GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

sysfs, kernfs: add sysfs_dirent->s_attr.size

Browse source 
sysfs sets the size of regular files unconditionally at PAGE_SIZE and
takes the size of bin files from bin_attribute.  The latter is a
pretty bad interface which forces bin_attribute users to create a
separate copy of bin_attribute for each instance of the file -
e.g. pci resource files.

Add sysfs_dirent->s_attr.size so that the size can be specified
separately.  This unifies inode init paths of ATTR and BIN_ATTR
identical and allows for generic size handling for kernfs.

Unfortunately, this grows the size of sysfs_dirent by sizeof(loff_t).

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2013-11-28 14:54:22 -05:00 • committed by Greg Kroah-Hartman
parent f6acf8bb6a
commit 471bd7b78b
3 changed files with 8 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

6
fs/sysfs/file.c
View file

@ -923,6 +923,7 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
const struct kernfs_ops *ops;
struct sysfs_addrm_cxt acxt;
struct sysfs_dirent *sd;
loff_t size;
int rc;
if (type == SYSFS_KOBJ_ATTR) {
@ -943,6 +944,8 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
ops = &sysfs_file_kfops_wo;
else
ops = &sysfs_file_kfops_empty;
size = PAGE_SIZE;
} else {
struct bin_attribute *battr = (void *)attr;
@ -954,6 +957,8 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
ops = &sysfs_bin_kfops_wo;
else
ops = &sysfs_file_kfops_empty;
size = battr->size;
}
sd = sysfs_new_dirent(attr->name, mode, type);
@ -961,6 +966,7 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
return -ENOMEM;
sd->s_attr.ops = ops;
sd->s_attr.size = size;
sd->s_ns = ns;
sd->priv = (void *)attr;
sysfs_dirent_init_lockdep(sd);