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))
101 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
102 bh->b_data + bh->b_size))
104 if (!gfs2_eatype_valid(sdp, ea->ea_type))
106 error = ea_call(ip, bh, ea, prev, data);
110 if (GFS2_EA_IS_LAST(ea)) {
111 if ((char *)GFS2_EA2NEXT(ea) !=
112 bh->b_data + bh->b_size)
121 gfs2_consist_inode(ip);
125 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
127 struct buffer_head *bh, *eabh;
131 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
135 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
136 error = ea_foreach_i(ip, bh, ea_call, data);
140 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
145 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
146 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
148 for (; eablk < end; eablk++) {
153 bn = be64_to_cpu(*eablk);
155 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
158 error = ea_foreach_i(ip, eabh, ea_call, data);
172 struct gfs2_ea_location *ef_el;
175 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
176 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
179 struct ea_find *ef = private;
181 if (ea->ea_type == GFS2_EATYPE_UNUSED)
184 if (ea->ea_type == ef->type) {
185 if (ea->ea_name_len == ef->namel &&
186 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
187 struct gfs2_ea_location *el = ef->ef_el;
199 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
200 struct gfs2_ea_location *el)
207 ef.namel = strlen(name);
210 memset(el, 0, sizeof(struct gfs2_ea_location));
212 error = ea_foreach(ip, ea_find_i, &ef);
220 * ea_dealloc_unstuffed
222 * Take advantage of the fact that all unstuffed blocks are
223 * allocated from the same RG. But watch, this may not always
229 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
230 struct gfs2_ea_header *ea,
231 struct gfs2_ea_header *prev, void *private)
233 int *leave = private;
234 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
235 struct gfs2_rgrpd *rgd;
236 struct gfs2_holder rg_gh;
240 unsigned int blen = 0;
241 unsigned int blks = 0;
245 error = gfs2_rindex_update(sdp);
249 if (GFS2_EA_IS_STUFFED(ea))
252 dataptrs = GFS2_EA2DATAPTRS(ea);
253 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
256 bn = be64_to_cpu(*dataptrs);
262 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
264 gfs2_consist_inode(ip);
268 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
269 LM_FLAG_NODE_SCOPE, &rg_gh);
273 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
274 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
278 gfs2_trans_add_meta(ip->i_gl, bh);
280 dataptrs = GFS2_EA2DATAPTRS(ea);
281 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
284 bn = be64_to_cpu(*dataptrs);
286 if (bstart + blen == bn)
290 gfs2_free_meta(ip, rgd, bstart, blen);
296 gfs2_add_inode_blocks(&ip->i_inode, -1);
299 gfs2_free_meta(ip, rgd, bstart, blen);
301 if (prev && !leave) {
304 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
305 prev->ea_rec_len = cpu_to_be32(len);
307 if (GFS2_EA_IS_LAST(ea))
308 prev->ea_flags |= GFS2_EAFLAG_LAST;
310 ea->ea_type = GFS2_EATYPE_UNUSED;
314 ip->i_inode.i_ctime = current_time(&ip->i_inode);
315 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
320 gfs2_glock_dq_uninit(&rg_gh);
324 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
325 struct gfs2_ea_header *ea,
326 struct gfs2_ea_header *prev, int leave)
330 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
334 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
338 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
340 gfs2_quota_unhold(ip);
346 struct gfs2_ea_request *ei_er;
347 unsigned int ei_size;
350 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
351 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
354 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
355 struct ea_list *ei = private;
356 struct gfs2_ea_request *er = ei->ei_er;
357 unsigned int ea_size;
361 if (ea->ea_type == GFS2_EATYPE_UNUSED)
364 BUG_ON(ea->ea_type > GFS2_EATYPE_SECURITY &&
365 sdp->sd_sb.sb_fs_format == GFS2_FS_FORMAT_MIN);
366 switch (ea->ea_type) {
367 case GFS2_EATYPE_USR:
371 case GFS2_EATYPE_SYS:
375 case GFS2_EATYPE_SECURITY:
376 prefix = "security.";
