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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2019-11-30 17:49:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-12-01 06:29:18 -0800
commita92853b6746fe5ffef20a7c30addf6320561e669 (patch)
tree42fad039d35b3de85db3abd12458e1cc7cf18c35
parent80c1fe902691d3ef4786f9e62e47a0aa0deb8b54 (diff)
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@yandex-team.ru> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Jens Axboe <axboe@kernel.dk> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/direct-io.c21
-rw-r--r--include/linux/fs.h6
-rw-r--r--mm/filemap.c21
3 files changed, 26 insertions, 22 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 9329ced91f1d..0ec4f270139f 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -221,27 +221,6 @@ static inline struct page *dio_get_page(struct dio *dio,
}
/*
- * 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
diff --git a/include/linux/fs.h b/include/linux/fs.h
index ae6c5c37f3ae..eeed80fab36a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3149,7 +3149,6 @@ 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,
@@ -3194,6 +3193,11 @@ static inline void inode_dio_end(struct inode *inode)
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);
diff --git a/mm/filemap.c b/mm/filemap.c
index 288e38199068..189b8f318da2 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3161,6 +3161,27 @@ int pagecache_write_end(struct file *file, struct address_space *mapping,
}
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)
{