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    SubjectRe: [PATCH 2.6.21] cramfs: add cramfs Linear XIP
    Richard Griffiths (wrs) wrote:
    > One question I have is the difference in the two models. If I understand
    > correctly the filemap_xip expects the ext2 to mount as XIP while the
    > Linear Cramfs only enables XIP for apps that have the sticky bit set.
    > Hence the Application XIP moniker.
    > Does the filemap_xip expect the entire filesystem is XIP?
    The file operations from filemap_xip are only effective if the struct
    file_operations vector refers to them (see ext2_xip_file_operations in
    fs/ext2/file.c as example). In oder to function proper, the
    corresponding address_space_operations vector needs to provide an
    implementation of get_xip_page (see ext2_get_xip_page in
    fs/ext2/xip.c). Both vectors are per inode, one can chose to have XIP
    for individual files in a file system.

    so long,
    Carsten
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