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 <linux/posix_acl_xattr.h>
17 #include <linux/uaccess.h>
33 * ea_calc_size - returns the acutal number of bytes the request will take up
34 * (not counting any unstuffed data blocks)
39 * Returns: 1 if the EA should be stuffed
42 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
45 unsigned int jbsize = sdp->sd_jbsize;
48 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
54 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
55 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
60 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
64 if (dsize > GFS2_EA_MAX_DATA_LEN)
67 ea_calc_size(sdp, nsize, dsize, &size);
69 /* This can only happen with 512 byte blocks */
70 if (size > sdp->sd_jbsize)
76 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
77 struct gfs2_ea_header *ea,
78 struct gfs2_ea_header *prev, void *private);
80 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
81 ea_call_t ea_call, void *data)
83 struct gfs2_ea_header *ea, *prev = NULL;
86 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
89 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
90 if (!GFS2_EA_REC_LEN(ea))
92 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
93 bh->b_data + bh->b_size))
95 if (!GFS2_EATYPE_VALID(ea->ea_type))
98 error = ea_call(ip, bh, ea, prev, data);
102 if (GFS2_EA_IS_LAST(ea)) {
103 if ((char *)GFS2_EA2NEXT(ea) !=
104 bh->b_data + bh->b_size)
113 gfs2_consist_inode(ip);
117 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
119 struct buffer_head *bh, *eabh;
123 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
127 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
128 error = ea_foreach_i(ip, bh, ea_call, data);
132 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
137 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
138 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
140 for (; eablk < end; eablk++) {
145 bn = be64_to_cpu(*eablk);
147 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
150 error = ea_foreach_i(ip, eabh, ea_call, data);
164 struct gfs2_ea_location *ef_el;
167 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
168 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
171 struct ea_find *ef = private;
173 if (ea->ea_type == GFS2_EATYPE_UNUSED)
176 if (ea->ea_type == ef->type) {
177 if (ea->ea_name_len == ef->namel &&
178 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
179 struct gfs2_ea_location *el = ef->ef_el;
191 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
192 struct gfs2_ea_location *el)
199 ef.namel = strlen(name);
202 memset(el, 0, sizeof(struct gfs2_ea_location));
204 error = ea_foreach(ip, ea_find_i, &ef);
212 * ea_dealloc_unstuffed -
219 * Take advantage of the fact that all unstuffed blocks are
220 * allocated from the same RG. But watch, this may not always
226 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
227 struct gfs2_ea_header *ea,
228 struct gfs2_ea_header *prev, void *private)
230 int *leave = private;
231 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
232 struct gfs2_rgrpd *rgd;
233 struct gfs2_holder rg_gh;
234 struct buffer_head *dibh;
238 unsigned int blen = 0;
239 unsigned int blks = 0;
243 error = gfs2_rindex_update(sdp);
247 if (GFS2_EA_IS_STUFFED(ea))
250 dataptrs = GFS2_EA2DATAPTRS(ea);
251 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
254 bn = be64_to_cpu(*dataptrs);
260 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
262 gfs2_consist_inode(ip);
266 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
270 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
271 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
275 gfs2_trans_add_meta(ip->i_gl, bh);
277 dataptrs = GFS2_EA2DATAPTRS(ea);
278 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
281 bn = be64_to_cpu(*dataptrs);
283 if (bstart + blen == bn)
287 gfs2_free_meta(ip, bstart, blen);
293 gfs2_add_inode_blocks(&ip->i_inode, -1);
296 gfs2_free_meta(ip, bstart, blen);
298 if (prev && !leave) {
301 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
302 prev->ea_rec_len = cpu_to_be32(len);
304 if (GFS2_EA_IS_LAST(ea))
305 prev->ea_flags |= GFS2_EAFLAG_LAST;
307 ea->ea_type = GFS2_EATYPE_UNUSED;
311 error = gfs2_meta_inode_buffer(ip, &dibh);
313 ip->i_inode.i_ctime = current_time(&ip->i_inode);
314 gfs2_trans_add_meta(ip->i_gl, dibh);
315 gfs2_dinode_out(ip, dibh->b_data);
322 gfs2_glock_dq_uninit(&rg_gh);
326 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
327 struct gfs2_ea_header *ea,
328 struct gfs2_ea_header *prev, int leave)
332 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
