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xfs: switch to use the new mount-api

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Define the struct fs_parameter_spec table that's used by the new
mount-api for options parsing.

Create the various fs context operations methods and define the
fs_context_operations struct.

Create the fs context initialization method and update the struct
file_system_type to utilize it. The initialization function is
responsible for working storage initialization, allocation and
initialization of file system private information storage and for
setting the operations in the fs context.

Also set struct file_system_type .parameters to the newly defined
struct fs_parameter_spec options parsing table for use by the fs
context methods and remove unused code.

[darrick: add a comment pointing out the one place where mp->m_super is
null]

Signed-off-by: Ian Kent <raven@themaw.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Ian Kent 2019-11-04 13:58:46 -08:00 committed by Darrick J. Wong
parent 7c89fcb278
commit 73e5fff98b
1 changed files with 174 additions and 235 deletions
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409
fs/xfs/xfs_super.c
View File

@ -37,7 +37,8 @@
#include "xfs_reflink.h" #include "xfs_reflink.h"
#include <linux/magic.h> #include <linux/magic.h>
#include <linux/parser.h> #include <linux/fs_context.h>
#include <linux/fs_parser.h>
static const struct super_operations xfs_super_operations; static const struct super_operations xfs_super_operations;
@ -58,55 +59,57 @@ enum {
Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota, Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce, Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
Opt_discard, Opt_nodiscard, Opt_dax, Opt_err, Opt_discard, Opt_nodiscard, Opt_dax,
}; };
static const match_table_t tokens = { static const struct fs_parameter_spec xfs_param_specs[] = {
{Opt_logbufs, "logbufs=%u"}, /* number of XFS log buffers */ fsparam_u32("logbufs", Opt_logbufs),
{Opt_logbsize, "logbsize=%s"}, /* size of XFS log buffers */ fsparam_string("logbsize", Opt_logbsize),
{Opt_logdev, "logdev=%s"}, /* log device */ fsparam_string("logdev", Opt_logdev),
{Opt_rtdev, "rtdev=%s"}, /* realtime I/O device */ fsparam_string("rtdev", Opt_rtdev),
{Opt_wsync, "wsync"}, /* safe-mode nfs compatible mount */ fsparam_flag("wsync", Opt_wsync),
{Opt_noalign, "noalign"}, /* turn off stripe alignment */ fsparam_flag("noalign", Opt_noalign),
{Opt_swalloc, "swalloc"}, /* turn on stripe width allocation */ fsparam_flag("swalloc", Opt_swalloc),
{Opt_sunit, "sunit=%u"}, /* data volume stripe unit */ fsparam_u32("sunit", Opt_sunit),
{Opt_swidth, "swidth=%u"}, /* data volume stripe width */ fsparam_u32("swidth", Opt_swidth),
{Opt_nouuid, "nouuid"}, /* ignore filesystem UUID */ fsparam_flag("nouuid", Opt_nouuid),
{Opt_grpid, "grpid"}, /* group-ID from parent directory */ fsparam_flag("grpid", Opt_grpid),
{Opt_nogrpid, "nogrpid"}, /* group-ID from current process */ fsparam_flag("nogrpid", Opt_nogrpid),
{Opt_bsdgroups, "bsdgroups"}, /* group-ID from parent directory */ fsparam_flag("bsdgroups", Opt_bsdgroups),
