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feaa7bba02
This patch fixes the way we have been dealing with unlinked, but still open files. It removes all limits (other than memory for inodes, as per every other filesystem) on numbers of these which we can support on GFS2. It also means that (like other fs) its the responsibility of the last process to close the file to deallocate the storage, rather than the person who did the unlinking. Note that with GFS2, those two events might take place on different nodes. Also there are a number of other changes: o We use the Linux inode subsystem as it was intended to be used, wrt allocating GFS2 inodes o The Linux inode cache is now the point which we use for local enforcement of only holding one copy of the inode in core at once (previous to this we used the glock layer). o We no longer use the unlinked "special" file. We just ignore it completely. This makes unlinking more efficient. o We now use the 4th block allocation state. The previously unused state is used to track unlinked but still open inodes. o gfs2_inoded is no longer needed o Several fields are now no longer needed (and removed) from the in core struct gfs2_inode o Several fields are no longer needed (and removed) from the in core superblock There are a number of future possible optimisations and clean ups which have been made possible by this patch. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
58 lines
2 KiB
C
58 lines
2 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*/
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#ifndef __INODE_DOT_H__
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#define __INODE_DOT_H__
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static inline int gfs2_is_stuffed(struct gfs2_inode *ip)
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{
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return !ip->i_di.di_height;
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}
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static inline int gfs2_is_jdata(struct gfs2_inode *ip)
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{
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return ip->i_di.di_flags & GFS2_DIF_JDATA;
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}
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static inline int gfs2_is_dir(struct gfs2_inode *ip)
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{
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return S_ISDIR(ip->i_di.di_mode);
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}
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void gfs2_inode_attr_in(struct gfs2_inode *ip);
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void gfs2_inode_attr_out(struct gfs2_inode *ip);
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struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned type);
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struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum);
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int gfs2_inode_refresh(struct gfs2_inode *ip);
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int gfs2_dinode_dealloc(struct gfs2_inode *inode);
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int gfs2_change_nlink(struct gfs2_inode *ip, int diff);
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struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
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int is_root, struct nameidata *nd);
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struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
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unsigned int mode);
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int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
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struct gfs2_inode *ip);
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int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
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struct gfs2_inode *ip);
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int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to);
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int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len);
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int gfs2_glock_nq_atime(struct gfs2_holder *gh);
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int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs);
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int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr);
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int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd);
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struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
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#endif /* __INODE_DOT_H__ */
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