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 static 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 error = gfs2_rindex_update(sdp);
245 if (GFS2_EA_IS_STUFFED(ea))
248 dataptrs = GFS2_EA2DATAPTRS(ea);
249 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
252 bn = be64_to_cpu(*dataptrs);
258 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
260 gfs2_consist_inode(ip);
264 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
268 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
269 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
273 gfs2_trans_add_bh(ip->i_gl, bh, 1);
275 dataptrs = GFS2_EA2DATAPTRS(ea);
276 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
279 bn = be64_to_cpu(*dataptrs);
281 if (bstart + blen == bn)
285 gfs2_free_meta(ip, bstart, blen);
291 gfs2_add_inode_blocks(&ip->i_inode, -1);
294 gfs2_free_meta(ip, bstart, blen);
296 if (prev && !leave) {
299 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
300 prev->ea_rec_len = cpu_to_be32(len);
302 if (GFS2_EA_IS_LAST(ea))
303 prev->ea_flags |= GFS2_EAFLAG_LAST;
305 ea->ea_type = GFS2_EATYPE_UNUSED;
309 error = gfs2_meta_inode_buffer(ip, &dibh);
311 ip->i_inode.i_ctime = CURRENT_TIME;
312 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
313 gfs2_dinode_out(ip, dibh->b_data);
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)
328 struct gfs2_qadata *qa;
331 qa = gfs2_qadata_get(ip);
335 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
339 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
341 gfs2_quota_unhold(ip);
348 struct gfs2_ea_request *ei_er;
349 unsigned int ei_size;
352 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
354 switch (ea->ea_type) {
355 case GFS2_EATYPE_USR:
356 return 5 + ea->ea_name_len + 1;
357 case GFS2_EATYPE_SYS:
358 return 7 + ea->ea_name_len + 1;
359 case GFS2_EATYPE_SECURITY:
360 return 9 + ea->ea_name_len + 1;
366 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
367 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
370 struct ea_list *ei = private;
371 struct gfs2_ea_request *er = ei->ei_er;
372 unsigned int ea_size = gfs2_ea_strlen(ea);
374 if (ea->ea_type == GFS2_EATYPE_UNUSED)
377 if (er->er_data_len) {
382 if (ei->ei_size + ea_size > er->er_data_len)
385 switch (ea->ea_type) {
386 case GFS2_EATYPE_USR:
390 case GFS2_EATYPE_SYS:
394 case GFS2_EATYPE_SECURITY:
395 prefix = "security.";
402 memcpy(er->er_data + ei->ei_size, prefix, l);
403 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
405 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
408 ei->ei_size += ea_size;
414 * gfs2_listxattr - List gfs2 extended attributes
415 * @dentry: The dentry whose inode we are interested in
416 * @buffer: The buffer to write the results
417 * @size: The size of the buffer
419 * Returns: actual size of data on success, -errno on error
422 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
424 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
425 struct gfs2_ea_request er;
426 struct gfs2_holder i_gh;
429 memset(&er, 0, sizeof(struct gfs2_ea_request));
432 er.er_data_len = size;
435 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
440 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
442 error = ea_foreach(ip, ea_list_i, &ei);
447 gfs2_glock_dq_uninit(&i_gh);
453 * ea_get_unstuffed - actually copies the unstuffed data into the
455 * @ip: The GFS2 inode
456 * @ea: The extended attribute header structure
457 * @data: The data to be copied
462 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
465 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
466 struct buffer_head **bh;
467 unsigned int amount = GFS2_EA_DATA_LEN(ea);
468 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
469 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
473 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
477 for (x = 0; x < nptrs; x++) {
478 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
488 for (x = 0; x < nptrs; x++) {
489 error = gfs2_meta_wait(sdp, bh[x]);
491 for (; x < nptrs; x++)
495 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
496 for (; x < nptrs; x++)
502 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
503 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
505 amount -= sdp->sd_jbsize;
506 data += sdp->sd_jbsize;
516 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
517 char *data, size_t size)
520 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
524 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
525 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
528 ret = ea_get_unstuffed(ip, el->el_ea, data);
534 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
536 struct gfs2_ea_location el;
541 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
546 if (!GFS2_EA_DATA_LEN(el.el_ea))
549 len = GFS2_EA_DATA_LEN(el.el_ea);
550 data = kmalloc(len, GFP_NOFS);
555 error = gfs2_ea_get_copy(ip, &el, data, len);
566 * gfs2_xattr_get - Get a GFS2 extended attribute
568 * @name: The name of the extended attribute
569 * @buffer: The buffer to write the result into
570 * @size: The size of the buffer
571 * @type: The type of extended attribute
573 * Returns: actual size of data on success, -errno on error
575 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
576 void *buffer, size_t size, int type)
578 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
579 struct gfs2_ea_location el;
584 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
587 error = gfs2_ea_find(ip, type, name, &el);
593 error = gfs2_ea_get_copy(ip, &el, buffer, size);
595 error = GFS2_EA_DATA_LEN(el.el_ea);
602 * ea_alloc_blk - allocates a new block for extended attributes.
