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    SubjectRe: [PATCH 0/5][TAKE2] fallocate system call
    On May 14, 2007  18:59 +0530, Amit K. Arora wrote:
    > asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len)
    >
    > fd: The descriptor of the open file.
    >
    > mode*: This specifies the behavior of the system call. Currently the
    > system call supports two modes - FA_ALLOCATE and FA_DEALLOCATE.
    > FA_ALLOCATE: Applications can use this mode to preallocate blocks to
    > a given file (specified by fd). This mode changes the file size if
    > the preallocation is done beyond the EOF. It also updates the
    > ctime/mtime in the inode of the corresponding file, marking a
    > successfull allocation.
    > FA_DEALLOCATE: This mode can be used by applications to deallocate the
    > previously preallocated blocks. This also may change the file size
    > and the ctime/mtime.
    > * New modes might get added in future. One such new mode which is
    > already under discussion is FA_PREALLOCATE, which when used will
    > preallocate space but will not change the filesize and [cm]time.
    > Since the semantics of this new mode is not clear and agreed upon yet,
    > this patchset does not implement it currently.
    >
    > offset: This is the offset in bytes, from where the preallocation should
    > start.
    >
    > len: This is the number of bytes requested for preallocation (from
    > offset).

    What is the return value? I'd hope it is the number of bytes preallocated,
    in case of interrupted preallocation for whatever reason (interrupt, out of
    space, etc) like a regular write(2) call. In this case the return type needs
    to also be an loff_t to match @len.

    Cheers, Andreas
    --
    Andreas Dilger
    Principal Software Engineer
    Cluster File Systems, Inc.

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