{Opt_sysvgroups,"sysvgroups"}, /* group-ID from current process */ fsparam_flag("sysvgroups", Opt_sysvgroups),
{Opt_allocsize, "allocsize=%s"},/* preferred allocation size */ fsparam_string("allocsize", Opt_allocsize),
{Opt_norecovery,"norecovery"}, /* don't run XFS recovery */ fsparam_flag("norecovery", Opt_norecovery),
{Opt_inode64, "inode64"}, /* inodes can be allocated anywhere */ fsparam_flag("inode64", Opt_inode64),
{Opt_inode32, "inode32"}, /* inode allocation limited to fsparam_flag("inode32", Opt_inode32),
* XFS_MAXINUMBER_32 */ fsparam_flag("ikeep", Opt_ikeep),
{Opt_ikeep, "ikeep"}, /* do not free empty inode clusters */ fsparam_flag("noikeep", Opt_noikeep),
{Opt_noikeep, "noikeep"}, /* free empty inode clusters */ fsparam_flag("largeio", Opt_largeio),
{Opt_largeio, "largeio"}, /* report large I/O sizes in stat() */ fsparam_flag("nolargeio", Opt_nolargeio),
{Opt_nolargeio, "nolargeio"}, /* do not report large I/O sizes fsparam_flag("attr2", Opt_attr2),
* in stat(). */ fsparam_flag("noattr2", Opt_noattr2),
{Opt_attr2, "attr2"}, /* do use attr2 attribute format */ fsparam_flag("filestreams", Opt_filestreams),
{Opt_noattr2, "noattr2"}, /* do not use attr2 attribute format */ fsparam_flag("quota", Opt_quota),
{Opt_filestreams,"filestreams"},/* use filestreams allocator */ fsparam_flag("noquota", Opt_noquota),
{Opt_quota, "quota"}, /* disk quotas (user) */ fsparam_flag("usrquota", Opt_usrquota),
{Opt_noquota, "noquota"}, /* no quotas */ fsparam_flag("grpquota", Opt_grpquota),
{Opt_usrquota, "usrquota"}, /* user quota enabled */ fsparam_flag("prjquota", Opt_prjquota),
{Opt_grpquota, "grpquota"}, /* group quota enabled */ fsparam_flag("uquota", Opt_uquota),
{Opt_prjquota, "prjquota"}, /* project quota enabled */ fsparam_flag("gquota", Opt_gquota),
{Opt_uquota, "uquota"}, /* user quota (IRIX variant) */ fsparam_flag("pquota", Opt_pquota),
{Opt_gquota, "gquota"}, /* group quota (IRIX variant) */ fsparam_flag("uqnoenforce", Opt_uqnoenforce),
{Opt_pquota, "pquota"}, /* project quota (IRIX variant) */ fsparam_flag("gqnoenforce", Opt_gqnoenforce),
{Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */ fsparam_flag("pqnoenforce", Opt_pqnoenforce),
{Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */ fsparam_flag("qnoenforce", Opt_qnoenforce),
{Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */ fsparam_flag("discard", Opt_discard),
{Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */ fsparam_flag("nodiscard", Opt_nodiscard),
{Opt_discard, "discard"}, /* Discard unused blocks */ fsparam_flag("dax", Opt_dax),
{Opt_nodiscard, "nodiscard"}, /* Do not discard unused blocks */ {}
{Opt_dax, "dax"}, /* Enable direct access to bdev pages */
{Opt_err, NULL},
}; };
static const struct fs_parameter_description xfs_fs_parameters = {
.name = "xfs",
.specs = xfs_param_specs,
};
static int static int
suffix_kstrtoint( suffix_kstrtoint(
@ -143,55 +146,47 @@ suffix_kstrtoint(
return ret; return ret;
} }
static int /*
match_kstrtoint( * Set mount state from a mount option.
const substring_t *s, *
unsigned int base, * NOTE: mp->m_super is NULL here!
