2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/xattr.h>
15 #include <linux/gfs2_ondisk.h>
16 #include <asm/uaccess.h>
31 * ea_calc_size - returns the acutal number of bytes the request will take up
32 * (not counting any unstuffed data blocks)
37 * Returns: 1 if the EA should be stuffed
40 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
43 unsigned int jbsize = sdp->sd_jbsize;
46 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
52 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
53 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
58 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
62 if (dsize > GFS2_EA_MAX_DATA_LEN)
65 ea_calc_size(sdp, nsize, dsize, &size);
67 /* This can only happen with 512 byte blocks */
68 if (size > sdp->sd_jbsize)
74 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
75 struct gfs2_ea_header *ea,
76 struct gfs2_ea_header *prev, void *private);
78 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
79 ea_call_t ea_call, void *data)
81 struct gfs2_ea_header *ea, *prev = NULL;
84 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
87 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
88 if (!GFS2_EA_REC_LEN(ea))
90 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
91 bh->b_data + bh->b_size))
93 if (!GFS2_EATYPE_VALID(ea->ea_type))
96 error = ea_call(ip, bh, ea, prev, data);
100 if (GFS2_EA_IS_LAST(ea)) {
101 if ((char *)GFS2_EA2NEXT(ea) !=
102 bh->b_data + bh->b_size)
111 gfs2_consist_inode(ip);
115 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
117 struct buffer_head *bh, *eabh;
121 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
125 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
126 error = ea_foreach_i(ip, bh, ea_call, data);
130 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
135 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
136 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
138 for (; eablk < end; eablk++) {
143 bn = be64_to_cpu(*eablk);
145 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
148 error = ea_foreach_i(ip, eabh, ea_call, data);
162 struct gfs2_ea_location *ef_el;
165 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
166 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
169 struct ea_find *ef = private;
171 if (ea->ea_type == GFS2_EATYPE_UNUSED)
174 if (ea->ea_type == ef->type) {
175 if (ea->ea_name_len == ef->namel &&
176 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
177 struct gfs2_ea_location *el = ef->ef_el;
189 int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
190 struct gfs2_ea_location *el)
197 ef.namel = strlen(name);
200 memset(el, 0, sizeof(struct gfs2_ea_location));
202 error = ea_foreach(ip, ea_find_i, &ef);
210 * ea_dealloc_unstuffed -
217 * Take advantage of the fact that all unstuffed blocks are
218 * allocated from the same RG. But watch, this may not always
224 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
225 struct gfs2_ea_header *ea,
226 struct gfs2_ea_header *prev, void *private)
228 int *leave = private;
229 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
230 struct gfs2_rgrpd *rgd;
231 struct gfs2_holder rg_gh;
232 struct buffer_head *dibh;
236 unsigned int blen = 0;
237 unsigned int blks = 0;
241 if (GFS2_EA_IS_STUFFED(ea))
244 dataptrs = GFS2_EA2DATAPTRS(ea);
245 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
248 bn = be64_to_cpu(*dataptrs);
254 rgd = gfs2_blk2rgrpd(sdp, bn);
256 gfs2_consist_inode(ip);
260 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
264 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
265 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
269 gfs2_trans_add_bh(ip->i_gl, bh, 1);
271 dataptrs = GFS2_EA2DATAPTRS(ea);
272 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
275 bn = be64_to_cpu(*dataptrs);
277 if (bstart + blen == bn)
281 gfs2_free_meta(ip, bstart, blen);
287 gfs2_add_inode_blocks(&ip->i_inode, -1);
290 gfs2_free_meta(ip, bstart, blen);
292 if (prev && !leave) {
295 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
296 prev->ea_rec_len = cpu_to_be32(len);
298 if (GFS2_EA_IS_LAST(ea))
299 prev->ea_flags |= GFS2_EAFLAG_LAST;
301 ea->ea_type = GFS2_EATYPE_UNUSED;
305 error = gfs2_meta_inode_buffer(ip, &dibh);
307 ip->i_inode.i_ctime = CURRENT_TIME;
308 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
