[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, 14 insertions, 14 deletions

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index f752b0184690..d3cd5171d7c7 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -248,7 +248,7 @@ static void slot_put(struct gfs2_quota_data *qd)
 static int bh_get(struct gfs2_quota_data *qd)
 {
 	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
-	struct gfs2_inode *ip = sdp->sd_qc_inode->u.generic_ip;
+	struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 	unsigned int block, offset;
 	uint64_t dblock;
 	int new = 0;
@@ -266,7 +266,7 @@ static int bh_get(struct gfs2_quota_data *qd)
 	block = qd->qd_slot / sdp->sd_qc_per_block;
 	offset = qd->qd_slot % sdp->sd_qc_per_block;;
 
-	error = gfs2_block_map(ip->i_vnode, block, &new, &dblock, &boundary);
+	error = gfs2_block_map(&ip->i_inode, block, &new, &dblock, &boundary);
 	if (error)
 		goto fail;
 	error = gfs2_meta_read(ip->i_gl, dblock, DIO_START | DIO_WAIT, &bh);
@@ -444,7 +444,7 @@ static void qdsb_put(struct gfs2_quota_data *qd)
 
 int gfs2_quota_hold(struct gfs2_inode *ip, uint32_t uid, uint32_t gid)
 {
-	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_quota_data **qd = al->al_qd;
 	int error;
@@ -493,7 +493,7 @@ int gfs2_quota_hold(struct gfs2_inode *ip, uint32_t uid, uint32_t gid)
 
 void gfs2_quota_unhold(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;
 	unsigned int x;
 
@@ -531,7 +531,7 @@ static int sort_qd(const void *a, const void *b)
 static void do_qc(struct gfs2_quota_data *qd, int64_t change)
 {
 	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
-	struct gfs2_inode *ip = sdp->sd_qc_inode->u.generic_ip;
+	struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 	struct gfs2_quota_change *qc = qd->qd_bh_qc;
 	int64_t x;
 
@@ -578,7 +578,7 @@ static void do_qc(struct gfs2_quota_data *qd, int64_t change)
 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 			     int64_t change, struct gfs2_quota_data *qd)
 {
-	struct inode *inode = ip->i_vnode;
+	struct inode *inode = &ip->i_inode;
 	struct address_space *mapping = inode->i_mapping;
 	unsigned long index = loc >> PAGE_CACHE_SHIFT;
 	unsigned offset = loc & (PAGE_CACHE_SHIFT - 1);
@@ -647,7 +647,7 @@ unlock:
 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 {
 	struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
-	struct gfs2_inode *ip = sdp->sd_quota_inode->u.generic_ip;
+	struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 	unsigned int data_blocks, ind_blocks;
 	struct file_ra_state ra_state;
 	struct gfs2_holder *ghs, i_gh;
@@ -716,7 +716,7 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 			goto out_gunlock;
 	}
 
-	file_ra_state_init(&ra_state, ip->i_vnode->i_mapping);
+	file_ra_state_init(&ra_state, ip->i_inode.i_mapping);
 	for (x = 0; x < num_qd; x++) {
 		qd = qda[x];
 		offset = qd2offset(qd);
@@ -758,7 +758,7 @@ static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 		    struct gfs2_holder *q_gh)
 {
 	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
-	struct gfs2_inode *ip = sdp->sd_quota_inode->u.generic_ip;
+	struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 	struct gfs2_holder i_gh;
 	struct gfs2_quota q;
 	char buf[sizeof(struct gfs2_quota)];
@@ -829,7 +829,7 @@ static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 
 int gfs2_quota_lock(struct gfs2_inode *ip, uint32_t uid, uint32_t gid)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct gfs2_alloc *al = &ip->i_alloc;
 	unsigned int x;
 	int error = 0;
@@ -958,7 +958,7 @@ static int print_message(struct gfs2_quota_data *qd, char *type)
 
 int gfs2_quota_check(struct gfs2_inode *ip, uint32_t uid, uint32_t gid)
 {
-	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_quota_data *qd;
 	int64_t value;
@@ -1008,7 +1008,7 @@ void gfs2_quota_change(struct gfs2_inode *ip, int64_t change,
 	unsigned int x;
 	unsigned int found = 0;
 
-	if (gfs2_assert_warn(ip->i_sbd, change))
+	if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
 		return;
 	if (ip->i_di.di_flags & GFS2_DIF_SYSTEM)
 		return;
@@ -1126,7 +1126,7 @@ int gfs2_quota_read(struct gfs2_sbd *sdp, int user, uint32_t id,
 
 int gfs2_quota_init(struct gfs2_sbd *sdp)
 {
-	struct gfs2_inode *ip = sdp->sd_qc_inode->u.generic_ip;
+	struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 	unsigned int blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
 	unsigned int x, slot = 0;
 	unsigned int found = 0;
@@ -1162,7 +1162,7 @@ int gfs2_quota_init(struct gfs2_sbd *sdp)
 
 		if (!extlen) {
 			int new = 0;
-			error = gfs2_extent_map(ip->i_vnode, x, &new, &dblock, &extlen);
+			error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
 			if (error)
 				goto fail;
 		}