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xfs: allow linkat() on O_TMPFILE files

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The VFS allows an anonymous temporary file to be named at a later
time via a linkat() syscall. The inodes for O_TMPFILE files are
are marked with a special flag I_LINKABLE and have a zero link count.

To support this in XFS, xfs_link() detects if this flag I_LINKABLE
is set and behaves appropriately when detected. So in this case,
its transaciton reservation takes into account the additional
overhead of removing the inode from the unlinked list. Then the
inode is removed from the unlinked list and the directory entry
is added. Finally its link count is bumped accordingly.

Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de> 
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Zhi Yong Wu 2013-12-18 08:22:41 +08:00 committed by Ben Myers
parent 99b6436bc2
commit ab29743117
2 changed files with 26 additions and 3 deletions
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10
fs/xfs/xfs_inode.c
View File

@ -61,6 +61,8 @@ kmem_zone_t *xfs_inode_zone;
STATIC int xfs_iflush_int(xfs_inode_t *, xfs_buf_t *);
STATIC int xfs_iunlink_remove(xfs_trans_t *, xfs_inode_t *);
/*
* helper function to extract extent size hint from inode
*/
@ -1118,7 +1120,7 @@ xfs_bumplink(
{
xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
ASSERT(ip->i_d.di_nlink > 0);
ASSERT(ip->i_d.di_nlink > 0 || (VFS_I(ip)->i_state & I_LINKABLE));
ip->i_d.di_nlink++;
inc_nlink(VFS_I(ip));
if ((ip->i_d.di_version == 1) &&
@ -1504,6 +1506,12 @@ xfs_link(
xfs_bmap_init(&free_list, &first_block);
if (sip->i_d.di_nlink == 0) {
error = xfs_iunlink_remove(tp, sip);
if (error)
goto abort_return;
}
error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
&first_block, &free_list, resblks);
if (error)

19
fs/xfs/xfs_trans_resv.c
View File

@ -203,6 +203,20 @@ xfs_calc_rename_reservation(
XFS_FSB_TO_B(mp, 1))));
}
/*
* For removing an inode from unlinked list at first, we can modify:
* the agi hash list and counters: sector size
* the on disk inode before ours in the agi hash list: inode cluster size
*/
STATIC uint
xfs_calc_iunlink_remove_reservation(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
MAX((__uint16_t)XFS_FSB_TO_B(mp, 1),
(__uint16_t)XFS_INODE_CLUSTER_SIZE(mp));
}
/*
* For creating a link to an inode:
* the parent directory inode: inode size
@ -220,6 +234,7 @@ xfs_calc_link_reservation(
struct xfs_mount *mp)
{
return XFS_DQUOT_LOGRES(mp) +
xfs_calc_iunlink_remove_reservation(mp) +
MAX((xfs_calc_inode_res(mp, 2) +
xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp),
XFS_FSB_TO_B(mp, 1))),
@ -410,9 +425,9 @@ xfs_calc_ifree_reservation(
{
return XFS_DQUOT_LOGRES(mp) +
xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(1, XFS_FSB_TO_B(mp, 1)) +
max_t(uint, XFS_FSB_TO_B(mp, 1), XFS_INODE_CLUSTER_SIZE(mp)) +
xfs_calc_iunlink_remove_reservation(mp) +
xfs_calc_buf_res(1, 0) +
xfs_calc_buf_res(2 + XFS_IALLOC_BLOCKS(mp) +
mp->m_in_maxlevels, 0) +