[PATCH 5/8] xfs: use vfs inode nlink field everywhere

Dave Chinner
2016-01-12T09:01:34Z

The Vfs tracks the inodenlink just like the xfs_icdinode. We can
remove the variable from the icdinode and use the vfs inode variable
everywhere, reducing the size of the xfs_icdinode by a further 4
bytes.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
fs/xfs/libxfs/xfs_inode_buf.c | 6 +++---
fs/xfs/libxfs/xfs_inode_buf.h | 1 -
fs/xfs/xfs_inode.c | 30 ++++++++++++++----------------
fs/xfs/xfs_inode_item.c | 2 +-
fs/xfs/xfs_iops.c | 3 +--
fs/xfs/xfs_itable.c | 2 +-
fs/xfs/xfs_log_recover.c | 2 +-
7 files changed, 21 insertions(+), 25 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index a3e79a9..6c00277 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -210,12 +210,12 @@ xfs_inode_from_disk(
* minimum inode version format we support in the rest of the code.
*/
if (to->di_version == 1) {
- to->di_nlink = be16_to_cpu(from->di_onlink);
+ set_nlink(inode, be16_to_cpu(from->di_onlink));
to->di_projid_lo = 0;
to->di_projid_hi = 0;
to->di_version = 2;
} else {
- to->di_nlink = be32_to_cpu(from->di_nlink);
+ set_nlink(inode, be32_to_cpu(from->di_nlink));
to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
}
@@ -269,7 +269,6 @@ xfs_inode_to_disk(
to->di_format = from->di_format;
to->di_uid = cpu_to_be32(from->di_uid);
to->di_gid = cpu_to_be32(from->di_gid);
- to->di_nlink = cpu_to_be32(from->di_nlink);
to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
to->di_projid_hi = cpu_to_be16(from->di_projid_hi);

@@ -280,6 +279,7 @@ xfs_inode_to_disk(
to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec);
to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
+ to->di_nlink = cpu_to_be32(inode->i_nlink);

to->di_size = cpu_to_be64(from->di_size);
to->di_nblocks = cpu_to_be64(from->di_nblocks);
diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
index feb04e6..774d71f 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.h
+++ b/fs/xfs/libxfs/xfs_inode_buf.h
@@ -34,7 +34,6 @@ struct xfs_icdinode {
__uint16_t di_flushiter; /* incremented on flush */
__uint32_t di_uid; /* owner's user id */
__uint32_t di_gid; /* owner's group id */
- __uint32_t di_nlink; /* number of links to file */
__uint16_t di_projid_lo; /* lower part of owner's project id */
__uint16_t di_projid_hi; /* higher part of owner's project id */
xfs_fsize_t di_size; /* number of bytes in file */
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 914ec41..d4f328a 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -794,7 +794,7 @@ xfs_ialloc(
ip->i_d.di_version = 2;

ip->i_d.di_mode = mode;
- ip->i_d.di_nlink = nlink;
+ set_nlink(inode, nlink);
ip->i_d.di_uid = xfs_kuid_to_uid(current_fsuid());
ip->i_d.di_gid = xfs_kgid_to_gid(current_fsgid());
xfs_set_projid(ip, prid);
@@ -1085,13 +1085,11 @@ xfs_droplink(

xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);

- ASSERT (ip->i_d.di_nlink > 0);
- ip->i_d.di_nlink--;
drop_nlink(VFS_I(ip));
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

error = 0;
- if (ip->i_d.di_nlink == 0) {
+ if (VFS_I(ip)->i_nlink == 0) {
/*
* We're dropping the last link to this file.
* Move the on-disk inode to the AGI unlinked list.
@@ -1114,8 +1112,6 @@ xfs_bumplink(
xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);

ASSERT(ip->i_d.di_version > 1);
- ASSERT(ip->i_d.di_nlink > 0 || (VFS_I(ip)->i_state & I_LINKABLE));
- ip->i_d.di_nlink++;
inc_nlink(VFS_I(ip));
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
return 0;
@@ -1373,7 +1369,6 @@ xfs_create_tmpfile(
*/
xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);

- ip->i_d.di_nlink--;
error = xfs_iunlink(tp, ip);
if (error)
goto out_trans_cancel;
@@ -1472,7 +1467,10 @@ xfs_link(

xfs_bmap_init(&free_list, &first_block);

- if (sip->i_d.di_nlink == 0) {
+ /*
+ * Handle initial link state of O_TMPFILE inode
+ */
+ if (VFS_I(sip)->i_nlink == 0) {
error = xfs_iunlink_remove(tp, sip);
if (error)
goto error_return;
@@ -1659,7 +1657,7 @@ xfs_release(
}
}

- if (ip->i_d.di_nlink == 0)
+ if (VFS_I(ip)->i_nlink == 0)
return 0;

if (xfs_can_free_eofblocks(ip, false)) {
@@ -1875,7 +1873,7 @@ xfs_inactive(
if (mp->m_flags & XFS_MOUNT_RDONLY)
return;

