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-rw-r--r--fs/direct-io.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 3aafb3343a65..a0ca9e48e993 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -219,6 +219,27 @@ static inline struct page *dio_get_page(struct dio *dio,
return dio->pages[sdio->head];
}
+/*
+ * 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
* @offset: the byte offset in the file of the completed operation
@@ -290,7 +311,8 @@ static ssize_t dio_complete(struct dio *dio, ssize_t ret, unsigned int flags)
err = invalidate_inode_pages2_range(dio->inode->i_mapping,
offset >> PAGE_SHIFT,
(offset + ret - 1) >> PAGE_SHIFT);
- WARN_ON_ONCE(err);
+ if (err)
+ dio_warn_stale_pagecache(dio->iocb->ki_filp);
}
if (!(dio->flags & DIO_SKIP_DIO_COUNT))