mirror of https://github.com/torvalds/linux.git
fs: add fs/super_types.h header
Split out super block associated structures into a separate header. Link: https://patch.msgid.link/20251104-work-fs-header-v1-2-fb39a2efe39e@kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
parent
0485a18d91
commit
e0b62a4dee
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@ -2,6 +2,7 @@
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#ifndef _LINUX_FS_H
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#ifndef _LINUX_FS_H
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#define _LINUX_FS_H
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#define _LINUX_FS_H
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#include <linux/fs/super_types.h>
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#include <linux/vfsdebug.h>
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#include <linux/vfsdebug.h>
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#include <linux/linkage.h>
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#include <linux/linkage.h>
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#include <linux/wait_bit.h>
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#include <linux/wait_bit.h>
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@ -11,7 +12,6 @@
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#include <linux/stat.h>
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#include <linux/stat.h>
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#include <linux/cache.h>
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#include <linux/cache.h>
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#include <linux/list.h>
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#include <linux/list.h>
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#include <linux/list_lru.h>
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#include <linux/llist.h>
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#include <linux/llist.h>
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#include <linux/radix-tree.h>
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#include <linux/radix-tree.h>
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#include <linux/xarray.h>
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#include <linux/xarray.h>
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@ -37,7 +37,6 @@
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#include <linux/uuid.h>
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#include <linux/uuid.h>
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#include <linux/errseq.h>
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#include <linux/errseq.h>
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#include <linux/ioprio.h>
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#include <linux/ioprio.h>
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#include <linux/fs_dirent.h>
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#include <linux/build_bug.h>
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#include <linux/build_bug.h>
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#include <linux/stddef.h>
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#include <linux/stddef.h>
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#include <linux/mount.h>
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#include <linux/mount.h>
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@ -52,11 +51,9 @@
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#include <asm/byteorder.h>
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#include <asm/byteorder.h>
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#include <uapi/linux/fs.h>
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#include <uapi/linux/fs.h>
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struct backing_dev_info;
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struct bdi_writeback;
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struct bdi_writeback;
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struct bio;
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struct bio;
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struct io_comp_batch;
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struct io_comp_batch;
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struct export_operations;
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struct fiemap_extent_info;
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struct fiemap_extent_info;
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struct hd_geometry;
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struct hd_geometry;
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struct iovec;
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struct iovec;
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@ -70,12 +67,8 @@ struct vfsmount;
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struct cred;
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struct cred;
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struct swap_info_struct;
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struct swap_info_struct;
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struct seq_file;
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struct seq_file;
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struct workqueue_struct;
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struct iov_iter;
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struct iov_iter;
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struct fscrypt_operations;
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struct fsverity_operations;
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struct fsnotify_mark_connector;
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struct fsnotify_mark_connector;
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struct fsnotify_sb_info;
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struct fs_context;
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struct fs_context;
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struct fs_parameter_spec;
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struct fs_parameter_spec;
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struct file_kattr;
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struct file_kattr;
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@ -298,11 +291,6 @@ struct iattr {
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struct file *ia_file;
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struct file *ia_file;
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};
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};
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/*
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* Includes for diskquotas.
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*/
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#include <linux/quota.h>
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/*
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/*
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* Maximum number of layers of fs stack. Needs to be limited to
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* Maximum number of layers of fs stack. Needs to be limited to
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* prevent kernel stack overflow
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* prevent kernel stack overflow
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@ -1347,49 +1335,6 @@ extern void f_delown(struct file *filp);
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extern pid_t f_getown(struct file *filp);
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extern pid_t f_getown(struct file *filp);
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extern int send_sigurg(struct file *file);
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extern int send_sigurg(struct file *file);
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/*
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* sb->s_flags. Note that these mirror the equivalent MS_* flags where
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* represented in both.
