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linux/fs/gfs2/dir.h

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[GFS2] The core of GFS2 This patch contains all the core files for GFS2. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-01-16 16:50:04 +00:00
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
[GFS2] Update copyright date to 2006 Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-05-18 19:09:15 +00:00
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
[GFS2] The core of GFS2 This patch contains all the core files for GFS2. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-01-16 16:50:04 +00:00
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
[GFS2] Update copyright, tidy up incore.h As per comments from Jan Engelhardt <jengelh@linux01.gwdg.de> this updates the copyright message to say "version" in full rather than "v.2". Also incore.h has been updated to remove forward structure declarations which are not required. The gfs2_quota_lvb structure has now had endianess annotations added to it. Also quota.c has been updated so that we now store the lvb data locally in endian independant format to avoid needing a structure in host endianess too. As a result the endianess conversions are done as required at various points and thus the conversion routines in lvb.[ch] are no longer required. I've moved the one remaining constant in lvb.h thats used into lm.h and removed the unused lvb.[ch]. I have not changed the HIF_ constants. That is left to a later patch which I hope will unify the gh_flags and gh_iflags fields of the struct gfs2_holder. Cc: Jan Engelhardt <jengelh@linux01.gwdg.de> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-01 15:05:15 +00:00
* of the GNU General Public License version 2.
[GFS2] The core of GFS2 This patch contains all the core files for GFS2. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-01-16 16:50:04 +00:00
*/
#ifndef __DIR_DOT_H__
#define __DIR_DOT_H__
[GFS2] Make headers compile on their own As per Jan Engelhardt's comments, this should make all the headers compile on their own by including and/or declaring structures early. Cc: Jan Engelhardt <jengelh@linux01.gwdg.de> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-05 14:39:21 +00:00
#include <linux/dcache.h>
GFS2: Fix bug in gfs2_lock_fs_check_clean() gfs2_lock_fs_check_clean() should not be calling gfs2_jindex_hold() since it doesn't work like rindex hold, despite the comment. That allows gfs2_jindex_hold() to be moved into ops_fstype.c where it can be made static. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-11-26 12:49:26 +00:00
#include <linux/crc32.h>
[GFS2] Make headers compile on their own As per Jan Engelhardt's comments, this should make all the headers compile on their own by including and/or declaring structures early. Cc: Jan Engelhardt <jengelh@linux01.gwdg.de> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-05 14:39:21 +00:00
struct inode;
struct gfs2_inode;
struct gfs2_inum;
GFS2: Make . and .. qstrs constant Rather than calculating the qstrs for . and .. each time we need them, its better to keep a constant version of these and just refer to them when required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Reviewed-by: Christoph Hellwig <hch@infradead.org>
2010-09-17 11:30:23 +00:00
extern struct inode *gfs2_dir_search(struct inode *dir,
const struct qstr *filename);
extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
const struct gfs2_inode *ip);
extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
GFS2: When adding a new dir entry, inc link count if it is a subdir This adds an increment of the link count when we add a new directory entry, if that entry is itself a directory. This means that we no longer need separate code to perform this operation. Now that both adding and removing directory entries automatically update the parent directory's link count if required, that makes the code shorter and simpler than before. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2011-05-09 12:30:08 +00:00
const struct gfs2_inode *ip);
GFS2: Make gfs2_dir_del update link count when required When we remove an entry from a directory, we can save ourselves some trouble if we know the type of the entry in question, since if it is itself a directory, we can update the link count of the parent at the same time as removing the directory entry. In addition this patch also merges the rmdir and unlink code which was almost identical anyway. This eliminates the calls to remove the . and .. directory entries on each rmdir (not needed since the directory will be deallocated, anyway) which was the only thing preventing passing the dentry to gfs2_dir_del(). The passing of the dentry rather than just the name allows us to figure out the type of the entry which is being removed, and thus adjust the link count when required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2011-05-09 15:42:37 +00:00
extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
GFS2: Make . and .. qstrs constant Rather than calculating the qstrs for . and .. each time we need them, its better to keep a constant version of these and just refer to them when required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Reviewed-by: Christoph Hellwig <hch@infradead.org>
2010-09-17 11:30:23 +00:00
extern int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
filldir_t filldir);
extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
const struct gfs2_inode *nip, unsigned int new_type);
[GFS2] The core of GFS2 This patch contains all the core files for GFS2. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-01-16 16:50:04 +00:00
GFS2: Make . and .. qstrs constant Rather than calculating the qstrs for . and .. each time we need them, its better to keep a constant version of these and just refer to them when required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Reviewed-by: Christoph Hellwig <hch@infradead.org>
2010-09-17 11:30:23 +00:00
extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
[GFS2] The core of GFS2 This patch contains all the core files for GFS2. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-01-16 16:50:04 +00:00
GFS2: Make . and .. qstrs constant Rather than calculating the qstrs for . and .. each time we need them, its better to keep a constant version of these and just refer to them when required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Reviewed-by: Christoph Hellwig <hch@infradead.org>
2010-09-17 11:30:23 +00:00
extern int gfs2_diradd_alloc_required(struct inode *dir,
const struct qstr *filename);
extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
struct buffer_head **bhp);
