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 static bool gfs2_eatype_valid(struct gfs2_sbd *sdp, u8 type)
75 switch(sdp->sd_sb.sb_fs_format) {
76 case GFS2_FS_FORMAT_MAX:
79 case GFS2_FS_FORMAT_MIN:
80 return type <= GFS2_EATYPE_SECURITY;
87 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
88 struct gfs2_ea_header *ea,
89 struct gfs2_ea_header *prev, void *private);
91 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
92 ea_call_t ea_call, void *data)
94 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
95 struct gfs2_ea_header *ea, *prev = NULL;
98 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
101 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
102 if (!GFS2_EA_REC_LEN(ea))
104 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
105 bh->b_data + bh->b_size))
107 if (!gfs2_eatype_valid(sdp, ea->ea_type))
109 error = ea_call(ip, bh, ea, prev, data);
113 if (GFS2_EA_IS_LAST(ea)) {
114 if ((char *)GFS2_EA2NEXT(ea) !=
115 bh->b_data + bh->b_size)
124 gfs2_consist_inode(ip);
128 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
130 struct buffer_head *bh, *eabh;
134 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
138 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
139 error = ea_foreach_i(ip, bh, ea_call, data);
143 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
148 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
149 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
151 for (; eablk < end; eablk++) {
156 bn = be64_to_cpu(*eablk);
158 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
161 error = ea_foreach_i(ip, eabh, ea_call, data);
175 struct gfs2_ea_location *ef_el;
178 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
179 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
182 struct ea_find *ef = private;
184 if (ea->ea_type == GFS2_EATYPE_UNUSED)
187 if (ea->ea_type == ef->type) {
188 if (ea->ea_name_len == ef->namel &&
189 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
190 struct gfs2_ea_location *el = ef->ef_el;
202 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
203 struct gfs2_ea_location *el)
210 ef.namel = strlen(name);
213 memset(el, 0, sizeof(struct gfs2_ea_location));
215 error = ea_foreach(ip, ea_find_i, &ef);
223 * ea_dealloc_unstuffed -
230 * Take advantage of the fact that all unstuffed blocks are
231 * allocated from the same RG. But watch, this may not always
237 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
238 struct gfs2_ea_header *ea,
239 struct gfs2_ea_header *prev, void *private)
241 int *leave = private;
242 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
243 struct gfs2_rgrpd *rgd;
244 struct gfs2_holder rg_gh;
248 unsigned int blen = 0;
249 unsigned int blks = 0;
253 error = gfs2_rindex_update(sdp);
257 if (GFS2_EA_IS_STUFFED(ea))
260 dataptrs = GFS2_EA2DATAPTRS(ea);
261 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
264 bn = be64_to_cpu(*dataptrs);
270 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
272 gfs2_consist_inode(ip);
276 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
277 LM_FLAG_NODE_SCOPE, &rg_gh);
281 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
282 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
286 gfs2_trans_add_meta(ip->i_gl, bh);
288 dataptrs = GFS2_EA2DATAPTRS(ea);
289 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
292 bn = be64_to_cpu(*dataptrs);
294 if (bstart + blen == bn)
298 gfs2_free_meta(ip, rgd, bstart, blen);
304 gfs2_add_inode_blocks(&ip->i_inode, -1);
307 gfs2_free_meta(ip, rgd, bstart, blen);
309 if (prev && !leave) {
312 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
313 prev->ea_rec_len = cpu_to_be32(len);
315 if (GFS2_EA_IS_LAST(ea))
316 prev->ea_flags |= GFS2_EAFLAG_LAST;
318 ea->ea_type = GFS2_EATYPE_UNUSED;
322 ip->i_inode.i_ctime = current_time(&ip->i_inode);
323 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
328 gfs2_glock_dq_uninit(&rg_gh);
332 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
333 struct gfs2_ea_header *ea,
334 struct gfs2_ea_header *prev, int leave)
338 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
342 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
346 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
348 gfs2_quota_unhold(ip);
354 struct gfs2_ea_request *ei_er;
355 unsigned int ei_size;
358 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
359 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
362 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
363 struct ea_list *ei = private;
