diff options
Diffstat (limited to 'fs/xfs/xfs_super.c')
| -rw-r--r-- | fs/xfs/xfs_super.c | 2774 |
1 files changed, 2774 insertions, 0 deletions
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c new file mode 100644 index 000000000..4b2eeb778 --- /dev/null +++ b/fs/xfs/xfs_super.c @@ -0,0 +1,2774 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2000-2006 Silicon Graphics, Inc. + * All Rights Reserved. + */ + +#include "xfs_platform.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_sb.h" +#include "xfs_mount.h" +#include "xfs_inode.h" +#include "xfs_btree.h" +#include "xfs_bmap.h" +#include "xfs_alloc.h" +#include "xfs_fsops.h" +#include "xfs_trans.h" +#include "xfs_buf_item.h" +#include "xfs_log.h" +#include "xfs_log_priv.h" +#include "xfs_dir2.h" +#include "xfs_extfree_item.h" +#include "xfs_mru_cache.h" +#include "xfs_inode_item.h" +#include "xfs_icache.h" +#include "xfs_trace.h" +#include "xfs_icreate_item.h" +#include "xfs_filestream.h" +#include "xfs_quota.h" +#include "xfs_sysfs.h" +#include "xfs_ondisk.h" +#include "xfs_rmap_item.h" +#include "xfs_refcount_item.h" +#include "xfs_bmap_item.h" +#include "xfs_reflink.h" +#include "xfs_pwork.h" +#include "xfs_ag.h" +#include "xfs_defer.h" +#include "xfs_attr_item.h" +#include "xfs_xattr.h" +#include "xfs_error.h" +#include "xfs_errortag.h" +#include "xfs_iunlink_item.h" +#include "xfs_dahash_test.h" +#include "xfs_rtbitmap.h" +#include "xfs_exchmaps_item.h" +#include "xfs_parent.h" +#include "xfs_rtalloc.h" +#include "xfs_zone_alloc.h" +#include "xfs_healthmon.h" +#include "scrub/stats.h" +#include "scrub/rcbag_btree.h" + +#include <linux/magic.h> +#include <linux/fs_context.h> +#include <linux/fs_parser.h> +#include <linux/fserror.h> + +static const struct super_operations xfs_super_operations; + +static struct dentry *xfs_debugfs; /* top-level xfs debugfs dir */ +static struct kset *xfs_kset; /* top-level xfs sysfs dir */ +#ifdef DEBUG +static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */ +#endif + +enum xfs_dax_mode { + XFS_DAX_INODE = 0, + XFS_DAX_ALWAYS = 1, + XFS_DAX_NEVER = 2, +}; + +/* Were quota mount options provided? Must use the upper 16 bits of qflags. */ +#define XFS_QFLAGS_MNTOPTS (1U << 31) + +static void +xfs_mount_set_dax_mode( + struct xfs_mount *mp, + enum xfs_dax_mode mode) +{ + switch (mode) { + case XFS_DAX_INODE: + mp->m_features &= ~(XFS_FEAT_DAX_ALWAYS | XFS_FEAT_DAX_NEVER); + break; + case XFS_DAX_ALWAYS: + mp->m_features |= XFS_FEAT_DAX_ALWAYS; + mp->m_features &= ~XFS_FEAT_DAX_NEVER; + break; + case XFS_DAX_NEVER: + mp->m_features |= XFS_FEAT_DAX_NEVER; + mp->m_features &= ~XFS_FEAT_DAX_ALWAYS; + break; + } +} + +static const struct constant_table dax_param_enums[] = { + {"inode", XFS_DAX_INODE }, + {"always", XFS_DAX_ALWAYS }, + {"never", XFS_DAX_NEVER }, + {} +}; + +/* + * Table driven mount option parser. + */ +enum { + Op_deprecated, Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, + Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid, + Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups, + Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, + Opt_largeio, Opt_nolargeio, + Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, + Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota, + Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce, + Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum, Opt_max_open_zones, + Opt_lifetime, Opt_nolifetime, Opt_max_atomic_write, Opt_errortag, +}; + +#define fsparam_dead(NAME) \ + __fsparam(NULL, (NAME), Op_deprecated, fs_param_deprecated, NULL) + +static const struct fs_parameter_spec xfs_fs_parameters[] = { + /* + * These mount options were supposed to be deprecated in September 2025 + * but the deprecation warning was buggy, so not all users were + * notified. The deprecation is now obnoxiously loud and postponed to + * September 2030. + */ + fsparam_dead("attr2"), + fsparam_dead("noattr2"), + fsparam_dead("ikeep"), + fsparam_dead("noikeep"), + + fsparam_u32("logbufs", Opt_logbufs), + fsparam_string("logbsize", Opt_logbsize), + fsparam_string("logdev", Opt_logdev), + fsparam_string("rtdev", Opt_rtdev), + fsparam_flag("wsync", Opt_wsync), + fsparam_flag("noalign", Opt_noalign), + fsparam_flag("swalloc", Opt_swalloc), + fsparam_u32("sunit", Opt_sunit), + fsparam_u32("swidth", Opt_swidth), + fsparam_flag("nouuid", Opt_nouuid), + fsparam_flag("grpid", Opt_grpid), + fsparam_flag("nogrpid", Opt_nogrpid), + fsparam_flag("bsdgroups", Opt_bsdgroups), + fsparam_flag("sysvgroups", Opt_sysvgroups), + fsparam_string("allocsize", Opt_allocsize), + fsparam_flag("norecovery", Opt_norecovery), + fsparam_flag("inode64", Opt_inode64), + fsparam_flag("inode32", Opt_inode32), + fsparam_flag("largeio", Opt_largeio), + fsparam_flag("nolargeio", Opt_nolargeio), + fsparam_flag("filestreams", Opt_filestreams), + fsparam_flag("quota", Opt_quota), + fsparam_flag("noquota", Opt_noquota), + fsparam_flag("usrquota", Opt_usrquota), + fsparam_flag("grpquota", Opt_grpquota), + fsparam_flag("prjquota", Opt_prjquota), + fsparam_flag("uquota", Opt_uquota), + fsparam_flag("gquota", Opt_gquota), + fsparam_flag("pquota", Opt_pquota), + fsparam_flag("uqnoenforce", Opt_uqnoenforce), + fsparam_flag("gqnoenforce", Opt_gqnoenforce), + fsparam_flag("pqnoenforce", Opt_pqnoenforce), + fsparam_flag("qnoenforce", Opt_qnoenforce), + fsparam_flag("discard", Opt_discard), + fsparam_flag("nodiscard", Opt_nodiscard), + fsparam_flag("dax", Opt_dax), + fsparam_enum("dax", Opt_dax_enum, dax_param_enums), + fsparam_u32("max_open_zones", Opt_max_open_zones), + fsparam_flag("lifetime", Opt_lifetime), + fsparam_flag("nolifetime", Opt_nolifetime), + fsparam_string("max_atomic_write", Opt_max_atomic_write), + fsparam_string("errortag", Opt_errortag), + {} +}; + +struct proc_xfs_info { + uint64_t flag; + char *str; +}; + +static int +xfs_fs_show_options( + struct seq_file *m, + struct dentry *root) +{ + static struct proc_xfs_info xfs_info_set[] = { + /* the few simple ones we can get from the mount struct */ + { XFS_FEAT_WSYNC, ",wsync" }, + { XFS_FEAT_NOALIGN, ",noalign" }, + { XFS_FEAT_SWALLOC, ",swalloc" }, + { XFS_FEAT_NOUUID, ",nouuid" }, + { XFS_FEAT_NORECOVERY, ",norecovery" }, + { XFS_FEAT_FILESTREAMS, ",filestreams" }, + { XFS_FEAT_GRPID, ",grpid" }, + { XFS_FEAT_DISCARD, ",discard" }, + { XFS_FEAT_LARGE_IOSIZE, ",largeio" }, + { XFS_FEAT_DAX_ALWAYS, ",dax=always" }, + { XFS_FEAT_DAX_NEVER, ",dax=never" }, + { XFS_FEAT_NOLIFETIME, ",nolifetime" }, + { 0, NULL } + }; + struct xfs_mount *mp = XFS_M(root->d_sb); + struct proc_xfs_info *xfs_infop; + + for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) { + if (mp->m_features & xfs_infop->flag) + seq_puts(m, xfs_infop->str); + } + + seq_printf(m, ",inode%d", xfs_has_small_inums(mp) ? 32 : 64); + + if (xfs_has_allocsize(mp)) + seq_printf(m, ",allocsize=%dk", + (1 << mp->m_allocsize_log) >> 10); + + if (mp->m_logbufs > 0) + seq_printf(m, ",logbufs=%d", mp->m_logbufs); + if (mp->m_logbsize > 0) + seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10); + + if (mp->m_logname) + seq_show_option(m, "logdev", mp->m_logname); + if (mp->m_rtname) + seq_show_option(m, "rtdev", mp->m_rtname); + + if (mp->m_dalign > 0) + seq_printf(m, ",sunit=%d", + (int)XFS_FSB_TO_BB(mp, mp->m_dalign)); + if (mp->m_swidth > 0) + seq_printf(m, ",swidth=%d", + (int)XFS_FSB_TO_BB(mp, mp->m_swidth)); + + if (mp->m_qflags & XFS_UQUOTA_ENFD) + seq_puts(m, ",usrquota"); + else if (mp->m_qflags & XFS_UQUOTA_ACCT) + seq_puts(m, ",uqnoenforce"); + + if (mp->m_qflags & XFS_PQUOTA_ENFD) + seq_puts(m, ",prjquota"); + else if (mp->m_qflags & XFS_PQUOTA_ACCT) + seq_puts(m, ",pqnoenforce"); + + if (mp->m_qflags & XFS_GQUOTA_ENFD) + seq_puts(m, ",grpquota"); + else if (mp->m_qflags & XFS_GQUOTA_ACCT) + seq_puts(m, ",gqnoenforce"); + + if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT)) + seq_puts(m, ",noquota"); + + if (mp->m_max_open_zones) + seq_printf(m, ",max_open_zones=%u", mp->m_max_open_zones); + if (mp->m_awu_max_bytes) + seq_printf(m, ",max_atomic_write=%lluk", + mp->m_awu_max_bytes >> 10); + + return 0; +} + +static bool +xfs_set_inode_alloc_perag( + struct xfs_perag *pag, + xfs_ino_t ino, + xfs_agnumber_t max_metadata) +{ + if (!xfs_is_inode32(pag_mount(pag))) { + set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate); + clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate); + return false; + } + + if (ino > XFS_MAXINUMBER_32) { + clear_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate); + clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate); + return false; + } + + set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate); + if (pag_agno(pag) < max_metadata) + set_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate); + else + clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate); + return true; +} + +/* + * Set parameters for inode allocation heuristics, taking into account + * filesystem size and inode32/inode64 mount options; i.e. specifically + * whether or not XFS_FEAT_SMALL_INUMS is set. + * + * Inode allocation patterns are altered only if inode32 is requested + * (XFS_FEAT_SMALL_INUMS), and the filesystem is sufficiently large. + * If