336 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
340 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
342 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(d_inode(dentry));
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_iter_unstuffed - copies the unstuffed xattr data to/from the
455 * @ip: The GFS2 inode
456 * @ea: The extended attribute header structure
457 * @din: The data to be copied in
458 * @dout: The data to be copied out (one of din,dout will be NULL)
463 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
464 const char *din, char *dout)
466 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
467 struct buffer_head **bh;
468 unsigned int amount = GFS2_EA_DATA_LEN(ea);
469 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
470 __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, 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 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
506 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
509 memcpy(dout, pos, cp_size);
510 dout += sdp->sd_jbsize;
514 gfs2_trans_add_meta(ip->i_gl, bh[x]);
515 memcpy(pos, din, cp_size);
516 din += sdp->sd_jbsize;
519 amount -= sdp->sd_jbsize;
528 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
529 char *data, size_t size)
532 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
536 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
537 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
540 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
546 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
548 struct gfs2_ea_location el;
553 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
558 if (!GFS2_EA_DATA_LEN(el.el_ea))
561 len = GFS2_EA_DATA_LEN(el.el_ea);
562 data = kmalloc(len, GFP_NOFS);
567 error = gfs2_ea_get_copy(ip, &el, data, len);
578 * gfs2_xattr_get - Get a GFS2 extended attribute
580 * @name: The name of the extended attribute
581 * @buffer: The buffer to write the result into
582 * @size: The size of the buffer
583 * @type: The type of extended attribute
585 * Returns: actual size of data on success, -errno on error
587 static int __gfs2_xattr_get(struct inode *inode, const char *name,
588 void *buffer, size_t size, int type)
590 struct gfs2_inode *ip = GFS2_I(inode);
591 struct gfs2_ea_location el;
596 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
599 error = gfs2_ea_find(ip, type, name, &el);
605 error = gfs2_ea_get_copy(ip, &el, buffer, size);
607 error = GFS2_EA_DATA_LEN(el.el_ea);
613 static int gfs2_xattr_get(const struct xattr_handler *handler,
614 struct dentry *unused, struct inode *inode,
615 const char *name, void *buffer, size_t size)
617 struct gfs2_inode *ip = GFS2_I(inode);
618 struct gfs2_holder gh;
619 bool need_unlock = false;
622 /* During lookup, SELinux calls this function with the glock locked. */
624 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
625 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
630 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
632 gfs2_glock_dq_uninit(&gh);
637 * ea_alloc_blk - allocates a new block for extended attributes.
638 * @ip: A pointer to the inode that's getting extended attributes
639 * @bhp: Pointer to pointer to a struct buffer_head
644 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
646 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
647 struct gfs2_ea_header *ea;
652 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
655 gfs2_trans_add_unrevoke(sdp, block, 1);
656 *bhp = gfs2_meta_new(ip->i_gl, block);
657 gfs2_trans_add_meta(ip->i_gl, *bhp);
658 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
659 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
661 ea = GFS2_EA_BH2FIRST(*bhp);
662 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
663 ea->ea_type = GFS2_EATYPE_UNUSED;
664 ea->ea_flags = GFS2_EAFLAG_LAST;
667 gfs2_add_inode_blocks(&ip->i_inode, 1);
673 * ea_write - writes the request info to an ea, creating new blocks if
675 * @ip: inode that is being modified
676 * @ea: the location of the new ea in a block
677 * @er: the write request
679 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
684 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
685 struct gfs2_ea_request *er)
687 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
690 ea->ea_data_len = cpu_to_be32(er->er_data_len);
691 ea->ea_name_len = er->er_name_len;
692 ea->ea_type = er->er_type;
695 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
697 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
699 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
701 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
702 const char *data = er->er_data;
