user/sven/linux.git/fs/sysfs/sysfs.h, branch v3.4.99

Revert "sysfs: Kill nlink counting."

2012-03-08T21:03:10Z

This reverts commit 524b6c5b39b931311dfe5a2f5abae2f5c9731676. It has shown to break userspace tools, which is not acceptable. Reported-by: Jiri Slaby Cc: Eric W. Biederman Cc: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

sysfs: Kill nlink counting.

2012-01-24T20:41:46Z

Tracking the number of subdirectories requires an extra field that increases the size of sysfs_dirent. nlinks are not particularly interesting for sysfs and the nlink counts are wrong when network namespaces are involved so stop counting them, and always return nlink == 1. Userspace already knows that directories with nlink == 1 have an nlink count they can't use to count subdirectories. This reduces the size of sysfs_dirent by 8 bytes on 64bit platforms. Signed-off-by: Eric W. Biederman Signed-off-by: Greg Kroah-Hartman

sysfs: Store the sysfs inode in an unsigned int.

2012-01-24T20:41:46Z

Store the sysfs inode number in an unsided int because ida inode allocator can return at most a 31 bit number, reducing the size of struct sysfs_dirent by 8 bytes on 64bit platforms. Signed-off-by: Eric W. Biederman Signed-off-by: Greg Kroah-Hartman

sysfs: Reduce s_flags to an unsinged short so it packs well with s_mode

2012-01-24T20:41:00Z

On 32bit this reduces sizeof(struct sysfs_dirent) by 2 bytes. Signed-off-by: Eric W. Biederman Signed-off-by: Greg Kroah-Hartman

sysfs: Add s_hash to sysfs_dirent and order directory entries by hash

2012-01-24T20:36:17Z

Compute a 31 bit hash of directory entries (that can fit in a signed 32bit off_t) and index the sysfs directory entries by that hash, replacing the per directory indexes by name and by inode. Because we now only use a single rbtree this reduces the size of sysfs_dirent by 2 pointers. Because we have fewer cases to deal with the code is now simpler. For now I use the simple hash that the dcache uses as that is easy to use and seems simple enough. In addition to makeing the code simpler using a hash for the file position in readdir brings sysfs in line with other filesystems that have non-trivial directory structures. Signed-off-by: Eric W. Biederman Signed-off-by: Greg Kroah-Hartman

sysfs: propagate umode_t

2012-01-04T03:55:03Z

Signed-off-by: Al Viro

sysfs: use rb-tree for inode number lookup

2011-08-23T00:43:53Z

sysfs: use rb-tree for inode number lookup This patch makes sysfs use red-black tree for inode number lookup. Together with a previous patch to use red-black tree for name lookup, this patch makes all sysfs lookups to have O(log n) complexity. Signed-off-by: Mikulas Patocka Signed-off-by: Greg Kroah-Hartman

sysfs: remove s_sibling hacks

2011-08-23T00:43:52Z

sysfs: remove s_sibling hacks s_sibling was used for three different purposes: 1) as a linked list of entries in the directory 2) as a linked list of entries to be deleted 3) as a pointer to "struct completion" This patch removes the hack and introduces new union u which holds pointers for cases 2) and 3). This change is needed for the following patch that removes s_sibling at all and replaces it with a rb tree. Signed-off-by: Mikulas Patocka Signed-off-by: Greg Kroah-Hartman

sysfs: use rb-tree for name lookups

2011-08-23T00:43:52Z

sysfs: use rb-tree for name lookups Use red-black tree for name lookups. Signed-off-by: Mikulas Patocka Signed-off-by: Greg Kroah-Hartman

sysfs: count subdirectories

2011-08-23T00:43:30Z

sysfs: count subdirectories This patch introduces a subdirectory counter for each sysfs directory. Without the patch, sysfs_refresh_inode would walk all entries of the directory to calculate the number of subdirectories. This patch improves time of "ls -la /sys/block" when there are 10000 block devices from 9 seconds to 0.19 seconds. Signed-off-by: Mikulas Patocka Signed-off-by: Greg Kroah-Hartman