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Restructure mount option handling

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Restructure the handling of mount options to be consistent with
upstream OpenZFS.  This required making the following changes.

- The zfs_mntopts_t was renamed vfs_t and adjusted to provide
  the minimal needed functionality.  This includes a pointer
  back to the associated zfsvfs_t.  Plus it made it possible
  to revert zfs_register_callbacks() and zfsvfs_create() back
  to their original prototypes.

- A zfs_mnt_t structure was added for the sole purpose of
  providing a structure to pass the osname and raw mount
  pointer to zfs_domount() without having to copy them.

- Mount option parsing was moved down from the zpl_* wrapper
  functions in to the zfs_* functions.  This allowed for the
  code to be simplied and it's where similar functionality
  appears on other platforms.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf
2017-03-08 19:56:09 -05:00
parent f298b24ddf
commit 1c2555ef92
5 changed files with 296 additions and 313 deletions
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include/sys/zfs_vfsops.h
+34 -26
View File
@@ -41,33 +41,43 @@ extern "C" {
typedef struct zfsvfs zfsvfs_t;
struct znode;
typedef struct zfs_mntopts {
char *z_osname; /* Objset name */
char *z_mntpoint; /* Primary mount point */
uint64_t z_xattr;
boolean_t z_readonly;
boolean_t z_do_readonly;
boolean_t z_setuid;
boolean_t z_do_setuid;
boolean_t z_exec;
boolean_t z_do_exec;
boolean_t z_devices;
boolean_t z_do_devices;
boolean_t z_do_xattr;
boolean_t z_atime;
boolean_t z_do_atime;
boolean_t z_relatime;
boolean_t z_do_relatime;
boolean_t z_nbmand;
boolean_t z_do_nbmand;
} zfs_mntopts_t;
/*
* This structure emulates the vfs_t from other platforms. It's purpose
* is to faciliate the handling of mount options and minimize structural
* differences between the platforms.
*/
typedef struct vfs {
struct zfsvfs *vfs_data;
char *vfs_mntpoint; /* Primary mount point */
uint64_t vfs_xattr;
boolean_t vfs_readonly;
boolean_t vfs_do_readonly;
boolean_t vfs_setuid;
boolean_t vfs_do_setuid;
boolean_t vfs_exec;
boolean_t vfs_do_exec;
boolean_t vfs_devices;
boolean_t vfs_do_devices;
boolean_t vfs_do_xattr;
boolean_t vfs_atime;
boolean_t vfs_do_atime;
boolean_t vfs_relatime;
boolean_t vfs_do_relatime;
boolean_t vfs_nbmand;
boolean_t vfs_do_nbmand;
} vfs_t;
typedef struct zfs_mnt {
const char *mnt_osname; /* Objset name */
char *mnt_data; /* Raw mount options */
} zfs_mnt_t;
struct zfsvfs {
vfs_t *z_vfs; /* generic fs struct */
struct super_block *z_sb; /* generic super_block */
struct backing_dev_info z_bdi; /* generic backing dev info */
struct zfsvfs *z_parent; /* parent fs */
objset_t *z_os; /* objset reference */
zfs_mntopts_t *z_mntopts; /* passed mount options */
uint64_t z_flags; /* super_block flags */
uint64_t z_root; /* id of root znode */
uint64_t z_unlinkedobj; /* id of unlinked zapobj */
@@ -193,17 +203,15 @@ extern boolean_t zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup,
extern boolean_t zfs_fuid_overobjquota(zfsvfs_t *zfsvfs, boolean_t isgroup,
uint64_t fuid);
extern int zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers);
extern int zfsvfs_create(const char *name, zfs_mntopts_t *zmo, zfsvfs_t **zfvp);
extern int zfsvfs_create(const char *name, zfsvfs_t **zfvp);
extern void zfsvfs_free(zfsvfs_t *zfsvfs);
extern int zfs_check_global_label(const char *dsname, const char *hexsl);
extern boolean_t zfs_is_readonly(zfsvfs_t *zfsvfs);
extern zfs_mntopts_t *zfs_mntopts_alloc(void);
extern void zfs_mntopts_free(zfs_mntopts_t *zmo);
extern int zfs_domount(struct super_block *sb, zfs_mntopts_t *zmo, int silent);
extern int zfs_domount(struct super_block *sb, zfs_mnt_t *zm, int silent);
extern void zfs_preumount(struct super_block *sb);
extern int zfs_umount(struct super_block *sb);
extern int zfs_remount(struct super_block *sb, int *flags, zfs_mntopts_t *zmo);
extern int zfs_remount(struct super_block *sb, int *flags, zfs_mnt_t *zm);
extern int zfs_statvfs(struct dentry *dentry, struct kstatfs *statp);
extern int zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp);
extern int zfs_prune(struct super_block *sb, unsigned long nr_to_scan,