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*/
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#define SB_RDONLY BIT(0) /* Mount read-only */
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#define SB_NOSUID BIT(1) /* Ignore suid and sgid bits */
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#define SB_NODEV BIT(2) /* Disallow access to device special files */
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#define SB_NOEXEC BIT(3) /* Disallow program execution */
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#define SB_SYNCHRONOUS BIT(4) /* Writes are synced at once */
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#define SB_MANDLOCK BIT(6) /* Allow mandatory locks on an FS */
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#define SB_DIRSYNC BIT(7) /* Directory modifications are synchronous */
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#define SB_NOATIME BIT(10) /* Do not update access times. */
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#define SB_NODIRATIME BIT(11) /* Do not update directory access times */
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#define SB_SILENT BIT(15)
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#define SB_POSIXACL BIT(16) /* Supports POSIX ACLs */
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#define SB_INLINECRYPT BIT(17) /* Use blk-crypto for encrypted files */
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#define SB_KERNMOUNT BIT(22) /* this is a kern_mount call */
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#define SB_I_VERSION BIT(23) /* Update inode I_version field */
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#define SB_LAZYTIME BIT(25) /* Update the on-disk [acm]times lazily */
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/* These sb flags are internal to the kernel */
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#define SB_DEAD BIT(21)
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#define SB_DYING BIT(24)
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#define SB_FORCE BIT(27)
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#define SB_NOSEC BIT(28)
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#define SB_BORN BIT(29)
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#define SB_ACTIVE BIT(30)
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#define SB_NOUSER BIT(31)
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/* These flags relate to encoding and casefolding */
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#define SB_ENC_STRICT_MODE_FL (1 << 0)
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#define SB_ENC_NO_COMPAT_FALLBACK_FL (1 << 1)
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#define sb_has_strict_encoding(sb) \
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(sb->s_encoding_flags & SB_ENC_STRICT_MODE_FL)
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#if IS_ENABLED(CONFIG_UNICODE)
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#define sb_no_casefold_compat_fallback(sb) \
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(sb->s_encoding_flags & SB_ENC_NO_COMPAT_FALLBACK_FL)
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#else
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#define sb_no_casefold_compat_fallback(sb) (1)
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#endif
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/*
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/*
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* Umount options
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* Umount options
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*/
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*/
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#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
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#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
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#define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
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#define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
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/* sb->s_iflags */
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#define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */
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#define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */
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#define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */
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#define SB_I_STABLE_WRITES 0x00000008 /* don't modify blks until WB is done */
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/* sb->s_iflags to limit user namespace mounts */
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#define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */
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#define SB_I_IMA_UNVERIFIABLE_SIGNATURE 0x00000020
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#define SB_I_UNTRUSTED_MOUNTER 0x00000040
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#define SB_I_EVM_HMAC_UNSUPPORTED 0x00000080
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#define SB_I_SKIP_SYNC 0x00000100 /* Skip superblock at global sync */
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#define SB_I_PERSB_BDI 0x00000200 /* has a per-sb bdi */
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#define SB_I_TS_EXPIRY_WARNED 0x00000400 /* warned about timestamp range expiry */
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#define SB_I_RETIRED 0x00000800 /* superblock shouldn't be reused */
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#define SB_I_NOUMASK 0x00001000 /* VFS does not apply umask */
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#define SB_I_NOIDMAP 0x00002000 /* No idmapped mounts on this superblock */
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#define SB_I_ALLOW_HSM 0x00004000 /* Allow HSM events on this superblock */
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/* Possible states of 'frozen' field */
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enum {
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SB_UNFROZEN = 0, /* FS is unfrozen */
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SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */
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SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */
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SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop
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* internal threads if needed) */
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SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */
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};
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#define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
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struct sb_writers {
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unsigned short frozen; /* Is sb frozen? */
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int freeze_kcount; /* How many kernel freeze requests? */
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int freeze_ucount; /* How many userspace freeze requests? */
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const void *freeze_owner; /* Owner of the freeze */
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struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS];
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};
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struct mount;
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struct super_block {
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struct list_head s_list; /* Keep this first */
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dev_t s_dev; /* search index; _not_ kdev_t */
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unsigned char s_blocksize_bits;
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unsigned long s_blocksize;
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loff_t s_maxbytes; /* Max file size */
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struct file_system_type *s_type;
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const struct super_operations *s_op;
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const struct dquot_operations *dq_op;
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const struct quotactl_ops *s_qcop;
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const struct export_operations *s_export_op;
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unsigned long s_flags;
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unsigned long s_iflags; /* internal SB_I_* flags */
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unsigned long s_magic;
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struct dentry *s_root;
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struct rw_semaphore s_umount;
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int s_count;
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atomic_t s_active;
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#ifdef CONFIG_SECURITY
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void *s_security;
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#endif
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const struct xattr_handler * const *s_xattr;
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#ifdef CONFIG_FS_ENCRYPTION
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const struct fscrypt_operations *s_cop;
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struct fscrypt_keyring *s_master_keys; /* master crypto keys in use */
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#endif
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#ifdef CONFIG_FS_VERITY
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const struct fsverity_operations *s_vop;
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#endif
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#if IS_ENABLED(CONFIG_UNICODE)
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struct unicode_map *s_encoding;
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__u16 s_encoding_flags;
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#endif
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struct hlist_bl_head s_roots; /* alternate root dentries for NFS */
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struct mount *s_mounts; /* list of mounts; _not_ for fs use */
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struct block_device *s_bdev; /* can go away once we use an accessor for @s_bdev_file */
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struct file *s_bdev_file;
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struct backing_dev_info *s_bdi;
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struct mtd_info *s_mtd;
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struct hlist_node s_instances;
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unsigned int s_quota_types; /* Bitmask of supported quota types */
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struct quota_info s_dquot; /* Diskquota specific options */
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struct sb_writers s_writers;
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/*
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* Keep s_fs_info, s_time_gran, s_fsnotify_mask, and
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* s_fsnotify_info together for cache efficiency. They are frequently
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* accessed and rarely modified.
