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Subject[PATCH 05/19] orangefs: hold i_lock during inode_getattr
Date
This should be a no-op now.  When inode writeback works, this will
prevent a getattr from overwriting inode data while an inode is
transitioning to dirty.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
---
fs/orangefs/inode.c | 4 ++--
fs/orangefs/orangefs-utils.c | 33 +++++++++++++++++++++++----------
2 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c
index 067fd7111103..ec3996a61f92 100644
--- a/fs/orangefs/inode.c
+++ b/fs/orangefs/inode.c
@@ -253,8 +253,8 @@ int orangefs_getattr(const struct path *path, struct kstat *stat,
struct inode *inode = path->dentry->d_inode;

gossip_debug(GOSSIP_INODE_DEBUG,
- "orangefs_getattr: called on %pd\n",
- path->dentry);
+ "orangefs_getattr: called on %pd mask %u\n",
+ path->dentry, request_mask);

ret = orangefs_inode_getattr(inode,
request_mask & STATX_SIZE ? ORANGEFS_GETATTR_SIZE : 0);
diff --git a/fs/orangefs/orangefs-utils.c b/fs/orangefs/orangefs-utils.c
index 76f18a3494c7..d44cbe96719a 100644
--- a/fs/orangefs/orangefs-utils.c
+++ b/fs/orangefs/orangefs-utils.c
@@ -280,12 +280,17 @@ int orangefs_inode_getattr(struct inode *inode, int flags)
loff_t inode_size;
int ret, type;

- gossip_debug(GOSSIP_UTILS_DEBUG, "%s: called on inode %pU\n", __func__,
- get_khandle_from_ino(inode));
+ gossip_debug(GOSSIP_UTILS_DEBUG, "%s: called on inode %pU flags %d\n",
+ __func__, get_khandle_from_ino(inode), flags);

+ spin_lock(&inode->i_lock);
/* Must have all the attributes in the mask and be within cache time. */
- if (!flags && time_before(jiffies, orangefs_inode->getattr_time))
+ if ((!flags && time_before(jiffies, orangefs_inode->getattr_time)) ||
+ inode->i_state & I_DIRTY) {
+ spin_unlock(&inode->i_lock);
return 0;
+ }
+ spin_unlock(&inode->i_lock);

new_op = op_alloc(ORANGEFS_VFS_OP_GETATTR);
if (!new_op)
@@ -306,13 +311,23 @@ int orangefs_inode_getattr(struct inode *inode, int flags)
if (ret != 0)
goto out;

+ spin_lock(&inode->i_lock);
+ /* Must have all the attributes in the mask and be within cache time. */
+ if ((!flags && time_before(jiffies, orangefs_inode->getattr_time)) ||
+ inode->i_state & I_DIRTY) {
+ gossip_debug(GOSSIP_UTILS_DEBUG, "%s: in cache or dirty\n",
+ __func__);
+ ret = 0;
+ goto out_unlock;
+ }
+
if (!(flags & ORANGEFS_GETATTR_NEW)) {
ret = orangefs_inode_is_stale(inode,
&new_op->downcall.resp.getattr.attributes,
new_op->downcall.resp.getattr.link_target);
if (ret) {
ret = -ESTALE;
- goto out;
+ goto out_unlock;
}
}

@@ -328,19 +343,15 @@ int orangefs_inode_getattr(struct inode *inode, int flags)
inode->i_size = inode_size;
inode->i_blkbits = ffs(new_op->downcall.resp.getattr.
attributes.blksize);
- spin_lock(&inode->i_lock);
inode->i_bytes = inode_size;
inode->i_blocks =
(inode_size + 512 - inode_size % 512)/512;
- spin_unlock(&inode->i_lock);
}
break;
case S_IFDIR:
if (flags) {
inode->i_size = PAGE_SIZE;
- spin_lock(&inode->i_lock);
inode_set_bytes(inode, inode->i_size);
- spin_unlock(&inode->i_lock);
}
set_nlink(inode, 1);
break;
@@ -353,7 +364,7 @@ int orangefs_inode_getattr(struct inode *inode, int flags)
ORANGEFS_NAME_MAX);
if (ret == -E2BIG) {
ret = -EIO;
- goto out;
+ goto out_unlock;
}
inode->i_link = orangefs_inode->link_target;
}
@@ -363,7 +374,7 @@ int orangefs_inode_getattr(struct inode *inode, int flags)
/* XXX: ESTALE? This is what is done if it is not new. */
orangefs_make_bad_inode(inode);
ret = -ESTALE;
- goto out;
+ goto out_unlock;
}

inode->i_uid = make_kuid(&init_user_ns, new_op->
@@ -387,6 +398,8 @@ int orangefs_inode_getattr(struct inode *inode, int flags)
orangefs_inode->getattr_time = jiffies +
orangefs_getattr_timeout_msecs*HZ/1000;
ret = 0;
+out_unlock:
+ spin_unlock(&inode->i_lock);
out:
op_release(new_op);
return ret;
--
2.19.0
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