364 struct gfs2_ea_request *er = ei->ei_er;
365 unsigned int ea_size;
369 if (ea->ea_type == GFS2_EATYPE_UNUSED)
372 BUG_ON(ea->ea_type > GFS2_EATYPE_SECURITY &&
373 sdp->sd_sb.sb_fs_format == GFS2_FS_FORMAT_MIN);
374 switch (ea->ea_type) {
375 case GFS2_EATYPE_USR:
379 case GFS2_EATYPE_SYS:
383 case GFS2_EATYPE_SECURITY:
384 prefix = "security.";
387 case GFS2_EATYPE_TRUSTED:
395 ea_size = l + ea->ea_name_len + 1;
396 if (er->er_data_len) {
397 if (ei->ei_size + ea_size > er->er_data_len)
400 memcpy(er->er_data + ei->ei_size, prefix, l);
401 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
403 er->er_data[ei->ei_size + ea_size - 1] = 0;
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(d_inode(dentry));
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, 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 inode *inode, const char *name,
586 void *buffer, size_t size, int type)
588 struct gfs2_inode *ip = GFS2_I(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);
611 static int gfs2_xattr_get(const struct xattr_handler *handler,
612 struct dentry *unused, struct inode *inode,
613 const char *name, void *buffer, size_t size)
615 struct gfs2_inode *ip = GFS2_I(inode);
616 struct gfs2_holder gh;
619 /* During lookup, SELinux calls this function with the glock locked. */
621 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
622 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
626 gfs2_holder_mark_uninitialized(&gh);
628 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
629 if (gfs2_holder_initialized(&gh))
630 gfs2_glock_dq_uninit(&gh);
635 * ea_alloc_blk - allocates a new block for extended attributes.
636 * @ip: A pointer to the inode that's getting extended attributes
637 * @bhp: Pointer to pointer to a struct buffer_head
642 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
644 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
645 struct gfs2_ea_header *ea;
650 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
653 gfs2_trans_remove_revoke(sdp, block, 1);
654 *bhp = gfs2_meta_new(ip->i_gl, block);
655 gfs2_trans_add_meta(ip->i_gl, *bhp);
656 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
657 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
659 ea = GFS2_EA_BH2FIRST(*bhp);
660 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
661 ea->ea_type = GFS2_EATYPE_UNUSED;
662 ea->ea_flags = GFS2_EAFLAG_LAST;
665 gfs2_add_inode_blocks(&ip->i_inode, 1);
671 * ea_write - writes the request info to an ea, creating new blocks if
673 * @ip: inode that is being modified
674 * @ea: the location of the new ea in a block
675 * @er: the write request
677 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
682 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
683 struct gfs2_ea_request *er)
685 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
688 ea->ea_data_len = cpu_to_be32(er->er_data_len);
689 ea->ea_name_len = er->er_name_len;
690 ea->ea_type = er->er_type;
693 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
695 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
697 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
699 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
700 const char *data = er->er_data;
701 unsigned int data_len = er->er_data_len;
705 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
706 for (x = 0; x < ea->ea_num_ptrs; x++) {
707 struct buffer_head *bh;
709 int mh_size = sizeof(struct gfs2_meta_header);
712 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
715 gfs2_trans_remove_revoke(sdp, block, 1);
716 bh = gfs2_meta_new(ip->i_gl, block);
717 gfs2_trans_add_meta(ip->i_gl, bh);
718 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
720 gfs2_add_inode_blocks(&ip->i_inode, 1);
722 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
724 memcpy(bh->b_data + mh_size, data, copy);
725 if (copy < sdp->sd_jbsize)
726 memset(bh->b_data + mh_size + copy, 0,
727 sdp->sd_jbsize - copy);
729 *dataptr++ = cpu_to_be64(bh->b_blocknr);
736 gfs2_assert_withdraw(sdp, !data_len);
742 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
743 struct gfs2_ea_request *er, void *private);
745 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
747 ea_skeleton_call_t skeleton_call, void *private)
749 struct gfs2_alloc_parms ap = { .target = blks };
752 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
756 error = gfs2_quota_lock_check(ip, &ap);
760 error = gfs2_inplace_reserve(ip, &ap);
764 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
765 blks + gfs2_rg_blocks(ip, blks) +