603 * @ip: A pointer to the inode that's getting extended attributes
604 * @bhp: Pointer to pointer to a struct buffer_head
609 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
611 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
612 struct gfs2_ea_header *ea;
617 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
620 gfs2_trans_add_unrevoke(sdp, block, 1);
621 *bhp = gfs2_meta_new(ip->i_gl, block);
622 gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
623 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
624 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
626 ea = GFS2_EA_BH2FIRST(*bhp);
627 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
628 ea->ea_type = GFS2_EATYPE_UNUSED;
629 ea->ea_flags = GFS2_EAFLAG_LAST;
632 gfs2_add_inode_blocks(&ip->i_inode, 1);
638 * ea_write - writes the request info to an ea, creating new blocks if
640 * @ip: inode that is being modified
641 * @ea: the location of the new ea in a block
642 * @er: the write request
644 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
649 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
650 struct gfs2_ea_request *er)
652 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
655 ea->ea_data_len = cpu_to_be32(er->er_data_len);
656 ea->ea_name_len = er->er_name_len;
657 ea->ea_type = er->er_type;
660 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
662 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
664 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
666 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
667 const char *data = er->er_data;
668 unsigned int data_len = er->er_data_len;
672 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
673 for (x = 0; x < ea->ea_num_ptrs; x++) {
674 struct buffer_head *bh;
676 int mh_size = sizeof(struct gfs2_meta_header);
679 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
682 gfs2_trans_add_unrevoke(sdp, block, 1);
683 bh = gfs2_meta_new(ip->i_gl, block);
684 gfs2_trans_add_bh(ip->i_gl, bh, 1);
685 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
687 gfs2_add_inode_blocks(&ip->i_inode, 1);
689 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
691 memcpy(bh->b_data + mh_size, data, copy);
692 if (copy < sdp->sd_jbsize)
693 memset(bh->b_data + mh_size + copy, 0,
694 sdp->sd_jbsize - copy);
696 *dataptr++ = cpu_to_be64(bh->b_blocknr);
703 gfs2_assert_withdraw(sdp, !data_len);
709 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
710 struct gfs2_ea_request *er, void *private);
712 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
714 ea_skeleton_call_t skeleton_call, void *private)
716 struct gfs2_qadata *qa;
717 struct buffer_head *dibh;
720 qa = gfs2_qadata_get(ip);
724 error = gfs2_quota_lock_check(ip);
728 error = gfs2_inplace_reserve(ip, blks);
732 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
733 blks + gfs2_rg_blocks(ip) +
734 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
738 error = skeleton_call(ip, er, private);
742 error = gfs2_meta_inode_buffer(ip, &dibh);
744 ip->i_inode.i_ctime = CURRENT_TIME;
745 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
746 gfs2_dinode_out(ip, dibh->b_data);
751 gfs2_trans_end(GFS2_SB(&ip->i_inode));
753 gfs2_inplace_release(ip);
755 gfs2_quota_unlock(ip);
761 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
764 struct buffer_head *bh;
767 error = ea_alloc_blk(ip, &bh);
771 ip->i_eattr = bh->b_blocknr;
772 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
780 * ea_init - initializes a new eattr block
787 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
788 const void *data, size_t size)
790 struct gfs2_ea_request er;
791 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
792 unsigned int blks = 1;
796 er.er_name_len = strlen(name);
797 er.er_data = (void *)data;
798 er.er_data_len = size;
800 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
801 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
803 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
806 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
808 u32 ea_size = GFS2_EA_SIZE(ea);
809 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
811 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
812 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
814 ea->ea_rec_len = cpu_to_be32(ea_size);
815 ea->ea_flags ^= last;