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*/
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void *s_fs_info; /* Filesystem private info */
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/* Granularity of c/m/atime in ns (cannot be worse than a second) */
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u32 s_time_gran;
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/* Time limits for c/m/atime in seconds */
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time64_t s_time_min;
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time64_t s_time_max;
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#ifdef CONFIG_FSNOTIFY
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u32 s_fsnotify_mask;
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struct fsnotify_sb_info *s_fsnotify_info;
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#endif
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/*
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* q: why are s_id and s_sysfs_name not the same? both are human
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* readable strings that identify the filesystem
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* a: s_id is allowed to change at runtime; it's used in log messages,
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* and we want to when a device starts out as single device (s_id is dev
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* name) but then a device is hot added and we have to switch to
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* identifying it by UUID
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* but s_sysfs_name is a handle for programmatic access, and can't
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* change at runtime
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*/
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char s_id[32]; /* Informational name */
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uuid_t s_uuid; /* UUID */
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u8 s_uuid_len; /* Default 16, possibly smaller for weird filesystems */
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/* if set, fs shows up under sysfs at /sys/fs/$FSTYP/s_sysfs_name */
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char s_sysfs_name[UUID_STRING_LEN + 1];
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unsigned int s_max_links;
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unsigned int s_d_flags; /* default d_flags for dentries */
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/*
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* The next field is for VFS *only*. No filesystems have any business
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* even looking at it. You had been warned.
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*/
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struct mutex s_vfs_rename_mutex; /* Kludge */
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/*
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* Filesystem subtype. If non-empty the filesystem type field
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* in /proc/mounts will be "type.subtype"
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*/
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const char *s_subtype;
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const struct dentry_operations *__s_d_op; /* default d_op for dentries */
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struct shrinker *s_shrink; /* per-sb shrinker handle */
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/* Number of inodes with nlink == 0 but still referenced */
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atomic_long_t s_remove_count;
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/* Read-only state of the superblock is being changed */
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int s_readonly_remount;
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/* per-sb errseq_t for reporting writeback errors via syncfs */
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errseq_t s_wb_err;
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/* AIO completions deferred from interrupt context */
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struct workqueue_struct *s_dio_done_wq;
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struct hlist_head s_pins;
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/*
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* Owning user namespace and default context in which to
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* interpret filesystem uids, gids, quotas, device nodes,
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* xattrs and security labels.
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*/
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struct user_namespace *s_user_ns;
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/*
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* The list_lru structure is essentially just a pointer to a table
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* of per-node lru lists, each of which has its own spinlock.
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* There is no need to put them into separate cachelines.
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*/
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struct list_lru s_dentry_lru;
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struct list_lru s_inode_lru;
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struct rcu_head rcu;
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struct work_struct destroy_work;
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struct mutex s_sync_lock; /* sync serialisation lock */
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/*
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* Indicates how deep in a filesystem stack this SB is
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*/
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int s_stack_depth;
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/* s_inode_list_lock protects s_inodes */
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spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp;
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struct list_head s_inodes; /* all inodes */
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spinlock_t s_inode_wblist_lock;
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struct list_head s_inodes_wb; /* writeback inodes */
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} __randomize_layout;
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static inline struct user_namespace *i_user_ns(const struct inode *inode)
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static inline struct user_namespace *i_user_ns(const struct inode *inode)
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{
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{
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return inode->i_sb->s_user_ns;
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return inode->i_sb->s_user_ns;
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@ -2431,72 +2191,6 @@ extern loff_t vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
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struct file *dst_file, loff_t dst_pos,
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struct file *dst_file, loff_t dst_pos,
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loff_t len, unsigned int remap_flags);
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loff_t len, unsigned int remap_flags);
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/**
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* enum freeze_holder - holder of the freeze
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* @FREEZE_HOLDER_KERNEL: kernel wants to freeze or thaw filesystem
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* @FREEZE_HOLDER_USERSPACE: userspace wants to freeze or thaw filesystem
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* @FREEZE_MAY_NEST: whether nesting freeze and thaw requests is allowed
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* @FREEZE_EXCL: a freeze that can only be undone by the owner
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*
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* Indicate who the owner of the freeze or thaw request is and whether
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* the freeze needs to be exclusive or can nest.