altered, XFS_OPSTATE_INODE32 is set as well. + * + * An agcount independent of that in the mount structure is provided + * because in the growfs case, mp->m_sb.sb_agcount is not yet updated + * to the potentially higher ag count. + * + * Returns the maximum AG index which may contain inodes. + */ +xfs_agnumber_t +xfs_set_inode_alloc( + struct xfs_mount *mp, + xfs_agnumber_t agcount) +{ + xfs_agnumber_t index; + xfs_agnumber_t maxagi = 0; + xfs_sb_t *sbp = &mp->m_sb; + xfs_agnumber_t max_metadata; + xfs_agino_t agino; + xfs_ino_t ino; + + /* + * Calculate how much should be reserved for inodes to meet + * the max inode percentage. Used only for inode32. + */ + if (M_IGEO(mp)->maxicount) { + uint64_t icount; + + icount = sbp->sb_dblocks * sbp->sb_imax_pct; + do_div(icount, 100); + icount += sbp->sb_agblocks - 1; + do_div(icount, sbp->sb_agblocks); + max_metadata = icount; + } else { + max_metadata = agcount; + } + + /* Get the last possible inode in the filesystem */ + agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1); + ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); + + /* + * If user asked for no more than 32-bit inodes, and the fs is + * sufficiently large, set XFS_OPSTATE_INODE32 if we must alter + * the allocator to accommodate the request. + */ + if (xfs_has_small_inums(mp) && ino > XFS_MAXINUMBER_32) + xfs_set_inode32(mp); + else + xfs_clear_inode32(mp); + + for (index = 0; index < agcount; index++) { + struct xfs_perag *pag; + + ino = XFS_AGINO_TO_INO(mp, index, agino); + + pag = xfs_perag_get(mp, index); + if (xfs_set_inode_alloc_perag(pag, ino, max_metadata)) + maxagi++; + xfs_perag_put(pag); + } + + return xfs_is_inode32(mp) ? maxagi : agcount; +} + +static int +xfs_setup_dax_always( + struct xfs_mount *mp) +{ + if (!mp->m_ddev_targp->bt_daxdev && + (!mp->m_rtdev_targp || !mp->m_rtdev_targp->bt_daxdev)) { + xfs_alert(mp, + "DAX unsupported by block device. Turning off DAX."); + goto disable_dax; + } + + if (mp->m_super->s_blocksize != PAGE_SIZE) { + xfs_alert(mp, + "DAX not supported for blocksize. Turning off DAX."); + goto disable_dax; + } + + if (xfs_has_reflink(mp) && + bdev_is_partition(mp->m_ddev_targp->bt_bdev)) { + xfs_alert(mp, + "DAX and reflink cannot work with multi-partitions!"); + return -EINVAL; + } + + return 0; + +disable_dax: + xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER); + return 0; +} + +STATIC int +xfs_blkdev_get( + xfs_mount_t *mp, + const char *name, + struct file **bdev_filep) +{ + int error = 0; + blk_mode_t mode; + + mode = sb_open_mode(mp->m_super->s_flags); + *bdev_filep = fs_bdev_file_open_by_path(name, mode, + mp->m_super, mp->m_super); + if (IS_ERR(*bdev_filep)) { + error = PTR_ERR(*bdev_filep); + *bdev_filep = NULL; + xfs_warn(mp, "Invalid device [%s], error=%d", name, error); + } + + return error; +} + +STATIC void +xfs_shutdown_devices( + struct xfs_mount *mp) +{ + /* + * Udev is triggered whenever anyone closes a block device or unmounts + * a file systemm on a block device. + * The default udev rules invoke blkid to read the fs super and create + * symlinks to the bdev under /dev/disk. For this, it uses buffered + * reads through the page cache. + * + * xfs_db also uses buffered reads to examine metadata. There is no + * coordination between xfs_db and udev, which means that they can run + * concurrently. Note there is no coordination between the kernel and + * blkid either. + * + * On a system with 64k pages, the page cache can cache the superblock + * and the root inode (and hence the root directory) with the same 64k + * page. If udev spawns blkid after the mkfs and the system is busy + * enough that it is still running when xfs_db starts up, they'll both + * read from the same page in the pagecache. + * + * The unmount writes updated inode metadata to disk directly. The XFS + * buffer cache does not use the bdev pagecache, so it needs to + * invalidate that pagecache on unmount. If the above scenario occurs, + * the pagecache no longer reflects what's on disk, xfs_db reads the + * stale metadata, and fails to find /a. Most of the time this succeeds + * because closing a bdev invalidates the page cache, but when processes + * race, everyone loses. + */ + if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { + blkdev_issue_flush(mp->m_logdev_targp->bt_bdev); + invalidate_bdev(mp->m_logdev_targp->bt_bdev); + } + if (mp->m_rtdev_targp) { + blkdev_issue_flush(mp->m_rtdev_targp->bt_bdev); + invalidate_bdev(mp->m_rtdev_targp->bt_bdev); + } + blkdev_issue_flush(mp->m_ddev_targp->bt_bdev); + invalidate_bdev(mp->m_ddev_targp->bt_bdev); +} + +/* + * The file system configurations are: + * (1) device (partition) with data and internal log + * (2) logical volume with data and log subvolumes. + * (3) logical volume with data, log, and realtime subvolumes. + * + * We only have to handle opening the log and realtime volumes here if + * they are present. The data subvolume has already been opened by + * get_sb_bdev() and is stored in sb->s_bdev. + */ +STATIC int +xfs_open_devices( + struct xfs_mount *mp) +{ + struct super_block *sb = mp->m_super; + struct block_device *ddev = sb->s_bdev; + struct file *logdev_file = NULL, *rtdev_file = NULL; + int error; + + /* + * Open real time and log devices - order is important. + */ + if (mp->m_logname) { + error = xfs_blkdev_get(mp, mp->m_logname, &logdev_file); + if (error) + return error; + } + + if (mp->m_rtname) { + error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev_file); + if (error) + goto out_close_logdev; + + if (file_bdev(rtdev_file) == ddev || + (logdev_file && + file_bdev(rtdev_file) == file_bdev(logdev_file))) { + xfs_warn(mp, + "Cannot mount filesystem with identical rtdev and ddev/logdev."); + error = -EINVAL; + goto out_close_rtdev; + } + } + + /* + * Setup xfs_mount buffer target pointers + */ + mp->m_ddev_targp = xfs_alloc_buftarg(mp, sb->s_bdev_file); + if (IS_ERR(mp->m_ddev_targp)) { + error = PTR_ERR(mp->m_ddev_targp); + mp->m_ddev_targp = NULL; + goto out_close_rtdev; + } + + if (rtdev_file) { + mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev_file); + if (IS_ERR(mp->m_rtdev_targp)) { + error = PTR_ERR(mp->m_rtdev_targp); + mp->m_rtdev_targp = NULL; + goto out_free_ddev_targ; + } + } + + if (logdev_file && file_bdev(logdev_file) != ddev) { + mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev_file); + if (IS_ERR(mp->m_logdev_targp)) { + error = PTR_ERR(mp->m_logdev_targp); + mp->m_logdev_targp = NULL; + goto out_free_rtdev_targ; + } + } else { + mp->m_logdev_targp = mp->m_ddev_targp; + /* Handle won't be used, drop it */ + if (logdev_file) + fs_bdev_file_release(logdev_file, mp->m_super); + } + + return 0; + + out_free_rtdev_targ: + if (mp->m_rtdev_targp) + xfs_free_buftarg(mp->m_rtdev_targp); + mp->m_rtdev_targp = NULL; + rtdev_file = NULL; /* released by xfs_free_buftarg() */ + out_free_ddev_targ: + xfs_free_buftarg(mp->m_ddev_targp); + mp->m_ddev_targp = NULL; + out_close_rtdev: + if (rtdev_file) + fs_bdev_file_release(rtdev_file, mp->m_super); + out_close_logdev: + if (logdev_file) + fs_bdev_file_release(logdev_file, mp->m_super); + return error; +} + +/* + * When using a RT device some or all data I/O is using the RT device, but + * the BDI is inherited from the main data device. When the underlying block + * device for the RT device has larger I/O sizes, the BDI settings might be + * incorrect, which is especially bad if the main device is a SSD and the + * RT device is a HDD, as the io_opt fixup in blk_apply_bdi_limits is missing + * for this case. + * + * Update the BDI values to the max of the data and RT device to cover our + * bases. + */ +static void +xfs_update_bdi_rahead( + struct xfs_mount *mp) +{ + struct backing_dev_info *rt_bdi = + mp->m_rtdev_targp->bt_bdev->bd_disk->bdi; + struct backing_dev_info *sb_bdi = mp->m_super->s_bdi; + + mp->m_old_io_pages = sb_bdi->io_pages; + mp->m_old_ra_pages = sb_bdi->ra_pages; + + sb_bdi->io_pages = mp->m_initial_io_pages = + max(sb_bdi->io_pages, rt_bdi->io_pages); + sb_bdi->ra_pages = mp->m_initial_ra_pages = + max(sb_bdi->ra_pages, rt_bdi->ra_pages); +} + +static void +xfs_restore_bdi_rahead( + struct xfs_mount *mp) +{ + struct backing_dev_info *sb_bdi = mp->m_super->s_bdi; + + if (sb_bdi->io_pages == mp->m_initial_io_pages) + sb_bdi->io_pages = mp->m_old_io_pages; + else + xfs_info(mp, "io_pages changed from %lu to %lu, not restoring.", + mp->m_initial_io_pages, sb_bdi->io_pages); + if (sb_bdi->ra_pages == mp->m_initial_ra_pages) + sb_bdi->ra_pages = mp->m_old_ra_pages; + else + xfs_info(mp, "ra_pages changed from %lu to %lu, not restoring.", + mp->m_initial_ra_pages, sb_bdi->ra_pages); +} + +/* + * Setup xfs_mount buffer target pointers based on superblock + */ +STATIC int +xfs_setup_devices( + struct xfs_mount *mp) +{ + int error; + + error = xfs_configure_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize, + mp->m_sb.sb_dblocks); + if (error) + return error; + + if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { + unsigned int log_sector_size = BBSIZE; + + if (xfs_has_sector(mp)) + log_sector_size = mp->m_sb.sb_logsectsize; + error = xfs_configure_buftarg(mp->m_logdev_targp, + log_sector_size, mp->m_sb.sb_logblocks); + if (error) + return error; + } + + if (mp->m_sb.sb_rtstart) { + if (mp->m_rtdev_targp) { + xfs_warn(mp, + "can't use internal and external rtdev at the same time"); + return -EINVAL; + } + mp->m_rtdev_targp = mp->m_ddev_targp; + } else if (mp->m_rtname) { + error = xfs_configure_buftarg(mp->m_rtdev_targp, + mp->m_sb.sb_sectsize, mp->m_sb.sb_rblocks); + if (error) + return error; + xfs_update_bdi_rahead(mp); + } + + return 0; +} + +STATIC int +xfs_init_mount_workqueues( + struct xfs_mount *mp) +{ + mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s", + XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU), + 1, mp->m_super->s_id); + if (!mp->m_buf_workqueue) + goto out; + + mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s", + XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU), + 0, mp->m_super->s_id); + if (!mp->m_unwritten_workqueue) + goto out_destroy_buf; + + mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s", + XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU), + 0, mp->m_super->s_id); + if (!mp->m_reclaim_workqueue) + goto out_destroy_unwritten; + + mp->m_blockgc_wq = alloc_workqueue("xfs-blockgc/%s", + XFS_WQFLAGS(WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM), + 0, mp->m_super->s_id); + if (!mp->m_blockgc_wq) + goto out_destroy_reclaim; + + mp->m_inodegc_wq = alloc_workqueue("xfs-inodegc/%s", + XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU), + 1, mp->m_super->s_id); + if (!mp->m_inodegc_wq) + goto out_destroy_blockgc; + + mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", + XFS_WQFLAGS(WQ_FREEZABLE | WQ_PERCPU), 0, + mp->m_super->s_id); + if (!mp->m_sync_workqueue) + goto out_destroy_inodegc; + + return 0; + +out_destroy_inodegc: + destroy_workqueue(mp->m_inodegc_wq); +out_destroy_blockgc: + destroy_workqueue(mp->m_blockgc_wq); +out_destroy_reclaim: + destroy_workqueue(mp->m_reclaim_workqueue); +out_destroy_unwritten: + destroy_workqueue(mp->m_unwritten_workqueue); +out_destroy_buf: + destroy_workqueue(mp->m_buf_workqueue); +out: + return -ENOMEM; +} + +STATIC void +xfs_destroy_mount_workqueues( + struct xfs_mount *mp) +{ + destroy_workqueue(mp->m_sync_workqueue); + destroy_workqueue(mp->m_blockgc_wq); + destroy_workqueue(mp->m_inodegc_wq); + destroy_workqueue(mp->m_reclaim_workqueue); + destroy_workqueue(mp->m_unwritten_workqueue); + destroy_workqueue(mp->m_buf_workqueue); +} + +static void +xfs_flush_inodes_worker( + struct work_struct *work) +{ + struct xfs_mount *mp = container_of(work, struct xfs_mount, + m_flush_inodes_work); + struct super_block *sb = mp->m_super; + + if (down_read_trylock(&sb->s_umount)) { + sync_inodes_sb(sb); + up_read(&sb->s_umount); + } +} + +/* + * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK + * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting + * for IO to complete so that we effectively throttle multiple callers to the + * rate at which IO is completing. + */ +void +xfs_flush_inodes( + struct xfs_mount *mp) +{ + /* + * If flush_work() returns true then that means we waited for a flush + * which was already in progress. Don't bother running another scan. + */ + if (flush_work(&mp->m_flush_inodes_work)) + return; + + queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work); + flush_work(&mp->m_flush_inodes_work); +} + +/* Catch misguided souls that try to use this interface on XFS */ +STATIC struct inode * +xfs_fs_alloc_inode( + struct super_block *sb) +{ + BUG(); + return NULL; +} + +/* + * Now that the generic code is guaranteed not to be accessing + * the linux inode, we can inactivate and reclaim the inode. + */ +STATIC void +xfs_fs_destroy_inode( + struct inode *inode) +{ + struct xfs_inode *ip = XFS_I(inode); + + trace_xfs_destroy_inode(ip); + + ASSERT(!rwsem_is_locked(&inode->i_rwsem)); + XFS_STATS_INC(ip->i_mount, xs_inode_destroy); + XFS_STATS_INC(ip->i_mount, xs_inode_destroy2); + xfs_inode_mark_reclaimable(ip); +} + +/* + * Slab object creation initialisation for the XFS inode. + * This covers only the idempotent fields in the XFS inode; + * all other fields need to be initialised on allocation + * from the slab. This avoids the need to repeatedly initialise + * fields in the xfs inode that left in the initialise state + * when freeing the inode. + */ +STATIC void +xfs_fs_inode_init_once( + void *inode) +{ + struct xfs_inode *ip = inode; + + memset(ip, 0, sizeof(struct xfs_inode)); + + /* vfs inode */ + inode_init_once(VFS_I(ip)); + + /* xfs inode */ + atomic_set(&ip->i_pincount, 0); + spin_lock_init(&ip->i_flags_lock); + init_rwsem(&ip->i_lock); +} + +/* + * We do an unlocked check for XFS_IDONTCACHE here because we are already + * serialised against cache hits here via the inode->i_lock and igrab() in + * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be + * racing with us, and it avoids needing to grab a spinlock here for every inode + * we drop the final reference on. + */ +STATIC int +xfs_fs_drop_inode( + struct inode *inode) +{ + struct xfs_inode *ip = XFS_I(inode); + + /* + * If this unlinked inode is in the middle of recovery, don't + * drop the inode just yet; log recovery will take care of + * that. See the comment for this inode flag. + */ + if (ip->i_flags & XFS_IRECOVERY) { + ASSERT(xlog_recovery_needed(ip->i_mount->m_log)); + return 0; + } + + return inode_generic_drop(inode); +} + +STATIC void +xfs_fs_evict_inode( + struct inode *inode) +{ + if (IS_DAX(inode)) + dax_break_layout_final(inode); + + truncate_inode_pages_final(&inode->i_data); + clear_inode(inode); + + if (IS_ENABLED(CONFIG_XFS_RT) && + S_ISREG(inode->i_mode) && inode->i_private) { + xfs_open_zone_put(inode->i_private); + inode->i_private = NULL; + } +} + +static void +xfs_mount_free( + struct xfs_mount *mp) +{ + if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) + xfs_free_buftarg(mp->m_logdev_targp); + if (mp->m_rtdev_targp && mp->m_rtdev_targp != mp->m_ddev_targp) + xfs_free_buftarg(mp->m_rtdev_targp); + if (mp->m_ddev_targp) + xfs_free_buftarg(mp->m_ddev_targp); + + debugfs_remove(mp->m_debugfs); + kfree(mp->m_rtname); + kfree(mp->m_logname); +#ifdef DEBUG + kfree(mp->m_errortag); +#endif + kfree(mp); +} + +STATIC int +xfs_fs_sync_fs( + struct super_block *sb, + int wait) +{ + struct xfs_mount *mp = XFS_M(sb); + int error; + + trace_xfs_fs_sync_fs(mp, __return_address); + + /* + * Doing anything during the async pass would be counterproductive. + */ + if (!wait) + return 0; + + error = xfs_log_force(mp, XFS_LOG_SYNC); + if (error) + return error; + + /* + * If we are called with page faults frozen out, it means we are about + * to freeze the transaction subsystem. Take the opportunity to shut + * down inodegc because once SB_FREEZE_FS is set it's too late to + * prevent inactivation races with freeze. The fs doesn't get called + * again by the freezing process until after SB_FREEZE_FS has been set, + * so it's now or never. Same logic applies to speculative allocation + * garbage collection. + * + * We don't care if this is a normal syncfs call that does this or + * freeze that does this - we can run this multiple times without issue + * and we won't race with a restart because a restart can only occur + * when the state is either SB_FREEZE_FS or SB_FREEZE_COMPLETE. + */ + if (sb->s_writers.frozen == SB_FREEZE_PAGEFAULT) { + xfs_inodegc_stop(mp); + xfs_blockgc_stop(mp); + xfs_zone_gc_stop(mp); + } + + return 0; +} + +static xfs_extlen_t +xfs_internal_log_size( + struct xfs_mount *mp) +{ + if (!mp->m_sb.sb_logstart) + return 0; + return mp->m_sb.sb_logblocks; +} + +static void +xfs_statfs_data( + struct xfs_mount *mp, + struct kstatfs *st) +{ + int64_t fdblocks = + xfs_sum_freecounter(mp, XC_FREE_BLOCKS); + + /* make sure st->f_bfree does not underflow */ + st->f_bfree = max(0LL, + fdblocks - xfs_freecounter_unavailable(mp, XC_FREE_BLOCKS)); + + /* + * sb_dblocks can change during growfs, but nothing cares about reporting + * the old or new value during growfs. + */ + st->f_blocks = mp->m_sb.sb_dblocks - xfs_internal_log_size(mp); +} + +/* + * When stat(v)fs is called on a file with the realtime bit set or a directory + * with the rtinherit bit, report freespace information for the RT device + * instead of the main data device. + */ +static void +xfs_statfs_rt( + struct xfs_mount *mp, + struct kstatfs *st) +{ + st->f_bfree = xfs_rtbxlen_to_blen(mp, + xfs_sum_freecounter(mp, XC_FREE_RTEXTENTS)); + st->f_blocks = mp->m_sb.sb_rblocks - xfs_rtbxlen_to_blen(mp, + mp->m_free[XC_FREE_RTEXTENTS].res_total); +} + +static void +xfs_statfs_inodes( + struct xfs_mount *mp, + struct kstatfs *st) +{ + uint64_t icount = percpu_counter_sum(&mp->m_icount); + uint64_t ifree = percpu_counter_sum(&mp->m_ifree); + uint64_t fakeinos = XFS_FSB_TO_INO(mp, st->f_bfree); + + st->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER); + if (M_IGEO(mp)->maxicount) + st->f_files = min_t(typeof(st->f_files), st->f_files, + M_IGEO(mp)->maxicount); + + /* If sb_icount overshot maxicount, report actual allocation */ + st->f_files = max_t(typeof(st->f_files), st->f_files, + mp->m_sb.sb_icount); + + /* Make sure st->f_ffree does not underflow */ + st->f_ffree = max_t(int64_t, 0, st->f_files - (icount - ifree)); +} + +STATIC int +xfs_fs_statfs( + struct