817 new->ea_rec_len = cpu_to_be32(new_size);
818 new->ea_flags = last;
823 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
824 struct gfs2_ea_location *el)
826 struct gfs2_ea_header *ea = el->el_ea;
827 struct gfs2_ea_header *prev = el->el_prev;
830 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
832 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
833 ea->ea_type = GFS2_EATYPE_UNUSED;
835 } else if (GFS2_EA2NEXT(prev) != ea) {
836 prev = GFS2_EA2NEXT(prev);
837 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
840 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
841 prev->ea_rec_len = cpu_to_be32(len);
843 if (GFS2_EA_IS_LAST(ea))
844 prev->ea_flags |= GFS2_EAFLAG_LAST;
850 struct gfs2_ea_request *es_er;
851 struct gfs2_ea_location *es_el;
853 struct buffer_head *es_bh;
854 struct gfs2_ea_header *es_ea;
857 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
858 struct gfs2_ea_header *ea, struct ea_set *es)
860 struct gfs2_ea_request *er = es->es_er;
861 struct buffer_head *dibh;
864 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
868 gfs2_trans_add_bh(ip->i_gl, bh, 1);
871 ea = ea_split_ea(ea);
873 ea_write(ip, ea, er);
876 ea_set_remove_stuffed(ip, es->es_el);
878 error = gfs2_meta_inode_buffer(ip, &dibh);
881 ip->i_inode.i_ctime = CURRENT_TIME;
882 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
883 gfs2_dinode_out(ip, dibh->b_data);
886 gfs2_trans_end(GFS2_SB(&ip->i_inode));
890 static int ea_set_simple_alloc(struct gfs2_inode *ip,
891 struct gfs2_ea_request *er, void *private)
893 struct ea_set *es = private;
894 struct gfs2_ea_header *ea = es->es_ea;
897 gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
900 ea = ea_split_ea(ea);
902 error = ea_write(ip, ea, er);
907 ea_set_remove_stuffed(ip, es->es_el);
912 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
913 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
916 struct ea_set *es = private;
921 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
922 es->es_er->er_data_len, &size);
924 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
925 if (GFS2_EA_REC_LEN(ea) < size)
927 if (!GFS2_EA_IS_STUFFED(ea)) {
928 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
933 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
939 error = ea_set_simple_noalloc(ip, bh, ea, es);
947 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
948 GFS2_SB(&ip->i_inode)->sd_jbsize);
950 error = ea_alloc_skeleton(ip, es->es_er, blks,
951 ea_set_simple_alloc, es);
959 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
962 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
963 struct buffer_head *indbh, *newbh;
966 int mh_size = sizeof(struct gfs2_meta_header);
968 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
971 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
976 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
981 eablk = (__be64 *)(indbh->b_data + mh_size);
982 end = eablk + sdp->sd_inptrs;
984 for (; eablk < end; eablk++)
993 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
997 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1000 gfs2_trans_add_unrevoke(sdp, blk, 1);
1001 indbh = gfs2_meta_new(ip->i_gl, blk);
1002 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1003 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1004 gfs2_buffer_clear_tail(indbh, mh_size);
1006 eablk = (__be64 *)(indbh->b_data + mh_size);
1007 *eablk = cpu_to_be64(ip->i_eattr);
1009 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1010 gfs2_add_inode_blocks(&ip->i_inode, 1);
1015 error = ea_alloc_blk(ip, &newbh);
1019 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1020 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1026 ea_set_remove_stuffed(ip, private);
1033 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1034 const void *value, size_t size, struct gfs2_ea_location *el)
1036 struct gfs2_ea_request er;
1038 unsigned int blks = 2;
1043 er.er_data = (void *)value;
1044 er.er_name_len = strlen(name);
1045 er.er_data_len = size;
1047 memset(&es, 0, sizeof(struct ea_set));
1051 error = ea_foreach(ip, ea_set_simple, &es);
1057 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1059 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1060 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1062 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1065 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1066 struct gfs2_ea_location *el)