309 gfs2_dinode_out(ip, dibh->b_data);
316 gfs2_glock_dq_uninit(&rg_gh);
320 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
321 struct gfs2_ea_header *ea,
322 struct gfs2_ea_header *prev, int leave)
324 struct gfs2_alloc *al;
327 al = gfs2_alloc_get(ip);
331 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
335 error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
339 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
341 gfs2_glock_dq_uninit(&al->al_ri_gh);
344 gfs2_quota_unhold(ip);
351 struct gfs2_ea_request *ei_er;
352 unsigned int ei_size;
355 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
357 switch (ea->ea_type) {
358 case GFS2_EATYPE_USR:
359 return 5 + ea->ea_name_len + 1;
360 case GFS2_EATYPE_SYS:
361 return 7 + ea->ea_name_len + 1;
362 case GFS2_EATYPE_SECURITY:
363 return 9 + ea->ea_name_len + 1;
369 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
370 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
373 struct ea_list *ei = private;
374 struct gfs2_ea_request *er = ei->ei_er;
375 unsigned int ea_size = gfs2_ea_strlen(ea);
377 if (ea->ea_type == GFS2_EATYPE_UNUSED)
380 if (er->er_data_len) {
385 if (ei->ei_size + ea_size > er->er_data_len)
388 switch (ea->ea_type) {
389 case GFS2_EATYPE_USR:
393 case GFS2_EATYPE_SYS:
397 case GFS2_EATYPE_SECURITY:
398 prefix = "security.";
405 memcpy(er->er_data + ei->ei_size, prefix, l);
406 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
408 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
411 ei->ei_size += ea_size;
417 * gfs2_listxattr - List gfs2 extended attributes
418 * @dentry: The dentry whose inode we are interested in
419 * @buffer: The buffer to write the results
420 * @size: The size of the buffer
422 * Returns: actual size of data on success, -errno on error
425 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
427 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
428 struct gfs2_ea_request er;
429 struct gfs2_holder i_gh;
432 memset(&er, 0, sizeof(struct gfs2_ea_request));
435 er.er_data_len = size;
438 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
443 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
445 error = ea_foreach(ip, ea_list_i, &ei);
450 gfs2_glock_dq_uninit(&i_gh);
456 * ea_get_unstuffed - actually copies the unstuffed data into the
458 * @ip: The GFS2 inode
459 * @ea: The extended attribute header structure
460 * @data: The data to be copied
465 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
468 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
469 struct buffer_head **bh;
470 unsigned int amount = GFS2_EA_DATA_LEN(ea);
471 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
472 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
476 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
480 for (x = 0; x < nptrs; x++) {
481 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
491 for (x = 0; x < nptrs; x++) {
492 error = gfs2_meta_wait(sdp, bh[x]);
494 for (; x < nptrs; x++)
498 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
499 for (; x < nptrs; x++)
505 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
506 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
508 amount -= sdp->sd_jbsize;
509 data += sdp->sd_jbsize;
519 int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
520 char *data, size_t size)
523 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
527 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
528 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
531 ret = ea_get_unstuffed(ip, el->el_ea, data);
538 * gfs2_xattr_get - Get a GFS2 extended attribute
540 * @type: The type of extended attribute
541 * @name: The name of the extended attribute
542 * @buffer: The buffer to write the result into
543 * @size: The size of the buffer
545 * Returns: actual size of data on success, -errno on error
548 int gfs2_xattr_get(struct inode *inode, int type, const char *name,
549 void *buffer, size_t size)
551 struct gfs2_inode *ip = GFS2_I(inode);
552 struct gfs2_ea_location el;
557 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
560 error = gfs2_ea_find(ip, type, name, &el);
566 error = gfs2_ea_get_copy(ip, &el, buffer, size);
568 error = GFS2_EA_DATA_LEN(el.el_ea);
575 * ea_alloc_blk - allocates a new block for extended attributes.
