函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\dcache.c Create Date:2022-07-29 10:37:28
Last Modify:2020-03-18 10:27:32 Copyright©Brick
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函数名称：dget_parent

函数原型：struct dentry *dget_parent(struct dentry *dentry)

返回类型：struct dentry

参数：

类型参数名称
struct dentry *dentry
912  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
913  seq等于aw_seqcount_begin - begin a seq-read critical section*@s: pointer to seqcount_t* Returns: count to be passed to read_seqcount_retry* raw_seqcount_begin opens a read critical section of the given seqcount
914  ret等于READ_ONCE( parent directory )
915  gotref等于 除非计数为0或死亡
916  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
917  如果此条件成立可能性大(为编译器优化)(gotref)则
918  如果非ad_seqcount_retry - end a seq-read critical section*@s: pointer to seqcount_t*@start: count, from read_seqcount_begin* Returns: 1 if retry is required, else 0* read_seqcount_retry closes a read critical section of the given seqcount则返回:ret
920  dput - release a dentry*@dentry: dentry to release * Release a dentry. This will drop the usage count and if appropriate* call the dentry unlink method as well as removing it from the queues and* releasing its resources
923  repeat :
928  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
929  ret等于 parent directory
930  加自旋锁
931  如果此条件成立可能性小(为编译器优化)(ret != parent directory )则
932  自旋锁解锁
933  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
934  转到:repeat
936  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
937  BUG_ON(!count)
938  count自加
939  自旋锁解锁
940  返回:ret
调用者
名称描述
__fsnotify_parentNotify this dentry's parent about a child's events.
fscrypt_d_revalidateValidate dentries in encrypted directories to make sure we aren't potentially* caching stale dentries after a key has been added.
fscrypt_file_openscrypt_file_open - prepare to open a possibly-encrypted regular file*@inode: the inode being opened*@filp: the struct file being set up* Currently, an encrypted regular file can only be opened if its encryption key