379 case GFS2_EATYPE_TRUSTED:
387 ea_size = l + ea->ea_name_len + 1;
388 if (er->er_data_len) {
389 if (ei->ei_size + ea_size > er->er_data_len)
392 memcpy(er->er_data + ei->ei_size, prefix, l);
393 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
395 er->er_data[ei->ei_size + ea_size - 1] = 0;
398 ei->ei_size += ea_size;
404 * gfs2_listxattr - List gfs2 extended attributes
405 * @dentry: The dentry whose inode we are interested in
406 * @buffer: The buffer to write the results
407 * @size: The size of the buffer
409 * Returns: actual size of data on success, -errno on error
412 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
414 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
415 struct gfs2_ea_request er;
416 struct gfs2_holder i_gh;
419 memset(&er, 0, sizeof(struct gfs2_ea_request));
422 er.er_data_len = size;
425 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
430 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
432 error = ea_foreach(ip, ea_list_i, &ei);
437 gfs2_glock_dq_uninit(&i_gh);
443 * gfs2_iter_unstuffed - copies the unstuffed xattr data to/from the
445 * @ip: The GFS2 inode
446 * @ea: The extended attribute header structure
447 * @din: The data to be copied in
448 * @dout: The data to be copied out (one of din,dout will be NULL)
453 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
454 const char *din, char *dout)
456 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
457 struct buffer_head **bh;
458 unsigned int amount = GFS2_EA_DATA_LEN(ea);
459 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
460 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
466 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
470 for (x = 0; x < nptrs; x++) {
471 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
481 for (x = 0; x < nptrs; x++) {
482 error = gfs2_meta_wait(sdp, bh[x]);
484 for (; x < nptrs; x++)
488 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
489 for (; x < nptrs; x++)
495 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
496 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
499 memcpy(dout, pos, cp_size);
500 dout += sdp->sd_jbsize;
504 gfs2_trans_add_meta(ip->i_gl, bh[x]);
505 memcpy(pos, din, cp_size);
506 din += sdp->sd_jbsize;
509 amount -= sdp->sd_jbsize;
518 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
519 char *data, size_t size)
522 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
526 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
527 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
530 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
536 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
538 struct gfs2_ea_location el;
543 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
548 if (!GFS2_EA_DATA_LEN(el.el_ea))
551 len = GFS2_EA_DATA_LEN(el.el_ea);
552 data = kmalloc(len, GFP_NOFS);
557 error = gfs2_ea_get_copy(ip, &el, data, len);
568 * __gfs2_xattr_get - Get a GFS2 extended attribute
570 * @name: The name of the extended attribute
571 * @buffer: The buffer to write the result into
572 * @size: The size of the buffer
573 * @type: The type of extended attribute
575 * Returns: actual size of data on success, -errno on error
577 static int __gfs2_xattr_get(struct inode *inode, const char *name,
578 void *buffer, size_t size, int type)
580 struct gfs2_inode *ip = GFS2_I(inode);
581 struct gfs2_ea_location el;
586 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
589 error = gfs2_ea_find(ip, type, name, &el);
595 error = gfs2_ea_get_copy(ip, &el, buffer, size);
597 error = GFS2_EA_DATA_LEN(el.el_ea);
603 static int gfs2_xattr_get(const struct xattr_handler *handler,
604 struct dentry *unused, struct inode *inode,
605 const char *name, void *buffer, size_t size)
607 struct gfs2_inode *ip = GFS2_I(inode);
608 struct gfs2_holder gh;
611 /* During lookup, SELinux calls this function with the glock locked. */
613 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
614 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
618 gfs2_holder_mark_uninitialized(&gh);
620 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
621 if (gfs2_holder_initialized(&gh))
622 gfs2_glock_dq_uninit(&gh);
627 * ea_alloc_blk - allocates a new block for extended attributes.
