diff options
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 192 |
1 files changed, 162 insertions, 30 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index ec8f3ddf4a6a..c3c88fdb9b2a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -70,6 +70,7 @@ struct fsverity_info; struct fsverity_operations; struct fs_context; struct fs_parameter_spec; +struct fileattr; extern void __init inode_init(void); extern void __init inode_init_early(void); @@ -144,7 +145,7 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, /* Expect random access pattern */ #define FMODE_RANDOM ((__force fmode_t)0x1000) -/* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ +/* File is huge (eg. /dev/mem): treat loff_t as unsigned */ #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) /* File is opened with O_PATH; almost nothing can be done with it */ @@ -441,7 +442,6 @@ int pagecache_write_end(struct file *, struct address_space *mapping, * @i_mmap: Tree of private and shared mappings. * @i_mmap_rwsem: Protects @i_mmap and @i_mmap_writable. * @nrpages: Number of page entries, protected by the i_pages lock. - * @nrexceptional: Shadow or DAX entries, protected by the i_pages lock. * @writeback_index: Writeback starts here. * @a_ops: Methods. * @flags: Error bits and flags (AS_*). @@ -462,7 +462,6 @@ struct address_space { struct rb_root_cached i_mmap; struct rw_semaphore i_mmap_rwsem; unsigned long nrpages; - unsigned long nrexceptional; pgoff_t writeback_index; const struct address_space_operations *a_ops; unsigned long flags; @@ -891,18 +890,22 @@ struct fown_struct { int signum; /* posix.1b rt signal to be delivered on IO */ }; -/* - * Track a single file's readahead state +/** + * struct file_ra_state - Track a file's readahead state. + * @start: Where the most recent readahead started. + * @size: Number of pages read in the most recent readahead. + * @async_size: Start next readahead when this many pages are left. + * @ra_pages: Maximum size of a readahead request. + * @mmap_miss: How many mmap accesses missed in the page cache. + * @prev_pos: The last byte in the most recent read request. */ struct file_ra_state { - pgoff_t start; /* where readahead started */ - unsigned int size; /* # of readahead pages */ - unsigned int async_size; /* do asynchronous readahead when - there are only # of pages ahead */ - - unsigned int ra_pages; /* Maximum readahead window */ - unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ - loff_t prev_pos; /* Cache last read() position */ + pgoff_t start; + unsigned int size; + unsigned int async_size; + unsigned int ra_pages; + unsigned int mmap_miss; + loff_t prev_pos; }; /* @@ -1574,52 +1577,172 @@ static inline void i_gid_write(struct inode *inode, gid_t gid) inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid); } +/** + * kuid_into_mnt - map a kuid down into a mnt_userns + * @mnt_userns: user namespace of the relevant mount + * @kuid: kuid to be mapped + * + * Return: @kuid mapped according to @mnt_userns. + * If @kuid has no mapping INVALID_UID is returned. + */ static inline kuid_t kuid_into_mnt(struct user_namespace *mnt_userns, kuid_t kuid) { return make_kuid(mnt_userns, __kuid_val(kuid)); } +/** + * kgid_into_mnt - map a kgid down into a mnt_userns + * @mnt_userns: user namespace of the relevant mount + * @kgid: kgid to be mapped + * + * Return: @kgid mapped according to @mnt_userns. + * If @kgid has no mapping INVALID_GID is returned. + */ static inline kgid_t kgid_into_mnt(struct user_namespace *mnt_userns, kgid_t kgid) { return make_kgid(mnt_userns, __kgid_val(kgid)); } +/** + * i_uid_into_mnt - map an inode's i_uid down into a mnt_userns + * @mnt_userns: user namespace of the mount the inode was found from + * @inode: inode to map + * + * Return: the inode's i_uid mapped down according to @mnt_userns. + * If the inode's i_uid has no mapping INVALID_UID is returned. + */ static inline kuid_t i_uid_into_mnt(struct user_namespace *mnt_userns, const struct inode *inode) { return kuid_into_mnt(mnt_userns, inode->i_uid); } +/** + * i_gid_into_mnt - map an inode's i_gid down into a mnt_userns + * @mnt_userns: user namespace of the mount the inode was found from + * @inode: inode to map + * + * Return: the inode's i_gid mapped down according to @mnt_userns. + * If the inode's i_gid has no mapping INVALID_GID is returned. + */ static inline kgid_t i_gid_into_mnt(struct user_namespace *mnt_userns, const struct inode *inode) { return kgid_into_mnt(mnt_userns, inode->i_gid); } +/** + * kuid_from_mnt - map a kuid up into a mnt_userns + * @mnt_userns: user namespace of the relevant mount + * @kuid: kuid to be mapped + * + * Return: @kuid mapped up according to @mnt_userns. + * If @kuid has no mapping INVALID_UID is returned. + */ static inline kuid_t kuid_from_mnt(struct user_namespace *mnt_userns, kuid_t kuid) { return KUIDT_INIT(from_kuid(mnt_userns, kuid)); } +/** + * kgid_from_mnt - map a kgid up into a mnt_userns + * @mnt_userns: user namespace of the relevant mount + * @kgid: kgid to be mapped + * + * Return: @kgid mapped up according to @mnt_userns. + * If @kgid has no mapping INVALID_GID is returned. + */ static inline kgid_t kgid_from_mnt(struct user_namespace *mnt_userns, kgid_t kgid) { return KGIDT_INIT(from_kgid(mnt_userns, kgid)); } -static inline kuid_t fsuid_into_mnt(struct user_namespace *mnt_userns) +/** + * mapped_fsuid - return caller's fsuid mapped up into a mnt_userns + * @mnt_userns: user namespace of the relevant mount + * + * Use this helper to initialize a new vfs or filesystem object based on + * the caller's fsuid. A common example is initializing the i_uid field of + * a newly allocated inode triggered by a creation event such as mkdir or + * O_CREAT. Other examples include the allocation of quotas for a specific + * user. + * + * Return: the caller's current fsuid mapped up according to @mnt_userns. + */ +static inline kuid_t mapped_fsuid(struct user_namespace *mnt_userns) { return kuid_from_mnt(mnt_userns, current_fsuid()); } -static inline kgid_t fsgid_into_mnt(struct user_namespace *mnt_userns) +/** + * mapped_fsgid - return caller's fsgid mapped up into a mnt_userns + * @mnt_userns: user namespace of the relevant mount + * + * Use this helper to initialize a new vfs or filesystem object based on + * the caller's fsgid. A common example is initializing the i_gid field of + * a newly allocated inode triggered by a creation event such as mkdir or + * O_CREAT. Other examples include the allocation of quotas for a specific + * user. + * + * Return: the caller's current fsgid mapped up according to @mnt_userns. + */ +static inline kgid_t mapped_fsgid(struct user_namespace *mnt_userns) { return kgid_from_mnt(mnt_userns, current_fsgid()); } +/** + * inode_fsuid_set - initialize inode's i_uid field with callers fsuid + * @inode: inode to initialize + * @mnt_userns: user namespace of the mount the inode was found from + * + * Initialize the i_uid field of @inode. If the inode was found/created via + * an idmapped mount map the caller's fsuid according to @mnt_users. + */ +static inline void inode_fsuid_set(struct inode *inode, + struct user_namespace *mnt_userns) +{ + inode->i_uid = mapped_fsuid(mnt_userns); +} + +/** + * inode_fsgid_set - initialize inode's i_gid field with callers fsgid + * @inode: inode to initialize + * @mnt_userns: user namespace of the mount the inode was found from + * + * Initialize the i_gid field of @inode. If the inode was found/created via + * an idmapped mount map the caller's fsgid according to @mnt_users. + */ +static inline void inode_fsgid_set(struct inode *inode, + struct user_namespace *mnt_userns) +{ + inode->i_gid = mapped_fsgid(mnt_userns); +} + +/** + * fsuidgid_has_mapping() - check whether caller's fsuid/fsgid is mapped + * @sb: the superblock we want a mapping in + * @mnt_userns: user namespace of the relevant mount + * + * Check whether