766 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
770 error = skeleton_call(ip, er, private);
774 ip->i_inode.i_ctime = current_time(&ip->i_inode);
775 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
778 gfs2_trans_end(GFS2_SB(&ip->i_inode));
780 gfs2_inplace_release(ip);
782 gfs2_quota_unlock(ip);
786 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
789 struct buffer_head *bh;
792 error = ea_alloc_blk(ip, &bh);
796 ip->i_eattr = bh->b_blocknr;
797 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
805 * ea_init - initializes a new eattr block
812 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
813 const void *data, size_t size)
815 struct gfs2_ea_request er;
816 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
817 unsigned int blks = 1;
821 er.er_name_len = strlen(name);
822 er.er_data = (void *)data;
823 er.er_data_len = size;
825 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
826 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
828 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
831 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
833 u32 ea_size = GFS2_EA_SIZE(ea);
834 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
836 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
837 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
839 ea->ea_rec_len = cpu_to_be32(ea_size);
840 ea->ea_flags ^= last;
842 new->ea_rec_len = cpu_to_be32(new_size);
843 new->ea_flags = last;
848 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
849 struct gfs2_ea_location *el)
851 struct gfs2_ea_header *ea = el->el_ea;
852 struct gfs2_ea_header *prev = el->el_prev;
855 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
857 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
858 ea->ea_type = GFS2_EATYPE_UNUSED;
860 } else if (GFS2_EA2NEXT(prev) != ea) {
861 prev = GFS2_EA2NEXT(prev);
862 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
865 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
866 prev->ea_rec_len = cpu_to_be32(len);
868 if (GFS2_EA_IS_LAST(ea))
869 prev->ea_flags |= GFS2_EAFLAG_LAST;
875 struct gfs2_ea_request *es_er;
876 struct gfs2_ea_location *es_el;
878 struct buffer_head *es_bh;
879 struct gfs2_ea_header *es_ea;
882 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
883 struct gfs2_ea_header *ea, struct ea_set *es)
885 struct gfs2_ea_request *er = es->es_er;
888 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
892 gfs2_trans_add_meta(ip->i_gl, bh);
895 ea = ea_split_ea(ea);
897 ea_write(ip, ea, er);
900 ea_set_remove_stuffed(ip, es->es_el);
902 ip->i_inode.i_ctime = current_time(&ip->i_inode);
903 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
905 gfs2_trans_end(GFS2_SB(&ip->i_inode));
909 static int ea_set_simple_alloc(struct gfs2_inode *ip,
910 struct gfs2_ea_request *er, void *private)
912 struct ea_set *es = private;
913 struct gfs2_ea_header *ea = es->es_ea;
916 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
919 ea = ea_split_ea(ea);
921 error = ea_write(ip, ea, er);
926 ea_set_remove_stuffed(ip, es->es_el);
931 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
932 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
935 struct ea_set *es = private;
940 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
941 es->es_er->er_data_len, &size);
943 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
944 if (GFS2_EA_REC_LEN(ea) < size)
946 if (!GFS2_EA_IS_STUFFED(ea)) {
947 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
952 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
958 error = ea_set_simple_noalloc(ip, bh, ea, es);
966 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
967 GFS2_SB(&ip->i_inode)->sd_jbsize);
969 error = ea_alloc_skeleton(ip, es->es_er, blks,
970 ea_set_simple_alloc, es);
978 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
981 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
982 struct buffer_head *indbh, *newbh;
985 int mh_size = sizeof(struct gfs2_meta_header);
987 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
990 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
995 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1000 eablk = (__be64 *)(indbh->b_data + mh_size);
1001 end = eablk + sdp->sd_inptrs;
1003 for (; eablk < end; eablk++)
1012 gfs2_trans_add_meta(ip->i_gl, indbh);
1016 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1019 gfs2_trans_remove_revoke(sdp, blk, 1);
1020 indbh = gfs2_meta_new(ip->i_gl, blk);
1021 gfs2_trans_add_meta(ip->i_gl, indbh);
1022 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1023 gfs2_buffer_clear_tail(indbh, mh_size);
