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authorPranith Kumar K <pkarampu@redhat.com>2016-03-19 11:40:26 +0530
committerPranith Kumar Karampuri <pkarampu@redhat.com>2016-06-03 06:23:47 -0700
commit0c2fb5d80e248f8b49e0ed13de0165c30429a072 (patch)
tree333aa0b62b66ccaf364477b3dc5dba3cb7ec8878 /libglusterfs
parent8697bc0b5e59fff3330e6cacc3693b3ca6459d04 (diff)
cluster/afr: Don't let NFS cache stat after writes.
Problem: Afr does post-ops after write but the stat buffer it unwinds is at the time of write, so if nfs client caches this, it will see different ctime when it does stat on it after post-op is done. From NFS client's perspective it thinks the file is changed. Tar which depends on this to be correct keeps giving 'file changed as we read it' warning. If Afr instead has to choose to unwind after post-op, eager-lock, delayed-post-op will have to be disabled which will lead to bad performance for all write usecases. Fix: Don't let client cache stat after write. >Change-Id: Ic6062acc6e5cdd97a9c83c56bd529ec83cee8a23 >BUG: 1302948 >Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> >Signed-off-by: Anuradha Talur <atalur@redhat.com> >Reviewed-on: http://review.gluster.org/13785 >Smoke: Gluster Build System <jenkins@build.gluster.com> >NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> >CentOS-regression: Gluster Build System <jenkins@build.gluster.com> >Reviewed-by: Niels de Vos <ndevos@redhat.com> BUG: 1312721 Change-Id: I42a5d524bcf2a2034fe48ee8454812ca26a98c37 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/14454 NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.com> Smoke: Gluster Build System <jenkins@build.gluster.com>
Diffstat (limited to 'libglusterfs')
-rw-r--r--libglusterfs/src/common-utils.c23
-rw-r--r--libglusterfs/src/common-utils.h6
2 files changed, 29 insertions, 0 deletions
diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index 40d9b63..337d5ed 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -4076,3 +4076,26 @@ list_node_del (struct list_node *node)
GF_FREE (node);
}
+gf_boolean_t
+gf_is_zero_filled_stat (struct iatt *buf)
+{
+ if (!buf)
+ return 1;
+
+ /* Do not use st_dev because it is transformed to store the xlator id
+ * in place of the device number. Do not use st_ino because by this time
+ * we've already mapped the root ino to 1 so it is not guaranteed to be
+ * 0.
+ */
+ if ((buf->ia_nlink == 0) && (buf->ia_ctime == 0))
+ return 1;
+
+ return 0;
+}
+
+void
+gf_zero_fill_stat (struct iatt *buf)
+{
+ buf->ia_nlink = 0;
+ buf->ia_ctime = 0;
+}
diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index ca9ce78..bfcc480 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -790,4 +790,10 @@ gf_nwrite (int fd, const void *buf, size_t count);
void _mask_cancellation (void);
void _unmask_cancellation (void);
+gf_boolean_t
+gf_is_zero_filled_stat (struct iatt *buf);
+
+void
+gf_zero_fill_stat (struct iatt *buf);
+
#endif /* _COMMON_UTILS_H */