628 * @ip: A pointer to the inode that's getting extended attributes
629 * @bhp: Pointer to pointer to a struct buffer_head
634 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
636 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
637 struct gfs2_ea_header *ea;
642 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
645 gfs2_trans_remove_revoke(sdp, block, 1);
646 *bhp = gfs2_meta_new(ip->i_gl, block);
647 gfs2_trans_add_meta(ip->i_gl, *bhp);
648 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
649 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
651 ea = GFS2_EA_BH2FIRST(*bhp);
652 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
653 ea->ea_type = GFS2_EATYPE_UNUSED;
654 ea->ea_flags = GFS2_EAFLAG_LAST;
657 gfs2_add_inode_blocks(&ip->i_inode, 1);
663 * ea_write - writes the request info to an ea, creating new blocks if
665 * @ip: inode that is being modified
666 * @ea: the location of the new ea in a block
667 * @er: the write request
669 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
674 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
675 struct gfs2_ea_request *er)
677 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
680 ea->ea_data_len = cpu_to_be32(er->er_data_len);
681 ea->ea_name_len = er->er_name_len;
682 ea->ea_type = er->er_type;
685 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
687 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
689 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
691 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
692 const char *data = er->er_data;
693 unsigned int data_len = er->er_data_len;
697 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
698 for (x = 0; x < ea->ea_num_ptrs; x++) {
699 struct buffer_head *bh;
701 int mh_size = sizeof(struct gfs2_meta_header);
704 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
707 gfs2_trans_remove_revoke(sdp, block, 1);
708 bh = gfs2_meta_new(ip->i_gl, block);
709 gfs2_trans_add_meta(ip->i_gl, bh);
710 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
712 gfs2_add_inode_blocks(&ip->i_inode, 1);
714 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
716 memcpy(bh->b_data + mh_size, data, copy);
717 if (copy < sdp->sd_jbsize)
718 memset(bh->b_data + mh_size + copy, 0,
719 sdp->sd_jbsize - copy);
721 *dataptr++ = cpu_to_be64(bh->b_blocknr);
728 gfs2_assert_withdraw(sdp, !data_len);
734 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
735 struct gfs2_ea_request *er, void *private);
737 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
739 ea_skeleton_call_t skeleton_call, void *private)
741 struct gfs2_alloc_parms ap = { .target = blks };
744 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
748 error = gfs2_quota_lock_check(ip, &ap);
752 error = gfs2_inplace_reserve(ip, &ap);
756 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
757 blks + gfs2_rg_blocks(ip, blks) +
758 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
762 error = skeleton_call(ip, er, private);
766 ip->i_inode.i_ctime = current_time(&ip->i_inode);
767 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
770 gfs2_trans_end(GFS2_SB(&ip->i_inode));
772 gfs2_inplace_release(ip);
774 gfs2_quota_unlock(ip);
778 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
781 struct buffer_head *bh;
784 error = ea_alloc_blk(ip, &bh);
788 ip->i_eattr = bh->b_blocknr;
789 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
797 * ea_init - initializes a new eattr block
801 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
802 const void *data, size_t size)
804 struct gfs2_ea_request er;
805 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
806 unsigned int blks = 1;
810 er.er_name_len = strlen(name);
811 er.er_data = (void *)data;
812 er.er_data_len = size;
814 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
815 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
817 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
820 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
822 u32 ea_size = GFS2_EA_SIZE(ea);
823 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
825 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
826 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
828 ea->ea_rec_len = cpu_to_be32(ea_size);
829 ea->ea_flags ^= last;
831 new->ea_rec_len = cpu_to_be32(new_size);
832 new->ea_flags = last;
837 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
838 struct gfs2_ea_location *el)
840 struct gfs2_ea_header *ea = el->el_ea;
841 struct gfs2_ea_header *prev = el->el_prev;
844 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
846 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
847 ea->ea_type = GFS2_EATYPE_UNUSED;
849 } else if (GFS2_EA2NEXT(prev) != ea) {
850 prev = GFS2_EA2NEXT(prev);
851 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
854 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
855 prev->ea_rec_len = cpu_to_be32(len);
857 if (GFS2_EA_IS_LAST(ea))