GFS2: Cache dir hash table in a contiguous buffer This patch adds a cache for the hash table to the directory code in order to help simplify the way in which the hash table is accessed. This is intended to be a first step towards introducing some performance improvements in the directory code. There are two follow ups that I'm hoping to see fairly shortly. One is to simplify the hash table reading code now that we always read the complete hash table, whether we want one entry or all of them. The other is to introduce readahead on the heads of the hash chains which are referred to from the table. The hash table is a maximum of 128k in size, so it is not worth trying to read it in small chunks. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2011-06-15 09:29:37 +00:00
extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
[GFS2] Fix bug in directory code and tidy up Due to a typo, the dir leaf split operation was (for the first split in a directory) writing the new hash vaules at the wrong offset. This is now fixed. Also some other tidy ups are included: - We use GFS2's hash function for dentries (see ops_dentry.c) so that we don't have to keep recalculating the hash values. - A lot of common code is eliminated between the various directory lookup routines. - Better error checking on directory lookup (previously different routines checked for different errors) - The leaf split operation has a couple of redundant operations removed from it, so it should be faster. There is still further scope for further clean ups in the directory code, and readdir in particular could do with slimming down a bit. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-03-20 17:30:04 +00:00
[GFS2] Change all types to uX style This makes all fixed size types have consistent names. Cc: Jan Engelhardt <jengelh@linux01.gwdg.de> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-04 16:49:07 +00:00
static inline u32 gfs2_disk_hash(const char *data, int len)
[GFS2] Further updates to dir and logging code This reduces the size of the directory code by about 3k and gets readdir() to use the functions which were introduced in the previous directory code update. Two memory allocations are merged into one. Eliminates zeroing of some buffers which were never used before they were initialised by other data. There is still scope for further improvement in the directory code. On the logging side, a hand created mutex has been replaced by a standard Linux mutex in the log allocation code. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-03-28 19:14:04 +00:00
{
[GFS2] Directory code style changes As per comments from Jan Engelhardt, remove redundant casts, redundant endian conversions, add a smattering of const and rewrite the dirent_next function in order to avoid as many casts as possible. Cc: Jan Engelhardt <jengelh@linux01.gwdg.de> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-05 13:34:20 +00:00
return crc32_le((u32)~0, data, len) ^ (u32)~0;
[GFS2] Further updates to dir and logging code This reduces the size of the directory code by about 3k and gets readdir() to use the functions which were introduced in the previous directory code update. Two memory allocations are merged into one. Eliminates zeroing of some buffers which were never used before they were initialised by other data. There is still scope for further improvement in the directory code. On the logging side, a hand created mutex has been replaced by a standard Linux mutex in the log allocation code. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-03-28 19:14:04 +00:00
}
static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
{
name->name = fname;
name->len = strlen(fname);
name->hash = gfs2_disk_hash(name->name, name->len);
}
[GFS2] Fix bug in directory code and tidy up Due to a typo, the dir leaf split operation was (for the first split in a directory) writing the new hash vaules at the wrong offset. This is now fixed. Also some other tidy ups are included: - We use GFS2's hash function for dentries (see ops_dentry.c) so that we don't have to keep recalculating the hash values. - A lot of common code is eliminated between the various directory lookup routines. - Better error checking on directory lookup (previously different routines checked for different errors) - The leaf split operation has a couple of redundant operations removed from it, so it should be faster. There is still further scope for further clean ups in the directory code, and readdir in particular could do with slimming down a bit. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-03-20 17:30:04 +00:00
/* N.B. This probably ought to take inum & type as args as well */
static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
{
dent->de_inum.no_addr = cpu_to_be64(0);
dent->de_inum.no_formal_ino = cpu_to_be64(0);
dent->de_hash = cpu_to_be32(name->hash);
dent->de_rec_len = cpu_to_be16(reclen);
dent->de_name_len = cpu_to_be16(name->len);
dent->de_type = cpu_to_be16(0);
memset(dent->__pad, 0, sizeof(dent->__pad));
[GFS2] Directory code style changes As per comments from Jan Engelhardt, remove redundant casts, redundant endian conversions, add a smattering of const and rewrite the dirent_next function in order to avoid as many casts as possible. Cc: Jan Engelhardt <jengelh@linux01.gwdg.de> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-05 13:34:20 +00:00
memcpy(dent + 1, name->name, name->len);
[GFS2] Fix bug in directory code and tidy up Due to a typo, the dir leaf split operation was (for the first split in a directory) writing the new hash vaules at the wrong offset. This is now fixed. Also some other tidy ups are included: - We use GFS2's hash function for dentries (see ops_dentry.c) so that we don't have to keep recalculating the hash values. - A lot of common code is eliminated between the various directory lookup routines. - Better error checking on directory lookup (previously different routines checked for different errors) - The leaf split operation has a couple of redundant operations removed from it, so it should be faster. There is still further scope for further clean ups in the directory code, and readdir in particular could do with slimming down a bit. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-03-20 17:30:04 +00:00
}
[GFS2] The core of GFS2 This patch contains all the core files for GFS2. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-01-16 16:50:04 +00:00
GFS2: Make . and .. qstrs constant Rather than calculating the qstrs for . and .. each time we need them, its better to keep a constant version of these and just refer to them when required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Reviewed-by: Christoph Hellwig <hch@infradead.org>
2010-09-17 11:30:23 +00:00
extern struct qstr gfs2_qdot;
extern struct qstr gfs2_qdotdot;
[GFS2] The core of GFS2 This patch contains all the core files for GFS2. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-01-16 16:50:04 +00:00
#endif /* __DIR_DOT_H__ */
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