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proc_fill_cache(): just make instantiate_t return int 

all instances always return ERR_PTR(-E...) or NULL, anyway

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-06-15 11:15:20 +04:00
parent db96316487
commit c52a47ace7
4 changed files with 43 additions and 49 deletions
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59
fs/proc/base.c
View File

@ -1700,7 +1700,7 @@ bool proc_fill_cache(struct file *file, struct dir_context *ctx,
struct dentry *new; struct dentry *new;
new = d_alloc(dir, &qname); new = d_alloc(dir, &qname);
if (new) { if (new) {
child = instantiate(dir->d_inode, new, task, ptr); child = ERR_PTR(instantiate(dir->d_inode, new, task, ptr));
if (child) if (child)
dput(new); dput(new);
else else
@ -1844,7 +1844,7 @@ struct map_files_info {
unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */ unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
}; };
static struct dentry * static int
proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
struct task_struct *task, const void *ptr) struct task_struct *task, const void *ptr)
{ {
@ -1854,7 +1854,7 @@ proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
inode = proc_pid_make_inode(dir->i_sb, task); inode = proc_pid_make_inode(dir->i_sb, task);
if (!inode) if (!inode)
return ERR_PTR(-ENOENT); return -ENOENT;
ei = PROC_I(inode); ei = PROC_I(inode);
ei->op.proc_get_link = proc_map_files_get_link; ei->op.proc_get_link = proc_map_files_get_link;
@ -1871,7 +1871,7 @@ proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
d_set_d_op(dentry, &tid_map_files_dentry_operations); d_set_d_op(dentry, &tid_map_files_dentry_operations);
d_add(dentry, inode); d_add(dentry, inode);
return NULL; return 0;
} }
static struct dentry *proc_map_files_lookup(struct inode *dir, static struct dentry *proc_map_files_lookup(struct inode *dir,
@ -1880,23 +1880,23 @@ static struct dentry *proc_map_files_lookup(struct inode *dir,
unsigned long vm_start, vm_end; unsigned long vm_start, vm_end;
struct vm_area_struct *vma; struct vm_area_struct *vma;
struct task_struct *task; struct task_struct *task;
struct dentry *result; int result;
struct mm_struct *mm; struct mm_struct *mm;
result = ERR_PTR(-EPERM); result = -EPERM;
if (!capable(CAP_SYS_ADMIN)) if (!capable(CAP_SYS_ADMIN))
goto out; goto out;
result = ERR_PTR(-ENOENT); result = -ENOENT;
task = get_proc_task(dir); task = get_proc_task(dir);
if (!task) if (!task)
goto out; goto out;
result = ERR_PTR(-EACCES); result = -EACCES;
if (!ptrace_may_access(task, PTRACE_MODE_READ)) if (!ptrace_may_access(task, PTRACE_MODE_READ))
goto out_put_task; goto out_put_task;
result = ERR_PTR(-ENOENT); result = -ENOENT;
if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
goto out_put_task; goto out_put_task;
@ -1919,7 +1919,7 @@ out_no_vma:
out_put_task: out_put_task:
put_task_struct(task); put_task_struct(task);
out: out:
return result; return ERR_PTR(result);
} }
static const struct inode_operations proc_map_files_inode_operations = { static const struct inode_operations proc_map_files_inode_operations = {
@ -2133,13 +2133,12 @@ static const struct file_operations proc_timers_operations = {
}; };
#endif /* CONFIG_CHECKPOINT_RESTORE */ #endif /* CONFIG_CHECKPOINT_RESTORE */
static struct dentry *proc_pident_instantiate(struct inode *dir, static int proc_pident_instantiate(struct inode *dir,
struct dentry *dentry, struct task_struct *task, const void *ptr) struct dentry *dentry, struct task_struct *task, const void *ptr)
{ {
const struct pid_entry *p = ptr; const struct pid_entry *p = ptr;
struct inode *inode; struct inode *inode;
struct proc_inode *ei; struct proc_inode *ei;
struct dentry *error = ERR_PTR(-ENOENT);
inode = proc_pid_make_inode(dir->i_sb, task); inode = proc_pid_make_inode(dir->i_sb, task);
if (!inode) if (!inode)
@ -2158,9 +2157,9 @@ static struct dentry *proc_pident_instantiate(struct inode *dir,
