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Merge branch 'xfs-rename-whiteout' into for-next

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Conflicts:
	fs/xfs/xfs_inode.c
This commit is contained in:
Dave Chinner 2015-03-25 14:29:13 +11:00
parent 88e8fda99a 7dcf5c3e45
commit d41bb03444
2 changed files with 244 additions and 176 deletions
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418
fs/xfs/xfs_inode.c
View file

@ -391,15 +391,14 @@ xfs_lock_inumorder(int lock_mode, int subclass)
}
/*
* The following routine will lock n inodes in exclusive mode.
* We assume the caller calls us with the inodes in i_ino order.
* The following routine will lock n inodes in exclusive mode. We assume the
* caller calls us with the inodes in i_ino order.
*
* We need to detect deadlock where an inode that we lock
* is in the AIL and we start waiting for another inode that is locked
* by a thread in a long running transaction (such as truncate). This can
* result in deadlock since the long running trans might need to wait
* for the inode we just locked in order to push the tail and free space
* in the log.
* We need to detect deadlock where an inode that we lock is in the AIL and we
* start waiting for another inode that is locked by a thread in a long running
* transaction (such as truncate). This can result in deadlock since the long
* running trans might need to wait for the inode we just locked in order to
* push the tail and free space in the log.
*/
void
xfs_lock_inodes(
@ -410,30 +409,27 @@ xfs_lock_inodes(
int attempts = 0, i, j, try_lock;
xfs_log_item_t *lp;
ASSERT(ips && (inodes >= 2)); /* we need at least two */
/* currently supports between 2 and 5 inodes */
ASSERT(ips && inodes >= 2 && inodes <= 5);
try_lock = 0;
i = 0;
again:
for (; i < inodes; i++) {
ASSERT(ips[i]);
if (i && (ips[i] == ips[i-1])) /* Already locked */
if (i && (ips[i] == ips[i - 1])) /* Already locked */
continue;
/*
* If try_lock is not set yet, make sure all locked inodes
* are not in the AIL.
* If any are, set try_lock to be used later.
* If try_lock is not set yet, make sure all locked inodes are
* not in the AIL. If any are, set try_lock to be used later.
*/
if (!try_lock) {
for (j = (i - 1); j >= 0 && !try_lock; j--) {
lp = (xfs_log_item_t *)ips[j]->i_itemp;
if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
if (lp && (lp->li_flags & XFS_LI_IN_AIL))
try_lock++;
}
}
}
@ -443,51 +439,42 @@ again:
* we can't get any, we must release all we have
* and try again.
*/
if (try_lock) {
/* try_lock must be 0 if i is 0. */
/*
* try_lock means we have an inode locked
* that is in the AIL.
*/
ASSERT(i != 0);
if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
attempts++;
/*
* Unlock all previous guys and try again.
* xfs_iunlock will try to push the tail
* if the inode is in the AIL.
*/
for(j = i - 1; j >= 0; j--) {
/*
* Check to see if we've already
* unlocked this one.
* Not the first one going back,
* and the inode ptr is the same.
*/
if ((j != (i - 1)) && ips[j] ==
ips[j+1])
continue;
xfs_iunlock(ips[j], lock_mode);
}
if ((attempts % 5) == 0) {
delay(1); /* Don't just spin the CPU */
#ifdef DEBUG
xfs_lock_delays++;
#endif
}
i = 0;
try_lock = 0;
goto again;
}
} else {
if (!try_lock) {
xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
continue;
}
/* try_lock means we have an inode locked that is in the AIL. */
ASSERT(i != 0);
if (xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i)))
continue;
/*
* Unlock all previous guys and try again. xfs_iunlock will try
* to push the tail if the inode is in the AIL.
*/
attempts++;
for (j = i - 1; j >= 0; j--) {
/*
* Check to see if we've already unlocked this one. Not
* the first one going back, and the inode ptr is the
* same.
*/
if (j != (i - 1) && ips[j] == ips[j + 1])
continue;
xfs_iunlock(ips[j], lock_mode);
}
if ((attempts % 5) == 0) {
delay(1); /* Don't just spin the CPU */
#ifdef DEBUG
xfs_lock_delays++;
#endif
}
i = 0;
try_lock = 0;
goto again;
}
#ifdef DEBUG
@ -2681,19 +2668,22 @@ xfs_remove(
/*
* Enter all inodes for a rename transaction into a sorted array.
