On 11/23/21 5:11 PM, Darrick J. Wong wrote:
On Tue, Nov 16, 2021 at 09:13:36PM -0700, Allison Henderson wrote:
This patch adds the needed routines to create, log and recover logged
extended attribute intents.
Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
Reviewed-by: Chandan Babu R <chandanrlinux@xxxxxxxxx>
---
fs/xfs/libxfs/xfs_defer.c | 1 +
fs/xfs/libxfs/xfs_defer.h | 1 +
fs/xfs/libxfs/xfs_format.h | 9 +-
fs/xfs/xfs_attr_item.c | 362 +++++++++++++++++++++++++++++++++++++
4 files changed, 372 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
index 51574f0371b5..877c0f7ee557 100644
--- a/fs/xfs/libxfs/xfs_defer.c
+++ b/fs/xfs/libxfs/xfs_defer.c
@@ -185,6 +185,7 @@ static const struct xfs_defer_op_type *defer_op_types[] = {
[XFS_DEFER_OPS_TYPE_RMAP] = &xfs_rmap_update_defer_type,
[XFS_DEFER_OPS_TYPE_FREE] = &xfs_extent_free_defer_type,
[XFS_DEFER_OPS_TYPE_AGFL_FREE] = &xfs_agfl_free_defer_type,
+ [XFS_DEFER_OPS_TYPE_ATTR] = &xfs_attr_defer_type,
};
static bool
diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
index fcd23e5cf1ee..114a3a4930a3 100644
--- a/fs/xfs/libxfs/xfs_defer.h
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -19,6 +19,7 @@ enum xfs_defer_ops_type {
XFS_DEFER_OPS_TYPE_RMAP,
XFS_DEFER_OPS_TYPE_FREE,
XFS_DEFER_OPS_TYPE_AGFL_FREE,
+ XFS_DEFER_OPS_TYPE_ATTR,
XFS_DEFER_OPS_TYPE_MAX,
};
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index d665c04e69dd..302b50bc5830 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -388,7 +388,9 @@ xfs_sb_has_incompat_feature(
return (sbp->sb_features_incompat & feature) != 0;
}
-#define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
+#define XFS_SB_FEAT_INCOMPAT_LOG_XATTRS (1 << 0) /* Delayed Attributes */
+#define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
+ (XFS_SB_FEAT_INCOMPAT_LOG_XATTRS)
#define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
static inline bool
xfs_sb_has_incompat_log_feature(
@@ -413,6 +415,11 @@ xfs_sb_add_incompat_log_features(
sbp->sb_features_log_incompat |= features;
}
+static inline bool xfs_sb_version_haslogxattrs(struct xfs_sb *sbp)
+{
+ return xfs_sb_is_v5(sbp) && (sbp->sb_features_log_incompat &
+ XFS_SB_FEAT_INCOMPAT_LOG_XATTRS);
+}
static inline bool
xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
index 3c0dfb32f2eb..5d0ab9a8504e 100644
--- a/fs/xfs/xfs_attr_item.c
+++ b/fs/xfs/xfs_attr_item.c
@@ -13,6 +13,7 @@
#include "xfs_defer.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
+#include "xfs_bmap_btree.h"
#include "xfs_trans_priv.h"
#include "xfs_log.h"
#include "xfs_inode.h"
@@ -30,6 +31,8 @@
static const struct xfs_item_ops xfs_attri_item_ops;
static const struct xfs_item_ops xfs_attrd_item_ops;
+static struct xfs_attrd_log_item *xfs_trans_get_attrd(struct xfs_trans *tp,
+ struct xfs_attri_log_item *attrip);
static inline struct xfs_attri_log_item *ATTRI_ITEM(struct xfs_log_item *lip)
{
@@ -254,6 +257,163 @@ xfs_attrd_item_release(
xfs_attrd_item_free(attrdp);
}
+/*
+ * Performs one step of an attribute update intent and marks the attrd item
+ * dirty.. An attr operation may be a set or a remove. Note that the
+ * transaction is marked dirty regardless of whether the operation succeeds or
+ * fails to support the ATTRI/ATTRD lifecycle rules.
+ */
+STATIC int
+xfs_trans_attr_finish_update(
You could shorten the name of this to xfs_xattri_finish_update.
