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 actual number of bytes the request will take up
31 * (not counting any unstuffed data blocks)
33 * Returns: 1 if the EA should be stuffed
36 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
39 unsigned int jbsize = sdp->sd_jbsize;
42 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
48 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
49 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
54 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
58 if (dsize > GFS2_EA_MAX_DATA_LEN)
61 ea_calc_size(sdp, nsize, dsize, &size);
63 /* This can only happen with 512 byte blocks */
64 if (size > sdp->sd_jbsize)
70 static bool gfs2_eatype_valid(struct gfs2_sbd *sdp, u8 type)
72 switch(sdp->sd_sb.sb_fs_format) {
73 case GFS2_FS_FORMAT_MAX:
76 case GFS2_FS_FORMAT_MIN:
77 return type <= GFS2_EATYPE_SECURITY;
84 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
85 struct gfs2_ea_header *ea,
86 struct gfs2_ea_header *prev, void *private);
88 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
89 ea_call_t ea_call, void *data)
91 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
92 struct gfs2_ea_header *ea, *prev = NULL;
95 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
98 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
99 if (!GFS2_EA_REC_LEN(ea)) {
100 gfs2_consist_inode(ip);
103 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
104 bh->b_data + bh->b_size)) {
105 gfs2_consist_inode(ip);
108 if (!gfs2_eatype_valid(sdp, ea->ea_type)) {
109 gfs2_consist_inode(ip);
112 error = ea_call(ip, bh, ea, prev, data);
116 if (GFS2_EA_IS_LAST(ea)) {
117 if ((char *)GFS2_EA2NEXT(ea) !=
118 bh->b_data + bh->b_size) {
119 gfs2_consist_inode(ip);
129 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
131 struct buffer_head *bh, *eabh;
135 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
139 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
140 error = ea_foreach_i(ip, bh, ea_call, data);
144 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
149 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
150 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
152 for (; eablk < end; eablk++) {
157 bn = be64_to_cpu(*eablk);
159 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
162 error = ea_foreach_i(ip, eabh, ea_call, data);
176 struct gfs2_ea_location *ef_el;
179 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
180 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
183 struct ea_find *ef = private;
185 if (ea->ea_type == GFS2_EATYPE_UNUSED)
188 if (ea->ea_type == ef->type) {
189 if (ea->ea_name_len == ef->namel &&
190 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
191 struct gfs2_ea_location *el = ef->ef_el;
203 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
204 struct gfs2_ea_location *el)
211 ef.namel = strlen(name);
214 memset(el, 0, sizeof(struct gfs2_ea_location));
216 error = ea_foreach(ip, ea_find_i, &ef);
224 * ea_dealloc_unstuffed
226 * Take advantage of the fact that all unstuffed blocks are
227 * allocated from the same RG. But watch, this may not always
233 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
234 struct gfs2_ea_header *ea,
235 struct gfs2_ea_header *prev, void *private)
237 int *leave = private;
238 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
239 struct gfs2_rgrpd *rgd;
240 struct gfs2_holder rg_gh;
244 unsigned int blen = 0;
245 unsigned int blks = 0;
249 error = gfs2_rindex_update(sdp);
253 if (GFS2_EA_IS_STUFFED(ea))
256 dataptrs = GFS2_EA2DATAPTRS(ea);
257 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
260 bn = be64_to_cpu(*dataptrs);
266 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
268 gfs2_consist_inode(ip);
272 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
273 LM_FLAG_NODE_SCOPE, &rg_gh);
277 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
278 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
282 gfs2_trans_add_meta(ip->i_gl, bh);
284 dataptrs = GFS2_EA2DATAPTRS(ea);
285 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
288 bn = be64_to_cpu(*dataptrs);
290 if (bstart + blen == bn)
294 gfs2_free_meta(ip, rgd, bstart, blen);
300 gfs2_add_inode_blocks(&ip->i_inode, -1);
303 gfs2_free_meta(ip, rgd, bstart, blen);
305 if (prev && !leave) {
308 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
309 prev->ea_rec_len = cpu_to_be32(len);
311 if (GFS2_EA_IS_LAST(ea))
312 prev->ea_flags |= GFS2_EAFLAG_LAST;
314 ea->ea_type = GFS2_EATYPE_UNUSED;
318 inode_set_ctime_current(&ip->i_inode);
319 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
324 gfs2_glock_dq_uninit(&rg_gh);
328 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
329 struct gfs2_ea_header *ea,
330 struct gfs2_ea_header *prev, int leave)
334 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
338 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
342 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