*/
#define __XFS_SORT_INODES 5
STATIC void
xfs_sort_for_rename(
xfs_inode_t *dp1, /* in: old (source) directory inode */
xfs_inode_t *dp2, /* in: new (target) directory inode */
xfs_inode_t *ip1, /* in: inode of old entry */
xfs_inode_t *ip2, /* in: inode of new entry, if it
already exists, NULL otherwise. */
xfs_inode_t **i_tab,/* out: array of inode returned, sorted */
int *num_inodes) /* out: number of inodes in array */
struct xfs_inode *dp1, /* in: old (source) directory inode */
struct xfs_inode *dp2, /* in: new (target) directory inode */
struct xfs_inode *ip1, /* in: inode of old entry */
struct xfs_inode *ip2, /* in: inode of new entry */
struct xfs_inode *wip, /* in: whiteout inode */
struct xfs_inode **i_tab,/* out: sorted array of inodes */
int *num_inodes) /* in/out: inodes in array */
{
xfs_inode_t *temp;
int i, j;
ASSERT(*num_inodes == __XFS_SORT_INODES);
memset(i_tab, 0, *num_inodes * sizeof(struct xfs_inode *));
/*
* i_tab contains a list of pointers to inodes. We initialize
* the table here & we'll sort it. We will then use it to
@ -2701,25 +2691,24 @@ xfs_sort_for_rename(
*
* Note that the table may contain duplicates. e.g., dp1 == dp2.
*/
i_tab[0] = dp1;
i_tab[1] = dp2;
i_tab[2] = ip1;
if (ip2) {
*num_inodes = 4;
i_tab[3] = ip2;
} else {
*num_inodes = 3;
i_tab[3] = NULL;
}
i = 0;
i_tab[i++] = dp1;
i_tab[i++] = dp2;
i_tab[i++] = ip1;
if (ip2)
i_tab[i++] = ip2;
if (wip)
i_tab[i++] = wip;
*num_inodes = i;
/*
* Sort the elements via bubble sort. (Remember, there are at
* most 4 elements to sort, so this is adequate.)
* most 5 elements to sort, so this is adequate.)
*/
for (i = 0; i < *num_inodes; i++) {
for (j = 1; j < *num_inodes; j++) {
if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
temp = i_tab[j];
struct xfs_inode *temp = i_tab[j];
i_tab[j] = i_tab[j-1];
i_tab[j-1] = temp;
}
@ -2727,6 +2716,31 @@ xfs_sort_for_rename(
}
}
static int
xfs_finish_rename(
struct xfs_trans *tp,
struct xfs_bmap_free *free_list)
{
int committed = 0;
int error;
/*
* If this is a synchronous mount, make sure that the rename transaction
* goes to disk before returning to the user.
*/
if (tp->t_mountp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
xfs_trans_set_sync(tp);
error = xfs_bmap_finish(&tp, free_list, &committed);
if (error) {
xfs_bmap_cancel(free_list);
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
return error;
}
return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
}
/*
* xfs_cross_rename()
*
@ -2755,14 +2769,14 @@ xfs_cross_rename(
ip2->i_ino,
first_block, free_list, spaceres);
if (error)
goto out;
goto out_trans_abort;
/* Swap inode number for dirent in second parent */
error = xfs_dir_replace(tp, dp2, name2,
ip1->i_ino,
first_block, free_list, spaceres);
if (error)
goto out;
goto out_trans_abort;
/*
* If we're renaming one or more directories across different parents,
@ -2777,16 +2791,16 @@ xfs_cross_rename(
dp1->i_ino, first_block,
free_list, spaceres);
if (error)
goto out;
goto out_trans_abort;
/* transfer ip2 ".." reference to dp1 */
if (!S_ISDIR(ip1->i_d.di_mode)) {
error = xfs_droplink(tp, dp2);
if (error)
goto out;
goto out_trans_abort;
error = xfs_bumplink(tp, dp1);
if (error)
goto out;
goto out_trans_abort;
}
/*
@ -2804,16 +2818,16 @@ xfs_cross_rename(
dp2->i_ino, first_block,
free_list, spaceres);
if (error)
goto out;
goto out_trans_abort;
/* transfer ip1 ".." reference to dp2 */
if (!S_ISDIR(ip2->i_d.di_mode)) {
error = xfs_droplink(tp, dp1);
if (error)
goto out;
goto out_trans_abort;
error = xfs_bumplink(tp, dp2);
if (error)
goto out;
goto out_trans_abort;
}
/*
@ -2841,66 +2855,108 @@ xfs_cross_rename(
}
xfs_trans_ichgtime(tp, dp1, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
xfs_trans_log_inode(tp, dp1, XFS_ILOG_CORE);
out:
return xfs_finish_rename(tp, free_list);
out_trans_abort:
xfs_bmap_cancel(free_list);
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
return error;
}
/*
* xfs_rename_alloc_whiteout()
*
* Return a referenced, unlinked, unlocked inode that that can be used as a
* whiteout in a rename transaction. We use a tmpfile inode here so that if we
* crash between allocating the inode and linking it into the rename transaction
* recovery will free the inode and we won't leak it.
