diff options
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 21 |
1 files changed, 21 insertions, 0 deletions
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) { |