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    Subject[PATCH 4.14 210/293] mm: add filemap_fdatawait_range_keep_errors()
    Date
    From: Ross Zwisler <zwisler@chromium.org>

    commit aa0bfcd939c30617385ffa28682c062d78050eba upstream.

    In the spirit of filemap_fdatawait_range() and
    filemap_fdatawait_keep_errors(), introduce
    filemap_fdatawait_range_keep_errors() which both takes a range upon
    which to wait and does not clear errors from the address space.

    Signed-off-by: Ross Zwisler <zwisler@google.com>
    Signed-off-by: Theodore Ts'o <tytso@mit.edu>
    Reviewed-by: Jan Kara <jack@suse.cz>
    Cc: stable@vger.kernel.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    include/linux/fs.h | 2 ++
    mm/filemap.c | 22 ++++++++++++++++++++++
    2 files changed, 24 insertions(+)

    --- a/include/linux/fs.h
    +++ b/include/linux/fs.h
    @@ -2580,6 +2580,8 @@ extern int filemap_flush(struct address_
    extern int filemap_fdatawait_keep_errors(struct address_space *mapping);
    extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
    loff_t lend);
    +extern int filemap_fdatawait_range_keep_errors(struct address_space *mapping,
    + loff_t start_byte, loff_t end_byte);

    static inline int filemap_fdatawait(struct address_space *mapping)
    {
    --- a/mm/filemap.c
    +++ b/mm/filemap.c
    @@ -464,6 +464,28 @@ int filemap_fdatawait_range(struct addre
    EXPORT_SYMBOL(filemap_fdatawait_range);

    /**
    + * filemap_fdatawait_range_keep_errors - wait for writeback to complete
    + * @mapping: address space structure to wait for
    + * @start_byte: offset in bytes where the range starts
    + * @end_byte: offset in bytes where the range ends (inclusive)
    + *
    + * Walk the list of under-writeback pages of the given address space in the
    + * given range and wait for all of them. Unlike filemap_fdatawait_range(),
    + * this function does not clear error status of the address space.
    + *
    + * Use this function if callers don't handle errors themselves. Expected
    + * call sites are system-wide / filesystem-wide data flushers: e.g. sync(2),
    + * fsfreeze(8)
    + */
    +int filemap_fdatawait_range_keep_errors(struct address_space *mapping,
    + loff_t start_byte, loff_t end_byte)
    +{
    + __filemap_fdatawait_range(mapping, start_byte, end_byte);
    + return filemap_check_and_keep_errors(mapping);
    +}
    +EXPORT_SYMBOL(filemap_fdatawait_range_keep_errors);
    +
    +/**
    * file_fdatawait_range - wait for writeback to complete
    * @file: file pointing to address space structure to wait for
    * @start_byte: offset in bytes where the range starts

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