Sure, that sounds fine if folks prefer that name
+ struct xfs_delattr_context *dac,
+ struct xfs_attrd_log_item *attrdp,
+ struct xfs_buf **leaf_bp,
+ uint32_t op_flags)
+{
+ struct xfs_da_args *args = dac->da_args;
+ unsigned int op = op_flags &
+ XFS_ATTR_OP_FLAGS_TYPE_MASK;
+ int error;
+
+ switch (op) {
+ case XFS_ATTR_OP_FLAGS_SET:
+ error = xfs_attr_set_iter(dac, leaf_bp);
+ break;
+ case XFS_ATTR_OP_FLAGS_REMOVE:
+ ASSERT(XFS_IFORK_Q(args->dp));
+ error = xfs_attr_remove_iter(dac);
+ break;
+ default:
+ error = -EFSCORRUPTED;
+ break;
+ }
+
+ /*
+ * Mark the transaction dirty, even on error. This ensures the
+ * transaction is aborted, which:
+ *
+ * 1.) releases the ATTRI and frees the ATTRD
+ * 2.) shuts down the filesystem
+ */
+ args->trans->t_flags |= XFS_TRANS_DIRTY;
+
+ /*
+ * attr intent/done items are null when delayed attributes are disabled
logged attributes?
yes, logged attributes is more accurate i think
+ */
+ if (attrdp)
+ set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);
+
+ return error;
+}
+
+/* Log an attr to the intent item. */
+STATIC void
+xfs_attr_log_item(
+ struct xfs_trans *tp,
+ struct xfs_attri_log_item *attrip,
+ struct xfs_attr_item *attr)
+{
+ struct xfs_attri_log_format *attrp;
+
+ tp->t_flags |= XFS_TRANS_DIRTY;
+ set_bit(XFS_LI_DIRTY, &attrip->attri_item.li_flags);
+
+ /*
+ * At this point the xfs_attr_item has been constructed, and we've
+ * created the log intent. Fill in the attri log item and log format
+ * structure with fields from this xfs_attr_item
+ */
+ attrp = &attrip->attri_format;
+ attrp->alfi_ino = attr->xattri_dac.da_args->dp->i_ino;
+ attrp->alfi_op_flags = attr->xattri_op_flags;
+ attrp->alfi_value_len = attr->xattri_dac.da_args->valuelen;
+ attrp->alfi_name_len = attr->xattri_dac.da_args->namelen;
+ attrp->alfi_attr_flags = attr->xattri_dac.da_args->attr_filter;
+
+ attrip->attri_name = (void *)attr->xattri_dac.da_args->name;
+ attrip->attri_value = attr->xattri_dac.da_args->value;
+ attrip->attri_name_len = attr->xattri_dac.da_args->namelen;
+ attrip->attri_value_len = attr->xattri_dac.da_args->valuelen;
+}
+
+/* Get an ATTRI. */
+static struct xfs_log_item *
+xfs_attr_create_intent(
+ struct xfs_trans *tp,
+ struct list_head *items,
+ unsigned int count,
+ bool sort)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+ struct xfs_attri_log_item *attrip;
+ struct xfs_attr_item *attr;
+
+ ASSERT(count == 1);
+
+ if (!xfs_sb_version_haslogxattrs(&mp->m_sb))
+ return NULL;
+
+ attrip = xfs_attri_init(mp, 0);
+ if (attrip == NULL)
+ return NULL;
Hm. To answer my question from before -- if we can't allocate memory
for the xfs_attri_log_item, we silently fall back to not logging xattr
updates. That's not good, especially since the fs is configured for
LARP mode. At least for this callsite, the allocation should be
GFP_NOFAIL to avoid this.
(For recovery, which AFAICT is the only caller to make large
allocations, I think it's ok to omit GFP_NOFAIL since that shouldn't
happen, and having to rerun log recovery isn't the end of the world...)
Sure, I can plumb in a alloc_flags parameter here
+
+ xfs_trans_add_item(tp, &attrip->attri_item);
+ list_for_each_entry(attr, items, xattri_list)
+ xfs_attr_log_item(tp, attrip, attr);
+ return &attrip->attri_item;
+}
+
+/* Process an attr. */
+STATIC int
+xfs_attr_finish_item(
+ struct xfs_trans *tp,
+ struct xfs_log_item *done,
+ struct list_head *item,
+ struct xfs_btree_cur **state)
+{
+ struct xfs_attr_item *attr;
+ struct xfs_attrd_log_item *done_item = NULL;
+ int error;
+ struct xfs_delattr_context *dac;
+
+ attr = container_of(item, struct xfs_attr_item, xattri_list);
+ dac = &attr->xattri_dac;
+ if (done)
+ done_item = ATTRD_ITEM(done);
+
+ /*
+ * Always reset trans after EAGAIN cycle
+ * since the transaction is new
+ */
+ dac->da_args->trans = tp;
+
+ error = xfs_trans_attr_finish_update(dac, done_item, &dac->leaf_bp,
+ attr->xattri_op_flags);
+ if (error != -EAGAIN)
+ kmem_free(attr);
+
+ return error;
+}
+
+/* Abort all pending ATTRs. */
+STATIC void
+xfs_attr_abort_intent(
+ struct xfs_log_item *intent)
+{
+ xfs_attri_release(ATTRI_ITEM(intent));
+}
+
+/* Cancel an attr */
+STATIC void
+xfs_attr_cancel_item(
+ struct list_head *item)
+{
+ struct xfs_attr_item *attr;
+
+ attr = container_of(item, struct xfs_attr_item, xattri_list);
+ kmem_free(attr);
+}
+
STATIC xfs_lsn_t
xfs_attri_item_committed(
struct xfs_log_item *lip,
@@ -311,6 +471,160 @@ xfs_attri_validate(
return xfs_verify_ino(mp, attrp->alfi_ino);
}
+/*
+ * Process an attr intent item that was recovered from the log. We need to
+ * delete the attr that it describes.