858 prev->ea_flags |= GFS2_EAFLAG_LAST;
864 struct gfs2_ea_request *es_er;
865 struct gfs2_ea_location *es_el;
867 struct buffer_head *es_bh;
868 struct gfs2_ea_header *es_ea;
871 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
872 struct gfs2_ea_header *ea, struct ea_set *es)
874 struct gfs2_ea_request *er = es->es_er;
877 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
881 gfs2_trans_add_meta(ip->i_gl, bh);
884 ea = ea_split_ea(ea);
886 ea_write(ip, ea, er);
889 ea_set_remove_stuffed(ip, es->es_el);
891 ip->i_inode.i_ctime = current_time(&ip->i_inode);
892 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
894 gfs2_trans_end(GFS2_SB(&ip->i_inode));
898 static int ea_set_simple_alloc(struct gfs2_inode *ip,
899 struct gfs2_ea_request *er, void *private)
901 struct ea_set *es = private;
902 struct gfs2_ea_header *ea = es->es_ea;
905 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
908 ea = ea_split_ea(ea);
910 error = ea_write(ip, ea, er);
915 ea_set_remove_stuffed(ip, es->es_el);
920 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
921 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
924 struct ea_set *es = private;
929 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
930 es->es_er->er_data_len, &size);
932 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
933 if (GFS2_EA_REC_LEN(ea) < size)
935 if (!GFS2_EA_IS_STUFFED(ea)) {
936 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
941 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
947 error = ea_set_simple_noalloc(ip, bh, ea, es);
955 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
956 GFS2_SB(&ip->i_inode)->sd_jbsize);
958 error = ea_alloc_skeleton(ip, es->es_er, blks,
959 ea_set_simple_alloc, es);
967 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
970 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
971 struct buffer_head *indbh, *newbh;
974 int mh_size = sizeof(struct gfs2_meta_header);
976 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
979 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
984 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
989 eablk = (__be64 *)(indbh->b_data + mh_size);
990 end = eablk + sdp->sd_inptrs;
992 for (; eablk < end; eablk++)
1001 gfs2_trans_add_meta(ip->i_gl, indbh);
1005 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1008 gfs2_trans_remove_revoke(sdp, blk, 1);
1009 indbh = gfs2_meta_new(ip->i_gl, blk);
1010 gfs2_trans_add_meta(ip->i_gl, indbh);
1011 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1012 gfs2_buffer_clear_tail(indbh, mh_size);
1014 eablk = (__be64 *)(indbh->b_data + mh_size);
1015 *eablk = cpu_to_be64(ip->i_eattr);
1017 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1018 gfs2_add_inode_blocks(&ip->i_inode, 1);
1023 error = ea_alloc_blk(ip, &newbh);
1027 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1028 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1034 ea_set_remove_stuffed(ip, private);
1041 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1042 const void *value, size_t size, struct gfs2_ea_location *el)
1044 struct gfs2_ea_request er;
1046 unsigned int blks = 2;
1051 er.er_data = (void *)value;
1052 er.er_name_len = strlen(name);
1053 er.er_data_len = size;
1055 memset(&es, 0, sizeof(struct ea_set));
1059 error = ea_foreach(ip, ea_set_simple, &es);
1065 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1067 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1068 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1070 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1073 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1074 struct gfs2_ea_location *el)
1076 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1077 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1078 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1079 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1082 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1085 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1087 struct gfs2_ea_header *ea = el->el_ea;
1088 struct gfs2_ea_header *prev = el->el_prev;
1091 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1095 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1100 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1101 prev->ea_rec_len = cpu_to_be32(len);
1103 if (GFS2_EA_IS_LAST(ea))
1104 prev->ea_flags |= GFS2_EAFLAG_LAST;
1106 ea->ea_type = GFS2_EATYPE_UNUSED;
1109 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1110 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1112 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1118 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1120 * @type: The type of the extended attribute
1121 * @name: The name of the extended attribute
1123 * This is not called directly by the VFS since we use the (common)
1124 * scheme of making a "set with NULL data" mean a remove request. Note
1125 * that this is different from a set with zero length data.