344 gfs2_quota_unhold(ip);
350 struct gfs2_ea_request *ei_er;
351 unsigned int ei_size;
354 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
355 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
358 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
359 struct ea_list *ei = private;
360 struct gfs2_ea_request *er = ei->ei_er;
361 unsigned int ea_size;
365 if (ea->ea_type == GFS2_EATYPE_UNUSED)
368 BUG_ON(ea->ea_type > GFS2_EATYPE_SECURITY &&
369 sdp->sd_sb.sb_fs_format == GFS2_FS_FORMAT_MIN);
370 switch (ea->ea_type) {
371 case GFS2_EATYPE_USR:
375 case GFS2_EATYPE_SYS:
379 case GFS2_EATYPE_SECURITY:
380 prefix = "security.";
383 case GFS2_EATYPE_TRUSTED:
391 ea_size = l + ea->ea_name_len + 1;
392 if (er->er_data_len) {
393 if (ei->ei_size + ea_size > er->er_data_len)
396 memcpy(er->er_data + ei->ei_size, prefix, l);
397 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
399 er->er_data[ei->ei_size + ea_size - 1] = 0;
402 ei->ei_size += ea_size;
408 * gfs2_listxattr - List gfs2 extended attributes
409 * @dentry: The dentry whose inode we are interested in
410 * @buffer: The buffer to write the results
411 * @size: The size of the buffer
413 * Returns: actual size of data on success, -errno on error
416 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
418 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
419 struct gfs2_ea_request er;
420 struct gfs2_holder i_gh;
423 memset(&er, 0, sizeof(struct gfs2_ea_request));
426 er.er_data_len = size;
429 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
434 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
436 error = ea_foreach(ip, ea_list_i, &ei);
441 gfs2_glock_dq_uninit(&i_gh);
447 * gfs2_iter_unstuffed - copies the unstuffed xattr data to/from the
449 * @ip: The GFS2 inode
450 * @ea: The extended attribute header structure
451 * @din: The data to be copied in
452 * @dout: The data to be copied out (one of din,dout will be NULL)
457 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
458 const char *din, char *dout)
460 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
461 struct buffer_head **bh;
462 unsigned int amount = GFS2_EA_DATA_LEN(ea);
463 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
464 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
470 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
474 for (x = 0; x < nptrs; x++) {
475 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
485 for (x = 0; x < nptrs; x++) {
486 error = gfs2_meta_wait(sdp, bh[x]);
488 for (; x < nptrs; x++)
492 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
493 for (; x < nptrs; x++)
499 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
500 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
503 memcpy(dout, pos, cp_size);
504 dout += sdp->sd_jbsize;
508 gfs2_trans_add_meta(ip->i_gl, bh[x]);
509 memcpy(pos, din, cp_size);
510 din += sdp->sd_jbsize;
513 amount -= sdp->sd_jbsize;
522 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
523 char *data, size_t size)
526 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
530 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
531 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
534 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
540 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
542 struct gfs2_ea_location el;
547 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
552 if (!GFS2_EA_DATA_LEN(el.el_ea))
555 len = GFS2_EA_DATA_LEN(el.el_ea);
556 data = kmalloc(len, GFP_NOFS);
561 error = gfs2_ea_get_copy(ip, &el, data, len);
572 * __gfs2_xattr_get - Get a GFS2 extended attribute
574 * @name: The name of the extended attribute
575 * @buffer: The buffer to write the result into
576 * @size: The size of the buffer
577 * @type: The type of extended attribute
579 * Returns: actual size of data on success, -errno on error
581 static int __gfs2_xattr_get(struct inode *inode, const char *name,
582 void *buffer, size_t size, int type)
584 struct gfs2_inode *ip = GFS2_I(inode);
585 struct gfs2_ea_location el;
590 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
593 error = gfs2_ea_find(ip, type, name, &el);
599 error = gfs2_ea_get_copy(ip, &el, buffer, size);
601 error = GFS2_EA_DATA_LEN(el.el_ea);
607 static int gfs2_xattr_get(const struct xattr_handler *handler,
608 struct dentry *unused, struct inode *inode,
609 const char *name, void *buffer, size_t size)
611 struct gfs2_inode *ip = GFS2_I(inode);
612 struct gfs2_holder gh;
615 /* During lookup, SELinux calls this function with the glock locked. */
617 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
618 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
622 gfs2_holder_mark_uninitialized(&gh);
624 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
625 if (gfs2_holder_initialized(&gh))
626 gfs2_glock_dq_uninit(&gh);
631 * ea_alloc_blk - allocates a new block for extended attributes.