703 unsigned int data_len = er->er_data_len;
707 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
708 for (x = 0; x < ea->ea_num_ptrs; x++) {
709 struct buffer_head *bh;
711 int mh_size = sizeof(struct gfs2_meta_header);
714 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
717 gfs2_trans_add_unrevoke(sdp, block, 1);
718 bh = gfs2_meta_new(ip->i_gl, block);
719 gfs2_trans_add_meta(ip->i_gl, bh);
720 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
722 gfs2_add_inode_blocks(&ip->i_inode, 1);
724 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
726 memcpy(bh->b_data + mh_size, data, copy);
727 if (copy < sdp->sd_jbsize)
728 memset(bh->b_data + mh_size + copy, 0,
729 sdp->sd_jbsize - copy);
731 *dataptr++ = cpu_to_be64(bh->b_blocknr);
738 gfs2_assert_withdraw(sdp, !data_len);
744 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
745 struct gfs2_ea_request *er, void *private);
747 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
749 ea_skeleton_call_t skeleton_call, void *private)
751 struct gfs2_alloc_parms ap = { .target = blks };
752 struct buffer_head *dibh;
755 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
759 error = gfs2_quota_lock_check(ip, &ap);
763 error = gfs2_inplace_reserve(ip, &ap);
767 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
768 blks + gfs2_rg_blocks(ip, blks) +
769 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
773 error = skeleton_call(ip, er, private);
777 error = gfs2_meta_inode_buffer(ip, &dibh);
779 ip->i_inode.i_ctime = current_time(&ip->i_inode);
780 gfs2_trans_add_meta(ip->i_gl, dibh);
781 gfs2_dinode_out(ip, dibh->b_data);
786 gfs2_trans_end(GFS2_SB(&ip->i_inode));
788 gfs2_inplace_release(ip);
790 gfs2_quota_unlock(ip);
794 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
797 struct buffer_head *bh;
800 error = ea_alloc_blk(ip, &bh);
804 ip->i_eattr = bh->b_blocknr;
805 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
813 * ea_init - initializes a new eattr block
820 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
821 const void *data, size_t size)
823 struct gfs2_ea_request er;
824 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
825 unsigned int blks = 1;
829 er.er_name_len = strlen(name);
830 er.er_data = (void *)data;
831 er.er_data_len = size;
833 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
834 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
836 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
839 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
841 u32 ea_size = GFS2_EA_SIZE(ea);
842 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
844 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
845 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
847 ea->ea_rec_len = cpu_to_be32(ea_size);
848 ea->ea_flags ^= last;
850 new->ea_rec_len = cpu_to_be32(new_size);
851 new->ea_flags = last;
856 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
857 struct gfs2_ea_location *el)
859 struct gfs2_ea_header *ea = el->el_ea;
860 struct gfs2_ea_header *prev = el->el_prev;
863 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
865 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
866 ea->ea_type = GFS2_EATYPE_UNUSED;
868 } else if (GFS2_EA2NEXT(prev) != ea) {
869 prev = GFS2_EA2NEXT(prev);
870 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
873 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
874 prev->ea_rec_len = cpu_to_be32(len);
876 if (GFS2_EA_IS_LAST(ea))
877 prev->ea_flags |= GFS2_EAFLAG_LAST;
883 struct gfs2_ea_request *es_er;
884 struct gfs2_ea_location *es_el;
886 struct buffer_head *es_bh;
887 struct gfs2_ea_header *es_ea;
890 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
891 struct gfs2_ea_header *ea, struct ea_set *es)
893 struct gfs2_ea_request *er = es->es_er;
894 struct buffer_head *dibh;
897 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
901 gfs2_trans_add_meta(ip->i_gl, bh);
904 ea = ea_split_ea(ea);
906 ea_write(ip, ea, er);
909 ea_set_remove_stuffed(ip, es->es_el);
911 error = gfs2_meta_inode_buffer(ip, &dibh);
914 ip->i_inode.i_ctime = current_time(&ip->i_inode);
915 gfs2_trans_add_meta(ip->i_gl, dibh);
916 gfs2_dinode_out(ip, dibh->b_data);
919 gfs2_trans_end(GFS2_SB(&ip->i_inode));
923 static int ea_set_simple_alloc(struct gfs2_inode *ip,
924 struct gfs2_ea_request *er, void *private)
926 struct ea_set *es = private;
927 struct gfs2_ea_header *ea = es->es_ea;
930 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
933 ea = ea_split_ea(ea);
935 error = ea_write(ip, ea, er);
940 ea_set_remove_stuffed(ip, es->es_el);
945 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
