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[XFS] Combine the XFS and Linux inodes 

To avoid issues with different lifecycles of XFS and Linux inodes, embedd
the linux inode inside the XFS inode. This means that the linux inode has
the same lifecycle as the XFS inode, even when it has been released by the
OS. XFS inodes don't live much longer than this (a short stint in reclaim
at most), so there isn't significant memory usage penalties here.

Version 3 o kill xfs_icount()

Version 2 o remove unused commented out code from xfs_iget(). o kill
useless cast in VFS_I()

SGI-PV: 988141

SGI-Modid: xfs-linux-melb:xfs-kern:32323a

Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
This commit is contained in:
David Chinner 2008-10-30 17:36:14 +11:00 committed by Lachlan McIlroy
parent 8290c35f87
commit bf904248a2
7 changed files with 109 additions and 204 deletions
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17
fs/xfs/linux-2.6/xfs_iops.c
View File

@ -64,14 +64,14 @@ xfs_synchronize_atime(
{
struct inode *inode = VFS_I(ip);
if (inode) {
if (!(inode->i_state & I_CLEAR)) {
ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
}
}
/*
* If the linux inode exists, mark it dirty.
* If the linux inode is valid, mark it dirty.
* Used when commiting a dirty inode into a transaction so that
* the inode will get written back by the linux code
*/
@ -81,7 +81,7 @@ xfs_mark_inode_dirty_sync(
{
struct inode *inode = VFS_I(ip);
if (inode)
if (!(inode->i_state & (I_WILL_FREE|I_FREEING|I_CLEAR)))
mark_inode_dirty_sync(inode);
}
@ -766,12 +766,21 @@ xfs_diflags_to_iflags(
* When reading existing inodes from disk this is called directly
* from xfs_iget, when creating a new inode it is called from
* xfs_ialloc after setting up the inode.
*
* We are always called with an uninitialised linux inode here.
* We need to initialise the necessary fields and take a reference
* on it.
*/
void
xfs_setup_inode(
struct xfs_inode *ip)
{
struct inode *inode = ip->i_vnode;
struct inode *inode = &ip->i_vnode;
inode->i_ino = ip->i_ino;
inode->i_state = I_NEW|I_LOCK;
inode_add_to_lists(ip->i_mount->m_super, inode);
ASSERT(atomic_read(&inode->i_count) == 1);
inode->i_mode = ip->i_d.di_mode;
inode->i_nlink = ip->i_d.di_nlink;