the caller's fsuid and fsgid have a valid mapping in the + * s_user_ns of the superblock @sb. If the caller is on an idmapped mount map + * the caller's fsuid and fsgid according to the @mnt_userns first. + * + * Return: true if fsuid and fsgid is mapped, false if not. + */ +static inline bool fsuidgid_has_mapping(struct super_block *sb, + struct user_namespace *mnt_userns) +{ + struct user_namespace *s_user_ns = sb->s_user_ns; + + return kuid_has_mapping(s_user_ns, mapped_fsuid(mnt_userns)) && + kgid_has_mapping(s_user_ns, mapped_fsgid(mnt_userns)); +} + extern struct timespec64 current_time(struct inode *inode); /* @@ -1739,7 +1862,7 @@ static inline void sb_start_pagefault(struct super_block *sb) __sb_start_write(sb, SB_FREEZE_PAGEFAULT); } -/* +/** * sb_start_intwrite - get write access to a superblock for internal fs purposes * @sb: the super we write to * @@ -1782,6 +1905,17 @@ int vfs_rmdir(struct user_namespace *, struct inode *, struct dentry *); int vfs_unlink(struct user_namespace *, struct inode *, struct dentry *, struct inode **); +/** + * struct renamedata - contains all information required for renaming + * @old_mnt_userns: old user namespace of the mount the inode was found from + * @old_dir: parent of source + * @old_dentry: source + * @new_mnt_userns: new user namespace of the mount the inode was found from + * @new_dir: parent of destination + * @new_dentry: destination + * @delegated_inode: returns an inode needing a delegation break + * @flags: rename flags + */ struct renamedata { struct user_namespace *old_mnt_userns; struct inode *old_dir; @@ -1963,6 +2097,9 @@ struct inode_operations { struct dentry *, umode_t); int (*set_acl)(struct user_namespace *, struct inode *, struct posix_acl *, int); + int (*fileattr_set)(struct user_namespace *mnt_userns, + struct dentry *dentry, struct fileattr *fa); + int (*fileattr_get)(struct dentry *dentry, struct fileattr *fa); } ____cacheline_aligned; static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio, @@ -2739,6 +2876,8 @@ static inline int filemap_fdatawait(struct address_space *mapping) extern bool filemap_range_has_page(struct address_space *, loff_t lstart, loff_t lend); +extern bool filemap_range_needs_writeback(struct address_space *, + loff_t lstart, loff_t lend); extern int filemap_write_and_wait_range(struct address_space *mapping, loff_t lstart, loff_t lend); extern int __filemap_fdatawrite_range(struct address_space *mapping, @@ -2884,6 +3023,11 @@ static inline bool execute_ok(struct inode *inode) return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); } +static inline bool inode_wrong_type(const struct inode *inode, umode_t mode) +{ + return (inode->i_mode ^ mode) & S_IFMT; +} + static inline void file_start_write(struct file *file) { if (!S_ISREG(file_inode(file)->i_mode)) @@ -3161,7 +3305,7 @@ static inline ssize_t blockdev_direct_IO(struct kiocb *iocb, void inode_dio_wait(struct inode *inode); -/* +/** * inode_dio_begin - signal start of a direct I/O requests * @inode: inode the direct I/O happens on * @@ -3173,7 +3317,7 @@ static inline void inode_dio_begin(struct inode *inode) atomic_inc(&inode->i_dio_count); } -/* +/** * inode_dio_end - signal finish of a direct I/O requests * @inode: inode the direct I/O happens on * @@ -3567,18 +3711,6 @@ extern int vfs_fadvise(struct file *file, loff_t offset, loff_t len, extern int generic_fadvise(struct file *file, loff_t offset, loff_t len, int advice); -int vfs_ioc_setflags_prepare(struct inode *inode, unsigned int oldflags, - unsigned int flags); - -int vfs_ioc_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa, - struct fsxattr *fa); - -static inline void simple_fill_fsxattr(struct fsxattr *fa, __u32 xflags) -{ - memset(fa, 0, sizeof(*fa)); - fa->fsx_xflags = xflags; -} - /* * Flush file data before changing attributes. Caller must hold any locks * required to prevent further writes to this file until we're done setting |