*/
static int
xfs_rename_alloc_whiteout(
struct xfs_inode *dp,
struct xfs_inode **wip)
{
struct xfs_inode *tmpfile;
int error;
error = xfs_create_tmpfile(dp, NULL, S_IFCHR | WHITEOUT_MODE, &tmpfile);
if (error)
return error;
/* Satisfy xfs_bumplink that this is a real tmpfile */
xfs_finish_inode_setup(tmpfile);
VFS_I(tmpfile)->i_state |= I_LINKABLE;
*wip = tmpfile;
return 0;
}
/*
* xfs_rename
*/
int
xfs_rename(
xfs_inode_t *src_dp,
struct xfs_name *src_name,
xfs_inode_t *src_ip,
xfs_inode_t *target_dp,
struct xfs_name *target_name,
xfs_inode_t *target_ip,
unsigned int flags)
struct xfs_inode *src_dp,
struct xfs_name *src_name,
struct xfs_inode *src_ip,
struct xfs_inode *target_dp,
struct xfs_name *target_name,
struct xfs_inode *target_ip,
unsigned int flags)
{
xfs_trans_t *tp = NULL;
xfs_mount_t *mp = src_dp->i_mount;
int new_parent; /* moving to a new dir */
int src_is_directory; /* src_name is a directory */
int error;
xfs_bmap_free_t free_list;
xfs_fsblock_t first_block;
int cancel_flags;
int committed;
xfs_inode_t *inodes[4];
int spaceres;
int num_inodes;
struct xfs_mount *mp = src_dp->i_mount;
struct xfs_trans *tp;
struct xfs_bmap_free free_list;
xfs_fsblock_t first_block;
struct xfs_inode *wip = NULL; /* whiteout inode */
struct xfs_inode *inodes[__XFS_SORT_INODES];
int num_inodes = __XFS_SORT_INODES;
int new_parent = (src_dp != target_dp);
int src_is_directory = S_ISDIR(src_ip->i_d.di_mode);
int cancel_flags = 0;
int spaceres;
int error;
trace_xfs_rename(src_dp, target_dp, src_name, target_name);
new_parent = (src_dp != target_dp);
src_is_directory = S_ISDIR(src_ip->i_d.di_mode);
if ((flags & RENAME_EXCHANGE) && !target_ip)
return -EINVAL;
xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
/*
* If we are doing a whiteout operation, allocate the whiteout inode
* we will be placing at the target and ensure the type is set
* appropriately.
*/
if (flags & RENAME_WHITEOUT) {
ASSERT(!(flags & (RENAME_NOREPLACE | RENAME_EXCHANGE)));
error = xfs_rename_alloc_whiteout(target_dp, &wip);
if (error)
return error;
/* setup target dirent info as whiteout */
src_name->type = XFS_DIR3_FT_CHRDEV;
}
xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, wip,
inodes, &num_inodes);
xfs_bmap_init(&free_list, &first_block);
tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_rename, spaceres, 0);
if (error == -ENOSPC) {
spaceres = 0;
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_rename, 0, 0);
}
if (error) {
xfs_trans_cancel(tp, 0);
goto std_return;
}
if (error)
goto out_trans_cancel;
cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
/*
* Attach the dquots to the inodes
*/
error = xfs_qm_vop_rename_dqattach(inodes);
if (error) {
xfs_trans_cancel(tp, cancel_flags);
goto std_return;
}
if (error)
goto out_trans_cancel;
/*
* Lock all the participating inodes. Depending upon whether
@ -2921,6 +2977,8 @@ xfs_rename(
xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
if (target_ip)
xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
if (wip)
xfs_trans_ijoin(tp, wip, XFS_ILOCK_EXCL);
/*
* If we are using project inheritance, we only allow renames
@ -2930,24 +2988,16 @@ xfs_rename(
if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
(xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) {
error = -EXDEV;
goto error_return;
goto out_trans_cancel;
}
/*
* Handle RENAME_EXCHANGE flags
*/
if (flags & RENAME_EXCHANGE) {
if (target_ip == NULL) {
error = -EINVAL;
goto error_return;
}
error = xfs_cross_rename(tp, src_dp, src_name, src_ip,
target_dp, target_name, target_ip,
&free_list, &first_block, spaceres);
if (error)
goto abort_return;
goto finish_rename;
}
xfs_bmap_init(&free_list, &first_block);
/* RENAME_EXCHANGE is unique from here on. */
if (flags & RENAME_EXCHANGE)
return xfs_cross_rename(tp, src_dp, src_name, src_ip,
target_dp, target_name, target_ip,
&free_list, &first_block, spaceres);
/*
* Set up the target.