47
fs/xfs/linux-2.6/xfs_super.c
View File

@ -72,7 +72,6 @@
static struct quotactl_ops xfs_quotactl_operations;
static struct super_operations xfs_super_operations;
static kmem_zone_t *xfs_vnode_zone;
static kmem_zone_t *xfs_ioend_zone;
mempool_t *xfs_ioend_pool;
@ -867,29 +866,24 @@ xfsaild_stop(
}
/* Catch misguided souls that try to use this interface on XFS */
STATIC struct inode *
xfs_fs_alloc_inode(
struct super_block *sb)
{
return kmem_zone_alloc(xfs_vnode_zone, KM_SLEEP);
BUG();
}
/*
* we need to provide an empty inode free function to prevent
* the generic code from trying to free our combined inode.
*/
STATIC void
xfs_fs_destroy_inode(
struct inode *inode)
struct inode *inode)
{
kmem_zone_free(xfs_vnode_zone, inode);
}
STATIC void
xfs_fs_inode_init_once(
void *vnode)
{
inode_init_once((struct inode *)vnode);
}
/*
* Slab object creation initialisation for the XFS inode.
* This covers only the idempotent fields in the XFS inode;
@ -898,13 +892,18 @@ xfs_fs_inode_init_once(
* fields in the xfs inode that left in the initialise state
* when freeing the inode.
*/
void
xfs_inode_init_once(
STATIC void
xfs_fs_inode_init_once(
void *inode)
{
struct xfs_inode *ip = inode;
memset(ip, 0, sizeof(struct xfs_inode));
/* vfs inode */
inode_init_once(VFS_I(ip));
/* xfs inode */
atomic_set(&ip->i_iocount, 0);
atomic_set(&ip->i_pincount, 0);
spin_lock_init(&ip->i_flags_lock);
@ -975,8 +974,6 @@ xfs_fs_clear_inode(
if (xfs_reclaim(ip))
panic("%s: cannot reclaim 0x%p\n", __func__, inode);
}
ASSERT(XFS_I(inode) == NULL);
}
STATIC void
@ -1829,16 +1826,10 @@ xfs_free_trace_bufs(void)
STATIC int __init
xfs_init_zones(void)
{
xfs_vnode_zone = kmem_zone_init_flags(sizeof(struct inode), "xfs_vnode",
KM_ZONE_HWALIGN | KM_ZONE_RECLAIM |
KM_ZONE_SPREAD,
xfs_fs_inode_init_once);
if (!xfs_vnode_zone)
goto out;
xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
if (!xfs_ioend_zone)
goto out_destroy_vnode_zone;
goto out;
xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
xfs_ioend_zone);
@ -1854,6 +1845,7 @@ xfs_init_zones(void)
"xfs_bmap_free_item");
if (!xfs_bmap_free_item_zone)
goto out_destroy_log_ticket_zone;
xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
"xfs_btree_cur");
if (!xfs_btree_cur_zone)
@ -1901,8 +1893,8 @@ xfs_init_zones(void)
xfs_inode_zone =
kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
KM_ZONE_HWALIGN | KM_ZONE_RECLAIM |
KM_ZONE_SPREAD, xfs_inode_init_once);
KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
xfs_fs_inode_init_once);
if (!xfs_inode_zone)
goto out_destroy_efi_zone;
@ -1950,8 +1942,6 @@ xfs_init_zones(void)
mempool_destroy(xfs_ioend_pool);
out_destroy_ioend_zone:
kmem_zone_destroy(xfs_ioend_zone);
out_destroy_vnode_zone:
kmem_zone_destroy(xfs_vnode_zone);
out:
return -ENOMEM;
}
@ -1976,7 +1966,6 @@ xfs_destroy_zones(void)
kmem_zone_destroy(xfs_log_ticket_zone);
mempool_destroy(xfs_ioend_pool);
kmem_zone_destroy(xfs_ioend_zone);
kmem_zone_destroy(xfs_vnode_zone);
}

15
fs/xfs/linux-2.6/xfs_vnode.c
View File

@ -84,25 +84,12 @@ vn_ioerror(
#ifdef XFS_INODE_TRACE
/*
* Reference count of Linux inode if present, -1 if the xfs_inode
* has no associated Linux inode.
*/
static inline int xfs_icount(struct xfs_inode *ip)
{
struct inode *inode = VFS_I(ip);
if (inode)
return atomic_read(&inode->i_count);
return -1;
}
#define KTRACE_ENTER(ip, vk, s, line, ra) \
ktrace_enter( (ip)->i_trace, \
/* 0 */ (void *)(__psint_t)(vk), \
/* 1 */ (void *)(s), \
/* 2 */ (void *)(__psint_t) line, \
/* 3 */ (void *)(__psint_t)xfs_icount(ip), \
/* 3 */ (void *)(__psint_t)atomic_read(&VFS_I(ip)->i_count), \
/* 4 */ (void *)(ra), \
/* 5 */ NULL, \
/* 6 */ (void *)(__psint_t)current_cpu(), \

