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author | Miklos Szeredi <mszeredi@redhat.com> | 2017-11-10 09:39:15 +0100 |
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committer | Miklos Szeredi <mszeredi@redhat.com> | 2017-11-10 09:39:15 +0100 |
commit | a9075cdb467dd3b01b57f8786e6ea1eca05a76b4 (patch) | |
tree | d939913fbea1fd00d9b3fcc91e84ca17bf823cd8 /fs | |
parent | 95e6d4177cb7a2d7a760180e13f32adaf4188833 (diff) | |
download | linux-a9075cdb467dd3b01b57f8786e6ea1eca05a76b4.tar.bz2 |
ovl: factor out ovl_free_fs() helper
This can be called both from ovl_put_super() and in the error cleanup path
from ovl_fill_super().
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/overlayfs/super.c | 72 |
1 files changed, 27 insertions, 45 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 255c0523148f..5a5b41c542fb 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -206,9 +206,8 @@ static void ovl_destroy_inode(struct inode *inode) call_rcu(&inode->i_rcu, ovl_i_callback); } -static void ovl_put_super(struct super_block *sb) +static void ovl_free_fs(struct ovl_fs *ufs) { - struct ovl_fs *ufs = sb->s_fs_info; unsigned i; dput(ufs->indexdir); @@ -216,7 +215,7 @@ static void ovl_put_super(struct super_block *sb) if (ufs->workdir_locked) ovl_inuse_unlock(ufs->workbasedir); dput(ufs->workbasedir); - if (ufs->upper_mnt && ufs->upperdir_locked) + if (ufs->upperdir_locked) ovl_inuse_unlock(ufs->upper_mnt->mnt_root); mntput(ufs->upper_mnt); for (i = 0; i < ufs->numlower; i++) { @@ -228,10 +227,18 @@ static void ovl_put_super(struct super_block *sb) kfree(ufs->config.lowerdir); kfree(ufs->config.upperdir); kfree(ufs->config.workdir); - put_cred(ufs->creator_cred); + if (ufs->creator_cred) + put_cred(ufs->creator_cred); kfree(ufs); } +static void ovl_put_super(struct super_block *sb) +{ + struct ovl_fs *ofs = sb->s_fs_info; + + ovl_free_fs(ofs); +} + static int ovl_sync_fs(struct super_block *sb, int wait) { struct ovl_fs *ufs = sb->s_fs_info; @@ -1131,7 +1138,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) struct path upperpath = { }; struct path workpath = { }; struct dentry *root_dentry; - struct ovl_entry *oe; + struct ovl_entry *oe = NULL; struct ovl_fs *ufs; struct path *stack = NULL; unsigned int numlower = 0; @@ -1148,13 +1155,13 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) ufs->config.index = ovl_index_def; err = ovl_parse_opt((char *) data, &ufs->config); if (err) - goto out_free_config; + goto out_err; err = -EINVAL; if (!ufs->config.lowerdir) { if (!silent) pr_err("overlayfs: missing 'lowerdir'\n"); - goto out_free_config; + goto out_err; } sb->s_stack_depth = 0; @@ -1162,38 +1169,38 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) if (ufs->config.upperdir) { if (!ufs->config.workdir) { pr_err("overlayfs: missing 'workdir'\n"); - goto out_free_config; + goto out_err; } err = ovl_get_upperpath(ufs, &upperpath); if (err) - goto out_unlock_upperdentry; + goto out_err; err = ovl_get_workpath(ufs, &upperpath, &workpath); if (err) - goto out_unlock_workdentry; + goto out_err; sb->s_stack_depth = upperpath.mnt->mnt_sb->s_stack_depth; } err = ovl_get_lowerstack(sb, ufs, &stack, &numlower); if (err) - goto out_unlock_workdentry; + goto out_err; if (ufs->config.upperdir) { err = ovl_get_upper(ufs, &upperpath); if (err) - goto out_put_lowerpath; + goto out_err; sb->s_time_gran = ufs->upper_mnt->mnt_sb->s_time_gran; err = ovl_get_workdir(sb, ufs, &workpath); if (err) - goto out_put_workdir; + goto out_err; } err = ovl_get_lower_layers(ufs, stack, numlower); if (err) - goto out_put_lower_layers; + goto out_err; /* If the upper fs is nonexistent, we mark overlayfs r/o too */ if (!ufs->upper_mnt) @@ -1204,7 +1211,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) err = -ENOMEM; oe = ovl_alloc_entry(numlower); if (!oe) - goto out_put_lower_layers; + goto out_err; for (i = 0; i < numlower; i++) { oe->lowerstack[i].dentry = stack[i].dentry; @@ -1214,7 +1221,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) if (!(ovl_force_readonly(ufs)) && ufs->config.index) { err = ovl_get_indexdir(sb, ufs, oe, &upperpath); if (err) - goto out_put_indexdir; + goto out_err; } /* Show index=off/on in /proc/mounts for any of the reasons above */ @@ -1224,7 +1231,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) err = -ENOMEM; ufs->creator_cred = cred = prepare_creds(); if (!cred) - goto out_put_indexdir; + goto out_err; /* Never override disk quota limits or use reserved space */ cap_lower(cred->cap_effective, CAP_SYS_RESOURCE); @@ -1237,7 +1244,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) root_dentry = d_make_root(ovl_new_inode(sb, S_IFDIR, 0)); if (!root_dentry) - goto out_put_cred; + goto out_err; mntput(upperpath.mnt); for (i = 0; i < numlower; i++) @@ -1262,39 +1269,14 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) return 0; -out_put_cred: - put_cred(ufs->creator_cred); -out_put_indexdir: - dput(ufs->indexdir); +out_err: kfree(oe); -out_put_lower_layers: - for (i = 0; i < ufs->numlower; i++) { - if (ufs->lower_layers[i].mnt) - free_anon_bdev(ufs->lower_layers[i].pseudo_dev); - mntput(ufs->lower_layers[i].mnt); - } - kfree(ufs->lower_layers); -out_put_workdir: - dput(ufs->workdir); - mntput(ufs->upper_mnt); -out_put_lowerpath: for (i = 0; i < numlower; i++) path_put(&stack[i]); kfree(stack); -out_unlock_workdentry: - if (ufs->workdir_locked) - ovl_inuse_unlock(ufs->workbasedir); - dput(ufs->workbasedir); path_put(&workpath); -out_unlock_upperdentry: - if (ufs->upperdir_locked) - ovl_inuse_unlock(upperpath.dentry); path_put(&upperpath); -out_free_config: - kfree(ufs->config.lowerdir); - kfree(ufs->config.upperdir); - kfree(ufs->config.workdir); - kfree(ufs); + ovl_free_fs(ufs); out: return err; } |