Function report |
Source Code:fs\namei.c |
Create Date:2022-07-28 20:05:12 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Name:Look up and maybe create and open the last component
Proto:static int lookup_open(struct nameidata *nd, struct path *path, struct file *file, const struct open_flags *op, bool got_write)
Type:int
Parameter:
Type | Parameter | Name |
---|---|---|
struct nameidata * | nd | |
struct path * | path | |
struct file * | file | |
const struct open_flags * | op | |
bool | got_write |
3080 | create_error = 0 |
3084 | If Value for the false possibility is greater at compile time(IS_DEADDIR(dir_inode)) Then Return -ENOENT |
3087 | f_mode &= ~FMODE_CREATED |
3088 | dentry = search for a dentry |
3089 | cycle |
3090 | If Not dentry Then |
3091 | dentry = d_alloc_parallel(dir, & last, & wq) |
3095 | If d_in_lookup(dentry) Then Break |
3098 | error = d_revalidate(dentry, flags) |
3099 | If Value is more likely to compile time(error > 0) Then Break |
3103 | invalidate a dentry |
3105 | dentry = NULL |
3107 | If Where the name belongs to - NULL is * negative Then |
3109 | Go to out_no_open |
3122 | If Not IS_POSIXACL( Where the name belongs to - NULL is * negative ) Then mode &= ~current_umask() |
3125 | create_error = -EROFS |
3130 | Else |
3131 | create_error = may_o_create( & path, dentry, mode) |
3132 | If create_error Then |
3144 | Go to no_open |
3147 | If atomic_open Then |
3150 | If Value for the false possibility is greater at compile time(error == - ENOENT) && create_error Then error = create_error |
3152 | Return error |
3155 | no_open : |
3156 | If d_in_lookup(dentry) Then |
3159 | d_lookup_done(dentry) |
3171 | If Not Where the name belongs to - NULL is * negative && open_flag & O_CREAT Then |
3172 | f_mode |= FMODE_CREATED |
3174 | If Not create Then |
3185 | error = create_error |
3186 | Go to out_dput |
3188 | out_no_open : |
3191 | Return 0 |
3193 | out_dput : |
3195 | Return error |
Name | Describe |
---|---|
do_last | Handle the last step of open() |
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