int *res) */
{
const char *value;
int ret;
value = match_strdup(s);
if (!value)
return -ENOMEM;
ret = suffix_kstrtoint(value, base, res);
kfree(value);
return ret;
}
static int static int
xfs_fc_parse_param( xfs_fc_parse_param(
int token, struct fs_context *fc,
char *p, struct fs_parameter *param)
substring_t *args,
struct xfs_mount *mp)
{ {
struct xfs_mount *mp = fc->s_fs_info;
struct fs_parse_result result;
int size = 0; int size = 0;
int opt;
switch (token) { opt = fs_parse(fc, &xfs_fs_parameters, param, &result);
if (opt < 0)
return opt;
switch (opt) {
case Opt_logbufs: case Opt_logbufs:
if (match_int(args, &mp->m_logbufs)) mp->m_logbufs = result.uint_32;
return -EINVAL;
return 0; return 0;
case Opt_logbsize: case Opt_logbsize:
if (match_kstrtoint(args, 10, &mp->m_logbsize)) if (suffix_kstrtoint(param->string, 10, &mp->m_logbsize))
return -EINVAL; return -EINVAL;
return 0; return 0;
case Opt_logdev: case Opt_logdev:
kfree(mp->m_logname); kfree(mp->m_logname);
mp->m_logname = match_strdup(args); mp->m_logname = kstrdup(param->string, GFP_KERNEL);
if (!mp->m_logname) if (!mp->m_logname)
return -ENOMEM; return -ENOMEM;
return 0; return 0;
case Opt_rtdev: case Opt_rtdev:
kfree(mp->m_rtname); kfree(mp->m_rtname);
mp->m_rtname = match_strdup(args); mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
if (!mp->m_rtname) if (!mp->m_rtname)
return -ENOMEM; return -ENOMEM;
return 0; return 0;
case Opt_allocsize: case Opt_allocsize:
if (match_kstrtoint(args, 10, &size)) if (suffix_kstrtoint(param->string, 10, &size))
return -EINVAL; return -EINVAL;
mp->m_allocsize_log = ffs(size) - 1; mp->m_allocsize_log = ffs(size) - 1;
mp->m_flags |= XFS_MOUNT_ALLOCSIZE; mp->m_flags |= XFS_MOUNT_ALLOCSIZE;
@ -217,12 +212,10 @@ xfs_fc_parse_param(
mp->m_flags |= XFS_MOUNT_SWALLOC; mp->m_flags |= XFS_MOUNT_SWALLOC;
return 0; return 0;
case Opt_sunit: case Opt_sunit:
if (match_int(args, &mp->m_dalign)) mp->m_dalign = result.uint_32;
return -EINVAL;
return 0; return 0;
case Opt_swidth: case Opt_swidth:
if (match_int(args, &mp->m_swidth)) mp->m_swidth = result.uint_32;
return -EINVAL;
return 0; return 0;
case Opt_inode32: case Opt_inode32:
mp->m_flags |= XFS_MOUNT_SMALL_INUMS; mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
@ -301,7 +294,7 @@ xfs_fc_parse_param(
return 0; return 0;
#endif #endif
default: default:
xfs_warn(mp, "unknown mount option [%s].", p); xfs_warn(mp, "unknown mount option [%s].", param->key);
return -EINVAL; return -EINVAL;
} }
@ -376,62 +369,6 @@ xfs_fc_validate_params(
return 0; return 0;
} }
/*
* This function fills in xfs_mount_t fields based on mount args.
* Note: the superblock has _not_ yet been read in.
*
* Note that this function leaks the various device name allocations on
* failure. The caller takes care of them.
*
* *sb is const because this is also used to test options on the remount
* path, and we don't want this to have any side effects at remount time.
* Today this function does not change *sb, but just to future-proof...
*/
static int
xfs_parseargs(
struct xfs_mount *mp,
char *options)
{
const struct super_block *sb = mp->m_super;
char *p;
substring_t args[MAX_OPT_ARGS];
/*
* Copy binary VFS mount flags we are interested in.
*/
if (sb_rdonly(sb))
mp->m_flags |= XFS_MOUNT_RDONLY;
if (sb->s_flags & SB_DIRSYNC)
mp->m_flags |= XFS_MOUNT_DIRSYNC;
if (sb->s_flags & SB_SYNCHRONOUS)
mp->m_flags |= XFS_MOUNT_WSYNC;
/*
* These can be overridden by the mount option parsing.
*/
mp->m_logbufs = -1;
mp->m_logbsize = -1;
mp->m_allocsize_log = 16; /* 64k */
if (!options)
return 0;
while ((p = strsep(&options, ",")) != NULL) {
int token;
int ret;
if (!*p)
continue;
token = match_token(p, tokens, args);
ret = xfs_fc_parse_param(token, p, args, mp);
if (ret)
return ret;
}
return xfs_fc_validate_params(mp);
}
struct proc_xfs_info { struct proc_xfs_info {
uint64_t flag; uint64_t flag;
char *str; char *str;
@ -1207,25 +1144,6 @@ xfs_quiesce_attr(
xfs_log_quiesce(mp); xfs_log_quiesce(mp);
} }
STATIC int
xfs_test_remount_options(
struct super_block *sb,
char *options)
{
int error = 0;
struct xfs_mount *tmp_mp;
tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
if (!tmp_mp)
return -ENOMEM;
tmp_mp->m_super = sb;
error = xfs_parseargs(tmp_mp, options);
xfs_mount_free(tmp_mp);
return error;
}
static int static int
xfs_remount_rw( xfs_remount_rw(
struct xfs_mount *mp) struct xfs_mount *mp)
@ -1329,76 +1247,57 @@ xfs_remount_ro(
return 0; return 0;
} }
STATIC int /*
xfs_fs_remount( * Logically we would return an error here to prevent users from believing
struct super_block *sb, * they might have changed mount options using remount which can't be changed.
