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| author | Al Viro <viro@zeniv.linux.org.uk> | 2015-11-17 10:20:54 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-12-08 22:41:54 -0500 |
| commit | 6b2553918d8b4e6de9853fd6315bec7271a2e592 (patch) | |
| tree | 85540dcb0dc0de3d67c68d0aa7b17058f4e96539 /fs/ext4/symlink.c | |
| parent | 21fc61c73c3903c4c312d0802da01ec2b323d174 (diff) | |
| download | linux-6b2553918d8b4e6de9853fd6315bec7271a2e592.tar.gz linux-6b2553918d8b4e6de9853fd6315bec7271a2e592.tar.bz2 linux-6b2553918d8b4e6de9853fd6315bec7271a2e592.zip | |
replace ->follow_link() with new method that could stay in RCU mode
new method: ->get_link(); replacement of ->follow_link(). The differences
are:
* inode and dentry are passed separately
* might be called both in RCU and non-RCU mode;
the former is indicated by passing it a NULL dentry.
* when called that way it isn't allowed to block
and should return ERR_PTR(-ECHILD) if it needs to be called
in non-RCU mode.
It's a flagday change - the old method is gone, all in-tree instances
converted. Conversion isn't hard; said that, so far very few instances
do not immediately bail out when called in RCU mode. That'll change
in the next commits.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ext4/symlink.c')
| -rw-r--r-- | fs/ext4/symlink.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c index 0e6dc44c5ebf..3b4bfe2ebd75 100644 --- a/fs/ext4/symlink.c +++ b/fs/ext4/symlink.c @@ -23,17 +23,20 @@ #include "xattr.h" #ifdef CONFIG_EXT4_FS_ENCRYPTION -static const char *ext4_encrypted_follow_link(struct dentry *dentry, void **cookie) +static const char *ext4_encrypted_get_link(struct dentry *dentry, + struct inode *inode, void **cookie) { struct page *cpage = NULL; char *caddr, *paddr = NULL; struct ext4_str cstr, pstr; - struct inode *inode = d_inode(dentry); struct ext4_encrypted_symlink_data *sd; loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1); int res; u32 plen, max_size = inode->i_sb->s_blocksize; + if (!dentry) + return ERR_PTR(-ECHILD); + res = ext4_get_encryption_info(inode); if (res) return ERR_PTR(res); @@ -87,7 +90,7 @@ errout: const struct inode_operations ext4_encrypted_symlink_inode_operations = { .readlink = generic_readlink, - .follow_link = ext4_encrypted_follow_link, + .get_link = ext4_encrypted_get_link, .put_link = kfree_put_link, .setattr = ext4_setattr, .setxattr = generic_setxattr, @@ -99,7 +102,7 @@ const struct inode_operations ext4_encrypted_symlink_inode_operations = { const struct inode_operations ext4_symlink_inode_operations = { .readlink = generic_readlink, - .follow_link = page_follow_link_light, + .get_link = page_get_link, .put_link = page_put_link, .setattr = ext4_setattr, .setxattr = generic_setxattr, @@ -110,7 +113,7 @@ const struct inode_operations ext4_symlink_inode_operations = { const struct inode_operations ext4_fast_symlink_inode_operations = { .readlink = generic_readlink, - .follow_link = simple_follow_link, + .get_link = simple_get_link, .setattr = ext4_setattr, .setxattr = generic_setxattr, .getxattr = generic_getxattr, |