+ */
+STATIC int
+xfs_attri_item_recover(
+ struct xfs_log_item *lip,
+ struct list_head *capture_list)
+{
+ struct xfs_attri_log_item *attrip = ATTRI_ITEM(lip);
+ struct xfs_attr_item *attr;
+ struct xfs_mount *mp = lip->li_mountp;
+ struct xfs_inode *ip;
+ struct xfs_da_args *args;
+ struct xfs_trans *tp;
+ struct xfs_trans_res tres;
+ struct xfs_attri_log_format *attrp;
+ int error, ret = 0;
+ int total;
+ int local;
+ struct xfs_attrd_log_item *done_item = NULL;
+
+ /*
+ * First check the validity of the attr described by the ATTRI. If any
+ * are bad, then assume that all are bad and just toss the ATTRI.
+ */
+ attrp = &attrip->attri_format;
+ if (!xfs_attri_validate(mp, attrp))
+ return -EFSCORRUPTED;
+
+ error = xlog_recover_iget(mp, attrp->alfi_ino, &ip);
+ if (error)
+ return error;
+
+ attr = kmem_zalloc(sizeof(struct xfs_attr_item) +
+ sizeof(struct xfs_da_args), KM_NOFS);
+ args = (struct xfs_da_args *)(attr + 1);
+
+ attr->xattri_dac.da_args = args;
+ attr->xattri_op_flags = attrp->alfi_op_flags;
+
+ args->dp = ip;
+ args->geo = mp->m_attr_geo;
+ args->op_flags = attrp->alfi_op_flags;
+ args->whichfork = XFS_ATTR_FORK;
+ args->name = attrip->attri_name;
+ args->namelen = attrp->alfi_name_len;
+ args->hashval = xfs_da_hashname(args->name, args->namelen);
+ args->attr_filter = attrp->alfi_attr_flags;
+
+ if (attrp->alfi_op_flags == XFS_ATTR_OP_FLAGS_SET) {
+ args->value = attrip->attri_value;
+ args->valuelen = attrp->alfi_value_len;
+ args->total = xfs_attr_calc_size(args, &local);
+
+ tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
+ M_RES(mp)->tr_attrsetrt.tr_logres *
+ args->total;
+ tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
+ tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
+ total = args->total;
+ } else {
+ tres = M_RES(mp)->tr_attrrm;
+ total = XFS_ATTRRM_SPACE_RES(mp);
+ }
+ error = xfs_trans_alloc(mp, &tres, total, 0, XFS_TRANS_RESERVE, &tp);
+ if (error)
+ goto out;
+
+ args->trans = tp;
+ done_item = xfs_trans_get_attrd(tp, attrip);
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+
+ ret = xfs_trans_attr_finish_update(&attr->xattri_dac, done_item,
+ &attr->xattri_dac.leaf_bp,
+ attrp->alfi_op_flags);
+ if (ret == -EAGAIN) {
+ /* There's more work to do, so add it to this transaction */
+ xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_ATTR, &attr->xattri_list);
Set attr = NULL here so that we don't free it at the end of the
function. Just in case some day one of these other functions also
starts returning -EAGAIN.Well, even when we dont get -EAGAIN, we still need attr for the buffer
unlock right? I think we added that for the capture buffers patches we
added in the last review.
