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mm: add filemap_fdatawait_range_keep_errors()
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
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c708b1c6de
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@ -2712,6 +2712,8 @@ extern int filemap_flush(struct address_space *);
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extern int filemap_fdatawait_keep_errors(struct address_space *mapping);
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extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
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loff_t lend);
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extern int filemap_fdatawait_range_keep_errors(struct address_space *mapping,
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loff_t start_byte, loff_t end_byte);
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static inline int filemap_fdatawait(struct address_space *mapping)
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{
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22
mm/filemap.c
22
mm/filemap.c
@ -553,6 +553,28 @@ int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
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}
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EXPORT_SYMBOL(filemap_fdatawait_range);
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/**
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* filemap_fdatawait_range_keep_errors - wait for writeback to complete
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* @mapping: address space structure to wait for
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* @start_byte: offset in bytes where the range starts
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* @end_byte: offset in bytes where the range ends (inclusive)
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*
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* Walk the list of under-writeback pages of the given address space in the
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* given range and wait for all of them. Unlike filemap_fdatawait_range(),
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* this function does not clear error status of the address space.
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*
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* Use this function if callers don't handle errors themselves. Expected
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* call sites are system-wide / filesystem-wide data flushers: e.g. sync(2),
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* fsfreeze(8)
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*/
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int filemap_fdatawait_range_keep_errors(struct address_space *mapping,
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loff_t start_byte, loff_t end_byte)
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{
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__filemap_fdatawait_range(mapping, start_byte, end_byte);
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return filemap_check_and_keep_errors(mapping);
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}
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EXPORT_SYMBOL(filemap_fdatawait_range_keep_errors);
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/**
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* file_fdatawait_range - wait for writeback to complete
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* @file: file pointing to address space structure to wait for
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