632 * @ip: A pointer to the inode that's getting extended attributes
633 * @bhp: Pointer to pointer to a struct buffer_head
638 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
640 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
641 struct gfs2_ea_header *ea;
646 error = gfs2_alloc_blocks(ip, &block, &n, 0);
649 gfs2_trans_remove_revoke(sdp, block, 1);
650 *bhp = gfs2_meta_new(ip->i_gl, block);
651 gfs2_trans_add_meta(ip->i_gl, *bhp);
652 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
653 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
655 ea = GFS2_EA_BH2FIRST(*bhp);
656 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
657 ea->ea_type = GFS2_EATYPE_UNUSED;
658 ea->ea_flags = GFS2_EAFLAG_LAST;
661 gfs2_add_inode_blocks(&ip->i_inode, 1);
667 * ea_write - writes the request info to an ea, creating new blocks if
669 * @ip: inode that is being modified
670 * @ea: the location of the new ea in a block
671 * @er: the write request
673 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
678 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
679 struct gfs2_ea_request *er)
681 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
684 ea->ea_data_len = cpu_to_be32(er->er_data_len);
685 ea->ea_name_len = er->er_name_len;
686 ea->ea_type = er->er_type;
689 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
691 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
693 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
695 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
696 const char *data = er->er_data;
697 unsigned int data_len = er->er_data_len;
701 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
702 for (x = 0; x < ea->ea_num_ptrs; x++) {
703 struct buffer_head *bh;
705 int mh_size = sizeof(struct gfs2_meta_header);
708 error = gfs2_alloc_blocks(ip, &block, &n, 0);
711 gfs2_trans_remove_revoke(sdp, block, 1);
712 bh = gfs2_meta_new(ip->i_gl, block);
713 gfs2_trans_add_meta(ip->i_gl, bh);
714 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
716 gfs2_add_inode_blocks(&ip->i_inode, 1);
718 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
720 memcpy(bh->b_data + mh_size, data, copy);
721 if (copy < sdp->sd_jbsize)
722 memset(bh->b_data + mh_size + copy, 0,
723 sdp->sd_jbsize - copy);
725 *dataptr++ = cpu_to_be64(bh->b_blocknr);
732 gfs2_assert_withdraw(sdp, !data_len);
738 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
739 struct gfs2_ea_request *er, void *private);
741 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
743 ea_skeleton_call_t skeleton_call, void *private)
745 struct gfs2_alloc_parms ap = { .target = blks };
748 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
752 error = gfs2_quota_lock_check(ip, &ap);
756 error = gfs2_inplace_reserve(ip, &ap);
760 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
761 blks + gfs2_rg_blocks(ip, blks) +
762 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
766 error = skeleton_call(ip, er, private);
770 inode_set_ctime_current(&ip->i_inode);
771 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
774 gfs2_trans_end(GFS2_SB(&ip->i_inode));
776 gfs2_inplace_release(ip);
778 gfs2_quota_unlock(ip);
782 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
785 struct buffer_head *bh;
788 error = ea_alloc_blk(ip, &bh);
792 ip->i_eattr = bh->b_blocknr;
793 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
801 * ea_init - initializes a new eattr block
805 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
806 const void *data, size_t size)
808 struct gfs2_ea_request er;
809 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
810 unsigned int blks = 1;
814 er.er_name_len = strlen(name);
815 er.er_data = (void *)data;
816 er.er_data_len = size;
818 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
819 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
821 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
824 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
826 u32 ea_size = GFS2_EA_SIZE(ea);
827 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
829 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
830 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
832 ea->ea_rec_len = cpu_to_be32(ea_size);
833 ea->ea_flags ^= last;
835 new->ea_rec_len = cpu_to_be32(new_size);
836 new->ea_flags = last;
841 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
842 struct gfs2_ea_location *el)
844 struct gfs2_ea_header *ea = el->el_ea;
845 struct gfs2_ea_header *prev = el->el_prev;
848 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
850 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
851 ea->ea_type = GFS2_EATYPE_UNUSED;
853 } else if (GFS2_EA2NEXT(prev) != ea) {
854 prev = GFS2_EA2NEXT(prev);
855 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
858 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
859 prev->ea_rec_len = cpu_to_be32(len);
861 if (GFS2_EA_IS_LAST(ea))
