64_to_cpu(*eablk);
1330 if (bstart + blen == bn)
1334 gfs2_free_meta(ip, rgd, bstart, blen);
1336 rgd = gfs2_blk2rgrpd(sdp, bstart, true);
1341 gfs2_add_inode_blocks(&ip->i_inode, -1);
1344 gfs2_free_meta(ip, rgd, bstart, blen);
1346 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1348 error = gfs2_meta_inode_buffer(ip, &dibh);
1350 gfs2_trans_add_meta(ip->i_gl, dibh);
1351 gfs2_dinode_out(ip, dibh->b_data);
1355 gfs2_trans_end(sdp);
1358 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1360 gfs2_rlist_free(&rlist);
1366 static int ea_dealloc_block(struct gfs2_inode *ip)
1368 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1369 struct gfs2_rgrpd *rgd;
1370 struct buffer_head *dibh;
1371 struct gfs2_holder gh;
1374 error = gfs2_rindex_update(sdp);
1378 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1380 gfs2_consist_inode(ip);
1384 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1388 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1393 gfs2_free_meta(ip, rgd, ip->i_eattr, 1);
1396 gfs2_add_inode_blocks(&ip->i_inode, -1);
1398 error = gfs2_meta_inode_buffer(ip, &dibh);
1400 gfs2_trans_add_meta(ip->i_gl, dibh);
1401 gfs2_dinode_out(ip, dibh->b_data);
1405 gfs2_trans_end(sdp);
1408 gfs2_glock_dq_uninit(&gh);
1413 * gfs2_ea_dealloc - deallocate the extended attribute fork
1419 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1423 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1427 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1431 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1435 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1436 error = ea_dealloc_indirect(ip);
1441 error = ea_dealloc_block(ip);
1444 gfs2_quota_unhold(ip);
1448 static const struct xattr_handler gfs2_xattr_user_handler = {
1449 .prefix = XATTR_USER_PREFIX,
1450 .flags = GFS2_EATYPE_USR,
1451 .get = gfs2_xattr_get,
1452 .set = gfs2_xattr_set,
1455 static const struct xattr_handler gfs2_xattr_security_handler = {
1456 .prefix = XATTR_SECURITY_PREFIX,
1457 .flags = GFS2_EATYPE_SECURITY,
1458 .get = gfs2_xattr_get,
1459 .set = gfs2_xattr_set,
1462 const struct xattr_handler *gfs2_xattr_handlers[] = {
1463 &gfs2_xattr_user_handler,
1464 &gfs2_xattr_security_handler,
1465 &posix_acl_access_xattr_handler,
1466 &posix_acl_default_xattr_handler,