169
fs/xfs/xfs_iget.c
View File

@ -44,77 +44,65 @@
*/
static int
xfs_iget_cache_hit(
struct inode *inode,
struct xfs_perag *pag,
struct xfs_inode *ip,
int flags,
int lock_flags) __releases(pag->pag_ici_lock)
{
struct xfs_mount *mp = ip->i_mount;
struct inode *old_inode;
int error = 0;
/*
* If INEW is set this inode is being set up
* If IRECLAIM is set this inode is being torn down
* Pause and try again.
*/
if (xfs_iflags_test(ip, XFS_INEW)) {
if (xfs_iflags_test(ip, (XFS_INEW|XFS_IRECLAIM))) {
error = EAGAIN;
XFS_STATS_INC(xs_ig_frecycle);
goto out_error;
}
old_inode = ip->i_vnode;
if (old_inode == NULL) {
/*
* If IRECLAIM is set this inode is
* on its way out of the system,
* we need to pause and try again.
*/
if (xfs_iflags_test(ip, XFS_IRECLAIM)) {
error = EAGAIN;
XFS_STATS_INC(xs_ig_frecycle);
goto out_error;
}
ASSERT(xfs_iflags_test(ip, XFS_IRECLAIMABLE));
/* If IRECLAIMABLE is set, we've torn down the vfs inode part */
if (xfs_iflags_test(ip, XFS_IRECLAIMABLE)) {
/*
* If lookup is racing with unlink, then we
* should return an error immediately so we
* don't remove it from the reclaim list and
* potentially leak the inode.
* If lookup is racing with unlink, then we should return an
* error immediately so we don't remove it from the reclaim
* list and potentially leak the inode.
*/
if ((ip->i_d.di_mode == 0) &&
!(flags & XFS_IGET_CREATE)) {
if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) {
error = ENOENT;
goto out_error;
}
xfs_itrace_exit_tag(ip, "xfs_iget.alloc");
/*
* We need to re-initialise the VFS inode as it has been
* 'freed' by the VFS. Do this here so we can deal with
* errors cleanly, then tag it so it can be set up correctly
* later.
*/
if (!inode_init_always(mp->m_super, VFS_I(ip))) {
error = ENOMEM;
goto out_error;
}
xfs_iflags_set(ip, XFS_INEW);
xfs_iflags_clear(ip, XFS_IRECLAIMABLE);
read_unlock(&pag->pag_ici_lock);
XFS_MOUNT_ILOCK(mp);
list_del_init(&ip->i_reclaim);
XFS_MOUNT_IUNLOCK(mp);
} else if (inode != old_inode) {
/* The inode is being torn down, pause and
* try again.
*/
if (old_inode->i_state & (I_FREEING | I_CLEAR)) {
error = EAGAIN;
XFS_STATS_INC(xs_ig_frecycle);
goto out_error;
}
/* Chances are the other vnode (the one in the inode) is being torn
* down right now, and we landed on top of it. Question is, what do
* we do? Unhook the old inode and hook up the new one?
*/
cmn_err(CE_PANIC,
"xfs_iget_core: ambiguous vns: vp/0x%p, invp/0x%p",
old_inode, inode);
} else if (!igrab(VFS_I(ip))) {
/* If the VFS inode is being torn down, pause and try again. */
error = EAGAIN;
XFS_STATS_INC(xs_ig_frecycle);
goto out_error;
} else {
/* we've got a live one */
read_unlock(&pag->pag_ici_lock);
}
@ -215,11 +203,11 @@ out_destroy:
/*
* Look up an inode by number in the given file system.
* The inode is looked up in the cache held in each AG.
* If the inode is found in the cache, attach it to the provided
* vnode.
* If the inode is found in the cache, initialise the vfs inode
* if necessary.
*
* If it is not in core, read it in from the file system's device,
* add it to the cache and attach the provided vnode.
* add it to the cache and initialise the vfs inode.
*
* The inode is locked according to the value of the lock_flags parameter.
* This flag parameter indicates how and if the inode's IO lock and inode lock
@ -236,9 +224,8 @@ out_destroy:
* bno -- the block number starting the buffer containing the inode,
* if known (as by bulkstat), else 0.
*/
STATIC int
xfs_iget_core(
struct inode *inode,
int
xfs_iget(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_ino_t ino,
@ -269,7 +256,7 @@ again:
ip = radix_tree_lookup(&pag->pag_ici_root, agino);
if (ip) {
error = xfs_iget_cache_hit(inode, pag, ip, flags, lock_flags);
error = xfs_iget_cache_hit(pag, ip, flags, lock_flags);
if (error)
goto out_error_or_again;
} else {
@ -283,23 +270,16 @@ again:
}
xfs_put_perag(mp, pag);
ASSERT(ip->i_df.if_ext_max ==
XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t));
xfs_iflags_set(ip, XFS_IMODIFIED);
*ipp = ip;
/*
* Set up the Linux with the Linux inode.
*/
ip->i_vnode = inode;
inode->i_private = ip;
ASSERT(ip->i_df.if_ext_max ==
XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t));
/*
* If we have a real type for an on-disk inode, we can set ops(&unlock)
* now. If it's a new inode being created, xfs_ialloc will handle it.
*/
if (ip->i_d.di_mode != 0)
if (xfs_iflags_test(ip, XFS_INEW) && ip->i_d.di_mode != 0)
xfs_setup_inode(ip);
return 0;
@ -313,75 +293,6 @@ out_error_or_again:
}
/*
* The 'normal' internal xfs_iget, if needed it will
* 'allocate', or 'get', the vnode.
*/
int
xfs_iget(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_ino_t ino,
uint flags,
uint lock_flags,
xfs_inode_t **ipp,
xfs_daddr_t bno)
{
struct inode *inode;
xfs_inode_t *ip;
int error;
XFS_STATS_INC(xs_ig_attempts);
retry:
inode = iget_locked(mp->m_super, ino);
if (!inode)
/* If we got no inode we are out of memory */
return ENOMEM;
if (inode->i_state & I_NEW) {
XFS_STATS_INC(vn_active);
XFS_STATS_INC(vn_alloc);
error = xfs_iget_core(inode, mp, tp, ino, flags,
lock_flags, ipp, bno);
if (error) {
make_bad_inode(inode);
if (inode->i_state & I_NEW)
unlock_new_inode(inode);
iput(inode);
}
return error;
}
/*
* If the inode is not fully constructed due to
* filehandle mismatches wait for the inode to go
* away and try again.
*
* iget_locked will call __wait_on_freeing_inode
* to wait for the inode to go away.
*/
if (is_bad_inode(inode)) {
iput(inode);
delay(1);
goto retry;
}
ip = XFS_I(inode);
if (!ip) {
iput(inode);
delay(1);
goto retry;
}
if (lock_flags != 0)
xfs_ilock(ip, lock_flags);
XFS_STATS_INC(xs_ig_found);
*ipp = ip;
return 0;
}
/*
* Look for the inode corresponding to the given ino in the hash table.
* If it is there and its i_transp pointer matches tp, return it.
@ -481,14 +392,6 @@ xfs_ireclaim(xfs_inode_t *ip)
*/
XFS_QM_DQDETACH(ip->i_mount, ip);
/*
* Pull our behavior descriptor from the vnode chain.
*/
if (ip->i_vnode) {
ip->i_vnode->i_private = NULL;
ip->i_vnode = NULL;
}
/*
* Free all memory associated with the inode.
*/