862 prev->ea_flags |= GFS2_EAFLAG_LAST;
868 struct gfs2_ea_request *es_er;
869 struct gfs2_ea_location *es_el;
871 struct buffer_head *es_bh;
872 struct gfs2_ea_header *es_ea;
875 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
876 struct gfs2_ea_header *ea, struct ea_set *es)
878 struct gfs2_ea_request *er = es->es_er;
881 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
885 gfs2_trans_add_meta(ip->i_gl, bh);
888 ea = ea_split_ea(ea);
890 ea_write(ip, ea, er);
893 ea_set_remove_stuffed(ip, es->es_el);
895 inode_set_ctime_current(&ip->i_inode);
896 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
898 gfs2_trans_end(GFS2_SB(&ip->i_inode));
902 static int ea_set_simple_alloc(struct gfs2_inode *ip,
903 struct gfs2_ea_request *er, void *private)
905 struct ea_set *es = private;
906 struct gfs2_ea_header *ea = es->es_ea;
909 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
912 ea = ea_split_ea(ea);
914 error = ea_write(ip, ea, er);
919 ea_set_remove_stuffed(ip, es->es_el);
924 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
925 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
928 struct ea_set *es = private;
933 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
934 es->es_er->er_data_len, &size);
936 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
937 if (GFS2_EA_REC_LEN(ea) < size)
939 if (!GFS2_EA_IS_STUFFED(ea)) {
940 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
945 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
951 error = ea_set_simple_noalloc(ip, bh, ea, es);
959 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
960 GFS2_SB(&ip->i_inode)->sd_jbsize);
962 error = ea_alloc_skeleton(ip, es->es_er, blks,
963 ea_set_simple_alloc, es);
971 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
974 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
975 struct buffer_head *indbh, *newbh;
978 int mh_size = sizeof(struct gfs2_meta_header);
980 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
983 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
988 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
993 eablk = (__be64 *)(indbh->b_data + mh_size);
994 end = eablk + sdp->sd_inptrs;
996 for (; eablk < end; eablk++)
1005 gfs2_trans_add_meta(ip->i_gl, indbh);
1009 error = gfs2_alloc_blocks(ip, &blk, &n, 0);
1012 gfs2_trans_remove_revoke(sdp, blk, 1);
1013 indbh = gfs2_meta_new(ip->i_gl, blk);
1014 gfs2_trans_add_meta(ip->i_gl, indbh);
1015 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1016 gfs2_buffer_clear_tail(indbh, mh_size);
1018 eablk = (__be64 *)(indbh->b_data + mh_size);
1019 *eablk = cpu_to_be64(ip->i_eattr);
1021 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1022 gfs2_add_inode_blocks(&ip->i_inode, 1);
1027 error = ea_alloc_blk(ip, &newbh);
1031 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1032 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1038 ea_set_remove_stuffed(ip, private);
1045 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1046 const void *value, size_t size, struct gfs2_ea_location *el)
1048 struct gfs2_ea_request er;
1050 unsigned int blks = 2;
1055 er.er_data = (void *)value;
1056 er.er_name_len = strlen(name);
1057 er.er_data_len = size;
1059 memset(&es, 0, sizeof(struct ea_set));
1063 error = ea_foreach(ip, ea_set_simple, &es);
1069 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1071 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1072 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1074 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1077 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1078 struct gfs2_ea_location *el)
1080 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1081 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1082 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1083 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1086 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1089 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1091 struct gfs2_ea_header *ea = el->el_ea;
1092 struct gfs2_ea_header *prev = el->el_prev;
1095 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1099 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1104 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1105 prev->ea_rec_len = cpu_to_be32(len);
1107 if (GFS2_EA_IS_LAST(ea))
1108 prev->ea_flags |= GFS2_EAFLAG_LAST;
1110 ea->ea_type = GFS2_EATYPE_UNUSED;
1113 inode_set_ctime_current(&ip->i_inode);
1114 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1116 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1122 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1124 * @type: The type of the extended attribute
1125 * @name: The name of the extended attribute
1127 * This is not called directly by the VFS since we use the (common)
1128 * scheme of making a "set with NULL data" mean a remove request. Note
1129 * that this is different from a set with zero length data.
