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b894f6b04c
There are new interfaces available but the old one has been retained for us to use. In case of older kernels, we will need to fall back to the previous name of these functions. Signed-off-by: Auke Kok <auke.kok@versity.com>
117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
#ifndef _SCOUTFS_KERNELCOMPAT_H_
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#define _SCOUTFS_KERNELCOMPAT_H_
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#include <linux/kernel.h>
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#include <linux/fs.h>
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/*
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* v4.15-rc3-4-gae5e165d855d
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*
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* new API for handling inode->i_version. This forces us to
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* include this API where we need. We include it here for
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* convenience instead of where it's needed.
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*/
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#ifdef KC_NEED_LINUX_IVERSION_H
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#include <linux/iversion.h>
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#else
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/*
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* Kernels before above version will need to fall back to
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* manipulating inode->i_version as previous with degraded
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* methods.
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*/
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#define inode_set_iversion_queried(inode, val) \
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do { \
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(inode)->i_version = val; \
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} while (0)
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#define inode_peek_iversion(inode) \
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({ \
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(inode)->i_version; \
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})
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#endif
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#ifndef KC_ITERATE_DIR_CONTEXT
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typedef filldir_t kc_readdir_ctx_t;
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#define KC_DECLARE_READDIR(name, file, dirent, ctx) name(file, dirent, ctx)
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#define KC_FOP_READDIR readdir
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#define kc_readdir_pos(filp, ctx) (filp)->f_pos
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#define kc_dir_emit_dots(file, dirent, ctx) dir_emit_dots(file, dirent, ctx)
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#define kc_dir_emit(ctx, dirent, name, name_len, pos, ino, dt) \
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(ctx(dirent, name, name_len, pos, ino, dt) == 0)
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#else
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typedef struct dir_context * kc_readdir_ctx_t;
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#define KC_DECLARE_READDIR(name, file, dirent, ctx) name(file, ctx)
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#define KC_FOP_READDIR iterate
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#define kc_readdir_pos(filp, ctx) (ctx)->pos
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#define kc_dir_emit_dots(file, dirent, ctx) dir_emit_dots(file, ctx)
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#define kc_dir_emit(ctx, dirent, name, name_len, pos, ino, dt) \
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dir_emit(ctx, name, name_len, ino, dt)
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#endif
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#ifndef KC_DIR_EMIT_DOTS
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/*
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* Kernels before ->iterate and don't have dir_emit_dots so we give them
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* one that works with the ->readdir() filldir() method.
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*/
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static inline int dir_emit_dots(struct file *file, void *dirent,
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filldir_t filldir)
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{
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if (file->f_pos == 0) {
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if (filldir(dirent, ".", 1, 1,
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file->f_path.dentry->d_inode->i_ino, DT_DIR))
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return 0;
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file->f_pos = 1;
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}
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if (file->f_pos == 1) {
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if (filldir(dirent, "..", 2, 1,
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parent_ino(file->f_path.dentry), DT_DIR))
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return 0;
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file->f_pos = 2;
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}
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return 1;
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}
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#endif
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#ifdef KC_POSIX_ACL_VALID_USER_NS
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#define kc_posix_acl_valid(user_ns, acl) posix_acl_valid(user_ns, acl)
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#else
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#define kc_posix_acl_valid(user_ns, acl) posix_acl_valid(acl)
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#endif
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/*
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* v3.6-rc1-24-gdbf2576e37da
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*
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* All workqueues are now non-reentrant, and the bit flag is removed
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* shortly after its uses were removed.
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*/
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#ifndef WQ_NON_REENTRANT
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#define WQ_NON_REENTRANT 0
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#endif
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/*
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* v3.18-rc2-19-gb5ae6b15bd73
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*
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* Folds d_materialise_unique into d_splice_alias. Note reversal
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* of arguments (Also note Documentation/filesystems/porting.rst)
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*/
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#ifndef KC_D_MATERIALISE_UNIQUE
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#define d_materialise_unique(dentry, inode) d_splice_alias(inode, dentry)
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#endif
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/*
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* v4.8-rc1-29-g31051c85b5e2
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*
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* fall back to inode_change_ok() if setattr_prepare() isn't available
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*/
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#ifndef KC_SETATTR_PREPARE
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#define setattr_prepare(dentry, attr) inode_change_ok(d_inode(dentry), attr)
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#endif
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#ifndef KC___POSIX_ACL_CREATE
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#define __posix_acl_create posix_acl_create
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#define __posix_acl_chmod posix_acl_chmod
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#endif
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#endif
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