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RHEL 7.5 compat: FMODE_KABI_ITERATE

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As of RHEL 7.5 the mainline fops.iterate() method was added to
the file_operations structure and is correctly detected by the
configure script.

Normally this is what we want, but in order to maintain KABI
compatibility the RHEL change additionally does the following:

* Requires that callers intending to use this extended interface
  set the FMODE_KABI_ITERATE flag on the file structure when
  opening the directory.
* Adds the fops.iterate() method to the end of the structure,
  without removing fops.readdir().

This change updates the configure check to ignore the RHEL 7.5+
variant of fops.iterate() when detected.  Instead fallback to
the fops.readdir() interface which will be available.

Finally, add the 'zpl_' prefix to the directory context wrappers
to avoid colliding with the kernel provided symbols when both
the fops.iterate() and fops.readdir() are provided by the kernel.

Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #7460
Closes #7463
This commit is contained in:
Brian Behlendorf
2018-05-02 15:01:24 -07:00
committed by Tony Hutter
parent 245be00597
commit 0ee129199f
6 changed files with 61 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/zfs_vnops.h
+1 -1
View File
@@ -54,7 +54,7 @@ extern int zfs_mkdir(struct inode *dip, char *dirname, vattr_t *vap,
struct inode **ipp, cred_t *cr, int flags, vsecattr_t *vsecp);
extern int zfs_rmdir(struct inode *dip, char *name, struct inode *cwd,
cred_t *cr, int flags);
extern int zfs_readdir(struct inode *ip, struct dir_context *ctx, cred_t *cr);
extern int zfs_readdir(struct inode *ip, zpl_dir_context_t *ctx, cred_t *cr);
extern int zfs_fsync(struct inode *ip, int syncflag, cred_t *cr);
extern int zfs_getattr(struct inode *ip, vattr_t *vap, int flag, cred_t *cr);
extern int zfs_getattr_fast(struct inode *ip, struct kstat *sp);
include/sys/zpl.h
+17 -10
View File
@@ -125,56 +125,63 @@ extern const struct inode_operations zpl_ops_shares;
#if defined(HAVE_VFS_ITERATE) || defined(HAVE_VFS_ITERATE_SHARED)
#define DIR_CONTEXT_INIT(_dirent, _actor, _pos) { \
#define ZPL_DIR_CONTEXT_INIT(_dirent, _actor, _pos) { \
.actor = _actor, \
.pos = _pos, \
}
typedef struct dir_context zpl_dir_context_t;
#define zpl_dir_emit dir_emit
#define zpl_dir_emit_dot dir_emit_dot
#define zpl_dir_emit_dotdot dir_emit_dotdot
#define zpl_dir_emit_dots dir_emit_dots
#else
typedef struct dir_context {
typedef struct zpl_dir_context {
void *dirent;
const filldir_t actor;
loff_t pos;
} dir_context_t;
} zpl_dir_context_t;
#define DIR_CONTEXT_INIT(_dirent, _actor, _pos) { \
#define ZPL_DIR_CONTEXT_INIT(_dirent, _actor, _pos) { \
.dirent = _dirent, \
.actor = _actor, \
.pos = _pos, \
}
static inline bool
dir_emit(struct dir_context *ctx, const char *name, int namelen,
zpl_dir_emit(zpl_dir_context_t *ctx, const char *name, int namelen,
uint64_t ino, unsigned type)
{
return (!ctx->actor(ctx->dirent, name, namelen, ctx->pos, ino, type));
}
static inline bool
dir_emit_dot(struct file *file, struct dir_context *ctx)
zpl_dir_emit_dot(struct file *file, zpl_dir_context_t *ctx)
{
return (ctx->actor(ctx->dirent, ".", 1, ctx->pos,
file_inode(file)->i_ino, DT_DIR) == 0);
}
static inline bool
dir_emit_dotdot(struct file *file, struct dir_context *ctx)
zpl_dir_emit_dotdot(struct file *file, zpl_dir_context_t *ctx)
{
return (ctx->actor(ctx->dirent, "..", 2, ctx->pos,
parent_ino(file_dentry(file)), DT_DIR) == 0);
}
static inline bool
dir_emit_dots(struct file *file, struct dir_context *ctx)
zpl_dir_emit_dots(struct file *file, zpl_dir_context_t *ctx)
{
if (ctx->pos == 0) {
if (!dir_emit_dot(file, ctx))
if (!zpl_dir_emit_dot(file, ctx))
return (false);
ctx->pos = 1;
}
if (ctx->pos == 1) {
if (!dir_emit_dotdot(file, ctx))
if (!zpl_dir_emit_dotdot(file, ctx))
return (false);
ctx->pos = 2;
}