dentry *dentry, + struct kstatfs *st) +{ + struct xfs_mount *mp = XFS_M(dentry->d_sb); + struct xfs_inode *ip = XFS_I(d_inode(dentry)); + + /* + * Expedite background inodegc but don't wait. We do not want to block + * here waiting hours for a billion extent file to be truncated. + */ + xfs_inodegc_push(mp); + + st->f_type = XFS_SUPER_MAGIC; + st->f_namelen = MAXNAMELEN - 1; + st->f_bsize = mp->m_sb.sb_blocksize; + st->f_fsid = u64_to_fsid(huge_encode_dev(mp->m_ddev_targp->bt_dev)); + + xfs_statfs_data(mp, st); + xfs_statfs_inodes(mp, st); + + if (XFS_IS_REALTIME_MOUNT(mp) && + (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) + xfs_statfs_rt(mp, st); + + if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) && + ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) == + (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD)) + xfs_qm_statvfs(ip, st); + + /* + * XFS does not distinguish between blocks available to privileged and + * unprivileged users. + */ + st->f_bavail = st->f_bfree; + return 0; +} + +STATIC void +xfs_save_resvblks( + struct xfs_mount *mp) +{ + enum xfs_free_counter i; + + for (i = 0; i < XC_FREE_NR; i++) { + mp->m_free[i].res_saved = mp->m_free[i].res_total; + xfs_reserve_blocks(mp, i, 0); + } +} + +STATIC void +xfs_restore_resvblks( + struct xfs_mount *mp) +{ + uint64_t resblks; + enum xfs_free_counter i; + + for (i = 0; i < XC_FREE_NR; i++) { + if (mp->m_free[i].res_saved) { + resblks = mp->m_free[i].res_saved; + mp->m_free[i].res_saved = 0; + } else + resblks = xfs_default_resblks(mp, i); + xfs_reserve_blocks(mp, i, resblks); + } +} + +/* + * Second stage of a freeze. The data is already frozen so we only + * need to take care of the metadata. Once that's done sync the superblock + * to the log to dirty it in case of a crash while frozen. This ensures that we + * will recover the unlinked inode lists on the next mount. + */ +STATIC int +xfs_fs_freeze( + struct super_block *sb) +{ + struct xfs_mount *mp = XFS_M(sb); + unsigned int flags; + int ret; + + /* + * The filesystem is now frozen far enough that memory reclaim + * cannot safely operate on the filesystem. Hence we need to + * set a GFP_NOFS context here to avoid recursion deadlocks. + */ + flags = memalloc_nofs_save(); + xfs_save_resvblks(mp); + ret = xfs_log_quiesce(mp); + memalloc_nofs_restore(flags); + + /* + * For read-write filesystems, we need to restart the inodegc on error + * because we stopped it at SB_FREEZE_PAGEFAULT level and a thaw is not + * going to be run to restart it now. We are at SB_FREEZE_FS level + * here, so we can restart safely without racing with a stop in + * xfs_fs_sync_fs(). + */ + if (ret && !xfs_is_readonly(mp)) { + xfs_blockgc_start(mp); + xfs_inodegc_start(mp); + xfs_zone_gc_start(mp); + } + + return ret; +} + +STATIC int +xfs_fs_unfreeze( + struct super_block *sb) +{ + struct xfs_mount *mp = XFS_M(sb); + + xfs_restore_resvblks(mp); + xfs_log_work_queue(mp); + + /* + * Don't reactivate the inodegc worker on a readonly filesystem because + * inodes are sent directly to reclaim. Don't reactivate the blockgc + * worker because there are no speculative preallocations on a readonly + * filesystem. + */ + if (!xfs_is_readonly(mp)) { + xfs_zone_gc_start(mp); + xfs_blockgc_start(mp); + xfs_inodegc_start(mp); + } + + return 0; +} + +/* + * This function fills in xfs_mount_t fields based on mount args. + * Note: the superblock _has_ now been read in. + */ +STATIC int +xfs_finish_flags( + struct xfs_mount *mp) +{ + /* Fail a mount where the logbuf is smaller than the log stripe */ + if (xfs_has_logv2(mp)) { + if (mp->m_logbsize <= 0 && + mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) { + mp->m_logbsize = mp->m_sb.sb_logsunit; + } else if (mp->m_logbsize > 0 && + mp->m_logbsize < mp->m_sb.sb_logsunit) { + xfs_warn(mp, + "logbuf size must be greater than or equal to log stripe size"); + return -EINVAL; + } + } else { + /* Fail a mount if the logbuf is larger than 32K */ + if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) { + xfs_warn(mp, + "logbuf size for version 1 logs must be 16K or 32K"); + return -EINVAL; + } + } + + /* + * prohibit r/w mounts of read-only filesystems + */ + if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !xfs_is_readonly(mp)) { + xfs_warn(mp, + "cannot mount a read-only filesystem as read-write"); + return -EROFS; + } + + if ((mp->m_qflags & XFS_GQUOTA_ACCT) && + (mp->m_qflags & XFS_PQUOTA_ACCT) && + !xfs_has_pquotino(mp)) { + xfs_warn(mp, + "Super block does not support project and group quota together"); + return -EINVAL; + } + + if (!xfs_has_zoned(mp)) { + if (mp->m_max_open_zones) { + xfs_warn(mp, +"max_open_zones mount option only supported on zoned file systems."); + return -EINVAL; + } + if (mp->m_features & XFS_FEAT_NOLIFETIME) { + xfs_warn(mp, +"nolifetime mount option only supported on zoned file systems."); + return -EINVAL; + } + } + + return 0; +} + +static int +xfs_init_percpu_counters( + struct xfs_mount *mp) +{ + int error; + int i; + + error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL); + if (error) + return -ENOMEM; + + error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL); + if (error) + goto free_icount; + + error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL); + if (error) + goto free_ifree; + + error = percpu_counter_init(&mp->m_delalloc_rtextents, 0, GFP_KERNEL); + if (error) + goto free_delalloc; + + for (i = 0; i < XC_FREE_NR; i++) { + error = percpu_counter_init(&mp->m_free[i].count, 0, + GFP_KERNEL); + if (error) + goto free_freecounters; + } + + return 0; + +free_freecounters: + while (--i >= 0) + percpu_counter_destroy(&mp->m_free[i].count); + percpu_counter_destroy(&mp->m_delalloc_rtextents); +free_delalloc: + percpu_counter_destroy(&mp->m_delalloc_blks); +free_ifree: + percpu_counter_destroy(&mp->m_ifree); +free_icount: + percpu_counter_destroy(&mp->m_icount); + return -ENOMEM; +} + +void +xfs_reinit_percpu_counters( + struct xfs_mount *mp) +{ + percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount); + percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree); + xfs_set_freecounter(mp, XC_FREE_BLOCKS, mp->m_sb.sb_fdblocks); + if (!xfs_has_zoned(mp)) + xfs_set_freecounter(mp, XC_FREE_RTEXTENTS, + mp->m_sb.sb_frextents); +} + +static void +xfs_destroy_percpu_counters( + struct xfs_mount *mp) +{ + enum xfs_free_counter i; + + for (i = 0; i < XC_FREE_NR; i++) + percpu_counter_destroy(&mp->m_free[i].count); + percpu_counter_destroy(&mp->m_icount); + percpu_counter_destroy(&mp->m_ifree); + ASSERT(xfs_is_shutdown(mp) || + percpu_counter_sum(&mp->m_delalloc_rtextents) == 0); + percpu_counter_destroy(&mp->m_delalloc_rtextents); + ASSERT(xfs_is_shutdown(mp) || + percpu_counter_sum(&mp->m_delalloc_blks) == 0); + percpu_counter_destroy(&mp->m_delalloc_blks); +} + +static int +xfs_inodegc_init_percpu( + struct xfs_mount *mp) +{ + struct xfs_inodegc *gc; + int cpu; + + mp->m_inodegc = alloc_percpu(struct xfs_inodegc); + if (!mp->m_inodegc) + return -ENOMEM; + + for_each_possible_cpu(cpu) { + gc = per_cpu_ptr(mp->m_inodegc, cpu); + gc->cpu = cpu; + gc->mp = mp; + init_llist_head(&gc->list); + gc->items = 0; + gc->error = 0; + INIT_DELAYED_WORK(&gc->work, xfs_inodegc_worker); + } + return 0; +} + +static void +xfs_inodegc_free_percpu( + struct xfs_mount *mp) +{ + if (!mp->m_inodegc) + return; + free_percpu(mp->m_inodegc); +} + +static void +xfs_fs_put_super( + struct super_block *sb) +{ + struct xfs_mount *mp = XFS_M(sb); + + xfs_notice(mp, "Unmounting Filesystem %pU", &mp->m_sb.sb_uuid); + xfs_filestream_unmount(mp); + xfs_unmountfs(mp); + + xfs_rtmount_freesb(mp); + xfs_freesb(mp); + xchk_mount_stats_free(mp); + free_percpu(mp->m_stats.xs_stats); + xfs_inodegc_free_percpu(mp); + xfs_destroy_percpu_counters(mp); + xfs_destroy_mount_workqueues(mp); + xfs_shutdown_devices(mp); +} + +static long +xfs_fs_nr_cached_objects( + struct super_block *sb, + struct shrink_control *sc) +{ + /* Paranoia: catch incorrect calls during mount setup or teardown */ + if (WARN_ON_ONCE(!sb->s_fs_info)) + return 0; + return xfs_reclaim_inodes_count(XFS_M(sb)); +} + +static long +xfs_fs_free_cached_objects( + struct super_block *sb, + struct shrink_control *sc) +{ + return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan); +} + +static void +xfs_fs_shutdown( + struct super_block *sb) +{ + xfs_force_shutdown(XFS_M(sb), SHUTDOWN_DEVICE_REMOVED); +} + +static int +xfs_fs_show_stats( + struct seq_file *m, + struct dentry *root) +{ + struct xfs_mount *mp = XFS_M(root->d_sb); + + if (xfs_has_zoned(mp) && IS_ENABLED(CONFIG_XFS_RT)) + xfs_zoned_show_stats(m, mp); + return 0; +} + +static void +xfs_fs_report_error( + const struct fserror_event *event) +{ + /* healthmon already knows about non-inode and metadata errors */ + if (event->inode && event->type != FSERR_METADATA) + xfs_healthmon_report_file_ioerror(XFS_I(event->inode), event); +} + +static const struct super_operations xfs_super_operations = { + .alloc_inode = xfs_fs_alloc_inode, + .destroy_inode = xfs_fs_destroy_inode, + .drop_inode = xfs_fs_drop_inode, + .evict_inode = xfs_fs_evict_inode, + .put_super = xfs_fs_put_super, + .sync_fs = xfs_fs_sync_fs, + .freeze_fs = xfs_fs_freeze, + .unfreeze_fs = xfs_fs_unfreeze, + .statfs = xfs_fs_statfs, + .show_options = xfs_fs_show_options, + .nr_cached_objects = xfs_fs_nr_cached_objects, + .free_cached_objects = xfs_fs_free_cached_objects, + .shutdown = xfs_fs_shutdown, + .show_stats = xfs_fs_show_stats, + .report_error = xfs_fs_report_error, +}; + +static int +suffix_kstrtoint( + const char *s, + unsigned int base, + int *res) +{ + int last, shift_left_factor = 0, _res; + char *value; + int ret = 0; + + value = kstrdup(s, GFP_KERNEL); + if (!value) + return -ENOMEM; + + last = strlen(value) - 1; + if (value[last] == 'K' || value[last] == 'k') { + shift_left_factor = 10; + value[last] = '\0'; + } + if (value[last] == 'M' || value[last] == 'm') { + shift_left_factor = 20; + value[last] = '\0'; + } + if (value[last] == 'G' || value[last] == 'g') { + shift_left_factor = 30; + value[last] = '\0'; + } + + if (kstrtoint(value, base, &_res)) + ret = -EINVAL; + kfree(value); + *res = _res << shift_left_factor; + return ret; +} + +static int +suffix_kstrtoull( + const char *s, + unsigned int base, + unsigned long long *res) +{ + int last, shift_left_factor = 0; + unsigned long long _res; + char *value; + int ret = 0; + + value = kstrdup(s, GFP_KERNEL); + if (!value) + return -ENOMEM; + + last = strlen(value) - 1; + if (value[last] == 'K' || value[last] == 'k') { + shift_left_factor = 10; + value[last] = '\0'; + } + if (value[last] == 'M' || value[last] == 'm') { + shift_left_factor = 20; + value[last] = '\0'; + } + if (value[last] == 'G' || value[last] == 'g') { + shift_left_factor = 30; + value[last] = '\0'; + } + + if (kstrtoull(value, base, &_res)) + ret = -EINVAL; + kfree(value); + *res = _res << shift_left_factor; + return ret; +} + +static inline void +xfs_fs_warn_deprecated( + struct fs_context *fc, + struct fs_parameter *param) +{ + /* + * Always warn about someone passing in a deprecated mount option. + * Previously we wouldn't print the warning if we were reconfiguring + * and current mount point already had the flag set, but that was not + * the right thing to do. + * + * Many distributions mount the root filesystem with no options in the + * initramfs and rely on mount -a to remount the root fs with the + * options in fstab. However, the old behavior meant that there would + * never be a warning about deprecated mount options for the root fs in + * /etc/fstab. On a single-fs system, that means no warning at all. + * + * Compounding this problem are distribution scripts that copy + * /proc/mounts to fstab, which means that we can't remove mount + * options unless we're 100% sure they have only ever been advertised + * in /proc/mounts in response to explicitly provided mount options. + */ + xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key); +} + +/* + * Set mount state from a mount option. + * + * NOTE: mp->m_super is NULL here! + */ +static int +xfs_fs_parse_param( + struct fs_context *fc, + struct fs_parameter *param) +{ + struct xfs_mount *parsing_mp = fc->s_fs_info; + struct fs_parse_result result; + int size = 0; + int opt; + + BUILD_BUG_ON(XFS_QFLAGS_MNTOPTS & XFS_MOUNT_QUOTA_ALL); + + opt = fs_parse(fc, xfs_fs_parameters, param, &result); + if (opt < 0) + return opt; + + switch (opt) { + case Op_deprecated: + xfs_fs_warn_deprecated(fc, param); + return 0; + case Opt_logbufs: + parsing_mp->m_logbufs = result.uint_32; + return 0; + case Opt_logbsize: + if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize)) + return -EINVAL; + return 0; + case Opt_logdev: + kfree(parsing_mp->m_logname); + parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL); + if (!parsing_mp->m_logname) + return -ENOMEM; + return 0; + case Opt_rtdev: + kfree(parsing_mp->m_rtname); + parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL); + if (!parsing_mp->m_rtname) + return -ENOMEM; + return 0; + case Opt_allocsize: + if (suffix_kstrtoint(param->string, 10, &size)) + return -EINVAL; + parsing_mp->m_allocsize_log = ffs(size) - 1; + parsing_mp->m_features |= XFS_FEAT_ALLOCSIZE; + return 0; + case Opt_grpid: + case Opt_bsdgroups: + parsing_mp->m_features |= XFS_FEAT_GRPID; + return 0; + case Opt_nogrpid: + case Opt_sysvgroups: + parsing_mp->m_features &= ~XFS_FEAT_GRPID; + return 0; + case Opt_wsync: + parsing_mp->m_features |= XFS_FEAT_WSYNC; + return 0; + case Opt_norecovery: + parsing_mp->m_features |= XFS_FEAT_NORECOVERY; + return 0; + case Opt_noalign: + parsing_mp->m_features |= XFS_FEAT_NOALIGN; + return 0; + case Opt_swalloc: + parsing_mp->m_features |= XFS_FEAT_SWALLOC; + return 0; + case Opt_sunit: + parsing_mp->m_dalign = result.uint_32; + return 0; + case Opt_swidth: + parsing_mp->m_swidth = result.uint_32; + return 0; + case Opt_inode32: + parsing_mp->m_features |= XFS_FEAT_SMALL_INUMS; + return 0; + case Opt_inode64: + parsing_mp->m_features &= ~XFS_FEAT_SMALL_INUMS; + return 0; + case Opt_nouuid: + parsing_mp->m_features |= XFS_FEAT_NOUUID; + return 0; + case Opt_largeio: + parsing_mp->m_features |= XFS_FEAT_LARGE_IOSIZE; + return 0; + case Opt_nolargeio: + parsing_mp->m_features &= ~XFS_FEAT_LARGE_IOSIZE; + return 0; + case Opt_filestreams: + parsing_mp->m_features |= XFS_FEAT_FILESTREAMS; + return 0; + case Opt_noquota: + parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT; + parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD; + parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS; + return 0; + case Opt_quota: + case Opt_uquota: + case Opt_usrquota: + parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ENFD); + parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS; + return 0; + case Opt_qnoenforce: + case Opt_uqnoenforce: + parsing_mp->m_qflags |= XFS_UQUOTA_ACCT; + parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD; + parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS; + return 0; + case Opt_pquota: + case Opt_prjquota: + parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ENFD); + parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS; + return 0; + case Opt_pqnoenforce: + parsing_mp->m_qflags |= XFS_PQUOTA_ACCT; + parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD; + parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS; + return 0; + case Opt_gquota: + case Opt_grpquota: + parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ENFD); + parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS; + return 0; + case Opt_gqnoenforce: + parsing_mp->m_qflags |= XFS_GQUOTA_ACCT; + parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD; + parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS; + return 0; + case Opt_discard: + parsing_mp->m_features |= XFS_FEAT_DISCARD; + return 0; + case Opt_nodiscard: + parsing_mp->m_features &= ~XFS_FEAT_DISCARD; + return 0; +#ifdef CONFIG_FS_DAX + case Opt_dax: + xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS); + return 0; + case Opt_dax_enum: + xfs_mount_set_dax_mode(parsing_mp, result.uint_32); + return 0; +#endif + case Opt_max_open_zones: + parsing_mp->m_max_open_zones = result.uint_32; + return 0; + case Opt_lifetime: + parsing_mp->m_features &= ~XFS_FEAT_NOLIFETIME; + return 0; + case Opt_nolifetime: + parsing_mp->m_features |= XFS_FEAT_NOLIFETIME; + return 0; + case Opt_max_atomic_write: + if (suffix_kstrtoull(param->string, 10, + &parsing_mp->m_awu_max_bytes)) { + xfs_warn(parsing_mp, + "max atomic write size must be positive integer"); + return -EINVAL; + } + return 0; + case Opt_errortag: + return xfs_errortag_add_name(parsing_mp, param->string); + default: + xfs_warn(parsing_mp, "unknown mount option [%s].", param->key); + return -EINVAL; + } + + return 0; +} + +static int +xfs_fs_validate_params( + struct xfs_mount *mp) +{ + /* No recovery flag requires a read-only mount */ + if (xfs_has_norecovery(mp) && !xfs_is_readonly(mp)) { + xfs_warn(mp, "no-recovery mounts must be read-only."); + return -EINVAL; + } + + if (xfs_has_noalign(mp) && (mp->m_dalign || mp->m_swidth)) { + xfs_warn(mp, + "sunit and swidth options incompatible with the noalign option"); + return -EINVAL; + } + + if (!IS_ENABLED(CONFIG_XFS_QUOTA) && + (mp->m_qflags & ~XFS_QFLAGS_MNTOPTS)) { + xfs_warn(mp, "quota support not available in this kernel."); + return -EINVAL; + } + + if ((mp->m_dalign && !mp->m_swidth) || + (!mp->m_dalign && mp->m_swidth)) { + xfs_warn(mp, "sunit and swidth must be specified together"); + return -EINVAL; + } + + if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) { + xfs_warn(mp, + "stripe width (%d) must be a multiple of the stripe unit (%d)", + mp->m_swidth, mp->m_dalign); + return -EINVAL; + } + + if (mp->m_logbufs != -1 && + mp->m_logbufs != 0 && + (mp->m_logbufs < XLOG_MIN_ICLOGS || + mp->m_logbufs > XLOG_MAX_ICLOGS)) { + xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]", + mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS); + return -EINVAL; + } + + if (mp->m_logbsize != -1 && + mp->m_logbsize != 0 && + (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE || + mp->m_logbsize > XLOG_MAX_RECORD_BSIZE || + !is_power_of_2(mp->m_logbsize))) { + xfs_warn(mp, + "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]", + mp->m_logbsize); + return -EINVAL; + } + + if (xfs_has_allocsize(mp) && + (mp->m_allocsize_log > XFS_MAX_IO_LOG || + mp->m_allocsize_log < XFS_MIN_IO_LOG)) { + xfs_warn(mp, "invalid log iosize: %d [not %d-%d]", + mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG); + return -EINVAL; + } + + return 0; +} + +struct dentry * +xfs_debugfs_mkdir( + const char *name, + struct dentry *parent) +{ + struct dentry *child; + + /* Apparently we're expected to ignore error returns?? */ + child = debugfs_create_dir(name, parent); + if (IS_ERR(child)) + return NULL; + + return child; +} + +static int +xfs_fs_fill_super( + struct super_block *sb, + struct fs_context *fc) +{ + struct xfs_mount *mp = sb->s_fs_info; + struct inode *root; + int flags = 0, error; + + mp->m_super = sb; + + /* + * Copy VFS mount flags from the context now that all parameter parsing + * is guaranteed to have been completed by either the old mount API or + * the newer fsopen/fsconfig API. + */ + if (fc->sb_flags & SB_RDONLY) + xfs_set_readonly(mp); + if (fc->sb_flags & SB_DIRSYNC) + mp->m_features |= XFS_FEAT_DIRSYNC; + if (fc->sb_flags & SB_SYNCHRONOUS) + mp->m_features |= XFS_FEAT_WSYNC; + + error = xfs_fs_validate_params(mp); + if (error) + return error; + + if (!sb_min_blocksize(sb, BBSIZE)) { + xfs_err(mp, "unable to set blocksize"); + return -EINVAL; + } + sb->s_xattr = xfs_xattr_handlers; + sb->s_export_op = &xfs_export_operations; +#ifdef CONFIG_XFS_QUOTA + sb->s_qcop = &xfs_quotactl_operations; + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ; +#endif + sb->s_op = &xfs_super_operations; + + /* + * Delay mount work if the debug hook is set. This is debug + * instrumention to coordinate simulation of xfs mount failures with + * VFS superblock operations + */ + if (xfs_globals.mount_delay) { + xfs_notice(mp, "Delaying mount for %d seconds.", + xfs_globals.mount_delay); + msleep(xfs_globals.mount_delay * 1000); + } + + if (fc->sb_flags & SB_SILENT) + flags |= XFS_MFSI_QUIET; + + error = xfs_open_devices(mp); + if (error) + return error; + + if (xfs_debugfs) { + mp->m_debugfs = xfs_debugfs_mkdir(mp->m_super->s_id, + xfs_debugfs); + } else { + mp->m_debugfs = NULL; + } + + error = xfs_init_mount_workqueues(mp); + if (error) + goto out_shutdown_devices; + + error = xfs_init_percpu_counters(mp); + if (error) + goto out_destroy_workqueues; + + error = xfs_inodegc_init_percpu(mp); + if (error) + goto out_destroy_counters; + + /* Allocate stats memory before we do operations that might use it */ + mp->m_stats.xs_stats = alloc_percpu(struct xfsstats); + if (!mp->m_stats.xs_stats) { + error = -ENOMEM; + goto out_destroy_inodegc; + } + + error = xchk_mount_stats_alloc(mp); + if (error) + goto out_free_stats; + + error = xfs_readsb(mp, flags); + if (error) + goto out_free_scrub_stats; + + error = xfs_finish_flags(mp); + if (error) + goto out_free_sb; + + error = xfs_setup_devices(mp); + if (error) + goto out_free_sb; + + /* + * V4 support is undergoing deprecation. + * + * Note: this has to use an open coded m_features check as xfs_has_crc + * always returns false for !CONFIG_XFS_SUPPORT_V4. + */ + if (!(mp->m_features & XFS_FEAT_CRC)) { + if (!IS_ENABLED(CONFIG_XFS_SUPPORT_V4)) { + xfs_warn(mp, + "Deprecated V4 format (crc=0) not supported by kernel."); + error = -EINVAL; + goto out_free_sb; + } + xfs_warn_once(mp, + "Deprecated V4 format (crc=0) will not be supported after September 2030."); + } + + /* ASCII case insensitivity is undergoing deprecation. */ + if (xfs_has_asciici(mp)) { +#ifdef CONFIG_XFS_SUPPORT_ASCII_CI + xfs_warn_once(mp, + "Deprecated ASCII case-insensitivity feature (ascii-ci=1) will not be supported after September 2030."); +#else + xfs_warn(mp, + "Deprecated ASCII case-insensitivity feature (ascii-ci=1) not supported by kernel."); + error = -EINVAL; + goto out_free_sb; +#endif + } + + /* + * Filesystem claims it needs repair, so refuse the mount unless + * norecovery is also specified, in which case the filesystem can + * be mounted with no risk of further damage. + */ + if (xfs_has_needsrepair(mp) && !xfs_has_norecovery(mp)) { + xfs_warn(mp, "Filesystem needs repair. Please run xfs_repair."); + error = -EFSCORRUPTED; + goto out_free_sb; + } + + /* + * Don't touch the filesystem if a user tool thinks it owns the primary + * superblock. mkfs doesn't clear the flag from secondary supers, so + * we don't check them at all. + */ + if (mp->m_sb.sb_inprogress) { + xfs_warn(mp, "Offline file system operation in progress!"); + error = -EFSCORRUPTED; + goto out_free_sb; + } + + if (mp->m_sb.sb_blocksize > PAGE_SIZE) { + size_t max_folio_size = mapping_max_folio_size_supported(); + + if (!xfs_has_crc(mp)) { + xfs_warn(mp, +"V4 Filesystem with blocksize %d bytes. Only pagesize (%ld) or less is supported.", + mp->m_sb.sb_blocksize, PAGE_SIZE); + error = -ENOSYS; + goto out_free_sb; + } + + if (mp->m_sb.sb_blocksize > max_folio_size) { + xfs_warn(mp, +"block size (%u bytes) not supported; Only block size (%zu) or less is supported", + mp->m_sb.sb_blocksize, max_folio_size); + error = -ENOSYS; + goto out_free_sb; + } + } + + /* Ensure this filesystem fits in the page cache limits */ + if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) || + xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) { + xfs_warn(mp, + "file system too large to be mounted on this system."); + error = -EFBIG; + goto out_free_sb; + } + + /* + * XFS block mappings use 54 bits to store the logical block offset. + * This should suffice to handle the maximum file size that the VFS + * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT + * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes + * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON + * to check this assertion. + * + * Avoid integer overflow by comparing the maximum bmbt offset to the + * maximum pagecache offset in units of fs blocks. + */ + if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) { + xfs_warn(mp, +"MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!", + XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE), + XFS_MAX_FILEOFF); + error = -EINVAL; + goto out_free_sb; + } + + error = xfs_rtmount_readsb(mp); + if (error) + goto out_free_sb; + + error = xfs_filestream_mount(mp); + if (error) + goto out_free_rtsb; + + /* + * we must configure the block size in the superblock before we run the + * full mount process as the mount process can lookup and cache inodes. + */ + sb->s_magic = XFS_SUPER_MAGIC; + sb->s_blocksize = mp->m_sb.sb_blocksize; + sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1; + sb->s_maxbytes = MAX_LFS_FILESIZE; + sb->s_max_links = XFS_MAXLINK; + sb->s_time_gran = 1; + if (xfs_has_bigtime(mp)) { + sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN); + sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX); + } else { + sb->s_time_min = XFS_LEGACY_TIME_MIN; + sb->s_time_max = XFS_LEGACY_TIME_MAX; + } + trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max); + sb->s_iflags |= SB_I_CGROUPWB | SB_I_ALLOW_HSM; + + set_posix_acl_flag(sb); + + /* version 5 superblocks support inode version counters. */ + if (xfs_has_crc(mp)) + sb->s_flags |= SB_I_VERSION; + + if (xfs_has_dax_always(mp)) { + error = xfs_setup_dax_always(mp); + if (error) + goto out_filestream_unmount; + } + + if (xfs_has_discard(mp) && !bdev_max_discard_sectors(sb->s_bdev)) { + xfs_warn(mp, + "mounting with \"discard\" option, but the device does not support discard"); + mp->m_features &= ~XFS_FEAT_DISCARD; + } + + if (xfs_has_zoned(mp)) { + if (!xfs_has_metadir(mp)) { + xfs_alert(mp, + "metadir feature required for zoned realtime devices."); + error = -EINVAL; + goto out_filestream_unmount; + } + } + + if (xfs_has_reflink(mp)) { + if (xfs_has_realtime(mp) && + !xfs_reflink_supports_rextsize(mp, mp->m_sb.sb_rextsize)) { + xfs_alert(mp, + "reflink not compatible with realtime extent size %u!", + mp->m_sb.sb_rextsize); + error = -EINVAL; + goto out_filestream_unmount; + } + + if (xfs_has_zoned(mp)) { + xfs_alert(mp, + "reflink not compatible with zoned RT device!"); + error = -EINVAL; + goto out_filestream_unmount; + } + + if (xfs_globals.always_cow) { + xfs_info(mp, "using DEBUG-only always_cow mode."); + mp->m_always_cow = true; + } + } + + /* + * If no quota mount options were provided, maybe we'll try to pick + * up the quota accounting and enforcement flags from the ondisk sb. + */ + if (!