576 * @ip: A pointer to the inode that's getting extended attributes
577 * @bhp: Pointer to pointer to a struct buffer_head
582 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
584 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
585 struct gfs2_ea_header *ea;
590 error = gfs2_alloc_block(ip, &block, &n);
593 gfs2_trans_add_unrevoke(sdp, block, 1);
594 *bhp = gfs2_meta_new(ip->i_gl, block);
595 gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
596 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
597 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
599 ea = GFS2_EA_BH2FIRST(*bhp);
600 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
601 ea->ea_type = GFS2_EATYPE_UNUSED;
602 ea->ea_flags = GFS2_EAFLAG_LAST;
605 gfs2_add_inode_blocks(&ip->i_inode, 1);
611 * ea_write - writes the request info to an ea, creating new blocks if
613 * @ip: inode that is being modified
614 * @ea: the location of the new ea in a block
615 * @er: the write request
617 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
622 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
623 struct gfs2_ea_request *er)
625 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
628 ea->ea_data_len = cpu_to_be32(er->er_data_len);
629 ea->ea_name_len = er->er_name_len;
630 ea->ea_type = er->er_type;
633 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
635 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
637 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
639 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
640 const char *data = er->er_data;
641 unsigned int data_len = er->er_data_len;
645 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
646 for (x = 0; x < ea->ea_num_ptrs; x++) {
647 struct buffer_head *bh;
649 int mh_size = sizeof(struct gfs2_meta_header);
652 error = gfs2_alloc_block(ip, &block, &n);
655 gfs2_trans_add_unrevoke(sdp, block, 1);
656 bh = gfs2_meta_new(ip->i_gl, block);
657 gfs2_trans_add_bh(ip->i_gl, bh, 1);
658 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
660 gfs2_add_inode_blocks(&ip->i_inode, 1);
662 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
664 memcpy(bh->b_data + mh_size, data, copy);
665 if (copy < sdp->sd_jbsize)
666 memset(bh->b_data + mh_size + copy, 0,
667 sdp->sd_jbsize - copy);
669 *dataptr++ = cpu_to_be64(bh->b_blocknr);
676 gfs2_assert_withdraw(sdp, !data_len);
682 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
683 struct gfs2_ea_request *er, void *private);
685 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
687 ea_skeleton_call_t skeleton_call, void *private)
689 struct gfs2_alloc *al;
690 struct buffer_head *dibh;
693 al = gfs2_alloc_get(ip);
697 error = gfs2_quota_lock_check(ip);
701 al->al_requested = blks;
703 error = gfs2_inplace_reserve(ip);
707 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
708 blks + al->al_rgd->rd_length +
709 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
713 error = skeleton_call(ip, er, private);
717 error = gfs2_meta_inode_buffer(ip, &dibh);
719 ip->i_inode.i_ctime = CURRENT_TIME;
720 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
721 gfs2_dinode_out(ip, dibh->b_data);
726 gfs2_trans_end(GFS2_SB(&ip->i_inode));
728 gfs2_inplace_release(ip);
730 gfs2_quota_unlock(ip);
736 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
739 struct buffer_head *bh;
742 error = ea_alloc_blk(ip, &bh);
746 ip->i_eattr = bh->b_blocknr;
747 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
755 * ea_init - initializes a new eattr block
762 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
763 const void *data, size_t size)
765 struct gfs2_ea_request er;
766 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
767 unsigned int blks = 1;
771 er.er_name_len = strlen(name);
772 er.er_data = (void *)data;
773 er.er_data_len = size;
775 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
776 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
778 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
781 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
783 u32 ea_size = GFS2_EA_SIZE(ea);
784 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
786 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
787 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
789 ea->ea_rec_len = cpu_to_be32(ea_size);
790 ea->ea_flags ^= last;
792 new->ea_rec_len = cpu_to_be32(new_size);
793 new->ea_flags = last;
798 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
799 struct gfs2_ea_location *el)
801 struct gfs2_ea_header *ea = el->el_ea;
802 struct gfs2_ea_header *prev = el->el_prev;
805 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
807 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
808 ea->ea_type = GFS2_EATYPE_UNUSED;
810 } else if (GFS2_EA2NEXT(prev) != ea) {
811 prev = GFS2_EA2NEXT(prev);
812 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
815 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
816 prev->ea_rec_len = cpu_to_be32(len);
818 if (GFS2_EA_IS_LAST(ea))
819 prev->ea_flags |= GFS2_EAFLAG_LAST;
825 struct gfs2_ea_request *es_er;