1025 eablk = (__be64 *)(indbh->b_data + mh_size);
1026 *eablk = cpu_to_be64(ip->i_eattr);
1028 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1029 gfs2_add_inode_blocks(&ip->i_inode, 1);
1034 error = ea_alloc_blk(ip, &newbh);
1038 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1039 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1045 ea_set_remove_stuffed(ip, private);
1052 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1053 const void *value, size_t size, struct gfs2_ea_location *el)
1055 struct gfs2_ea_request er;
1057 unsigned int blks = 2;
1062 er.er_data = (void *)value;
1063 er.er_name_len = strlen(name);
1064 er.er_data_len = size;
1066 memset(&es, 0, sizeof(struct ea_set));
1070 error = ea_foreach(ip, ea_set_simple, &es);
1076 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1078 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1079 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1081 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1084 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1085 struct gfs2_ea_location *el)
1087 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1088 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1089 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1090 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1093 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1096 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1098 struct gfs2_ea_header *ea = el->el_ea;
1099 struct gfs2_ea_header *prev = el->el_prev;
1102 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1106 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1111 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1112 prev->ea_rec_len = cpu_to_be32(len);
1114 if (GFS2_EA_IS_LAST(ea))
1115 prev->ea_flags |= GFS2_EAFLAG_LAST;
1117 ea->ea_type = GFS2_EATYPE_UNUSED;
1120 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1121 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1123 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1129 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1131 * @type: The type of the extended attribute
1132 * @name: The name of the extended attribute
1134 * This is not called directly by the VFS since we use the (common)
1135 * scheme of making a "set with NULL data" mean a remove request. Note
1136 * that this is different from a set with zero length data.
1138 * Returns: 0, or errno on failure
1141 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1143 struct gfs2_ea_location el;
1149 error = gfs2_ea_find(ip, type, name, &el);
1155 if (GFS2_EA_IS_STUFFED(el.el_ea))
1156 error = ea_remove_stuffed(ip, &el);
1158 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1166 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1168 * @name: The name of the extended attribute
1169 * @value: The value of the extended attribute (NULL for remove)
1170 * @size: The size of the @value argument
1171 * @flags: Create or Replace
1172 * @type: The type of the extended attribute
1174 * See gfs2_xattr_remove() for details of the removal of xattrs.
1176 * Returns: 0 or errno on failure
1179 int __gfs2_xattr_set(struct inode *inode, const char *name,
1180 const void *value, size_t size, int flags, int type)
1182 struct gfs2_inode *ip = GFS2_I(inode);
1183 struct gfs2_sbd *sdp = GFS2_SB(inode);
1184 struct gfs2_ea_location el;
1185 unsigned int namel = strlen(name);
1188 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1190 if (namel > GFS2_EA_MAX_NAME_LEN)
1193 if (value == NULL) {
1194 error = gfs2_xattr_remove(ip, type, name);
1195 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1200 if (ea_check_size(sdp, namel, size))
1204 if (flags & XATTR_REPLACE)
1206 return ea_init(ip, type, name, value, size);
1209 error = gfs2_ea_find(ip, type, name, &el);
1214 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1220 if (!(flags & XATTR_CREATE)) {
1221 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1222 error = ea_set_i(ip, type, name, value, size, &el);
1223 if (!error && unstuffed)
1224 ea_set_remove_unstuffed(ip, &el);
1232 if (!(flags & XATTR_REPLACE))
1233 error = ea_set_i(ip, type, name, value, size, NULL);
1238 static int gfs2_xattr_set(const struct xattr_handler *handler,
1239 struct user_namespace *mnt_userns,
1240 struct dentry *unused, struct inode *inode,
1241 const char *name, const void *value,
1242 size_t size, int flags)
1244 struct gfs2_inode *ip = GFS2_I(inode);
1245 struct gfs2_holder gh;
1248 ret = gfs2_qa_get(ip);