1131 * Returns: 0, or errno on failure
1134 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1136 struct gfs2_ea_location el;
1142 error = gfs2_ea_find(ip, type, name, &el);
1148 if (GFS2_EA_IS_STUFFED(el.el_ea))
1149 error = ea_remove_stuffed(ip, &el);
1151 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1159 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1161 * @name: The name of the extended attribute
1162 * @value: The value of the extended attribute (NULL for remove)
1163 * @size: The size of the @value argument
1164 * @flags: Create or Replace
1165 * @type: The type of the extended attribute
1167 * See gfs2_xattr_remove() for details of the removal of xattrs.
1169 * Returns: 0 or errno on failure
1172 int __gfs2_xattr_set(struct inode *inode, const char *name,
1173 const void *value, size_t size, int flags, int type)
1175 struct gfs2_inode *ip = GFS2_I(inode);
1176 struct gfs2_sbd *sdp = GFS2_SB(inode);
1177 struct gfs2_ea_location el;
1178 unsigned int namel = strlen(name);
1181 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1183 if (namel > GFS2_EA_MAX_NAME_LEN)
1186 if (value == NULL) {
1187 error = gfs2_xattr_remove(ip, type, name);
1188 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1193 if (ea_check_size(sdp, namel, size))
1197 if (flags & XATTR_REPLACE)
1199 return ea_init(ip, type, name, value, size);
1202 error = gfs2_ea_find(ip, type, name, &el);
1207 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1213 if (!(flags & XATTR_CREATE)) {
1214 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1215 error = ea_set_i(ip, type, name, value, size, &el);
1216 if (!error && unstuffed)
1217 ea_set_remove_unstuffed(ip, &el);
1225 if (!(flags & XATTR_REPLACE))
1226 error = ea_set_i(ip, type, name, value, size, NULL);
1231 static int gfs2_xattr_set(const struct xattr_handler *handler,
1232 struct mnt_idmap *idmap,
1233 struct dentry *unused, struct inode *inode,
1234 const char *name, const void *value,
1235 size_t size, int flags)
1237 struct gfs2_inode *ip = GFS2_I(inode);
1238 struct gfs2_holder gh;
1241 ret = gfs2_qa_get(ip);
1245 /* May be called from gfs_setattr with the glock locked. */
1247 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1248 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1252 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) {
1256 gfs2_holder_mark_uninitialized(&gh);
1258 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1259 if (gfs2_holder_initialized(&gh))
1260 gfs2_glock_dq_uninit(&gh);
1266 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1268 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1269 struct gfs2_rgrp_list rlist;
1270 struct gfs2_rgrpd *rgd;
1271 struct buffer_head *indbh, *dibh;
1272 __be64 *eablk, *end;
1273 unsigned int rg_blocks = 0;
1275 unsigned int blen = 0;
1276 unsigned int blks = 0;
1280 error = gfs2_rindex_update(sdp);
1284 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1286 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1290 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1295 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1296 end = eablk + sdp->sd_inptrs;
1298 for (; eablk < end; eablk++) {
1303 bn = be64_to_cpu(*eablk);
1305 if (bstart + blen == bn)
1309 gfs2_rlist_add(ip, &rlist, bstart);
1316 gfs2_rlist_add(ip, &rlist, bstart);
1320 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE);