(mp->m_qflags & XFS_QFLAGS_MNTOPTS)) + xfs_set_resuming_quotaon(mp); + mp->m_qflags &= ~XFS_QFLAGS_MNTOPTS; + + error = xfs_mountfs(mp); + if (error) + goto out_filestream_unmount; + + root = igrab(VFS_I(mp->m_rootip)); + if (!root) { + error = -ENOENT; + goto out_unmount; + } + sb->s_root = d_make_root(root); + if (!sb->s_root) { + error = -ENOMEM; + goto out_unmount; + } + + return 0; + + out_filestream_unmount: + xfs_filestream_unmount(mp); + out_free_rtsb: + xfs_rtmount_freesb(mp); + out_free_sb: + xfs_freesb(mp); + out_free_scrub_stats: + xchk_mount_stats_free(mp); + out_free_stats: + free_percpu(mp->m_stats.xs_stats); + out_destroy_inodegc: + xfs_inodegc_free_percpu(mp); + out_destroy_counters: + xfs_destroy_percpu_counters(mp); + out_destroy_workqueues: + xfs_destroy_mount_workqueues(mp); + out_shutdown_devices: + xfs_shutdown_devices(mp); + return error; + + out_unmount: + xfs_filestream_unmount(mp); + xfs_unmountfs(mp); + goto out_free_rtsb; +} + +static int +xfs_fs_get_tree( + struct fs_context *fc) +{ + return get_tree_bdev(fc, xfs_fs_fill_super); +} + +static int +xfs_remount_rw( + struct xfs_mount *mp) +{ + struct xfs_sb *sbp = &mp->m_sb; + int error; + + if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp && + xfs_readonly_buftarg(mp->m_logdev_targp)) { + xfs_warn(mp, + "ro->rw transition prohibited by read-only logdev"); + return -EACCES; + } + + if (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp)) { + xfs_warn(mp, + "ro->rw transition prohibited by read-only rtdev"); + return -EACCES; + } + + if (xfs_has_norecovery(mp)) { + xfs_warn(mp, + "ro->rw transition prohibited on norecovery mount"); + return -EINVAL; + } + + if (xfs_sb_is_v5(sbp) && + xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { + xfs_warn(mp, + "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem", + (sbp->sb_features_ro_compat & + XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); + return -EINVAL; + } + + xfs_clear_readonly(mp); + + /* + * If this is the first remount to writeable state we might have some + * superblock changes to update. + */ + if (mp->m_update_sb) { + error = xfs_sync_sb(mp, false); + if (error) { + xfs_warn(mp, "failed to write sb changes"); + return error; + } + mp->m_update_sb = false; + } + + /* + * Fill out the reserve pool if it is empty. Use the stashed value if + * it is non-zero, otherwise go with the default. + */ + xfs_restore_resvblks(mp); + xfs_log_work_queue(mp); + xfs_blockgc_start(mp); + + /* Create the per-AG metadata reservation pool .*/ + error = xfs_fs_reserve_ag_blocks(mp); + if (error && error != -ENOSPC) + return error; + + /* Re-enable the background inode inactivation worker. */ + xfs_inodegc_start(mp); + + /* Restart zone reclaim */ + xfs_zone_gc_start(mp); + + return 0; +} + +static int +xfs_remount_ro( + struct xfs_mount *mp) +{ + struct xfs_icwalk icw = { + .icw_flags = XFS_ICWALK_FLAG_SYNC, + }; + int error; + + /* Flush all the dirty data to disk. */ + error = sync_filesystem(mp->m_super); + if (error) + return error; + + /* + * Cancel background eofb scanning so it cannot race with the final + * log force+buftarg wait and deadlock the remount. + */ + xfs_blockgc_stop(mp); + + /* + * Clear out all remaining COW staging extents and speculative post-EOF + * preallocations so that we don't leave inodes requiring inactivation + * cleanups during reclaim on a read-only mount. We must process every + * cached inode, so this requires a synchronous cache scan. + */ + error = xfs_blockgc_free_space(mp, &icw); + if (error) { + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); + return error; + } + + /* + * Stop the inodegc background worker. xfs_fs_reconfigure already + * flushed all pending inodegc work when it sync'd the filesystem. + * The VFS holds s_umount, so we know that inodes cannot enter + * xfs_fs_destroy_inode during a remount operation. In readonly mode + * we send inodes straight to reclaim, so no inodes will be queued. + */ + xfs_inodegc_stop(mp); + + /* Stop zone reclaim */ + xfs_zone_gc_stop(mp); + + /* Free the per-AG metadata reservation pool. */ + xfs_fs_unreserve_ag_blocks(mp); + + /* + * Before we sync the metadata, we need to free up the reserve block + * pool so that the used block count in the superblock on disk is + * correct at the end of the remount. Stash the current* reserve pool + * size so that if we get remounted rw, we can return it to the same + * size. + */ + xfs_save_resvblks(mp); + + xfs_log_clean(mp); + xfs_set_readonly(mp); + + return 0; +} + +/* + * 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. + */ +static int +xfs_fs_reconfigure( + struct fs_context *fc) +{ + struct xfs_mount *mp = XFS_M(fc->root->d_sb); + struct xfs_mount *new_mp = fc->s_fs_info; + int flags = fc->sb_flags; + int error; + + new_mp->m_qflags &= ~XFS_QFLAGS_MNTOPTS; + + /* version 5 superblocks always support version counters. */ + if (xfs_has_crc(mp)) + fc->sb_flags |= SB_I_VERSION; + + error = xfs_fs_validate_params(new_mp); + if (error) + return error; + + xfs_errortag_copy(mp, new_mp); + + /* Validate new max_atomic_write option before making other changes */ + if (mp->m_awu_max_bytes != new_mp->m_awu_max_bytes) { + error = xfs_set_max_atomic_write_opt(mp, + new_mp->m_awu_max_bytes); + if (error) + return error; + } + + /* inode32 -> inode64 */ + if (xfs_has_small_inums(mp) && !xfs_has_small_inums(new_mp)) { + mp->m_features &= ~XFS_FEAT_SMALL_INUMS; + mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount); + } + + /* inode64 -> inode32 */ + if (!xfs_has_small_inums(mp) && xfs_has_small_inums(new_mp)) { + mp->m_features |= XFS_FEAT_SMALL_INUMS; + mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount); + } + + /* + * Now that mp has been modified according to the remount options, we + * do a final option validation with xfs_finish_flags() just like it is + * just like it is done during mount. We cannot use + * done during mount. We cannot use xfs_finish_flags() on new_mp as it + * contains only the user given options. + */ + error = xfs_finish_flags(mp); + if (error) + return error; + + /* ro -> rw */ + if (xfs_is_readonly(mp) && !(flags & SB_RDONLY)) { + error = xfs_remount_rw(mp); + if (error) + return error; + } + + /* rw -> ro */ + if (!xfs_is_readonly(mp) && (flags & SB_RDONLY)) { + error = xfs_remount_ro(mp); + if (error) + return error; + } + + return 0; +} + +static void +xfs_fs_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_fs_parse_param, + .get_tree = xfs_fs_get_tree, + .reconfigure = xfs_fs_reconfigure, + .free = xfs_fs_free, +}; + +/* + * WARNING: do not initialise any parameters in this function that depend on + * mount option parsing having already been performed as this can be called from + * fsopen() before any parameters have been set. + */ +static int +xfs_init_fs_context( + struct fs_context *fc) +{ + struct xfs_mount *mp; + int i; + + mp = kzalloc_obj(struct xfs_mount); + if (!mp) + return -ENOMEM; +#ifdef DEBUG + mp->m_errortag = kzalloc_objs(*mp->m_errortag, XFS_ERRTAG_MAX); + if (!mp->m_errortag) { + kfree(mp); + return -ENOMEM; + } +#endif + + spin_lock_init(&mp->m_sb_lock); + for (i = 0; i < XG_TYPE_MAX; i++) + xa_init(&mp->m_groups[i].xa); + mutex_init(&mp->m_growlock); + mutex_init(&mp->m_metafile_resv_lock); + INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker); + INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker); + mp->m_kobj.kobject.kset = xfs_kset; + /* + * We don't create the finobt per-ag space reservation until after log + * recovery, so we must set this to true so that an ifree transaction + * started during log recovery will not depend on space reservations + * for finobt expansion. + */ + mp->m_finobt_nores = true; + + /* + * These can be overridden by the mount option parsing. + */ + mp->m_logbufs = -1; + mp->m_logbsize = -1; + mp->m_allocsize_log = 16; /* 64k */ + + xfs_hooks_init(&mp->m_dir_update_hooks); + + fc->s_fs_info = mp; + fc->ops = &xfs_context_ops; + + return 0; +} + +static void +xfs_kill_sb( + struct super_block *sb) +{ + struct xfs_mount *mp = XFS_M(sb); + + if (mp->m_rtdev_targp && mp->m_rtdev_targp != mp->m_ddev_targp) + xfs_restore_bdi_rahead(mp); + kill_block_super(sb); + xfs_mount_free(mp); +} + +static struct file_system_type xfs_fs_type = { + .owner = THIS_MODULE, + .name = "xfs", + .init_fs_context = xfs_init_fs_context, + .parameters = xfs_fs_parameters, + .kill_sb = xfs_kill_sb, + .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_MGTIME | + FS_LBS, +}; +MODULE_ALIAS_FS("xfs"); + +STATIC int __init +xfs_init_caches(void) +{ + int error; + + xfs_buf_cache = kmem_cache_create("xfs_buf", sizeof(struct xfs_buf), 0, + SLAB_HWCACHE_ALIGN | + SLAB_RECLAIM_ACCOUNT, + NULL); + if (!xfs_buf_cache) + goto out; + + xfs_log_ticket_cache = kmem_cache_create("xfs_log_ticket", + sizeof(struct xlog_ticket), + 0, 0, NULL); + if (!xfs_log_ticket_cache) + goto out_destroy_buf_cache; + + error = xfs_btree_init_cur_caches(); + if (error) + goto out_destroy_log_ticket_cache; + + error = rcbagbt_init_cur_cache(); + if (error) + goto out_destroy_btree_cur_cache; + + error = xfs_defer_init_item_caches(); + if (error) + goto out_destroy_rcbagbt_cur_cache; + + xfs_da_state_cache = kmem_cache_create("xfs_da_state", + sizeof(struct xfs_da_state), + 0, 0, NULL); + if (!xfs_da_state_cache) + goto out_destroy_defer_item_cache; + + xfs_ifork_cache = kmem_cache_create("xfs_ifork", + sizeof(struct xfs_ifork), + 0, 0, NULL); + if (!xfs_ifork_cache) + goto out_destroy_da_state_cache; + + xfs_trans_cache = kmem_cache_create("xfs_trans", + sizeof(struct xfs_trans), + 0, 0, NULL); + if (!xfs_trans_cache) + goto out_destroy_ifork_cache; + + + /* + * The size of the cache-allocated buf log item is the maximum + * size possible under XFS. This wastes a little bit of memory, + * but it is much faster. + */ + xfs_buf_item_cache = kmem_cache_create("xfs_buf_item", + sizeof(struct xfs_buf_log_item), + 0, 0, NULL); + if (!xfs_buf_item_cache) + goto out_destroy_trans_cache; + + xfs_efd_cache = kmem_cache_create("xfs_efd_item", + xfs_efd_log_item_sizeof(XFS_EFD_MAX_FAST_EXTENTS), + 0, 0, NULL); + if (!xfs_efd_cache) + goto