946 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
949 struct ea_set *es = private;
954 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
955 es->es_er->er_data_len, &size);
957 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
958 if (GFS2_EA_REC_LEN(ea) < size)
960 if (!GFS2_EA_IS_STUFFED(ea)) {
961 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
966 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
972 error = ea_set_simple_noalloc(ip, bh, ea, es);
980 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
981 GFS2_SB(&ip->i_inode)->sd_jbsize);
983 error = ea_alloc_skeleton(ip, es->es_er, blks,
984 ea_set_simple_alloc, es);
992 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
995 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
996 struct buffer_head *indbh, *newbh;
999 int mh_size = sizeof(struct gfs2_meta_header);
1001 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1004 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
1009 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1014 eablk = (__be64 *)(indbh->b_data + mh_size);
1015 end = eablk + sdp->sd_inptrs;
1017 for (; eablk < end; eablk++)
1026 gfs2_trans_add_meta(ip->i_gl, indbh);
1030 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1033 gfs2_trans_add_unrevoke(sdp, blk, 1);
1034 indbh = gfs2_meta_new(ip->i_gl, blk);
1035 gfs2_trans_add_meta(ip->i_gl, indbh);
1036 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1037 gfs2_buffer_clear_tail(indbh, mh_size);
1039 eablk = (__be64 *)(indbh->b_data + mh_size);
1040 *eablk = cpu_to_be64(ip->i_eattr);
1042 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1043 gfs2_add_inode_blocks(&ip->i_inode, 1);
1048 error = ea_alloc_blk(ip, &newbh);
1052 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1053 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1059 ea_set_remove_stuffed(ip, private);
1066 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1067 const void *value, size_t size, struct gfs2_ea_location *el)
1069 struct gfs2_ea_request er;
1071 unsigned int blks = 2;
1076 er.er_data = (void *)value;
1077 er.er_name_len = strlen(name);
1078 er.er_data_len = size;
1080 memset(&es, 0, sizeof(struct ea_set));
1084 error = ea_foreach(ip, ea_set_simple, &es);
1090 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1092 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1093 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1095 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1098 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1099 struct gfs2_ea_location *el)
1101 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1102 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1103 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1104 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1107 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1110 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1112 struct gfs2_ea_header *ea = el->el_ea;
1113 struct gfs2_ea_header *prev = el->el_prev;
1114 struct buffer_head *dibh;
1117 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1121 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1126 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1127 prev->ea_rec_len = cpu_to_be32(len);
1129 if (GFS2_EA_IS_LAST(ea))
1130 prev->ea_flags |= GFS2_EAFLAG_LAST;
1132 ea->ea_type = GFS2_EATYPE_UNUSED;
1135 error = gfs2_meta_inode_buffer(ip, &dibh);
1137 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1138 gfs2_trans_add_meta(ip->i_gl, dibh);
1139 gfs2_dinode_out(ip, dibh->b_data);
1143 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1149 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1151 * @type: The type of the extended attribute
1152 * @name: The name of the extended attribute
1154 * This is not called directly by the VFS since we use the (common)
1155 * scheme of making a "set with NULL data" mean a remove request. Note
1156 * that this is different from a set with zero length data.
1158 * Returns: 0, or errno on failure
1161 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1163 struct gfs2_ea_location el;
1169 error = gfs2_ea_find(ip, type, name, &el);
1175 if (GFS2_EA_IS_STUFFED(el.el_ea))
1176 error = ea_remove_stuffed(ip, &el);
1178 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1186 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1188 * @name: The name of the extended attribute
1189 * @value: The value of the extended attribute (NULL for remove)
1190 * @size: The size of the @value argument
1191 * @flags: Create or Replace
1192 * @type: The type of the extended attribute
1194 * See gfs2_xattr_remove() for details of the removal of xattrs.