- if (ip->i_d.di_nlink != 0) {
+ if (VFS_I(ip)->i_nlink != 0) {
/*
* force is true because we are evicting an inode from the
* cache. Post-eof blocks must be freed, lest we end up with
@@ -1951,7 +1949,7 @@ xfs_iunlink(
int offset;
int error;

- ASSERT(ip->i_d.di_nlink == 0);
+ ASSERT(VFS_I(ip)->i_nlink == 0);
ASSERT(ip->i_d.di_mode != 0);

mp = tp->t_mountp;
@@ -2392,7 +2390,7 @@ xfs_ifree(
struct xfs_icluster xic = { 0 };

ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
- ASSERT(ip->i_d.di_nlink == 0);
+ ASSERT(VFS_I(ip)->i_nlink == 0);
ASSERT(ip->i_d.di_nextents == 0);
ASSERT(ip->i_d.di_anextents == 0);
ASSERT(ip->i_d.di_size == 0 || !S_ISREG(ip->i_d.di_mode));
@@ -2560,8 +2558,8 @@ xfs_remove(
* If we're removing a directory perform some additional validation.
*/
if (is_dir) {
- ASSERT(ip->i_d.di_nlink >= 2);
- if (ip->i_d.di_nlink != 2) {
+ ASSERT(VFS_I(ip)->i_nlink >= 2);
+ if (VFS_I(ip)->i_nlink != 2) {
error = -ENOTEMPTY;
goto out_trans_cancel;
}
@@ -3017,7 +3015,7 @@ xfs_rename(
* Make sure target dir is empty.
*/
if (!(xfs_dir_isempty(target_ip)) ||
- (target_ip->i_d.di_nlink > 2)) {
+ (VFS_I(target_ip)->i_nlink > 2)) {
error = -EEXIST;
goto out_trans_cancel;
}
@@ -3124,7 +3122,7 @@ xfs_rename(
* intermediate state on disk.
*/
if (wip) {
- ASSERT(VFS_I(wip)->i_nlink == 0 && wip->i_d.di_nlink == 0);
+ ASSERT(VFS_I(wip)->i_nlink == 0);
error = xfs_bumplink(tp, wip);
if (error)
goto out_bmap_cancel;
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index d777b7a..4e3611d 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -338,7 +338,6 @@ xfs_inode_to_log_dinode(
to->di_format = from->di_format;
to->di_uid = from->di_uid;
to->di_gid = from->di_gid;
- to->di_nlink = from->di_nlink;
to->di_projid_lo = from->di_projid_lo;
to->di_projid_hi = from->di_projid_hi;

@@ -350,6 +349,7 @@ xfs_inode_to_log_dinode(
to->di_mtime.t_nsec = inode->i_mtime.tv_nsec;
to->di_ctime.t_sec = inode->i_ctime.tv_sec;
to->di_ctime.t_nsec = inode->i_ctime.tv_nsec;
+ to->di_nlink = inode->i_nlink;

to->di_size = from->di_size;
to->di_nblocks = from->di_nblocks;
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index b008677..c424d4b 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -455,7 +455,7 @@ xfs_vn_getattr(
stat->size = XFS_ISIZE(ip);
stat->dev = inode->i_sb->s_dev;
stat->mode = ip->i_d.di_mode;
- stat->nlink = ip->i_d.di_nlink;
+ stat->nlink = inode->i_nlink;
stat->uid = inode->i_uid;
stat->gid = inode->i_gid;
stat->ino = ip->i_ino;
@@ -1212,7 +1212,6 @@ xfs_setup_inode(
hlist_add_fake(&inode->i_hash);

inode->i_mode = ip->i_d.di_mode;
- set_nlink(inode, ip->i_d.di_nlink);
inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);

diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index 2acda42..cfb6527 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -85,7 +85,6 @@ xfs_bulkstat_one_int(
/* xfs_iget returns the following without needing
* further change.
*/
- buf->bs_nlink = dic->di_nlink;
buf->bs_projid_lo = dic->di_projid_lo;
buf->bs_projid_hi = dic->di_projid_hi;
buf->bs_ino = ino;
@@ -94,6 +93,7 @@ xfs_bulkstat_one_int(
buf->bs_gid = dic->di_gid;
buf->bs_size = dic->di_size;

+ buf->bs_nlink = inode->i_nlink;
buf->bs_atime.tv_sec = inode->i_atime.tv_sec;
buf->bs_atime.tv_nsec = inode->i_atime.tv_nsec;
buf->bs_mtime.tv_sec = inode->i_mtime.tv_sec;
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 4b79cf0..611c25c 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -4337,7 +4337,7 @@ xlog_recover_process_one_iunlink(
if (error)
goto fail_iput;

- ASSERT(ip->i_d.di_nlink == 0);
+ ASSERT(VFS_I(ip)->i_nlink == 0);
ASSERT(ip->i_d.di_mode != 0);

/* setup for the next pass */