@ -2960,7 +3010,7 @@ xfs_rename(
if (!spaceres) {
error = xfs_dir_canenter(tp, target_dp, target_name);
if (error)
goto error_return;
goto out_trans_cancel;
}
/*
* If target does not exist and the rename crosses
@ -2971,9 +3021,9 @@ xfs_rename(
src_ip->i_ino, &first_block,
&free_list, spaceres);
if (error == -ENOSPC)
goto error_return;
goto out_bmap_cancel;
if (error)
goto abort_return;
goto out_trans_abort;
xfs_trans_ichgtime(tp, target_dp,
XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
@ -2981,7 +3031,7 @@ xfs_rename(
if (new_parent && src_is_directory) {
error = xfs_bumplink(tp, target_dp);
if (error)
goto abort_return;
goto out_trans_abort;
}
} else { /* target_ip != NULL */
/*
@ -2996,7 +3046,7 @@ xfs_rename(
if (!(xfs_dir_isempty(target_ip)) ||
(target_ip->i_d.di_nlink > 2)) {
error = -EEXIST;
goto error_return;
goto out_trans_cancel;
}
}
@ -3013,7 +3063,7 @@ xfs_rename(
src_ip->i_ino,
&first_block, &free_list, spaceres);
if (error)
goto abort_return;
goto out_trans_abort;
xfs_trans_ichgtime(tp, target_dp,
XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
@ -3024,7 +3074,7 @@ xfs_rename(
*/
error = xfs_droplink(tp, target_ip);
if (error)
goto abort_return;
goto out_trans_abort;
if (src_is_directory) {
/*
@ -3032,7 +3082,7 @@ xfs_rename(
*/
error = xfs_droplink(tp, target_ip);
if (error)
goto abort_return;
goto out_trans_abort;
}
} /* target_ip != NULL */
@ -3049,7 +3099,7 @@ xfs_rename(
&first_block, &free_list, spaceres);
ASSERT(error != -EEXIST);
if (error)
goto abort_return;
goto out_trans_abort;
}
/*
@ -3075,49 +3125,67 @@ xfs_rename(
*/
error = xfs_droplink(tp, src_dp);
if (error)
goto abort_return;
goto out_trans_abort;
}
error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
/*
* For whiteouts, we only need to update the source dirent with the
* inode number of the whiteout inode rather than removing it
* altogether.
*/
if (wip) {
error = xfs_dir_replace(tp, src_dp, src_name, wip->i_ino,
&first_block, &free_list, spaceres);
} else
error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
&first_block, &free_list, spaceres);
if (error)
goto abort_return;
goto out_trans_abort;
/*
* For whiteouts, we need to bump the link count on the whiteout inode.
* This means that failures all the way up to this point leave the inode
* on the unlinked list and so cleanup is a simple matter of dropping
* the remaining reference to it. If we fail here after bumping the link
* count, we're shutting down the filesystem so we'll never see the
* intermediate state on disk.
*/
if (wip) {
ASSERT(wip->i_d.di_nlink == 0);
error = xfs_bumplink(tp, wip);
if (error)
goto out_trans_abort;
error = xfs_iunlink_remove(tp, wip);
if (error)
goto out_trans_abort;
xfs_trans_log_inode(tp, wip, XFS_ILOG_CORE);
/*
* Now we have a real link, clear the "I'm a tmpfile" state
* flag from the inode so it doesn't accidentally get misused in
* future.
*/
VFS_I(wip)->i_state &= ~I_LINKABLE;
}
xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
if (new_parent)
xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
finish_rename:
/*
* If this is a synchronous mount, make sure that the
* rename transaction goes to disk before returning to
* the user.
*/
if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
xfs_trans_set_sync(tp);
}
error = xfs_finish_rename(tp, &free_list);
if (wip)
IRELE(wip);
return error;
error = xfs_bmap_finish(&tp, &free_list, &committed);
if (error) {
xfs_bmap_cancel(&free_list);
xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
XFS_TRANS_ABORT));
goto std_return;
}
/*
* trans_commit will unlock src_ip, target_ip & decrement
* the vnode references.
*/
return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
abort_return:
out_trans_abort:
cancel_flags |= XFS_TRANS_ABORT;
error_return:
out_bmap_cancel:
xfs_bmap_cancel(&free_list);
out_trans_cancel:
xfs_trans_cancel(tp, cancel_flags);
std_return:
if (wip)
IRELE(wip);
return error;
}

2
fs/xfs/xfs_iops.c
View file

@ -394,7 +394,7 @@ xfs_vn_rename(
struct xfs_name oname;
struct xfs_name nname;
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
return -EINVAL;
/* if we are exchanging files, we need to set i_mode of both files */