[GFS2] Fix unlinked file handling

This patch fixes the way we have been dealing with unlinked,
but still open files. It removes all limits (other than memory
for inodes, as per every other filesystem) on numbers of these
which we can support on GFS2. It also means that (like other
fs) its the responsibility of the last process to close the file
to deallocate the storage, rather than the person who did the
unlinking. Note that with GFS2, those two events might take place
on different nodes.

Also there are a number of other changes:

 o We use the Linux inode subsystem as it was intended to be
used, wrt allocating GFS2 inodes
 o The Linux inode cache is now the point which we use for
local enforcement of only holding one copy of the inode in
core at once (previous to this we used the glock layer).
 o We no longer use the unlinked "special" file. We just ignore it
completely. This makes unlinking more efficient.
 o We now use the 4th block allocation state. The previously unused
state is used to track unlinked but still open inodes.
 o gfs2_inoded is no longer needed
 o Several fields are now no longer needed (and removed) from the in
core struct gfs2_inode
 o Several fields are no longer needed (and removed) from the in core
superblock

There are a number of future possible optimisations and clean ups
which have been made possible by this patch.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 35 insertions, 35 deletions

diff --git a/fs/gfs2/eattr.c b/fs/gfs2/eattr.c
index 2e114c075707..96736932260f 100644
--- a/fs/gfs2/eattr.c
+++ b/fs/gfs2/eattr.c
@@ -80,7 +80,7 @@ static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
 	struct gfs2_ea_header *ea, *prev = NULL;
 	int error = 0;
 
-	if (gfs2_metatype_check(ip->i_sbd, bh, GFS2_METATYPE_EA))
+	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
 		return -EIO;
 
 	for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
@@ -128,13 +128,13 @@ static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 		goto out;
 	}
 
-	if (gfs2_metatype_check(ip->i_sbd, bh, GFS2_METATYPE_IN)) {
+	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 		error = -EIO;
 		goto out;
 	}
 
 	eablk = (uint64_t *)(bh->b_data + sizeof(struct gfs2_meta_header));
-	end = eablk + ip->i_sbd->sd_inptrs;
+	end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 
 	for (; eablk < end; eablk++) {
 		uint64_t bn;
@@ -232,7 +232,7 @@ static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 				struct gfs2_ea_header *prev, void *private)
 {
 	int *leave = private;
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct gfs2_rgrpd *rgd;
 	struct gfs2_holder rg_gh;
 	struct buffer_head *dibh;
@@ -338,7 +338,7 @@ static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 	if (error)
 		goto out_alloc;
 
-	error = gfs2_rindex_hold(ip->i_sbd, &al->al_ri_gh);
+	error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
 	if (error)
 		goto out_quota;
 
@@ -459,7 +459,7 @@ int gfs2_ea_list(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 			    char *data)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct buffer_head **bh;
 	unsigned int amount = GFS2_EA_DATA_LEN(ea);
 	unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
@@ -604,7 +604,7 @@ int gfs2_ea_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 
 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct gfs2_ea_header *ea;
 	uint64_t block;
 
@@ -641,7 +641,7 @@ static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 		    struct gfs2_ea_request *er)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 
 	ea->ea_data_len = cpu_to_be32(er->er_data_len);
 	ea->ea_name_len = er->er_name_len;
@@ -723,7 +723,7 @@ static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 	if (error)
 		goto out_gunlock_q;
 
-	error = gfs2_trans_begin(ip->i_sbd,
+	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 				 blks + al->al_rgd->rd_ri.ri_length +
 				 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 	if (error)
@@ -736,7 +736,7 @@ static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 	error = gfs2_meta_inode_buffer(ip, &dibh);
 	if (!error) {
 		if (er->er_flags & GFS2_ERF_MODE) {
-			gfs2_assert_withdraw(ip->i_sbd,
+			gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
 					    (ip->i_di.di_mode & S_IFMT) ==
 					    (er->er_mode & S_IFMT));
 			ip->i_di.di_mode = er->er_mode;
@@ -748,7 +748,7 @@ static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 	}
 
  out_end_trans:
-	gfs2_trans_end(ip->i_sbd);
+	gfs2_trans_end(GFS2_SB(&ip->i_inode));
 
  out_ipres:
 	gfs2_inplace_release(ip);
@@ -790,7 +790,7 @@ static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 
 static int ea_init(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
-	unsigned int jbsize = ip->i_sbd->sd_jbsize;
+	unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 	unsigned int blks = 1;
 
 	if (GFS2_EAREQ_SIZE_STUFFED(er) > jbsize)
@@ -830,7 +830,7 @@ static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 		return;
 	} else if (GFS2_EA2NEXT(prev) != ea) {
 		prev = GFS2_EA2NEXT(prev);
-		gfs2_assert_withdraw(ip->i_sbd, GFS2_EA2NEXT(prev) == ea);
+		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 	}
 
 	len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
@@ -857,7 +857,7 @@ static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 	struct buffer_head *dibh;
 	int error;
 
-	error = gfs2_trans_begin(ip->i_sbd, RES_DINODE + 2 * RES_EATTR, 0);
+	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 	if (error)
 		return error;
 
@@ -876,7 +876,7 @@ static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 		goto out;
 
 	if (er->er_flags & GFS2_ERF_MODE) {
-		gfs2_assert_withdraw(ip->i_sbd,
+		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
 			(ip->i_di.di_mode & S_IFMT) == (er->er_mode & S_IFMT));
 		ip->i_di.di_mode = er->er_mode;
 	}
@@ -885,7 +885,7 @@ static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 	gfs2_dinode_out(&ip->i_di, dibh->b_data);
 	brelse(dibh);
  out:
-	gfs2_trans_end(ip->i_sbd);
+	gfs2_trans_end(GFS2_SB(&ip->i_inode));
 
 	return error;
 }
@@ -921,7 +921,7 @@ static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 	int stuffed;
 	int error;
 
