__sb_start_write

Name:This is an internal function, please use sb_start_{write,pagefault,intwrite}* instead.

Proto:int __sb_start_write(struct super_block *sb, int level, bool wait)

Type:int

Parameter:

Type	Parameter	Name
struct super_block *	sb
int	level
bool	wait

1650

bool force_trylock = false

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ret = 1

1673

If wait && Not force_trylock Then percpu_down_read(rw_sem + level - 1)

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Else ret = percpu_down_read_trylock(rw_sem + level - 1)

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WARN_ON(force_trylock && !ret)

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Return ret

**Caller**
Name	Describe
aio_write
io_write
sb_start_write	sb_start_write - get write access to a superblock@sb: the super we write to When a process wants to write data or metadata to a file system (i.e. dirty* a page or an inode), it should embed the operation in a sb_start_write() -
sb_start_write_trylock
sb_start_pagefault	sb_start_pagefault - get write access to a superblock from a page fault@sb: the super we write to When a process starts handling write page fault, it should embed the* operation into sb_start_pagefault() - sb_end_pagefault() pair to get
sb_start_intwrite	sb_start_intwrite - get write access to a superblock for internal fs purposes@sb: the super we write to This is the third level of protection against filesystem freezing. It is* free for use by a filesystem. The only requirement is that it must rank
sb_start_intwrite_trylock
file_start_write
file_start_write_trylock

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