[XFS] XFS: ASCII case-insensitive support
Implement ASCII case-insensitive support. It's primary purpose is for supporting existing filesystems that already use this case-insensitive mode migrated from IRIX. But, if you only need ASCII-only case-insensitive support (ie. English only) and will never use another language, then this mode is perfectly adequate. ASCII-CI is implemented by generating hashes based on lower-case letters and doing lower-case compares. It implements a new xfs_nameops vector for doing the hashes and comparisons for all filename operations. To create a filesystem with this CI mode, use: # mkfs.xfs -n version=ci <device> SGI-PV: 981516 SGI-Modid: xfs-linux-melb:xfs-kern:31209a Signed-off-by: Barry Naujok <bnaujok@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org>
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@ -46,10 +46,12 @@ struct xfs_mount;
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#define XFS_SB_VERSION_SECTORBIT 0x0800
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#define XFS_SB_VERSION_EXTFLGBIT 0x1000
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#define XFS_SB_VERSION_DIRV2BIT 0x2000
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#define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */
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#define XFS_SB_VERSION_MOREBITSBIT 0x8000
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#define XFS_SB_VERSION_OKSASHFBITS \
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(XFS_SB_VERSION_EXTFLGBIT | \
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XFS_SB_VERSION_DIRV2BIT)
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XFS_SB_VERSION_DIRV2BIT | \
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XFS_SB_VERSION_BORGBIT)
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#define XFS_SB_VERSION_OKREALFBITS \
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(XFS_SB_VERSION_ATTRBIT | \
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XFS_SB_VERSION_NLINKBIT | \
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@ -437,6 +439,12 @@ static inline int xfs_sb_version_hassector(xfs_sb_t *sbp)
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((sbp)->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
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}
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static inline int xfs_sb_version_hasasciici(xfs_sb_t *sbp)
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{
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return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
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(sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
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}
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static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
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{
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return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
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