+ } else
+ error = ret;
+
+ if (error) {
+ xfs_trans_cancel(tp);
+ goto out_unlock;
+ }
+
+ error = xfs_defer_ops_capture_and_commit(tp, capture_list);
+
+out_unlock:
+ if (attr->xattri_dac.leaf_bp)
+ xfs_buf_relse(attr->xattri_dac.leaf_bp);
+
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_irele(ip);
+out:
+ if (ret != -EAGAIN)
+ kmem_free(attr);
+ return error;
+}
+
+/* Re-log an intent item to push the log tail forward. */
+static struct xfs_log_item *
+xfs_attri_item_relog(
+ struct xfs_log_item *intent,
+ struct xfs_trans *tp)
+{
+ struct xfs_attrd_log_item *attrdp;
+ struct xfs_attri_log_item *old_attrip;
+ struct xfs_attri_log_item *new_attrip;
+ struct xfs_attri_log_format *new_attrp;
+ struct xfs_attri_log_format *old_attrp;
+ int buffer_size;
+
+ old_attrip = ATTRI_ITEM(intent);
+ old_attrp = &old_attrip->attri_format;
+ buffer_size = old_attrp->alfi_value_len + old_attrp->alfi_name_len;
+
+ tp->t_flags |= XFS_TRANS_DIRTY;
+ attrdp = xfs_trans_get_attrd(tp, old_attrip);
+ set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);
+
+ new_attrip = xfs_attri_init(tp->t_mountp, buffer_size);
+ new_attrp = &new_attrip->attri_format;
+
+ new_attrp->alfi_ino = old_attrp->alfi_ino;
+ new_attrp->alfi_op_flags = old_attrp->alfi_op_flags;
+ new_attrp->alfi_value_len = old_attrp->alfi_value_len;
+ new_attrp->alfi_name_len = old_attrp->alfi_name_len;
+ new_attrp->alfi_attr_flags = old_attrp->alfi_attr_flags;
+
+ new_attrip->attri_name_len = old_attrip->attri_name_len;
+ new_attrip->attri_name = ((char *)new_attrip) +
+ sizeof(struct xfs_attri_log_item);
+ memcpy(new_attrip->attri_name, old_attrip->attri_name,
+ new_attrip->attri_name_len);
+
+ new_attrip->attri_value_len = old_attrip->attri_value_len;
+ if (new_attrip->attri_value_len > 0) {
+ new_attrip->attri_value = new_attrip->attri_name +
+ new_attrip->attri_name_len;
+
+ memcpy(new_attrip->attri_value, old_attrip->attri_value,
+ new_attrip->attri_value_len);
+ }
+
+ xfs_trans_add_item(tp, &new_attrip->attri_item);
+ set_bit(XFS_LI_DIRTY, &new_attrip->attri_item.li_flags);
+
+ return &new_attrip->attri_item;
+}
+
STATIC int
xlog_recover_attri_commit_pass2(
struct xlog *log,
@@ -377,6 +691,52 @@ xlog_recover_attri_commit_pass2(
return 0;
}
+/*
+ * This routine is called to allocate an "attr free done" log item.
+ */
+static struct xfs_attrd_log_item *
+xfs_trans_get_attrd(struct xfs_trans *tp,
+ struct xfs_attri_log_item *attrip)
+{
+ struct xfs_attrd_log_item *attrdp;
+ uint size;
+
+ ASSERT(tp != NULL);
+
+ size = sizeof(struct xfs_attrd_log_item);
+ attrdp = kmem_zalloc(size, 0);
The xattrd items really should get their own slab cache.
Sure, I can add a caches for attrdp and attrip
+
+ xfs_log_item_init(tp->t_mountp, &attrdp->attrd_item, XFS_LI_ATTRD,
+ &xfs_attrd_item_ops);
+ attrdp->attrd_attrip = attrip;
+ attrdp->attrd_format.alfd_alf_id = attrip->attri_format.alfi_id;
+
+ xfs_trans_add_item(tp, &attrdp->attrd_item);
+ return attrdp;
+}
+
+/* Get an ATTRD so we can process all the attrs. */
+static struct xfs_log_item *
+xfs_attr_create_done(
+ struct xfs_trans *tp,
+ struct xfs_log_item *intent,
+ unsigned int count)
+{
+ if (!intent)
+ return NULL;
+
+ return &xfs_trans_get_attrd(tp, ATTRI_ITEM(intent))->attrd_item;
+}
xfs_trans_get_attrd could be combined into this function.
Ok, will collapse that down
This series is coming along nicely! I think with these last few
things fixed, it's ready to go.
Great, sounds good. Thanks for the reviews!
Allison
--D
+
+const struct xfs_defer_op_type xfs_attr_defer_type = {
+ .max_items = 1,
+ .create_intent = xfs_attr_create_intent,
+ .abort_intent = xfs_attr_abort_intent,
+ .create_done = xfs_attr_create_done,
+ .finish_item = xfs_attr_finish_item,
+ .cancel_item = xfs_attr_cancel_item,
+};
+
/*
* This routine is called when an ATTRD format structure is found in a committed
* transaction in the log. Its purpose is to cancel the corresponding ATTRI if
@@ -410,7 +770,9 @@ static const struct xfs_item_ops xfs_attri_item_ops = {
.iop_unpin = xfs_attri_item_unpin,
.iop_committed = xfs_attri_item_committed,
.iop_release = xfs_attri_item_release,
+ .iop_recover = xfs_attri_item_recover,
.iop_match = xfs_attri_item_match,
+ .iop_relog = xfs_attri_item_relog,
};
const struct xlog_recover_item_ops xlog_attri_item_ops = {
--
2.25.1