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* Without @FREEZE_MAY_NEST, multiple freeze and thaw requests from the
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* same holder aren't allowed. It is however allowed to hold a single
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* @FREEZE_HOLDER_USERSPACE and a single @FREEZE_HOLDER_KERNEL freeze at
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* the same time. This is relied upon by some filesystems during online
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* repair or similar.
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*/
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||||||
enum freeze_holder {
|
|
||||||
FREEZE_HOLDER_KERNEL = (1U << 0),
|
|
||||||
FREEZE_HOLDER_USERSPACE = (1U << 1),
|
|
||||||
FREEZE_MAY_NEST = (1U << 2),
|
|
||||||
FREEZE_EXCL = (1U << 3),
|
|
||||||
};
|
|
||||||
|
|
||||||
struct super_operations {
|
|
||||||
struct inode *(*alloc_inode)(struct super_block *sb);
|
|
||||||
void (*destroy_inode)(struct inode *);
|
|
||||||
void (*free_inode)(struct inode *);
|
|
||||||
|
|
||||||
void (*dirty_inode) (struct inode *, int flags);
|
|
||||||
int (*write_inode) (struct inode *, struct writeback_control *wbc);
|
|
||||||
int (*drop_inode) (struct inode *);
|
|
||||||
void (*evict_inode) (struct inode *);
|
|
||||||
void (*put_super) (struct super_block *);
|
|
||||||
int (*sync_fs)(struct super_block *sb, int wait);
|
|
||||||
int (*freeze_super) (struct super_block *, enum freeze_holder who, const void *owner);
|
|
||||||
int (*freeze_fs) (struct super_block *);
|
|
||||||
int (*thaw_super) (struct super_block *, enum freeze_holder who, const void *owner);
|
|
||||||
int (*unfreeze_fs) (struct super_block *);
|
|
||||||
int (*statfs) (struct dentry *, struct kstatfs *);
|
|
||||||
int (*remount_fs) (struct super_block *, int *, char *);
|
|
||||||
void (*umount_begin) (struct super_block *);
|
|
||||||
|
|
||||||
int (*show_options)(struct seq_file *, struct dentry *);
|
|
||||||
int (*show_devname)(struct seq_file *, struct dentry *);
|
|
||||||
int (*show_path)(struct seq_file *, struct dentry *);
|
|
||||||
int (*show_stats)(struct seq_file *, struct dentry *);
|
|
||||||
#ifdef CONFIG_QUOTA
|
|
||||||
ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
|
|
||||||
ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
|
|
||||||
struct dquot __rcu **(*get_dquots)(struct inode *);
|
|
||||||
#endif
|
|
||||||
long (*nr_cached_objects)(struct super_block *,
|
|
||||||
struct shrink_control *);
|
|
||||||
long (*free_cached_objects)(struct super_block *,
|
|
||||||
struct shrink_control *);
|
|
||||||
/*
|
|
||||||
* If a filesystem can support graceful removal of a device and
|
|
||||||
* continue read-write operations, implement this callback.
|
|
||||||
*
|
|
||||||
* Return 0 if the filesystem can continue read-write.
|
|
||||||
* Non-zero return value or no such callback means the fs will be shutdown
|
|
||||||
* as usual.