out_destroy_buf_item_cache; + + xfs_efi_cache = kmem_cache_create("xfs_efi_item", + xfs_efi_log_item_sizeof(XFS_EFI_MAX_FAST_EXTENTS), + 0, 0, NULL); + if (!xfs_efi_cache) + goto out_destroy_efd_cache; + + xfs_inode_cache = kmem_cache_create("xfs_inode", + sizeof(struct xfs_inode), 0, + (SLAB_HWCACHE_ALIGN | + SLAB_RECLAIM_ACCOUNT | + SLAB_ACCOUNT), + xfs_fs_inode_init_once); + if (!xfs_inode_cache) + goto out_destroy_efi_cache; + + xfs_ili_cache = kmem_cache_create("xfs_ili", + sizeof(struct xfs_inode_log_item), 0, + SLAB_RECLAIM_ACCOUNT, + NULL); + if (!xfs_ili_cache) + goto out_destroy_inode_cache; + + xfs_icreate_cache = kmem_cache_create("xfs_icr", + sizeof(struct xfs_icreate_item), + 0, 0, NULL); + if (!xfs_icreate_cache) + goto out_destroy_ili_cache; + + xfs_rud_cache = kmem_cache_create("xfs_rud_item", + sizeof(struct xfs_rud_log_item), + 0, 0, NULL); + if (!xfs_rud_cache) + goto out_destroy_icreate_cache; + + xfs_rui_cache = kmem_cache_create("xfs_rui_item", + xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS), + 0, 0, NULL); + if (!xfs_rui_cache) + goto out_destroy_rud_cache; + + xfs_cud_cache = kmem_cache_create("xfs_cud_item", + sizeof(struct xfs_cud_log_item), + 0, 0, NULL); + if (!xfs_cud_cache) + goto out_destroy_rui_cache; + + xfs_cui_cache = kmem_cache_create("xfs_cui_item", + xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS), + 0, 0, NULL); + if (!xfs_cui_cache) + goto out_destroy_cud_cache; + + xfs_bud_cache = kmem_cache_create("xfs_bud_item", + sizeof(struct xfs_bud_log_item), + 0, 0, NULL); + if (!xfs_bud_cache) + goto out_destroy_cui_cache; + + xfs_bui_cache = kmem_cache_create("xfs_bui_item", + xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS), + 0, 0, NULL); + if (!xfs_bui_cache) + goto out_destroy_bud_cache; + + xfs_attrd_cache = kmem_cache_create("xfs_attrd_item", + sizeof(struct xfs_attrd_log_item), + 0, 0, NULL); + if (!xfs_attrd_cache) + goto out_destroy_bui_cache; + + xfs_attri_cache = kmem_cache_create("xfs_attri_item", + sizeof(struct xfs_attri_log_item), + 0, 0, NULL); + if (!xfs_attri_cache) + goto out_destroy_attrd_cache; + + xfs_iunlink_cache = kmem_cache_create("xfs_iul_item", + sizeof(struct xfs_iunlink_item), + 0, 0, NULL); + if (!xfs_iunlink_cache) + goto out_destroy_attri_cache; + + xfs_xmd_cache = kmem_cache_create("xfs_xmd_item", + sizeof(struct xfs_xmd_log_item), + 0, 0, NULL); + if (!xfs_xmd_cache) + goto out_destroy_iul_cache; + + xfs_xmi_cache = kmem_cache_create("xfs_xmi_item", + sizeof(struct xfs_xmi_log_item), + 0, 0, NULL); + if (!xfs_xmi_cache) + goto out_destroy_xmd_cache; + + xfs_parent_args_cache = kmem_cache_create("xfs_parent_args", + sizeof(struct xfs_parent_args), + 0, 0, NULL); + if (!xfs_parent_args_cache) + goto out_destroy_xmi_cache; + + return 0; + + out_destroy_xmi_cache: + kmem_cache_destroy(xfs_xmi_cache); + out_destroy_xmd_cache: + kmem_cache_destroy(xfs_xmd_cache); + out_destroy_iul_cache: + kmem_cache_destroy(xfs_iunlink_cache); + out_destroy_attri_cache: + kmem_cache_destroy(xfs_attri_cache); + out_destroy_attrd_cache: + kmem_cache_destroy(xfs_attrd_cache); + out_destroy_bui_cache: + kmem_cache_destroy(xfs_bui_cache); + out_destroy_bud_cache: + kmem_cache_destroy(xfs_bud_cache); + out_destroy_cui_cache: + kmem_cache_destroy(xfs_cui_cache); + out_destroy_cud_cache: + kmem_cache_destroy(xfs_cud_cache); + out_destroy_rui_cache: + kmem_cache_destroy(xfs_rui_cache); + out_destroy_rud_cache: + kmem_cache_destroy(xfs_rud_cache); + out_destroy_icreate_cache: + kmem_cache_destroy(xfs_icreate_cache); + out_destroy_ili_cache: + kmem_cache_destroy(xfs_ili_cache); + out_destroy_inode_cache: + kmem_cache_destroy(xfs_inode_cache); + out_destroy_efi_cache: + kmem_cache_destroy(xfs_efi_cache); + out_destroy_efd_cache: + kmem_cache_destroy(xfs_efd_cache); + out_destroy_buf_item_cache: + kmem_cache_destroy(xfs_buf_item_cache); + out_destroy_trans_cache: + kmem_cache_destroy(xfs_trans_cache); + out_destroy_ifork_cache: + kmem_cache_destroy(xfs_ifork_cache); + out_destroy_da_state_cache: + kmem_cache_destroy(xfs_da_state_cache); + out_destroy_defer_item_cache: + xfs_defer_destroy_item_caches(); + out_destroy_rcbagbt_cur_cache: + rcbagbt_destroy_cur_cache(); + out_destroy_btree_cur_cache: + xfs_btree_destroy_cur_caches(); + out_destroy_log_ticket_cache: + kmem_cache_destroy(xfs_log_ticket_cache); + out_destroy_buf_cache: + kmem_cache_destroy(xfs_buf_cache); + out: + return -ENOMEM; +} + +STATIC void +xfs_destroy_caches(void) +{ + /* + * Make sure all delayed rcu free are flushed before we + * destroy caches. + */ + rcu_barrier(); + kmem_cache_destroy(xfs_parent_args_cache); + kmem_cache_destroy(xfs_xmd_cache); + kmem_cache_destroy(xfs_xmi_cache); + kmem_cache_destroy(xfs_iunlink_cache); + kmem_cache_destroy(xfs_attri_cache); + kmem_cache_destroy(xfs_attrd_cache); + kmem_cache_destroy(xfs_bui_cache); + kmem_cache_destroy(xfs_bud_cache); + kmem_cache_destroy(xfs_cui_cache); + kmem_cache_destroy(xfs_cud_cache); + kmem_cache_destroy(xfs_rui_cache); + kmem_cache_destroy(xfs_rud_cache); + kmem_cache_destroy(xfs_icreate_cache); + kmem_cache_destroy(xfs_ili_cache); + kmem_cache_destroy(xfs_inode_cache); + kmem_cache_destroy(xfs_efi_cache); + kmem_cache_destroy(xfs_efd_cache); + kmem_cache_destroy(xfs_buf_item_cache); + kmem_cache_destroy(xfs_trans_cache); + kmem_cache_destroy(xfs_ifork_cache); + kmem_cache_destroy(xfs_da_state_cache); + xfs_defer_destroy_item_caches(); + rcbagbt_destroy_cur_cache(); + xfs_btree_destroy_cur_caches(); + kmem_cache_destroy(xfs_log_ticket_cache); + kmem_cache_destroy(xfs_buf_cache); +} + +STATIC int __init +xfs_init_workqueues(void) +{ + /* + * The allocation workqueue can be used in memory reclaim situations + * (writepage path), and parallelism is only limited by the number of + * AGs in all the filesystems mounted. Hence use the default large + * max_active value for this workqueue. + */ + xfs_alloc_wq = alloc_workqueue("xfsalloc", XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_PERCPU), + 0); + if (!xfs_alloc_wq) + return -ENOMEM; + + xfs_discard_wq = alloc_workqueue("xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND), + 0); + if (!xfs_discard_wq) + goto out_free_alloc_wq; + + return 0; +out_free_alloc_wq: + destroy_workqueue(xfs_alloc_wq); + return -ENOMEM; +} + +STATIC void +xfs_destroy_workqueues(void) +{ + destroy_workqueue(xfs_discard_wq); + destroy_workqueue(xfs_alloc_wq); +} + +STATIC int __init +init_xfs_fs(void) +{ + int error; + + xfs_check_ondisk_structs(); + + error = xfs_dahash_test(); + if (error) + return error; + + printk(KERN_INFO XFS_VERSION_STRING " with " + XFS_BUILD_OPTIONS " enabled\n"); + + xfs_dir_startup(); + + error = xfs_init_caches(); + if (error) + goto out; + + error = xfs_init_workqueues(); + if (error) + goto out_destroy_caches; + + error = xfs_mru_cache_init(); + if (error) + goto out_destroy_wq; + + error = xfs_init_procfs(); + if (error) + goto out_mru_cache_uninit; + + error = xfs_sysctl_register(); + if (error) + goto out_cleanup_procfs; + + xfs_debugfs = xfs_debugfs_mkdir("xfs", NULL); + + xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj); + if (!xfs_kset) { + error = -ENOMEM; + goto out_debugfs_unregister; + } + + xfsstats.xs_kobj.kobject.kset = xfs_kset; + + xfsstats.xs_stats = alloc_percpu(struct xfsstats); + if (!xfsstats.xs_stats) { + error = -ENOMEM; + goto out_kset_unregister; + } + + error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL, + "stats"); + if (error) + goto out_free_stats; + + error = xchk_global_stats_setup(xfs_debugfs); + if (error) + goto out_remove_stats_kobj; + +#ifdef DEBUG + xfs_dbg_kobj.kobject.kset = xfs_kset; + error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug"); + if (error) + goto out_remove_scrub_stats; +#endif + + error = xfs_qm_init(); + if (error) + goto out_remove_dbg_kobj; + + error = register_filesystem(&xfs_fs_type); + if (error) + goto out_qm_exit; + return 0; + + out_qm_exit: + xfs_qm_exit(); + out_remove_dbg_kobj: +#ifdef DEBUG + xfs_sysfs_del(&xfs_dbg_kobj); + out_remove_scrub_stats: +#endif + xchk_global_stats_teardown(); + out_remove_stats_kobj: + xfs_sysfs_del(&xfsstats.xs_kobj); + out_free_stats: + free_percpu(xfsstats.xs_stats); + out_kset_unregister: + kset_unregister(xfs_kset); + out_debugfs_unregister: + debugfs_remove(xfs_debugfs); + xfs_sysctl_unregister(); + out_cleanup_procfs: + xfs_cleanup_procfs(); + out_mru_cache_uninit: + xfs_mru_cache_uninit(); + out_destroy_wq: + xfs_destroy_workqueues(); + out_destroy_caches: + xfs_destroy_caches(); + out: + return error; +} + +STATIC void __exit +exit_xfs_fs(void) +{ + xfs_qm_exit(); + unregister_filesystem(&xfs_fs_type); +#ifdef DEBUG + xfs_sysfs_del(&xfs_dbg_kobj); +#endif + xchk_global_stats_teardown(); + xfs_sysfs_del(&xfsstats.xs_kobj); + free_percpu(xfsstats.xs_stats); + kset_unregister(xfs_kset); + debugfs_remove(xfs_debugfs); + xfs_sysctl_unregister(); + xfs_cleanup_procfs(); + xfs_mru_cache_uninit(); + xfs_destroy_workqueues(); + xfs_destroy_caches(); + xfs_uuid_table_free(); +} + +module_init(init_xfs_fs); +module_exit(exit_xfs_fs); + +MODULE_AUTHOR("Silicon Graphics, Inc."); +MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled"); +MODULE_LICENSE("GPL"); |