d_add(dentry, inode); d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */ /* Close the race of the process dying before we return the dentry */
if (pid_revalidate(dentry, 0)) if (pid_revalidate(dentry, 0))
error = NULL; return 0;
out: out:
return error; return -ENOENT;
} }
static struct dentry *proc_pident_lookup(struct inode *dir, static struct dentry *proc_pident_lookup(struct inode *dir,
@ -2168,11 +2167,11 @@ static struct dentry *proc_pident_lookup(struct inode *dir,
const struct pid_entry *ents, const struct pid_entry *ents,
unsigned int nents) unsigned int nents)
{ {
struct dentry *error; int error;
struct task_struct *task = get_proc_task(dir); struct task_struct *task = get_proc_task(dir);
const struct pid_entry *p, *last; const struct pid_entry *p, *last;
error = ERR_PTR(-ENOENT); error = -ENOENT;
if (!task) if (!task)
goto out_no_task; goto out_no_task;
@ -2195,7 +2194,7 @@ static struct dentry *proc_pident_lookup(struct inode *dir,
out: out:
put_task_struct(task); put_task_struct(task);
out_no_task: out_no_task:
return error; return ERR_PTR(error);
} }
static int proc_pident_readdir(struct file *file, struct dir_context *ctx, static int proc_pident_readdir(struct file *file, struct dir_context *ctx,
@ -2778,11 +2777,10 @@ void proc_flush_task(struct task_struct *task)
} }
} }
static struct dentry *proc_pid_instantiate(struct inode *dir, static int proc_pid_instantiate(struct inode *dir,
struct dentry * dentry, struct dentry * dentry,
struct task_struct *task, const void *ptr) struct task_struct *task, const void *ptr)
{ {
struct dentry *error = ERR_PTR(-ENOENT);
struct inode *inode; struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task); inode = proc_pid_make_inode(dir->i_sb, task);
@ -2802,14 +2800,14 @@ static struct dentry *proc_pid_instantiate(struct inode *dir,
d_add(dentry, inode); d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */ /* Close the race of the process dying before we return the dentry */
if (pid_revalidate(dentry, 0)) if (pid_revalidate(dentry, 0))
error = NULL; return 0;
out: out:
return error; return -ENOENT;
} }
struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
{ {
struct dentry *result = NULL; int result = 0;
struct task_struct *task; struct task_struct *task;
unsigned tgid; unsigned tgid;
struct pid_namespace *ns; struct pid_namespace *ns;
@ -2830,7 +2828,7 @@ struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsign
result = proc_pid_instantiate(dir, dentry, task, NULL); result = proc_pid_instantiate(dir, dentry, task, NULL);
put_task_struct(task); put_task_struct(task);
out: out:
return result; return ERR_PTR(result);
} }
/* /*
@ -3025,10 +3023,9 @@ static const struct inode_operations proc_tid_base_inode_operations = {
.setattr = proc_setattr, .setattr = proc_setattr,
}; };
static struct dentry *proc_task_instantiate(struct inode *dir, static int proc_task_instantiate(struct inode *dir,
struct dentry *dentry, struct task_struct *task, const void *ptr) struct dentry *dentry, struct task_struct *task, const void *ptr)
{ {
struct dentry *error = ERR_PTR(-ENOENT);
struct inode *inode; struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task); inode = proc_pid_make_inode(dir->i_sb, task);
@ -3047,14 +3044,14 @@ static struct dentry *proc_task_instantiate(struct inode *dir,
d_add(dentry, inode); d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */ /* Close the race of the process dying before we return the dentry */
if (pid_revalidate(dentry, 0)) if (pid_revalidate(dentry, 0))
error = NULL; return 0;
out: out:
return error; return -ENOENT;
} }
static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
{ {
struct dentry *result = ERR_PTR(-ENOENT); int result = -ENOENT;
struct task_struct *task; struct task_struct *task;
struct task_struct *leader = get_proc_task(dir); struct task_struct *leader = get_proc_task(dir);
unsigned tid; unsigned tid;
@ -3084,7 +3081,7 @@ out_drop_task:
out: out:
put_task_struct(leader); put_task_struct(leader);
out_no_task: out_no_task:
return result; return ERR_PTR(result);
} }
/* /*

