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authorDave Chinner <dchinner@redhat.com>2016-02-09 06:54:58 +0100
committerDave Chinner <david@fromorbit.com>2016-02-09 06:54:58 +0100
commit54d7b5c1d03e9711cce2d72237d5b3f5c87431f4 (patch)
tree217051439807a7bc0fba823d0319c7a5900cc2c3 /fs/xfs/xfs_inode.c
parentxfs: reinitialise recycled VFS inode correctly (diff)
downloadlinux-54d7b5c1d03e9711cce2d72237d5b3f5c87431f4.tar.xz
linux-54d7b5c1d03e9711cce2d72237d5b3f5c87431f4.zip
xfs: use vfs inode nlink field everywhere
The VFS tracks the inode nlink 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> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_inode.c')
-rw-r--r--fs/xfs/xfs_inode.c77
1 files changed, 34 insertions, 43 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 7d9c514fd231..18b3bc0c211a 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -57,9 +57,9 @@ kmem_zone_t *xfs_inode_zone;
*/
#define XFS_ITRUNC_MAX_EXTENTS 2
-STATIC int xfs_iflush_int(xfs_inode_t *, xfs_buf_t *);
-
-STATIC int xfs_iunlink_remove(xfs_trans_t *, xfs_inode_t *);
+STATIC int xfs_iflush_int(struct xfs_inode *, struct xfs_buf *);
+STATIC int xfs_iunlink(struct xfs_trans *, struct xfs_inode *);
+STATIC int xfs_iunlink_remove(struct xfs_trans *, struct xfs_inode *);
/*
* helper function to extract extent size hint from inode
@@ -803,7 +803,7 @@ 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);
@@ -1086,35 +1086,24 @@ xfs_dir_ialloc(
}
/*
- * Decrement the link count on an inode & log the change.
- * If this causes the link count to go to zero, initiate the
- * logging activity required to truncate a file.
+ * Decrement the link count on an inode & log the change. If this causes the
+ * link count to go to zero, move the inode to AGI unlinked list so that it can
+ * be freed when the last active reference goes away via xfs_inactive().
*/
int /* error */
xfs_droplink(
xfs_trans_t *tp,
xfs_inode_t *ip)
{
- int error;
-
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) {
- /*
- * We're dropping the last link to this file.
- * Move the on-disk inode to the AGI unlinked list.
- * From xfs_inactive() we will pull the inode from
- * the list and free it.
- */
- error = xfs_iunlink(tp, ip);
- }
- return error;
+ if (VFS_I(ip)->i_nlink)
+ return 0;
+
+ return xfs_iunlink(tp, ip);
}
/*
@@ -1128,8 +1117,6 @@ 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;
@@ -1387,7 +1374,6 @@ 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;
@@ -1486,7 +1472,10 @@ 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;
@@ -1673,7 +1662,7 @@ 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)) {
@@ -1889,7 +1878,7 @@ 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
@@ -1946,16 +1935,21 @@ xfs_inactive(
}
/*
- * This is called when the inode's link count goes to 0.
- * We place the on-disk inode on a list in the AGI. It
- * will be pulled from this list when the inode is freed.
+ * This is called when the inode's link count goes to 0 or we are creating a
+ * tmpfile via O_TMPFILE. In the case of a tmpfile, @ignore_linkcount will be
+ * set to true as the link count is dropped to zero by the VFS after we've
+ * created the file successfully, so we have to add it to the unlinked list
+ * while the link count is non-zero.
+ *
+ * We place the on-disk inode on a list in the AGI. It will be pulled from this
+ * list when the inode is freed.
*/
-int
+STATIC int
xfs_iunlink(
- xfs_trans_t *tp,
- xfs_inode_t *ip)
+ struct xfs_trans *tp,
+ struct xfs_inode *ip)
{
- xfs_mount_t *mp;
+ xfs_mount_t *mp = tp->t_mountp;
xfs_agi_t *agi;
xfs_dinode_t *dip;
xfs_buf_t *agibp;
@@ -1965,11 +1959,8 @@ xfs_iunlink(
int offset;
int error;
- ASSERT(ip->i_d.di_nlink == 0);
ASSERT(ip->i_d.di_mode != 0);
- mp = tp->t_mountp;
-
/*
* Get the agi buffer first. It ensures lock ordering
* on the list.
@@ -2406,7 +2397,7 @@ 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));
@@ -2574,8 +2565,8 @@ 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;
}
@@ -3031,7 +3022,7 @@ 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;
}
@@ -3138,7 +3129,7 @@ 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;