int *flags, *
char *options) * But unfortunately mount(8) adds all options from mtab and fstab to the mount
* arguments in some cases so we can't blindly reject options, but have to
* check for each specified option if it actually differs from the currently
* set option and only reject it if that's the case.
*
* Until that is implemented we return success for every remount request, and
* silently ignore all options that we can't actually change.
*/
static int
xfs_fc_reconfigure(
struct fs_context *fc)
{ {
struct xfs_mount *mp = XFS_M(sb); struct xfs_mount *mp = XFS_M(fc->root->d_sb);
struct xfs_mount *new_mp = fc->s_fs_info;
xfs_sb_t *sbp = &mp->m_sb; xfs_sb_t *sbp = &mp->m_sb;
substring_t args[MAX_OPT_ARGS]; int flags = fc->sb_flags;
char *p;
int error; int error;
/* First, check for complete junk; i.e. invalid options */ error = xfs_fc_validate_params(new_mp);
error = xfs_test_remount_options(sb, options);
if (error) if (error)
return error; return error;
sync_filesystem(sb); sync_filesystem(mp->m_super);
while ((p = strsep(&options, ",")) != NULL) {
int token;
if (!*p) /* inode32 -> inode64 */
continue; if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
!(new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
}
token = match_token(p, tokens, args); /* inode64 -> inode32 */
switch (token) { if (!(mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
case Opt_inode64: (new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS; mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount); mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
break;
case Opt_inode32:
mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
break;
default:
/*
* Logically we would return an error here to prevent
* users from believing they might have changed
* mount options using remount which can't be changed.
*
* But unfortunately mount(8) adds all options from
* mtab and fstab to the mount arguments in some cases
* so we can't blindly reject options, but have to
* check for each specified option if it actually
* differs from the currently set option and only
* reject it if that's the case.
*
* Until that is implemented we return success for
* every remount request, and silently ignore all
* options that we can't actually change.
*/
#if 0
xfs_info(mp,
"mount option \"%s\" not supported for remount", p);
return -EINVAL;
#else
break;
#endif
}
} }
/* ro -> rw */ /* ro -> rw */
if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & SB_RDONLY)) { if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(flags & SB_RDONLY)) {
error = xfs_remount_rw(mp); error = xfs_remount_rw(mp);
if (error) if (error)
return error; return error;
} }
/* rw -> ro */ /* rw -> ro */
if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & SB_RDONLY)) { if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (flags & SB_RDONLY)) {
error = xfs_remount_ro(mp); error = xfs_remount_ro(mp);
if (error) if (error)
return error; return error;
@ -1588,28 +1487,18 @@ xfs_mount_alloc(void)
return mp; return mp;
} }
static int
STATIC int xfs_fc_fill_super(
xfs_fs_fill_super(
struct super_block *sb, struct super_block *sb,
void *data, struct fs_context *fc)
int silent)
{ {
struct xfs_mount *mp = sb->s_fs_info;
struct inode *root; struct inode *root;
struct xfs_mount *mp = NULL;
int flags = 0, error = -ENOMEM; int flags = 0, error = -ENOMEM;
/*
* allocate mp and do all low-level struct initializations before we
* attach it to the super
