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1168f09541
Use kcalloc() for allocation/flush of 128 pointers table to
reduce stack usage.
Function now returns -ENOMEM or 0 on success.
stackusage
Before:
./fs/jffs2/xattr.c:775 jffs2_build_xattr_subsystem 1208
dynamic,bounded
After:
./fs/jffs2/xattr.c:775 jffs2_build_xattr_subsystem 192
dynamic,bounded
Also update definition when CONFIG_JFFS2_FS_XATTR is not enabled
Tested with an MTD mount point and some user set/getfattr.
Many current target on OpenWRT also suffer from a compilation warning
(that become an error with CONFIG_WERROR) with the following output:
fs/jffs2/xattr.c: In function 'jffs2_build_xattr_subsystem':
fs/jffs2/xattr.c:887:1: error: the frame size of 1088 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
887 | }
| ^
Using dynamic allocation fix this compilation warning.
Fixes: c9f700f840 ("[JFFS2][XATTR] using 'delete marker' for xdatum/xref deletion")
Reported-by: Tim Gardner <tim.gardner@canonical.com>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Ron Economos <re@w6rz.net>
Reported-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Cc: stable@vger.kernel.org
Message-Id: <20230506045612.16616-1-ansuelsmth@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright © 2006 NEC Corporation
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*
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* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#ifndef _JFFS2_FS_XATTR_H_
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#define _JFFS2_FS_XATTR_H_
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#include <linux/xattr.h>
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#include <linux/list.h>
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#define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */
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#define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */
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#define JFFS2_XFLAGS_DEAD (0x40) /* This datum is already dead */
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#define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */
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struct jffs2_xattr_datum
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{
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void *always_null;
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struct jffs2_raw_node_ref *node;
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uint8_t class;
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uint8_t flags;
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uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */
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struct list_head xindex; /* chained from c->xattrindex[n] */
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atomic_t refcnt; /* # of xattr_ref refers this */
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uint32_t xid;
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uint32_t version;
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uint32_t data_crc;
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uint32_t hashkey;
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char *xname; /* XATTR name without prefix */
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uint32_t name_len; /* length of xname */
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char *xvalue; /* XATTR value */
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uint32_t value_len; /* length of xvalue */
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};
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struct jffs2_inode_cache;
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struct jffs2_xattr_ref
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{
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void *always_null;
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struct jffs2_raw_node_ref *node;
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uint8_t class;
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uint8_t flags; /* Currently unused */
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u16 unused;
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uint32_t xseqno;
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union {
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struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */
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uint32_t ino; /* only used in scanning/building */
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};
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union {
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struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */
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uint32_t xid; /* only used in sccanning/building */
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};
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struct jffs2_xattr_ref *next; /* chained from ic->xref_list */
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};
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#define XREF_DELETE_MARKER (0x00000001)
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static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
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{
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return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
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}
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#ifdef CONFIG_JFFS2_FS_XATTR
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extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
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extern int jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
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extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
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extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
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uint32_t xid, uint32_t version);
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extern void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
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extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
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extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
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extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
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struct jffs2_raw_node_ref *raw);
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extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
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struct jffs2_raw_node_ref *raw);
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extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
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extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
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extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
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extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
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char *buffer, size_t size);
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extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
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const char *buffer, size_t size, int flags);
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extern const struct xattr_handler *jffs2_xattr_handlers[];
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extern const struct xattr_handler jffs2_user_xattr_handler;
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extern const struct xattr_handler jffs2_trusted_xattr_handler;
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extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
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#else
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#define jffs2_init_xattr_subsystem(c)
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#define jffs2_build_xattr_subsystem(c) (0)
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#define jffs2_clear_xattr_subsystem(c)
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#define jffs2_xattr_do_crccheck_inode(c, ic)
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#define jffs2_xattr_delete_inode(c, ic)
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#define jffs2_xattr_free_inode(c, ic)
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#define jffs2_verify_xattr(c) (1)
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#define jffs2_xattr_handlers NULL
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#define jffs2_listxattr NULL
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#endif /* CONFIG_JFFS2_FS_XATTR */
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#ifdef CONFIG_JFFS2_FS_SECURITY
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extern int jffs2_init_security(struct inode *inode, struct inode *dir,
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const struct qstr *qstr);
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extern const struct xattr_handler jffs2_security_xattr_handler;
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#else
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#define jffs2_init_security(inode,dir,qstr) (0)
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#endif /* CONFIG_JFFS2_FS_SECURITY */
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#endif /* _JFFS2_FS_XATTR_H_ */
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