826 struct gfs2_ea_location *es_el;
828 struct buffer_head *es_bh;
829 struct gfs2_ea_header *es_ea;
832 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
833 struct gfs2_ea_header *ea, struct ea_set *es)
835 struct gfs2_ea_request *er = es->es_er;
836 struct buffer_head *dibh;
839 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
843 gfs2_trans_add_bh(ip->i_gl, bh, 1);
846 ea = ea_split_ea(ea);
848 ea_write(ip, ea, er);
851 ea_set_remove_stuffed(ip, es->es_el);
853 error = gfs2_meta_inode_buffer(ip, &dibh);
856 ip->i_inode.i_ctime = CURRENT_TIME;
857 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
858 gfs2_dinode_out(ip, dibh->b_data);
861 gfs2_trans_end(GFS2_SB(&ip->i_inode));
865 static int ea_set_simple_alloc(struct gfs2_inode *ip,
866 struct gfs2_ea_request *er, void *private)
868 struct ea_set *es = private;
869 struct gfs2_ea_header *ea = es->es_ea;
872 gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
875 ea = ea_split_ea(ea);
877 error = ea_write(ip, ea, er);
882 ea_set_remove_stuffed(ip, es->es_el);
887 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
888 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
891 struct ea_set *es = private;
896 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
897 es->es_er->er_data_len, &size);
899 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
900 if (GFS2_EA_REC_LEN(ea) < size)
902 if (!GFS2_EA_IS_STUFFED(ea)) {
903 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
908 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
914 error = ea_set_simple_noalloc(ip, bh, ea, es);
922 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
923 GFS2_SB(&ip->i_inode)->sd_jbsize);
925 error = ea_alloc_skeleton(ip, es->es_er, blks,
926 ea_set_simple_alloc, es);
934 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
937 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
938 struct buffer_head *indbh, *newbh;
941 int mh_size = sizeof(struct gfs2_meta_header);
943 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
946 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
951 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
956 eablk = (__be64 *)(indbh->b_data + mh_size);
957 end = eablk + sdp->sd_inptrs;
959 for (; eablk < end; eablk++)
968 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
972 error = gfs2_alloc_block(ip, &blk, &n);
975 gfs2_trans_add_unrevoke(sdp, blk, 1);
976 indbh = gfs2_meta_new(ip->i_gl, blk);
977 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
978 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
979 gfs2_buffer_clear_tail(indbh, mh_size);
981 eablk = (__be64 *)(indbh->b_data + mh_size);
982 *eablk = cpu_to_be64(ip->i_eattr);
984 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
985 gfs2_add_inode_blocks(&ip->i_inode, 1);
990 error = ea_alloc_blk(ip, &newbh);
994 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
995 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1001 ea_set_remove_stuffed(ip, private);
1008 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1009 const void *value, size_t size, struct gfs2_ea_location *el)
1011 struct gfs2_ea_request er;
1013 unsigned int blks = 2;
1018 er.er_data = (void *)value;
1019 er.er_name_len = strlen(name);
1020 er.er_data_len = size;
1022 memset(&es, 0, sizeof(struct ea_set));
1026 error = ea_foreach(ip, ea_set_simple, &es);
1032 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1034 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1035 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1037 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1040 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1041 struct gfs2_ea_location *el)
1043 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1044 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1045 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1046 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1049 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1052 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1054 struct gfs2_ea_header *ea = el->el_ea;
1055 struct gfs2_ea_header *prev = el->el_prev;
1056 struct buffer_head *dibh;
1059 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1063 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1068 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1069 prev->ea_rec_len = cpu_to_be32(len);
1071 if (GFS2_EA_IS_LAST(ea))
1072 prev->ea_flags |= GFS2_EAFLAG_LAST;
1074 ea->ea_type = GFS2_EATYPE_UNUSED;
1077 error = gfs2_meta_inode_buffer(ip, &dibh);
1079 ip->i_inode.i_ctime = CURRENT_TIME;
1080 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1081 gfs2_dinode_out(ip, dibh->b_data);
1085 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1091 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1093 * @type: The type of the extended attribute
1094 * @name: The name of the extended attribute
1096 * This is not called directly by the VFS since we use the (common)
1097 * scheme of making a "set with NULL data" mean a remove request. Note
1098 * that this is different from a set with zero length data.
