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-rw-r--r--include/linux/fs.h23
1 files changed, 15 insertions, 8 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index a6074cdb7798..e7a633353fd2 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3023,15 +3023,20 @@ static inline void file_end_write(struct file *file)
}
/*
+ * This is used for regular files where some users -- especially the
+ * currently executed binary in a process, previously handled via
+ * VM_DENYWRITE -- cannot handle concurrent write (and maybe mmap
+ * read-write shared) accesses.
+ *
* get_write_access() gets write permission for a file.
* put_write_access() releases this write permission.
- * This is used for regular files.
- * We cannot support write (and maybe mmap read-write shared) accesses and
- * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
- * can have the following values:
- * 0: no writers, no VM_DENYWRITE mappings
- * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
- * > 0: (i_writecount) users are writing to the file.
+ * deny_write_access() denies write access to a file.
+ * allow_write_access() re-enables write access to a file.
+ *
+ * The i_writecount field of an inode can have the following values:
+ * 0: no write access, no denied write access
+ * < 0: (-i_writecount) users that denied write access to the file.
+ * > 0: (i_writecount) users that have write access to the file.
*
* Normally we operate on that counter with atomic_{inc,dec} and it's safe
* except for the cases where we don't hold i_writecount yet. Then we need to
@@ -3434,6 +3439,8 @@ extern int buffer_migrate_page_norefs(struct address_space *,
#define buffer_migrate_page_norefs NULL
#endif
+int may_setattr(struct user_namespace *mnt_userns, struct inode *inode,
+ unsigned int ia_valid);
int setattr_prepare(struct user_namespace *, struct dentry *, struct iattr *);
extern int inode_newsize_ok(const struct inode *, loff_t offset);
void setattr_copy(struct user_namespace *, struct inode *inode,
@@ -3587,7 +3594,7 @@ int proc_nr_dentry(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
int proc_nr_inodes(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
-int __init get_filesystem_list(char *buf);
+int __init list_bdev_fs_names(char *buf, size_t size);
#define __FMODE_EXEC ((__force int) FMODE_EXEC)
#define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)