-	stuffed = ea_calc_size(ip->i_sbd, es->es_er, &size);
+	stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er, &size);
 
 	if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 		if (GFS2_EA_REC_LEN(ea) < size)
@@ -947,7 +947,7 @@ static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 		es->es_bh = bh;
 		es->es_ea = ea;
 		blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
-					ip->i_sbd->sd_jbsize);
+					GFS2_SB(&ip->i_inode)->sd_jbsize);
 
 		error = ea_alloc_skeleton(ip, es->es_er, blks,
 					  ea_set_simple_alloc, es);
@@ -961,7 +961,7 @@ static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 			void *private)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct buffer_head *indbh, *newbh;
 	uint64_t *eablk;
 	int error;
@@ -1050,8 +1050,8 @@ static int ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 
 	if (!(ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT))
 		blks++;
-	if (GFS2_EAREQ_SIZE_STUFFED(er) > ip->i_sbd->sd_jbsize)
-		blks += DIV_ROUND_UP(er->er_data_len, ip->i_sbd->sd_jbsize);
+	if (GFS2_EAREQ_SIZE_STUFFED(er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
+		blks += DIV_ROUND_UP(er->er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
 
 	return ea_alloc_skeleton(ip, er, blks, ea_set_block, el);
 }
@@ -1061,7 +1061,7 @@ static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
 {
 	if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
 		el->el_prev = GFS2_EA2NEXT(el->el_prev);
-		gfs2_assert_withdraw(ip->i_sbd,
+		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
 				     GFS2_EA2NEXT(el->el_prev) == el->el_ea);
 	}
 
@@ -1119,7 +1119,7 @@ int gfs2_ea_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 		er->er_data = NULL;
 		er->er_data_len = 0;
 	}
-	error = ea_check_size(ip->i_sbd, er);
+	error = ea_check_size(GFS2_SB(&ip->i_inode), er);
 	if (error)
 		return error;
 
@@ -1127,7 +1127,7 @@ int gfs2_ea_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 	if (error)
 		return error;
 
-	if (IS_IMMUTABLE(ip->i_vnode))
+	if (IS_IMMUTABLE(&ip->i_inode))
 		error = -EPERM;
 	else
 		error = gfs2_ea_ops[er->er_type]->eo_set(ip, er);
@@ -1144,7 +1144,7 @@ static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
 	struct buffer_head *dibh;
 	int error;
 
-	error = gfs2_trans_begin(ip->i_sbd, RES_DINODE + RES_EATTR, 0);
+	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
 	if (error)
 		return error;
 
@@ -1169,7 +1169,7 @@ static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
 		brelse(dibh);
 	}	
 
-	gfs2_trans_end(ip->i_sbd);
+	gfs2_trans_end(GFS2_SB(&ip->i_inode));
 
 	return error;
 }
@@ -1219,7 +1219,7 @@ int gfs2_ea_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 	if (error)
 		return error;
 
-	if (IS_IMMUTABLE(ip->i_vnode) || IS_APPEND(ip->i_vnode))
+	if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
 		error = -EPERM;
 	else
 		error = gfs2_ea_ops[er->er_type]->eo_remove(ip, er);
@@ -1232,7 +1232,7 @@ int gfs2_ea_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
 				  struct gfs2_ea_header *ea, char *data)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct buffer_head **bh;
 	unsigned int amount = GFS2_EA_DATA_LEN(ea);
 	unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
@@ -1304,7 +1304,7 @@ int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 	int error;
 
 	if (GFS2_EA_IS_STUFFED(el->el_ea)) {
-		error = gfs2_trans_begin(ip->i_sbd, RES_DINODE + RES_EATTR, 0);
+		error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
 		if (error)
 			return error;
 
@@ -1320,22 +1320,22 @@ int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 
 	error = gfs2_meta_inode_buffer(ip, &dibh);
 	if (!error) {
-		error = inode_setattr(ip->i_vnode, attr);
-		gfs2_assert_warn(ip->i_sbd, !error);
+		error = inode_setattr(&ip->i_inode, attr);
+		gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
 		gfs2_inode_attr_out(ip);
 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 		gfs2_dinode_out(&ip->i_di, dibh->b_data);
 		brelse(dibh);
 	}
 
-	gfs2_trans_end(ip->i_sbd);
+	gfs2_trans_end(GFS2_SB(&ip->i_inode));
 
 	return error;
 }
 
 static int ea_dealloc_indirect(struct gfs2_inode *ip)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct gfs2_rgrp_list rlist;
 	struct buffer_head *indbh, *dibh;
 	uint64_t *eablk, *end;
@@ -1456,7 +1456,7 @@ static int ea_dealloc_indirect(struct gfs2_inode *ip)
 
 static int ea_dealloc_block(struct gfs2_inode *ip)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct gfs2_alloc *al = &ip->i_alloc;
 	struct gfs2_rgrpd *rgd;
 	struct buffer_head *dibh;
@@ -1518,7 +1518,7 @@ int gfs2_ea_dealloc(struct gfs2_inode *ip)
 	if (error)
 		goto out_alloc;
 
-	error = gfs2_rindex_hold(ip->i_sbd, &al->al_ri_gh);
+	error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
 	if (error)
 		goto out_quota;