The patch titled
Subject: fs/direct-io.c: : keep dio_warn_stale_pagecache() when CONFIG_BLOCK=n
has been added to the -mm tree. Its filename is
fs-keep-dio_warn_stale_pagecache-when-config_block=n.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fs-keep-dio_warn_stale_pagecache-when-config_block%3Dn.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fs-keep-dio_warn_stale_pagecache-when-config_block%3Dn.patch
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------------------------------------------------------
From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Subject: fs/direct-io.c: : keep dio_warn_stale_pagecache() when CONFIG_BLOCK=n
This helper prints warning if direct I/O write failed to invalidate cache,
and set EIO at inode to warn usersapce about possible data corruption.
See also commit 5a9d929d6e13 ("iomap: report collisions between directio
and buffered writes to userspace").
Direct I/O is supported by non-disk filesystems, for example NFS. Thus
generic code needs this even in kernel without CONFIG_BLOCK.
Link: http://lkml.kernel.org/r/157270038074.4812.7980855544557488880.stgit@buzz
Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/direct-io.c | 21 ---------------------
include/linux/fs.h | 6 +++++-
mm/filemap.c | 21 +++++++++++++++++++++
3 files changed, 26 insertions(+), 22 deletions(-)
--- a/fs/direct-io.c~fs-keep-dio_warn_stale_pagecache-when-config_block=n
+++ a/fs/direct-io.c
@@ -221,27 +221,6 @@ static inline struct page *dio_get_page(
}
/*
- * Warn about a page cache invalidation failure during a direct io write.
- */
-void dio_warn_stale_pagecache(struct file *filp)
-{
- static DEFINE_RATELIMIT_STATE(_rs, 86400 * HZ, DEFAULT_RATELIMIT_BURST);
- char pathname[128];
- struct inode *inode = file_inode(filp);
- char *path;
-
- errseq_set(&inode->i_mapping->wb_err, -EIO);
- if (__ratelimit(&_rs)) {
- path = file_path(filp, pathname, sizeof(pathname));
- if (IS_ERR(path))
- path = "(unknown)";
- pr_crit("Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O!\n");
- pr_crit("File: %s PID: %d Comm: %.20s\n", path, current->pid,
- current->comm);
- }
-}
-
-/*
* dio_complete() - called when all DIO BIO I/O has been completed
*
* This drops i_dio_count, lets interested parties know that a DIO operation
--- a/include/linux/fs.h~fs-keep-dio_warn_stale_pagecache-when-config_block=n
+++ a/include/linux/fs.h
@@ -3153,7 +3153,6 @@ enum {
};
void dio_end_io(struct bio *bio);
-void dio_warn_stale_pagecache(struct file *filp);
ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
struct block_device *bdev, struct iov_iter *iter,
@@ -3198,6 +3197,11 @@ static inline void inode_dio_end(struct
wake_up_bit(&inode->i_state, __I_DIO_WAKEUP);
}
+/*
+ * Warn about a page cache invalidation failure diring a direct I/O write.
+ */
+void dio_warn_stale_pagecache(struct file *filp);
+
extern void inode_set_flags(struct inode *inode, unsigned int flags,
unsigned int mask);
--- a/mm/filemap.c~fs-keep-dio_warn_stale_pagecache-when-config_block=n
+++ a/mm/filemap.c
@@ -3161,6 +3161,27 @@ int pagecache_write_end(struct file *fil
}
EXPORT_SYMBOL(pagecache_write_end);
+/*
+ * Warn about a page cache invalidation failure during a direct I/O write.
+ */
+void dio_warn_stale_pagecache(struct file *filp)
+{
+ static DEFINE_RATELIMIT_STATE(_rs, 86400 * HZ, DEFAULT_RATELIMIT_BURST);
+ char pathname[128];
+ struct inode *inode = file_inode(filp);
+ char *path;
+
+ errseq_set(&inode->i_mapping->wb_err, -EIO);
+ if (__ratelimit(&_rs)) {
+ path = file_path(filp, pathname, sizeof(pathname));
+ if (IS_ERR(path))
+ path = "(unknown)";
+ pr_crit("Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O!\n");
+ pr_crit("File: %s PID: %d Comm: %.20s\n", path, current->pid,
+ current->comm);
+ }
+}
+
ssize_t
generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
{
_
Patches currently in -mm which might be from khlebnikov@xxxxxxxxxxxxxx are
fs-remove-redundant-cache-invalidation-after-async-direct-io-write.patch
fs-keep-dio_warn_stale_pagecache-when-config_block=n.patch
fs-warn-if-stale-pagecache-is-left-after-direct-write.patch
mm-swap-piggyback-lru_add_drain_all-calls.patch
mm-vmstat-add-helpers-to-get-vmstat-item-names-for-each-enum-type.patch
mm-vmstat-do-not-use-size-of-vmstat_text-as-count-of-proc-vmstat-items.patch
mm-memcontrol-use-vmstat-names-for-printing-statistics.patch