1100 * Returns: 0, or errno on failure
1103 static int gfs2_xattr_remove(struct inode *inode, int type, const char *name)
1105 struct gfs2_inode *ip = GFS2_I(inode);
1106 struct gfs2_ea_location el;
1112 error = gfs2_ea_find(ip, type, name, &el);
1118 if (GFS2_EA_IS_STUFFED(el.el_ea))
1119 error = ea_remove_stuffed(ip, &el);
1121 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1129 * gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1131 * @type: The type of the extended attribute
1132 * @name: The name of the extended attribute
1133 * @value: The value of the extended attribute (NULL for remove)
1134 * @size: The size of the @value argument
1135 * @flags: Create or Replace
1137 * See gfs2_xattr_remove() for details of the removal of xattrs.
1139 * Returns: 0 or errno on failure
1142 int gfs2_xattr_set(struct inode *inode, int type, const char *name,
1143 const void *value, size_t size, int flags)
1145 struct gfs2_sbd *sdp = GFS2_SB(inode);
1146 struct gfs2_inode *ip = GFS2_I(inode);
1147 struct gfs2_ea_location el;
1148 unsigned int namel = strlen(name);
1151 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1153 if (namel > GFS2_EA_MAX_NAME_LEN)
1157 return gfs2_xattr_remove(inode, type, name);
1159 if (ea_check_size(sdp, namel, size))
1163 if (flags & XATTR_REPLACE)
1165 return ea_init(ip, type, name, value, size);
1168 error = gfs2_ea_find(ip, type, name, &el);
1173 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1179 if (!(flags & XATTR_CREATE)) {
1180 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1181 error = ea_set_i(ip, type, name, value, size, &el);
1182 if (!error && unstuffed)
1183 ea_set_remove_unstuffed(ip, &el);
1191 if (!(flags & XATTR_REPLACE))
1192 error = ea_set_i(ip, type, name, value, size, NULL);
1197 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1198 struct gfs2_ea_header *ea, char *data)
1200 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1201 struct buffer_head **bh;
1202 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1203 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1204 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1208 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1212 error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1216 for (x = 0; x < nptrs; x++) {
1217 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1227 for (x = 0; x < nptrs; x++) {
1228 error = gfs2_meta_wait(sdp, bh[x]);
1230 for (; x < nptrs; x++)
1234 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1235 for (; x < nptrs; x++)
1241 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1243 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1244 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1246 amount -= sdp->sd_jbsize;
1247 data += sdp->sd_jbsize;
1257 gfs2_trans_end(sdp);
1262 int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
1263 struct iattr *attr, char *data)
1265 struct buffer_head *dibh;
1268 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
1269 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1273 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1274 memcpy(GFS2_EA2DATA(el->el_ea), data,
1275 GFS2_EA_DATA_LEN(el->el_ea));
1277 error = ea_acl_chmod_unstuffed(ip, el->el_ea, data);
1282 error = gfs2_meta_inode_buffer(ip, &dibh);
1284 error = inode_setattr(&ip->i_inode, attr);
1285 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1286 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1287 gfs2_dinode_out(ip, dibh->b_data);
1291 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1296 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1298 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1299 struct gfs2_rgrp_list rlist;
1300 struct buffer_head *indbh, *dibh;
1301 __be64 *eablk, *end;
1302 unsigned int rg_blocks = 0;
1304 unsigned int blen = 0;
1305 unsigned int blks = 0;
1309 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1311 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1315 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1320 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1321 end = eablk + sdp->sd_inptrs;
1323 for (; eablk < end; eablk++) {
1328 bn = be64_to_cpu(*eablk);
1330 if (bstart + blen == bn)