1196 * Returns: 0 or errno on failure
1199 int __gfs2_xattr_set(struct inode *inode, const char *name,
1200 const void *value, size_t size, int flags, int type)
1202 struct gfs2_inode *ip = GFS2_I(inode);
1203 struct gfs2_sbd *sdp = GFS2_SB(inode);
1204 struct gfs2_ea_location el;
1205 unsigned int namel = strlen(name);
1208 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1210 if (namel > GFS2_EA_MAX_NAME_LEN)
1213 if (value == NULL) {
1214 error = gfs2_xattr_remove(ip, type, name);
1215 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1220 if (ea_check_size(sdp, namel, size))
1224 if (flags & XATTR_REPLACE)
1226 return ea_init(ip, type, name, value, size);
1229 error = gfs2_ea_find(ip, type, name, &el);
1234 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1240 if (!(flags & XATTR_CREATE)) {
1241 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1242 error = ea_set_i(ip, type, name, value, size, &el);
1243 if (!error && unstuffed)
1244 ea_set_remove_unstuffed(ip, &el);
1252 if (!(flags & XATTR_REPLACE))
1253 error = ea_set_i(ip, type, name, value, size, NULL);
1258 static int gfs2_xattr_set(const struct xattr_handler *handler,
1259 struct dentry *unused, struct inode *inode,
1260 const char *name, const void *value,
1261 size_t size, int flags)
1263 struct gfs2_inode *ip = GFS2_I(inode);
1264 struct gfs2_holder gh;
1267 ret = gfs2_rsqa_alloc(ip);
1271 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1274 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1275 gfs2_glock_dq_uninit(&gh);
1279 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1281 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1282 struct gfs2_rgrp_list rlist;
1283 struct buffer_head *indbh, *dibh;
1284 __be64 *eablk, *end;
1285 unsigned int rg_blocks = 0;
1287 unsigned int blen = 0;
1288 unsigned int blks = 0;
1292 error = gfs2_rindex_update(sdp);
1296 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1298 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1302 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1307 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1308 end = eablk + sdp->sd_inptrs;
1310 for (; eablk < end; eablk++) {
1315 bn = be64_to_cpu(*eablk);
1317 if (bstart + blen == bn)
1321 gfs2_rlist_add(ip, &rlist, bstart);
1328 gfs2_rlist_add(ip, &rlist, bstart);
1332 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1334 for (x = 0; x < rlist.rl_rgrps; x++) {
1335 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1337 rg_blocks += rgd->rd_length;
1340 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1342 goto out_rlist_free;
1344 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1345 RES_STATFS + RES_QUOTA, blks);
1349 gfs2_trans_add_meta(ip->i_gl, indbh);
1351 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1355 for (; eablk < end; eablk++) {
1360 bn = be64_to_cpu(*eablk);
1362 if (bstart + blen == bn)
1366 gfs2_free_meta(ip, bstart, blen);
1372 gfs2_add_inode_blocks(&ip->i_inode, -1);
1375 gfs2_free_meta(ip, bstart, blen);
1377 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1379 error = gfs2_meta_inode_buffer(ip, &dibh);
1381 gfs2_trans_add_meta(ip->i_gl, dibh);
1382 gfs2_dinode_out(ip, dibh->b_data);
1386 gfs2_trans_end(sdp);
1389 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1391 gfs2_rlist_free(&rlist);
1397 static int ea_dealloc_block(struct gfs2_inode *ip)
1399 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1400 struct gfs2_rgrpd *rgd;
1401 struct buffer_head *dibh;
1402 struct gfs2_holder gh;
1405 error = gfs2_rindex_update(sdp);
1409 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1411 gfs2_consist_inode(ip);
1415 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1419 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1424 gfs2_free_meta(ip, ip->i_eattr, 1);
1427 gfs2_add_inode_blocks(&ip->i_inode, -1);
1429 error = gfs2_meta_inode_buffer(ip, &dibh);
1431 gfs2_trans_add_meta(ip->i_gl, dibh);
1432 gfs2_dinode_out(ip, dibh->b_data);
1436 gfs2_trans_end(sdp);
1439 gfs2_glock_dq_uninit(&gh);
1444 * gfs2_ea_dealloc - deallocate the extended attribute fork
1450 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1454 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1458 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1462 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1466 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1467 error = ea_dealloc_indirect(ip);
1472 error = ea_dealloc_block(ip);
1475 gfs2_quota_unhold(ip);
1479 static const struct xattr_handler gfs2_xattr_user_handler = {
1480 .prefix = XATTR_USER_PREFIX,
1481 .flags = GFS2_EATYPE_USR,
1482 .get = gfs2_xattr_get,
1483 .set = gfs2_xattr_set,
1486 static const struct xattr_handler gfs2_xattr_security_handler = {
1487 .prefix = XATTR_SECURITY_PREFIX,
1488 .flags = GFS2_EATYPE_SECURITY,
1489 .get = gfs2_xattr_get,
1490 .set = gfs2_xattr_set,
1493 const struct xattr_handler *gfs2_xattr_handlers[] = {
1494 &gfs2_xattr_user_handler,
1495 &gfs2_xattr_security_handler,
1496 &posix_acl_access_xattr_handler,
1497 &posix_acl_default_xattr_handler,