1068 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1069 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1070 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1071 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1074 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1077 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1079 struct gfs2_ea_header *ea = el->el_ea;
1080 struct gfs2_ea_header *prev = el->el_prev;
1081 struct buffer_head *dibh;
1084 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1088 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1093 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1094 prev->ea_rec_len = cpu_to_be32(len);
1096 if (GFS2_EA_IS_LAST(ea))
1097 prev->ea_flags |= GFS2_EAFLAG_LAST;
1099 ea->ea_type = GFS2_EATYPE_UNUSED;
1102 error = gfs2_meta_inode_buffer(ip, &dibh);
1104 ip->i_inode.i_ctime = CURRENT_TIME;
1105 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1106 gfs2_dinode_out(ip, dibh->b_data);
1110 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1116 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1118 * @type: The type of the extended attribute
1119 * @name: The name of the extended attribute
1121 * This is not called directly by the VFS since we use the (common)
1122 * scheme of making a "set with NULL data" mean a remove request. Note
1123 * that this is different from a set with zero length data.
1125 * Returns: 0, or errno on failure
1128 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1130 struct gfs2_ea_location el;
1136 error = gfs2_ea_find(ip, type, name, &el);
1142 if (GFS2_EA_IS_STUFFED(el.el_ea))
1143 error = ea_remove_stuffed(ip, &el);
1145 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1153 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1155 * @name: The name of the extended attribute
1156 * @value: The value of the extended attribute (NULL for remove)
1157 * @size: The size of the @value argument
1158 * @flags: Create or Replace
1159 * @type: The type of the extended attribute
1161 * See gfs2_xattr_remove() for details of the removal of xattrs.
1163 * Returns: 0 or errno on failure
1166 int __gfs2_xattr_set(struct inode *inode, const char *name,
1167 const void *value, size_t size, int flags, int type)
1169 struct gfs2_inode *ip = GFS2_I(inode);
1170 struct gfs2_sbd *sdp = GFS2_SB(inode);
1171 struct gfs2_ea_location el;
1172 unsigned int namel = strlen(name);
1175 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1177 if (namel > GFS2_EA_MAX_NAME_LEN)
1181 return gfs2_xattr_remove(ip, type, name);
1183 if (ea_check_size(sdp, namel, size))
1187 if (flags & XATTR_REPLACE)
1189 return ea_init(ip, type, name, value, size);
1192 error = gfs2_ea_find(ip, type, name, &el);
1197 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1203 if (!(flags & XATTR_CREATE)) {
1204 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1205 error = ea_set_i(ip, type, name, value, size, &el);
1206 if (!error && unstuffed)
1207 ea_set_remove_unstuffed(ip, &el);
1215 if (!(flags & XATTR_REPLACE))
1216 error = ea_set_i(ip, type, name, value, size, NULL);
1221 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1222 const void *value, size_t size, int flags, int type)
1224 return __gfs2_xattr_set(dentry->d_inode, name, value,
1228 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1229 struct gfs2_ea_header *ea, char *data)
1231 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1232 struct buffer_head **bh;
1233 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1234 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1235 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1239 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1243 error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1247 for (x = 0; x < nptrs; x++) {
1248 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1258 for (x = 0; x < nptrs; x++) {
1259 error = gfs2_meta_wait(sdp, bh[x]);
1261 for (; x < nptrs; x++)
1265 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1266 for (; x < nptrs; x++)
1272 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1274 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1275 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1277 amount -= sdp->sd_jbsize;