1127 * Returns: 0, or errno on failure
1130 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1132 struct gfs2_ea_location el;
1138 error = gfs2_ea_find(ip, type, name, &el);
1144 if (GFS2_EA_IS_STUFFED(el.el_ea))
1145 error = ea_remove_stuffed(ip, &el);
1147 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1155 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1157 * @name: The name of the extended attribute
1158 * @value: The value of the extended attribute (NULL for remove)
1159 * @size: The size of the @value argument
1160 * @flags: Create or Replace
1161 * @type: The type of the extended attribute
1163 * See gfs2_xattr_remove() for details of the removal of xattrs.
1165 * Returns: 0 or errno on failure
1168 int __gfs2_xattr_set(struct inode *inode, const char *name,
1169 const void *value, size_t size, int flags, int type)
1171 struct gfs2_inode *ip = GFS2_I(inode);
1172 struct gfs2_sbd *sdp = GFS2_SB(inode);
1173 struct gfs2_ea_location el;
1174 unsigned int namel = strlen(name);
1177 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1179 if (namel > GFS2_EA_MAX_NAME_LEN)
1182 if (value == NULL) {
1183 error = gfs2_xattr_remove(ip, type, name);
1184 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1189 if (ea_check_size(sdp, namel, size))
1193 if (flags & XATTR_REPLACE)
1195 return ea_init(ip, type, name, value, size);
1198 error = gfs2_ea_find(ip, type, name, &el);
1203 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1209 if (!(flags & XATTR_CREATE)) {
1210 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1211 error = ea_set_i(ip, type, name, value, size, &el);
1212 if (!error && unstuffed)
1213 ea_set_remove_unstuffed(ip, &el);
1221 if (!(flags & XATTR_REPLACE))
1222 error = ea_set_i(ip, type, name, value, size, NULL);
1227 static int gfs2_xattr_set(const struct xattr_handler *handler,
1228 struct user_namespace *mnt_userns,
1229 struct dentry *unused, struct inode *inode,
1230 const char *name, const void *value,
1231 size_t size, int flags)
1233 struct gfs2_inode *ip = GFS2_I(inode);
1234 struct gfs2_holder gh;
1237 ret = gfs2_qa_get(ip);
1241 /* May be called from gfs_setattr with the glock locked. */
1243 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1244 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1248 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) {
1252 gfs2_holder_mark_uninitialized(&gh);
1254 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1255 if (gfs2_holder_initialized(&gh))
1256 gfs2_glock_dq_uninit(&gh);
1262 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1264 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1265 struct gfs2_rgrp_list rlist;
1266 struct gfs2_rgrpd *rgd;
1267 struct buffer_head *indbh, *dibh;
1268 __be64 *eablk, *end;
1269 unsigned int rg_blocks = 0;
1271 unsigned int blen = 0;
1272 unsigned int blks = 0;
1276 error = gfs2_rindex_update(sdp);
1280 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1282 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1286 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1291 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1292 end = eablk + sdp->sd_inptrs;
1294 for (; eablk < end; eablk++) {
1299 bn = be64_to_cpu(*eablk);
1301 if (bstart + blen == bn)
1305 gfs2_rlist_add(ip, &rlist, bstart);
1312 gfs2_rlist_add(ip, &rlist, bstart);