1334 gfs2_rlist_add(sdp, &rlist, bstart);
1341 gfs2_rlist_add(sdp, &rlist, bstart);
1345 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1347 for (x = 0; x < rlist.rl_rgrps; x++) {
1348 struct gfs2_rgrpd *rgd;
1349 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1350 rg_blocks += rgd->rd_length;
1353 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1355 goto out_rlist_free;
1357 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1358 RES_STATFS + RES_QUOTA, blks);
1362 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1364 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1368 for (; eablk < end; eablk++) {
1373 bn = be64_to_cpu(*eablk);
1375 if (bstart + blen == bn)
1379 gfs2_free_meta(ip, bstart, blen);
1385 gfs2_add_inode_blocks(&ip->i_inode, -1);
1388 gfs2_free_meta(ip, bstart, blen);
1390 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1392 error = gfs2_meta_inode_buffer(ip, &dibh);
1394 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1395 gfs2_dinode_out(ip, dibh->b_data);
1399 gfs2_trans_end(sdp);
1402 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1404 gfs2_rlist_free(&rlist);
1410 static int ea_dealloc_block(struct gfs2_inode *ip)
1412 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1413 struct gfs2_alloc *al = ip->i_alloc;
1414 struct gfs2_rgrpd *rgd;
1415 struct buffer_head *dibh;
1418 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1420 gfs2_consist_inode(ip);
1424 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1429 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1434 gfs2_free_meta(ip, ip->i_eattr, 1);
1437 gfs2_add_inode_blocks(&ip->i_inode, -1);
1439 error = gfs2_meta_inode_buffer(ip, &dibh);
1441 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1442 gfs2_dinode_out(ip, dibh->b_data);
1446 gfs2_trans_end(sdp);
1449 gfs2_glock_dq_uninit(&al->al_rgd_gh);
1454 * gfs2_ea_dealloc - deallocate the extended attribute fork
1460 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1462 struct gfs2_alloc *al;
1465 al = gfs2_alloc_get(ip);
1469 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1473 error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1477 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1481 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1482 error = ea_dealloc_indirect(ip);
1487 error = ea_dealloc_block(ip);
1490 gfs2_glock_dq_uninit(&al->al_ri_gh);
1492 gfs2_quota_unhold(ip);
1498 static int gfs2_xattr_user_get(struct inode *inode, const char *name,
1499 void *buffer, size_t size)
1501 return gfs2_xattr_get(inode, GFS2_EATYPE_USR, name, buffer, size);
1504 static int gfs2_xattr_user_set(struct inode *inode, const char *name,
1505 const void *value, size_t size, int flags)
1507 return gfs2_xattr_set(inode, GFS2_EATYPE_USR, name, value, size, flags);
1510 static int gfs2_xattr_system_get(struct inode *inode, const char *name,
1511 void *buffer, size_t size)
1513 return gfs2_xattr_get(inode, GFS2_EATYPE_SYS, name, buffer, size);
1516 static int gfs2_xattr_system_set(struct inode *inode, const char *name,
1517 const void *value, size_t size, int flags)
1519 return gfs2_xattr_set(inode, GFS2_EATYPE_SYS, name, value, size, flags);
1522 static int gfs2_xattr_security_get(struct inode *inode, const char *name,
1523 void *buffer, size_t size)
1525 return gfs2_xattr_get(inode, GFS2_EATYPE_SECURITY, name, buffer, size);
1528 static int gfs2_xattr_security_set(struct inode *inode, const char *name,
1529 const void *value, size_t size, int flags)
1531 return gfs2_xattr_set(inode, GFS2_EATYPE_SECURITY, name, value, size, flags);
1534 static struct xattr_handler gfs2_xattr_user_handler = {
1535 .prefix = XATTR_USER_PREFIX,
1536 .get = gfs2_xattr_user_get,
1537 .set = gfs2_xattr_user_set,
1540 static struct xattr_handler gfs2_xattr_security_handler = {
1541 .prefix = XATTR_SECURITY_PREFIX,
1542 .get = gfs2_xattr_security_get,
1543 .set = gfs2_xattr_security_set,
1546 static struct xattr_handler gfs2_xattr_system_handler = {
1547 .prefix = XATTR_SYSTEM_PREFIX,
1548 .get = gfs2_xattr_system_get,
1549 .set = gfs2_xattr_system_set,
1552 struct xattr_handler *gfs2_xattr_handlers[] = {
1553 &gfs2_xattr_user_handler,
1554 &gfs2_xattr_security_handler,
1555 &gfs2_xattr_system_handler,