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fs/direct-io.c: keep dio_warn_stale_pagecache() when CONFIG_BLOCK=n

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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 5a9d929d6e ("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>
This commit is contained in:
Konstantin Khlebnikov 2019-11-30 17:49:44 -08:00 committed by Linus Torvalds
parent 80c1fe9026
commit a92853b674
3 changed files with 26 additions and 22 deletions
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21
fs/direct-io.c
View File

@ -220,27 +220,6 @@ 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
*

6
include/linux/fs.h
View File

@ -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);

21
mm/filemap.c
View File

@ -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)
{