18
fs/proc/fd.c
View File

@ -167,11 +167,10 @@ static int proc_fd_link(struct dentry *dentry, struct path *path)
return ret; return ret;
} }
static struct dentry * static int
proc_fd_instantiate(struct inode *dir, struct dentry *dentry, proc_fd_instantiate(struct inode *dir, struct dentry *dentry,
struct task_struct *task, const void *ptr) struct task_struct *task, const void *ptr)
{ {
struct dentry *error = ERR_PTR(-ENOENT);
unsigned fd = (unsigned long)ptr; unsigned fd = (unsigned long)ptr;
struct proc_inode *ei; struct proc_inode *ei;
struct inode *inode; struct inode *inode;
@ -194,9 +193,9 @@ proc_fd_instantiate(struct inode *dir, struct dentry *dentry,
/* Close the race of the process dying before we return the dentry */ /* Close the race of the process dying before we return the dentry */
if (tid_fd_revalidate(dentry, 0)) if (tid_fd_revalidate(dentry, 0))
error = NULL; return 0;
out: out:
return error; return -ENOENT;
} }
static struct dentry *proc_lookupfd_common(struct inode *dir, static struct dentry *proc_lookupfd_common(struct inode *dir,
@ -204,7 +203,7 @@ static struct dentry *proc_lookupfd_common(struct inode *dir,
instantiate_t instantiate) instantiate_t instantiate)
{ {
struct task_struct *task = get_proc_task(dir); struct task_struct *task = get_proc_task(dir);
struct dentry *result = ERR_PTR(-ENOENT); int result = -ENOENT;
unsigned fd = name_to_int(dentry); unsigned fd = name_to_int(dentry);
if (!task) if (!task)
@ -216,7 +215,7 @@ static struct dentry *proc_lookupfd_common(struct inode *dir,
out: out:
put_task_struct(task); put_task_struct(task);
out_no_task: out_no_task:
return result; return ERR_PTR(result);
} }
static int proc_readfd_common(struct file *file, struct dir_context *ctx, static int proc_readfd_common(struct file *file, struct dir_context *ctx,
@ -300,11 +299,10 @@ const struct inode_operations proc_fd_inode_operations = {
.setattr = proc_setattr, .setattr = proc_setattr,
}; };
static struct dentry * static int
proc_fdinfo_instantiate(struct inode *dir, struct dentry *dentry, proc_fdinfo_instantiate(struct inode *dir, struct dentry *dentry,
struct task_struct *task, const void *ptr) struct task_struct *task, const void *ptr)
{ {
struct dentry *error = ERR_PTR(-ENOENT);
unsigned fd = (unsigned long)ptr; unsigned fd = (unsigned long)ptr;
struct proc_inode *ei; struct proc_inode *ei;
struct inode *inode; struct inode *inode;
@ -324,9 +322,9 @@ proc_fdinfo_instantiate(struct inode *dir, struct dentry *dentry,
/* Close the race of the process dying before we return the dentry */ /* Close the race of the process dying before we return the dentry */
if (tid_fd_revalidate(dentry, 0)) if (tid_fd_revalidate(dentry, 0))
error = NULL; return 0;
out: out:
return error; return -ENOENT;
} }
static struct dentry * static struct dentry *

2
fs/proc/internal.h
View File

@ -170,7 +170,7 @@ extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned
extern loff_t mem_lseek(struct file *, loff_t, int); extern loff_t mem_lseek(struct file *, loff_t, int);
/* Lookups */ /* Lookups */
typedef struct dentry *instantiate_t(struct inode *, struct dentry *, typedef int instantiate_t(struct inode *, struct dentry *,
struct task_struct *, const void *); struct task_struct *, const void *);
extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int, extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int,
instantiate_t, struct task_struct *, const void *); instantiate_t, struct task_struct *, const void *);

13
fs/proc/namespaces.c
View File

@ -187,13 +187,12 @@ static const struct inode_operations proc_ns_link_inode_operations = {
.setattr = proc_setattr, .setattr = proc_setattr,
}; };
static struct dentry *proc_ns_instantiate(struct inode *dir, static int proc_ns_instantiate(struct inode *dir,
struct dentry *dentry, struct task_struct *task, const void *ptr) struct dentry *dentry, struct task_struct *task, const void *ptr)
{ {
const struct proc_ns_operations *ns_ops = ptr; const struct proc_ns_operations *ns_ops = ptr;
struct inode *inode; struct inode *inode;
struct proc_inode *ei; struct proc_inode *ei;
struct dentry *error = ERR_PTR(-ENOENT);
inode = proc_pid_make_inode(dir->i_sb, task); inode = proc_pid_make_inode(dir->i_sb, task);
if (!inode) if (!inode)
@ -208,9 +207,9 @@ static struct dentry *proc_ns_instantiate(struct inode *dir,
d_add(dentry, inode); d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */ /* Close the race of the process dying before we return the dentry */
if (pid_revalidate(dentry, 0)) if (pid_revalidate(dentry, 0))
error = NULL; return 0;
out: out:
return error; return -ENOENT;
} }
static int proc_ns_dir_readdir(struct file *file, struct dir_context *ctx) static int proc_ns_dir_readdir(struct file *file, struct dir_context *ctx)
@ -248,12 +247,12 @@ const struct file_operations proc_ns_dir_operations = {
static struct dentry *proc_ns_dir_lookup(struct inode *dir, static struct dentry *proc_ns_dir_lookup(struct inode *dir,
struct dentry *dentry, unsigned int flags) struct dentry *dentry, unsigned int flags)
{ {
struct dentry *error; int error;
struct task_struct *task = get_proc_task(dir); struct task_struct *task = get_proc_task(dir);
const struct proc_ns_operations **entry, **last; const struct proc_ns_operations **entry, **last;
unsigned int len = dentry->d_name.len; unsigned int len = dentry->d_name.len;
error = ERR_PTR(-ENOENT); error = -ENOENT;
if (!task) if (!task)
goto out_no_task; goto out_no_task;
@ -272,7 +271,7 @@ static struct dentry *proc_ns_dir_lookup(struct inode *dir,
out: out:
put_task_struct(task); put_task_struct(task);
out_no_task: out_no_task:
return error; return ERR_PTR(error);
} }
const struct inode_operations proc_ns_dir_inode_operations = { const struct inode_operations proc_ns_dir_inode_operations = {