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ioctl_ficlonerange.2, ioctl_fideduperange.2: Mention same-filesystem requirement
Mention that FICLONE, FICLONERANGE, and FIDEDUPERANGE all require both files to reside on the same filesystem. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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.I dest_fd
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.I dest_fd
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file by sharing the underlying storage, which is faster than making a separate
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file by sharing the underlying storage, which is faster than making a separate
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physical copy of the data.
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physical copy of the data.
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Both files must reside within the same filesystem.
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If a file write should occur to a shared region,
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If a file write should occur to a shared region,
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the filesystem must ensure that the changes remain private to the file being
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the filesystem must ensure that the changes remain private to the file being
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written.
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written.
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.B dest_fd
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.B dest_fd
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file by sharing the underlying storage if the file data is identical
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file by sharing the underlying storage if the file data is identical
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("deduplication").
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("deduplication").
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Both files must reside within the same filesystem.
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This reduces storage consumption by allowing the filesystem
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This reduces storage consumption by allowing the filesystem
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to store one shared copy of the data.
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to store one shared copy of the data.
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If a file write should occur to a shared
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If a file write should occur to a shared
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