On Thu, Jan 14, 2016 at 05:09:22PM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> ---
> fs/xfs/libxfs/xfs_inode_buf.c | 6 ++--
> fs/xfs/libxfs/xfs_inode_buf.h | 1 -
> fs/xfs/xfs_inode.c | 73
> ++++++++++++++++++++-----------------------
> fs/xfs/xfs_inode.h | 2 --
> 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 +-
> 8 files changed, 41 insertions(+), 50 deletions(-)
>
...
> 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..9ee766b 100644
> --- a/fs/xfs/xfs_inode.c
> +++ b/fs/xfs/xfs_inode.c
> @@ -58,7 +58,7 @@ 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(xfs_trans_t *, xfs_inode_t *, bool);
Nit: (struct xfs_trans *, struct xfs_inode *, ...)
Might as well fix the neighbors as well I suppose.
> STATIC int xfs_iunlink_remove(xfs_trans_t *, xfs_inode_t *);
>
> /*
...
> 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);
>
I'm wondering if we have an issue here if we happen to get an inode
that's reclaimable. E.g., we get an xfs_fs_destroy_inode() call on an
inode and set the reclaimable tag. IIUC, a lookup that occurs after that
point but before we actually reclaim the inode can go through the
associated XFS_IRECLAIMABLE section of xfs_iget_cache_hit(). In there,
we call inode_init_always() which fixes inode->i_nlink = 1.
It looks like we'd call into here (xfs_setup_inode()) since we set
XFS_INEW, and thus previously this would update inode->i_nlink based on
the ip->i_d.di_nlink value, but I don't see where that would happen
now.. hmm?
Brian
> 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 */
> --
> 2.5.0
>
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