On Mon, May 07, 2018 at 09:40:59PM -0700, Allison Henderson wrote:
> Subject: [PATCH 01/21] xfsprogs: Move xfs_attr.h to libxfs
For libxfs patches ported over from the kernel I just leave the subject
as is:
xfs: Move xfs_attr.h to libxfs
so that it's more obvious which patches start the surgery on the
utilities themselves:
mkfs.xfs: Add parent pointer flag to cmd
Also as an aside if you need to create a new patch for something that's
in libxfs but not in the kernel libxfs then I tag it as such:
libxfs: defrobulate the widgets
--D
> This patch moves fs/xfs/xfs_attr.h to fs/xfs/libxfs/xfs_attr.h
> since xfs_attr.c is in libxfs. We will need these later in
> xfsprogs.
>
> Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
> ---
> libxfs/Makefile | 1 +
> libxfs/xfs_attr.h | 157 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 158 insertions(+)
>
> diff --git a/libxfs/Makefile b/libxfs/Makefile
> index 0470f5f..75ce980 100644
> --- a/libxfs/Makefile
> +++ b/libxfs/Makefile
> @@ -21,6 +21,7 @@ HFILES = \
> xfs_ag_resv.h \
> xfs_alloc.h \
> xfs_alloc_btree.h \
> + xfs_attr.h \
> xfs_attr_leaf.h \
> xfs_attr_sf.h \
> xfs_bit.h \
> diff --git a/libxfs/xfs_attr.h b/libxfs/xfs_attr.h
> new file mode 100644
> index 0000000..8abf398
> --- /dev/null
> +++ b/libxfs/xfs_attr.h
> @@ -0,0 +1,157 @@
> +/*
> + * Copyright (c) 2000,2002-2003,2005 Silicon Graphics, Inc.
> + * All Rights Reserved.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it would be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write the Free Software Foundation,
> + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +#ifndef __XFS_ATTR_H__
> +#define __XFS_ATTR_H__
> +
> +struct xfs_inode;
> +struct xfs_da_args;
> +struct xfs_attr_list_context;
> +
> +/*
> + * Large attribute lists are structured around Btrees where all the data
> + * elements are in the leaf nodes. Attribute names are hashed into an int,
> + * then that int is used as the index into the Btree. Since the hashval
> + * of an attribute name may not be unique, we may have duplicate keys.
> + * The internal links in the Btree are logical block offsets into the file.
> + *
> + * Small attribute lists use a different format and are packed as tightly
> + * as possible so as to fit into the literal area of the inode.
> + */
> +
> +/*========================================================================
> + * External interfaces
> + *========================================================================*/
> +
> +
> +#define ATTR_DONTFOLLOW 0x0001 /* -- unused, from IRIX -- */
> +#define ATTR_ROOT 0x0002 /* use attrs in root (trusted) namespace */
> +#define ATTR_TRUST 0x0004 /* -- unused, from IRIX -- */
> +#define ATTR_SECURE 0x0008 /* use attrs in security namespace */
> +#define ATTR_CREATE 0x0010 /* pure create: fail if attr already exists */
> +#define ATTR_REPLACE 0x0020 /* pure set: fail if attr does not exist */
> +
> +#define ATTR_INCOMPLETE 0x4000 /* [kernel] return INCOMPLETE attr keys */
> +
> +#define XFS_ATTR_FLAGS \
> + { ATTR_DONTFOLLOW, "DONTFOLLOW" }, \
> + { ATTR_ROOT, "ROOT" }, \
> + { ATTR_TRUST, "TRUST" }, \
> + { ATTR_SECURE, "SECURE" }, \
> + { ATTR_CREATE, "CREATE" }, \
> + { ATTR_REPLACE, "REPLACE" }, \
> + { ATTR_KERNOTIME, "KERNOTIME" }, \
> + { ATTR_KERNOVAL, "KERNOVAL" }, \
> + { ATTR_INCOMPLETE, "INCOMPLETE" }
> +
> +/*
> + * The maximum size (into the kernel or returned from the kernel) of an
> + * attribute value or the buffer used for an attr_list() call. Larger
> + * sizes will result in an ERANGE return code.