|
|
||||||
*/
|
|
||||||
int (*remove_bdev)(struct super_block *sb, struct block_device *bdev);
|
|
||||||
void (*shutdown)(struct super_block *sb);
|
|
||||||
};
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Inode flags - they have no relation to superblock flags now
|
* Inode flags - they have no relation to superblock flags now
|
||||||
*/
|
*/
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,335 @@
|
||||||
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||||||
|
#ifndef _LINUX_FS_SUPER_TYPES_H
|
||||||
|
#define _LINUX_FS_SUPER_TYPES_H
|
||||||
|
|
||||||
|
#include <linux/fs_dirent.h>
|
||||||
|
#include <linux/errseq.h>
|
||||||
|
#include <linux/list_lru.h>
|
||||||
|
#include <linux/list.h>
|
||||||
|
#include <linux/list_bl.h>
|
||||||
|
#include <linux/llist.h>
|
||||||
|
#include <linux/uidgid.h>
|
||||||
|
#include <linux/uuid.h>
|
||||||
|
#include <linux/percpu-rwsem.h>
|
||||||
|
#include <linux/workqueue_types.h>
|
||||||
|
#include <linux/quota.h>
|
||||||
|
|
||||||
|
struct backing_dev_info;
|
||||||
|
struct block_device;
|
||||||
|
struct dentry;
|
||||||
|
struct dentry_operations;
|
||||||
|
struct dquot_operations;
|
||||||
|
struct export_operations;
|
||||||
|
struct file;
|
||||||
|
struct file_system_type;
|
||||||
|
struct fscrypt_operations;
|
||||||
|
struct fsnotify_sb_info;
|
||||||
|
struct fsverity_operations;
|
||||||
|
struct kstatfs;
|
||||||
|
struct mount;
|
||||||
|
struct mtd_info;
|
||||||
|
struct quotactl_ops;
|
||||||
|
struct shrinker;
|
||||||
|
struct unicode_map;
|
||||||
|
struct user_namespace;
|
||||||
|
struct workqueue_struct;
|
||||||
|
struct writeback_control;
|
||||||
|
struct xattr_handler;
|
||||||
|
|
||||||
|
extern struct super_block *blockdev_superblock;
|
||||||
|
|
||||||
|
/* Possible states of 'frozen' field */
|
||||||
|
enum {
|
||||||
|
SB_UNFROZEN = 0, /* FS is unfrozen */
|
||||||
|
SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */
|
||||||
|
SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */
|
||||||
|
SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop internal threads if needed) */
|
||||||
|
SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */
|
||||||
|
};
|
||||||
|
|
||||||
|
#define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
|
||||||
|
|
||||||
|
struct sb_writers {
|
||||||
|
unsigned short frozen; /* Is sb frozen? */
|
||||||
|
int freeze_kcount; /* How many kernel freeze requests? */
|
||||||
|
int freeze_ucount; /* How many userspace freeze requests? */
|
||||||
|
const void *freeze_owner; /* Owner of the freeze */
|
||||||
|
struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS];
|
||||||
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* enum freeze_holder - holder of the freeze
|
||||||
|
* @FREEZE_HOLDER_KERNEL: kernel wants to freeze or thaw filesystem
|
||||||
|
* @FREEZE_HOLDER_USERSPACE: userspace wants to freeze or thaw filesystem
|
||||||
|
* @FREEZE_MAY_NEST: whether nesting freeze and thaw requests is allowed
|
||||||
|
* @FREEZE_EXCL: a freeze that can only be undone by the owner
|
||||||
|
*
|
||||||
|
* Indicate who the owner of the freeze or thaw request is and whether
|
||||||
|
* the freeze needs to be exclusive or can nest.
|
||||||
|
* Without @FREEZE_MAY_NEST, multiple freeze and thaw requests from the
|
||||||
|
* same holder aren't allowed. It is however allowed to hold a single
|
||||||
|
* @FREEZE_HOLDER_USERSPACE and a single @FREEZE_HOLDER_KERNEL freeze at
|
||||||
|
* the same time. This is relied upon by some filesystems during online
|
||||||
|
* repair or similar.
|
||||||
|
*/
|
||||||
|
enum freeze_holder {
|
||||||
|
FREEZE_HOLDER_KERNEL = (1U << 0),
|
||||||
|
FREEZE_HOLDER_USERSPACE = (1U << 1),
|
||||||
|
FREEZE_MAY_NEST = (1U << 2),
|
||||||
|
FREEZE_EXCL = (1U << 3),
|
||||||
|
};
|
||||||
|
|
||||||
|
struct super_operations {
|
||||||
|
struct inode *(*alloc_inode)(struct super_block *sb);
|
||||||
|
void (*destroy_inode)(struct inode *inode);
|
||||||
|
void (*free_inode)(struct inode *inode);
|
||||||
|
void (*dirty_inode)(struct inode *inode, int flags);
|
||||||
|
int (*write_inode)(struct inode *inode, struct writeback_control *wbc);
|
||||||
|
int (*drop_inode)(struct inode *inode);
|
||||||