1316 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE);
1318 for (x = 0; x < rlist.rl_rgrps; x++) {
1319 rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1320 rg_blocks += rgd->rd_length;
1323 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1325 goto out_rlist_free;
1327 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1328 RES_STATFS + RES_QUOTA, blks);
1332 gfs2_trans_add_meta(ip->i_gl, indbh);
1334 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1339 for (; eablk < end; eablk++) {
1344 bn = be64_to_cpu(*eablk);
1346 if (bstart + blen == bn)
1350 gfs2_free_meta(ip, rgd, bstart, blen);
1352 rgd = gfs2_blk2rgrpd(sdp, bstart, true);
1357 gfs2_add_inode_blocks(&ip->i_inode, -1);
1360 gfs2_free_meta(ip, rgd, bstart, blen);
1362 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1364 error = gfs2_meta_inode_buffer(ip, &dibh);
1366 gfs2_trans_add_meta(ip->i_gl, dibh);
1367 gfs2_dinode_out(ip, dibh->b_data);
1371 gfs2_trans_end(sdp);
1374 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1376 gfs2_rlist_free(&rlist);
1382 static int ea_dealloc_block(struct gfs2_inode *ip)
1384 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1385 struct gfs2_rgrpd *rgd;
1386 struct buffer_head *dibh;
1387 struct gfs2_holder gh;
1390 error = gfs2_rindex_update(sdp);
1394 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1396 gfs2_consist_inode(ip);
1400 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1401 LM_FLAG_NODE_SCOPE, &gh);
1405 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1410 gfs2_free_meta(ip, rgd, ip->i_eattr, 1);
1413 gfs2_add_inode_blocks(&ip->i_inode, -1);
1415 error = gfs2_meta_inode_buffer(ip, &dibh);
1417 gfs2_trans_add_meta(ip->i_gl, dibh);
1418 gfs2_dinode_out(ip, dibh->b_data);
1422 gfs2_trans_end(sdp);
1425 gfs2_glock_dq_uninit(&gh);
1430 * gfs2_ea_dealloc - deallocate the extended attribute fork
1436 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1440 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1444 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1448 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1452 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1453 error = ea_dealloc_indirect(ip);
1458 error = ea_dealloc_block(ip);
1461 gfs2_quota_unhold(ip);
1465 static const struct xattr_handler gfs2_xattr_user_handler = {
1466 .prefix = XATTR_USER_PREFIX,
1467 .flags = GFS2_EATYPE_USR,
1468 .get = gfs2_xattr_get,
1469 .set = gfs2_xattr_set,
1472 static const struct xattr_handler gfs2_xattr_security_handler = {
1473 .prefix = XATTR_SECURITY_PREFIX,
1474 .flags = GFS2_EATYPE_SECURITY,
1475 .get = gfs2_xattr_get,
1476 .set = gfs2_xattr_set,
1480 gfs2_xattr_trusted_list(struct dentry *dentry)
1482 return capable(CAP_SYS_ADMIN);
1485 static const struct xattr_handler gfs2_xattr_trusted_handler = {
1486 .prefix = XATTR_TRUSTED_PREFIX,
1487 .flags = GFS2_EATYPE_TRUSTED,
1488 .list = gfs2_xattr_trusted_list,
1489 .get = gfs2_xattr_get,
1490 .set = gfs2_xattr_set,
1493 const struct xattr_handler *gfs2_xattr_handlers_max[] = {
1494 /* GFS2_FS_FORMAT_MAX */
1495 &gfs2_xattr_trusted_handler,
1497 /* GFS2_FS_FORMAT_MIN */
1498 &gfs2_xattr_user_handler,
1499 &gfs2_xattr_security_handler,
1500 &posix_acl_access_xattr_handler,
1501 &posix_acl_default_xattr_handler,
1505 const struct xattr_handler **gfs2_xattr_handlers_min = gfs2_xattr_handlers_max + 1;