> + */
> +#define ATTR_MAX_VALUELEN (64*1024) /* max length of a value */
> +
> +/*
> + * Define how lists of attribute names are returned to the user from
> + * the attr_list() call. A large, 32bit aligned, buffer is passed in
> + * along with its size. We put an array of offsets at the top that each
> + * reference an attrlist_ent_t and pack the attrlist_ent_t's at the bottom.
> + */
> +typedef struct attrlist {
> + __s32 al_count; /* number of entries in attrlist */
> + __s32 al_more; /* T/F: more attrs (do call again) */
> + __s32 al_offset[1]; /* byte offsets of attrs [var-sized] */
> +} attrlist_t;
> +
> +/*
> + * Show the interesting info about one attribute. This is what the
> + * al_offset[i] entry points to.
> + */
> +typedef struct attrlist_ent { /* data from attr_list() */
> + __u32 a_valuelen; /* number bytes in value of attr */
> + char a_name[1]; /* attr name (NULL terminated) */
> +} attrlist_ent_t;
> +
> +/*
> + * Given a pointer to the (char*) buffer containing the attr_list() result,
> + * and an index, return a pointer to the indicated attribute in the buffer.
> + */
> +#define ATTR_ENTRY(buffer, index) \
> + ((attrlist_ent_t *) \
> + &((char *)buffer)[ ((attrlist_t *)(buffer))->al_offset[index] ])
> +
> +/*
> + * Kernel-internal version of the attrlist cursor.
> + */
> +typedef struct attrlist_cursor_kern {
> + __u32 hashval; /* hash value of next entry to add */
> + __u32 blkno; /* block containing entry (suggestion) */
> + __u32 offset; /* offset in list of equal-hashvals */
> + __u16 pad1; /* padding to match user-level */
> + __u8 pad2; /* padding to match user-level */
> + __u8 initted; /* T/F: cursor has been initialized */
> +} attrlist_cursor_kern_t;
> +
> +
> +/*========================================================================
> + * Structure used to pass context around among the routines.
> + *========================================================================*/
> +
> +
> +/* void; state communicated via *context */
> +typedef void (*put_listent_func_t)(struct xfs_attr_list_context *, int,
> + unsigned char *, int, int);
> +
> +typedef struct xfs_attr_list_context {
> + struct xfs_trans *tp;
> + struct xfs_inode *dp; /* inode */
> + struct attrlist_cursor_kern *cursor; /* position in list */
> + char *alist; /* output buffer */
> + int seen_enough; /* T/F: seen enough of list? */
> + ssize_t count; /* num used entries */
> + int dupcnt; /* count dup hashvals seen */
> + int bufsize; /* total buffer size */
> + int firstu; /* first used byte in buffer */
> + int flags; /* from VOP call */
> + int resynch; /* T/F: resynch with cursor */
> + put_listent_func_t put_listent; /* list output fmt function */
> + int index; /* index into output buffer */
> +} xfs_attr_list_context_t;
> +
> +
> +/*========================================================================
> + * Function prototypes for the kernel.
> + *========================================================================*/
> +
> +/*
> + * Overall external interface routines.
> + */
> +int xfs_attr_inactive(struct xfs_inode *dp);
> +int xfs_attr_list_int_ilocked(struct xfs_attr_list_context *);
> +int xfs_attr_list_int(struct xfs_attr_list_context *);
> +int xfs_inode_hasattr(struct xfs_inode *ip);
> +int xfs_attr_get_ilocked(struct xfs_inode *ip, struct xfs_da_args *args);
> +int xfs_attr_get(struct xfs_inode *ip, const unsigned char *name,
> + unsigned char *value, int *valuelenp, int flags);
> +int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name,
> + unsigned char *value, int valuelen, int flags);
> +int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags);
> +int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
> + int flags, struct attrlist_cursor_kern *cursor);
> +
> +
> +#endif /* __XFS_ATTR_H__ */
> --
> 2.7.4
>
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