|
void (*evict_inode)(struct inode *inode);
|
||||||
|
void (*put_super)(struct super_block *sb);
|
||||||
|
int (*sync_fs)(struct super_block *sb, int wait);
|
||||||
|
int (*freeze_super)(struct super_block *sb, enum freeze_holder who,
|
||||||
|
const void *owner);
|
||||||
|
int (*freeze_fs)(struct super_block *sb);
|
||||||
|
int (*thaw_super)(struct super_block *sb, enum freeze_holder who,
|
||||||
|
const void *owner);
|
||||||
|
int (*unfreeze_fs)(struct super_block *sb);
|
||||||
|
int (*statfs)(struct dentry *dentry, struct kstatfs *kstatfs);
|
||||||
|
int (*remount_fs) (struct super_block *, int *, char *);
|
||||||
|
void (*umount_begin)(struct super_block *sb);
|
||||||
|
|
||||||
|
int (*show_options)(struct seq_file *seq, struct dentry *dentry);
|
||||||
|
int (*show_devname)(struct seq_file *seq, struct dentry *dentry);
|
||||||
|
int (*show_path)(struct seq_file *seq, struct dentry *dentry);
|
||||||
|
int (*show_stats)(struct seq_file *seq, struct dentry *dentry);
|
||||||
|
#ifdef CONFIG_QUOTA
|
||||||
|
ssize_t (*quota_read)(struct super_block *sb, int type, char *data,
|
||||||
|
size_t len, loff_t off);
|
||||||
|
ssize_t (*quota_write)(struct super_block *sb, int type,
|
||||||
|
const char *data, size_t len, loff_t off);
|
||||||
|
struct dquot __rcu **(*get_dquots)(struct inode *inode);
|
||||||
|
#endif
|
||||||
|
long (*nr_cached_objects)(struct super_block *sb,
|
||||||
|
struct shrink_control *sc);
|
||||||
|
long (*free_cached_objects)(struct super_block *sb,
|
||||||
|
struct shrink_control *sc);
|
||||||
|
/*
|
||||||
|
* If a filesystem can support graceful removal of a device and
|
||||||
|
* continue read-write operations, implement this callback.
|
||||||
|
*
|
||||||
|
* Return 0 if the filesystem can continue read-write.
|
||||||
|
* Non-zero return value or no such callback means the fs will be shutdown
|
||||||
|
* as usual.
|
||||||
|
*/
|
||||||
|
int (*remove_bdev)(struct super_block *sb, struct block_device *bdev);
|
||||||
|
void (*shutdown)(struct super_block *sb);
|
||||||
|
};
|
||||||
|
|
||||||
|
struct super_block {
|
||||||
|
struct list_head s_list; /* Keep this first */
|
||||||
|
dev_t s_dev; /* search index; _not_ kdev_t */
|
||||||
|
unsigned char s_blocksize_bits;
|
||||||
|
unsigned long s_blocksize;
|
||||||
|
loff_t s_maxbytes; /* Max file size */
|
||||||
|
struct file_system_type *s_type;
|
||||||
|
const struct super_operations *s_op;
|
||||||
|
const struct dquot_operations *dq_op;
|
||||||
|
const struct quotactl_ops *s_qcop;
|
||||||
|
const struct export_operations *s_export_op;
|
||||||
|
unsigned long s_flags;
|
||||||
|
unsigned long s_iflags; /* internal SB_I_* flags */
|
||||||
|
unsigned long s_magic;
|
||||||
|
struct dentry *s_root;
|
||||||
|
struct rw_semaphore s_umount;
|
||||||
|
int s_count;
|
||||||
|
atomic_t s_active;
|
||||||
|
#ifdef CONFIG_SECURITY
|
||||||
|
void *s_security;
|
||||||
|
#endif
|
||||||
|
const struct xattr_handler *const *s_xattr;
|
||||||
|
#ifdef CONFIG_FS_ENCRYPTION
|
||||||
|
const struct fscrypt_operations *s_cop;
|
||||||
|
struct fscrypt_keyring *s_master_keys; /* master crypto keys in use */
|
||||||
|
#endif
|
||||||
|
#ifdef CONFIG_FS_VERITY
|
||||||
|
const struct fsverity_operations *s_vop;
|
||||||
|
#endif
|
||||||
|
#if IS_ENABLED(CONFIG_UNICODE)
|
||||||
|
struct unicode_map *s_encoding;
|
||||||
|
__u16 s_encoding_flags;
|
||||||
|
#endif
|
||||||
|
struct hlist_bl_head s_roots; /* alternate root dentries for NFS */
|
||||||
|
struct mount *s_mounts; /* list of mounts; _not_ for fs use */
|
||||||
|
struct block_device *s_bdev; /* can go away once we use an accessor for @s_bdev_file */
|
||||||
|
struct file *s_bdev_file;
|
||||||
|
struct backing_dev_info *s_bdi;
|
||||||
|
struct mtd_info *s_mtd;
|
||||||
|
struct hlist_node s_instances;
|
||||||
|
unsigned int s_quota_types; /* Bitmask of supported quota types */
|
||||||
|
struct quota_info s_dquot; /* Diskquota specific options */
|
||||||
|
|
||||||
|
struct sb_writers s_writers;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Keep s_fs_info, s_time_gran, s_fsnotify_mask, and
|
||||||
|
* s_fsnotify_info together for cache efficiency. They are frequently
|
||||||
|
* accessed and rarely modified.