1252 /* May be called from gfs_setattr with the glock locked. */
1254 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1255 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1259 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) {
1263 gfs2_holder_mark_uninitialized(&gh);
1265 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1266 if (gfs2_holder_initialized(&gh))
1267 gfs2_glock_dq_uninit(&gh);
1273 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1275 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1276 struct gfs2_rgrp_list rlist;
1277 struct gfs2_rgrpd *rgd;
1278 struct buffer_head *indbh, *dibh;
1279 __be64 *eablk, *end;
1280 unsigned int rg_blocks = 0;
1282 unsigned int blen = 0;
1283 unsigned int blks = 0;
1287 error = gfs2_rindex_update(sdp);
1291 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1293 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1297 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1302 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1303 end = eablk + sdp->sd_inptrs;
1305 for (; eablk < end; eablk++) {
1310 bn = be64_to_cpu(*eablk);
1312 if (bstart + blen == bn)
1316 gfs2_rlist_add(ip, &rlist, bstart);
1323 gfs2_rlist_add(ip, &rlist, bstart);
1327 gfs2_rlist_alloc(&rlist);
1329 for (x = 0; x < rlist.rl_rgrps; x++) {
1330 rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1331 rg_blocks += rgd->rd_length;
1334 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1336 goto out_rlist_free;
1338 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1339 RES_STATFS + RES_QUOTA, blks);
1343 gfs2_trans_add_meta(ip->i_gl, indbh);
1345 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1350 for (; eablk < end; eablk++) {
1355 bn = be64_to_cpu(*eablk);
1357 if (bstart + blen == bn)
1361 gfs2_free_meta(ip, rgd, bstart, blen);
1363 rgd = gfs2_blk2rgrpd(sdp, bstart, true);
1368 gfs2_add_inode_blocks(&ip->i_inode, -1);
1371 gfs2_free_meta(ip, rgd, bstart, blen);
1373 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1375 error = gfs2_meta_inode_buffer(ip, &dibh);
1377 gfs2_trans_add_meta(ip->i_gl, dibh);
1378 gfs2_dinode_out(ip, dibh->b_data);
1382 gfs2_trans_end(sdp);
1385 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1387 gfs2_rlist_free(&rlist);
1393 static int ea_dealloc_block(struct gfs2_inode *ip)
1395 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1396 struct gfs2_rgrpd *rgd;
1397 struct buffer_head *dibh;
1398 struct gfs2_holder gh;
1401 error = gfs2_rindex_update(sdp);
1405 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1407 gfs2_consist_inode(ip);
1411 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1412 LM_FLAG_NODE_SCOPE, &gh);
1416 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1421 gfs2_free_meta(ip, rgd, ip->i_eattr, 1);
1424 gfs2_add_inode_blocks(&ip->i_inode, -1);
1426 error = gfs2_meta_inode_buffer(ip, &dibh);
1428 gfs2_trans_add_meta(ip->i_gl, dibh);
1429 gfs2_dinode_out(ip, dibh->b_data);
1433 gfs2_trans_end(sdp);
1436 gfs2_glock_dq_uninit(&gh);
1441 * gfs2_ea_dealloc - deallocate the extended attribute fork
1447 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1451 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1455 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1459 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1463 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1464 error = ea_dealloc_indirect(ip);
1469 error = ea_dealloc_block(ip);
1472 gfs2_quota_unhold(ip);
1476 static const struct xattr_handler gfs2_xattr_user_handler = {
1477 .prefix = XATTR_USER_PREFIX,
1478 .flags = GFS2_EATYPE_USR,
1479 .get = gfs2_xattr_get,
1480 .set = gfs2_xattr_set,
1483 static const struct xattr_handler gfs2_xattr_security_handler = {
1484 .prefix = XATTR_SECURITY_PREFIX,
1485 .flags = GFS2_EATYPE_SECURITY,
1486 .get = gfs2_xattr_get,
1487 .set = gfs2_xattr_set,
1491 gfs2_xattr_trusted_list(struct dentry *dentry)
1493 return capable(CAP_SYS_ADMIN);
1496 static const struct xattr_handler gfs2_xattr_trusted_handler = {
1497 .prefix = XATTR_TRUSTED_PREFIX,
1498 .flags = GFS2_EATYPE_TRUSTED,
1499 .list = gfs2_xattr_trusted_list,
1500 .get = gfs2_xattr_get,
1501 .set = gfs2_xattr_set,
1504 const struct xattr_handler *gfs2_xattr_handlers_max[] = {
1505 /* GFS2_FS_FORMAT_MAX */
1506 &gfs2_xattr_trusted_handler,
1508 /* GFS2_FS_FORMAT_MIN */
1509 &gfs2_xattr_user_handler,
1510 &gfs2_xattr_security_handler,
1511 &posix_acl_access_xattr_handler,
1512 &posix_acl_default_xattr_handler,
1516 const struct xattr_handler **gfs2_xattr_handlers_min = gfs2_xattr_handlers_max + 1;