43
fs/xfs/xfs_inode.c
View File

@ -813,6 +813,16 @@ xfs_inode_alloc(
ASSERT(!spin_is_locked(&ip->i_flags_lock));
ASSERT(list_empty(&ip->i_reclaim));
/*
* initialise the VFS inode here to get failures
* out of the way early.
*/
if (!inode_init_always(mp->m_super, VFS_I(ip))) {
kmem_zone_free(xfs_inode_zone, ip);
return NULL;
}
/* initialise the xfs inode */
ip->i_ino = ino;
ip->i_mount = mp;
ip->i_blkno = 0;
@ -1086,6 +1096,7 @@ xfs_ialloc(
uint flags;
int error;
timespec_t tv;
int filestreams = 0;
/*
* Call the space management code to pick
@ -1093,9 +1104,8 @@ xfs_ialloc(
*/
error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode, okalloc,
ialloc_context, call_again, &ino);
if (error != 0) {
if (error)
return error;
}
if (*call_again || ino == NULLFSINO) {
*ipp = NULL;
return 0;
@ -1109,9 +1119,8 @@ xfs_ialloc(
*/
error = xfs_trans_iget(tp->t_mountp, tp, ino,
XFS_IGET_CREATE, XFS_ILOCK_EXCL, &ip);
if (error != 0) {
if (error)
return error;
}
ASSERT(ip != NULL);
ip->i_d.di_mode = (__uint16_t)mode;
@ -1192,13 +1201,12 @@ xfs_ialloc(
flags |= XFS_ILOG_DEV;
break;
case S_IFREG:
if (pip && xfs_inode_is_filestream(pip)) {
error = xfs_filestream_associate(pip, ip);
if (error < 0)
return -error;
if (!error)
xfs_iflags_set(ip, XFS_IFILESTREAM);
}
/*
* we can't set up filestreams until after the VFS inode
* is set up properly.
*/
if (pip && xfs_inode_is_filestream(pip))
filestreams = 1;
/* fall through */
case S_IFDIR:
if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) {
@ -1264,6 +1272,15 @@ xfs_ialloc(
/* now that we have an i_mode we can setup inode ops and unlock */
xfs_setup_inode(ip);
/* now we have set up the vfs inode we can associate the filestream */
if (filestreams) {
error = xfs_filestream_associate(pip, ip);
if (error < 0)
return -error;
if (!error)
xfs_iflags_set(ip, XFS_IFILESTREAM);
}
*ipp = ip;
return 0;
}
@ -2650,6 +2667,10 @@ xfs_idestroy_fork(
* It must free the inode itself and any buffers allocated for
* if_extents/if_data and if_broot. It must also free the lock
* associated with the inode.
*
* Note: because we don't initialise everything on reallocation out
* of the zone, we must ensure we nullify everything correctly before
* freeing the structure.
*/
void
xfs_idestroy(