|
||||||
|
*/
|
||||||
|
void *s_fs_info; /* Filesystem private info */
|
||||||
|
|
||||||
|
/* Granularity of c/m/atime in ns (cannot be worse than a second) */
|
||||||
|
u32 s_time_gran;
|
||||||
|
/* Time limits for c/m/atime in seconds */
|
||||||
|
time64_t s_time_min;
|
||||||
|
time64_t s_time_max;
|
||||||
|
#ifdef CONFIG_FSNOTIFY
|
||||||
|
u32 s_fsnotify_mask;
|
||||||
|
struct fsnotify_sb_info *s_fsnotify_info;
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* q: why are s_id and s_sysfs_name not the same? both are human
|
||||||
|
* readable strings that identify the filesystem
|
||||||
|
* a: s_id is allowed to change at runtime; it's used in log messages,
|
||||||
|
* and we want to when a device starts out as single device (s_id is dev
|
||||||
|
* name) but then a device is hot added and we have to switch to
|
||||||
|
* identifying it by UUID
|
||||||
|
* but s_sysfs_name is a handle for programmatic access, and can't
|
||||||
|
* change at runtime
|
||||||
|
*/
|
||||||
|
char s_id[32]; /* Informational name */
|
||||||
|
uuid_t s_uuid; /* UUID */
|
||||||
|
u8 s_uuid_len; /* Default 16, possibly smaller for weird filesystems */
|
||||||
|
|
||||||
|
/* if set, fs shows up under sysfs at /sys/fs/$FSTYP/s_sysfs_name */
|
||||||
|
char s_sysfs_name[UUID_STRING_LEN + 1];
|
||||||
|
|
||||||
|
unsigned int s_max_links;
|
||||||
|
unsigned int s_d_flags; /* default d_flags for dentries */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The next field is for VFS *only*. No filesystems have any business
|
||||||
|
* even looking at it. You had been warned.
|
||||||
|
*/
|
||||||
|
struct mutex s_vfs_rename_mutex; /* Kludge */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Filesystem subtype. If non-empty the filesystem type field
|
||||||
|
* in /proc/mounts will be "type.subtype"
|
||||||
|
*/
|
||||||
|
const char *s_subtype;
|
||||||
|
|
||||||
|
const struct dentry_operations *__s_d_op; /* default d_op for dentries */
|
||||||
|
|
||||||
|
struct shrinker *s_shrink; /* per-sb shrinker handle */
|
||||||
|
|
||||||
|
/* Number of inodes with nlink == 0 but still referenced */
|
||||||
|
atomic_long_t s_remove_count;
|
||||||
|
|
||||||
|
/* Read-only state of the superblock is being changed */
|
||||||
|
int s_readonly_remount;
|
||||||
|
|
||||||
|
/* per-sb errseq_t for reporting writeback errors via syncfs */
|
||||||
|
errseq_t s_wb_err;
|
||||||
|
|
||||||
|
/* AIO completions deferred from interrupt context */
|
||||||
|
struct workqueue_struct *s_dio_done_wq;
|
||||||
|
struct hlist_head s_pins;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Owning user namespace and default context in which to
|
||||||
|
* interpret filesystem uids, gids, quotas, device nodes,
|
||||||
|
* xattrs and security labels.
|
||||||
|
*/
|
||||||
|
struct user_namespace *s_user_ns;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The list_lru structure is essentially just a pointer to a table
|
||||||
|
* of per-node lru lists, each of which has its own spinlock.
|
||||||
|
* There is no need to put them into separate cachelines.
|
||||||
|
*/
|
||||||
|
struct list_lru s_dentry_lru;
|
||||||
|
struct list_lru s_inode_lru;
|
||||||
|
struct rcu_head rcu;
|
||||||
|
struct work_struct destroy_work;
|
||||||
|
|
||||||
|
struct mutex s_sync_lock; /* sync serialisation lock */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Indicates how deep in a filesystem stack this SB is
|
||||||
|
*/
|
||||||
|
int s_stack_depth;
|
||||||
|
|
||||||
|
/* s_inode_list_lock protects s_inodes */
|
||||||
|
spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp;
|
||||||
|
struct list_head s_inodes; /* all inodes */
|
||||||
|
|
||||||
|
spinlock_t s_inode_wblist_lock;
|
||||||
|
struct list_head s_inodes_wb; /* writeback inodes */
|
||||||
|
} __randomize_layout;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* sb->s_flags. Note that these mirror the equivalent MS_* flags where
|
||||||
|
* represented in both.