1278 data += sdp->sd_jbsize;
1288 gfs2_trans_end(sdp);
1293 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1295 struct inode *inode = &ip->i_inode;
1296 struct gfs2_sbd *sdp = GFS2_SB(inode);
1297 struct gfs2_ea_location el;
1300 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1304 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1305 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1307 gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1308 memcpy(GFS2_EA2DATA(el.el_ea), data,
1309 GFS2_EA_DATA_LEN(el.el_ea));
1312 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1319 error = gfs2_setattr_simple(inode, attr);
1320 gfs2_trans_end(sdp);
1324 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1326 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1327 struct gfs2_rgrp_list rlist;
1328 struct buffer_head *indbh, *dibh;
1329 __be64 *eablk, *end;
1330 unsigned int rg_blocks = 0;
1332 unsigned int blen = 0;
1333 unsigned int blks = 0;
1337 error = gfs2_rindex_update(sdp);
1341 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1343 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1347 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1352 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1353 end = eablk + sdp->sd_inptrs;
1355 for (; eablk < end; eablk++) {
1360 bn = be64_to_cpu(*eablk);
1362 if (bstart + blen == bn)
1366 gfs2_rlist_add(ip, &rlist, bstart);
1373 gfs2_rlist_add(ip, &rlist, bstart);
1377 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1379 for (x = 0; x < rlist.rl_rgrps; x++) {
1380 struct gfs2_rgrpd *rgd;
1381 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1382 rg_blocks += rgd->rd_length;
1385 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1387 goto out_rlist_free;
1389 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1390 RES_STATFS + RES_QUOTA, blks);
1394 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1396 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1400 for (; eablk < end; eablk++) {
1405 bn = be64_to_cpu(*eablk);
1407 if (bstart + blen == bn)
1411 gfs2_free_meta(ip, bstart, blen);
1417 gfs2_add_inode_blocks(&ip->i_inode, -1);
1420 gfs2_free_meta(ip, bstart, blen);
1422 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1424 error = gfs2_meta_inode_buffer(ip, &dibh);
1426 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1427 gfs2_dinode_out(ip, dibh->b_data);
1431 gfs2_trans_end(sdp);
1434 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1436 gfs2_rlist_free(&rlist);
1442 static int ea_dealloc_block(struct gfs2_inode *ip)
1444 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1445 struct gfs2_rgrpd *rgd;
1446 struct buffer_head *dibh;
1447 struct gfs2_holder gh;
1450 error = gfs2_rindex_update(sdp);
1454 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1456 gfs2_consist_inode(ip);
1460 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1464 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1469 gfs2_free_meta(ip, ip->i_eattr, 1);
1472 gfs2_add_inode_blocks(&ip->i_inode, -1);
1474 error = gfs2_meta_inode_buffer(ip, &dibh);
1476 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1477 gfs2_dinode_out(ip, dibh->b_data);
1481 gfs2_trans_end(sdp);
1484 gfs2_glock_dq_uninit(&gh);
1489 * gfs2_ea_dealloc - deallocate the extended attribute fork
1495 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1497 struct gfs2_qadata *qa;
1500 qa = gfs2_qadata_get(ip);
1504 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1508 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1512 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1513 error = ea_dealloc_indirect(ip);
1518 error = ea_dealloc_block(ip);
1521 gfs2_quota_unhold(ip);
1523 gfs2_qadata_put(ip);
1527 static const struct xattr_handler gfs2_xattr_user_handler = {
1528 .prefix = XATTR_USER_PREFIX,
1529 .flags = GFS2_EATYPE_USR,
1530 .get = gfs2_xattr_get,
1531 .set = gfs2_xattr_set,
1534 static const struct xattr_handler gfs2_xattr_security_handler = {
1535 .prefix = XATTR_SECURITY_PREFIX,
1536 .flags = GFS2_EATYPE_SECURITY,
1537 .get = gfs2_xattr_get,
1538 .set = gfs2_xattr_set,
1541 const struct xattr_handler *gfs2_xattr_handlers[] = {
1542 &gfs2_xattr_user_handler,
1543 &gfs2_xattr_security_handler,
1544 &gfs2_xattr_system_handler,