9
fs/xfs/xfs_inode.h
View File

@ -236,7 +236,6 @@ typedef struct xfs_inode {
/* Inode linking and identification information. */
struct xfs_mount *i_mount; /* fs mount struct ptr */
struct list_head i_reclaim; /* reclaim list */
struct inode *i_vnode; /* vnode backpointer */
struct xfs_dquot *i_udquot; /* user dquot */
struct xfs_dquot *i_gdquot; /* group dquot */
@ -271,6 +270,10 @@ typedef struct xfs_inode {
xfs_fsize_t i_size; /* in-memory size */
xfs_fsize_t i_new_size; /* size when write completes */
atomic_t i_iocount; /* outstanding I/O count */
/* VFS inode */
struct inode i_vnode; /* embedded VFS inode */
/* Trace buffers per inode. */
#ifdef XFS_INODE_TRACE
struct ktrace *i_trace; /* general inode trace */
@ -298,13 +301,13 @@ typedef struct xfs_inode {
/* Convert from vfs inode to xfs inode */
static inline struct xfs_inode *XFS_I(struct inode *inode)
{
return (struct xfs_inode *)inode->i_private;
return container_of(inode, struct xfs_inode, i_vnode);
}
/* convert from xfs inode to vfs inode */
static inline struct inode *VFS_I(struct xfs_inode *ip)
{
return (struct inode *)ip->i_vnode;
return &ip->i_vnode;
}
/*

13
fs/xfs/xfs_vnodeops.c
View File

@ -2833,6 +2833,7 @@ xfs_reclaim(
if (!ip->i_update_core && (ip->i_itemp == NULL)) {
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_iflock(ip);
xfs_iflags_set(ip, XFS_IRECLAIMABLE);
return xfs_finish_reclaim(ip, 1, XFS_IFLUSH_DELWRI_ELSE_SYNC);
} else {
xfs_mount_t *mp = ip->i_mount;
@ -2841,8 +2842,6 @@ xfs_reclaim(
XFS_MOUNT_ILOCK(mp);
spin_lock(&ip->i_flags_lock);
__xfs_iflags_set(ip, XFS_IRECLAIMABLE);
VFS_I(ip)->i_private = NULL;
ip->i_vnode = NULL;
spin_unlock(&ip->i_flags_lock);
list_add_tail(&ip->i_reclaim, &mp->m_del_inodes);
XFS_MOUNT_IUNLOCK(mp);
@ -2857,10 +2856,6 @@ xfs_finish_reclaim(
int sync_mode)
{
xfs_perag_t *pag = xfs_get_perag(ip->i_mount, ip->i_ino);
struct inode *vp = VFS_I(ip);
if (vp && VN_BAD(vp))
goto reclaim;
/* The hash lock here protects a thread in xfs_iget_core from
* racing with us on linking the inode back with a vnode.
@ -2870,7 +2865,7 @@ xfs_finish_reclaim(
write_lock(&pag->pag_ici_lock);
spin_lock(&ip->i_flags_lock);
if (__xfs_iflags_test(ip, XFS_IRECLAIM) ||
(!__xfs_iflags_test(ip, XFS_IRECLAIMABLE) && vp == NULL)) {
!__xfs_iflags_test(ip, XFS_IRECLAIMABLE)) {
spin_unlock(&ip->i_flags_lock);
write_unlock(&pag->pag_ici_lock);
if (locked) {
@ -2904,15 +2899,13 @@ xfs_finish_reclaim(
* In the case of a forced shutdown we rely on xfs_iflush() to
* wait for the inode to be unpinned before returning an error.
*/
if (xfs_iflush(ip, sync_mode) == 0) {
if (!is_bad_inode(VFS_I(ip)) && xfs_iflush(ip, sync_mode) == 0) {
/* synchronize with xfs_iflush_done */
xfs_iflock(ip);
xfs_ifunlock(ip);
}
xfs_iunlock(ip, XFS_ILOCK_EXCL);
reclaim:
xfs_ireclaim(ip);
return 0;
}