|
||||||
|
*/
|
||||||
|
#define SB_RDONLY BIT(0) /* Mount read-only */
|
||||||
|
#define SB_NOSUID BIT(1) /* Ignore suid and sgid bits */
|
||||||
|
#define SB_NODEV BIT(2) /* Disallow access to device special files */
|
||||||
|
#define SB_NOEXEC BIT(3) /* Disallow program execution */
|
||||||
|
#define SB_SYNCHRONOUS BIT(4) /* Writes are synced at once */
|
||||||
|
#define SB_MANDLOCK BIT(6) /* Allow mandatory locks on an FS */
|
||||||
|
#define SB_DIRSYNC BIT(7) /* Directory modifications are synchronous */
|
||||||
|
#define SB_NOATIME BIT(10) /* Do not update access times. */
|
||||||
|
#define SB_NODIRATIME BIT(11) /* Do not update directory access times */
|
||||||
|
#define SB_SILENT BIT(15)
|
||||||
|
#define SB_POSIXACL BIT(16) /* Supports POSIX ACLs */
|
||||||
|
#define SB_INLINECRYPT BIT(17) /* Use blk-crypto for encrypted files */
|
||||||
|
#define SB_KERNMOUNT BIT(22) /* this is a kern_mount call */
|
||||||
|
#define SB_I_VERSION BIT(23) /* Update inode I_version field */
|
||||||
|
#define SB_LAZYTIME BIT(25) /* Update the on-disk [acm]times lazily */
|
||||||
|
|
||||||
|
/* These sb flags are internal to the kernel */
|
||||||
|
#define SB_DEAD BIT(21)
|
||||||
|
#define SB_DYING BIT(24)
|
||||||
|
#define SB_FORCE BIT(27)
|
||||||
|
#define SB_NOSEC BIT(28)
|
||||||
|
#define SB_BORN BIT(29)
|
||||||
|
#define SB_ACTIVE BIT(30)
|
||||||
|
#define SB_NOUSER BIT(31)
|
||||||
|
|
||||||
|
/* These flags relate to encoding and casefolding */
|
||||||
|
#define SB_ENC_STRICT_MODE_FL (1 << 0)
|
||||||
|
#define SB_ENC_NO_COMPAT_FALLBACK_FL (1 << 1)
|
||||||
|
|
||||||
|
#define sb_has_strict_encoding(sb) \
|
||||||
|
(sb->s_encoding_flags & SB_ENC_STRICT_MODE_FL)
|
||||||
|
|
||||||
|
#if IS_ENABLED(CONFIG_UNICODE)
|
||||||
|
#define sb_no_casefold_compat_fallback(sb) \
|
||||||
|
(sb->s_encoding_flags & SB_ENC_NO_COMPAT_FALLBACK_FL)
|
||||||
|
#else
|
||||||
|
#define sb_no_casefold_compat_fallback(sb) (1)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* sb->s_iflags */
|
||||||
|
#define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */
|
||||||
|
#define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */
|
||||||
|
#define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */
|
||||||
|
#define SB_I_STABLE_WRITES 0x00000008 /* don't modify blks until WB is done */
|
||||||
|
|
||||||
|
/* sb->s_iflags to limit user namespace mounts */
|
||||||
|
#define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */
|
||||||
|
#define SB_I_IMA_UNVERIFIABLE_SIGNATURE 0x00000020
|
||||||
|
#define SB_I_UNTRUSTED_MOUNTER 0x00000040
|
||||||
|
#define SB_I_EVM_HMAC_UNSUPPORTED 0x00000080
|
||||||
|
|
||||||
|
#define SB_I_SKIP_SYNC 0x00000100 /* Skip superblock at global sync */
|
||||||
|
#define SB_I_PERSB_BDI 0x00000200 /* has a per-sb bdi */
|
||||||
|
#define SB_I_TS_EXPIRY_WARNED 0x00000400 /* warned about timestamp range expiry */
|
||||||
|
#define SB_I_RETIRED 0x00000800 /* superblock shouldn't be reused */
|
||||||
|
#define SB_I_NOUMASK 0x00001000 /* VFS does not apply umask */
|
||||||
|
#define SB_I_NOIDMAP 0x00002000 /* No idmapped mounts on this superblock */
|
||||||
|
#define SB_I_ALLOW_HSM 0x00004000 /* Allow HSM events on this superblock */
|
||||||
|
|
||||||
|
#endif /* _LINUX_FS_SUPER_TYPES_H */
|
||||||
Loading…
Reference in New Issue