1322 for (x = 0; x < rlist.rl_rgrps; x++) {
1323 rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1324 rg_blocks += rgd->rd_length;
1327 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1329 goto out_rlist_free;
1331 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1332 RES_STATFS + RES_QUOTA, blks);
1336 gfs2_trans_add_meta(ip->i_gl, indbh);
1338 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1343 for (; eablk < end; eablk++) {
1348 bn = be64_to_cpu(*eablk);
1350 if (bstart + blen == bn)
1354 gfs2_free_meta(ip, rgd, bstart, blen);
1356 rgd = gfs2_blk2rgrpd(sdp, bstart, true);
1361 gfs2_add_inode_blocks(&ip->i_inode, -1);
1364 gfs2_free_meta(ip, rgd, bstart, blen);
1366 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1368 error = gfs2_meta_inode_buffer(ip, &dibh);
1370 gfs2_trans_add_meta(ip->i_gl, dibh);
1371 gfs2_dinode_out(ip, dibh->b_data);
1375 gfs2_trans_end(sdp);
1378 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1380 gfs2_rlist_free(&rlist);
1386 static int ea_dealloc_block(struct gfs2_inode *ip)
1388 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1389 struct gfs2_rgrpd *rgd;
1390 struct buffer_head *dibh;
1391 struct gfs2_holder gh;
1394 error = gfs2_rindex_update(sdp);
1398 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1400 gfs2_consist_inode(ip);
1404 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1405 LM_FLAG_NODE_SCOPE, &gh);
1409 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1414 gfs2_free_meta(ip, rgd, ip->i_eattr, 1);
1417 gfs2_add_inode_blocks(&ip->i_inode, -1);
1419 if (likely(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags))) {
1420 error = gfs2_meta_inode_buffer(ip, &dibh);
1422 gfs2_trans_add_meta(ip->i_gl, dibh);
1423 gfs2_dinode_out(ip, dibh->b_data);
1428 gfs2_trans_end(sdp);
1431 gfs2_glock_dq_uninit(&gh);
1436 * gfs2_ea_dealloc - deallocate the extended attribute fork
1442 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1446 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1450 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1454 if (likely(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags))) {
1455 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1459 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1460 error = ea_dealloc_indirect(ip);
1466 error = ea_dealloc_block(ip);
1469 gfs2_quota_unhold(ip);
1473 static const struct xattr_handler gfs2_xattr_user_handler = {
1474 .prefix = XATTR_USER_PREFIX,
1475 .flags = GFS2_EATYPE_USR,
1476 .get = gfs2_xattr_get,
1477 .set = gfs2_xattr_set,
1480 static const struct xattr_handler gfs2_xattr_security_handler = {
1481 .prefix = XATTR_SECURITY_PREFIX,
1482 .flags = GFS2_EATYPE_SECURITY,
1483 .get = gfs2_xattr_get,
1484 .set = gfs2_xattr_set,
1488 gfs2_xattr_trusted_list(struct dentry *dentry)
1490 return capable(CAP_SYS_ADMIN);
1493 static const struct xattr_handler gfs2_xattr_trusted_handler = {
1494 .prefix = XATTR_TRUSTED_PREFIX,
1495 .flags = GFS2_EATYPE_TRUSTED,
1496 .list = gfs2_xattr_trusted_list,
1497 .get = gfs2_xattr_get,
1498 .set = gfs2_xattr_set,
1501 const struct xattr_handler * const gfs2_xattr_handlers_max[] = {
1502 /* GFS2_FS_FORMAT_MAX */
1503 &gfs2_xattr_trusted_handler,
1505 /* GFS2_FS_FORMAT_MIN */
1506 &gfs2_xattr_user_handler,
1507 &gfs2_xattr_security_handler,
1511 const struct xattr_handler * const *gfs2_xattr_handlers_min = gfs2_xattr_handlers_max + 1;