*/
mp = xfs_mount_alloc();
if (!mp)
goto out;
mp->m_super = sb; mp->m_super = sb;
sb->s_fs_info = mp;
error = xfs_parseargs(mp, (char *)data); error = xfs_fc_validate_params(mp);
if (error) if (error)
goto out_free_names; goto out_free_names;
@ -1633,7 +1522,7 @@ xfs_fs_fill_super(
msleep(xfs_globals.mount_delay * 1000); msleep(xfs_globals.mount_delay * 1000);
} }
if (silent) if (fc->sb_flags & SB_SILENT)
flags |= XFS_MFSI_QUIET; flags |= XFS_MFSI_QUIET;
error = xfs_open_devices(mp); error = xfs_open_devices(mp);
@ -1778,7 +1667,6 @@ xfs_fs_fill_super(
out_free_names: out_free_names:
sb->s_fs_info = NULL; sb->s_fs_info = NULL;
xfs_mount_free(mp); xfs_mount_free(mp);
out:
return error; return error;
out_unmount: out_unmount:
@ -1787,6 +1675,13 @@ xfs_fs_fill_super(
goto out_free_sb; goto out_free_sb;
} }
static int
xfs_fc_get_tree(
struct fs_context *fc)
{
return get_tree_bdev(fc, xfs_fc_fill_super);
}
STATIC void STATIC void
xfs_fs_put_super( xfs_fs_put_super(
struct super_block *sb) struct super_block *sb)
@ -1811,16 +1706,6 @@ xfs_fs_put_super(
xfs_mount_free(mp); xfs_mount_free(mp);
} }
STATIC struct dentry *
xfs_fs_mount(
struct file_system_type *fs_type,
int flags,
const char *dev_name,
void *data)
{
return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
}
static long static long
xfs_fs_nr_cached_objects( xfs_fs_nr_cached_objects(
struct super_block *sb, struct super_block *sb,
@ -1850,16 +1735,70 @@ static const struct super_operations xfs_super_operations = {
.freeze_fs = xfs_fs_freeze, .freeze_fs = xfs_fs_freeze,
.unfreeze_fs = xfs_fs_unfreeze, .unfreeze_fs = xfs_fs_unfreeze,
.statfs = xfs_fs_statfs, .statfs = xfs_fs_statfs,
.remount_fs = xfs_fs_remount,
.show_options = xfs_fs_show_options, .show_options = xfs_fs_show_options,
.nr_cached_objects = xfs_fs_nr_cached_objects, .nr_cached_objects = xfs_fs_nr_cached_objects,
.free_cached_objects = xfs_fs_free_cached_objects, .free_cached_objects = xfs_fs_free_cached_objects,
}; };
static void xfs_fc_free(
struct fs_context *fc)
{
struct xfs_mount *mp = fc->s_fs_info;
/*
* mp is stored in the fs_context when it is initialized.
* mp is transferred to the superblock on a successful mount,
* but if an error occurs before the transfer we have to free
* it here.
*/
if (mp)
xfs_mount_free(mp);
}
static const struct fs_context_operations xfs_context_ops = {
.parse_param = xfs_fc_parse_param,
.get_tree = xfs_fc_get_tree,
.reconfigure = xfs_fc_reconfigure,
.free = xfs_fc_free,
};
static int xfs_init_fs_context(
struct fs_context *fc)
{
struct xfs_mount *mp;
mp = xfs_mount_alloc();
if (!mp)
return -ENOMEM;
/*
* These can be overridden by the mount option parsing.
*/
mp->m_logbufs = -1;
mp->m_logbsize = -1;
mp->m_allocsize_log = 16; /* 64k */
/*
* Copy binary VFS mount flags we are interested in.
*/
if (fc->sb_flags & SB_RDONLY)
mp->m_flags |= XFS_MOUNT_RDONLY;
if (fc->sb_flags & SB_DIRSYNC)
mp->m_flags |= XFS_MOUNT_DIRSYNC;
if (fc->sb_flags & SB_SYNCHRONOUS)
mp->m_flags |= XFS_MOUNT_WSYNC;
fc->s_fs_info = mp;
fc->ops = &xfs_context_ops;
return 0;
}
static struct file_system_type xfs_fs_type = { static struct file_system_type xfs_fs_type = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.name = "xfs", .name = "xfs",
.mount = xfs_fs_mount, .init_fs_context = xfs_init_fs_context,
.parameters = &xfs_fs_parameters,
.kill_sb = kill_block_super, .kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV, .fs_flags = FS_REQUIRES_DEV,
}; };